xbp 10.37.0

use crate::cli::auto_commit::{print_push_summary, push_current_branch_with_name};
use crate::commands::service::load_xbp_config_with_root;
use crate::config::{
    resolve_openrouter_api_key, resolve_openrouter_commit_model,
    resolve_openrouter_commit_system_prompt,
};
use crate::openrouter::{complete_prompt_with_options, CompletionOptions};
use crate::utils::command_exists;
use colored::Colorize;
use once_cell::sync::Lazy;
use regex::Regex;
use serde::Deserialize;
use std::collections::{BTreeMap, BTreeSet};
use std::env;
use std::fs;
use std::io::{self, Write as _};
use std::path::{Path, PathBuf};
use tokio::io::{AsyncBufReadExt, AsyncRead, BufReader};
use tokio::process::Command;
use uuid::Uuid;

#[path = "commit_prompt_preprocess.rs"]
mod commit_prompt_preprocess;

use self::commit_prompt_preprocess::{build_prompt_diff_excerpt, prompt_diff_omit_reason};

static RUST_FUNCTION_RE: Lazy<Regex> = Lazy::new(|| {
    Regex::new(r"^\s*(?:pub(?:\([^)]*\))?\s+)?(?:async\s+)?fn\s+([A-Za-z_][A-Za-z0-9_]*)")
        .expect("valid rust function regex")
});
static JS_FUNCTION_RE: Lazy<Regex> = Lazy::new(|| {
    Regex::new(
        r"^\s*(?:export\s+)?(?:default\s+)?(?:async\s+)?function\s+([A-Za-z_$][A-Za-z0-9_$]*)",
    )
    .expect("valid js function regex")
});
static JS_ARROW_RE: Lazy<Regex> = Lazy::new(|| {
    Regex::new(
        r"^\s*(?:export\s+)?(?:const|let|var)\s+([A-Za-z_$][A-Za-z0-9_$]*)\s*=\s*(?:async\s*)?(?:\([^)]*\)|[A-Za-z_$][A-Za-z0-9_$]*)\s*=>",
    )
    .expect("valid js arrow regex")
});
static METHOD_CONTEXT_RE: Lazy<Regex> = Lazy::new(|| {
    Regex::new(r"\b([A-Za-z_][A-Za-z0-9_]*)\s*\(").expect("valid method context regex")
});
static RUST_TYPE_RE: Lazy<Regex> = Lazy::new(|| {
    Regex::new(r"^\s*(?:pub(?:\([^)]*\))?\s+)?(struct|enum|trait|type)\s+([A-Za-z_][A-Za-z0-9_]*)")
        .expect("valid rust type regex")
});
static TS_TYPE_RE: Lazy<Regex> = Lazy::new(|| {
    Regex::new(r"^\s*(?:export\s+)?(interface|type|enum|class)\s+([A-Za-z_$][A-Za-z0-9_$]*)")
        .expect("valid ts type regex")
});

const MAX_PROMPT_FILES: usize = 24;
const MAX_PROMPT_SYMBOLS: usize = 12;
const MAX_PROMPT_CONTEXTS: usize = 12;
const MAX_PROMPT_AREAS: usize = 4;
const MAX_PROMPT_OMITTED_DIFFS: usize = 12;
const MAX_PROMPT_DIFF_SUMMARIES: usize = 16;
const MAX_PRINT_SYMBOLS: usize = 8;
const MAX_PRINT_AREAS: usize = 4;
const MAX_PRINT_FILES: usize = 4;
const CONVENTIONAL_TYPES: &[&str] = &[
    "feat", "fix", "docs", "refactor", "chore", "test", "build", "ci", "perf", "style", "revert",
];
const TERMINAL_SESSION_DIR: &str = "terminals/";
/// Leave headroom under Windows CreateProcess limit (~8191 chars) and common shells.
/// Kept for regression tests after staging switched to bulk `git add --all` only.
#[cfg(test)]
const SAFE_GIT_ARGV_CHAR_BUDGET: usize = 6_000;
/// Prefer bulk `git add --all` once pathspec lists grow past this size.
#[cfg(test)]
const SAFE_GIT_PATHSPEC_COUNT: usize = 64;
const MAX_GIT_ERROR_ARG_CHARS: usize = 240;
const COMMIT_AI_MAX_TOKENS: u32 = 320;

#[derive(Debug, Clone)]
pub struct CommitArgs {
    pub dry_run: bool,
    pub push: bool,
    pub no_ai: bool,
    pub model: Option<String>,
    pub scope: Option<String>,
}

#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum CommitRunOutcome {
    Completed,
    NothingToCommit,
}

#[derive(Debug, Clone, Copy, PartialEq, Eq)]
enum StageAndCommitOutcome {
    Committed,
    NothingToCommit,
}

#[derive(Debug, Clone)]
pub enum CommitError {
    Operation(String),
    PushFailed {
        summary: String,
        commit_sha: Option<String>,
    },
    TerminalSessionsBlocked(String),
}

#[derive(Debug, Clone)]
struct RepoContext {
    repo_root: PathBuf,
    repo_name: String,
    branch: Option<String>,
}

#[derive(Debug, Clone, Default)]
struct BranchSyncStatus {
    upstream: Option<String>,
    ahead: usize,
    behind: usize,
}

#[derive(Debug, Clone)]
struct WorktreeAnalysis {
    repo_root: PathBuf,
    repo_name: String,
    branch: Option<String>,
    status_entries: Vec<StatusEntry>,
    files: Vec<FileChangeSummary>,
    total_additions: u32,
    total_deletions: u32,
    diff_text: String,
    new_functions: Vec<String>,
    changed_functions: Vec<String>,
    removed_functions: Vec<String>,
    new_types: Vec<String>,
    changed_types: Vec<String>,
    removed_types: Vec<String>,
    hunk_contexts: Vec<String>,
}

impl WorktreeAnalysis {
    fn repo_context(&self) -> RepoContext {
        RepoContext {
            repo_root: self.repo_root.clone(),
            repo_name: self.repo_name.clone(),
            branch: self.branch.clone(),
        }
    }
}

#[derive(Debug, Clone)]
struct StatusEntry {
    code: String,
    path: String,
}

#[derive(Debug, Clone)]
struct FileChangeSummary {
    path: String,
    status: String,
    additions: u32,
    deletions: u32,
}

#[derive(Debug, Clone)]
struct SymbolSummary {
    new_functions: Vec<String>,
    changed_functions: Vec<String>,
    removed_functions: Vec<String>,
    new_types: Vec<String>,
    changed_types: Vec<String>,
    removed_types: Vec<String>,
    hunk_contexts: Vec<String>,
}

#[derive(Debug, Clone, Copy, Eq, PartialEq)]
enum SymbolKind {
    Function,
    Type,
}

#[derive(Debug, Clone)]
struct CommitMessagePlan {
    commit: ConventionalCommit,
    generation_mode: GenerationMode,
}

#[derive(Debug, Clone)]
struct ConventionalCommit {
    commit_type: String,
    scope: Option<String>,
    description: String,
    body: Vec<String>,
    breaking_change: Option<String>,
    footers: Vec<String>,
}

#[derive(Debug, Clone, Copy)]
enum GenerationMode {
    OpenRouter,
    Heuristic,
}

#[derive(Debug, Deserialize)]
struct AiCommitPayload {
    #[serde(rename = "type")]
    commit_type: String,
    scope: Option<String>,
    description: String,
    #[serde(default)]
    body: Vec<String>,
    #[serde(default)]
    breaking_change: bool,
    breaking_description: Option<String>,
    #[serde(default)]
    footers: Vec<String>,
}

pub async fn run_commit(args: CommitArgs) -> Result<CommitRunOutcome, CommitError> {
    if !command_exists("git") {
        return Err(CommitError::Operation(
            "Git is not installed on this machine.".to_string(),
        ));
    }

    let invocation_dir = env::current_dir()
        .map_err(|e| CommitError::Operation(format!("Failed to read current directory: {}", e)))?;
    let repo = resolve_repo_context(&invocation_dir)
        .await
        .map_err(CommitError::Operation)?;
    let status_output = git_output(
        &repo.repo_root,
        &["status", "--porcelain=v1", "--untracked-files=all"],
    )
    .await
    .map_err(CommitError::Operation)?;
    let status_entries = parse_status_entries(&status_output);
    let status_entries = filter_gitignored_status_entries(&repo.repo_root, status_entries)
        .await
        .map_err(CommitError::Operation)?;

    if status_entries.is_empty() {
        let sync_status = resolve_branch_sync_status(&repo.repo_root)
            .await
            .unwrap_or_default();

        if args.push {
            return handle_clean_worktree_push(&repo, &sync_status)
                .await
                .map_err(|error| CommitError::PushFailed {
                    summary: error,
                    commit_sha: None,
                })
                .map(|()| CommitRunOutcome::Completed);
        }

        println!(
            "{}",
            render_clean_worktree_message(&repo, &sync_status).bright_yellow()
        );
        return Ok(CommitRunOutcome::NothingToCommit);
    }

    let repo_for_analysis = repo.clone();
    let analysis = analyze_worktree(repo, status_entries, &[])
        .await
        .map_err(CommitError::Operation)?;
    let excluded_terminal_paths = terminal_session_paths(&analysis);
    if !excluded_terminal_paths.is_empty()
        && analysis
            .files
            .iter()
            .all(|file| is_terminal_session_path(&file.path))
    {
        return Err(CommitError::TerminalSessionsBlocked(
            render_terminal_session_block_message(&excluded_terminal_paths),
        ));
    }

    let commit_analysis = if excluded_terminal_paths.is_empty() {
        analysis.clone()
    } else {
        println!(
            "\n{} {}",
            "Skipped".bright_yellow().bold(),
            format!(
                "excluding {} IDE terminal session file(s) from this commit: {}",
                excluded_terminal_paths.len(),
                excluded_terminal_paths.join(", ")
            )
            .bright_white()
        );
        analyze_worktree(
            repo_for_analysis,
            analysis.status_entries.clone(),
            &excluded_terminal_paths,
        )
        .await
        .map_err(CommitError::Operation)?
    };

    let (auto_push_after_commit, commit_plan) = tokio::join!(
        resolve_auto_push_on_commit(),
        generate_commit_plan(&commit_analysis, &args)
    );
    let rendered_message = render_commit_message(&commit_plan.commit);

    print_analysis_summary(&commit_analysis, &commit_plan, &rendered_message);

    if args.dry_run {
        println!(
            "\n{}",
            "Dry run only. No git commit was created."
                .bright_yellow()
                .bold()
        );
        return Ok(CommitRunOutcome::Completed);
    }

    match stage_and_commit(
        &commit_analysis.repo_root,
        &rendered_message,
        &commit_analysis.status_entries,
        &excluded_terminal_paths,
    )
    .await
    .map_err(CommitError::Operation)?
    {
        StageAndCommitOutcome::Committed => {}
        StageAndCommitOutcome::NothingToCommit => {
            let sync_status = resolve_branch_sync_status(&commit_analysis.repo_root)
                .await
                .unwrap_or_default();

            if args.push {
                handle_clean_worktree_push(&commit_analysis.repo_context(), &sync_status)
                    .await
                    .map_err(|error| CommitError::PushFailed {
                        summary: error,
                        commit_sha: None,
                    })?;
            } else {
                println!(
                    "{}",
                    render_clean_worktree_message(&commit_analysis.repo_context(), &sync_status,)
                        .bright_yellow()
                );
            }

            return Ok(CommitRunOutcome::NothingToCommit);
        }
    }

    println!("{}", "Resolving created commit...".bright_black());
    let full_sha = git_output(&commit_analysis.repo_root, &["rev-parse", "HEAD"])
        .await
        .map_err(CommitError::Operation)?;
    let short_sha = full_sha.chars().take(8).collect::<String>();

    println!(
        "\n{} {} {}",
        "Committed".bright_green().bold(),
        short_sha.bright_white().bold(),
        format!("({})", full_sha).dimmed()
    );

    if args.push || auto_push_after_commit {
        println!("{}", "Pushing current branch...".bright_black());
        match push_current_branch_with_name(
            &commit_analysis.repo_root,
            commit_analysis.branch.as_deref(),
        )
        .await
        {
            Ok(Some(outcome)) => print_push_summary(&outcome),
            Ok(None) => println!(
                "{}",
                "Push skipped because the current HEAD is detached.".bright_yellow()
            ),
            Err(error) => {
                return Err(CommitError::PushFailed {
                    summary: error,
                    commit_sha: Some(short_sha),
                });
            }
        }
    } else {
        println!(
            "{}",
            "Auto-push disabled by xbp config (`github.auto_push_on_commit: false`)."
                .bright_yellow()
        );
    }

    Ok(CommitRunOutcome::Completed)
}

async fn resolve_auto_push_on_commit() -> bool {
    load_xbp_config_with_root()
        .await
        .map(|(_, config)| config.auto_push_on_commit_enabled())
        .unwrap_or(true)
}

async fn resolve_repo_context(invocation_dir: &Path) -> Result<RepoContext, String> {
    let repo_root = PathBuf::from(
        git_output(invocation_dir, &["rev-parse", "--show-toplevel"])
            .await
            .map_err(|_| "Current directory is not inside a git repository.".to_string())?,
    );
    let repo_name = repo_name(&repo_root);
    let branch = git_output(&repo_root, &["rev-parse", "--abbrev-ref", "HEAD"])
        .await
        .ok()
        .filter(|value| !value.is_empty() && value != "HEAD");

    Ok(RepoContext {
        repo_root,
        repo_name,
        branch,
    })
}

async fn resolve_branch_sync_status(repo_root: &Path) -> Result<BranchSyncStatus, String> {
    let upstream = git_output(
        repo_root,
        &[
            "rev-parse",
            "--abbrev-ref",
            "--symbolic-full-name",
            "@{upstream}",
        ],
    )
    .await
    .ok()
    .filter(|value| !value.is_empty());

    let Some(upstream_name) = upstream else {
        return Ok(BranchSyncStatus::default());
    };

    let counts = git_output(
        repo_root,
        &["rev-list", "--left-right", "--count", "HEAD...@{upstream}"],
    )
    .await?;
    let mut parts = counts.split_whitespace();
    let ahead = parts
        .next()
        .and_then(|value| value.parse::<usize>().ok())
        .unwrap_or(0);
    let behind = parts
        .next()
        .and_then(|value| value.parse::<usize>().ok())
        .unwrap_or(0);

    Ok(BranchSyncStatus {
        upstream: Some(upstream_name),
        ahead,
        behind,
    })
}

async fn handle_clean_worktree_push(
    repo: &RepoContext,
    sync_status: &BranchSyncStatus,
) -> Result<(), String> {
    if repo.branch.is_none() {
        return Err(render_clean_worktree_message(repo, sync_status));
    }

    if sync_status.behind > 0 && sync_status.ahead == 0 {
        let branch = repo.branch.as_deref().unwrap_or("main");
        let upstream = sync_status.upstream.as_deref().unwrap_or("origin/main");
        return Err(format!(
            "`{branch}` is behind `{upstream}` by {} commit(s). Run `git pull --rebase origin {branch}`, then push again.",
            sync_status.behind
        ));
    }

    if sync_status.ahead == 0 && sync_status.behind == 0 && sync_status.upstream.is_some() {
        println!("{}", render_clean_worktree_message(repo, sync_status));
        return Ok(());
    }

    println!("{}", render_clean_worktree_message(repo, sync_status));
    match push_current_branch_with_name(&repo.repo_root, repo.branch.as_deref()).await {
        Ok(Some(outcome)) => {
            print_push_summary(&outcome);
            Ok(())
        }
        Ok(None) => Err("Push skipped because the current HEAD is detached.".to_string()),
        Err(error) => Err(error),
    }
}

fn render_clean_worktree_message(repo: &RepoContext, sync_status: &BranchSyncStatus) -> String {
    let branch_label = repo
        .branch
        .as_deref()
        .map(|branch| format!(" on `{}`", branch))
        .unwrap_or_default();

    let sync_summary = match sync_status.upstream.as_deref() {
        Some(upstream) if sync_status.ahead > 0 && sync_status.behind > 0 => format!(
            "Working tree is clean{}, with {} commit(s) waiting to push and {} commit(s) to pull from `{}`.",
            branch_label, sync_status.ahead, sync_status.behind, upstream
        ),
        Some(upstream) if sync_status.ahead > 0 => format!(
            "Working tree is clean{}, with {} commit(s) waiting to push to `{}`.",
            branch_label, sync_status.ahead, upstream
        ),
        Some(upstream) if sync_status.behind > 0 => format!(
            "Working tree is clean{}, but `{}` is ahead by {} commit(s). Pull or rebase before pushing.",
            branch_label, upstream, sync_status.behind
        ),
        Some(upstream) => format!(
            "Working tree is clean{} and already in sync with `{}`.",
            branch_label, upstream
        ),
        None if repo.branch.is_some() => format!(
            "Working tree is clean{}, and no upstream branch is configured yet.",
            branch_label
        ),
        None => "Working tree is clean, and HEAD is detached.".to_string(),
    };

    format!("Nothing to commit. {}", sync_summary)
}

async fn analyze_worktree(
    repo: RepoContext,
    status_entries: Vec<StatusEntry>,
    exclude_paths: &[String],
) -> Result<WorktreeAnalysis, String> {
    if status_entries.is_empty() {
        return Err("No worktree changes were found to commit.".to_string());
    }

    let temp_index = prepare_temporary_index(&repo.repo_root).await?;
    let temp_index_path = temp_index.path.clone();
    let git_env = [("GIT_INDEX_FILE", temp_index_path.as_os_str())];

    git_output_with_env(&repo.repo_root, &["add", "--all"], &git_env).await?;
    for path in exclude_paths {
        git_output_with_env(
            &repo.repo_root,
            &["reset", "HEAD", "--", path.as_str()],
            &git_env,
        )
        .await?;
    }
    let (name_status_output, numstat_output, diff_text) = tokio::try_join!(
        git_output_with_env(
            &repo.repo_root,
            &["diff", "--cached", "--name-status", "--find-renames"],
            &git_env,
        ),
        git_output_with_env(
            &repo.repo_root,
            &["diff", "--cached", "--numstat", "--find-renames"],
            &git_env,
        ),
        git_output_with_env(
            &repo.repo_root,
            &[
                "diff",
                "--cached",
                "--unified=0",
                "--no-color",
                "--no-ext-diff",
                "--find-renames",
            ],
            &git_env,
        ),
    )?;

    if diff_text.trim().is_empty() {
        return Err("No staged diff could be produced from the current worktree.".to_string());
    }

    let files = merge_file_summaries(&name_status_output, &numstat_output);
    let total_additions = files.iter().map(|entry| entry.additions).sum();
    let total_deletions = files.iter().map(|entry| entry.deletions).sum();
    let symbols = summarize_symbols(&diff_text);

    Ok(WorktreeAnalysis {
        repo_root: repo.repo_root,
        repo_name: repo.repo_name,
        branch: repo.branch,
        status_entries,
        files,
        total_additions,
        total_deletions,
        diff_text,
        new_functions: symbols.new_functions,
        changed_functions: symbols.changed_functions,
        removed_functions: symbols.removed_functions,
        new_types: symbols.new_types,
        changed_types: symbols.changed_types,
        removed_types: symbols.removed_types,
        hunk_contexts: symbols.hunk_contexts,
    })
}

async fn prepare_temporary_index(repo_root: &Path) -> Result<TemporaryIndex, String> {
    let real_index_path =
        PathBuf::from(git_output(repo_root, &["rev-parse", "--git-path", "index"]).await?);
    let temp_index_path = env::temp_dir().join(format!("xbp-commit-index-{}.tmp", Uuid::new_v4()));

    if real_index_path.exists() {
        fs::copy(&real_index_path, &temp_index_path).map_err(|e| {
            format!(
                "Failed to prepare temporary git index {}: {}",
                temp_index_path.display(),
                e
            )
        })?;
    } else {
        let git_env = [("GIT_INDEX_FILE", temp_index_path.as_os_str())];
        let _ = git_output_with_env(repo_root, &["read-tree", "HEAD"], &git_env).await;
    }

    Ok(TemporaryIndex {
        path: temp_index_path,
    })
}

async fn generate_commit_plan(analysis: &WorktreeAnalysis, args: &CommitArgs) -> CommitMessagePlan {
    let forced_scope = sanitize_scope(args.scope.as_deref());
    let heuristic = build_heuristic_commit(analysis, forced_scope.clone());

    if args.no_ai {
        return CommitMessagePlan {
            commit: heuristic,
            generation_mode: GenerationMode::Heuristic,
        };
    }

    let Some(api_key) = resolve_openrouter_api_key() else {
        return CommitMessagePlan {
            commit: heuristic,
            generation_mode: GenerationMode::Heuristic,
        };
    };

    let prompt = build_commit_prompt(analysis, forced_scope.as_deref(), &heuristic);
    let model = args
        .model
        .as_deref()
        .map(str::trim)
        .filter(|value| !value.is_empty())
        .map(str::to_string)
        .unwrap_or_else(resolve_openrouter_commit_model);
    let system_prompt = resolve_openrouter_commit_system_prompt();

    let ai_message = complete_prompt_with_options(
        &api_key,
        &model,
        Some(&system_prompt),
        &prompt,
        Some("XBP Commit Generator"),
        CompletionOptions::fast_json(COMMIT_AI_MAX_TOKENS),
    )
    .await
    .and_then(|raw| parse_ai_commit_payload(&raw, forced_scope.as_deref()));

    if let Some(mut commit) = ai_message {
        if commit.body.is_empty() {
            commit.body = heuristic.body.clone();
        }
        CommitMessagePlan {
            commit,
            generation_mode: GenerationMode::OpenRouter,
        }
    } else {
        CommitMessagePlan {
            commit: heuristic,
            generation_mode: GenerationMode::Heuristic,
        }
    }
}

fn build_commit_prompt(
    analysis: &WorktreeAnalysis,
    forced_scope: Option<&str>,
    heuristic: &ConventionalCommit,
) -> String {
    let focus_areas = summarize_focus_areas(analysis, MAX_PROMPT_AREAS);
    let top_files = summarize_top_files(analysis, MAX_PROMPT_FILES);
    let prompt_diff = build_prompt_diff_excerpt(analysis);
    let mut lines = vec![
        "Worktree context for commit generation:".to_string(),
        String::new(),
    ];
    lines.push(format!("Repository: {}", analysis.repo_name));
    if let Some(branch) = &analysis.branch {
        lines.push(format!("Branch: {}", branch));
    }
    if let Some(scope) = forced_scope {
        lines.push(format!("Forced scope: {}", scope));
    } else if let Some(scope) = heuristic.scope.as_deref() {
        lines.push(format!("Suggested scope: {}", scope));
    }
    lines.push(format!(
        "Heuristic fallback subject: {}",
        render_commit_subject(heuristic)
    ));
    if !focus_areas.is_empty() {
        lines.push(format!("Focus areas: {}", focus_areas.join(", ")));
    }
    if let Some(behavior_hint) = infer_behavior_hint(analysis) {
        lines.push(format!("Behavior hint: {}", behavior_hint));
    }
    if analysis
        .files
        .iter()
        .any(|file| is_terminal_session_path(&file.path))
    {
        lines.push(String::new());
        lines.push("Important constraint:".to_string());
        lines.push(
            "- paths under terminals/ are IDE agent session logs, not product features; never describe them as flows or capabilities"
                .to_string(),
        );
        lines.push(
            "- terminals/.next-id is an IDE session counter, not app configuration; never describe updating it as a feature"
                .to_string(),
        );
    }
    lines.push(String::new());
    lines.push("Worktree stats:".to_string());
    lines.push(format!("- files changed: {}", analysis.files.len()));
    lines.push(format!(
        "- lines: +{} -{}",
        analysis.total_additions, analysis.total_deletions
    ));
    if !top_files.is_empty() {
        lines.push("- dominant files:".to_string());
        for file in top_files {
            lines.push(format!("  - {}", file));
        }
    }
    if !analysis.status_entries.is_empty() {
        lines.push("- worktree statuses:".to_string());
        for entry in analysis.status_entries.iter().take(MAX_PROMPT_FILES) {
            lines.push(format!("  - {} {}", entry.code, entry.path));
        }
    }
    if !analysis.files.is_empty() {
        lines.push("- file diffs:".to_string());
        for file in analysis.files.iter().take(MAX_PROMPT_FILES) {
            lines.push(format!(
                "  - [{}] {} (+{} -{})",
                file.status, file.path, file.additions, file.deletions
            ));
        }
    }
    if !analysis.new_functions.is_empty() {
        lines.push(format!(
            "- new functions: {}",
            analysis
                .new_functions
                .iter()
                .take(MAX_PROMPT_SYMBOLS)
                .cloned()
                .collect::<Vec<_>>()
                .join(", ")
        ));
    }
    if !analysis.changed_functions.is_empty() {
        lines.push(format!(
            "- changed functions: {}",
            analysis
                .changed_functions
                .iter()
                .take(MAX_PROMPT_SYMBOLS)
                .cloned()
                .collect::<Vec<_>>()
                .join(", ")
        ));
    }
    if !analysis.new_types.is_empty() {
        lines.push(format!(
            "- new types: {}",
            analysis
                .new_types
                .iter()
                .take(MAX_PROMPT_SYMBOLS)
                .cloned()
                .collect::<Vec<_>>()
                .join(", ")
        ));
    }
    if !analysis.changed_types.is_empty() {
        lines.push(format!(
            "- changed types: {}",
            analysis
                .changed_types
                .iter()
                .take(MAX_PROMPT_SYMBOLS)
                .cloned()
                .collect::<Vec<_>>()
                .join(", ")
        ));
    }
    if !analysis.hunk_contexts.is_empty() {
        lines.push(format!(
            "- hunk contexts: {}",
            analysis
                .hunk_contexts
                .iter()
                .take(MAX_PROMPT_CONTEXTS)
                .cloned()
                .collect::<Vec<_>>()
                .join(", ")
        ));
    }
    if !prompt_diff.omitted_files.is_empty() {
        lines.push("- omitted low-signal diffs:".to_string());
        for file in prompt_diff
            .omitted_files
            .iter()
            .take(MAX_PROMPT_OMITTED_DIFFS)
        {
            lines.push(format!("  - {}", file));
        }
        if prompt_diff.omitted_files.len() > MAX_PROMPT_OMITTED_DIFFS {
            lines.push(format!(
                "  - ... {} more omitted",
                prompt_diff.omitted_files.len() - MAX_PROMPT_OMITTED_DIFFS
            ));
        }
    }
    if !prompt_diff.summaries.is_empty() {
        lines.push("- preprocessed diff summaries:".to_string());
        for summary in prompt_diff.summaries.iter().take(MAX_PROMPT_DIFF_SUMMARIES) {
            lines.push(format!("  - {}", summary));
        }
        if prompt_diff.summaries.len() > MAX_PROMPT_DIFF_SUMMARIES {
            lines.push(format!(
                "  - ... {} more summaries omitted",
                prompt_diff.summaries.len() - MAX_PROMPT_DIFF_SUMMARIES
            ));
        }
    }
    lines.push(String::new());
    if prompt_diff.excerpt.trim().is_empty() {
        lines.push("Diff excerpt: omitted".to_string());
        lines.push(
            "[all available file diffs were low-signal generated or lockfile changes; use the structured stats above]"
                .to_string(),
        );
    } else if prompt_diff.omitted_files.is_empty() {
        lines.push("Diff excerpt:".to_string());
        lines.push(prompt_diff.excerpt);
    } else {
        lines.push("Diff excerpt (low-signal generated and lockfile diffs omitted):".to_string());
        lines.push(prompt_diff.excerpt);
    }
    lines.join("\n")
}

fn parse_ai_commit_payload(raw: &str, forced_scope: Option<&str>) -> Option<ConventionalCommit> {
    let payload: AiCommitPayload = serde_json::from_str(raw).ok()?;
    let commit_type = sanitize_commit_type(&payload.commit_type)?;
    let description = sanitize_description(&payload.description)?;
    let mut body = payload
        .body
        .into_iter()
        .map(|entry| entry.trim().to_string())
        .filter(|entry| !entry.is_empty())
        .collect::<Vec<_>>();
    if body.len() > 3 {
        body.truncate(3);
    }

    let breaking_change = if payload.breaking_change {
        payload
            .breaking_description
            .as_deref()
            .and_then(sanitize_footer_value)
    } else {
        None
    };

    let mut footers = payload
        .footers
        .into_iter()
        .map(|entry| entry.trim().to_string())
        .filter(|entry| !entry.is_empty())
        .collect::<Vec<_>>();
    if breaking_change.is_some()
        && !footers
            .iter()
            .any(|entry| entry.starts_with("BREAKING CHANGE:"))
    {
        if let Some(breaking) = &breaking_change {
            footers.push(format!("BREAKING CHANGE: {}", breaking));
        }
    }

    Some(ConventionalCommit {
        commit_type,
        scope: forced_scope
            .and_then(|scope| sanitize_scope(Some(scope)))
            .or_else(|| sanitize_scope(payload.scope.as_deref())),
        description,
        body,
        breaking_change,
        footers,
    })
}

fn build_heuristic_commit(
    analysis: &WorktreeAnalysis,
    forced_scope: Option<String>,
) -> ConventionalCommit {
    let commit_type = infer_commit_type(analysis).to_string();
    let scope = forced_scope.or_else(|| infer_scope(analysis));
    let description = infer_description(analysis, &commit_type, scope.as_deref());
    let body = build_heuristic_body(analysis);

    ConventionalCommit {
        commit_type,
        scope,
        description,
        body,
        breaking_change: None,
        footers: Vec::new(),
    }
}

fn infer_commit_type(analysis: &WorktreeAnalysis) -> &'static str {
    let lowered_paths = analysis
        .files
        .iter()
        .map(|file| file.path.to_ascii_lowercase())
        .collect::<Vec<_>>();

    if !lowered_paths.is_empty()
        && lowered_paths
            .iter()
            .all(|path| is_terminal_session_path(path))
    {
        return "chore";
    }

    let docs_only = !lowered_paths.is_empty()
        && lowered_paths.iter().all(|path| {
            !is_terminal_session_path(path)
                && (path.ends_with(".md")
                    || path.ends_with(".mdx")
                    || path.ends_with(".txt")
                    || path.starts_with("docs/"))
        });
    if docs_only {
        return "docs";
    }

    let test_only = !lowered_paths.is_empty()
        && lowered_paths.iter().all(|path| {
            path.contains("/tests/")
                || path.contains("\\tests\\")
                || path.contains(".test.")
                || path.contains(".spec.")
        });
    if test_only {
        return "test";
    }

    let ci_only = !lowered_paths.is_empty()
        && lowered_paths.iter().all(|path| {
            path.starts_with(".github/")
                || path.contains("workflow")
                || path.ends_with(".yml")
                || path.ends_with(".yaml")
        });
    if ci_only {
        return "ci";
    }

    let build_only = !lowered_paths.is_empty()
        && lowered_paths.iter().all(|path| {
            path.ends_with("cargo.toml")
                || path.ends_with("cargo.lock")
                || path.ends_with("package.json")
                || path.ends_with("pnpm-lock.yaml")
                || path.ends_with("package-lock.json")
                || path.ends_with("wrangler.toml")
                || path.ends_with(".nix")
        });
    if build_only {
        return "build";
    }

    let has_new_files = analysis.files.iter().any(|file| file.status == "added");
    let has_new_symbols = !analysis.new_functions.is_empty() || !analysis.new_types.is_empty();
    let has_existing_symbol_churn = !analysis.changed_functions.is_empty()
        || !analysis.changed_types.is_empty()
        || !analysis.removed_functions.is_empty()
        || !analysis.removed_types.is_empty();
    if has_new_files {
        return "feat";
    }
    if has_new_symbols && has_existing_symbol_churn {
        return "refactor";
    }
    if has_new_symbols {
        return "feat";
    }

    if has_existing_symbol_churn || analysis.total_additions >= analysis.total_deletions {
        return "fix";
    }

    "chore"
}

fn infer_scope(analysis: &WorktreeAnalysis) -> Option<String> {
    let mut scopes = BTreeSet::new();

    for file in &analysis.files {
        let path = file.path.replace('\\', "/");
        let inferred = if path.starts_with("crates/cli/") {
            Some("cli")
        } else if path.starts_with("crates/api/") {
            Some("api")
        } else if path.starts_with("crates/github/") {
            Some("github")
        } else if path.starts_with("crates/runtime/") {
            Some("runtime")
        } else if path.starts_with("apps/web/") {
            Some("web")
        } else if path.starts_with("docs/") {
            Some("docs")
        } else if path.starts_with(".github/") {
            Some("ci")
        } else {
            None
        };

        if let Some(value) = inferred {
            scopes.insert(value.to_string());
        }
    }

    if scopes.len() == 1 {
        scopes.into_iter().next()
    } else if scopes.is_empty() {
        None
    } else if scopes.contains("cli") {
        Some("cli".to_string())
    } else {
        None
    }
}

fn infer_description(
    analysis: &WorktreeAnalysis,
    commit_type: &str,
    scope: Option<&str>,
) -> String {
    if !analysis.files.is_empty()
        && analysis
            .files
            .iter()
            .all(|file| is_terminal_session_path(&file.path))
    {
        return "ignore ide terminal session logs".to_string();
    }

    let focus_areas = summarize_focus_areas(analysis, 2);
    let behavior_hint = infer_behavior_hint(analysis);
    let interesting_names = analysis
        .files
        .iter()
        .filter_map(|file| interesting_file_stem(&file.path))
        .collect::<Vec<_>>();

    if interesting_names.iter().any(|name| name == "commit") {
        return match scope {
            Some("cli") => "add worktree commit generator".to_string(),
            _ => "add conventional commit generator".to_string(),
        };
    }

    if commit_type == "docs" {
        if let Some(name) = interesting_names.first() {
            return format!("document {}", name.replace('_', "-"));
        }
        return "update command documentation".to_string();
    }

    if let Some(area) = focus_areas.first() {
        let target = match behavior_hint {
            Some(hint) => format!("{} {}", area, hint),
            None => format!("{} flow", area),
        };
        return match commit_type {
            "feat" => format!("expand {}", target),
            "fix" => format!("improve {}", target),
            "refactor" => format!("refine {}", target),
            "test" => format!("cover {}", target),
            "ci" => format!("update {} workflow", area),
            "build" => format!("adjust {} build inputs", area),
            _ => format!("update {}", target),
        };
    }

    if let Some(name) = interesting_names.first() {
        return match commit_type {
            "feat" => format!("add {}", name.replace('_', "-")),
            "fix" => format!("improve {}", name.replace('_', "-")),
            "refactor" => format!("refactor {}", name.replace('_', "-")),
            "test" => format!("cover {}", name.replace('_', "-")),
            "ci" => format!("update {}", name.replace('_', "-")),
            "build" => format!("adjust {}", name.replace('_', "-")),
            _ => format!("update {}", name.replace('_', "-")),
        };
    }

    match commit_type {
        "feat" => "add worktree change support".to_string(),
        "fix" => "improve worktree handling".to_string(),
        "docs" => "update documentation".to_string(),
        _ => "update repository changes".to_string(),
    }
}

fn build_heuristic_body(analysis: &WorktreeAnalysis) -> Vec<String> {
    let focus_areas = summarize_focus_areas(analysis, 3);
    let top_files = summarize_top_files(analysis, 3);
    let mut paragraphs = Vec::new();
    let overview_target = if focus_areas.is_empty() {
        format!(
            "{} file{}",
            analysis.files.len(),
            if analysis.files.len() == 1 { "" } else { "s" }
        )
    } else {
        format!(
            "{} across {} file{}",
            format_focus_area_list(&focus_areas),
            analysis.files.len(),
            if analysis.files.len() == 1 { "" } else { "s" }
        )
    };
    paragraphs.push(format!(
        "Touches {} with +{} and -{} lines in the current worktree.",
        overview_target, analysis.total_additions, analysis.total_deletions
    ));

    let mut detail_parts = Vec::new();
    if !analysis.new_functions.is_empty() {
        detail_parts.push(format!(
            "adds {}",
            summarize_symbol_list(&analysis.new_functions, 4)
        ));
    }
    if !analysis.changed_functions.is_empty() {
        detail_parts.push(format!(
            "updates {}",
            summarize_symbol_list(&analysis.changed_functions, 4)
        ));
    }
    if !analysis.removed_functions.is_empty() {
        detail_parts.push(format!(
            "removes {}",
            summarize_symbol_list(&analysis.removed_functions, 3)
        ));
    }
    if !analysis.new_types.is_empty() {
        detail_parts.push(format!(
            "introduces {}",
            summarize_symbol_list(&analysis.new_types, 3)
        ));
    }
    if !analysis.changed_types.is_empty() {
        detail_parts.push(format!(
            "reshapes {}",
            summarize_symbol_list(&analysis.changed_types, 3)
        ));
    }
    if !analysis.removed_types.is_empty() {
        detail_parts.push(format!(
            "drops {}",
            summarize_symbol_list(&analysis.removed_types, 3)
        ));
    }
    if !top_files.is_empty() {
        detail_parts.push(format!(
            "with the biggest diffs in {}",
            top_files.join(", ")
        ));
    }
    if !detail_parts.is_empty() {
        paragraphs.push(format!("{}.", detail_parts.join("; ")));
    }

    paragraphs
}

fn summarize_focus_areas(analysis: &WorktreeAnalysis, limit: usize) -> Vec<String> {
    let mut area_scores = BTreeMap::<String, u32>::new();

    for file in &analysis.files {
        let Some(area) = describe_focus_area(&file.path) else {
            continue;
        };
        let weight = (file.additions + file.deletions).max(1);
        *area_scores.entry(area).or_default() += weight;
    }

    let mut ranked = area_scores.into_iter().collect::<Vec<_>>();
    ranked.sort_by(|left, right| right.1.cmp(&left.1).then_with(|| left.0.cmp(&right.0)));
    ranked
        .into_iter()
        .map(|(area, _)| area)
        .take(limit)
        .collect()
}

#[derive(Debug, Clone, PartialEq, Eq)]
struct TopFileGroup {
    label: String,
    file_count: usize,
    additions: u32,
    deletions: u32,
}

fn summarize_top_files(analysis: &WorktreeAnalysis, limit: usize) -> Vec<String> {
    let groups = collapse_top_file_groups(analysis);

    groups
        .into_iter()
        .take(limit)
        .map(|group| format_top_file_group(&group))
        .collect()
}

fn collapse_top_file_groups(analysis: &WorktreeAnalysis) -> Vec<TopFileGroup> {
    let mut parent_counts = BTreeMap::<String, usize>::new();
    for file in &analysis.files {
        if let Some(parent) = parent_dir_key(&file.path) {
            *parent_counts.entry(parent).or_default() += 1;
        }
    }

    let mut groups = BTreeMap::<String, TopFileGroup>::new();
    for file in &analysis.files {
        let label = top_file_group_label(&file.path, &parent_counts);
        let entry = groups.entry(label.clone()).or_insert(TopFileGroup {
            label,
            file_count: 0,
            additions: 0,
            deletions: 0,
        });
        entry.file_count += 1;
        entry.additions += file.additions;
        entry.deletions += file.deletions;
    }

    let mut ranked = groups.into_values().collect::<Vec<_>>();
    ranked.sort_by(|left, right| {
        let left_weight = left.additions + left.deletions;
        let right_weight = right.additions + right.deletions;
        right_weight
            .cmp(&left_weight)
            .then_with(|| left.label.cmp(&right.label))
    });
    ranked
}

fn top_file_group_label(path: &str, parent_counts: &BTreeMap<String, usize>) -> String {
    let normalized = normalize_display_path(path);
    if normalized.starts_with("terminals/") {
        return "terminals/".to_string();
    }

    if let Some(parent) = parent_dir_key(&normalized) {
        if parent_counts.get(&parent).copied().unwrap_or(0) > 1 {
            return format!("{}/", parent);
        }
    }

    normalized
}

fn is_terminal_session_path(path: &str) -> bool {
    normalize_display_path(path)
        .to_ascii_lowercase()
        .starts_with(TERMINAL_SESSION_DIR)
}

fn terminal_session_paths(analysis: &WorktreeAnalysis) -> Vec<String> {
    analysis
        .files
        .iter()
        .filter(|file| is_terminal_session_path(&file.path))
        .map(|file| file.path.clone())
        .collect()
}

fn render_terminal_session_block_message(paths: &[String]) -> String {
    format!(
        "Refusing to commit IDE terminal session dumps under `{}`. These files are agent session logs, not project source. The `.next-id` file is an IDE session counter, not application configuration.\nAdd `/terminals` to `.gitignore` and remove tracked copies with `git rm -r --cached terminals/`.\nIgnored paths: {}",
        TERMINAL_SESSION_DIR.trim_end_matches('/'),
        paths.join(", ")
    )
}

fn parent_dir_key(path: &str) -> Option<String> {
    let normalized = normalize_display_path(path);
    Path::new(&normalized)
        .parent()
        .and_then(|value| value.to_str())
        .map(normalize_display_path)
        .filter(|value| !value.is_empty())
}

fn format_top_file_group(group: &TopFileGroup) -> String {
    if group.file_count > 1 {
        format!(
            "{} ({} files, +{} -{})",
            group.label, group.file_count, group.additions, group.deletions
        )
    } else {
        format!(
            "{} (+{} -{})",
            group.label, group.additions, group.deletions
        )
    }
}

fn color_commit_type(commit_type: &str) -> colored::ColoredString {
    match commit_type {
        "feat" => commit_type.bright_green().bold(),
        "fix" => commit_type.bright_red().bold(),
        "docs" => commit_type.bright_blue().bold(),
        "refactor" => commit_type.bright_magenta().bold(),
        "chore" => commit_type.bright_black().bold(),
        "test" => commit_type.bright_cyan().bold(),
        "build" => commit_type.bright_yellow().bold(),
        "ci" => commit_type.cyan().bold(),
        "perf" => commit_type.bright_yellow().bold(),
        "style" => commit_type.white().bold(),
        "revert" => commit_type.red().bold(),
        _ => commit_type.bright_white().bold(),
    }
}

fn render_colored_commit_subject(commit: &ConventionalCommit) -> String {
    let scope = commit
        .scope
        .as_deref()
        .map(|value| format!("({})", value.magenta()))
        .unwrap_or_default();
    let bang = if commit.breaking_change.is_some() {
        "!".bright_red().to_string()
    } else {
        String::new()
    };
    let description = commit.description.bright_white();

    format!(
        "{}{}{}: {}",
        color_commit_type(&commit.commit_type),
        scope,
        bang,
        description
    )
}

fn render_commit_message_preview(commit: &ConventionalCommit) -> String {
    let mut sections = vec![render_colored_commit_subject(commit)];

    if !commit.body.is_empty() {
        sections.push(commit.body.join("\n\n"));
    }

    let mut footer_lines = commit
        .footers
        .iter()
        .map(|entry| entry.trim().to_string())
        .filter(|entry| !entry.is_empty())
        .collect::<Vec<_>>();
    if let Some(breaking_change) = &commit.breaking_change {
        if !footer_lines
            .iter()
            .any(|entry| entry.starts_with("BREAKING CHANGE:"))
        {
            footer_lines.push(format!("BREAKING CHANGE: {}", breaking_change));
        }
    }
    if !footer_lines.is_empty() {
        sections.push(footer_lines.join("\n"));
    }

    sections.join("\n\n")
}

fn format_colored_change_counts(additions: u32, deletions: u32) -> String {
    format!(
        "(+{} -{})",
        additions.to_string().bright_green(),
        deletions.to_string().bright_red()
    )
}

fn format_colored_top_file_group(group: &TopFileGroup) -> String {
    let change_counts = format_colored_change_counts(group.additions, group.deletions);
    if group.file_count > 1 {
        format!(
            "{} ({} files, {})",
            group.label.bright_white(),
            group.file_count.to_string().bright_white(),
            change_counts
        )
    } else {
        format!("{} {}", group.label.bright_white(), change_counts)
    }
}

fn describe_focus_area(path: &str) -> Option<String> {
    let normalized = normalize_display_path(path);
    if normalized.starts_with("terminals/") {
        return Some("terminals".to_string());
    }
    if normalized.starts_with("crates/cli/src/commands/") {
        return Path::new(&normalized)
            .file_stem()
            .and_then(|value| value.to_str())
            .map(humanize_focus_area)
            .filter(|value| !value.is_empty());
    }
    if normalized.contains("/http-app.") {
        return Some("http".to_string());
    }
    if normalized.contains("/server.") {
        return Some("server".to_string());
    }
    if normalized.contains("/worker/") {
        return Some("worker".to_string());
    }
    if let Some(stem) = interesting_file_stem(&normalized) {
        return Some(humanize_focus_area(&stem));
    }

    normalized
        .split('/')
        .rev()
        .find_map(normalize_focus_segment)
}

fn humanize_focus_area(raw: &str) -> String {
    raw.trim().replace(['_', '-'], " ").to_ascii_lowercase()
}

fn is_generic_path_segment(segment: &str) -> bool {
    matches!(
        segment.to_ascii_lowercase().as_str(),
        "src"
            | "crates"
            | "apps"
            | "packages"
            | "commands"
            | "tests"
            | "test"
            | "docs"
            | "lib"
            | "terminals"
    )
}

fn is_weak_focus_label(label: &str) -> bool {
    let trimmed = label.trim();
    trimmed.is_empty() || trimmed.chars().all(|ch| ch.is_ascii_digit())
}

fn normalize_focus_segment(segment: &str) -> Option<String> {
    let trimmed = segment.trim();
    if trimmed.is_empty() || is_generic_path_segment(trimmed) {
        return None;
    }

    let label = trimmed.trim_start_matches('.');
    if is_weak_focus_label(label) {
        return None;
    }

    let humanized = humanize_focus_area(label);
    if humanized.is_empty() {
        None
    } else {
        Some(humanized)
    }
}

fn infer_behavior_hint(analysis: &WorktreeAnalysis) -> Option<&'static str> {
    let mut corpus = String::new();
    for file in &analysis.files {
        corpus.push_str(&file.path.to_ascii_lowercase());
        corpus.push(' ');
    }
    for context in &analysis.hunk_contexts {
        corpus.push_str(&context.to_ascii_lowercase());
        corpus.push(' ');
    }

    if corpus.contains("request") || corpus.contains("response") || corpus.contains("http") {
        Some("request handling")
    } else if corpus.contains("auth") || corpus.contains("token") || corpus.contains("session") {
        Some("auth flow")
    } else if corpus.contains("env") || corpus.contains("config") || corpus.contains("setting") {
        Some("configuration loading")
    } else if corpus.contains("release") || corpus.contains("version") || corpus.contains("tag") {
        Some("release flow")
    } else if corpus.contains("docker") || corpus.contains("container") {
        Some("container setup")
    } else {
        None
    }
}

fn format_focus_area_list(areas: &[String]) -> String {
    match areas {
        [] => "the current worktree".to_string(),
        [one] => one.clone(),
        [left, right] => format!("{} and {}", left, right),
        _ => {
            let mut items = areas.to_vec();
            let last = items.pop().unwrap_or_default();
            format!("{}, and {}", items.join(", "), last)
        }
    }
}

fn summarize_symbol_list(entries: &[String], limit: usize) -> String {
    entries
        .iter()
        .take(limit)
        .map(|entry| {
            entry
                .split_once(" (")
                .map(|(name, _)| name.to_string())
                .unwrap_or_else(|| entry.clone())
        })
        .collect::<Vec<_>>()
        .join(", ")
}

fn render_commit_message(commit: &ConventionalCommit) -> String {
    let mut sections = vec![render_commit_subject(commit)];

    if !commit.body.is_empty() {
        sections.push(commit.body.join("\n\n"));
    }

    let mut footer_lines = commit
        .footers
        .iter()
        .map(|entry| entry.trim().to_string())
        .filter(|entry| !entry.is_empty())
        .collect::<Vec<_>>();
    if let Some(breaking_change) = &commit.breaking_change {
        if !footer_lines
            .iter()
            .any(|entry| entry.starts_with("BREAKING CHANGE:"))
        {
            footer_lines.push(format!("BREAKING CHANGE: {}", breaking_change));
        }
    }
    if !footer_lines.is_empty() {
        sections.push(footer_lines.join("\n"));
    }

    sections.join("\n\n")
}

fn render_commit_subject(commit: &ConventionalCommit) -> String {
    let scope = commit
        .scope
        .as_deref()
        .map(|value| format!("({})", value))
        .unwrap_or_default();
    let bang = if commit.breaking_change.is_some() {
        "!"
    } else {
        ""
    };
    format!(
        "{}{}{}: {}",
        commit.commit_type, scope, bang, commit.description
    )
}

fn print_analysis_summary(
    analysis: &WorktreeAnalysis,
    commit_plan: &CommitMessagePlan,
    _rendered_message: &str,
) {
    let focus_areas = summarize_focus_areas(analysis, MAX_PRINT_AREAS);
    let top_files = collapse_top_file_groups(analysis);
    let branch = analysis
        .branch
        .as_deref()
        .map(|value| format!(" on {}", value.bright_blue()))
        .unwrap_or_default();
    println!(
        "{} {}{}",
        "Commit".bright_green().bold(),
        analysis.repo_name.bright_white().bold(),
        branch
    );
    println!(
        "  {} {}",
        "Mode".bright_cyan().bold(),
        match commit_plan.generation_mode {
            GenerationMode::OpenRouter => "OpenRouter".bright_white(),
            GenerationMode::Heuristic => "Heuristic fallback".bright_white(),
        }
    );
    println!(
        "  {} {}",
        "Subject".bright_cyan().bold(),
        render_colored_commit_subject(&commit_plan.commit)
    );
    println!(
        "  {} {} file{} (+{} -{})",
        "Diff".bright_cyan().bold(),
        analysis.files.len().to_string().bright_white(),
        if analysis.files.len() == 1 { "" } else { "s" },
        analysis.total_additions.to_string().bright_green(),
        analysis.total_deletions.to_string().bright_red()
    );
    if !focus_areas.is_empty() {
        println!(
            "  {} {}",
            "Focus".bright_cyan().bold(),
            focus_areas.join(", ")
        );
    }
    if !top_files.is_empty() {
        let top_files = top_files
            .into_iter()
            .take(MAX_PRINT_FILES)
            .map(|group| format_colored_top_file_group(&group))
            .collect::<Vec<_>>();
        println!("  {} {}", "Top".bright_cyan().bold(), top_files.join(", "));
    }

    if !analysis.new_functions.is_empty() {
        println!(
            "  {} {}",
            "+fn".bright_cyan().bold(),
            summarize_symbol_list(&analysis.new_functions, MAX_PRINT_SYMBOLS)
        );
    }
    if !analysis.changed_functions.is_empty() {
        println!(
            "  {} {}",
            "~fn".bright_cyan().bold(),
            summarize_symbol_list(&analysis.changed_functions, MAX_PRINT_SYMBOLS)
        );
    }
    if !analysis.new_types.is_empty() {
        println!(
            "  {} {}",
            "+type".bright_cyan().bold(),
            summarize_symbol_list(&analysis.new_types, MAX_PRINT_SYMBOLS)
        );
    }
    if !analysis.changed_types.is_empty() {
        println!(
            "  {} {}",
            "~type".bright_cyan().bold(),
            summarize_symbol_list(&analysis.changed_types, MAX_PRINT_SYMBOLS)
        );
    }
    if !analysis.removed_functions.is_empty() {
        println!(
            "  {} {}",
            "-fn".bright_cyan().bold(),
            summarize_symbol_list(&analysis.removed_functions, MAX_PRINT_SYMBOLS)
        );
    }
    if !analysis.removed_types.is_empty() {
        println!(
            "  {} {}",
            "-type".bright_cyan().bold(),
            summarize_symbol_list(&analysis.removed_types, MAX_PRINT_SYMBOLS)
        );
    }

    println!("\n{}", "Generated commit".bright_magenta().bold());
    println!("{}", "-".repeat(72).bright_black());
    println!("{}", render_commit_message_preview(&commit_plan.commit));
    println!("{}", "-".repeat(72).bright_black());
}

async fn stage_and_commit(
    repo_root: &Path,
    message: &str,
    status_entries: &[StatusEntry],
    exclude_paths: &[String],
) -> Result<StageAndCommitOutcome, String> {
    stage_commit_paths(repo_root, status_entries, exclude_paths).await?;

    let message_path = env::temp_dir().join(format!("xbp-commit-message-{}.txt", Uuid::new_v4()));
    fs::write(&message_path, message).map_err(|e| {
        format!(
            "Failed to write temporary commit message {}: {}",
            message_path.display(),
            e
        )
    })?;

    println!("{}", "Creating git commit...".bright_black());
    let result = git_output_streaming(
        repo_root,
        &["commit", "--file", &message_path.to_string_lossy()],
    )
    .await;
    let _ = fs::remove_file(&message_path);
    match result {
        Ok(_) => Ok(StageAndCommitOutcome::Committed),
        Err(error) if looks_like_nothing_to_commit_error(&error) => {
            if !git_has_staged_changes(repo_root).await? && git_worktree_is_clean(repo_root).await?
            {
                Ok(StageAndCommitOutcome::NothingToCommit)
            } else {
                Err(error)
            }
        }
        Err(error) => Err(error),
    }
}

async fn stage_commit_paths(
    repo_root: &Path,
    status_entries: &[StatusEntry],
    exclude_paths: &[String],
) -> Result<(), String> {
    let stage_paths = stage_pathspecs(status_entries);
    let StageStrategy::BulkAddAll { path_count } =
        choose_stage_strategy(&stage_paths, exclude_paths);
    // Always bulk-stage. Explicit pathspecs are fragile on Windows (argv limits) and
    // unnecessary: commit stages the whole worktree minus explicit excludes.
    // `git add --all` also respects .gitignore.
    if path_count == 0 {
        println!("{}", "Staging worktree changes...".bright_black());
    } else {
        println!(
            "{}",
            format!("Staging {} changed path(s)...", path_count).bright_black()
        );
    }
    git_output(repo_root, &["add", "--all"]).await?;

    for path in exclude_paths {
        println!(
            "{} {}",
            "Keeping excluded path unstaged:".bright_black(),
            path.bright_white()
        );
        git_output(repo_root, &["reset", "HEAD", "--", path.as_str()]).await?;
    }
    Ok(())
}

#[derive(Debug, Clone, PartialEq, Eq)]
enum StageStrategy {
    /// Stage via `git add --all` (ignore-aware, no argv length risk).
    BulkAddAll { path_count: usize },
}

fn choose_stage_strategy(stage_paths: &[String], _exclude_paths: &[String]) -> StageStrategy {
    StageStrategy::BulkAddAll {
        path_count: stage_paths.len(),
    }
}

#[cfg(test)]
fn pathspecs_exceed_safe_argv_budget(paths: &[String]) -> bool {
    if paths.len() > SAFE_GIT_PATHSPEC_COUNT {
        return true;
    }
    // Historical bulk-add threshold: long explicit pathspec argv lists are unsafe.
    let fixed = "git add --all --".len();
    let paths_chars: usize = paths.iter().map(|path| path.len().saturating_add(1)).sum();
    fixed.saturating_add(paths_chars) > SAFE_GIT_ARGV_CHAR_BUDGET
}

fn stage_pathspecs(status_entries: &[StatusEntry]) -> Vec<String> {
    let mut paths = BTreeSet::new();
    for entry in status_entries {
        let path = entry.path.trim();
        if path.is_empty() || path.contains(" -> ") {
            return Vec::new();
        }
        // Never feed gitignored-looking path markers into explicit pathspecs.
        // Porcelain without --ignored does not list untracked ignored files; this is a
        // defensive guard if status output is ever assembled from other sources.
        if path.ends_with('/') && path.contains(".git/") {
            continue;
        }
        paths.insert(path.to_string());
    }
    paths.into_iter().collect()
}

/// Drop untracked paths that match `.gitignore` / exclude rules so they are neither
/// analyzed for the commit message nor staged. Tracked files that later match ignore
/// rules still appear in status (git continues to track them until untracked).
async fn filter_gitignored_status_entries(
    repo_root: &Path,
    status_entries: Vec<StatusEntry>,
) -> Result<Vec<StatusEntry>, String> {
    let untracked: Vec<&StatusEntry> = status_entries
        .iter()
        .filter(|entry| entry.code.contains('?'))
        .collect();
    if untracked.is_empty() {
        return Ok(status_entries);
    }

    let ignored = git_check_ignore_paths(
        repo_root,
        &untracked
            .iter()
            .map(|entry| entry.path.as_str())
            .collect::<Vec<_>>(),
    )
    .await?;

    if ignored.is_empty() {
        return Ok(status_entries);
    }

    println!(
        "{} {}",
        "Skipped".bright_yellow().bold(),
        format!(
            "excluding {} path(s) matching .gitignore / exclude rules from commit analysis and staging",
            ignored.len()
        )
        .bright_white()
    );

    Ok(status_entries
        .into_iter()
        .filter(|entry| !(entry.code.contains('?') && ignored.contains(&entry.path)))
        .collect())
}

async fn git_check_ignore_paths(
    repo_root: &Path,
    paths: &[&str],
) -> Result<BTreeSet<String>, String> {
    if paths.is_empty() {
        return Ok(BTreeSet::new());
    }

    let mut command = Command::new("git");
    command
        .current_dir(repo_root)
        .args(["check-ignore", "--stdin"])
        .stdin(std::process::Stdio::piped())
        .stdout(std::process::Stdio::piped())
        .stderr(std::process::Stdio::piped());

    let mut child = command
        .spawn()
        .map_err(|e| format!("Failed to run `git check-ignore`: {}", e))?;

    if let Some(mut stdin) = child.stdin.take() {
        use tokio::io::AsyncWriteExt;
        let body = paths.join("\n");
        stdin
            .write_all(body.as_bytes())
            .await
            .map_err(|e| format!("Failed to write paths to `git check-ignore`: {}", e))?;
        // Close stdin so check-ignore can finish.
        drop(stdin);
    }

    let output = child
        .wait_with_output()
        .await
        .map_err(|e| format!("Failed to wait for `git check-ignore`: {}", e))?;

    // Exit 0: some paths ignored; 1: none ignored. Both are success outcomes.
    match output.status.code() {
        Some(0) | Some(1) => {}
        _ => {
            let stderr = String::from_utf8_lossy(&output.stderr).trim().to_string();
            if !stderr.is_empty() {
                return Err(format!("`git check-ignore` failed: {}", stderr));
            }
            return Err(format!(
                "`git check-ignore` failed with status {}",
                output.status
            ));
        }
    }

    let ignored = String::from_utf8_lossy(&output.stdout)
        .lines()
        .map(str::trim)
        .filter(|line| !line.is_empty())
        .map(|line| line.replace('\\', "/"))
        .collect();
    Ok(ignored)
}

fn format_git_args_for_error(args: &[&str]) -> String {
    let joined = args.join(" ");
    if joined.chars().count() <= MAX_GIT_ERROR_ARG_CHARS {
        return joined;
    }
    let truncated: String = joined.chars().take(MAX_GIT_ERROR_ARG_CHARS).collect();
    format!(
        "{}… [{} args, truncated for display]",
        truncated,
        args.len()
    )
}

fn parse_status_entries(output: &str) -> Vec<StatusEntry> {
    output
        .lines()
        .filter_map(|line| {
            // Porcelain v1: fixed two-column XY status, then a space, then the path.
            // Do not trim the line first — leading space is a valid X status (e.g. ` M`).
            if line.len() < 4 {
                return None;
            }
            let code = line[..2].trim().to_string();
            let path = line[3..].trim().replace('\\', "/");
            // Unquote git's C-style quoted paths when present.
            let path = unquote_porcelain_path(&path);
            if path.is_empty() {
                None
            } else {
                Some(StatusEntry { code, path })
            }
        })
        .collect()
}

fn unquote_porcelain_path(path: &str) -> String {
    let trimmed = path.trim();
    if trimmed.len() >= 2 && trimmed.starts_with('"') && trimmed.ends_with('"') {
        // Minimal unescape for common git quoted paths; keep contents otherwise.
        trimmed[1..trimmed.len() - 1]
            .replace("\\\\", "\\")
            .replace("\\\"", "\"")
            .replace("\\t", "\t")
            .replace("\\n", "\n")
            .replace("\\r", "\r")
    } else {
        trimmed.to_string()
    }
}

fn merge_file_summaries(name_status: &str, numstat: &str) -> Vec<FileChangeSummary> {
    let mut status_map = BTreeMap::new();
    let mut display_path_map = BTreeMap::new();

    for raw_line in name_status
        .lines()
        .map(str::trim)
        .filter(|line| !line.is_empty())
    {
        let parts = raw_line.split('\t').collect::<Vec<_>>();
        if parts.is_empty() {
            continue;
        }
        let status = normalize_name_status(parts[0]);
        match parts.as_slice() {
            [_, path] => {
                let key = normalize_path_key(path);
                display_path_map.insert(key.clone(), normalize_display_path(path));
                status_map.insert(key, status);
            }
            [_, old_path, new_path] => {
                let key = normalize_path_key(new_path);
                display_path_map.insert(
                    key.clone(),
                    format!(
                        "{} -> {}",
                        normalize_display_path(old_path),
                        normalize_display_path(new_path)
                    ),
                );
                status_map.insert(key, status);
            }
            _ => {}
        }
    }

    let mut files = Vec::new();
    for raw_line in numstat
        .lines()
        .map(str::trim)
        .filter(|line| !line.is_empty())
    {
        let parts = raw_line.split('\t').collect::<Vec<_>>();
        if parts.len() < 3 {
            continue;
        }
        let additions = parts[0].parse::<u32>().unwrap_or(0);
        let deletions = parts[1].parse::<u32>().unwrap_or(0);
        let raw_path = parts[2..].join("\t");
        let key = normalize_path_key(&raw_path);
        let path = display_path_map
            .get(&key)
            .cloned()
            .unwrap_or_else(|| normalize_display_path(&raw_path));
        let status = status_map
            .get(&key)
            .cloned()
            .unwrap_or_else(|| "modified".to_string());
        files.push(FileChangeSummary {
            path,
            status,
            additions,
            deletions,
        });
    }

    if files.is_empty() {
        for (key, status) in status_map {
            files.push(FileChangeSummary {
                path: display_path_map
                    .get(&key)
                    .cloned()
                    .unwrap_or_else(|| key.clone()),
                status,
                additions: 0,
                deletions: 0,
            });
        }
    }

    files
}

fn summarize_symbols(diff_text: &str) -> SymbolSummary {
    let mut current_file = String::new();
    let mut added_functions = BTreeSet::new();
    let mut removed_functions = BTreeSet::new();
    let mut added_types = BTreeSet::new();
    let mut removed_types = BTreeSet::new();
    let mut changed_functions = BTreeSet::new();
    let mut changed_types = BTreeSet::new();
    let mut hunk_contexts = BTreeSet::new();

    for line in diff_text.lines() {
        if let Some(rest) = line.strip_prefix("+++ b/") {
            current_file = rest.trim().replace('\\', "/");
            continue;
        }
        if line.starts_with("@@") {
            if let Some(context) = parse_hunk_context(line) {
                if is_code_path(&current_file) {
                    if let Some((symbol, kind)) = extract_context_symbol(&context) {
                        match kind {
                            SymbolKind::Function => {
                                changed_functions.insert(symbol);
                            }
                            SymbolKind::Type => {
                                changed_types.insert(symbol);
                            }
                        }
                    }
                }
                if prompt_diff_omit_reason(&current_file).is_none()
                    && !is_low_signal_hunk_context(&context)
                {
                    hunk_contexts.insert(context);
                }
            }
            continue;
        }

        if current_file.is_empty() || line.starts_with("+++") || line.starts_with("---") {
            continue;
        }

        if let Some(source) = line.strip_prefix('+') {
            if let Some(name) = extract_function_name(source) {
                added_functions.insert(format!("{} ({})", name, current_file));
            }
            if let Some(name) = extract_type_name(source) {
                added_types.insert(format!("{} ({})", name, current_file));
            }
        } else if let Some(source) = line.strip_prefix('-') {
            if let Some(name) = extract_function_name(source) {
                removed_functions.insert(format!("{} ({})", name, current_file));
            }
            if let Some(name) = extract_type_name(source) {
                removed_types.insert(format!("{} ({})", name, current_file));
            }
        }
    }

    let changed_functions_from_dupes = added_functions
        .intersection(&removed_functions)
        .cloned()
        .collect::<BTreeSet<_>>();
    let changed_types_from_dupes = added_types
        .intersection(&removed_types)
        .cloned()
        .collect::<BTreeSet<_>>();

    for entry in &changed_functions_from_dupes {
        changed_functions.insert(entry.clone());
    }
    for entry in &changed_types_from_dupes {
        changed_types.insert(entry.clone());
    }

    let new_functions = added_functions
        .difference(&changed_functions_from_dupes)
        .cloned()
        .collect::<Vec<_>>();
    let removed_functions = removed_functions
        .difference(&changed_functions_from_dupes)
        .cloned()
        .collect::<Vec<_>>();
    let new_types = added_types
        .difference(&changed_types_from_dupes)
        .cloned()
        .collect::<Vec<_>>();
    let removed_types = removed_types
        .difference(&changed_types_from_dupes)
        .cloned()
        .collect::<Vec<_>>();

    SymbolSummary {
        new_functions,
        changed_functions: changed_functions.into_iter().collect(),
        removed_functions,
        new_types,
        changed_types: changed_types.into_iter().collect(),
        removed_types,
        hunk_contexts: hunk_contexts.into_iter().collect(),
    }
}

fn parse_hunk_context(line: &str) -> Option<String> {
    let parts = line.split("@@").collect::<Vec<_>>();
    if parts.len() < 3 {
        return None;
    }
    let context = parts[2].trim();
    if context.is_empty() {
        None
    } else {
        Some(context.to_string())
    }
}

fn is_low_signal_hunk_context(context: &str) -> bool {
    let normalized = context.trim().to_ascii_lowercase();
    normalized.is_empty()
        || matches!(
            normalized.as_str(),
            "importers:" | "packages:" | "snapshots:" | "[[package]]"
        )
        || normalized.starts_with("name = ")
        || normalized.starts_with("version = ")
        || normalized.starts_with("source = ")
        || normalized.starts_with("checksum = ")
}

fn extract_context_symbol(context: &str) -> Option<(String, SymbolKind)> {
    let trimmed = context.trim();
    if trimmed.is_empty() {
        return None;
    }

    for capture in [
        RUST_FUNCTION_RE.captures(trimmed),
        JS_FUNCTION_RE.captures(trimmed),
    ]
    .into_iter()
    .flatten()
    {
        if let Some(name) = capture.get(1) {
            let symbol = name.as_str().to_string();
            if is_noise_symbol(&symbol) {
                return None;
            }
            return Some((symbol, SymbolKind::Function));
        }
    }

    if let Some(capture) = JS_ARROW_RE.captures(trimmed) {
        if let Some(name) = capture.get(1) {
            let symbol = name.as_str().to_string();
            if is_noise_symbol(&symbol) {
                return None;
            }
            return Some((symbol, SymbolKind::Function));
        }
    }

    for capture in [RUST_TYPE_RE.captures(trimmed), TS_TYPE_RE.captures(trimmed)]
        .into_iter()
        .flatten()
    {
        if let Some(name) = capture.get(2) {
            let symbol = name.as_str().to_string();
            if is_noise_symbol(&symbol) {
                return None;
            }
            return Some((symbol, SymbolKind::Type));
        }
    }

    if let Some(capture) = METHOD_CONTEXT_RE.captures(trimmed) {
        if let Some(name) = capture.get(1) {
            let symbol = name.as_str().to_string();
            if is_noise_symbol(&symbol) {
                return None;
            }
            return Some((symbol, SymbolKind::Function));
        }
    }

    None
}

fn extract_function_name(source: &str) -> Option<String> {
    for capture in [
        RUST_FUNCTION_RE.captures(source),
        JS_FUNCTION_RE.captures(source),
        JS_ARROW_RE.captures(source),
    ]
    .into_iter()
    .flatten()
    {
        if let Some(name) = capture.get(1) {
            return Some(name.as_str().to_string());
        }
    }
    None
}

fn extract_type_name(source: &str) -> Option<String> {
    for capture in [RUST_TYPE_RE.captures(source), TS_TYPE_RE.captures(source)]
        .into_iter()
        .flatten()
    {
        if let Some(name) = capture.get(2) {
            return Some(name.as_str().to_string());
        }
    }
    None
}

fn is_code_path(path: &str) -> bool {
    let normalized = path.to_ascii_lowercase();
    [
        ".rs", ".ts", ".tsx", ".js", ".jsx", ".mjs", ".cjs", ".py", ".go", ".java", ".kt", ".swift",
    ]
    .iter()
    .any(|extension| normalized.ends_with(extension))
}

fn is_noise_symbol(symbol: &str) -> bool {
    matches!(
        symbol,
        "fn" | "pub"
            | "impl"
            | "mod"
            | "use"
            | "struct"
            | "enum"
            | "trait"
            | "type"
            | "class"
            | "interface"
            | "const"
            | "let"
            | "var"
            | "async"
            | "await"
            | "match"
            | "if"
            | "else"
            | "for"
            | "while"
            | "loop"
    )
}

fn sanitize_commit_type(raw: &str) -> Option<String> {
    let normalized = raw.trim().to_ascii_lowercase();
    if CONVENTIONAL_TYPES.contains(&normalized.as_str()) {
        Some(normalized)
    } else {
        None
    }
}

fn sanitize_scope(raw: Option<&str>) -> Option<String> {
    let raw = raw?.trim();
    if raw.is_empty() {
        return None;
    }
    let sanitized = raw
        .chars()
        .filter(|ch| ch.is_ascii_alphanumeric() || matches!(ch, '-' | '_' | '/'))
        .collect::<String>()
        .to_ascii_lowercase();
    if sanitized.is_empty() {
        None
    } else {
        Some(sanitized)
    }
}

fn sanitize_description(raw: &str) -> Option<String> {
    let trimmed = raw.trim().trim_matches('"').trim();
    if trimmed.is_empty() {
        return None;
    }
    let normalized = trimmed.trim_end_matches('.').trim();
    if normalized.is_empty() {
        None
    } else {
        Some(normalized.to_string())
    }
}

fn sanitize_footer_value(raw: &str) -> Option<String> {
    let trimmed = raw.trim();
    if trimmed.is_empty() {
        None
    } else {
        Some(trimmed.to_string())
    }
}

fn interesting_file_stem(path: &str) -> Option<String> {
    let stem = Path::new(path)
        .file_stem()
        .and_then(|value| value.to_str())
        .map(|value| value.trim().trim_start_matches('.').to_ascii_lowercase())?;
    if stem.is_empty()
        || is_weak_focus_label(&stem)
        || matches!(
            stem.as_str(),
            "mod" | "lib" | "main" | "readme" | "index" | "commands" | "router"
        )
    {
        None
    } else {
        Some(stem)
    }
}

fn normalize_name_status(raw: &str) -> String {
    let code = raw.chars().next().unwrap_or('M');
    match code {
        'A' => "added",
        'D' => "deleted",
        'R' => "renamed",
        'C' => "copied",
        'T' => "typechange",
        'U' => "unmerged",
        'M' => "modified",
        _ => "modified",
    }
    .to_string()
}

fn normalize_display_path(raw: &str) -> String {
    raw.trim().replace('\\', "/")
}

fn normalize_path_key(raw: &str) -> String {
    let cleaned = raw.trim().replace(['{', '}'], "").replace('\\', "/");
    if let Some((_, tail)) = cleaned.split_once("=>") {
        tail.trim().to_string()
    } else {
        cleaned
    }
}

fn repo_name(path: &Path) -> String {
    path.file_name()
        .and_then(|value| value.to_str())
        .filter(|value| !value.trim().is_empty())
        .unwrap_or("repository")
        .to_string()
}

fn truncate_for_prompt(text: &str, limit: usize) -> String {
    if text.chars().count() <= limit {
        return text.to_string();
    }

    let truncated = text.chars().take(limit).collect::<String>();
    format!(
        "{}\n\n[diff truncated after {} characters]",
        truncated, limit
    )
}

async fn git_output(project_root: &Path, args: &[&str]) -> Result<String, String> {
    git_output_with_env(project_root, args, &[]).await
}

async fn git_output_streaming(project_root: &Path, args: &[&str]) -> Result<String, String> {
    git_output_with_env_streaming(project_root, args, &[]).await
}

async fn git_has_staged_changes(project_root: &Path) -> Result<bool, String> {
    let output = Command::new("git")
        .current_dir(project_root)
        .args(["diff", "--cached", "--quiet", "--exit-code"])
        .output()
        .await
        .map_err(|e| {
            format!(
                "Failed to run `git diff --cached --quiet --exit-code`: {}",
                e
            )
        })?;

    match output.status.code() {
        Some(0) => Ok(false),
        Some(1) => Ok(true),
        _ => {
            let stderr = String::from_utf8_lossy(&output.stderr).trim().to_string();
            if stderr.is_empty() {
                Err(format!(
                    "`git diff --cached --quiet --exit-code` failed with status {}",
                    output.status
                ))
            } else {
                Err(format!(
                    "`git diff --cached --quiet --exit-code` failed: {}",
                    stderr
                ))
            }
        }
    }
}

async fn git_worktree_is_clean(project_root: &Path) -> Result<bool, String> {
    let status = git_output(
        project_root,
        &["status", "--porcelain=v1", "--untracked-files=all"],
    )
    .await?;
    Ok(parse_status_entries(&status).is_empty())
}

fn looks_like_nothing_to_commit_error(error: &str) -> bool {
    let lowered = error.to_ascii_lowercase();
    lowered.contains("nothing to commit")
        || lowered.contains("working tree clean")
        || lowered.contains("no changes added to commit")
}

async fn git_output_with_env(
    project_root: &Path,
    args: &[&str],
    envs: &[(&str, &std::ffi::OsStr)],
) -> Result<String, String> {
    let mut command = Command::new("git");
    command.current_dir(project_root).args(args);
    for (key, value) in envs {
        command.env(key, value);
    }

    let display_args = format_git_args_for_error(args);
    let output = command
        .output()
        .await
        .map_err(|e| format!("Failed to run `git {}`: {}", display_args, e))?;

    if !output.status.success() {
        let stderr = String::from_utf8_lossy(&output.stderr).trim().to_string();
        if stderr.is_empty() {
            return Err(format!(
                "`git {}` failed with status {}",
                display_args, output.status
            ));
        }
        return Err(format!("`git {}` failed: {}", display_args, stderr));
    }

    // Use trim_end only. Full trim() eats the leading space on porcelain
    // status lines like ` M path` (worktree-only changes), which shifts the
    // XY/path columns and corrupts paths (e.g. `.xbp/foo` → `xbp/foo`,
    // `src/bin/x.rs` → `rc/bin/x.rs`).
    Ok(String::from_utf8_lossy(&output.stdout)
        .trim_end()
        .to_string())
}

async fn git_output_with_env_streaming(
    project_root: &Path,
    args: &[&str],
    envs: &[(&str, &std::ffi::OsStr)],
) -> Result<String, String> {
    let mut command = Command::new("git");
    command
        .current_dir(project_root)
        .args(args)
        .stdout(std::process::Stdio::piped())
        .stderr(std::process::Stdio::piped());
    for (key, value) in envs {
        command.env(key, value);
    }

    let display_args = format_git_args_for_error(args);
    let mut child = command
        .spawn()
        .map_err(|e| format!("Failed to run `git {}`: {}", display_args, e))?;

    let stdout = child
        .stdout
        .take()
        .ok_or_else(|| format!("Failed to capture stdout for `git {}`", display_args))?;
    let stderr = child
        .stderr
        .take()
        .ok_or_else(|| format!("Failed to capture stderr for `git {}`", display_args))?;

    let stdout_task = tokio::spawn(stream_child_output(stdout, false));
    let stderr_task = tokio::spawn(stream_child_output(stderr, true));

    let status = child
        .wait()
        .await
        .map_err(|e| format!("Failed to wait for `git {}`: {}", display_args, e))?;

    let stdout = stdout_task
        .await
        .map_err(|e| {
            format!(
                "Failed to join stdout task for `git {}`: {}",
                display_args, e
            )
        })?
        .map_err(|e| format!("Failed to read stdout for `git {}`: {}", display_args, e))?;
    let stderr = stderr_task
        .await
        .map_err(|e| {
            format!(
                "Failed to join stderr task for `git {}`: {}",
                display_args, e
            )
        })?
        .map_err(|e| format!("Failed to read stderr for `git {}`: {}", display_args, e))?;

    if !status.success() {
        let stderr = String::from_utf8_lossy(&stderr).trim().to_string();
        if stderr.is_empty() {
            return Err(format!(
                "`git {}` failed with status {}",
                display_args, status
            ));
        }
        return Err(format!("`git {}` failed: {}", display_args, stderr));
    }

    Ok(String::from_utf8_lossy(&stdout).trim_end().to_string())
}

async fn stream_child_output<R>(reader: R, stderr: bool) -> io::Result<Vec<u8>>
where
    R: AsyncRead + Unpin,
{
    let mut reader = BufReader::new(reader);
    let mut collected = Vec::new();
    let mut chunk = Vec::new();

    loop {
        chunk.clear();
        let bytes_read = reader.read_until(b'\n', &mut chunk).await?;
        if bytes_read == 0 {
            break;
        }

        if stderr {
            let mut handle = io::stderr().lock();
            handle.write_all(&chunk)?;
            handle.flush()?;
        } else {
            let mut handle = io::stdout().lock();
            handle.write_all(&chunk)?;
            handle.flush()?;
        }

        collected.extend_from_slice(&chunk);
    }

    Ok(collected)
}

struct TemporaryIndex {
    path: PathBuf,
}

impl Drop for TemporaryIndex {
    fn drop(&mut self) {
        let _ = fs::remove_file(&self.path);
    }
}

#[cfg(test)]
mod tests {
    use super::{
        build_commit_prompt, build_heuristic_body, build_heuristic_commit,
        build_prompt_diff_excerpt, choose_stage_strategy, describe_focus_area,
        format_colored_change_counts, format_colored_top_file_group, format_git_args_for_error,
        infer_commit_type, infer_description, is_terminal_session_path,
        looks_like_nothing_to_commit_error, parse_ai_commit_payload, parse_status_entries,
        pathspecs_exceed_safe_argv_budget, render_clean_worktree_message, render_commit_message,
        render_commit_message_preview, render_commit_subject, render_terminal_session_block_message,
        sanitize_scope, stage_pathspecs, summarize_focus_areas, summarize_symbols,
        summarize_top_files, terminal_session_paths, BranchSyncStatus, ConventionalCommit,
        FileChangeSummary, RepoContext, StageStrategy, StatusEntry, TopFileGroup, WorktreeAnalysis,
        SAFE_GIT_ARGV_CHAR_BUDGET, SAFE_GIT_PATHSPEC_COUNT,
    };
    use std::path::PathBuf;

    fn server_refactor_analysis() -> WorktreeAnalysis {
        WorktreeAnalysis {
            repo_root: PathBuf::from("C:/repo"),
            repo_name: "xbp".to_string(),
            branch: Some("feature/refine-server".to_string()),
            status_entries: vec![StatusEntry {
                code: "M".to_string(),
                path: "src/server.ts".to_string(),
            }],
            files: vec![
                FileChangeSummary {
                    path: "src/server.ts".to_string(),
                    status: "modified".to_string(),
                    additions: 80,
                    deletions: 24,
                },
                FileChangeSummary {
                    path: "src/http-app.ts".to_string(),
                    status: "modified".to_string(),
                    additions: 42,
                    deletions: 11,
                },
                FileChangeSummary {
                    path: "src/worker/types.ts".to_string(),
                    status: "modified".to_string(),
                    additions: 12,
                    deletions: 3,
                },
            ],
            total_additions: 134,
            total_deletions: 38,
            diff_text: String::new(),
            new_functions: vec![
                "buildEnvFromProcess (src/server.ts)".to_string(),
                "handleNodeRequest (src/server.ts)".to_string(),
            ],
            changed_functions: vec!["handleHttpRequest (src/http-app.ts)".to_string()],
            removed_functions: Vec::new(),
            new_types: vec!["ExecutionContextLike (src/http-app.ts)".to_string()],
            changed_types: vec!["Env (src/worker/types.ts)".to_string()],
            removed_types: Vec::new(),
            hunk_contexts: vec!["async function handleHttpRequest(request: Request)".to_string()],
        }
    }

    #[test]
    fn symbol_summary_tracks_new_and_changed_symbols() {
        let diff = r#"
diff --git a/crates/cli/src/commands/commit.rs b/crates/cli/src/commands/commit.rs
index 1111111..2222222 100644
--- a/crates/cli/src/commands/commit.rs
+++ b/crates/cli/src/commands/commit.rs
@@ -0,0 +1,3 @@
+pub struct CommitArgs {
+}
+pub async fn run_commit() {}
@@ -10,1 +12,1 @@ pub async fn old_name() {}
-pub async fn old_name() {}
+pub async fn old_name() {}
"#;
        let summary = summarize_symbols(diff);
        assert!(summary
            .new_functions
            .iter()
            .any(|item| item.contains("run_commit")));
        assert!(summary
            .new_types
            .iter()
            .any(|item| item.contains("CommitArgs")));
        assert!(summary
            .changed_functions
            .iter()
            .any(|item| item.contains("old_name")));
    }

    #[test]
    fn ai_payload_respects_forced_scope() {
        let raw = r#"{
  "type": "feat",
  "scope": "wrong",
  "description": "add commit command",
  "body": ["Summarize the worktree."],
  "breaking_change": false,
  "footers": []
}"#;

        let commit = parse_ai_commit_payload(raw, Some("cli")).expect("parse");
        assert_eq!(commit.scope.as_deref(), Some("cli"));
        assert_eq!(commit.commit_type, "feat");
    }

    #[test]
    fn renders_breaking_change_footer_once() {
        let rendered = render_commit_message(&ConventionalCommit {
            commit_type: "feat".to_string(),
            scope: Some("cli".to_string()),
            description: "add commit command".to_string(),
            body: vec!["Summarize the worktree.".to_string()],
            breaking_change: Some("existing automation must call xbp commit".to_string()),
            footers: Vec::new(),
        });

        assert!(rendered.contains("feat(cli)!: add commit command"));
        assert!(rendered.contains("BREAKING CHANGE: existing automation must call xbp commit"));
    }

    #[test]
    fn plain_commit_renderers_stay_uncolored() {
        let commit = ConventionalCommit {
            commit_type: "fix".to_string(),
            scope: Some("cli".to_string()),
            description: "tighten summary output".to_string(),
            body: vec!["Keep the git payload plain.".to_string()],
            breaking_change: None,
            footers: vec!["Reviewed-by: ops".to_string()],
        };

        let subject = render_commit_subject(&commit);
        let message = render_commit_message(&commit);

        assert_eq!(subject, "fix(cli): tighten summary output");
        assert!(!subject.contains('\u{1b}'));
        assert!(!message.contains('\u{1b}'));
    }

    #[test]
    fn preview_subject_colors_type_and_scope_independently() {
        let commit = ConventionalCommit {
            commit_type: "feat".to_string(),
            scope: Some("docs".to_string()),
            description: "refresh operator docs".to_string(),
            body: Vec::new(),
            breaking_change: None,
            footers: Vec::new(),
        };

        colored::control::set_override(true);
        let preview = render_commit_message_preview(&commit);
        colored::control::set_override(false);

        assert!(preview.contains('\u{1b}'));
        assert!(preview.contains("feat"));
        assert!(preview.contains("docs"));
        assert!(preview.contains("refresh operator docs"));
    }

    #[test]
    fn diff_summary_colors_additions_and_deletions_independently() {
        colored::control::set_override(true);
        let summary = format_colored_change_counts(29_948, 2_740);
        colored::control::set_override(false);
        assert!(summary.contains('\u{1b}'));
        assert!(summary.contains("29948"));
        assert!(summary.contains("2740"));
    }

    #[test]
    fn top_file_groups_color_nested_change_counts() {
        colored::control::set_override(true);
        let group = TopFileGroup {
            label: "apps/docs/generated/".to_string(),
            file_count: 3,
            additions: 22_125,
            deletions: 0,
        };

        let summary = format_colored_top_file_group(&group);
        colored::control::set_override(false);
        assert!(summary.contains("apps/docs/generated/"));
        assert!(summary.contains("files"));
        assert!(summary.contains('\u{1b}'));
        assert!(summary.contains("22125"));
    }

    #[test]
    fn infers_feat_for_new_symbols() {
        let analysis = WorktreeAnalysis {
            repo_root: PathBuf::from("C:/repo"),
            repo_name: "xbp".to_string(),
            branch: Some("main".to_string()),
            status_entries: vec![StatusEntry {
                code: "??".to_string(),
                path: "crates/cli/src/commands/commit.rs".to_string(),
            }],
            files: vec![FileChangeSummary {
                path: "crates/cli/src/commands/commit.rs".to_string(),
                status: "added".to_string(),
                additions: 120,
                deletions: 0,
            }],
            total_additions: 120,
            total_deletions: 0,
            diff_text: String::new(),
            new_functions: vec!["run_commit (crates/cli/src/commands/commit.rs)".to_string()],
            changed_functions: Vec::new(),
            removed_functions: Vec::new(),
            new_types: vec!["CommitArgs (crates/cli/src/commands/commit.rs)".to_string()],
            changed_types: Vec::new(),
            removed_types: Vec::new(),
            hunk_contexts: Vec::new(),
        };

        assert_eq!(infer_commit_type(&analysis), "feat");
    }

    #[test]
    fn infers_refactor_for_new_symbols_inside_existing_modules() {
        let analysis = server_refactor_analysis();
        assert_eq!(infer_commit_type(&analysis), "refactor");
    }

    #[test]
    fn description_prefers_focus_area_and_behavior_hint() {
        let analysis = server_refactor_analysis();
        assert_eq!(
            infer_description(&analysis, "refactor", None),
            "refine server request handling"
        );
    }

    #[test]
    fn heuristic_body_reads_like_a_summary() {
        let analysis = server_refactor_analysis();
        let body = build_heuristic_body(&analysis);
        assert_eq!(body.len(), 2);
        assert!(body[0].contains("server"));
        assert!(body[1].contains("adds buildEnvFromProcess"));
        assert!(body[1].contains("src/ (2 files"));
    }

    #[test]
    fn prompt_omits_lockfile_diff_body_but_keeps_structured_summary() {
        let diff = r#"
diff --git a/package.json b/package.json
index b25b17db..d30f02ee 100644
--- a/package.json
+++ b/package.json
@@ -86 +86,2 @@
-    "yaml": "^2.9.0"
+    "yaml": "^2.9.0",
+    "nx": "23.0.1"
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 4916450e..758d7f5e 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -998,0 +1005,6 @@ packages:
+  '@emnapi/runtime@1.4.5':
+    resolution: {integrity: sha512-++LApOtY0pEEz1zrd9vy1/zXVaVJJ/EbAF3u0fXIzPJEDtnITsBGbbK0EkM72amhl/R5b+5xx0Y/QhcVOpuulg==}
+  open@8.4.2:
+    resolution: {integrity: sha512-7x81NCL719oNbsq/3mh+hVrAWmFuEYUqrq/Iw3kUzH8ReypT9QQ0BLoJS7/G9k6N81XjW4qHWtjWwe/9eLy1EQ==}
"#;
        let symbols = summarize_symbols(diff);
        let analysis = WorktreeAnalysis {
            repo_root: PathBuf::from("C:/repo"),
            repo_name: "speedrun-formations".to_string(),
            branch: Some("main".to_string()),
            status_entries: vec![
                StatusEntry {
                    code: "M".to_string(),
                    path: "package.json".to_string(),
                },
                StatusEntry {
                    code: "M".to_string(),
                    path: "pnpm-lock.yaml".to_string(),
                },
            ],
            files: vec![
                FileChangeSummary {
                    path: "package.json".to_string(),
                    status: "modified".to_string(),
                    additions: 4,
                    deletions: 2,
                },
                FileChangeSummary {
                    path: "pnpm-lock.yaml".to_string(),
                    status: "modified".to_string(),
                    additions: 539,
                    deletions: 17,
                },
            ],
            total_additions: 543,
            total_deletions: 19,
            diff_text: diff.to_string(),
            new_functions: symbols.new_functions,
            changed_functions: symbols.changed_functions,
            removed_functions: symbols.removed_functions,
            new_types: symbols.new_types,
            changed_types: symbols.changed_types,
            removed_types: symbols.removed_types,
            hunk_contexts: symbols.hunk_contexts,
        };

        let heuristic = build_heuristic_commit(&analysis, None);
        let prompt = build_commit_prompt(&analysis, None, &heuristic);

        assert!(prompt.contains("pnpm-lock.yaml (+539 -17; lockfile)"));
        assert!(prompt.contains("\"nx\": \"23.0.1\""));
        assert!(prompt.contains("package entries added: @emnapi/runtime@1.4.5"));
        assert!(!prompt.contains("sha512-++LApOtY0pEEz1zrd9vy1"));
        assert!(!prompt.contains("packages:"));
    }

    #[test]
    fn diff_excerpt_reports_when_all_records_are_low_signal() {
        let diff = r#"
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 4916450e..758d7f5e 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -998,0 +1005,2 @@ packages:
+  open@8.4.2:
+    resolution: {integrity: sha512-7x81NCL719oNbsq}
"#;
        let analysis = WorktreeAnalysis {
            repo_root: PathBuf::from("C:/repo"),
            repo_name: "speedrun-formations".to_string(),
            branch: Some("main".to_string()),
            status_entries: Vec::new(),
            files: vec![FileChangeSummary {
                path: "pnpm-lock.yaml".to_string(),
                status: "modified".to_string(),
                additions: 539,
                deletions: 17,
            }],
            total_additions: 539,
            total_deletions: 17,
            diff_text: diff.to_string(),
            new_functions: Vec::new(),
            changed_functions: Vec::new(),
            removed_functions: Vec::new(),
            new_types: Vec::new(),
            changed_types: Vec::new(),
            removed_types: Vec::new(),
            hunk_contexts: Vec::new(),
        };

        let excerpt = build_prompt_diff_excerpt(&analysis);
        assert!(excerpt.excerpt.trim().is_empty());
        assert_eq!(
            excerpt.omitted_files,
            vec!["pnpm-lock.yaml (+539 -17; lockfile)".to_string()]
        );
        assert_eq!(
            excerpt.summaries,
            vec![
                "pnpm-lock.yaml (+539 -17; lockfile)".to_string(),
                "package entries added: open@8.4.2".to_string()
            ]
        );
    }

    #[test]
    fn lockfile_preprocessing_summarizes_repeated_package_churn() {
        let diff = r#"
diff --git a/services/athena-auth/Cargo.lock b/services/athena-auth/Cargo.lock
index 1111111..2222222 100644
--- a/services/athena-auth/Cargo.lock
+++ b/services/athena-auth/Cargo.lock
@@ -10,5 +10,0 @@ name = "aead"
-name = "aead"
-version = "0.5.2"
@@ -20,0 +20,5 @@ name = "aes"
+name = "aes"
+version = "0.8.4"
diff --git a/apps/docs/pnpm-lock.yaml b/apps/docs/pnpm-lock.yaml
index f96b24fc..c3b8250d 100644
--- a/apps/docs/pnpm-lock.yaml
+++ b/apps/docs/pnpm-lock.yaml
@@ -21,2 +21,2 @@ importers:
-        specifier: 16.6.5
-        version: 16.6.5(@types/react@19.2.10)(next@16.1.5(react@19.2.4))
+        specifier: 16.7.13
+        version: 16.7.13(@types/react@19.2.10)(next@16.1.5(react@19.2.4))
@@ -3113,2 +3140,2 @@ packages:
-  fumadocs-core@16.6.5:
-    resolution: {integrity: sha512-old}
+  fumadocs-core@16.7.13:
+    resolution: {integrity: sha512-new}
"#;
        let analysis = WorktreeAnalysis {
            repo_root: PathBuf::from("C:/repo"),
            repo_name: "athena".to_string(),
            branch: Some("main".to_string()),
            status_entries: Vec::new(),
            files: vec![
                FileChangeSummary {
                    path: "services/athena-auth/Cargo.lock".to_string(),
                    status: "modified".to_string(),
                    additions: 3403,
                    deletions: 1366,
                },
                FileChangeSummary {
                    path: "apps/docs/pnpm-lock.yaml".to_string(),
                    status: "modified".to_string(),
                    additions: 131,
                    deletions: 53,
                },
            ],
            total_additions: 3534,
            total_deletions: 1419,
            diff_text: diff.to_string(),
            new_functions: Vec::new(),
            changed_functions: Vec::new(),
            removed_functions: Vec::new(),
            new_types: Vec::new(),
            changed_types: Vec::new(),
            removed_types: Vec::new(),
            hunk_contexts: summarize_symbols(diff).hunk_contexts,
        };

        let prompt = build_commit_prompt(&analysis, None, &build_heuristic_commit(&analysis, None));

        assert!(prompt.contains("services/athena-auth/Cargo.lock (+3403 -1366; lockfile)"));
        assert!(prompt.contains("apps/docs/pnpm-lock.yaml (+131 -53; lockfile)"));
        assert!(prompt.contains("cargo packages added: aes@0.8.4"));
        assert!(prompt.contains("cargo packages removed: aead@0.5.2"));
        assert!(prompt.contains("version shifts: 16.6.5 -> 16.7.13"));
        assert!(prompt.contains("package entries added: fumadocs-core@16.7.13"));
        assert!(!prompt.contains("sha512-old"));
        assert!(!prompt.contains("name = \"aead\""));
        assert!(!prompt.contains("hunk contexts:"));
    }

    #[test]
    fn retained_diff_preprocessing_compacts_repeated_long_lines() {
        let repeated = format!(
            "+        version: 10.3.11({})(tailwindcss@4.1.18)",
            "@types/react@19.2.10".repeat(12)
        );
        let diff = format!(
            "diff --git a/package.json b/package.json\n--- a/package.json\n+++ b/package.json\n@@ -1,0 +1,3 @@\n{0}\n{0}\n+    \"nx\": \"23.0.1\"\n",
            repeated
        );
        let analysis = WorktreeAnalysis {
            repo_root: PathBuf::from("C:/repo"),
            repo_name: "speedrun-formations".to_string(),
            branch: Some("main".to_string()),
            status_entries: Vec::new(),
            files: vec![FileChangeSummary {
                path: "package.json".to_string(),
                status: "modified".to_string(),
                additions: 3,
                deletions: 0,
            }],
            total_additions: 3,
            total_deletions: 0,
            diff_text: diff,
            new_functions: Vec::new(),
            changed_functions: Vec::new(),
            removed_functions: Vec::new(),
            new_types: Vec::new(),
            changed_types: Vec::new(),
            removed_types: Vec::new(),
            hunk_contexts: Vec::new(),
        };

        let excerpt = build_prompt_diff_excerpt(&analysis).excerpt;
        assert!(excerpt.contains("(...peer deps omitted)"));
        assert!(excerpt.contains("duplicate long diff line(s) omitted"));
        assert!(excerpt.contains("\"nx\": \"23.0.1\""));
    }

    #[test]
    fn clean_worktree_message_calls_out_pending_pushes() {
        let repo = RepoContext {
            repo_root: PathBuf::from("C:/repo"),
            repo_name: "xbp".to_string(),
            branch: Some("main".to_string()),
        };
        let message = render_clean_worktree_message(
            &repo,
            &BranchSyncStatus {
                upstream: Some("origin/main".to_string()),
                ahead: 2,
                behind: 0,
            },
        );

        assert!(message.contains("Nothing to commit."));
        assert!(message.contains("2 commit(s) waiting to push"));
        assert!(message.contains("origin/main"));
    }

    #[test]
    fn clean_worktree_message_calls_out_synced_branch() {
        let repo = RepoContext {
            repo_root: PathBuf::from("C:/repo"),
            repo_name: "xbp".to_string(),
            branch: Some("main".to_string()),
        };
        let message = render_clean_worktree_message(
            &repo,
            &BranchSyncStatus {
                upstream: Some("origin/main".to_string()),
                ahead: 0,
                behind: 0,
            },
        );

        assert!(message.contains("Nothing to commit."));
        assert!(message.contains("already in sync"));
    }

    #[test]
    fn detects_nothing_to_commit_git_errors() {
        assert!(looks_like_nothing_to_commit_error(
            "`git commit --file msg.txt` failed: nothing to commit, working tree clean"
        ));
        assert!(looks_like_nothing_to_commit_error(
            "`git commit --file msg.txt` failed: no changes added to commit"
        ));
        assert!(!looks_like_nothing_to_commit_error(
            "`git commit --file msg.txt` failed: pre-commit hook exited with code 1"
        ));
    }

    #[test]
    fn stage_pathspecs_use_changed_paths_and_fall_back_for_renames() {
        let paths = stage_pathspecs(&[
            StatusEntry {
                code: "M".to_string(),
                path: "src/lib.rs".to_string(),
            },
            StatusEntry {
                code: "??".to_string(),
                path: "docs/new.md".to_string(),
            },
            StatusEntry {
                code: "M".to_string(),
                path: "src/lib.rs".to_string(),
            },
        ]);
        assert_eq!(
            paths,
            vec!["docs/new.md".to_string(), "src/lib.rs".to_string()]
        );

        let rename_paths = stage_pathspecs(&[StatusEntry {
            code: "R".to_string(),
            path: "old.rs -> new.rs".to_string(),
        }]);
        assert!(rename_paths.is_empty());
    }

    #[test]
    fn large_worktree_pathspecs_use_bulk_add_to_avoid_windows_argv_truncation() {
        // Staging always uses bulk `git add --all` so large worktrees never build an
        // argv that Windows CreateProcess truncates mid-pathspec.
        let long_paths: Vec<String> = (0..437)
            .map(|i| {
                format!(
                    "foundry/instagram-downloads/100500818017217/messages/audio_attachments/{:04}.mp3",
                    i
                )
            })
            .collect();

        assert!(pathspecs_exceed_safe_argv_budget(&long_paths));
        assert!(long_paths.len() > SAFE_GIT_PATHSPEC_COUNT);

        let strategy = choose_stage_strategy(&long_paths, &[]);
        assert_eq!(
            strategy,
            StageStrategy::BulkAddAll {
                path_count: long_paths.len()
            }
        );

        let small = vec!["src/lib.rs".to_string(), "README.md".to_string()];
        assert!(!pathspecs_exceed_safe_argv_budget(&small));
        assert_eq!(
            choose_stage_strategy(&small, &[]),
            StageStrategy::BulkAddAll { path_count: 2 }
        );
        assert_eq!(
            choose_stage_strategy(&small, &["terminals/5.txt".to_string()]),
            StageStrategy::BulkAddAll { path_count: 2 }
        );
        assert_eq!(
            choose_stage_strategy(&[], &[]),
            StageStrategy::BulkAddAll { path_count: 0 }
        );

        let almost_budget = vec!["a".repeat(SAFE_GIT_ARGV_CHAR_BUDGET)];
        assert!(pathspecs_exceed_safe_argv_budget(&almost_budget));
    }

    #[test]
    fn porcelain_status_preserves_dot_prefixed_paths_and_leading_status_space() {
        // Regression: `git_output` used to `.trim()` the whole status blob, turning
        // ` M .xbp/foo` into `M .xbp/foo` and then parse_status_entries into path
        // `xbp/foo` (leading `.` eaten as the XY separator column).
        let raw =
            " M .xbp/releases/service-dexter-sentinel/1.4.0.yaml\n?? src/bin/dexter-import.rs\n";
        let entries = parse_status_entries(raw);
        assert_eq!(entries.len(), 2);
        assert_eq!(entries[0].code, "M");
        assert_eq!(
            entries[0].path,
            ".xbp/releases/service-dexter-sentinel/1.4.0.yaml"
        );
        assert_eq!(entries[1].code, "??");
        assert_eq!(entries[1].path, "src/bin/dexter-import.rs");

        // Simulate the historical full-string trim bug.
        let corrupted = raw.trim();
        let broken = parse_status_entries(corrupted);
        assert_eq!(
            broken[0].path, "xbp/releases/service-dexter-sentinel/1.4.0.yaml",
            "documenting the failure mode that full trim() produces"
        );
    }

    #[test]
    fn git_error_args_are_truncated_for_readable_failures() {
        let many: Vec<String> = (0..80).map(|i| format!("path/to/file-{i}.bin")).collect();
        let refs: Vec<&str> = many.iter().map(String::as_str).collect();
        let mut args = vec!["add", "--all", "--"];
        args.extend(refs.iter().copied());

        let display = format_git_args_for_error(&args);
        assert!(display.contains("truncated for display"));
        assert!(display.len() < 400);
        assert!(!display.contains("path/to/file-79.bin") || display.contains("…"));
    }

    #[tokio::test]
    async fn stage_commit_paths_bulk_add_respects_gitignore_and_excludes() {
        let root =
            std::env::temp_dir().join(format!("xbp-commit-stage-test-{}", uuid::Uuid::new_v4()));
        let _ = std::fs::remove_dir_all(&root);
        std::fs::create_dir_all(&root).expect("temp root");

        let git = |args: &[&str]| {
            std::process::Command::new("git")
                .current_dir(&root)
                .args(args)
                .output()
                .expect("git")
        };

        assert!(git(&["init"]).status.success());
        assert!(git(&["config", "user.email", "test@example.com"])
            .status
            .success());
        assert!(git(&["config", "user.name", "Test"]).status.success());
        // Avoid platform-specific default branch surprises in CI.
        let _ = git(&["checkout", "-b", "main"]);

        std::fs::write(root.join(".gitignore"), "ignored-dir/\n*.tmp\n").unwrap();
        std::fs::write(root.join("keep.rs"), "fn main() {}\n").unwrap();
        std::fs::create_dir_all(root.join("ignored-dir")).unwrap();
        std::fs::write(root.join("ignored-dir/secret.bin"), "nope").unwrap();
        std::fs::write(root.join("noise.tmp"), "tmp").unwrap();
        std::fs::create_dir_all(root.join("terminals")).unwrap();
        std::fs::write(root.join("terminals/session.txt"), "session").unwrap();

        // Seed an initial commit so reset HEAD works for excludes.
        assert!(git(&["add", ".gitignore", "keep.rs"]).status.success());
        assert!(git(&["commit", "-m", "init"]).status.success());

        std::fs::write(root.join("keep.rs"), "fn main() { /* changed */ }\n").unwrap();
        std::fs::write(root.join("feature.rs"), "pub fn f() {}\n").unwrap();
        std::fs::write(root.join("ignored-dir/secret.bin"), "still ignored").unwrap();
        std::fs::write(root.join("noise.tmp"), "still tmp").unwrap();
        std::fs::write(root.join("terminals/session.txt"), "session v2").unwrap();

        let status_entries = vec![
            StatusEntry {
                code: " M".to_string(),
                path: "keep.rs".to_string(),
            },
            StatusEntry {
                code: "??".to_string(),
                path: "feature.rs".to_string(),
            },
            StatusEntry {
                code: "??".to_string(),
                path: "terminals/session.txt".to_string(),
            },
        ];

        // Build a path list large enough that the strategy chooses bulk add.
        let mut bloated_status = status_entries.clone();
        for i in 0..100 {
            bloated_status.push(StatusEntry {
                code: "??".to_string(),
                path: format!(
                    "foundry/instagram-downloads/user/messages/audio_attachments/{:04}.mp3",
                    i
                ),
            });
        }

        super::stage_commit_paths(
            &root,
            &bloated_status,
            &["terminals/session.txt".to_string()],
        )
        .await
        .expect("stage should succeed without pathspec truncation");

        let cached = git(&["diff", "--cached", "--name-only"]);
        assert!(cached.status.success());
        let staged = String::from_utf8_lossy(&cached.stdout).replace('\\', "/");
        assert!(
            staged.contains("keep.rs"),
            "expected keep.rs staged, got:\n{}",
            staged
        );
        assert!(
            staged.contains("feature.rs"),
            "expected feature.rs staged, got:\n{}",
            staged
        );
        assert!(
            !staged.contains("ignored-dir"),
            "gitignore paths must not be staged:\n{}",
            staged
        );
        assert!(
            !staged.contains("noise.tmp"),
            "*.tmp gitignore must not be staged:\n{}",
            staged
        );
        assert!(
            !staged.contains("terminals/session.txt"),
            "excluded terminal path must stay unstaged:\n{}",
            staged
        );

        // check-ignore filter drops untracked ignored paths when they appear in status.
        let filtered = super::filter_gitignored_status_entries(
            &root,
            vec![
                StatusEntry {
                    code: "??".to_string(),
                    path: "feature.rs".to_string(),
                },
                StatusEntry {
                    code: "??".to_string(),
                    path: "noise.tmp".to_string(),
                },
                StatusEntry {
                    code: "??".to_string(),
                    path: "ignored-dir/secret.bin".to_string(),
                },
                StatusEntry {
                    code: " M".to_string(),
                    path: "keep.rs".to_string(),
                },
            ],
        )
        .await
        .expect("filter");

        let filtered_paths: Vec<&str> = filtered.iter().map(|e| e.path.as_str()).collect();
        assert_eq!(filtered_paths, vec!["feature.rs", "keep.rs"]);

        let _ = std::fs::remove_dir_all(&root);
    }

    #[test]
    fn scope_sanitizer_keeps_valid_tokens() {
        assert_eq!(
            sanitize_scope(Some("CLI/tools")),
            Some("cli/tools".to_string())
        );
        assert_eq!(sanitize_scope(Some("  ")), None);
    }

    #[test]
    fn terminal_session_paths_are_detected_and_blocked() {
        let analysis = WorktreeAnalysis {
            repo_root: PathBuf::from("C:/repo"),
            repo_name: "xbp".to_string(),
            branch: Some("main".to_string()),
            status_entries: Vec::new(),
            files: vec![
                FileChangeSummary {
                    path: "terminals/5.txt".to_string(),
                    status: "added".to_string(),
                    additions: 388_613,
                    deletions: 0,
                },
                FileChangeSummary {
                    path: "terminals/.next-id".to_string(),
                    status: "modified".to_string(),
                    additions: 1,
                    deletions: 1,
                },
            ],
            total_additions: 388_614,
            total_deletions: 1,
            diff_text: String::new(),
            new_functions: Vec::new(),
            changed_functions: Vec::new(),
            removed_functions: Vec::new(),
            new_types: Vec::new(),
            changed_types: Vec::new(),
            removed_types: Vec::new(),
            hunk_contexts: Vec::new(),
        };

        assert!(is_terminal_session_path("terminals/5.txt"));
        assert!(!is_terminal_session_path(
            "crates/cli/src/commands/commit.rs"
        ));
        assert_eq!(
            terminal_session_paths(&analysis),
            vec![
                "terminals/5.txt".to_string(),
                "terminals/.next-id".to_string()
            ]
        );
        assert!(
            render_terminal_session_block_message(&terminal_session_paths(&analysis))
                .contains("Refusing to commit IDE terminal session dumps")
        );
        assert_eq!(infer_commit_type(&analysis), "chore");
        assert_eq!(
            infer_description(&analysis, "chore", None),
            "ignore ide terminal session logs"
        );

        let heuristic = build_heuristic_commit(&analysis, None);
        assert_eq!(heuristic.commit_type, "chore");
        assert_eq!(heuristic.description, "ignore ide terminal session logs");
        assert!(!render_commit_message(&heuristic).contains("flow"));
    }

    #[test]
    fn focus_area_groups_terminal_session_files() {
        assert_eq!(
            describe_focus_area("terminals/5.txt"),
            Some("terminals".to_string())
        );
        assert_eq!(
            describe_focus_area("terminals/.next-id"),
            Some("terminals".to_string())
        );
        assert_eq!(
            describe_focus_area(".gitignore"),
            Some("gitignore".to_string())
        );
    }

    #[test]
    fn summarize_focus_areas_collapses_terminal_logs() {
        let analysis = WorktreeAnalysis {
            repo_root: PathBuf::from("C:/repo"),
            repo_name: "xbp".to_string(),
            branch: Some("main".to_string()),
            status_entries: Vec::new(),
            files: vec![
                FileChangeSummary {
                    path: "terminals/5.txt".to_string(),
                    status: "deleted".to_string(),
                    additions: 0,
                    deletions: 388_613,
                },
                FileChangeSummary {
                    path: "terminals/3.txt".to_string(),
                    status: "deleted".to_string(),
                    additions: 0,
                    deletions: 439,
                },
                FileChangeSummary {
                    path: "terminals/.next-id".to_string(),
                    status: "modified".to_string(),
                    additions: 0,
                    deletions: 1,
                },
                FileChangeSummary {
                    path: ".gitignore".to_string(),
                    status: "modified".to_string(),
                    additions: 1,
                    deletions: 0,
                },
            ],
            total_additions: 1,
            total_deletions: 389_053,
            diff_text: String::new(),
            new_functions: Vec::new(),
            changed_functions: Vec::new(),
            removed_functions: Vec::new(),
            new_types: Vec::new(),
            changed_types: Vec::new(),
            removed_types: Vec::new(),
            hunk_contexts: Vec::new(),
        };

        assert_eq!(
            summarize_focus_areas(&analysis, 4),
            vec!["terminals".to_string(), "gitignore".to_string()]
        );
        assert_eq!(
            summarize_top_files(&analysis, 4),
            vec![
                "terminals/ (3 files, +0 -389053)".to_string(),
                ".gitignore (+1 -0)".to_string(),
            ]
        );
    }
}