// mp-sync 公共函数(Node 24 / Deno 2 均可运行,无第三方依赖)
import { execFileSync } from "node:child_process";
import { createHash } from "node:crypto";
import { existsSync, readdirSync, readFileSync, statSync } from "node:fs";
import { dirname, join, relative, resolve } from "node:path";
import { fileURLToPath } from "node:url";

export const ROOT = resolve(dirname(fileURLToPath(import.meta.url)), "../..");
export const LEDGER_PATH = join(ROOT, "scripts/mp-sync/ledger.json");
export const MANUAL_PATH = join(ROOT, "scripts/mp-sync/ledger.manual.json");
export const DOC_PATH = join(ROOT, "docs/porting/mp-sync-ledger.md");
export const DEFAULT_MP_REPO = "/opt/moviepilot-plus/upstream/MoviePilot";
/** 需要监视"新增文件"的上游目录(MP 开源站点框架) */
export const WATCH_DIRS = ["app/modules/indexer/spider", "app/modules/indexer/parser"];
/** 扫描 @mp-source 标签的本项目目录 */
export const SCAN_DIRS = ["packages/adapters/src", "packages/testkit/src"];

export function parseArgs(argv) {
  const out = { _: [] };
  for (let i = 0; i < argv.length; i++) {
    const a = argv[i];
    if (a.startsWith("--")) {
      const k = a.slice(2);
      const v = argv[i + 1] && !argv[i + 1].startsWith("--") ? argv[++i] : true;
      out[k] = v;
    } else out._.push(a);
  }
  return out;
}

export function git(repo, ...args) {
  return execFileSync("git", ["-C", repo, ...args], {
    encoding: "buffer",
    maxBuffer: 256 * 1024 * 1024,
    stdio: ["ignore", "pipe", "ignore"],
  });
}

export function tryGit(repo, ...args) {
  try {
    return git(repo, ...args);
  } catch {
    return null;
  }
}

export function sha256(buf) {
  return createHash("sha256").update(buf).digest("hex");
}

export function resolveCommit(repo, ref) {
  const out = tryGit(repo, "rev-parse", "--verify", `${ref}^{commit}`);
  if (!out) throw new Error(`上游仓库 ${repo} 中找不到提交 ${ref}(浅克隆需先 git fetch --depth=1 origin <commit>)`);
  return out.toString().trim();
}

/** 上游文件在某提交的内容 sha256;不存在返回 null */
export function upstreamHash(repo, commit, path) {
  const buf = tryGit(repo, "show", `${commit}:${path}`);
  return buf ? sha256(buf) : null;
}

export function listUpstreamDir(repo, commit, dir) {
  const out = tryGit(repo, "ls-tree", "--name-only", `${commit}:${dir}`);
  if (!out) return [];
  return out
    .toString()
    .split("\n")
    .filter((f) => f.endsWith(".py"))
    .map((f) => `${dir}/${f}`);
}

function walk(dir, acc) {
  for (const name of readdirSync(dir)) {
    if (name === "node_modules") continue;
    const p = join(dir, name);
    if (statSync(p).isDirectory()) walk(p, acc);
    else if (/\.(ts|mjs)$/.test(name)) acc.push(p);
  }
  return acc;
}

/** 扫描源码文件头 `@mp-source <path> @ <commit>` 标签 */
export function scanTags() {
  const tags = [];
  for (const d of SCAN_DIRS) {
    for (const file of walk(join(ROOT, d), [])) {
      const text = readFileSync(file, "utf8");
      for (const m of text.matchAll(/@mp-source\s+(\S+)\s+@\s+([0-9a-f]{7,40})/g)) {
        tags.push({ upstream: m[1], commit: m[2], ours: relative(ROOT, file) });
      }
    }
  }
  return tags;
}

/** 用仓库 biome 格式化(与 lint 一致,生成物重跑幂等);不可用时原样返回 */
export function biomeFormat(text, fakePath) {
  const bin = join(ROOT, "node_modules/.bin/biome");
  if (!existsSync(bin)) return text;
  try {
    return execFileSync(bin, ["format", `--stdin-file-path=${fakePath}`], { input: text, encoding: "utf8", cwd: ROOT });
  } catch {
    return text;
  }
}