<template>
  <div class="login-container">
    <el-form ref="loginForm" :model="loginForm" :rules="loginRules" class="login-form" auto-complete="on" label-position="left">

      <div class="title-container">
        <h3 class="title">TEKSystems Question Bank Admin Portal</h3>
      </div>

      <el-form-item prop="userName">
        <span class="svg-container">
          <svg-icon icon-class="user" />
        </span>
        <el-input
          ref="userName"
          v-model="loginForm.userName"
          placeholder="Username"
          name="userName"
          type="text"
          tabindex="1"
          auto-complete="on"
        />
      </el-form-item>

      <el-tooltip v-model="capsTooltip" content="Caps lock is On" placement="right" manual>
        <el-form-item prop="password">
          <span class="svg-container">
            <svg-icon icon-class="password" />
          </span>
          <el-input
            :key="passwordType"
            ref="password"
            v-model="loginForm.password"
            :type="passwordType"
            placeholder="Password"
            name="password"
            tabindex="2"
            auto-complete="on"
            @keyup.native="checkCapslock"
            @blur="capsTooltip = false"
            @keyup.enter.native="handleLogin"
          />
          <span class="show-pwd" @click="showPwd">
            <svg-icon :icon-class="passwordType === 'password' ? 'eye' : 'eye-open'" />
          </span>
        </el-form-item>
      </el-tooltip>

      <el-checkbox v-model="loginForm.remember" style="margin-bottom: 20px;margin-left: 5px;">Remember me</el-checkbox>

      <el-button :loading="loading" type="primary" style="width:100%;margin-bottom:30px;" @click.native.prevent="handleLogin">Login</el-button>

    </el-form>

    <div class="account-foot-copyright">
      <span>Copyright © 2020 TEKSystems</span>
    </div>
  </div>
</template>

<script>
import { mapMutations } from 'vuex'
import loginApi from '@/api/login'

export default {
  name: 'Login',
  data () {
    const validateUsername = (rule, value, callback) => {
      if (value.length < 5) {
        callback(new Error('The username can not be less than 5 characters.'))
      } else {
        callback()
      }
    }
    const validatePassword = (rule, value, callback) => {
      if (value.length < 5) {
        callback(new Error('The password must be no less than 5 characters.'))
      } else {
        callback()
      }
    }
    return {
      loginForm: {
        userName: '',
        password: '',
        remember: false
      },
      loginRules: {
        userName: [{ required: true, trigger: 'blur', validator: validateUsername }],
        password: [{ required: true, trigger: 'blur', validator: validatePassword }]
      },
      passwordType: 'password',
      capsTooltip: false,
      loading: false,
      showDialog: false
    }
  },
  created () {
    // window.addEventListener('storage', this.afterQRScan)
  },
  mounted () {
    if (this.loginForm.userName === '') {
      this.$refs.userName.focus()
    } else if (this.loginForm.password === '') {
      this.$refs.password.focus()
    }
  },
  destroyed () {
    // window.removeEventListener('storage', this.afterQRScan)
  },
  methods: {
    checkCapslock ({ shiftKey, key } = {}) {
      if (key && key.length === 1) {
        // eslint-disable-next-line no-mixed-operators
        if (shiftKey && (key >= 'a' && key <= 'z') || !shiftKey && (key >= 'A' && key <= 'Z')) {
          this.capsTooltip = true
        } else {
          this.capsTooltip = false
        }
      }
      if (key === 'CapsLock' && this.capsTooltip === true) {
        this.capsTooltip = false
      }
    },
    showPwd () {
      if (this.passwordType === 'password') {
        this.passwordType = ''
      } else {
        this.passwordType = 'password'
      }
      this.$nextTick(() => {
        this.$refs.password.focus()
      })
    },
    handleLogin () {
      let _this = this
      this.$refs.loginForm.validate(valid => {
        if (valid) {
          this.loading = true
          loginApi.login(this.loginForm).then(function (result) {
            if (result && result.code === 1) {
              _this.setUserName(_this.loginForm.userName)
              _this.$router.push({ path: '/' })
            } else {
              _this.loading = false
              _this.$message({
                message: result.message,
                type: 'error'
              })
            }
          }).catch(function (reason) {
            _this.loading = false
          })
        } else {
          return false
        }
      })
    },
    ...mapMutations('user', ['setUserName'])
  }
}
</script>

<style lang="scss">
/* 修复input 背景不协调 和光标变色 */
/* Detail see https://github.com/PanJiaChen/vue-element-admin/pull/927 */

$bg:#283443;
$light_gray:#fff;
$cursor: #fff;

@supports (-webkit-mask: none) and (not (cater-color: $cursor)) {
  .login-container .el-input input {
    color: $cursor;
  }
}

/* reset element-ui css */
.login-container {
  .el-input {
    display: inline-block;
    height: 47px;
    width: 85%;

    input {
      background: transparent;
      border: 0px;
      -webkit-appearance: none;
      border-radius: 0px;
      padding: 12px 5px 12px 15px;
      color: $light_gray;
      height: 47px;
      caret-color: $cursor;

      &:-webkit-autofill {
        box-shadow: 0 0 0px 1000px $bg inset !important;
        -webkit-text-fill-color: $cursor !important;
      }
    }
  }

  .el-form-item {
    border: 1px solid rgba(255, 255, 255, 0.1);
    background: rgba(0, 0, 0, 0.1);
    border-radius: 5px;
    color: #454545;
  }
}
</style>

<style lang="scss" scoped>
$bg:#2d3a4b;
$dark_gray:#889aa4;
$light_gray:#eee;

.login-container {
  min-height: 100%;
  width: 100%;
  background-color: $bg;
  overflow: hidden;

  .login-form {
    position: relative;
    width: 520px;
    max-width: 100%;
    padding:30px 50px 10px 50px;
    margin:120px auto auto auto;
    overflow: hidden;
    background: rgba(252, 254, 255, 0.11)
  }

  .tips {
    font-size: 14px;
    color: #fff;
    margin-bottom: 10px;

    span {
      &:first-of-type {
        margin-right: 16px;
      }
    }
  }

  .svg-container {
    padding: 6px 5px 6px 15px;
    color: $dark_gray;
    vertical-align: middle;
    width: 30px;
    display: inline-block;
  }

  .title-container {
    position: relative;

    .title {
      font-size: 26px;
      color: $light_gray;
      margin: 0px auto 40px auto;
      text-align: center;
      font-weight: bold;
    }
  }

  .show-pwd {
    position: absolute;
    right: 10px;
    top: 7px;
    font-size: 16px;
    color: $dark_gray;
    cursor: pointer;
    user-select: none;
  }

  .thirdparty-button {
    position: absolute;
    right: 0;
    bottom: 6px;
  }

  @media only screen and (max-width: 470px) {
    .thirdparty-button {
      display: none;
    }
  }
}
</style>
