#!/usr/bin/env node
/**
 * Phase C：将 legacy 提醒/待办/自动化任务回填到 h5_tasks
 *
 * 用法:
 *   node scripts/migrate-legacy-tasks-to-h5-tasks.mjs --dry-run
 *   node scripts/migrate-legacy-tasks-to-h5-tasks.mjs --user-id=<uuid> --dry-run
 *   node scripts/migrate-legacy-tasks-to-h5-tasks.mjs --apply
 */
import fs from 'node:fs';
import mysql from 'mysql2/promise';
import { initSchema } from '../db.mjs';
import { createTaskUnifiedService } from '../task-unified-service.mjs';

function parseArgs(argv = process.argv.slice(2)) {
  return {
    dryRun: !argv.includes('--apply'),
    userId: argv.find((arg) => arg.startsWith('--user-id='))?.split('=')[1] ?? null,
  };
}

function loadDatabaseUrl() {
  if (process.env.DATABASE_URL) return process.env.DATABASE_URL;
  const envPath = new URL('../.env', import.meta.url);
  if (!fs.existsSync(envPath)) return null;
  const envText = fs.readFileSync(envPath, 'utf8');
  return envText.match(/^DATABASE_URL=(.+)$/m)?.[1]?.trim().replace(/^["']|["']$/g, '') ?? null;
}

async function main() {
  const options = parseArgs();
  const databaseUrl = loadDatabaseUrl();
  if (!databaseUrl) {
    console.error('缺少 DATABASE_URL');
    process.exit(1);
  }

  const pool = mysql.createPool(databaseUrl);
  await initSchema(pool);
  const service = createTaskUnifiedService(pool);

  console.log(`=== migrate legacy tasks → h5_tasks (${options.dryRun ? 'dry-run' : 'apply'}) ===`);
  if (options.userId) console.log(`user-id: ${options.userId}`);

  const result = await service.migrateLegacyTasks({
    userId: options.userId,
    dryRun: options.dryRun,
  });

  console.log(JSON.stringify(result, null, 2));
  await pool.end();
  process.exit(result.errors > 0 ? 1 : 0);
}

main().catch((err) => {
  console.error(err instanceof Error ? err.stack ?? err.message : err);
  process.exit(1);
});