#!/usr/bin/env node
/**
 * 比较 ledger.json 与 MoviePilot 目标提交,列出需要跟随移植的上游变化。
 *
 *   node scripts/mp-sync/check.mjs [--mp <MP 仓库路径>] [--to <目标提交,默认 HEAD>] [--json]
 *
 * 输出:已变更 / 已删除 / 未变化 的 ledger 文件,监视目录(spider/、parser/)中 ledger 未收录的新文件,
 * 以及逐文件 `git diff` 命令。存在变化时退出码为 1(可用于 CI 或定时提醒)。
 * 浅克隆需要先取目标提交:git -C <mp> fetch --depth=1 origin <commit>(或 fetch --unshallow)。
 */
import { readFileSync } from "node:fs";
import { DEFAULT_MP_REPO, LEDGER_PATH, listUpstreamDir, parseArgs, resolveCommit, upstreamHash } from "./lib.mjs";

const args = parseArgs(process.argv.slice(2));
const repo = args.mp ?? DEFAULT_MP_REPO;
const target = resolveCommit(repo, args.to ?? "HEAD");
const ledger = JSON.parse(readFileSync(args.ledger ?? LEDGER_PATH, "utf8"));

const changed = [];
const deleted = [];
const unchanged = [];
for (const e of ledger.entries) {
  const h = upstreamHash(repo, target, e.upstream);
  if (h === null) deleted.push(e);
  else if (h !== e.sha256) changed.push({ ...e, newSha256: h });
  else unchanged.push(e);
}
const known = new Set(ledger.entries.map((e) => e.upstream));
const added = [];
for (const dir of ledger.watchDirs ?? []) {
  for (const f of listUpstreamDir(repo, target, dir)) if (!known.has(f)) added.push(f);
}

const short = (c) => c.slice(0, 7);
if (args.json) {
  console.log(JSON.stringify({ target, changed, deleted, added, unchanged: unchanged.length }, null, 2));
} else {
  console.log(`MoviePilot 目标提交 ${short(target)}(ledger ${ledger.entries.length} 个文件)\n`);
  const section = (title, list, fmt) => {
    console.log(`## ${title}(${list.length})`);
    for (const x of list) console.log(fmt(x));
    console.log("");
  };
  section("已变更", changed, (e) =>
    [
      `- ${e.upstream}  (${short(e.commit)} → ${short(target)})`,
      `    本项目:${e.ours.join(", ")}`,
      `    git -C ${repo} diff ${short(e.commit)} ${short(target)} -- ${e.upstream}`,
    ].join("\n"),
  );
  section("已删除 / 改名", deleted, (e) =>
    [
      `- ${e.upstream}(本项目:${e.ours.join(", ")})`,
      `    git -C ${repo} log --oneline --follow ${short(e.commit)}..${short(target)} -- ${e.upstream}`,
      `    git -C ${repo} diff --stat -M ${short(e.commit)} ${short(target)} -- ${e.upstream.replace(/\/[^/]+$/, "/")}`,
    ].join("\n"),
  );
  section("监视目录新增(ledger 未收录)", added, (f) => `- ${f}\n    git -C ${repo} show ${short(target)}:${f}`);
  console.log(`未变化:${unchanged.length}`);
  if (changed.length || deleted.length || added.length) {
    console.log(
      "\n处理流程:按 diff 增量移植 → 把对应源码文件头 `@mp-source ... @ <提交>` 改为新提交(新文件新增标签)→ node scripts/mp-sync/build-ledger.mjs --commit <新提交> → 测试。",
    );
  }
}
process.exit(changed.length || deleted.length || added.length ? 1 : 0);