<template>
  <div class="login">
    <el-form ref="loginForm" :model="loginForm" :rules="loginRules" class="login-form">
      <h3 class="title" style="color:#6077ef;">用户登录</h3>
      <el-form-item prop="username">
        <el-input v-model="loginForm.username" type="text" auto-complete="off" placeholder="账号">
          <svg-icon slot="prefix" icon-class="user" class="el-input__icon input-icon" />
        </el-input>
      </el-form-item>
      <el-form-item prop="password">
        <el-input
          v-model="loginForm.password"
          type="password"
          auto-complete="off"
          placeholder="密码"
          @keyup.enter.native="handleLogin"
        >
          <svg-icon slot="prefix" icon-class="password" class="el-input__icon input-icon" />
        </el-input>
      </el-form-item>
      <el-form-item prop="code" v-if="captchaOnOff">
        <el-input
          v-model="loginForm.code"
          auto-complete="off"
          placeholder="验证码"
          style="width: 63%"
          @keyup.enter.native="handleLogin"
        >
          <svg-icon slot="prefix" icon-class="validCode" class="el-input__icon input-icon" />
        </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="medium"
          type="primary"
          style="width:100%;"
          @click.native.prevent="handleLogin"
        >
          <span v-if="!loading">登 录</span>
          <span v-else>登 录 中...</span>
        </el-button>
      </el-form-item>
      <el-form-item style="width:100%;">
        <el-button
          size="medium"
          type="success"
          style="width:100%;"
          @click.native.prevent="showWechatLogin"
        >
          微信扫码登录
        </el-button>
      </el-form-item>
    </el-form>
    <!--  底部  -->
    <div class="el-login-footer">
      <span>Copyright © 2022  All Rights Reserved.</span>
    </div>

    <!-- 微信登录对话框 -->
    <el-dialog
      title="微信扫码登录"
      :visible.sync="wechatLoginVisible"
      width="300px"
      :before-close="handleWechatLoginClose">
      <div style="text-align: center;">
        <img :src="wechatQrCode" alt="微信二维码" style="width: 200px; height: 200px;" v-if="wechatQrCode">
        <div v-else>二维码加载中...</div>
        <p style="margin-top: 10px;">请使用微信扫描二维码登录</p>
      </div>
      <span slot="footer" class="dialog-footer">
        <el-button @click="handleWechatLoginClose">取 消</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
import { getCodeImg } from "@/api/login";
import { generateWechatQrCode, checkWechatLoginStatus, wechatLogin } from "@/api/wechat";
import Cookies from "js-cookie";
import { encrypt, decrypt } from '@/utils/jsencrypt'
// import { encode, decode } from '@/utils/base64'

export default {
  name: "Login",
  data() {
    return {
      codeUrl: "",
      cookiePassword: "",
      // 登录表单
      loginForm: {
        username: "",
        password: "",
        rememberMe: false,
        code: "",
        uuid: ""
      },
      // 微信登录相关
      wechatLoginVisible: false,
      wechatQrCode: "",
      wechatLoginId: "",
      wechatCheckTimer: null,
      wechatLoginForm: {
        username: null,
        password: null,
        rememberMe: false,
        code: "",
        uuid: ""
      },
      loginRules: {
        username: [
          { required: true, trigger: "blur", message: "用户名不能为空" }
        ],
        password: [
          { required: true, trigger: "blur", message: "密码不能为空" }
        ],
        code: [{ required: true, trigger: "change", message: "验证码不能为空" }]
      },
      loading: false,
      captchaOnOff: true,
      redirect: undefined
    };
  },
  watch: {
    $route: {
      handler: function(route) {
        this.redirect = route.query && route.query.redirect;
      },
      immediate: true
    }
  },
  created() {
    this.getCode();
    this.getCookie();
  },
  methods: {
    getCode() {
      getCodeImg().then(res => {
        this.captchaOnOff = res.captchaOnOff === undefined ? true : res.captchaOnOff;
        if (this.captchaOnOff) {
          this.codeUrl = "data:image/gif;base64," + res.img;
          this.loginForm.uuid = res.uuid;
        }
      });
    },
    getCookie() {
      const username = Cookies.get("username");
      const password = Cookies.get("password");
      const rememberMe = Cookies.get('rememberMe')
      this.loginForm = {
        username: username === undefined ? this.loginForm.username : username,
        password: password === undefined ? this.loginForm.password : decrypt(password),
        rememberMe: rememberMe === undefined ? false : Boolean(rememberMe)
      };
    },
    handleLogin() {
      this.$refs.loginForm.validate(valid => {
        if (valid) {
          if (this.loginForm.username.trim() !== this.loginForm.username) {
            this.$message.error('输入用户名前、后端不能有空格')
            return
          }
          this.loading = true;
          if (this.loginForm.rememberMe) {
            Cookies.set("username", this.loginForm.username, { expires: 30 });
            Cookies.set("password", encrypt(this.loginForm.password), { expires: 30 });
            Cookies.set('rememberMe', this.loginForm.rememberMe, { expires: 30 });
          } else {
            Cookies.remove("username");
            Cookies.remove("password");
            Cookies.remove('rememberMe');
          }
          this.$store.dispatch("Login", this.loginForm).then(() => {
            this.$router.push({ path: this.redirect || "/" }).catch(()=>{});
          }).catch(() => {
            this.loading = false;
            if (this.captchaOnOff) {
              this.getCode();
            }
          });
        }
      });
    },

    // 显示微信登录对话框
    showWechatLogin() {
      this.wechatLoginVisible = true;
      this.generateWechatQrCode();
    },

    // 生成微信登录二维码
    generateWechatQrCode() {
      generateWechatQrCode().then(res => {
        if (res.code === 200) {
          this.wechatQrCode = res.data.qrCodeImage;
          this.wechatLoginId = res.data.loginId;
          // 开始轮询检查登录状态
          this.startCheckWechatLoginStatus();
        } else {
          this.$message.error("生成二维码失败: " + res.msg);
        }
      }).catch(error => {
        this.$message.error("生成二维码失败: " + error.message);
      });
    },

    // 开始检查微信登录状态
    startCheckWechatLoginStatus() {
      // 清除之前的定时器
      if (this.wechatCheckTimer) {
        clearInterval(this.wechatCheckTimer);
      }
      // 每2秒检查一次登录状态
      this.wechatCheckTimer = setInterval(() => {
        this.checkWechatLoginStatus();
      }, 2000);
    },

    // 检查微信登录状态
    checkWechatLoginStatus() {
      if (!this.wechatLoginId) return;
      
      checkWechatLoginStatus(this.wechatLoginId).then(res => {
        if (res.code === 200) {
          const status = res.data.status;
          if (status === "2") { // 登录成功
            this.handleWechatLoginSuccess();
          } else if (status === "3") { // 已过期
            this.handleWechatLoginExpired();
          }
        }
      }).catch(error => {
        console.error("检查登录状态失败:", error);
      });
    },

    // 微信登录成功处理
    handleWechatLoginSuccess() {
      // 清除定时器
      if (this.wechatCheckTimer) {
        clearInterval(this.wechatCheckTimer);
        this.wechatCheckTimer = null;
      }
      
      // 执行微信登录
      wechatLogin(this.wechatLoginId).then(res => {
        if (res.code === 200) {
          // 微信登录成功，获取用户信息并跳转
          this.$store.dispatch("GetInfo").then(() => {
            this.$router.push({ path: this.redirect || "/" }).catch(() => {});
          });
        } else {
          this.$message.error("微信登录失败: " + res.msg);
        }
      }).catch(error => {
        this.$message.error("微信登录失败: " + error.message);
      });
    },

    // 微信登录过期处理
    handleWechatLoginExpired() {
      // 清除定时器
      if (this.wechatCheckTimer) {
        clearInterval(this.wechatCheckTimer);
        this.wechatCheckTimer = null;
      }
      
      this.$message.warning("二维码已过期，请重新获取");
      this.wechatQrCode = "";
      this.wechatLoginId = "";
    },

    // 关闭微信登录对话框
    handleWechatLoginClose() {
      this.wechatLoginVisible = false;
      // 清除定时器
      if (this.wechatCheckTimer) {
        clearInterval(this.wechatCheckTimer);
        this.wechatCheckTimer = null;
      }
      this.wechatQrCode = "";
      this.wechatLoginId = "";
    }
  }
};
</script>

<style rel="stylesheet/scss" lang="scss">
.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: 38px;
    input {
      height: 38px;
    }
  }
  .input-icon {
    height: 39px;
    width: 14px;
    margin-left: 2px;
  }
}
.login-tip {
  font-size: 13px;
  text-align: center;
  color: #bfbfbf;
}
.login-code {
  width: 33%;
  height: 38px;
  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: 38px;
}
</style>
