import type { UserInfo, LoginForm, RegisterForm, AuthResponse } from '~/types/auth'

export const useAuth = () => {
  const config = useRuntimeConfig()
  const apiBase = config.public.apiBase

  const user = useState<UserInfo | null>('user', () => null)
  const isAuthenticated = computed(() => !!user.value)
  const loading = ref(false)

  const login = async (credentials: LoginForm) => {
    loading.value = true
    try {
      const response = await $fetch<AuthResponse>(`${apiBase}/auth/login`, {
        method: 'POST',
        body: credentials
      })

      user.value = response.user
      localStorage.setItem('auth_token', response.token)

      return response
    } catch (error) {
      throw error
    } finally {
      loading.value = false
    }
  }

  const register = async (userData: RegisterForm) => {
    loading.value = true
    try {
      const { passwordConfirm, ...registerData } = userData

      const response = await $fetch<AuthResponse>(`${apiBase}/auth/register`, {
        method: 'POST',
        body: registerData
      })

      user.value = response.user
      localStorage.setItem('auth_token', response.token)

      return response
    } catch (error) {
      throw error
    } finally {
      loading.value = false
    }
  }

  const logout = async () => {
    const token = localStorage.getItem('auth_token')
    try {
      await $fetch(`${apiBase}/auth/logout`, {
        method: 'POST',
        headers: { Authorization: `Bearer ${token}` }
      })
    } catch (error) {
      console.error('Logout error:', error)
    } finally {
      user.value = null
      localStorage.removeItem('auth_token')
      await navigateTo('/auth/login')
    }
  }

  const checkAuth = async () => {
    const token = localStorage.getItem('auth_token')
    if (!token) return

    try {
      const response = await $fetch<{ user: UserInfo }>(`${apiBase}/auth/me`, {
        headers: { Authorization: `Bearer ${token}` }
      })
      user.value = response.user
    } catch (error) {
      console.error('Auth check failed:', error)
      localStorage.removeItem('auth_token')
    }
  }

  return {
    user: readonly(user),
    isAuthenticated,
    loading: readonly(loading),
    login,
    register,
    logout,
    checkAuth
  }
}