import { fetchGoodsName } from '../services/goods-name.js';

export default async function parcelRoutes(fastify) {
  // 전체 택배 목록 (페이징)
  fastify.get('/', async (request) => {
    const { status, page = 1, limit = 20 } = request.query;
    const offset = (Math.max(1, Number(page)) - 1) * Number(limit);
    const lim = Math.min(100, Math.max(1, Number(limit)));

    let where = '';
    const params = [];

    if (status === 'active') {
      where = 'WHERE status != ?';
      params.push('DELIVERED');
    } else if (status === 'delivered') {
      where = 'WHERE status = ?';
      params.push('DELIVERED');
    }

    const [[{ total }]] = await fastify.db.execute(
      `SELECT COUNT(*) as total FROM parcels ${where}`,
      params
    );

    const [rows] = await fastify.db.execute(
      `SELECT * FROM parcels ${where} ORDER BY created_at DESC LIMIT ? OFFSET ?`,
      [...params, String(lim), String(offset)]
    );

    return {
      data: rows,
      pagination: {
        page: Number(page),
        limit: lim,
        total,
        totalPages: Math.ceil(total / lim),
      },
    };
  });

  // 운송장 등록
  fastify.post('/', async (request, reply) => {
    const { carrierId, trackingNumber, label } = request.body;

    // 택배사 조회
    const [carriers] = await fastify.db.execute(
      'SELECT id, name FROM carriers WHERE id = ?',
      [carrierId]
    );
    if (carriers.length === 0) {
      return reply.code(400).send({ error: '지원하지 않는 택배사입니다' });
    }

    const carrier = carriers[0];

    // 중복 확인
    const [existing] = await fastify.db.execute(
      'SELECT id FROM parcels WHERE carrier_id = ? AND tracking_number = ?',
      [carrierId, trackingNumber]
    );
    if (existing.length > 0) {
      return reply.code(409).send({ error: '이미 등록된 운송장입니다' });
    }

    // 물품명 자동 조회 (CJ대한통운, 한진택배)
    let goodsName = null;
    try {
      goodsName = await fetchGoodsName(carrierId, trackingNumber);
    } catch (err) {
      fastify.log.warn(`물품명 조회 실패: ${err.message}`);
    }

    // 등록
    const [result] = await fastify.db.execute(
      'INSERT INTO parcels (carrier_id, carrier_name, tracking_number, label, goods_name) VALUES (?, ?, ?, ?, ?)',
      [carrierId, carrier.name, trackingNumber, label || goodsName || null, goodsName]
    );

    const parcelId = result.insertId;

    // 즉시 배송 조회
    try {
      await refreshParcel(fastify, parcelId);
    } catch (err) {
      fastify.log.warn(`등록 후 조회 실패: ${err.message}`);
    }

    const [parcels] = await fastify.db.execute(
      'SELECT * FROM parcels WHERE id = ?',
      [parcelId]
    );

    return reply.code(201).send(parcels[0]);
  });

  // 개별 택배 상세 + 추적 이벤트
  fastify.get('/:id', async (request, reply) => {
    const { id } = request.params;

    const [parcels] = await fastify.db.execute(
      'SELECT * FROM parcels WHERE id = ?',
      [id]
    );
    if (parcels.length === 0) {
      return reply.code(404).send({ error: '택배를 찾을 수 없습니다' });
    }

    const [events] = await fastify.db.execute(
      'SELECT * FROM tracking_events WHERE parcel_id = ? ORDER BY event_time ASC',
      [id]
    );

    return { ...parcels[0], events };
  });

  // 별칭 수정
  fastify.put('/:id', async (request, reply) => {
    const { id } = request.params;
    const { label } = request.body;

    const [result] = await fastify.db.execute(
      'UPDATE parcels SET label = ? WHERE id = ?',
      [label, id]
    );

    if (result.affectedRows === 0) {
      return reply.code(404).send({ error: '택배를 찾을 수 없습니다' });
    }

    const [parcels] = await fastify.db.execute(
      'SELECT * FROM parcels WHERE id = ?',
      [id]
    );
    return parcels[0];
  });

  // 운송장 삭제
  fastify.delete('/:id', async (request, reply) => {
    const { id } = request.params;

    const [result] = await fastify.db.execute(
      'DELETE FROM parcels WHERE id = ?',
      [id]
    );

    if (result.affectedRows === 0) {
      return reply.code(404).send({ error: '택배를 찾을 수 없습니다' });
    }

    return { success: true };
  });

  // 수동 새로고침
  fastify.post('/:id/refresh', async (request, reply) => {
    const { id } = request.params;

    const [parcels] = await fastify.db.execute(
      'SELECT * FROM parcels WHERE id = ?',
      [id]
    );
    if (parcels.length === 0) {
      return reply.code(404).send({ error: '택배를 찾을 수 없습니다' });
    }

    await refreshParcel(fastify, id);

    const [updated] = await fastify.db.execute(
      'SELECT * FROM parcels WHERE id = ?',
      [id]
    );
    const [events] = await fastify.db.execute(
      'SELECT * FROM tracking_events WHERE parcel_id = ? ORDER BY event_time ASC',
      [id]
    );

    return { ...updated[0], events };
  });
}

function toMysqlDatetime(isoString) {
  if (!isoString) return null;
  const d = new Date(isoString);
  if (isNaN(d.getTime())) return null;
  return d.toISOString().slice(0, 19).replace('T', ' ');
}

async function refreshParcel(fastify, parcelId) {
  const [parcels] = await fastify.db.execute(
    'SELECT * FROM parcels WHERE id = ?',
    [parcelId]
  );
  if (parcels.length === 0) return;

  const parcel = parcels[0];
  const result = await fastify.tracker.track(parcel.carrier_id, parcel.tracking_number);

  if (!result) {
    await fastify.db.execute(
      'UPDATE parcels SET last_checked_at = NOW() WHERE id = ?',
      [parcelId]
    );
    return;
  }

  // 상태 업데이트
  const status = result.lastEvent?.status || 'UNKNOWN';
  const lastDetail = result.lastEvent?.description || '';
  const deliveredAt = status === 'DELIVERED' ? toMysqlDatetime(result.lastEvent?.time) : null;

  await fastify.db.execute(
    `UPDATE parcels SET status = ?, last_detail = ?, last_checked_at = NOW(),
     delivered_at = COALESCE(?, delivered_at),
     sender_name = COALESCE(?, sender_name),
     recipient_name = COALESCE(?, recipient_name)
     WHERE id = ?`,
    [status, lastDetail, deliveredAt, result.senderName, result.recipientName, parcelId]
  );

  // 기존 이벤트 삭제 후 새로 삽입
  await fastify.db.execute('DELETE FROM tracking_events WHERE parcel_id = ?', [parcelId]);

  for (const event of result.events) {
    await fastify.db.execute(
      `INSERT INTO tracking_events (parcel_id, status, status_name, description, location, event_time)
       VALUES (?, ?, ?, ?, ?, ?)`,
      [parcelId, event.status, event.statusName, event.description, event.location, toMysqlDatetime(event.time)]
    );
  }
}