/**
 * API Client
 * Centralized HTTP client for backend communication
 */

import CONFIG from '../config.js';

class APIClient {
  constructor() {
    this.baseURL = CONFIG.API.BASE_URL;
    this.timeout = CONFIG.API.TIMEOUT;
    this.currentProjectId = 1; // Default project
  }

  /**
   * Set current project ID
   */
  setProjectId(projectId) {
    this.currentProjectId = projectId;
  }

  /**
   * Generic HTTP request with error handling
   * @private
   */
  async request(url, options = {}) {
    const controller = new AbortController();
    const timeoutId = setTimeout(() => controller.abort(), this.timeout);

    try {
      const response = await fetch(this.baseURL + url, {
        headers: {
          'Content-Type': 'application/json',
          ...options.headers
        },
        signal: controller.signal,
        ...options
      });

      clearTimeout(timeoutId);

      if (!response.ok) {
        const error = await response.json();
        throw new Error(error.error || `HTTP ${response.status}: ${response.statusText}`);
      }

      return await response.json();
    } catch (err) {
      clearTimeout(timeoutId);

      if (err.name === 'AbortError') {
        throw new Error('Request timeout - server is not responding');
      }

      throw err;
    }
  }

  // ==================== PROJECTS ====================

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

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

  async createProject(name, description = '') {
    return this.request('/api/projects', {
      method: 'POST',
      body: JSON.stringify({ name, description })
    });
  }

  async updateProject(id, name, description) {
    return this.request(`/api/projects/${id}`, {
      method: 'PUT',
      body: JSON.stringify({ name, description })
    });
  }

  async deleteProject(id) {
    return this.request(`/api/projects/${id}`, { method: 'DELETE' });
  }

  // ==================== RACKS ====================

  async getRacks(projectId = this.currentProjectId) {
    return this.request(`/api/racks?projectId=${projectId}`);
  }

  async getNextRackName(prefix = 'RACK', projectId = this.currentProjectId) {
    const data = await this.request(`/api/racks/next-name?projectId=${projectId}&prefix=${prefix}`);
    return data.name;
  }

  async createRack(name, x, y, projectId = this.currentProjectId) {
    return this.request('/api/racks', {
      method: 'POST',
      body: JSON.stringify({ projectId, name, x, y })
    });
  }

  async updateRackPosition(id, x, y) {
    return this.request(`/api/racks/${id}/position`, {
      method: 'PUT',
      body: JSON.stringify({ x, y })
    });
  }

  async updateRackName(id, name) {
    return this.request(`/api/racks/${id}/name`, {
      method: 'PUT',
      body: JSON.stringify({ name })
    });
  }

  async deleteRack(id) {
    return this.request(`/api/racks/${id}`, { method: 'DELETE' });
  }

  // ==================== DEVICE TYPES ====================

  async getDeviceTypes() {
    return this.request('/api/devices/types');
  }

  // ==================== DEVICES ====================

  async getDevices(projectId = this.currentProjectId) {
    return this.request(`/api/devices?projectId=${projectId}`);
  }

  async createDevice(deviceTypeId, rackId, position, name) {
    return this.request('/api/devices', {
      method: 'POST',
      body: JSON.stringify({ deviceTypeId, rackId, position, name })
    });
  }

  async updateDeviceRack(id, rackId, position) {
    return this.request(`/api/devices/${id}/rack`, {
      method: 'PUT',
      body: JSON.stringify({ rackId, position })
    });
  }

  async updateDeviceLogicalPosition(id, x, y) {
    return this.request(`/api/devices/${id}/logical-position`, {
      method: 'PUT',
      body: JSON.stringify({ x, y })
    });
  }

  async updateDeviceName(id, name) {
    return this.request(`/api/devices/${id}/name`, {
      method: 'PUT',
      body: JSON.stringify({ name })
    });
  }

  async updateDeviceRackUnits(id, rackUnits) {
    return this.request(`/api/devices/${id}/rack-units`, {
      method: 'PUT',
      body: JSON.stringify({ rackUnits })
    });
  }

  async getUsedPorts(deviceId) {
    return this.request(`/api/devices/${deviceId}/used-ports`);
  }

  async deleteDevice(id) {
    return this.request(`/api/devices/${id}`, { method: 'DELETE' });
  }

  // ==================== CONNECTIONS ====================

  async getConnections(projectId = this.currentProjectId) {
    return this.request(`/api/connections?projectId=${projectId}`);
  }

  async createConnection(sourceDeviceId, sourcePort, targetDeviceId, targetPort) {
    return this.request('/api/connections', {
      method: 'POST',
      body: JSON.stringify({ sourceDeviceId, sourcePort, targetDeviceId, targetPort })
    });
  }

  async updateConnection(id, sourceDeviceId, sourcePort, targetDeviceId, targetPort) {
    return this.request(`/api/connections/${id}`, {
      method: 'PUT',
      body: JSON.stringify({ sourceDeviceId, sourcePort, targetDeviceId, targetPort })
    });
  }

  async updateConnectionWaypoints(id, waypoints, view = null) {
    return this.request(`/api/connections/${id}/waypoints`, {
      method: 'PUT',
      body: JSON.stringify({ waypoints, view })
    });
  }

  async deleteConnection(id) {
    return this.request(`/api/connections/${id}`, { method: 'DELETE' });
  }

  // ==================== HEALTH CHECK ====================

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

// Export singleton instance
export default new APIClient();