#!/usr/bin/env node
/**
 * replace-team-qrcode-url
 *
 * 目的：
 * - 扫描 corp.team collection
 * - 将 team.qrcodes[].qrcode 中旧前缀替换为新前缀
 * - 扫描 corp.staff-qrcode collection
 * - 将 staff-qrcode.archiveLink.url 中旧前缀替换为新前缀
 *
 * 安全：
 * - 默认 dry-run（不落库）
 * - `--apply --yes` 才会写入
 */

const { MongoClient } = require("mongodb");
const dotenv = require("dotenv");
const fs = require("fs");
const path = require("path");

function isNonEmptyString(v) {
  return typeof v === "string" && v.trim().length > 0;
}

function safeNumber(n, fallback) {
  if (!Number.isFinite(n) || n <= 0) return fallback;
  return n;
}

function loadDotEnv() {
  const nodeEnv = process.env.NODE_ENV || "development";
  const envFileName = `.env.${nodeEnv}`;
  const plainEnvFileName = `env.${nodeEnv}`;
  const explicitEnvFile = process.env.ENV_FILE || process.env.DOTENV_CONFIG_PATH || "";
  const candidates = [];

  if (isNonEmptyString(explicitEnvFile)) {
    candidates.push(
      path.isAbsolute(explicitEnvFile) ? explicitEnvFile : path.resolve(process.cwd(), explicitEnvFile),
      path.isAbsolute(explicitEnvFile) ? explicitEnvFile : path.resolve(__dirname, explicitEnvFile)
    );
  }

  candidates.push(
    path.resolve(process.cwd(), envFileName),
    path.resolve(__dirname, envFileName),
    path.resolve(process.cwd(), plainEnvFileName),
    path.resolve(__dirname, plainEnvFileName),
    path.resolve(process.cwd(), ".env"),
    path.resolve(__dirname, ".env")
  );

  const picked = candidates.find((p) => {
    try {
      return fs.existsSync(p);
    } catch {
      return false;
    }
  });

  if (picked) {
    dotenv.config({ path: picked });
    console.log(`[env] loaded: ${picked}`);
    return;
  }
  dotenv.config();
}

loadDotEnv();

function createDefaultOptions() {
  return {
    dbName: "corp",
    collection: "team",
    staffCollection: "staff-qrcode",
    batchDocs: 200,
    skipDocs: 0,
    limitDocs: 0,
    sortById: true,
    dryRun: true,
    yes: false,
    help: false,
    reportZh: false,
    logFile: "",
    mongoUri: "",
    mongoUriEnv: "",
    mongoHost: "",
    mongoPort: "",
    mongoUser: "",
    mongoPass: "",
    mongoAuthDb: "",
    corpId: "",
    oldPrefix: "https://www.youcan365.com/h5/#/",
    newPrefix: "https://crm.gykqyy.com/gkPatientWeChat/#/",
  };
}

function parseArgs(argv) {
  const args = argv.slice(2);
  const opts = createDefaultOptions();

  function takeValue(i) {
    if (i + 1 >= args.length) return "";
    return args[i + 1];
  }

  function setKeyValue(keyRaw, valueRaw) {
    const key = String(keyRaw || "").replace(/^--/, "").trim().toLowerCase();
    const value = valueRaw;
    if (!key) return;
    if (key === "dbname" || key === "db") opts.dbName = value;
    else if (key === "collection") opts.collection = value;
    else if (key === "staffcollection") opts.staffCollection = value;
    else if (key === "mongouri" || key === "mongourl") opts.mongoUri = value;
    else if (key === "mongourienv") opts.mongoUriEnv = value;
    else if (key === "mongohost") opts.mongoHost = value;
    else if (key === "mongoport") opts.mongoPort = value;
    else if (key === "mongouser") opts.mongoUser = value;
    else if (key === "mongopass") opts.mongoPass = value;
    else if (key === "mongoauthdb") opts.mongoAuthDb = value;
    else if (key === "corpid") opts.corpId = value;
    else if (key === "oldprefix") opts.oldPrefix = value;
    else if (key === "newprefix") opts.newPrefix = value;
    else if (key === "batchdocs") opts.batchDocs = Number(value);
    else if (key === "skipdocs" || key === "skip-docs") opts.skipDocs = Number(value);
    else if (key === "limitdocs" || key === "limit-docs") opts.limitDocs = Number(value);
    else if (key === "logfile" || key === "log_file") opts.logFile = value;
  }

  for (let i = 0; i < args.length; i++) {
    const a = args[i];
    if (!a) continue;
    if (a === "--") continue;

    if (typeof a === "string" && a.includes("=")) {
      const [k, ...rest] = a.split("=");
      setKeyValue(k, rest.join("="));
      continue;
    }

    if (a === "--help" || a === "-h") opts.help = true;
    else if (a === "--apply") opts.dryRun = false;
    else if (a === "--yes") opts.yes = true;
    else if (a === "--reportZh" || a === "--zh") opts.reportZh = true;
    else if (a === "--dbName" || a === "--db") {
      opts.dbName = takeValue(i);
      i++;
    } else if (a === "--collection") {
      opts.collection = takeValue(i);
      i++;
    } else if (a === "--staffCollection") {
      opts.staffCollection = takeValue(i);
      i++;
    } else if (a === "--mongoUri" || a === "--mongoUrl" || a === "--mongoURL") {
      opts.mongoUri = takeValue(i);
      i++;
    } else if (a === "--mongoUriEnv") {
      opts.mongoUriEnv = takeValue(i);
      i++;
    } else if (a === "--mongoHost") {
      opts.mongoHost = takeValue(i);
      i++;
    } else if (a === "--mongoPort") {
      opts.mongoPort = takeValue(i);
      i++;
    } else if (a === "--mongoUser") {
      opts.mongoUser = takeValue(i);
      i++;
    } else if (a === "--mongoPass") {
      opts.mongoPass = takeValue(i);
      i++;
    } else if (a === "--mongoAuthDb") {
      opts.mongoAuthDb = takeValue(i);
      i++;
    } else if (a === "--corpId") {
      opts.corpId = takeValue(i);
      i++;
    } else if (a === "--oldPrefix") {
      opts.oldPrefix = takeValue(i);
      i++;
    } else if (a === "--newPrefix") {
      opts.newPrefix = takeValue(i);
      i++;
    } else if (a === "--batchDocs") {
      opts.batchDocs = Number(takeValue(i));
      i++;
    } else if (a === "--skipDocs" || a === "--skip-docs") {
      opts.skipDocs = Number(takeValue(i));
      i++;
    } else if (a === "--limitDocs" || a === "--limit-docs") {
      opts.limitDocs = Number(takeValue(i));
      i++;
    } else if (a === "--logFile" || a === "--log-file") {
      opts.logFile = takeValue(i);
      i++;
    }
  }

  return opts;
}

function applyEnvFallbacks(opts) {
  if (!opts.mongoUri) opts.mongoUri = process.env.MONGO_URI || process.env.GK_MONGO_URI || "";
  if (!opts.corpId) {
    opts.corpId = process.env.TARGET_CORP_ID || process.env.TOKEN_CORP_ID || "";
  }
  if (!opts.oldPrefix && process.env.OLD_QRCODE_PREFIX) opts.oldPrefix = process.env.OLD_QRCODE_PREFIX;
  if (!opts.newPrefix && process.env.NEW_QRCODE_PREFIX) opts.newPrefix = process.env.NEW_QRCODE_PREFIX;
}

function die(msg) {
  console.error(msg);
  process.exit(1);
}

function formatTimestampForFile(d = new Date()) {
  const pad = (n) => String(n).padStart(2, "0");
  return [
    d.getFullYear(),
    pad(d.getMonth() + 1),
    pad(d.getDate()),
    "-",
    pad(d.getHours()),
    pad(d.getMinutes()),
    pad(d.getSeconds()),
  ].join("");
}

function initFileLogger(opts) {
  const logsDir = path.resolve(process.cwd(), "logs");
  if (!fs.existsSync(logsDir)) fs.mkdirSync(logsDir, { recursive: true });
  const logFile = opts.logFile || path.join(logsDir, `replace-team-qrcode-url-${formatTimestampForFile()}.log`);
  const stream = fs.createWriteStream(logFile, { flags: "a" });
  const origLog = console.log;
  const origErr = console.error;
  const write = (level, args) => {
    const line = args
      .map((arg) => {
        if (typeof arg === "string") return arg;
        try {
          return JSON.stringify(arg);
        } catch {
          return String(arg);
        }
      })
      .join(" ");
    stream.write(`[${new Date().toISOString()}] [${level}] ${line}\n`);
  };
  console.log = (...args) => {
    write("INFO", args);
    origLog(...args);
  };
  console.error = (...args) => {
    write("ERROR", args);
    origErr(...args);
  };
  console.log(`[log] writing to ${logFile}`);
}

function buildMongoUrl(opts) {
  if (isNonEmptyString(opts.mongoUriEnv) && isNonEmptyString(process.env[opts.mongoUriEnv])) {
    return process.env[opts.mongoUriEnv];
  }
  if (isNonEmptyString(opts.mongoUri)) {
    return opts.mongoUri;
  }
  const host = opts.mongoHost || process.env.MONGO_HOST || process.env.CONFIG_DB_HOST;
  const port = opts.mongoPort || process.env.MONGO_PORT || process.env.CONFIG_DB_PORT || "27017";
  const username = opts.mongoUser || process.env.MONGO_USER || process.env.CONFIG_DB_USERNAME;
  const password = opts.mongoPass || process.env.MONGO_PASS || process.env.CONFIG_DB_PASSWORD;
  const authDb = opts.mongoAuthDb || process.env.MONGO_AUTH_DB || "admin";
  if (!host || !username || !password) {
    return "";
  }
  return `mongodb://${encodeURIComponent(username)}:${encodeURIComponent(password)}@${host}:${port}/${authDb}`;
}

function replacePrefix(value, oldPrefix, newPrefix) {
  if (!isNonEmptyString(value) || !isNonEmptyString(oldPrefix) || !isNonEmptyString(newPrefix)) return value;
  if (!value.startsWith(oldPrefix)) return value;
  return `${newPrefix}${value.slice(oldPrefix.length)}`;
}

function updateTeamDoc(doc, { oldPrefix, newPrefix }) {
  const qrcodes = Array.isArray(doc.qrcodes) ? doc.qrcodes : [];
  let changed = 0;
  const nextQrcodes = qrcodes.map((item) => {
    if (!item || typeof item !== "object") return item;
    const current = item.qrcode;
    const next = replacePrefix(current, oldPrefix, newPrefix);
    if (next !== current) {
      changed++;
      return { ...item, qrcode: next };
    }
    return item;
  });
  return { changed, nextQrcodes };
}

function updateStaffQrcodeDoc(doc, { oldPrefix, newPrefix }) {
  const archiveLink =
    doc && doc.archiveLink && typeof doc.archiveLink === "object"
      ? doc.archiveLink
      : null;
  if (!archiveLink) {
    return { changed: 0, nextArchiveLink: archiveLink };
  }
  const current = archiveLink.url;
  const next = replacePrefix(current, oldPrefix, newPrefix);
  if (next === current) {
    return { changed: 0, nextArchiveLink: archiveLink };
  }
  return {
    changed: 1,
    nextArchiveLink: { ...archiveLink, url: next },
  };
}

async function processCollectionDocs({
  collection,
  filter,
  batchDocs,
  sortById,
  skipDocs,
  limitDocs,
  dryRun,
  updateDoc,
  buildUpdate,
  describeDoc,
}) {
  let cursor = collection.find(filter, { batchSize: batchDocs });
  if (sortById) cursor = cursor.sort({ _id: 1 });
  if (skipDocs) cursor = cursor.skip(skipDocs);
  if (limitDocs) cursor = cursor.limit(limitDocs);

  let scanned = 0;
  let matchedDocs = 0;
  let replacedUrls = 0;
  let batchIndex = 0;

  while (await cursor.hasNext()) {
    const batch = [];
    while (batch.length < batchDocs && (await cursor.hasNext())) {
      batch.push(await cursor.next());
    }
    if (batch.length === 0) break;
    batchIndex++;
    console.log(
      `[step] ${collection.collectionName} batch#${batchIndex} 读取文档 ${batch.length} 条（已扫描 ${scanned} 条）`
    );

    for (const doc of batch) {
      scanned++;
      const { changed, ...payload } = updateDoc(doc);
      if (changed === 0) continue;
      matchedDocs++;
      replacedUrls += changed;
      console.log(`[match] ${collection.collectionName} ${describeDoc(doc)} replaced=${changed}`);

      if (!dryRun) {
        await collection.updateOne({ _id: doc._id }, buildUpdate(payload));
      }
    }
  }

  return { scanned, matchedDocs, replacedUrls };
}

async function main() {
  const opts = parseArgs(process.argv);
  applyEnvFallbacks(opts);
  initFileLogger(opts);

  if (opts.help) {
    console.log(`replace-team-qrcode-url

用法：
  node replace-team-qrcode-url.js --apply --yes

可选参数：
  --dbName <db>         数据库名，默认 corp
  --collection <name>   collection 名，默认 team
  --corpId <corpId>     仅处理指定机构
  --oldPrefix <url>     旧前缀，默认 https://www.youcan365.com/h5/#/
  --newPrefix <url>     新前缀，默认 https://crm.gykqyy.com/gkPatientWeChat/#/
  --apply --yes         真正写库；默认 dry-run
`);
    return;
  }

  opts.batchDocs = safeNumber(opts.batchDocs, 200);
  opts.skipDocs = Number.isFinite(opts.skipDocs) && opts.skipDocs > 0 ? Math.floor(opts.skipDocs) : 0;
  opts.limitDocs = Number.isFinite(opts.limitDocs) && opts.limitDocs > 0 ? Math.floor(opts.limitDocs) : 0;

  if (!opts.dryRun && !opts.yes) {
    die("该脚本会直接回写原 collection。请确认后加上 --yes 再执行。");
  }

  const mongoUrl = buildMongoUrl(opts);
  if (!isNonEmptyString(mongoUrl)) {
    die("缺少 MongoDB 连接信息：请传 --mongoUri，或配置 GK_MONGO_URI / MONGO_URI");
  }

  const client = new MongoClient(mongoUrl, {
    serverSelectionTimeoutMS: 30000,
    connectTimeoutMS: 30000,
  });

  console.log("[step] 正在连接 MongoDB...");
  await client.connect();
  console.log("[step] MongoDB 已连接");

  try {
    const db = client.db(opts.dbName);
    const teamCol = db.collection(opts.collection);
    const staffCol = db.collection(opts.staffCollection);
    const filter = {};
    if (isNonEmptyString(opts.corpId)) filter.corpId = opts.corpId;

    console.log(
      `[step] collection=${opts.dbName}.${opts.collection} corpId=${opts.corpId || "全部"} mode=${opts.dryRun ? "dry-run" : "apply"}`
    );
    const teamStats = await processCollectionDocs({
      collection: teamCol,
      filter,
      batchDocs: opts.batchDocs,
      sortById: opts.sortById,
      skipDocs: opts.skipDocs,
      limitDocs: opts.limitDocs,
      dryRun: opts.dryRun,
      updateDoc: (doc) =>
        updateTeamDoc(doc, {
          oldPrefix: opts.oldPrefix,
          newPrefix: opts.newPrefix,
        }),
      buildUpdate: ({ nextQrcodes }) => ({ $set: { qrcodes: nextQrcodes } }),
      describeDoc: (doc) =>
        `_id=${doc._id} teamId=${doc.teamId || ""} corpId=${doc.corpId || ""}`,
    });

    console.log(
      `[step] collection=${opts.dbName}.${opts.staffCollection} corpId=${opts.corpId || "全部"} mode=${opts.dryRun ? "dry-run" : "apply"}`
    );
    const staffStats = await processCollectionDocs({
      collection: staffCol,
      filter,
      batchDocs: opts.batchDocs,
      sortById: opts.sortById,
      skipDocs: opts.skipDocs,
      limitDocs: opts.limitDocs,
      dryRun: opts.dryRun,
      updateDoc: (doc) =>
        updateStaffQrcodeDoc(doc, {
          oldPrefix: opts.oldPrefix,
          newPrefix: opts.newPrefix,
        }),
      buildUpdate: ({ nextArchiveLink }) => ({
        $set: { archiveLink: nextArchiveLink },
      }),
      describeDoc: (doc) =>
        `_id=${doc._id} qrcodeId=${doc.qrcodeId || ""} corpId=${doc.corpId || ""}`,
    });

    console.log(
      `[summary] team: scanned=${teamStats.scanned} matchedDocs=${teamStats.matchedDocs} replacedUrls=${teamStats.replacedUrls} | staff-qrcode: scanned=${staffStats.scanned} matchedDocs=${staffStats.matchedDocs} replacedUrls=${staffStats.replacedUrls} mode=${opts.dryRun ? "dry-run" : "apply"}`
    );
  } finally {
    await client.close();
  }
}

main().catch((error) => {
  console.error(error && error.stack ? error.stack : error);
  process.exit(1);
});