<template>
  <div class="login">
    <el-form ref="loginRef" :model="loginForm" :rules="loginRules" class="login-form">
      <h3 class="title">{{ title }}</h3>
      <el-form-item prop="username">
        <el-input
            v-model="loginForm.username"
            type="text"
            size="large"
            auto-complete="off"
            placeholder="账号"
        >
          <template #prefix><svg-icon icon-class="user" class="el-input__icon input-icon" /></template>
        </el-input>
      </el-form-item>
      <el-form-item prop="password">
        <el-input
            v-model="loginForm.password"
            type="password"
            size="large"
            auto-complete="off"
            placeholder="密码"
            @keyup.enter="handleLogin"
        >
          <template #prefix><svg-icon icon-class="password" class="el-input__icon input-icon" /></template>
        </el-input>
      </el-form-item>
      <el-form-item prop="code" v-if="captchaEnabled">
        <el-input
            v-model="loginForm.code"
            size="large"
            auto-complete="off"
            placeholder="验证码"
            style="width: 63%"
            @keyup.enter="handleLogin"
        >
          <template #prefix><svg-icon icon-class="validCode" class="el-input__icon input-icon" /></template>
        </el-input>
        <div class="login-code">
          <img :src="codeUrl" @click="getCode" class="login-code-img"/>
        </div>
      </el-form-item>
      <el-checkbox v-model="loginForm.rememberMe" style="margin:0px 0px 25px 0px;">记住密码</el-checkbox>
      <el-form-item style="width:100%;">
        <el-button
            :loading="loading"
            size="large"
            type="primary"
            style="width:100%;"
            @click.prevent="handleLogin"
        >
          <span v-if="!loading">登 录</span>
          <span v-else>登 录 中...</span>
        </el-button>
        <div style="float: right;" v-if="register">
          <router-link class="link-type" :to="'/register'">立即注册</router-link>
        </div>
      </el-form-item>
    </el-form>
    <!--  底部  -->
    <div class="el-login-footer">
      <span>{{ footerContent }}</span>
    </div>
  </div>
</template>

<script setup lang="ts">
import { ref, watch } from 'vue'
import { useRoute, useRouter } from 'vue-router'
import { getCodeImg } from '@/api/login'
import Cookies from 'js-cookie'
import { encrypt, decrypt } from '@/utils/jsencrypt'
import useUserStore from '@/stores/user'
import defaultSettings from '@/settings'
import type { FormInstance, FormRules } from 'element-plus'

// 定义类型接口
interface LoginForm {
  username: string
  password: string
  rememberMe?: boolean
  code?: string
  uuid?: string
}

interface CaptchaResponse {
  captchaEnabled?: boolean
  img?: string
  uuid?: string
}

interface QueryParams {
  [key: string]: any
  redirect?: string
}

const title = import.meta.env.VITE_APP_TITLE
const footerContent = defaultSettings.footerContent
const userStore = useUserStore()
const route = useRoute()
const router = useRouter()
const loginRef = ref<FormInstance>()

const loginForm = ref<LoginForm>({
  username: "admin",
  password: "admin123",
  rememberMe: false,
  code: "",
  uuid: ""
})

const loginRules: FormRules<LoginForm> = {
  username: [{ required: true, trigger: "blur", message: "请输入您的账号" }],
  password: [{ required: true, trigger: "blur", message: "请输入您的密码" }],
  code: [{ required: true, trigger: "change", message: "请输入验证码" }]
}

const codeUrl = ref<string>("")
const loading = ref<boolean>(false)
// 验证码开关
const captchaEnabled = ref<boolean>(true)
// 注册开关
const register = ref<boolean>(false)
const redirect = ref<string | undefined>(undefined)

watch(route, (newRoute) => {
  redirect.value = newRoute.query && (newRoute.query.redirect as string)
}, { immediate: true })

function handleLogin(): void {
  loginRef.value?.validate((valid: boolean) => {
    if (valid) {
      loading.value = true
      // 勾选了需要记住密码设置在 cookie 中设置记住用户名和密码
      handleRememberMe()
      // 调用action的登录方法
      userStore.login(loginForm.value).then(() => {
        const query: QueryParams = route.query
        handleRedirect(query)
      }).catch(() => {
        loading.value = false
        // 重新获取验证码
        if (captchaEnabled.value) {
          getCode()
        }
      })
    }
  })
}
function handleRememberMe(): void {
  if (loginForm.value.rememberMe) {
    Cookies.set("username", loginForm.value.username, { expires: 30 })
    Cookies.set("password", encrypt(loginForm.value.password), {expires: 30})
    Cookies.set("rememberMe", String(loginForm.value.rememberMe), { expires: 30 })
  } else {
    Cookies.remove("username")
    Cookies.remove("password")
    Cookies.remove("rememberMe")
  }
}

function handleRedirect(query: QueryParams): void {
  if (query.redirect) {
    router.push(query.redirect);
  } else {
    router.push({
      path: redirect.value || "/",
      query: Object.keys(query).reduce((acc: Record<string, any>, cur: string) => {
        if (cur !== "redirect") acc[cur] = query[cur];
        return acc;
      }, {})
    });
  }
}
function getCode(): void {
  getCodeImg().then((data: CaptchaResponse) => {
    captchaEnabled.value = data.captchaEnabled === undefined ? true : data.captchaEnabled
    if (captchaEnabled.value && data.img && data.uuid) {
      codeUrl.value = "data:image/gif;base64," + data.img
      loginForm.value.uuid = data.uuid
    }
  })
}

function getCookie(): void {
  const username = Cookies.get("username")
  const password = Cookies.get("password")
  const rememberMe = Cookies.get("rememberMe")
  loginForm.value = {
    username: username === undefined ? loginForm.value.username : username,
    password: password === undefined ? loginForm.value.password : decrypt(password),
    rememberMe: rememberMe === undefined ? false : Boolean(rememberMe),
  }
}

getCode()
getCookie()
</script>

<style lang='scss' scoped>
.login {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100%;
  background-image: url("../assets/images/login.png");
  background-size: cover;
}
.title {
  margin: 0px auto 30px auto;
  text-align: center;
  color: #707070;
}

.login-form {
  border-radius: 6px;
  background: #ffffff;
  width: 400px;
  padding: 25px 25px 5px 25px;
  z-index: 1;
  .el-input {
    height: 40px;
    input {
      height: 40px;
    }
  }
  .input-icon {
    height: 39px;
    width: 14px;
    margin-left: 0px;
  }
}
.login-tip {
  font-size: 13px;
  text-align: center;
  color: #bfbfbf;
}
.login-code {
  width: 33%;
  height: 40px;
  float: right;
  img {
    cursor: pointer;
    vertical-align: middle;
  }
}
.el-login-footer {
  height: 40px;
  line-height: 40px;
  position: fixed;
  bottom: 0;
  width: 100%;
  text-align: center;
  color: #fff;
  font-family: Arial;
  font-size: 12px;
  letter-spacing: 1px;
}
.login-code-img {
  height: 40px;
  padding-left: 12px;
}
</style>
