<template>
  <div class="login-container" :style="'background-image:url('+ background +');'">
    <el-form ref="loginForm" :model="loginForm" :rules="loginRules" class="login-form" auto-complete="on" label-position="left">
      <div class="title-container">
        <h3 class="title">系统登陆</h3>
      </div>
      <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-button :loading="loading" type="primary" style="width:100%;margin-bottom:30px;" @click.native.prevent="handleLogin">登录</el-button>
    </el-form>
  </div>
</template>

<script>
import { log } from '@/api/system/user'
import background from '@/assets/images/login-bg.jpg'

export default {
  name: 'Login',
  data() {
    const validateUsername = (rule, value, callback) => {
      if (value.length < 1) {
        return callback(new Error('请输入用户名'))
      } else {
        callback()
      }
    }
    const validatePassword = (rule, value, callback) => {
      if (value.length < 1) {
        return callback(new Error('请输入密码'))
      } else {
        callback()
      }
    }
    return {
      background: background,
      loginForm: {
        username: '',
        password: ''
      },
      loginRules: {
        username: [{ required: true, trigger: 'blur', validator: validateUsername }],
        password: [{ required: true, trigger: 'blur', validator: validatePassword }]
      },
      loading: false,
      redirect: undefined
    }
  },
  watch: {
    $route: {
      handler: function(route) {
        this.redirect = route.query && route.query.redirect
      },
      immediate: true
    }
  },
  methods: {
    handleLogin() {
      this.$refs.loginForm.validate(valid => {
        if (valid) {
          this.loading = true
          this.$store.dispatch('user/login', this.loginForm).then(() => {
            this.$router.push({ path: this.redirect || '/' })
            this.loading = false
          }).then(() => {
            log()
          }).catch(() => {
            this.loading = false
          })
        } else {
          return false
        }
      })
    }
  }
}
</script>

<style lang="scss" scoped>
.login-container {
  height: calc(100vh);
  width: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  background-repeat: no-repeat;
  background-size: cover;
  background-position: center center;
  transition: background-image 3s;
  .title-container {
    margin: 0 auto 30px auto;
    text-align: center;
    color: #d3d7f7;
  }
  .login-form {
    border-radius: 6px;
    background: rgba(94, 94, 187, .5);
    box-shadow: 0 0 25px rgba(223, 220, 239, .5);
    width: 385px;
    padding: 25px 25px 5px 25px;
    .el-input {
      height: 38px;
      input {
        height: 38px;
      }
    }
    .input-icon{
      height: 39px;
      width: 14px;
      margin-left: 2px;
    }
  }
}
</style>
