import apiClient from './api/client'

export interface LoginRequest {
  email: string
  password: string
}

export interface LoginResponse {
  accessToken: string
  refreshToken: string
  user: {
    id: string
    email: string
    firstName: string
    lastName: string
    role: string
  }
}

export interface RefreshTokenResponse {
  accessToken: string
}

class AuthService {
  /**
   * Login user with email and password
   */
  async login(credentials: LoginRequest): Promise<LoginResponse> {
    const response = await apiClient.post<LoginResponse>('/auth/login', credentials)
    
    // Store tokens
    if (response.data.accessToken) {
      localStorage.setItem('access_token', response.data.accessToken)
    }
    if (response.data.refreshToken) {
      localStorage.setItem('refresh_token', response.data.refreshToken)
    }
    if (response.data.user) {
      localStorage.setItem('user', JSON.stringify(response.data.user))
    }
    
    return response.data
  }

  /**
   * Logout user
   */
  async logout(): Promise<void> {
    try {
      await apiClient.post('/auth/logout')
    } finally {
      // Clear local storage even if API call fails
      localStorage.removeItem('access_token')
      localStorage.removeItem('refresh_token')
      localStorage.removeItem('user')
    }
  }

  /**
   * Refresh access token
   */
  async refreshToken(): Promise<RefreshTokenResponse> {
    const refreshToken = localStorage.getItem('refresh_token')
    const response = await apiClient.post<RefreshTokenResponse>('/auth/refresh', {
      refreshToken,
    })
    
    if (response.data.accessToken) {
      localStorage.setItem('access_token', response.data.accessToken)
    }
    
    return response.data
  }

  /**
   * Get current user from localStorage
   */
  getCurrentUser() {
    const userStr = localStorage.getItem('user')
    return userStr ? JSON.parse(userStr) : null
  }

  /**
   * Check if user is authenticated
   */
  isAuthenticated(): boolean {
    return !!localStorage.getItem('access_token')
  }

  /**
   * Check if user is admin
   */
  isAdmin(): boolean {
    const user = this.getCurrentUser()
    return user?.role === 'ADMIN'
  }
}

export const authService = new AuthService()