import axios from 'axios';
import { getToken, clearAuth } from './auth';

export const getBackendUrl = () => {
  if (typeof window === 'undefined') return 'http://localhost:8000';

  const host = window.location.hostname;

  // If we are on HTTPS (Proxy/Mobile mode), we use port 3002 for the backend
  if (window.location.protocol === 'https:') {
    if (host.includes('.loca.lt')) {
       return 'https://inventory-ai-api.loca.lt';
    }
    return `https://${host}:3002`;
  }

  return `http://${host}:8000`;
};

/**
 * [C-01] Axios instance cu JWT Bearer token în header
 * și interceptor pentru 401 Unauthorized (token expired)
 */
const axiosInstance = axios.create({
  baseURL: getBackendUrl()
});

axiosInstance.interceptors.request.use((config) => {
  const token = getToken();
  if (token) {
    config.headers.Authorization = `Bearer ${token}`;
  }
  return config;
}, (error) => Promise.reject(error));

axiosInstance.interceptors.response.use(
  (response) => response,
  (error) => {
    // [L-01] Handle 401 Unauthorized — token expired
    if (error.response?.status === 401) {
      clearAuth();
      if (typeof window !== 'undefined') {
        window.location.href = '/login';
      }
    }
    return Promise.reject(error);
  }
);

export const inventoryApi = {
  getItems: async () => {
    const res = await axiosInstance.get('/items/');
    return res.data;
  },

  getStats: async () => {
    const res = await axiosInstance.get('/items/stats');
    return res.data;
  },

  syncBulkOperations: async (userId: number, operations: any[]) => {
    try {
      const res = await axiosInstance.post('/operations/bulk-sync', {
        user_id: userId,
        operations: operations
      });
      return res.data;
    } catch (err: any) {
      console.error("Sync API Error:", err);
      if (err.response?.status === 404) {
         throw new Error(`404: Endpoint not found`);
      }
      throw err;
    }
  },

  analyzeLabel: async (formData: FormData) => {
    const res = await axiosInstance.post('/items/extract-label', formData, {
      headers: { 'Content-Type': 'multipart/form-data' }
    });
    return res.data;
  },

  createItem: async (userId: number, itemData: any) => {
    const res = await axiosInstance.post('/items/', itemData);
    return res.data;
  },

  updateItem: async (itemId: number, itemData: any) => {
    const res = await axiosInstance.put(`/items/${itemId}`, itemData);
    return res.data;
  },

  adjustStock: async (endpoint: string, data: any) => {
    const res = await axiosInstance.post(`/operations/${endpoint}`, data);
    return res.data;
  },

  deleteItem: async (itemId: number) => {
    const res = await axiosInstance.delete(`/items/${itemId}`);
    return res.data;
  },

  getAuditLogs: async (limit: number = 50) => {
    const res = await axiosInstance.get('/operations/logs', { params: { limit } });
    return res.data;
  },

  // Users
  getUsers: async () => {
    // [C-01] Public endpoint — use plain axios to avoid JWT interceptor
    const res = await axios.get(`${getBackendUrl()}/users/`);
    return res.data;
  },

  createUser: async (userData: any) => {
    const res = await axiosInstance.post('/users/', userData);
    return res.data;
  },

  login: async (credentials: any) => {
    // [C-01] Login endpoint — NU adaug token header (login e public)
    const res = await axios.post(`${getBackendUrl()}/users/login`, credentials);
    return res.data;
  },

  deleteUser: async (userId: number) => {
    const res = await axiosInstance.delete(`/users/${userId}`);
    return res.data;
  },

  updateUser: async (userId: number, data: any) => {
    const res = await axiosInstance.put(`/users/${userId}`, data);
    return res.data;
  },

  getLdapConfig: async () => {
    const res = await axiosInstance.get('/users/ldap-config');
    return res.data;
  },
  updateLdapConfig: async (config: any) => {
    const res = await axiosInstance.post('/users/ldap-config', config);
    return res.data;
  },
  testLdapConnection: async (config: any) => {
    const res = await axiosInstance.post('/users/test-ldap', config);
    return res.data;
  },

  // Categories
  getCategories: async () => {
    const res = await axiosInstance.get('/categories/');
    return res.data;
  },
  createCategory: async (data: any) => {
    const res = await axiosInstance.post('/categories/', data);
    return res.data;
  },
  updateCategory: async (id: number, data: any) => {
    const res = await axiosInstance.put(`/categories/${id}`, data);
    return res.data;
  },
  deleteCategory: async (id: number) => {
    const res = await axiosInstance.delete(`/categories/${id}`);
    return res.data;
  }
};