/**
 * LibraryManager — fetch, state, handlers.
 */
import { useState, useEffect, useCallback } from 'react';
import { apiClient } from '@/services/api/client';
import type { Track as ApiTrack } from '@/features/tracks/types/track';
import type { Track as PlayerTrack } from '@/features/player/types';
import { useToast } from '@/hooks/useToast';
import { logger } from '@/utils/logger';
import { parseApiError } from '@/utils/apiErrorHandler';

export interface UseLibraryManagerOverrides {
  tracksOverride?: ApiTrack[] | null;
  isLoadingOverride?: boolean;
  errorOverride?: string | null;
}

export function useLibraryManager(
  onTrackSelect?: (track: ApiTrack) => void,
  overrides?: UseLibraryManagerOverrides,
) {
  const [tracks, setTracks] = useState<ApiTrack[]>([]);
  const [isLoading, setIsLoading] = useState(true);
  const [error, setError] = useState<string | null>(null);
  const [searchQuery, setSearchQuery] = useState('');
  const [viewMode, setViewMode] = useState<'grid' | 'list'>('grid');
  const [filterType, setFilterType] = useState<string>('all');
  const [pagination, setPagination] = useState({
    page: 1,
    limit: 20,
    total: 0,
  });
  const [isUploadModalOpen, setIsUploadModalOpen] = useState(false);
  const [playingTrackId, setPlayingTrackId] = useState<string | null>(null);
  const { info: showInfo } = useToast();

  const fetchTracks = useCallback(async () => {
    try {
      setIsLoading(true);
      setError(null);
      const response = await apiClient.get<{
        data: ApiTrack[];
        total: number;
        page: number;
        limit: number;
      }>('/tracks', {
        params: {
          page: pagination.page,
          limit: pagination.limit,
          search: searchQuery || undefined,
          artist: filterType !== 'all' ? filterType : undefined,
        },
      });
      const data = response.data;
      setTracks(data.data ?? []);
      setPagination((prev) => ({
        ...prev,
        total: data.total ?? 0,
      }));
    } catch (err: unknown) {
      const apiError = parseApiError(err);
      setError(apiError.message);
      logger.error('Error fetching tracks:', { message: apiError.message });
    } finally {
      setIsLoading(false);
    }
  }, [pagination.page, pagination.limit, searchQuery, filterType]);

  useEffect(() => {
    if (overrides?.tracksOverride !== undefined) {
      setTracks(overrides.tracksOverride ?? []);
      setPagination((p) => ({ ...p, total: (overrides.tracksOverride ?? []).length }));
      setIsLoading(false);
      setError(overrides.errorOverride ?? null);
      return;
    }
    if (overrides?.errorOverride != null) {
      setError(overrides.errorOverride);
      setTracks([]);
      setIsLoading(false);
      return;
    }
    fetchTracks();
  }, [fetchTracks, overrides?.tracksOverride, overrides?.errorOverride]);

  const handleUploadComplete = useCallback(() => {
    fetchTracks();
  }, [fetchTracks]);

  const handleEditTrack = useCallback(
    (_track: PlayerTrack) => {
      showInfo('Edit functionality coming soon — available in the next release');
    },
    [showInfo],
  );

  const handlePlayTrack = useCallback(
    (track: PlayerTrack) => {
      setPlayingTrackId(track.id);
      const originalTrack = tracks.find((t) => t.id === track.id);
      if (originalTrack) {
        onTrackSelect?.(originalTrack);
        showInfo(`Now playing: ${track.title} by ${track.artist}`);
      }
    },
    [tracks, onTrackSelect, showInfo],
  );

  const mapToPlayerTrack = useCallback((track: ApiTrack): PlayerTrack => {
    const t = track as ApiTrack & {
      album?: string;
      cover_art_path?: string;
      stream_manifest_url?: string;
      genre?: string;
    };
    return {
      id: track.id,
      title: track.title,
      artist: track.artist,
      album: t.album,
      duration: track.duration,
      url: t.stream_manifest_url ?? track.file_path,
      cover: t.cover_art_path,
      genre: t.genre,
    };
  }, []);

  const playerTracks = tracks.map(mapToPlayerTrack);

  return {
    tracks,
    isLoading,
    error,
    searchQuery,
    setSearchQuery,
    viewMode,
    setViewMode,
    filterType,
    setFilterType,
    pagination,
    isUploadModalOpen,
    setIsUploadModalOpen,
    playingTrackId,
    playerTracks,
    handleUploadComplete,
    handleEditTrack,
    handlePlayTrack,
  };
}