/**
 * API Client Service
 * 統一的 API 請求處理
 */

const API_BASE_URL = import.meta.env.VITE_API_URL || 'http://localhost:3001';

class ApiClient {
  constructor() {
    this.baseURL = API_BASE_URL;
  }

  async request(endpoint, options = {}) {
    const url = `${this.baseURL}${endpoint}`;
    const config = {
      credentials: 'include', // 重要: 發送 cookies (session)
      headers: {
        'Content-Type': 'application/json',
        ...options.headers,
      },
      ...options,
    };

    try {
      const response = await fetch(url, config);
      const data = await response.json();

      if (!response.ok) {
        throw new Error(data.error || data.message || 'Request failed');
      }

      return data;
    } catch (error) {
      // 只對非認證錯誤顯示控制台訊息
      if (!endpoint.includes('/auth/me') || !error.message.includes('未登入')) {
        console.error('API Error:', error);
      }
      throw error;
    }
  }

  // GET request
  get(endpoint, options = {}) {
    return this.request(endpoint, {
      method: 'GET',
      ...options,
    });
  }

  // POST request
  post(endpoint, data, options = {}) {
    return this.request(endpoint, {
      method: 'POST',
      body: JSON.stringify(data),
      ...options,
    });
  }

  // PUT request
  put(endpoint, data, options = {}) {
    return this.request(endpoint, {
      method: 'PUT',
      body: JSON.stringify(data),
      ...options,
    });
  }

  // DELETE request
  delete(endpoint, options = {}) {
    return this.request(endpoint, {
      method: 'DELETE',
      ...options,
    });
  }

  // ============================================
  // Authentication APIs
  // ============================================

  async login(identifier, password) {
    return this.post('/api/auth/login', { identifier, password });
  }

  async logout() {
    return this.post('/api/auth/logout');
  }

  async getCurrentUser() {
    return this.get('/api/auth/me');
  }

  async changePassword(oldPassword, newPassword) {
    return this.post('/api/auth/change-password', { oldPassword, newPassword });
  }

  // ============================================
  // Analysis APIs
  // ============================================

  async createAnalysis(finding, jobContent, outputLanguage = 'zh-TW') {
    return this.post('/api/analyze', { finding, jobContent, outputLanguage });
  }

  async translateAnalysis(analysisId, targetLanguage) {
    return this.post('/api/analyze/translate', { analysisId, targetLanguage });
  }

  async getAnalysisHistory(page = 1, limit = 10, filters = {}) {
    const params = new URLSearchParams({
      page: page.toString(),
      limit: limit.toString(),
      ...filters,
    });
    return this.get(`/api/analyze/history?${params}`);
  }

  async getAnalysisDetail(id) {
    return this.get(`/api/analyze/${id}`);
  }

  async deleteAnalysis(id) {
    return this.delete(`/api/analyze/${id}`);
  }

  // ============================================
  // Admin APIs
  // ============================================

  async getDashboard() {
    return this.get('/api/admin/dashboard');
  }

  async getUsers(page = 1, limit = 10, filters = {}) {
    const params = new URLSearchParams({
      page: page.toString(),
      limit: limit.toString(),
      ...filters,
    });
    return this.get(`/api/admin/users?${params}`);
  }

  async createUser(userData) {
    return this.post('/api/admin/users', userData);
  }

  async updateUser(id, userData) {
    return this.put(`/api/admin/users/${id}`, userData);
  }

  async deleteUser(id) {
    return this.delete(`/api/admin/users/${id}`);
  }

  async getAllAnalyses(page = 1, limit = 10, filters = {}) {
    const params = new URLSearchParams({
      page: page.toString(),
      limit: limit.toString(),
      ...filters,
    });
    return this.get(`/api/admin/analyses?${params}`);
  }

  async getAuditLogs(page = 1, limit = 10, filters = {}) {
    const params = new URLSearchParams({
      page: page.toString(),
      limit: limit.toString(),
      ...filters,
    });
    return this.get(`/api/admin/audit-logs?${params}`);
  }

  async getStatistics() {
    return this.get('/api/admin/statistics');
  }

  // ============================================
  // LLM Configuration APIs
  // ============================================

  async getLLMConfigs() {
    return this.get('/api/llm-config');
  }

  async getActiveLLMConfig() {
    return this.get('/api/llm-config/active');
  }

  async createLLMConfig(configData) {
    return this.post('/api/llm-config', configData);
  }

  async updateLLMConfig(id, configData) {
    return this.put(`/api/llm-config/${id}`, configData);
  }

  async activateLLMConfig(id) {
    return this.put(`/api/llm-config/${id}/activate`, {});
  }

  async deleteLLMConfig(id) {
    return this.delete(`/api/llm-config/${id}`);
  }

  async testLLMConfig(configData) {
    return this.post('/api/llm-config/test', configData);
  }

  // ============================================
  // Health Check
  // ============================================

  async healthCheck() {
    return this.get('/health');
  }

  async dbHealthCheck() {
    return this.get('/health/db');
  }
}

// 建立單例
const api = new ApiClient();

export default api;