truth-mirror 0.9.0

//! Read-only repository status and wiring diagnostics.

use std::{
    fs,
    path::{Component, Path, PathBuf},
    process::{Command, ExitCode},
};

use anyhow::{Context, Result};

use crate::{
    cli,
    hooks::{FORWARDER_NAME, FORWARDER_SOURCE, MANAGED_MARKER},
    ledger::LedgerStore,
    provenance,
    reviewer::{ReviewQueue, ReviewRunStore},
};

const HOOKS: &[&str] = &["commit-msg", "post-commit", "pre-push"];

pub fn run(_args: cli::StatusArgs, state_dir: &Path) -> Result<ExitCode> {
    let repo_root = git_root().context("this command requires a Git repository")?;
    let resolved_state_dir = repo_relative_path(&repo_root, state_dir);
    let hook_status = inspect_hook_status(&repo_root, state_dir);
    let queue = ReviewQueue::new(&resolved_state_dir).summary();
    let run_counts = ReviewRunStore::new(&resolved_state_dir).status_counts();
    // The status line must report the same set that blocks pre-push and
    // reinjection (open REJECTs + needs-human escalations) — the narrower
    // unresolved set could say "0" while the next push is refused.
    let blocking = LedgerStore::new(&resolved_state_dir).blocking_rejections();

    println!("repo: {}", repo_root.display());
    match hook_status {
        Ok(hook_status) => {
            println!("hook_mode: {}", hook_status.mode);
            for hook in hook_status.hooks {
                let state = if hook.installed {
                    "installed"
                } else {
                    "missing"
                };
                println!("hook {}: {} path={}", hook.name, state, hook.path.display());
            }
        }
        Err(error) => println!(
            "hook_mode: unavailable warning={}",
            single_line_error(error.as_ref())
        ),
    }

    match queue {
        Ok(queue) => {
            let oldest = queue
                .oldest_age_secs_at(crate::time::unix_now())
                .map_or_else(|| "none".to_owned(), |age| format!("{age}s"));
            println!("queue: pending={} oldest_age={oldest}", queue.pending_count);
        }
        Err(error) => println!("queue: unavailable warning={}", single_line_error(&error)),
    }

    match run_counts {
        Ok(run_counts) => {
            let warning = if run_counts.skipped_records == 0 {
                String::new()
            } else {
                format!(" warning=skipped_records:{}", run_counts.skipped_records)
            };
            println!(
                "review_runs: queued={} running={} completed={} failed={} cancelled={}{}",
                run_counts.queued,
                run_counts.running,
                run_counts.completed,
                run_counts.failed,
                run_counts.cancelled,
                warning
            );
        }
        Err(error) => println!(
            "review_runs: unavailable warning={}",
            single_line_error(&error)
        ),
    }
    println!("review_run_liveness: not_reconciled_read_only");
    match blocking {
        Ok(entries) => {
            let needs_human = entries
                .iter()
                .filter(|entry| entry.is_needs_human())
                .count();
            println!(
                "ledger: blocking_rejections={} (needs_human={})",
                entries.len(),
                needs_human
            );
        }
        Err(error) => println!("ledger: unavailable warning={}", single_line_error(&error)),
    }

    if let Ok(head) = git_stdout(&repo_root, &["rev-parse", "HEAD"])
        && let Some(checkpoint) = provenance::entire_checkpoint_for_commit(&repo_root, head.trim())
    {
        println!(
            "entire: ref={} sha={}",
            checkpoint.ref_name, checkpoint.object_sha
        );
    } else {
        println!("entire: none (optional)");
    }

    Ok(ExitCode::SUCCESS)
}

struct HookStatus {
    mode: &'static str,
    hooks: Vec<HookProbe>,
}

struct HookProbe {
    name: &'static str,
    path: PathBuf,
    installed: bool,
}

fn inspect_hook_status(repo_root: &Path, state_dir: &Path) -> Result<HookStatus> {
    let mode = detect_hook_mode(repo_root, state_dir)?;
    let hooks = HOOKS
        .iter()
        .map(|hook| {
            let path = active_hook_path(repo_root, &mode, hook)?;
            let installed = hook_is_live_truth_mirror(repo_root, &path, hook, &mode);
            Ok(HookProbe {
                name: hook,
                path,
                installed,
            })
        })
        .collect::<Result<Vec<_>>>()?;

    Ok(HookStatus {
        mode: mode.as_str(),
        hooks,
    })
}

enum StatusHookMode {
    Plain,
    LegacyTruthMirror {
        hooks_path: PathBuf,
    },
    Husky {
        content_dir: PathBuf,
        entry_dir: PathBuf,
    },
    Custom {
        hooks_path: PathBuf,
    },
}

impl StatusHookMode {
    fn as_str(&self) -> &'static str {
        match self {
            Self::Plain => "plain",
            Self::LegacyTruthMirror { .. } => "plain-legacy-truth-mirror",
            Self::Husky { .. } => "husky",
            Self::Custom { .. } => "custom-committed",
        }
    }
}

fn detect_hook_mode(repo_root: &Path, state_dir: &Path) -> Result<StatusHookMode> {
    let Some(configured) = git_config_get(repo_root, "core.hooksPath")? else {
        return Ok(StatusHookMode::Plain);
    };
    let configured = configured.trim();
    if configured.is_empty() {
        return Ok(StatusHookMode::Plain);
    }
    let hooks_path = repo_relative_path(repo_root, Path::new(configured));
    if is_managed_hooks_path(repo_root, state_dir, configured) {
        return Ok(StatusHookMode::LegacyTruthMirror { hooks_path });
    }
    if configured.contains(".husky") {
        let content_dir = if hooks_path.file_name().and_then(|name| name.to_str()) == Some("_") {
            hooks_path
                .parent()
                .map_or_else(|| repo_root.join(".husky"), Path::to_path_buf)
        } else {
            hooks_path.clone()
        };
        return Ok(StatusHookMode::Husky {
            content_dir,
            entry_dir: hooks_path,
        });
    }
    Ok(StatusHookMode::Custom { hooks_path })
}

fn active_hook_path(repo_root: &Path, mode: &StatusHookMode, hook: &str) -> Result<PathBuf> {
    match mode {
        StatusHookMode::Plain => {
            let path = git_stdout(
                repo_root,
                &["rev-parse", "--git-path", &format!("hooks/{hook}")],
            )?;
            Ok(repo_relative_path(repo_root, Path::new(path.trim())))
        }
        StatusHookMode::LegacyTruthMirror { hooks_path } => Ok(hooks_path.join(hook)),
        StatusHookMode::Husky { content_dir, .. } => Ok(content_dir.join(hook)),
        StatusHookMode::Custom { hooks_path } => Ok(hooks_path.join(hook)),
    }
}

fn hook_is_live_truth_mirror(
    repo_root: &Path,
    path: &Path,
    hook: &str,
    mode: &StatusHookMode,
) -> bool {
    if let StatusHookMode::Custom { hooks_path } = mode {
        return custom_hook_forwards_to_local(repo_root, hooks_path, path, hook);
    }

    if let StatusHookMode::Husky {
        content_dir,
        entry_dir,
    } = mode
    {
        let content_is_active_entry = entry_dir == content_dir;
        let content_hook_is_live = if !content_is_active_entry
            && husky_entry_runs_content_hook_with_shell(entry_dir, content_dir, hook)
        {
            truth_mirror_hook_content_is_live(path, hook)
        } else {
            direct_truth_mirror_hook_is_live(path, hook)
        };
        return content_hook_is_live
            && (content_is_active_entry
                || husky_entry_forwards_to_content(entry_dir, content_dir, hook));
    }

    direct_truth_mirror_hook_is_live(path, hook)
}

fn direct_truth_mirror_hook_is_live(path: &Path, hook: &str) -> bool {
    hook_is_executable_with_content(path, |content| {
        hook_content_installs_truth_mirror(content, hook, &StatusHookMode::Plain)
    })
}

fn truth_mirror_hook_content_is_live(path: &Path, hook: &str) -> bool {
    fs::read_to_string(path).is_ok_and(|content| {
        hook_content_installs_truth_mirror(&content, hook, &StatusHookMode::Plain)
    })
}

fn hook_is_executable_with_content(path: &Path, predicate: impl FnOnce(&str) -> bool) -> bool {
    is_executable_file(path) && fs::read_to_string(path).is_ok_and(|content| predicate(&content))
}

fn hook_content_installs_truth_mirror(content: &str, hook: &str, mode: &StatusHookMode) -> bool {
    match mode {
        StatusHookMode::Custom { .. } => {
            content.contains(MANAGED_MARKER)
                && content.contains(FORWARDER_NAME)
                && content.contains(hook)
        }
        StatusHookMode::Plain
        | StatusHookMode::LegacyTruthMirror { .. }
        | StatusHookMode::Husky { .. } => {
            active_hook_lines(content).any(|line| line_invokes_truth_hook_dispatch(line, hook))
        }
    }
}

fn active_hook_lines(content: &str) -> impl Iterator<Item = &str> {
    content
        .lines()
        .map(str::trim_start)
        .filter(|line| !line.trim().is_empty() && !line.starts_with('#'))
}

fn line_invokes_truth_hook_dispatch(line: &str, hook: &str) -> bool {
    crate::shell::shellish_token_segments(line)
        .iter()
        .any(|tokens| token_segment_invokes_truth_hook_dispatch(tokens, hook))
}

fn token_segment_invokes_truth_hook_dispatch(tokens: &[&str], hook: &str) -> bool {
    for (index, token) in tokens.iter().enumerate() {
        if !is_truth_binary(token) {
            continue;
        }
        let Some(dispatch_offset) = tokens[index + 1..]
            .iter()
            .position(|candidate| *candidate == "hook-dispatch")
        else {
            continue;
        };
        let hook_index = index + 1 + dispatch_offset + 1;
        if tokens
            .get(hook_index)
            .is_some_and(|candidate| *candidate == hook)
        {
            return true;
        }
    }
    false
}

fn is_truth_binary(token: &str) -> bool {
    token == "truth"
        || token == "truth-mirror"
        || token.ends_with("/truth")
        || token.ends_with("/truth-mirror")
}

fn custom_forwarder_helper_is_live(hooks_path: &Path) -> bool {
    hook_is_executable_with_content(&hooks_path.join(FORWARDER_NAME), |content| {
        content == FORWARDER_SOURCE
    })
}

fn custom_hook_forwards_to_local(
    repo_root: &Path,
    hooks_path: &Path,
    path: &Path,
    hook: &str,
) -> bool {
    if direct_truth_mirror_hook_is_live(path, hook) {
        return true;
    }
    let active_forwards = hook_is_executable_with_content(path, |content| {
        if hook_content_installs_truth_mirror(
            content,
            hook,
            &StatusHookMode::Custom {
                hooks_path: hooks_path.to_path_buf(),
            },
        ) {
            return custom_forwarder_helper_is_live(hooks_path);
        }
        content_forwards_to_local_git_hook(content, hook)
    });
    active_forwards
        && forwarded_local_hook_path(repo_root, hook)
            .is_ok_and(|local_hook| direct_truth_mirror_hook_is_live(&local_hook, hook))
}

fn content_forwards_to_local_git_hook(content: &str, hook: &str) -> bool {
    let resolves_git_dir =
        content.contains("--git-common-dir") || content.contains("git rev-parse --git-common-dir");
    resolves_git_dir
        && active_hook_lines(content).any(|line| {
            line.contains("$@")
                && (line.contains(&format!("hooks/{hook}"))
                    || line.contains("hooks/$name")
                    || line.contains("hooks/${name}")
                    || line.contains("hooks/$hook")
                    || line.contains("hooks/${hook}"))
        })
}

fn husky_entry_forwards_to_content(entry_dir: &Path, content_dir: &Path, hook: &str) -> bool {
    let entry = entry_dir.join(hook);
    hook_is_executable_with_content(&entry, |content| {
        if content_mentions_husky_content_hook(content, hook) {
            return true;
        }
        if content_mentions_husky_helper(content) {
            return husky_helper_forwards_to_content(
                entry_dir,
                content_dir,
                !content_sources_husky_helper(content),
            );
        }
        false
    })
}

fn husky_entry_runs_content_hook_with_shell(
    entry_dir: &Path,
    content_dir: &Path,
    hook: &str,
) -> bool {
    let entry = entry_dir.join(hook);
    hook_is_executable_with_content(&entry, |content| {
        if content_mentions_husky_helper(content) {
            return husky_helper_runs_content_hook_with_shell(
                entry_dir,
                content_dir,
                !content_sources_husky_helper(content),
            );
        }
        false
    })
}

fn husky_helper_forwards_to_content(
    entry_dir: &Path,
    content_dir: &Path,
    require_executable: bool,
) -> bool {
    if normalize_path(&entry_dir.join("..")) != normalize_path(content_dir) {
        return false;
    }
    let helper = entry_dir.join("h");
    if require_executable && !is_executable_file(&helper) {
        return false;
    }
    fs::read_to_string(helper).is_ok_and(|content| {
        let active_content = active_hook_lines(&content).collect::<Vec<_>>().join("\n");
        let names_active_hook = active_content.contains("hook_name")
            || active_content.contains("basename \"$0\"")
            || active_content.contains("${0##*/}");
        let targets_parent_hook = active_content.contains("content_dir")
            || active_content.contains("dirname \"$(dirname \"$0\")\"")
            || active_content.contains("${0%/*/*}");
        names_active_hook && targets_parent_hook && active_content.contains("\"$@\"")
    })
}

fn husky_helper_runs_content_hook_with_shell(
    entry_dir: &Path,
    content_dir: &Path,
    require_executable: bool,
) -> bool {
    if !husky_helper_forwards_to_content(entry_dir, content_dir, require_executable) {
        return false;
    }
    fs::read_to_string(entry_dir.join("h")).is_ok_and(|content| {
        active_hook_lines(&content).any(|line| {
            line.contains("sh -e ") || line.contains("sh \"$") || line.contains("sh '$")
        })
    })
}

fn content_mentions_husky_helper(content: &str) -> bool {
    active_hook_lines(content).any(|line| line.contains("/h\"") || line.contains("/h'"))
}

fn content_sources_husky_helper(content: &str) -> bool {
    active_hook_lines(content)
        .any(|line| line.starts_with(". ") && (line.contains("/h\"") || line.contains("/h'")))
}

fn content_mentions_husky_content_hook(content: &str, hook: &str) -> bool {
    active_hook_lines(content)
        .any(|line| line.contains(&format!("/{hook}\"")) || line.contains(&format!("/{hook}'")))
}

fn forwarded_local_hook_path(repo_root: &Path, hook: &str) -> Result<PathBuf> {
    let git_dir = git_stdout(repo_root, &["rev-parse", "--git-common-dir"])?;
    Ok(repo_relative_path(repo_root, Path::new(git_dir.trim()))
        .join("hooks")
        .join(hook))
}

fn single_line_error(error: &dyn std::error::Error) -> String {
    error.to_string().replace(['\r', '\n'], " ")
}

#[cfg(unix)]
fn is_executable_file(path: &Path) -> bool {
    use std::os::unix::fs::PermissionsExt;

    fs::metadata(path)
        .is_ok_and(|metadata| metadata.is_file() && metadata.permissions().mode() & 0o111 != 0)
}

#[cfg(not(unix))]
fn is_executable_file(path: &Path) -> bool {
    path.is_file()
}

fn repo_relative_path(repo_root: &Path, path: &Path) -> PathBuf {
    if path.is_absolute() {
        path.to_path_buf()
    } else {
        repo_root.join(path)
    }
}

fn is_managed_hooks_path(repo_root: &Path, state_dir: &Path, configured: &str) -> bool {
    let configured_path = normalize_path(&repo_relative_path(repo_root, Path::new(configured)));
    [
        state_dir.join("hooks"),
        PathBuf::from(crate::config::DEFAULT_STATE_DIR).join("hooks"),
        PathBuf::from(crate::config::LEGACY_STATE_DIR).join("hooks"),
    ]
    .iter()
    .any(|candidate| normalize_path(&repo_relative_path(repo_root, candidate)) == configured_path)
}

fn normalize_path(path: &Path) -> PathBuf {
    let mut normalized = PathBuf::new();
    for component in path.components() {
        match component {
            Component::CurDir => {}
            Component::ParentDir => {
                if normalized.as_os_str().is_empty()
                    || (!normalized.has_root() && normalized.ends_with(".."))
                {
                    normalized.push("..");
                } else {
                    normalized.pop();
                }
            }
            Component::Normal(part) => normalized.push(part),
            Component::RootDir | Component::Prefix(_) => normalized.push(component.as_os_str()),
        }
    }
    normalized
}

fn git_root() -> Result<PathBuf> {
    Ok(PathBuf::from(
        git_stdout(Path::new("."), &["rev-parse", "--show-toplevel"])?.trim(),
    ))
}

fn git_config_get(repo_root: &Path, key: &str) -> Result<Option<String>> {
    let output = Command::new("git")
        .args(["config", "--get", key])
        .current_dir(repo_root)
        .output()?;
    if output.status.success() {
        return Ok(Some(String::from_utf8_lossy(&output.stdout).into_owned()));
    }
    if output.status.code() == Some(1) {
        return Ok(None);
    }
    anyhow::bail!(
        "git config --get {key} failed: {}",
        String::from_utf8_lossy(&output.stderr)
    );
}

fn git_stdout(repo_root: &Path, args: &[&str]) -> Result<String> {
    let output = Command::new("git")
        .args(args)
        .current_dir(repo_root)
        .output()?;
    if !output.status.success() {
        anyhow::bail!(
            "git {} failed: {}",
            args.join(" "),
            String::from_utf8_lossy(&output.stderr)
        );
    }
    Ok(String::from_utf8_lossy(&output.stdout).into_owned())
}

#[cfg(test)]
mod tests {
    use std::path::{Path, PathBuf};

    #[test]
    fn normalize_path_preserves_unmatched_relative_parents() {
        assert_eq!(
            super::normalize_path(Path::new("../hooks")),
            PathBuf::from("../hooks")
        );
        assert_eq!(
            super::normalize_path(Path::new("a/../../hooks")),
            PathBuf::from("../hooks")
        );
    }
}