/**
 * 축제 & 펜션 데이터 동기화 스크립트
 *
 * 사용법:
 *   node server/scripts/syncData.js              # 전체 동기화
 *   node server/scripts/syncData.js festivals    # 축제만
 *   node server/scripts/syncData.js pensions     # 펜션만
 *   node server/scripts/syncData.js --area=32    # 특정 지역만 (32=강원)
 *   node server/scripts/syncData.js festivals --startDate=20251201 --endDate=20261231
 *                                               # 특정 날짜 범위 축제 동기화
 */

const path = require('path');
require('dotenv').config({ path: path.join(__dirname, '../../.env') });
const axios = require('axios');
const db = require('../db');

// 설정
const TOURAPI_KEY = process.env.TOURAPI_KEY;
const TOURAPI_ENDPOINT = process.env.TOURAPI_ENDPOINT || 'https://apis.data.go.kr/B551011/KorService2';

// 지역코드 매핑
const AREA_NAMES = {
  '1': '서울', '2': '인천', '3': '대전', '4': '대구', '5': '광주',
  '6': '부산', '7': '울산', '8': '세종', '31': '경기', '32': '강원',
  '33': '충북', '34': '충남', '35': '경북', '36': '경남', '37': '전북',
  '38': '전남', '39': '제주',
};

// 유틸리티 함수
function sleep(ms) {
  return new Promise(resolve => setTimeout(resolve, ms));
}

function getTodayString() {
  return new Date().toISOString().slice(0, 10).replace(/-/g, '');
}

function getDateAfterMonths(months) {
  const date = new Date();
  date.setMonth(date.getMonth() + months);
  return date.toISOString().slice(0, 10).replace(/-/g, '');
}

function normalizeText(text) {
  if (!text) return '';
  return text.replace(/\s+/g, '').toLowerCase();
}

// DB 프로미스 래퍼
function dbRun(sql, params = []) {
  return new Promise((resolve, reject) => {
    db.run(sql, params, function(err) {
      if (err) reject(err);
      else resolve({ lastID: this.lastID, changes: this.changes });
    });
  });
}

function dbGet(sql, params = []) {
  return new Promise((resolve, reject) => {
    db.get(sql, params, (err, row) => {
      if (err) reject(err);
      else resolve(row);
    });
  });
}

function dbAll(sql, params = []) {
  return new Promise((resolve, reject) => {
    db.all(sql, params, (err, rows) => {
      if (err) reject(err);
      else resolve(rows);
    });
  });
}

// ============================================
// TourAPI 호출
// ============================================

async function callTourApi(operation, params = {}) {
  try {
    const url = `${TOURAPI_ENDPOINT}/${operation}`;
    const response = await axios.get(url, {
      params: {
        serviceKey: TOURAPI_KEY,
        MobileOS: 'ETC',
        MobileApp: 'CastAD',
        _type: 'json',
        ...params,
      },
      timeout: 30000,
    });

    const data = response.data;
    if (data.response?.header?.resultCode !== '0000') {
      throw new Error(data.response?.header?.resultMsg || 'API Error');
    }

    const body = data.response?.body;
    let items = body?.items?.item || [];

    // 단일 아이템일 경우 배열로 변환
    if (items && !Array.isArray(items)) {
      items = [items];
    }

    return {
      items,
      totalCount: body?.totalCount || 0,
      pageNo: body?.pageNo || 1,
      numOfRows: body?.numOfRows || 10,
    };
  } catch (error) {
    if (error.response?.status === 401) {
      throw new Error('TourAPI 인증 실패');
    }
    throw error;
  }
}

// ============================================
// 축제 동기화
// ============================================

async function syncFestivals(areaCode = null, customStartDate = null, customEndDate = null) {
  console.log('\n========================================');
  console.log('🎪 축제 데이터 동기화 시작');
  console.log('========================================');

  // 날짜 설정: 커스텀 날짜가 있으면 사용, 없으면 기본값 (오늘~1년 후)
  const startDate = customStartDate || getTodayString();
  const endDate = customEndDate || getDateAfterMonths(12);

  console.log(`   기간: ${startDate} ~ ${endDate}`);

  let totalSynced = 0;
  let pageNo = 1;
  const errors = [];

  while (true) {
    try {
      const params = {
        numOfRows: 100,
        pageNo,
        eventStartDate: startDate,
        eventEndDate: endDate,
        arrange: 'A',
      };

      if (areaCode) {
        params.areaCode = areaCode;
      }

      console.log(`\n📄 페이지 ${pageNo} 조회 중...`);
      const result = await callTourApi('searchFestival2', params);

      if (!result.items || result.items.length === 0) {
        console.log('  → 더 이상 데이터 없음');
        break;
      }

      console.log(`  → ${result.items.length}건 발견 (전체 ${result.totalCount}건)`);

      for (const item of result.items) {
        try {
          await upsertFestival(item);
          totalSynced++;
        } catch (err) {
          errors.push({ contentId: item.contentid, error: err.message });
        }
      }

      if (result.items.length < 100) break;
      pageNo++;

      // API 호출 제한 대응
      await sleep(200);
    } catch (error) {
      console.error(`  ❌ 페이지 ${pageNo} 에러:`, error.message);
      break;
    }
  }

  console.log('\n========================================');
  console.log(`✅ 축제 동기화 완료: ${totalSynced}건`);
  if (errors.length > 0) {
    console.log(`⚠️  에러: ${errors.length}건`);
  }
  console.log('========================================\n');

  return { synced: totalSynced, errors };
}

async function upsertFestival(item) {
  const exists = await dbGet('SELECT id FROM festivals WHERE content_id = ?', [item.contentid]);

  const sido = AREA_NAMES[item.areacode] || null;

  if (exists) {
    await dbRun(`
      UPDATE festivals SET
        title = ?, addr1 = ?, addr2 = ?, area_code = ?, sigungu_code = ?, sido = ?,
        mapx = ?, mapy = ?, event_start_date = ?, event_end_date = ?,
        first_image = ?, first_image2 = ?, tel = ?, zipcode = ?,
        last_synced_at = ?, updated_at = CURRENT_TIMESTAMP
      WHERE content_id = ?
    `, [
      item.title, item.addr1, item.addr2, item.areacode, item.sigungucode, sido,
      item.mapx ? parseFloat(item.mapx) : null,
      item.mapy ? parseFloat(item.mapy) : null,
      item.eventstartdate, item.eventenddate,
      item.firstimage, item.firstimage2, item.tel, item.zipcode,
      new Date().toISOString(),
      item.contentid
    ]);
  } else {
    await dbRun(`
      INSERT INTO festivals (
        content_id, content_type_id, title, addr1, addr2, area_code, sigungu_code, sido,
        mapx, mapy, event_start_date, event_end_date, first_image, first_image2,
        tel, zipcode, last_synced_at
      ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
    `, [
      item.contentid, item.contenttypeid || '15', item.title, item.addr1, item.addr2,
      item.areacode, item.sigungucode, sido,
      item.mapx ? parseFloat(item.mapx) : null,
      item.mapy ? parseFloat(item.mapy) : null,
      item.eventstartdate, item.eventenddate, item.firstimage, item.firstimage2,
      item.tel, item.zipcode, new Date().toISOString()
    ]);
  }
}

// ============================================
// 펜션 동기화
// ============================================

async function syncPensions(areaCode = null) {
  console.log('\n========================================');
  console.log('🏡 펜션 데이터 동기화 시작');
  console.log('========================================');

  let totalSynced = 0;
  const errors = [];

  // 지역별로 순회 (전체 또는 특정 지역)
  const areaCodes = areaCode ? [areaCode] : Object.keys(AREA_NAMES);

  for (const area of areaCodes) {
    console.log(`\n📍 ${AREA_NAMES[area]} (코드: ${area}) 조회 중...`);

    let pageNo = 1;
    let areaTotal = 0;

    while (true) {
      try {
        const params = {
          numOfRows: 100,
          pageNo,
          areaCode: area,
          arrange: 'A',
        };

        const result = await callTourApi('searchStay2', params);

        if (!result.items || result.items.length === 0) break;

        // 펜션만 필터링 (이름에 '펜션' 포함 또는 cat3 코드)
        const pensions = result.items.filter(item =>
          item.title?.includes('펜션') ||
          item.cat3 === 'B02010700' ||
          item.title?.toLowerCase().includes('pension')
        );

        for (const item of pensions) {
          try {
            await upsertPension(item);
            totalSynced++;
            areaTotal++;
          } catch (err) {
            errors.push({ contentId: item.contentid, error: err.message });
          }
        }

        if (result.items.length < 100) break;
        pageNo++;

        await sleep(200);
      } catch (error) {
        console.error(`  ❌ ${AREA_NAMES[area]} 에러:`, error.message);
        break;
      }
    }

    console.log(`  → ${AREA_NAMES[area]}: ${areaTotal}건`);
  }

  console.log('\n========================================');
  console.log(`✅ 펜션 동기화 완료: ${totalSynced}건`);
  if (errors.length > 0) {
    console.log(`⚠️  에러: ${errors.length}건`);
  }
  console.log('========================================\n');

  return { synced: totalSynced, errors };
}

async function upsertPension(item) {
  const exists = await dbGet(
    'SELECT id FROM public_pensions WHERE source = ? AND content_id = ?',
    ['TOURAPI', item.contentid]
  );

  const sido = AREA_NAMES[item.areacode] || null;
  const nameNormalized = normalizeText(item.title);

  if (exists) {
    await dbRun(`
      UPDATE public_pensions SET
        name = ?, name_normalized = ?, address = ?, area_code = ?, sigungu_code = ?, sido = ?,
        mapx = ?, mapy = ?, tel = ?, thumbnail = ?, zipcode = ?,
        last_synced_at = ?, updated_at = CURRENT_TIMESTAMP
      WHERE source = 'TOURAPI' AND content_id = ?
    `, [
      item.title, nameNormalized, item.addr1, item.areacode, item.sigungucode, sido,
      item.mapx ? parseFloat(item.mapx) : null,
      item.mapy ? parseFloat(item.mapy) : null,
      item.tel, item.firstimage, item.zipcode,
      new Date().toISOString(),
      item.contentid
    ]);
  } else {
    await dbRun(`
      INSERT INTO public_pensions (
        source, source_id, content_id, name, name_normalized, address,
        area_code, sigungu_code, sido, mapx, mapy, tel, thumbnail, zipcode, last_synced_at
      ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
    `, [
      'TOURAPI', item.contentid, item.contentid, item.title, nameNormalized, item.addr1,
      item.areacode, item.sigungucode, sido,
      item.mapx ? parseFloat(item.mapx) : null,
      item.mapy ? parseFloat(item.mapy) : null,
      item.tel, item.firstimage, item.zipcode, new Date().toISOString()
    ]);
  }
}

// ============================================
// 통계 출력
// ============================================

async function printStats() {
  console.log('\n========================================');
  console.log('📊 현재 데이터 현황');
  console.log('========================================');

  // 축제 통계
  const festivalCount = await dbGet('SELECT COUNT(*) as count FROM festivals');
  const festivalByArea = await dbAll(`
    SELECT sido, COUNT(*) as count
    FROM festivals
    WHERE sido IS NOT NULL
    GROUP BY sido
    ORDER BY count DESC
  `);

  console.log(`\n🎪 축제: 총 ${festivalCount.count}건`);
  festivalByArea.forEach(row => {
    console.log(`   - ${row.sido}: ${row.count}건`);
  });

  // 펜션 통계
  const pensionCount = await dbGet('SELECT COUNT(*) as count FROM public_pensions');
  const pensionByArea = await dbAll(`
    SELECT sido, COUNT(*) as count
    FROM public_pensions
    WHERE sido IS NOT NULL
    GROUP BY sido
    ORDER BY count DESC
  `);

  console.log(`\n🏡 펜션: 총 ${pensionCount.count}건`);
  pensionByArea.forEach(row => {
    console.log(`   - ${row.sido}: ${row.count}건`);
  });

  console.log('\n========================================\n');
}

// ============================================
// 메인 실행
// ============================================

async function main() {
  const args = process.argv.slice(2);

  // 옵션 파싱
  let syncType = 'all'; // festivals, pensions, all
  let areaCode = null;
  let startDate = null;
  let endDate = null;

  args.forEach(arg => {
    if (arg === 'festivals') syncType = 'festivals';
    else if (arg === 'pensions') syncType = 'pensions';
    else if (arg.startsWith('--area=')) areaCode = arg.split('=')[1];
    else if (arg.startsWith('--startDate=')) startDate = arg.split('=')[1];
    else if (arg.startsWith('--endDate=')) endDate = arg.split('=')[1];
  });

  console.log('\n🚀 TourAPI 데이터 동기화');
  console.log(`   - 유형: ${syncType}`);
  console.log(`   - 지역: ${areaCode ? AREA_NAMES[areaCode] : '전체'}`);
  if (startDate || endDate) {
    console.log(`   - 날짜 범위: ${startDate || '오늘'} ~ ${endDate || '1년 후'}`);
  }

  try {
    if (syncType === 'all' || syncType === 'festivals') {
      await syncFestivals(areaCode, startDate, endDate);
    }

    if (syncType === 'all' || syncType === 'pensions') {
      await syncPensions(areaCode);
    }

    await printStats();

    console.log('✅ 동기화 완료!\n');
    process.exit(0);
  } catch (error) {
    console.error('\n❌ 동기화 실패:', error.message);
    process.exit(1);
  }
}

// 실행
main();