import { Playlist, ServerType, ApiResponse, PlexServerConnection, PlexConnectionSettings, PlexLibrary, ReplacementRule, PathMappingConfig, PathMappingMode, PathMappingRules, SyncStrategy, ScheduleSettings, BackupSettings } from '../types';

const API_BASE = import.meta.env.VITE_API_BASE_URL || '';

const MODE_TO_STRATEGY: Record<string, SyncStrategy> = {
  local_force: SyncStrategy.LOCAL_OVERWRITE,
  remote_force: SyncStrategy.CLOUD_OVERWRITE,
  merge_local_primary: SyncStrategy.MERGE_LOCAL,
  merge_remote_primary: SyncStrategy.MERGE_CLOUD,
};

const STRATEGY_TO_MODE: Record<SyncStrategy, string> = {
  [SyncStrategy.LOCAL_OVERWRITE]: 'local_force',
  [SyncStrategy.CLOUD_OVERWRITE]: 'remote_force',
  [SyncStrategy.MERGE_LOCAL]: 'merge_local_primary',
  [SyncStrategy.MERGE_CLOUD]: 'merge_remote_primary',
};

const handleResponse = async <T>(response: Response): Promise<ApiResponse<T>> => {
  try {
    const data = await response.json();
    if (!response.ok) {
      return { data: data as T, status: 'error', message: (data as any)?.detail || response.statusText };
    }
    return { data, status: 'success' };
  } catch (error: any) {
    return { data: {} as T, status: 'error', message: error?.message || 'Unexpected error' };
  }
};

const mapPlaylist = (item: any): Playlist => ({
  id: item.id || `${item.title}-${item.trackCount}`,
  title: item.title ?? item.name ?? 'Unknown',
  trackCount: item.trackCount ?? item.track_count ?? 0,
  lastUpdated: item.lastUpdated || item.last_updated || new Date().toISOString(),
});

const mapLibrary = (item: any): PlexLibrary => ({
  id: item.id ?? item.title,
  title: item.title ?? item.id,
  type: item.type || item.libraryType || item.library_type || item.section?.type || '',
});

// Helper function to map raw rules array to ReplacementRule[]
const mapReplacementRules = (rules: any[]): ReplacementRule[] =>
  (rules || []).map((rule, index) => ({
    id: rule.id || `${rule.search || 'rule'}-${index}-${Date.now()}`,
    search: rule.search || rule.pattern || '',
    replace: rule.replace || rule.replacement || '',
  }));

// Helper function to map API path_mapping response to PathMappingConfig
const mapPathMappingConfig = (data: any): PathMappingConfig => {
  const defaultConfig: PathMappingConfig = {
    mode: PathMappingMode.SIMPLE,
    simple: [],
    regex: {
      localPre: [],
      localPost: [],
      remotePre: [],
      remotePost: []
    }
  };

  if (!data || !data.path_mapping) {
    return defaultConfig;
  }

  const pm = data.path_mapping;
  return {
    mode: pm.mode === 'REGEX' ? PathMappingMode.REGEX : PathMappingMode.SIMPLE,
    simple: mapReplacementRules(pm.simple || []),
    regex: {
      localPre: mapReplacementRules(pm.regex?.localPre || pm.regex?.local_pre || []),
      localPost: mapReplacementRules(pm.regex?.localPost || pm.regex?.local_post || []),
      remotePre: mapReplacementRules(pm.regex?.remotePre || pm.regex?.remote_pre || []),
      remotePost: mapReplacementRules(pm.regex?.remotePost || pm.regex?.remote_post || [])
    }
  };
};

// Helper function to convert PathMappingConfig to API format
const pathMappingToApi = (config: PathMappingConfig) => {
  const rulesToApi = (rules: ReplacementRule[]) =>
    rules.map(({ id, search, replace }) => ({ id, search, replace }));

  return {
    mode: config.mode,
    simple: rulesToApi(config.simple),
    regex: {
      local_pre: rulesToApi(config.regex.localPre),
      local_post: rulesToApi(config.regex.localPost),
      remote_pre: rulesToApi(config.regex.remotePre),
      remote_post: rulesToApi(config.regex.remotePost)
    }
  };
};

export const apiService = {
  async getSettings(): Promise<ApiResponse<{ strategy: SyncStrategy; pathMapping: PathMappingConfig; connection: PlexConnectionSettings; localPath: string }>> {
    const response = await fetch(`${API_BASE}/api/settings`);
    const result = await handleResponse<any>(response);
    if (result.status === 'success') {
      const mode = result.data.sync_mode as string;
      const strategy = MODE_TO_STRATEGY[mode] || SyncStrategy.LOCAL_OVERWRITE;
      const pathMapping = mapPathMappingConfig(result.data);
      const connection: PlexConnectionSettings = {
        protocol: (result.data.scheme as 'http' | 'https') || 'https',
        address: result.data.server_url || '',
        port: result.data.port || '32400',
        token: result.data.token || '',
        libraryName: result.data.library_name || '',
      };
      return { status: 'success', data: { strategy, pathMapping, connection, localPath: result.data.local_path || '' } };
    }
    return result as ApiResponse<any> as ApiResponse<{ strategy: SyncStrategy; pathMapping: PathMappingConfig; connection: PlexConnectionSettings; localPath: string }>;
  },

  async updateSyncStrategy(strategy: SyncStrategy): Promise<ApiResponse<{ sync_mode: string }>> {
    const payload = { mode: STRATEGY_TO_MODE[strategy] };
    const response = await fetch(`${API_BASE}/api/settings/sync-mode`, {
      method: 'PUT',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(payload),
    });
    return handleResponse(response);
  },

  async savePathMapping(config: PathMappingConfig): Promise<ApiResponse<null>> {
    const payload = pathMappingToApi(config);
    const response = await fetch(`${API_BASE}/api/settings/path-mapping`, {
      method: 'PUT',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(payload),
    });
    return handleResponse(response);
  },

  async updateLibrary(libraryName: string): Promise<ApiResponse<{ library_name: string }>> {
    const response = await fetch(`${API_BASE}/api/settings/library`, {
      method: 'PUT',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ library_name: libraryName }),
    });
    return handleResponse(response);
  },

  async getScheduleSettings(): Promise<ApiResponse<ScheduleSettings & { nextRun?: string }>> {
    const response = await fetch(`${API_BASE}/api/schedule`);
    return handleResponse(response);
  },

  async saveScheduleSettings(settings: ScheduleSettings): Promise<ApiResponse<null>> {
    const response = await fetch(`${API_BASE}/api/schedule`, {
      method: 'PUT',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(settings),
    });
    return handleResponse(response);
  },

  async getPlaylists(serverType: ServerType, signal?: AbortSignal, localPath?: string): Promise<ApiResponse<Playlist[]>> {
    const params = new URLSearchParams({ server: serverType.toLowerCase() });
    if (serverType === ServerType.LOCAL && localPath) {
      params.append('local_path', localPath);
    }
    const response = await fetch(`${API_BASE}/api/playlists?${params.toString()}`, { signal });
    const result = await handleResponse<any>(response);
    if (result.status === 'success' && (result.data as any)?.playlists) {
      return { data: (result.data.playlists as any[]).map(mapPlaylist), status: 'success' };
    }
    return result as ApiResponse<Playlist[]>;
  },

  async getServerStatus(signal?: AbortSignal): Promise<ApiResponse<PlexServerConnection>> {
    const response = await fetch(`${API_BASE}/api/server`, { signal });
    const result = await handleResponse<any>(response);
    if (result.status === 'success') {
      const info = result.data.serverInfo || {};
      const libraries: PlexLibrary[] = (result.data.libraries || []).map(mapLibrary);
      return {
        status: 'success',
        data: {
          isConnected: !!info.isConnected,
          name: info.name,
          ip: info.ip,
          port: info.port ? Number(info.port) : undefined,
          libraryName: info.libraryName,
          libraries,
        },
      };
    }
    return result as ApiResponse<PlexServerConnection>;
  },

  async connectToPlex(settings: PlexConnectionSettings, signal?: AbortSignal): Promise<ApiResponse<{ token: string; serverInfo: PlexServerConnection }>> {
    const response = await fetch(`${API_BASE}/api/connect`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({
        protocol: settings.protocol,
        address: settings.address,
        port: settings.port,
        token: settings.token,
        username: settings.username,
        password: settings.password,
        library_name: settings.libraryName,
        timeout: settings.timeout,
      }),
      signal,
    });
    const result = await handleResponse<any>(response);
    if (result.status === 'success') {
      const info = result.data.serverInfo;
      info.libraries = (info.libraries || []).map(mapLibrary);
      return { status: 'success', data: { token: result.data.token, serverInfo: info } };
    }
    return result as ApiResponse<{ token: string; serverInfo: PlexServerConnection }>;
  },

  async syncPlaylists(strategy: SyncStrategy, _pathMapping: PathMappingConfig, localPath?: string): Promise<ApiResponse<null>> {
    const response = await fetch(`${API_BASE}/api/sync`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({
        mode: STRATEGY_TO_MODE[strategy],
        local_path: localPath,
      }),
    });
    return handleResponse(response);
  },

  async getSyncStatus(): Promise<ApiResponse<{ is_syncing: boolean; last_sync_time: string | null; status: string; error: string | null }>> {
    const response = await fetch(`${API_BASE}/api/sync/status`);
    return handleResponse(response);
  },

  async getBackupSettings(): Promise<ApiResponse<BackupSettings>> {
    const response = await fetch(`${API_BASE}/api/backup/settings`);
    const result = await handleResponse<any>(response);
    if (result.status === 'success') {
      return {
        status: 'success',
        data: {
          enabled: result.data.enabled ?? false,
          retentionCount: result.data.retention_count ?? 5,
        },
      };
    }
    return result as ApiResponse<BackupSettings>;
  },

  async saveBackupSettings(settings: BackupSettings): Promise<ApiResponse<null>> {
    const response = await fetch(`${API_BASE}/api/backup/settings`, {
      method: 'PUT',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({
        enabled: settings.enabled,
        retention_count: settings.retentionCount,
      }),
    });
    return handleResponse(response);
  },
};