// Employee interface
import { API_BASE_URL } from '@/config';
import axios, { isAxiosError } from 'axios';
import { createHeaders } from '@/lib/api';
import apiClient from '@/lib/api/axios-instance';

export interface Employee {
  id: number;
  empCode: string;
  firstName: string;
  middleName: string;
  lastName: string;
  email: string;
  mobile: string;
  type: string;
  academics: string;
  financialData: string;
  description: string;
  userId: number;
  passwordHash: string;
  roleId: number;
  avatarUrl: string;
  status: string;
  reportingToId?: number | null;
}

// Employee API service
export const employeeApi = {
  getAll: async (): Promise<Employee[]> => {
    try {
      console.log('Employee API: Fetching all employees from', `${API_BASE_URL}/api/employee`);
      const response = await apiClient.get(`/api/employee`);

      console.log(`Employee API: Successfully fetched ${response.data.length} employees`);
      return response.data;
    } catch (error) {
      console.error('Employee API: Error fetching employees:', error);
      
      if (isAxiosError(error) && error.message.includes('Network Error')) {
        console.error('Employee API: Possible CORS or network connectivity issue');
      }
      
      return []; // Return empty array on error for graceful degradation
    }
  },
  getAllForAdmin: async (): Promise<Employee[]> => {
    try {
      console.log('Employee API: Fetching all employees from', `${API_BASE_URL}/api/employee`);
      const response = await apiClient.get(`/api/employee/GetAllForAdmin`);
      console.log('Raw API response for employees:', response.data);
      console.log(`Employee API: Successfully fetched ${response.data.length} employees`);
      return response.data;
    } catch (error) {
      console.error('Employee API: Error fetching employees:', error);
      
      if (isAxiosError(error) && error.message.includes('Network Error')) {
        console.error('Employee API: Possible CORS or network connectivity issue');
      }
      
      return []; // Return empty array on error for graceful degradation
    }
  },
  
  getById: async (id: number): Promise<{success: boolean; data?: Employee; message?: string}> => {
    try {
      console.log(`Employee API: Fetching employee with ID ${id} from`, `${API_BASE_URL}/api/employee/${id}`);
      const response = await apiClient.get(`/api/employee/${id}`);

      console.log(`Employee API: Successfully fetched employee with ID ${id}`);
      console.log('Employee data structure:', JSON.stringify(response.data, null, 2));
      
      return {
        success: true,
        data: response.data
      };
    } catch (error) {
      console.error(`Employee API: Error fetching employee with ID ${id}:`, error);
      const errorMessage = isAxiosError(error) 
        ? `Failed to fetch employee: ${error.response?.status} ${error.message}`
        : `Error fetching employee: ${error instanceof Error ? error.message : 'Unknown error'}`;
      
      return {
        success: false,
        message: errorMessage
      };
    }
  },

  getByRoleId: async (roleId: number): Promise<{success: boolean; data: Employee[]; message?: string}> => {
    try {
      console.log(`Employee API: Fetching employees with role ID ${roleId} from`, `${API_BASE_URL}/api/employee/byrole/${roleId}`);
      const response = await apiClient.get(`/api/employee/byrole/${roleId}`);

      console.log(`Employee API: Successfully fetched ${response.data.length} employees with role ID ${roleId}`);
      return {
        success: true,
        data: response.data
      };
    } catch (error) {
      console.error(`Employee API: Error fetching employees with role ID ${roleId}:`, error);
      const errorMessage = isAxiosError(error)
        ? `Failed to fetch employees by role: ${error.response?.status} ${error.message}`
        : `Error fetching employees by role: ${error instanceof Error ? error.message : 'Unknown error'}`;
      
      return {
        success: false,
        data: [],
        message: errorMessage
      };
    }
  },
  
  getByManagerId: async (managerId: number): Promise<Employee[]> => {
    try {
      console.log(`Employee API: Fetching employees for manager ID ${managerId} from`, `${API_BASE_URL}/api/employee/GetEmployeesByManager/${managerId}`);
      const response = await apiClient.get(`/api/employee/GetEmployeesByManager/${managerId}`);

      console.log(`Employee API: Successfully fetched ${response.data.length} employees for manager ID ${managerId}`);
      return response.data;
    } catch (error) {
      console.error(`Employee API: Error fetching employees for manager ID ${managerId}:`, error);
      return []; // Return empty array on error for graceful degradation
    }
  },

  // Update employee status
  updateStatus: async (id: number, status: string): Promise<{success: boolean; message?: string}> => {
    try {
      console.log(`Employee API: Updating status for employee ID ${id} to "${status}"`);
      const response = await apiClient.patch(`/api/employee/${id}/status`, { Status: status });

      console.log(`Employee API: Successfully updated status for employee ID ${id}`);
      return {
        success: true,
        message: "Status updated successfully"
      };
    } catch (error) {
      console.error(`Employee API: Error updating status for employee ID ${id}:`, error);
      
      // Return a formatted error message for better user experience
      return {
        success: false,
        message: "Failed to update employee status. Please try again."
      };
    }
  },

  // Update employee reporting
  async updateEmployeeReporting(id: number, reportingToId: number | null): Promise<{ success: boolean; message?: string }> {
    try {
      const response = await apiClient.put(`/api/employee/${id}/reporting`, { reportingToId });
      return { success: true };
    } catch (error) {
      console.error('Error updating employee reporting:', error);
      return { success: false, message: error instanceof Error ? error.message : 'Unknown error' };
    }
  }
};

// Export the getEmployeeById function for backward compatibility
export const getEmployeeById = employeeApi.getById;

// Export the getEmployeesByRole function
export const getEmployeesByRole = employeeApi.getByRoleId;