/**
 * Application Configuration
 * 
 * This file contains all configuration settings for the frontend application.
 * Centralized configuration makes it easier to manage environment-specific settings.
 */

// =============================================================================
// Environment Configuration
// =============================================================================

/**
 * Set to true to use mock data instead of real backend calls.
 * Useful for development and testing without a running backend.
 */
export const NO_BACKEND_MODE = false;

/**
 * Enable debug logging for API calls
 */
export const DEBUG_MODE = true;

// =============================================================================
// API Configuration
// =============================================================================

/**
 * Base URL for the backend API server
 */
export const API_BASE_URL = 'http://localhost:8000';

/**
 * API request timeout in milliseconds
 */
export const API_TIMEOUT = 30000;

/**
 * API Endpoints
 * All backend API routes are defined here for easy reference and maintenance.
 */
export const API_ENDPOINTS = {
  // Authentication
  AUTH: {
    LOGIN: '/login',
    REGISTER: '/register',
  },

  // Assets Management
  ASSETS: {
    GET: '/assets/get',
    CREATE: '/assets/create',
    CLAIM: '/assets/claim',
    ASSIGN: '/assets/assign',
    DELETE: '/assets/delete',
  },

  // AI Services
  AI: {
    PROXY: '/ai/proxy',
    GET_ROLES: '/get_ai_roles',
  },

  // Admin Operations
  ADMIN: {
    DECLARE_GUALE: '/admin/declare-guale',
  },
} as const;

// =============================================================================
// Vault storage (user-isolated, multi-account)
// =============================================================================
// - AsyncStorage keys for vault state (S0 share, initialized flag, mnemonic part backup).
// - User-scoped: each account has its own keys so vault/mnemonic state is isolated.
// - Store: use getVaultStorageKeys(userId) and write to INITIALIZED / SHARE_DEVICE / MNEMONIC_PART_LOCAL.
// - Clear: use same keys in multiRemove (e.g. MeScreen Reset Vault State).
// - Multi-account: same device, multiple users → each has independent vault (no cross-user leakage).

const VAULT_KEY_PREFIX = 'sentinel_vault';

/** Base key names (for reference). Prefer getVaultStorageKeys(userId) for all reads/writes. */
export const VAULT_STORAGE_KEYS = {
  INITIALIZED: 'sentinel_vault_initialized',
  SHARE_DEVICE: 'sentinel_vault_s0',
  MNEMONIC_PART_LOCAL: 'sentinel_mnemonic_part_local',
} as const;

/**
 * Returns vault storage keys for the given user (user isolation).
 * - Use for: reading/writing S0, mnemonic part backup, clearing on Reset Vault State.
 * - userId null → guest namespace (_guest). userId set → per-user namespace (_u{userId}).
 */
export function getVaultStorageKeys(userId: number | string | null): {
  INITIALIZED: string;
  SHARE_DEVICE: string;
  MNEMONIC_PART_LOCAL: string;
  AES_KEY: string;
  SHARE_SERVER: string;
  SHARE_HEIR: string;
} {
  const suffix = userId != null ? `_u${userId}` : '_guest';
  return {
    INITIALIZED: `${VAULT_KEY_PREFIX}_initialized${suffix}`,
    SHARE_DEVICE: `${VAULT_KEY_PREFIX}_s0${suffix}`,
    MNEMONIC_PART_LOCAL: `sentinel_mnemonic_part_local${suffix}`,
    AES_KEY: `sentinel_aes_key${suffix}`,
    SHARE_SERVER: `sentinel_share_server${suffix}`,
    SHARE_HEIR: `sentinel_share_heir${suffix}`,
  };
}

// =============================================================================
// Helper Functions
// =============================================================================

/**
 * Build full API URL from endpoint
 * @param endpoint - API endpoint path (e.g., '/login')
 * @returns Full URL (e.g., 'http://192.168.56.103:8000/login')
 */
export function buildApiUrl(endpoint: string): string {
  return `${API_BASE_URL}${endpoint}`;
}

/**
 * Get default headers for API requests
 * @param token - Optional JWT token for authenticated requests
 * @returns Headers object
 */
export function getApiHeaders(token?: string): Record<string, string> {
  const headers: Record<string, string> = {
    'Content-Type': 'application/json',
  };

  if (token) {
    headers['Authorization'] = `Bearer ${token}`;
  }

  return headers;
}

/**
 * Log API debug information
 * Only logs when DEBUG_MODE is enabled
 */
export function logApiDebug(label: string, data: unknown): void {
  if (DEBUG_MODE) {
    console.log(`[API Debug] ${label}:`, data);
  }
}

// =============================================================================
// Mock User Configuration (for NO_BACKEND_MODE)
// =============================================================================

export const MOCK_CONFIG = {
  USER: {
    id: 999,
    username: 'MockCaptain',
    email: 'captain@sentinel.local',
    public_key: 'mock_public_key',
    is_admin: true,
    guale: false,
    tier: 'premium',
    tier_expires_at: '2026-12-31T23:59:59Z',
    last_active_at: new Date().toISOString(),
  },
  ACCESS_TOKEN: 'mock_access_token',
  RESPONSE_DELAY: 200, // milliseconds
} as const;

// =============================================================================
// AI Service Configuration
// =============================================================================

export const AI_CONFIG = {
  /**
   * Default system prompt for AI conversations
   */
  DEFAULT_SYSTEM_PROMPT: 'You are a helpful journal assistant. Help the user reflect on their thoughts and feelings.',

  /**
   * Mock response delay in milliseconds (for NO_BACKEND_MODE)
   */
  MOCK_RESPONSE_DELAY: 500,

  /**
   * AI Roles configuration
   */
  ROLES: [
    {
      id: 'reflective',
      name: 'Reflective Assistant',
      description: 'Helps you dive deep into your thoughts and feelings through meaningful reflection.',
      systemPrompt: 'You are a helpful journal assistant. Help the user reflect on their thoughts and feelings.',
      icon: 'journal-outline',
      iconFamily: 'Ionicons',
    },
    {
      id: 'creative',
      name: 'Creative Spark',
      description: 'A partner for brainstorming, creative writing, and exploring new ideas.',
      systemPrompt: 'You are a creative brainstorming partner. Help the user explore new ideas, write stories, or look at things from a fresh perspective.',
      icon: 'bulb-outline',
      iconFamily: 'Ionicons',
    },
    {
      id: 'planner',
      name: 'Action Planner',
      description: 'Focused on turning thoughts into actionable plans and organized goals.',
      systemPrompt: 'You are a productivity coach. Help the user break down their thoughts into actionable steps and clear goals.',
      icon: 'list-outline',
      iconFamily: 'Ionicons',
    },
    {
      id: 'empathetic',
      name: 'Empathetic Guide',
      description: 'Provides a safe, non-judgmental space for emotional support and empathy.',
      systemPrompt: 'You are a supportive and empathetic friend. Listen to the user\'s concerns and provide emotional support without judgment.',
      icon: 'heart-outline',
      iconFamily: 'Ionicons',
    },
  ],
} as const;

// =============================================================================
// Export Type Definitions
// =============================================================================

export type ApiEndpoint = typeof API_ENDPOINTS;