import { execFile } from "node:child_process";
import { promisify } from "node:util";

const execFileAsync = promisify(execFile);

export async function worktreeDiff(worktree: string): Promise<string> {
  await execFileAsync("git", ["add", "-A"], { cwd: worktree });
  const { stdout } = await execFileAsync("git", ["diff", "--cached", "--binary"], { cwd: worktree, encoding: "utf8", maxBuffer: 4 * 1024 * 1024 });
  return stdout;
}

export async function worktreeChangedPaths(worktree: string): Promise<string[]> {
  await execFileAsync("git", ["add", "-A"], { cwd: worktree });
  const { stdout } = await execFileAsync("git", ["diff", "--cached", "--name-only", "-z"], { cwd: worktree, encoding: "utf8", maxBuffer: 1024 * 1024 });
  return stdout.split("\0").filter(Boolean);
}

export async function integrateReviewedDiff(repo: string, patch: string, approved: boolean): Promise<void> {
  if (!approved) throw new Error("Integration requires explicit review approval");
  if (!patch.trim()) return;
  await new Promise<void>((resolvePromise, reject) => {
    const child = execFile("git", ["apply", "--index", "-"], { cwd: repo }, (error) => error ? reject(error) : resolvePromise());
    child.stdin?.end(patch);
  });
}