<template>
  <div class="login-container">
    <el-form
      ref="loginForm"
      :model="loginForm"
      :rules="loginRules"
      class="login-form"
      autocomplete="on"
      label-position="left"
    >
      <div class="title-container">
        <h3 class="title">Login Form</h3>
      </div>

      <el-form-item prop="username">
        <span class="svg-container">
          <svg-icon name="user" />
        </span>
        <el-input
          ref="username"
          v-model="loginForm.username"
          name="username"
          type="text"
          autocomplete="on"
          placeholder="username"
        />
      </el-form-item>

      <el-form-item prop="password">
        <span class="svg-container">
          <svg-icon name="password" />
        </span>
        <el-input
          :key="passwordType"
          ref="password"
          v-model="loginForm.password"
          :type="passwordType"
          placeholder="password"
          name="password"
          autocomplete="on"
          @keyup.enter.native="handleLogin"
        />
        <span class="show-pwd" @click="showPwd">
          <svg-icon
            :name="passwordType === 'password' ? 'eye-off' : 'eye-on'"
          />
        </span>
      </el-form-item>

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

      <div style="position:relative">
        <div class="tips">
          <span>username: admin</span>
          <span>password: any</span>
        </div>
      </div>
    </el-form>
  </div>
</template>

<script lang="ts">
import { Component, Vue, Watch } from "vue-property-decorator";
import { Route } from "vue-router";
import { Dictionary } from "vuex";
import { Form as ElForm, Input } from "element-ui";
import { UserModule } from "@/store/modules/user";
import { isValidUsername } from "@/utils/validate";
@Component({
  name: "Login"
})
export default class extends Vue {
  private validateUsername = (rule: any, value: string, callback: Function) => {
    if (!isValidUsername(value)) {
      callback(new Error("Please enter the correct user name"));
    } else {
      callback();
    }
  };
  private validatePassword = (rule: any, value: string, callback: Function) => {
    if (value.length < 6) {
      callback(new Error("The password can not be less than 6 digits"));
    } else {
      callback();
    }
  };
  private loginForm = {
    username: "admin",
    password: "111111"
  };
  private loginRules = {
    username: [{ validator: this.validateUsername, trigger: "blur" }],
    password: [{ validator: this.validatePassword, trigger: "blur" }]
  };
  private passwordType = "password";
  private loading = false;
  private showDialog = false;
  private redirect?: string;
  private otherQuery: Dictionary<string> = {};
  @Watch("$route", { immediate: true })
  private onRouteChange(route: Route) {
    // TODO: remove the "as Dictionary<string>" hack after v4 release for vue-router
    // See https://github.com/vuejs/vue-router/pull/2050 for details
    const query = route.query as Dictionary<string>;
    if (query) {
      this.redirect = query.redirect;
      this.otherQuery = this.getOtherQuery(query);
    }
  }
  mounted() {
    if (this.loginForm.username === "") {
      (this.$refs.username as Input).focus();
    } else if (this.loginForm.password === "") {
      (this.$refs.password as Input).focus();
    }
  }
  private showPwd() {
    if (this.passwordType === "password") {
      this.passwordType = "";
    } else {
      this.passwordType = "password";
    }
    this.$nextTick(() => {
      (this.$refs.password as Input).focus();
    });
  }
  private handleLogin() {
    (this.$refs.loginForm as ElForm).validate(async (valid: boolean) => {
      if (valid) {
        this.loading = true;
        await UserModule.Login(this.loginForm);
        this.$router.push({
          path: this.redirect || "/",
          query: this.otherQuery
        });
        // Just to simulate the time of the request
        setTimeout(() => {
          this.loading = false;
        }, 0.5 * 1000);
      } else {
        return false;
      }
    });
  }
  private getOtherQuery(query: Dictionary<string>) {
    return Object.keys(query).reduce(
      (acc, cur) => {
        if (cur !== "redirect") {
          acc[cur] = query[cur];
        }
        return acc;
      },
      {} as Dictionary<string>
    );
  }
}
</script>

<style lang="scss">
// References: https://www.zhangxinxu.com/wordpress/2018/01/css-caret-color-first-line/
@supports (-webkit-mask: none) and (not (caret-color: $loginCursorColor)) {
  .login-container .el-input {
    input {
      color: $loginCursorColor;
    }
    input::first-line {
      color: $lightGray;
    }
  }
}
.login-container {
  .el-input {
    display: inline-block;
    height: 47px;
    width: 85%;
    input {
      height: 47px;
      background: transparent;
      border: 0px;
      border-radius: 0px;
      padding: 12px 5px 12px 15px;
      color: $lightGray;
      caret-color: $loginCursorColor;
      -webkit-appearance: none;
      &:-webkit-autofill {
        box-shadow: 0 0 0px 1000px $loginBg inset !important;
        -webkit-text-fill-color: #fff !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>
.login-container {
  position: relative;
  height: 100%;
  width: 100%;
  // overflow: hidden;
  // background-color: $loginBg;
  // background-image: url("../../../public/images/ts-vue-login-banner01.jpeg");
  // background-size: cover;
  // background-position: center center;
  // background-repeat: no-repeat;
  // background-attachment: fixed;
  .login-form {
    position: relative;
    width: 520px;
    max-width: 100%;
    padding: 160px 35px 0;
    margin: 0 auto;
    overflow: hidden;
  }
  .tips {
    font-size: 14px;
    color: #fff;
    margin-bottom: 10px;
    span {
      &:first-of-type {
        margin-right: 16px;
      }
    }
  }
  .svg-container {
    padding: 6px 5px 6px 15px;
    color: $darkGray;
    vertical-align: middle;
    width: 30px;
    display: inline-block;
  }
  .title-container {
    position: relative;
    .title {
      font-size: 26px;
      color: $lightGray;
      margin: 0px auto 40px auto;
      text-align: center;
      font-weight: bold;
    }
  }
  .show-pwd {
    position: absolute;
    right: 10px;
    top: 7px;
    font-size: 16px;
    color: $darkGray;
    cursor: pointer;
    user-select: none;
  }
}
.login-container::before {
  background-image: url("../../../public/images/ts-vue-login-banner01.jpeg");
  background-size: cover;
  background-position: center center;
  background-repeat: no-repeat;
  background-attachment: fixed;
  filter: alpha(opacity=80);
  -moz-opacity: 0.8;
  -khtml-opacity: 0.8;
  opacity: 0.8;
  content: "";
  display: block;
  z-index: -1;
  height: 100%;
  width: 100%;
  position: absolute;
  //一定要设置position:absolute,这样才能设置z-index，让背景处于内容的下一层
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
}
</style>
