<!--
 * @Author: zyk 
 * @Date: 2020-07-13 11:04:24 
 * @Last Modified by:   zyk 
 * @Last Modified time: 2020-07-13 11:04:24 
 !-->
<template>
  <div class="login_container">
    <!-- 顶部logo -->
    <div class="login_title">
      <img src="@/assets/images/home-logo.png"
           alt="logo">
    </div>
    <div class="login_contant">
      <img src="@/assets/images/login.png"
           alt="image"
           class="login_img">
      <el-form ref="loginForm"
               :model="loginForm"
               :rules="loginRules"
               class="login_form"
               autocomplete="on"
               label-position="left"
               @keyup.enter.native="handleLogin">
        <div class="title_container">
          <h3 class="title">
            HELLO,
            <br>
            <p class="title_name">在线大屏</p>
          </h3>
        </div>
        <div class="form_fields">
          <!-- 黄色条条 -->
          <i :style="{ top: activeTop + '%' }" />
          <!-- 中间条条 -->
          <b />
          <div>
            <p>用户名</p>
            <el-form-item prop="username">
              <el-input ref="username"
                        v-model="loginForm.username"
                        placeholder="用户名"
                        name="username"
                        type="text"
                        tabindex="1"
                        autocomplete="on"
                        @focus="setTop('0')"
                        @change="getPsw" />
            </el-form-item>
          </div>
          <div>
            <p>密码</p>
            <input name="password"
                   type="password"
                   autocomplete="off"
                   class="take">
            <el-tooltip v-model="capsTooltip"
                        content="Caps lock is On"
                        placement="right"
                        manual>
              <el-form-item prop="password">
                <el-input :key="passwordType"
                          ref="password"
                          v-model="loginForm.password"
                          :type="passwordType"
                          placeholder="用户密码"
                          name="password"
                          tabindex="2"
                          autocomplete="on"
                          @blur="capsTooltip = false"
                          @focus="setTop('50')"
                          @keyup.native="checkCapslock" />
                <span class="show_pwd"
                      @click="showPwd">
                  <i class="el-icon-view" />
                </span>
              </el-form-item>
            </el-tooltip>
          </div>
        </div>
        <div class="control">
          <div class="remember">
            <input v-model="rememberPsw"
                   type="checkbox">
            <p>记住密码</p>
          </div>
        </div>
        <el-button :loading="loading"
                   type="primary"
                   class="login_btn"
                   @click.native.prevent="handleLogin">登录</el-button>
      </el-form>
    </div>
    <!--  验证码  -->
    <Verify v-if="needCaptcha"
            ref="verify"
            :captcha-type="'blockPuzzle'"
            :img-size="{ width: '400px', height: '200px' }"
            @success="verifylogin" />
  </div>
</template>

<script> 
import Verify from '@/components/verifition/Verify'
import cookies from 'js-cookie'
import { Decrypt, Encrypt } from '@/utils/index'
import { login } from '@/api/login'
import { transPsw } from '@/utils/encrypted'
import { setItem, getItem } from '@/utils/storage';
export default {
  name: 'Login',
  components: {
    Verify,
  },
  data () {
    return {
      activeTop: '-50%', // 色条滑块控制
      rememberPsw: false, // 记住密码选择框
      loginForm: {
        username: 'admin',
        password: '123456',
        verifyCode: '',
      }, // 登录表单
      loginRules: {
        username: [{ required: true, message: '用户名必填', trigger: 'blur' }],
        password: [{ required: true, message: '用户密码必填', trigger: 'blur' }],
      }, // 登录表单验证
      passwordType: 'password', // 用来控制查看密码操作时的输入框类型
      capsTooltip: false, // 键盘大写是否打开
      loading: false, // 登录loding
      redirect: undefined, // 记录重定向地址
      otherQuery: {}, // 记录重定向地址中的参数
      needCaptcha: false,
    }
  },
  watch: {
    $route: {
      // 监听路由获取上个路由（from）的地址和参数
      handler: function (route) {
        const query = route.query
        if (query) {
          this.redirect = query.redirect
          this.otherQuery = this.getOtherQuery(query)
        }
      },
      immediate: true,
    },
  },
  mounted () {
    // 获取焦点
    if (this.loginForm.username === '') {
      this.$refs.username.focus()
    } else if (this.loginForm.password === '') {
      this.$refs.password.focus()
    }
  },
  methods: {
    // 获取存储的密码并解密
    getPsw () {
      const cookVal = cookies.get(`u_${this.loginForm.username}`)
      this.loginForm.password = cookVal && Decrypt(cookVal)
    },
    // 滑动条块的top控制
    setTop (val) {
      this.activeTop = val
    },
    // 检测大写锁定键是否开启
    checkCapslock (e) {
      const { key } = e
      this.capsTooltip = key && key.length === 1 && key >= 'A' && key <= 'Z'
    },
    // 查看密码
    showPwd () {
      if (this.passwordType === 'password') {
        this.passwordType = ''
      } else {
        this.passwordType = 'password'
      }
      this.$nextTick(() => {
        this.$refs.password.focus()
      })
    },
    // 滑动验证码
    useVerify () {
      this.$refs.loginForm.validate((valid) => {
        if (valid) {
          this.$refs.verify.show()
        } else {
          return false
        }
      })
    },
    // 验证成功的回调
    verifylogin (params) {
      this.loginForm.verifyCode = params.captchaVerification
      if (this.loginForm.verifyCode) {
        this.loginApi()
      }
    },
    // 登录操作
    handleLogin () {
      this.$refs.loginForm.validate((valid) => {
        if (valid) {
          this.loading = true
          // 登录失败次数过多需要展示滑动验证码
          if (this.needCaptcha) {
            this.useVerify()
            return
          }
          this.loginApi()
        } else {
          return false
        }
      })
    },
    async loginApi () {
      let obj = {
        username: this.loginForm.username,
        password: transPsw(this.loginForm.password),
        verifyCode: ""
      }
      const { code, data } = await login(obj)
      if (code != '200') return
      setItem("token", data.token)
      this.loading = false
      // 选中记住密码时 把密码存到cookie里,时效15天
      this.rememberPsw && cookies.set(`u_${this.loginForm.username}`, Encrypt(this.loginForm.password), { expires: 15 })
      if (data && data.captcha) {
        this.needCaptcha = true
      } else {
        this.needCaptcha = false
        this.$router.push({ path: this.redirect || '/index', query: this.otherQuery })
      }
    },
    getOtherQuery (query) {
      return Object.keys(query).reduce((acc, cur) => {
        if (cur !== 'redirect') {
          acc[cur] = query[cur]
        }
        return acc
      }, {})
    },
  },
}
</script>

<style lang="scss">
.login_container .el-input input {
  color: #000;
  background: #fff;
}

/* reset element-ui css */
.login_container {
  .el-input {
    display: inline-block;
    width: 100%;
    input {
      -webkit-appearance: none;
      caret-color: rgba($color: #000000, $alpha: 0.3);
      border: 1px solid #fff;
      &:-webkit-autofill {
        box-shadow: 0 0 0px 1000px #eee inset !important;
        -webkit-text-fill-color: #666 !important;
      }
    }
  }

  .el-form-item {
    border-radius: 5px;
    color: #454545;
  }
}
.verifybox {
  position: absolute;
  left: auto;
  right: 30%;
  transform: translate(50%, -50%);
}
</style>

<style lang="scss" scoped>
.take {
  position: absolute;
  top: 0;
  left: 0;
  z-index: -1;
}
.login_container {
  height: 100%;
  width: 100%;
  overflow: hidden;
  .login_title {
    width: 100%;
    height: 60px;
    padding: 10px 60px;
    display: flex;
    align-items: center;
    img {
      width: 10%;
      display: block;
    }
  }
  .login_contant {
    position: relative;
    width: 100%;
    height: calc(100% - 60px);
    // height: 100%;
    .login_img {
      display: block;
      width: 100%;
      height: 100%;
    }
    .login_form {
      position: absolute;
      top: 50%;
      right: 30%;
      transform: translate(50%, -50%);
      min-width: 400px;
      width: 22%;
      height: 460px;
      background-color: #ffffff;
      border-radius: 11px;
      padding: 30px;
      overflow: hidden;
      .title_container {
        position: relative;
        .title {
          font-size: 24px;
          color: #1a1a1a;
          .title_name {
            margin: 0;
            font-size: 18px;
          }
        }
        .set_language {
          color: #fff;
          position: absolute;
          top: 3px;
          font-size: 18px;
          right: 0px;
          cursor: pointer;
        }
      }
      .form_fields {
        position: relative;
        width: 100%;
        overflow: hidden;
        padding: 5px 16px;
        background: #ffffff;
        border: 1px solid #e0e0e0;
        box-shadow: 0 0 14px 4px rgba(230, 229, 229, 0.5);
        border-radius: 4px 10px 10px 4px;
        i {
          position: absolute;
          top: -50%;
          left: 0;
          width: 4px;
          height: 50%;
          transition: top 0.2s;
          background: #f5ab1b;
          border-radius: 14px;
        }
        b {
          position: absolute;
          top: 50%;
          left: 0;
          width: 100%;
          height: 1px;
          background: #e0e0e0;
          border-radius: 2px;
          margin-top: -0.5px;
        }
        p {
          margin: 0;
          padding: 0;
          line-height: 32px;
          height: 32px;
          font-size: 12px;
          color: #666;
        }
        .show_pwd {
          position: absolute;
          right: 10px;
          top: 0;
          font-size: 16px;
          color: #889aa4;
          cursor: pointer;
          user-select: none;
        }
      }
      .control {
        width: 100%;
        height: 70px;
        display: flex;
        align-items: center;
        justify-content: space-between;
        font-size: 14px;
        color: #919191;
        .remember {
          width: 36%;
          display: flex;
          align-items: center;
          p {
            padding-left: 8px;
          }
          // justify-content: space-between;
          & > input {
            position: relative;
            width: 14px;
            height: 14px;
          }
          & > input:checked::before {
            content: "\2713";
            background-color: #f5ab1b;
            position: absolute;
            top: 0;
            left: 0px;
            padding-left: 1.5px;
            width: 100%;
            height: 100%;
            border: 1px solid #f5ab1b;
            border-radius: 2px;
            font-size: 12px;
            color: white;
            font-weight: bold;
          }
        }
      }
      .login_btn {
        width: 130px;
        height: 40px;
        background: #f5ab1b;
        border: none;
        border-radius: 10px;
        font-size: 16px;
        color: #ffffff;
        text-align: center;
      }
    }
  }
}
</style>
