/**
 * Design System Server (DSS) - API Client
 *
 * Centralized API communication layer.
 * No mocks - requires backend connection.
 */

const API_BASE = '/api';

class ApiClient {
  constructor(baseUrl = API_BASE) {
    this.baseUrl = baseUrl;
    this.defaultHeaders = {
      'Content-Type': 'application/json'
    };
    this.connected = null;
  }

  setAuthToken(token) {
    if (token) {
      this.defaultHeaders['Authorization'] = `Bearer ${token}`;
    } else {
      delete this.defaultHeaders['Authorization'];
    }
  }

  async request(endpoint, options = {}) {
    const url = `${this.baseUrl}${endpoint}`;
    const config = {
      ...options,
      headers: {
        ...this.defaultHeaders,
        ...options.headers
      }
    };

    const response = await fetch(url, config);

    if (!response.ok) {
      const error = await response.json().catch(() => ({ message: response.statusText }));
      throw new ApiError(error.detail || error.message || 'Request failed', response.status, error);
    }

    const text = await response.text();
    return text ? JSON.parse(text) : null;
  }

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

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

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

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

  // === Domain Methods ===

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

  async getProjects() {
    return this.get('/projects');
  }

  async getProject(id) {
    return this.get(`/projects/${id}`);
  }

  async createProject(data) {
    return this.post('/projects', data);
  }

  async updateProject(id, data) {
    return this.put(`/projects/${id}`, data);
  }

  async deleteProject(id) {
    return this.delete(`/projects/${id}`);
  }

  async ingestFigma(fileKey, options = {}) {
    return this.post('/ingest/figma', { file_key: fileKey, ...options });
  }

  async visualDiff(baseline, current) {
    return this.post('/visual-diff', { baseline, current });
  }

  async getFigmaTasks() {
    return this.get('/figma-bridge/tasks');
  }

  async sendFigmaTask(task) {
    return this.post('/figma-bridge/tasks', task);
  }

  async getConfig() {
    return this.get('/config');
  }

  async updateConfig(config) {
    return this.put('/config', config);
  }

  async getFigmaConfig() {
    return this.get('/config/figma');
  }

  async setFigmaToken(token) {
    return this.put('/config', { figma_token: token });
  }

  async testFigmaConnection() {
    return this.post('/config/figma/test', {});
  }

  async getServices() {
    return this.get('/services');
  }

  async configureService(serviceName, config) {
    return this.put(`/services/${serviceName}`, config);
  }

  async getStorybookStatus() {
    return this.get('/services/storybook');
  }

  async getMode() {
    return this.get('/mode');
  }

  async setMode(mode) {
    return this.put('/mode', { mode });
  }

  async getStats() {
    return this.get('/stats');
  }

  async getActivity(limit = 50) {
    return this.get(`/activity?limit=${limit}`);
  }

  async executeMCPTool(toolName, params = {}) {
    return this.post(`/mcp/${toolName}`, params);
  }

  async getQuickWins(path = '.') {
    return this.post('/mcp/get_quick_wins', { path });
  }

  async analyzeProject(path = '.') {
    return this.post('/mcp/discover_project', { path });
  }
}

class ApiError extends Error {
  constructor(message, status, data) {
    super(message);
    this.name = 'ApiError';
    this.status = status;
    this.data = data;
  }
}

const api = new ApiClient();

export { api, ApiClient, ApiError };
export default api;