import fp from 'fastify-plugin';

const TRACKER_URL = process.env.TRACKER_URL || 'http://delivery-tracker:4000/';

// delivery-tracker의 carrier ID는 kr. 접두사 필요
const CARRIER_ID_MAP = {
  cjlogistics: 'kr.cjlogistics',
  hanjin: 'kr.hanjin',
  lotte: 'kr.lotte',
  epost: 'kr.epost',
  logen: 'kr.logen',
};

const TRACK_QUERY = `
  query Track($carrierId: ID!, $trackingNumber: String!) {
    track(carrierId: $carrierId, trackingNumber: $trackingNumber) {
      trackingNumber
      lastEvent {
        status { code name }
        time
        location { name }
        description
      }
      events(last: 100) {
        edges {
          node {
            status { code name }
            time
            location { name }
            description
          }
        }
      }
    }
  }
`;

async function trackerPlugin(fastify) {
  const tracker = {
    async track(carrierId, trackingNumber) {
      const graphqlCarrierId = CARRIER_ID_MAP[carrierId] || `kr.${carrierId}`;

      const res = await fetch(TRACKER_URL, {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({
          query: TRACK_QUERY,
          variables: {
            carrierId: graphqlCarrierId,
            trackingNumber,
          },
        }),
      });

      const json = await res.json();

      if (json.errors) {
        const msg = json.errors[0]?.message || 'tracking failed';
        throw new Error(msg);
      }

      const trackInfo = json.data?.track;
      if (!trackInfo) {
        return null;
      }

      // 이벤트 정리
      const events = (trackInfo.events?.edges || []).map((edge) => {
        const node = edge.node;
        return {
          status: node.status?.code || 'UNKNOWN',
          statusName: node.status?.name || '',
          description: node.description || '',
          location: node.location?.name || '',
          time: node.time || null,
        };
      });

      // 마지막 이벤트
      const lastEvent = trackInfo.lastEvent
        ? {
            status: trackInfo.lastEvent.status?.code || 'UNKNOWN',
            statusName: trackInfo.lastEvent.status?.name || '',
            description: trackInfo.lastEvent.description || '',
            location: trackInfo.lastEvent.location?.name || '',
            time: trackInfo.lastEvent.time || null,
          }
        : null;

      return {
        trackingNumber: trackInfo.trackingNumber,
        lastEvent,
        events,
      };
    },
  };

  fastify.decorate('tracker', tracker);
}

export default fp(trackerPlugin, { name: 'tracker' });