<template>
  <div class="login">
    <el-form ref="loginRef" :model="loginForm" :rules="loginRules" class="login-form">
      <h3 class="title">平安水电后台管理系统</h3>

      <!-- CAS登录模式 -->
      <div v-if="settings.casEnable" class="cas-login-container">
        <div class="cas-login-info">
          <el-icon class="info-icon">
            <InfoFilled />
          </el-icon>
          <p>请使用学校统一身份认证系统登录</p>
        </div>
        <el-button :loading="loading" size="large" type="primary" style="width:100%; margin-top: 20px;"
          @click="handleCasLogin">
          <span v-if="!loading">学校统一登录</span>
          <span v-else>跳转中...</span>
        </el-button>
      </div>

      <!-- 传统登录模式 -->
      <div v-else>
        <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>
      </div>
    </el-form>
    <!--  底部  -->
    <div class="el-login-footer">
      <span></span>
    </div>
  </div>
</template>

<script setup>
import { getCodeImg } from "@/api/login";
import settings from "@/settings";
import useUserStore from '@/store/modules/user';
import { decrypt, encrypt } from "@/utils/jsencrypt";
import { InfoFilled } from '@element-plus/icons-vue';
import Cookies from "js-cookie";
import { onMounted } from 'vue';

const userStore = useUserStore()
const route = useRoute();
const router = useRouter();
const { proxy } = getCurrentInstance();

const loginForm = ref({
  // username: "admin",
  // password: "admin123",
  username: null,
  password: null,
  rememberMe: false,
  code: "",
  uuid: ""
});

const loginRules = {
  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("");
const loading = ref(false);
// 验证码开关
const captchaEnabled = ref(true);
// 注册开关
const register = ref(false);
const redirect = ref(undefined);



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

function handleLogin() {
  proxy.$refs.loginRef.validate(valid => {
    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
      if (loginForm.value.rememberMe) {
        Cookies.set("username", loginForm.value.username, { expires: 30 });
        Cookies.set("password", encrypt(loginForm.value.password), { expires: 30 });
        Cookies.set("rememberMe", loginForm.value.rememberMe, { expires: 30 });
      } else {
        // 否则移除
        Cookies.remove("username");
        Cookies.remove("password");
        Cookies.remove("rememberMe");
      }
      // 调用action的登录方法
      userStore.login(loginForm.value).then(() => {
        const query = route.query;
        const otherQueryParams = Object.keys(query).reduce((acc, cur) => {
          if (cur !== "redirect") {
            acc[cur] = query[cur];
          }
          return acc;
        }, {});
        router.push({ path: redirect.value || "/", query: otherQueryParams });
      }).catch(() => {
        loading.value = false;
        // 重新获取验证码
        if (captchaEnabled.value) {
          getCode();
        }
      });
    }
  });
}

function getCode() {
  getCodeImg().then(res => {
    captchaEnabled.value = res.captchaEnabled === undefined ? true : res.captchaEnabled;
    if (captchaEnabled.value) {
      codeUrl.value = "data:image/gif;base64," + res.img;
      loginForm.value.uuid = res.uuid;
    }
  });
}

function getCookie() {
  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)
  };
}

// CAS登录处理函数
function handleCasLogin() {
  loading.value = true;
  // 构建CAS登录URL(带 base 前缀以兼容不同部署路径)
  // 使用统一的CAS回调地址,让后端处理设备检测和分发
  const casServerUrl = settings.casServerUrl || 'https://cas.example.edu';
  const base = import.meta.env?.BASE_URL || '/';
  const serviceUrl = encodeURIComponent(window.location.origin + base + 'cas-callback');
  const casLoginUrl = `${casServerUrl}/login?service=${serviceUrl}`;

  // 跳转到CAS登录页面
  window.location.href = casLoginUrl;
}

// 页面加载时检查CAS配置,如果启用则自动跳转
onMounted(() => {
  const path = (window.location && window.location.pathname) || '';
  if (settings.casEnable && path.startsWith('/cas/')) {
    handleCasLogin();
  } else {
    getCode();
    getCookie();
  }
});

// 非 CAS 页面或非 CAS 模式下初始化验证码与 cookie
if (!(settings.casEnable && (typeof window !== 'undefined' && window.location && window.location.pathname.startsWith('/cas/')))) {
  getCode();
  getCookie();
}
</script>

<style lang='scss' scoped>
.login {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100%;
  background-image: url("../assets/images/login-background.jpg");
  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;

  .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;
}

// CAS登录相关样式
.cas-login-container {
  text-align: center;
  padding: 20px 0;

  .cas-login-info {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    padding: 15px;
    background-color: #f0f9ff;
    border: 1px solid #bfdbfe;
    border-radius: 6px;

    .info-icon {
      color: #3b82f6;
      margin-right: 8px;
      font-size: 16px;
    }

    p {
      margin: 0;
      color: #1e40af;
      font-size: 14px;
    }
  }
}
</style>
