/**
 * Platform Service Composable for TimeSafari
 * 
 * Provides centralized access to platform-specific services across Vue components.
 * This composable encapsulates the singleton pattern and provides a clean interface
 * for components to access platform functionality without directly managing
 * the PlatformServiceFactory.
 * 
 * Benefits:
 * - Centralized service access
 * - Better testability with easy mocking
 * - Cleaner component code
 * - Type safety with TypeScript
 * - Reactive capabilities if needed in the future
 * 
 * @author Matthew Raymer
 * @version 1.0.0
 * @since 2025-07-02
 */

import { ref, readonly } from 'vue';
import { PlatformServiceFactory } from '@/services/PlatformServiceFactory';
import type { PlatformService } from '@/services/PlatformService';
import * as databaseUtil from '@/db/databaseUtil';
import { Contact } from '@/db/tables/contacts';

/**
 * Reactive reference to the platform service instance
 * This allows for potential reactive features in the future
 */
const platformService = ref<PlatformService | null>(null);

/**
 * Flag to track if service has been initialized
 */
const isInitialized = ref(false);

/**
 * Initialize the platform service if not already done
 */
function initializePlatformService(): PlatformService {
  if (!platformService.value) {
    platformService.value = PlatformServiceFactory.getInstance();
    isInitialized.value = true;
  }
  return platformService.value;
}

/**
 * Platform Service Composable
 * 
 * Provides access to platform-specific services in a composable pattern.
 * This is the recommended way for Vue components to access platform functionality.
 * 
 * @returns Object containing platform service and utility functions
 * 
 * @example
 * ```typescript
 * // In a Vue component
 * import { usePlatformService } from '@/utils/usePlatformService';
 * 
 * export default {
 *   setup() {
 *     const { platform, dbQuery, dbExec, takePicture } = usePlatformService();
 *     
 *     // Use platform methods directly
 *     const takePhoto = async () => {
 *       const result = await takePicture();
 *       console.log('Photo taken:', result);
 *     };
 *     
 *     return { takePhoto };
 *   }
 * };
 * ```
 */
export function usePlatformService() {
  // Initialize service on first use
  const service = initializePlatformService();

  /**
   * Safely serialize parameters to avoid Proxy objects in native bridges
   * Vue's reactivity system can wrap arrays in Proxy objects which cause
   * "An object could not be cloned" errors in Capacitor
   */
  const safeSerializeParams = (params?: unknown[]): unknown[] => {
    if (!params) return [];
    
    console.log('[usePlatformService] Original params:', params);
    console.log('[usePlatformService] Params toString:', params.toString());
    console.log('[usePlatformService] Params constructor:', params.constructor?.name);
    
    // Use the most aggressive approach: JSON round-trip + spread operator
    try {
      // Method 1: JSON round-trip to completely strip any Proxy
      const jsonSerialized = JSON.parse(JSON.stringify(params));
      console.log('[usePlatformService] JSON serialized:', jsonSerialized);
      
      // Method 2: Spread operator to create new array
      const spreadArray = [...jsonSerialized];
      console.log('[usePlatformService] Spread array:', spreadArray);
      
      // Method 3: Force primitive extraction for each element
      const finalParams = spreadArray.map((param, index) => {
        if (param === null || param === undefined) {
          return param;
        }
        
        // Force convert to primitive value
        if (typeof param === 'object') {
          if (Array.isArray(param)) {
            return [...param]; // Spread to new array
          } else {
            return { ...param }; // Spread to new object
          }
        }
        
        return param;
      });
      
      console.log('[usePlatformService] Final params:', finalParams);
      console.log('[usePlatformService] Final params toString:', finalParams.toString());
      console.log('[usePlatformService] Final params constructor:', finalParams.constructor?.name);
      
      return finalParams;
    } catch (error) {
      console.error('[usePlatformService] Serialization error:', error);
      // Fallback: manual extraction
      const fallbackParams: unknown[] = [];
      for (let i = 0; i < params.length; i++) {
        try {
          // Try to access the value directly
          const value = params[i];
          fallbackParams.push(value);
        } catch (accessError) {
          console.error('[usePlatformService] Access error for param', i, ':', accessError);
          fallbackParams.push(String(params[i]));
        }
      }
      console.log('[usePlatformService] Fallback params:', fallbackParams);
      return fallbackParams;
    }
  };

  /**
   * Database query method with proper typing and safe parameter serialization
   */
  const dbQuery = async (sql: string, params?: unknown[]) => {
    const safeParams = safeSerializeParams(params);
    return await service.dbQuery(sql, safeParams);
  };

  /**
   * Database execution method with proper typing and safe parameter serialization
   */
  const dbExec = async (sql: string, params?: unknown[]) => {
    const safeParams = safeSerializeParams(params);
    return await service.dbExec(sql, safeParams);
  };

  /**
   * Get single row from database with proper typing and safe parameter serialization
   */
  const dbGetOneRow = async (sql: string, params?: unknown[]) => {
    const safeParams = safeSerializeParams(params);
    return await service.dbGetOneRow(sql, safeParams);
  };

  /**
   * Take picture with platform-specific implementation
   */
  const takePicture = async () => {
    return await service.takePicture();
  };

  /**
   * Pick image from device with platform-specific implementation
   */
  const pickImage = async () => {
    return await service.pickImage();
  };

  /**
   * Get platform capabilities
   */
  const getCapabilities = () => {
    return service.getCapabilities();
  };

  /**
   * Platform detection methods using capabilities
   */
  const isWeb = () => {
    const capabilities = service.getCapabilities();
    return !capabilities.isNativeApp;
  };
  
  const isCapacitor = () => {
    const capabilities = service.getCapabilities();
    return capabilities.isNativeApp && capabilities.isMobile;
  };
  
  const isElectron = () => {
    const capabilities = service.getCapabilities();
    return capabilities.isNativeApp && !capabilities.isMobile;
  };

  /**
   * File operations (where supported)
   */
  const readFile = async (path: string) => {
    return await service.readFile(path);
  };

  const writeFile = async (path: string, content: string) => {
    return await service.writeFile(path, content);
  };

  const deleteFile = async (path: string) => {
    return await service.deleteFile(path);
  };

  const listFiles = async (directory: string) => {
    return await service.listFiles(directory);
  };

  /**
   * Camera operations
   */
  const rotateCamera = async () => {
    return await service.rotateCamera();
  };

  /**
   * Deep link handling
   */
  const handleDeepLink = async (url: string) => {
    return await service.handleDeepLink(url);
  };

  /**
   * File sharing
   */
  const writeAndShareFile = async (fileName: string, content: string) => {
    return await service.writeAndShareFile(fileName, content);
  };

  // ========================================
  // Higher-level database operations
  // ========================================

  /**
   * Get all contacts from database with proper typing
   * @returns Promise<Contact[]> Typed array of contacts
   */
  const getContacts = async (): Promise<Contact[]> => {
    const result = await dbQuery("SELECT * FROM contacts ORDER BY name");
    return databaseUtil.mapQueryResultToValues(result) as Contact[];
  };

  /**
   * Get contacts with content visibility filter
   * @param showBlocked Whether to include blocked contacts
   * @returns Promise<Contact[]> Filtered contacts
   */
  const getContactsWithFilter = async (showBlocked = true): Promise<Contact[]> => {
    const contacts = await getContacts();
    return showBlocked ? contacts : contacts.filter(c => c.iViewContent !== false);
  };

  /**
   * Get user settings with proper typing
   * @returns Promise with all user settings
   */
  const getSettings = async () => {
    return await databaseUtil.retrieveSettingsForActiveAccount();
  };

  /**
   * Save default settings
   * @param settings Partial settings object to update
   */
  const saveSettings = async (settings: Partial<any>) => {
    return await databaseUtil.updateDefaultSettings(settings);
  };

  /**
   * Save DID-specific settings
   * @param did DID identifier
   * @param settings Partial settings object to update
   */
  const saveDidSettings = async (did: string, settings: Partial<any>) => {
    return await databaseUtil.updateDidSpecificSettings(did, settings);
  };

  /**
   * Get account by DID
   * @param did DID identifier
   * @returns Account data or null if not found
   */
  const getAccount = async (did?: string) => {
    if (!did) return null;
    const result = await dbQuery("SELECT * FROM accounts WHERE did = ? LIMIT 1", [did]);
    const mappedResults = databaseUtil.mapQueryResultToValues(result);
    return mappedResults.length > 0 ? mappedResults[0] : null;
  };

  /**
   * Log activity message to database
   * @param message Activity message to log
   */
  const logActivity = async (message: string) => {
    const timestamp = new Date().toISOString();
    await dbExec("INSERT INTO logs (date, message) VALUES (?, ?)", [timestamp, message]);
  };

  return {
    // Direct service access (for advanced use cases)
    platform: readonly(platformService),
    isInitialized: readonly(isInitialized),
    
    // Database operations (low-level)
    dbQuery,
    dbExec, 
    dbGetOneRow,
    
    // Database operations (high-level)
    getContacts,
    getContactsWithFilter,
    getSettings,
    saveSettings,
    saveDidSettings,
    getAccount,
    logActivity,
    
    // Media operations
    takePicture,
    pickImage,
    rotateCamera,
    
    // Platform detection
    isWeb,
    isCapacitor, 
    isElectron,
    getCapabilities,
    
    // File operations
    readFile,
    writeFile,
    deleteFile,
    listFiles,
    writeAndShareFile,
    
    // Navigation
    handleDeepLink,
    
    // Raw service access for cases not covered above
    service
  };
}

/**
 * Type helper for the composable return type
 */
export type PlatformServiceComposable = ReturnType<typeof usePlatformService>;