const path = require("node:path");
const fs = require("node:fs");
const { createApp } = require("./app");
const { JsonStore } = require("./store");
const { PostgresStore } = require("./postgres-store");

const host = process.env.HOST || "127.0.0.1";
const port = Number(process.env.PORT || 3000);
const identificationPurgeIntervalMs = Number(process.env.IDENTIFICATION_PURGE_INTERVAL_MS || 60 * 60 * 1000);
const dataDirectory = path.resolve(process.env.DATA_DIR || path.join(__dirname, "..", "data"));

async function main() {
  if (!Number.isInteger(port) || port < 1 || port > 65535) throw new Error("PORT 必须是有效端口号");
  const jsonDatabasePath = path.join(dataDirectory, "database.json");
  const hasExistingJsonStore = await fs.promises.access(jsonDatabasePath).then(() => true, () => false);
  if (process.env.NODE_ENV === "production" && !process.env.DATABASE_URL && !hasExistingJsonStore) {
    throw new Error("生产环境必须配置 DATABASE_URL");
  }
  if (process.env.NODE_ENV === "production" && !process.env.DATABASE_URL) {
    console.warn("警告: 正在使用既有 JSON 数据库；请尽快迁移到 PostgreSQL");
  }
  const filesDirectory = path.join(dataDirectory, "files");
  await fs.promises.mkdir(filesDirectory, { recursive: true });
  const store = process.env.DATABASE_URL
    ? new PostgresStore(process.env.DATABASE_URL, filesDirectory)
    : new JsonStore(dataDirectory);
  await store.initialize();
  const app = createApp({ store });
  const purgeIdentificationFiles = async () => {
    try {
      const purged = await app.locals.purgeExpiredIdentificationFiles();
      if (purged) console.info(`[retention] purged ${purged} expired identification file(s)`);
    } catch (error) {
      console.error("[retention] identification file purge failed", error);
    }
  };
  await purgeIdentificationFiles();
  const purgeTimer = setInterval(purgeIdentificationFiles, identificationPurgeIntervalMs);
  purgeTimer.unref();
  app.listen(port, host, () => {
    console.log(`ReinLoop server listening on http://${host}:${port}`);
    console.log(`API endpoint: http://${host}:${port}`);
    console.log(`Data directory: ${dataDirectory}`);
    console.log(`Metadata store: ${process.env.DATABASE_URL ? "PostgreSQL" : "local JSON"}`);
  });
}

main().catch((error) => {
  console.error(error.message);
  process.exitCode = 1;
});