ai-dispatch 9.7.0

// Worktree state helpers shared by create/reuse flows.
// Exports: git/worktree lookup, lock-file helpers, branch/file inspection.
// Deps: anyhow, std::fs, std::path, std::process::Command.

use anyhow::{Context, Result};
use std::path::{Path, PathBuf};
use std::process::Command;
use super::{path::main_working_tree_dir, validation::canonical_worktree_path};

pub fn sync_cargo_lock(repo_dir: &Path, wt_path: &Path) {
    let src = repo_dir.join("Cargo.lock");
    let dst = wt_path.join("Cargo.lock");
    if src.exists() {
        let _ = std::fs::copy(&src, &dst);
    }
}

pub fn prune_worktrees(repo_dir: &Path) -> Result<()> {
    let prune_status = Command::new("git")
        .args(["-C", &repo_dir.to_string_lossy(), "worktree", "prune"])
        .status()
        .context("Failed to run git worktree prune")?;
    anyhow::ensure!(prune_status.success(), "git worktree prune failed");
    Ok(())
}

pub fn existing_worktree_path(repo_dir: &Path, branch: &str) -> Result<Option<PathBuf>> {
    let caller_checkout = repo_dir
        .canonicalize()
        .with_context(|| format!("failed to canonicalize repo path {}", repo_dir.display()))?;
    let main_checkout = main_working_tree_dir(repo_dir)?
        .canonicalize()
        .with_context(|| format!("failed to canonicalize main checkout for {}", repo_dir.display()))?;
    let out = Command::new("git")
        .args(["-C", &repo_dir.to_string_lossy()])
        .args(["worktree", "list", "--porcelain"])
        .output()
        .context("Failed to run git worktree list")?;
    anyhow::ensure!(
        out.status.success(),
        "git worktree list failed: {}",
        String::from_utf8_lossy(&out.stderr)
    );

    let mut current_path = None;
    for line in String::from_utf8_lossy(&out.stdout).lines() {
        if let Some(path) = line.strip_prefix("worktree ") {
            current_path = Some(PathBuf::from(path.trim()));
            continue;
        }
        if line.trim().is_empty() {
            current_path = None;
            continue;
        }
        if let (Some(path), Some(branch_line)) =
            (current_path.as_ref(), line.strip_prefix("branch "))
        {
            let branch_name = branch_line
                .trim()
                .strip_prefix("refs/heads/")
                .unwrap_or(branch_line.trim());
            let candidate = canonical_worktree_path(path);
            if branch_name == branch && candidate != caller_checkout && candidate != main_checkout {
                return Ok(Some(path.clone()));
            }
        }
    }

    Ok(None)
}

pub fn local_branch_exists(repo_dir: &Path, branch: &str) -> Result<bool> {
    let status = Command::new("git")
        .args([
            "-C",
            &repo_dir.to_string_lossy(),
            "rev-parse",
            "--verify",
            &format!("refs/heads/{branch}"),
        ])
        .stdout(std::process::Stdio::null())
        .stderr(std::process::Stdio::null())
        .status()
        .context("Failed to run git rev-parse")?;
    Ok(status.success())
}

pub(crate) fn branch_tip_resume_base(repo_dir: &Path, branch: &str) -> Result<Option<String>> {
    Ok(local_branch_exists(repo_dir, branch)?.then(|| branch.to_string()))
}

pub fn branch_has_commits_ahead_of_main(repo_dir: &Path, branch: &str) -> Result<bool> {
    super::validate_git_repo(repo_dir)?;
    let status = Command::new("git")
        .args([
            "-C",
            &repo_dir.to_string_lossy(),
            "rev-parse",
            "--verify",
            branch,
        ])
        .stdout(std::process::Stdio::null())
        .stderr(std::process::Stdio::null())
        .status()
        .context("Failed to run git")?;
    if !status.success() {
        return Ok(false);
    }

    let out = Command::new("git")
        .args([
            "-C",
            &repo_dir.to_string_lossy(),
            "rev-list",
            "--count",
            &format!("main..{branch}"),
        ])
        .output()
        .context("Failed to run git rev-list")?;
    if !out.status.success() {
        return Ok(false);
    }
    Ok(String::from_utf8_lossy(&out.stdout)
        .trim()
        .parse::<u32>()
        .unwrap_or(0)
        > 0)
}

pub fn worktree_changed_files(wt_path: &Path) -> Result<Vec<String>> {
    let repo = wt_path.to_string_lossy().to_string();
    let range = if commits_ahead_of_main(&repo).unwrap_or(0) > 1 {
        "main..HEAD"
    } else {
        "HEAD~1..HEAD"
    };
    let out = Command::new("git")
        .args(["-C", &repo, "diff", "--name-only", range])
        .output()
        .context("Failed to run git diff --name-only")?;
    anyhow::ensure!(
        out.status.success(),
        "git diff failed: {}",
        String::from_utf8_lossy(&out.stderr)
    );
    let files = String::from_utf8_lossy(&out.stdout)
        .lines()
        .map(str::trim)
        .filter(|line| !line.is_empty())
        .map(ToString::to_string)
        .collect();
    Ok(files)
}

pub fn process_alive_check(pid: u32) -> bool {
    process_alive(pid)
}

#[cfg(unix)]
pub(super) fn process_alive(pid: u32) -> bool {
    unsafe { libc::kill(pid as i32, 0) == 0 }
}

#[cfg(not(unix))]
pub(super) fn process_alive(_pid: u32) -> bool {
    false
}

fn commits_ahead_of_main(repo: &str) -> Option<u32> {
    let out = Command::new("git")
        .args(["-C", repo, "rev-list", "--count", "main..HEAD"])
        .output()
        .ok()?;
    if !out.status.success() {
        return None;
    }
    let output = String::from_utf8_lossy(&out.stdout);
    let trimmed = output.trim();
    trimmed.parse::<u32>().ok()
}