/**
 * 登录逻辑 Composable
 */

import { ref, reactive, computed, onMounted } from 'vue'
import { useRouter, useRoute } from 'vue-router'
import { useI18n } from 'vue-i18n'
import { ElMessage, ElNotification } from 'element-plus'
import type { FormInstance, FormRules } from 'element-plus'
import { useUserStore } from '@/store/modules/user'
import { HOME_PAGE } from '@/router/routesAlias'
import AppConfig from '@/config'
import { AuthService } from '@/api/modules'
import { ApiStatus } from '@/utils/http/status'
import { MOCK_ACCOUNTS, mockLogin, mockGetUserInfo, type MockAccount } from '@/mock/auth'
import { saveCredentials, getRememberedCredentials } from '@/utils/auth/rememberPassword'
import { usernameRules, passwordRules } from '@/utils/auth/loginValidation'
import { getRedirectPath } from '@/router/guards/permission'

// 开发模式：是否使用 Mock 数据
const USE_MOCK = false

/**
 * 登录表单数据
 */
interface LoginForm {
  account: string
  username: string
  password: string
  rememberPassword: boolean
}

export function useLogin() {
  const { t } = useI18n()
  const router = useRouter()
  const route = useRoute()
  const userStore = useUserStore()

  // 表单引用
  const formRef = ref<FormInstance>()

  // 加载状态
  const loading = ref(false)

  // 表单数据
  const formData = reactive<LoginForm>({
    account: '',
    username: '',
    password: '',
    rememberPassword: true
  })

  // 验证规则
  const rules = computed<FormRules>(() => ({
    username: usernameRules(t),
    password: passwordRules(t)
  }))

  // Mock 账号列表
  const mockAccounts = computed<MockAccount[]>(() => MOCK_ACCOUNTS)

  /**
   * 初始化表单
   */
  const initForm = () => {
    // 尝试加载记住的密码
    const remembered = getRememberedCredentials()
    if (remembered) {
      formData.username = remembered.username
      formData.password = remembered.password
      formData.rememberPassword = remembered.rememberPassword

      // 如果使用 Mock，尝试匹配 Mock 账号
      if (USE_MOCK) {
        const matchedAccount = MOCK_ACCOUNTS.find((acc) => acc.username === remembered.username)
        if (matchedAccount) {
          formData.account = matchedAccount.key
        }
      }
    } else {
      // 开发环境：使用真实 API 默认账号
      if (import.meta.env.MODE === 'development') {
        formData.username = 'admin'
        formData.password = 'Admin@123456'
        formData.rememberPassword = false
      }
      // 生产环境：不填充默认值
    }
  }

  /**
   * 设置 Mock 账号
   */
  const setupAccount = (key: string) => {
    const selectedAccount = MOCK_ACCOUNTS.find((account) => account.key === key)
    if (selectedAccount) {
      formData.account = key
      formData.username = selectedAccount.username
      formData.password = selectedAccount.password
    }
  }

  /**
   * 执行登录
   */
  const handleLogin = async () => {
    if (!formRef.value) return

    try {
      // 验证表单
      const valid = await formRef.value.validate()
      if (!valid) return

      loading.value = true

      // 判断使用 Mock 还是真实 API
      if (USE_MOCK) {
        await handleMockLogin()
      } else {
        await handleRealLogin()
      }
    } catch (error: any) {
      console.error('登录失败:', error)
    } finally {
      loading.value = false
    }
  }

  /**
   * Mock 登录（开发测试用）
   */
  const handleMockLogin = async () => {
    const loginResult = mockLogin(formData.username, formData.password)

    if (!loginResult) {
      console.log(t('login.error.invalidCredentials'))
      return
    }

    // 保存 Token
    userStore.setToken(loginResult.access_token, loginResult.refresh_token)

    // 获取用户信息
    const userInfo = mockGetUserInfo(loginResult.access_token)

    if (!userInfo) {
      console.log(t('login.error.getUserInfoFailed'))
      return
    }

    // 保存用户信息
    userStore.setUserInfo(userInfo)
    userStore.setLoginStatus(true)

    // 保存记住密码
    saveCredentials(formData.username, formData.password, formData.rememberPassword)

    // 显示登录成功提示
    showLoginSuccessNotice()

    // 跳转到重定向页面或首页
    const redirectPath = getRedirectPath(route)
    await router.push(redirectPath || HOME_PAGE)
  }

  /**
   * 真实 API 登录
   */
  const handleRealLogin = async () => {
    // 调用登录接口
    const response = await AuthService.login({
      username: formData.username,
      password: formData.password
    })

    // 检查响应状态
    if (response.code !== ApiStatus.success) {
      console.log(response.msg || t('login.error.invalidCredentials'))
      return
    }

    // 检查返回数据
    if (!response.data || !response.data.access_token) {
      console.log(t('login.error.loginFailed'))
      return
    }

    // 检查用户类型 - 禁止企业账号登录
    if (response.data.user && response.data.user.user_type === 4) {
      console.log('企业账号无法登录后台管理系统')
      return
    }

    // 保存 Token
    userStore.setToken(response.data.access_token, response.data.refresh_token)

    // 保存用户信息
    if (response.data.user) {
      userStore.setUserInfo(response.data.user)
      userStore.setLoginStatus(true)
    } else {
      console.log(t('login.error.getUserInfoFailed'))
      return
    }

    // 保存权限、菜单和按钮
    if (response.data.permissions) {
      userStore.setPermissions(response.data.permissions)
    }
    if (response.data.menus) {
      userStore.setMenus(response.data.menus)
    }
    if (response.data.buttons) {
      userStore.setButtons(response.data.buttons)
    }

    // 保存记住密码
    saveCredentials(formData.username, formData.password, formData.rememberPassword)

    // 显示登录成功提示
    showLoginSuccessNotice()

    // 等待数据持久化完成
    await new Promise((resolve) => setTimeout(resolve, 100))

    // 跳转到重定向页面或首页
    const redirectPath = getRedirectPath(route)
    await router.push(redirectPath || HOME_PAGE)
  }

  /**
   * 显示登录成功通知
   */
  const showLoginSuccessNotice = () => {
    setTimeout(() => {
      ElNotification({
        title: t('login.success.title'),
        type: 'success',
        duration: 2500,
        zIndex: 10000,
        message: `${t('login.success.message')}, ${AppConfig.systemInfo.name}!`
      })
    }, 150)
  }

  // 组件挂载时初始化
  onMounted(() => {
    initForm()
  })

  return {
    formRef,
    formData,
    rules,
    loading,
    mockAccounts,
    setupAccount,
    handleLogin
  }
}