/**
 * 리플레이 데이터 저장소
 * 참조: src/tracking/stores/mergedTrackStore.ts
 *
 * 청크 기반 선박 항적 데이터 저장 및 관리
 */
import { create } from 'zustand';
import { parseTimestamp } from '../types/replay.types';

/**
 * 청크 기반 선박 데이터 병합
 */
function mergeVesselChunks(existingChunks, newChunk) {
  if (!existingChunks) {
    return {
      vesselId: newChunk.vesselId,
      sigSrcCd: newChunk.sigSrcCd,
      targetId: newChunk.targetId,
      shipName: newChunk.shipName,
      shipKindCode: newChunk.shipKindCode,
      chunks: [newChunk],
      cachedPath: null,
      totalDistance: newChunk.totalDistance || 0,
      maxSpeed: newChunk.maxSpeed || 0,
      avgSpeed: newChunk.avgSpeed || 0,
    };
  }

  // 기존 청크에 새 청크 추가 (시간순 정렬)
  const chunks = [...existingChunks.chunks, newChunk].sort((a, b) => {
    const timeA = parseTimestamp(a.timestamps[0]);
    const timeB = parseTimestamp(b.timestamps[0]);
    return timeA - timeB;
  });

  return {
    ...existingChunks,
    chunks,
    cachedPath: null, // 캐시 무효화
    totalDistance: Math.max(existingChunks.totalDistance, newChunk.totalDistance || 0),
    maxSpeed: Math.max(existingChunks.maxSpeed, newChunk.maxSpeed || 0),
  };
}

/**
 * 병합된 경로 생성 (캐싱)
 */
function buildCachedPath(chunks) {
  const geometry = [];
  const timestamps = [];
  const timestampsMs = [];
  const speeds = [];

  chunks.forEach((chunk) => {
    if (chunk.geometry) {
      geometry.push(...chunk.geometry);
    }
    if (chunk.timestamps) {
      timestamps.push(...chunk.timestamps);
      chunk.timestamps.forEach((ts) => {
        timestampsMs.push(parseTimestamp(ts));
      });
    }
    if (chunk.speeds) {
      speeds.push(...chunk.speeds);
    }
  });

  return {
    geometry,
    timestamps,
    timestampsMs,
    speeds,
    lastUpdated: Date.now(),
  };
}

/**
 * MergedTrackStore
 */
const useMergedTrackStore = create((set, get) => ({
  // ===== 상태 =====

  // 청크 기반 저장소 (메인)
  vesselChunks: new Map(), // Map<vesselId, VesselChunks>

  // 원본 청크 (리플레이용)
  rawChunks: [],

  // 메타데이터
  timeRange: null, // { start: number, end: number }
  spatialBounds: null, // { minLon, maxLon, minLat, maxLat }

  // ===== 액션 =====

  /**
   * 청크 추가 (최적화)
   */
  addChunkOptimized: (chunkResponse) => {
    const tracks = chunkResponse.tracks || [];

    set((state) => {
      const newVesselChunks = new Map(state.vesselChunks);
      let timeRange = state.timeRange;

      tracks.forEach((track) => {
        const vesselId = track.vesselId;
        const existingChunks = newVesselChunks.get(vesselId);
        const mergedChunks = mergeVesselChunks(existingChunks, track);

        newVesselChunks.set(vesselId, mergedChunks);

        // 시간 범위 업데이트
        if (track.timestamps && track.timestamps.length > 0) {
          const firstTime = parseTimestamp(track.timestamps[0]);
          const lastTime = parseTimestamp(track.timestamps[track.timestamps.length - 1]);

          if (!timeRange) {
            timeRange = { start: firstTime, end: lastTime };
          } else {
            timeRange = {
              start: Math.min(timeRange.start, firstTime),
              end: Math.max(timeRange.end, lastTime),
            };
          }
        }
      });

      return {
        vesselChunks: newVesselChunks,
        timeRange,
      };
    });
  },

  /**
   * 병합된 경로 반환 (캐시 사용)
   */
  getMergedPath: (vesselId) => {
    const vesselChunks = get().vesselChunks.get(vesselId);
    if (!vesselChunks) return null;

    // 캐시 확인
    if (vesselChunks.cachedPath) {
      return vesselChunks.cachedPath;
    }

    // 새로 생성
    const cachedPath = buildCachedPath(vesselChunks.chunks);

    // 캐시 저장
    set((state) => {
      const newVesselChunks = new Map(state.vesselChunks);
      newVesselChunks.set(vesselId, {
        ...vesselChunks,
        cachedPath,
      });
      return { vesselChunks: newVesselChunks };
    });

    return cachedPath;
  },

  /**
   * 원본 청크 추가
   */
  addRawChunk: (chunkResponse) => {
    set((state) => ({
      rawChunks: [...state.rawChunks, chunkResponse],
    }));
  },

  /**
   * 전체 초기화
   */
  clear: () => {
    set({
      vesselChunks: new Map(),
      rawChunks: [],
      timeRange: null,
      spatialBounds: null,
    });
  },

  /**
   * 모든 선박 ID 반환
   */
  getAllVesselIds: () => {
    return Array.from(get().vesselChunks.keys());
  },

  /**
   * 선박 데이터 반환
   */
  getVesselChunks: (vesselId) => {
    return get().vesselChunks.get(vesselId) || null;
  },
}));

export default useMergedTrackStore;