<template>
  <el-row justify="space-between" type="flex">
    <el-col :span="24">
      <el-col :xs="8" :sm="4" :md="4" :xl="3" style="padding-top: .5rem;">
        <a class="navbar-brand" href="/" rel="nofollow">
          <img src="@/assets/rymcu.png" alt="RYMCU" class="navbar-brand-img">
        </a>
      </el-col>
      <el-col :xs="0" :sm="12" :md="8" :xl="8" style="text-align: center;">
        <el-row type="flex" justify="center">
          <el-col>
            <el-menu :default-active="getActiveMenu" style="margin-top: -2px;border: 0;" mode="horizontal"
                     @select="handleSelectMenu">
              <el-menu-item index="index">首页</el-menu-item>
              <el-menu-item index="topic">专题</el-menu-item>
            </el-menu>
          </el-col>
        </el-row>
      </el-col>
      <el-col :xs="16" :sm="8" :md="6" :xl="3" style="padding-top: 1rem;">
        <client-only>
          <el-col v-if="user" style="text-align: right;">
            <el-link rel="nofollow" :underline="false" style="padding-left: 10px;padding-right: 10px;" href="/article/post">发帖
            </el-link>
            <el-link rel="nofollow" :underline="false" style="padding-left: 10px;padding-right: 10px;">
              <el-dropdown trigger="click" @command="handleCommand">
                <el-badge :value="notificationNumbers" class="item">
                  <el-link rel="nofollow" :underline="false" style="font-size: 1.4rem;" class="el-icon-bell"></el-link>
                </el-badge>
                <el-dropdown-menu slot="dropdown">
                  <el-dropdown-item v-for="notification in notifications" :key="notification.idNotification"
                                    command="notification">{{ notification.dataSummary }}
                  </el-dropdown-item>
                  <el-dropdown-item command="notification">查看所有消息</el-dropdown-item>
                </el-dropdown-menu>
              </el-dropdown>
            </el-link>
            <el-link rel="nofollow" :underline="false" style="margin-left: 10px;">
              <el-dropdown trigger="click" @command="handleCommand">
                <el-avatar v-if="avatarURL" size="small" :src="avatarURL"></el-avatar>
                <el-avatar v-else size="small" src="https://static.rymcu.com/article/1578475481946.png"></el-avatar>
                <el-dropdown-menu slot="dropdown">
                  <el-dropdown-item command="user" style="align-items: center;">
                    <el-avatar class="mr-3" v-if="avatarURL" size="small" style="margin-top: 1rem;"
                               :src="avatarURL"></el-avatar>
                    <el-avatar class="mr-3" v-else size="small" style="margin-top: 1rem;"
                               src="https://static.rymcu.com/article/1578475481946.png"></el-avatar>
                    <el-link rel="nofollow" :underline="false" style="margin-left: 10px;margin-bottom: 1rem;">{{ nickname }}</el-link>
                  </el-dropdown-item>
                  <el-dropdown-item v-if="hasPermissions" command="admin-dashboard">系统管理</el-dropdown-item>
                  <el-dropdown-item command="user-info">资料与账号</el-dropdown-item>
                  <el-dropdown-item command="drafts">我的草稿</el-dropdown-item>
                  <el-dropdown-item command="logout" divided>退出登录</el-dropdown-item>
                </el-dropdown-menu>
              </el-dropdown>
            </el-link>
          </el-col>
          <el-col v-else style="text-align: right;">
            <nuxt-link to="/login">
              <el-link rel="nofollow" :underline="false" style="margin-left: 10px;">登录</el-link>
            </nuxt-link>
            <nuxt-link to="/register">
              <el-link rel="nofollow" :underline="false" style="margin-left: 10px;">注册</el-link>
            </nuxt-link>
          </el-col>
        </client-only>
      </el-col>
    </el-col>
  </el-row>
</template>

<script>
  import { isBrowser } from '~/environment'

  const Cookie = process.client ? require('js-cookie') : undefined
  export default {
    name: "MobileHeader",
    computed: {
      getActiveMenu() {
        return this.$store.state.activeMenu;
      },
      user() {
        return this.$store.state.oauth;
      },
      avatarURL() {
        let _ts = this;
        if (isBrowser) {
          if (!_ts.$store.state.userInfo) {
            let user = localStorage.getItem('user');
            if (user) {
              _ts.$store.commit('setUser', JSON.parse(user))
            }
          }
        }
        return _ts.$store.state.userInfo?.avatarURL;
      },
      nickname() {
        let _ts = this;
        if (isBrowser) {
          if (!_ts.$store.state.userInfo) {
            let user = localStorage.getItem('user');
            if (user) {
              _ts.$store.commit('setUser', JSON.parse(user))
            }
          }
        }
        return _ts.$store.state.userInfo?.nickname;
      },
      account() {
        let _ts = this;
        if (isBrowser) {
          if (!_ts.$store.state.userInfo) {
            let user = localStorage.getItem('user');
            if (user) {
              _ts.$store.commit('setUser', JSON.parse(user))
            }
          }
        }
        return _ts.$store.state.userInfo?.account;
      },
      hasPermissions() {
        return this.$store.getters.hasPermissions('blog_admin');
      }
    },
    data() {
      return {
        restaurants: [],
        state: '',
        timeout: null,
        show: false,
        notifications: [],
        notificationNumbers: ""
      };
    },
    watch: {
      user: function () {
        this.getUnreadNotifications();
      }
    },
    methods: {
      handleSelectMenu(item) {
        let _ts = this;
        let activeMenu = _ts.$store.state.activeMenu;
        if (activeMenu !== item) {
          switch (item) {
            case 'topic':
              _ts.$router.push({
                path: '/topic/news'
              })
              break;
            case 'github':
              window.open("https://github.com/rymcu");
              return false;
              break;
            default:
              _ts.$router.push(
                {
                  path: '/'
                }
              )
          }
        }
      },
      handleCommand(item) {
        let _ts = this;
        switch (item) {
          case 'user':
            _ts.$router.push({
              path: '/user/' + _ts.account
            })
            break;
          case 'user-info':
            _ts.$router.push({
              path: '/user/settings/account'
            })
            break;
          case 'logout':
            Cookie.remove('auth')
            _ts.$store.commit('setAuth', null)
            item = 'login';
            break;
          default:
            _ts.$router.push({
              name: item
            })
        }
      },
      getUnreadNotifications() {
        let _ts = this;
        if (_ts.user) {
          _ts.$axios.$get('/api/notification/unread').then(function (res) {
            if (res) {
              _ts.$set(_ts, 'notifications', res.notifications);
              _ts.$set(_ts, 'notificationNumbers', res.pagination.total === 0 ? "" : res.pagination.total);
            }
          })
        }
      },
      browserFingerprint() {
        let _ts = this
        let canvas = document.createElement('canvas');
        let ctx = canvas.getContext('2d');
        let txt = 'https://rymcu.com/';
        ctx.textBaseline = "top";
        ctx.font = "14px 'Arial'";
        ctx.textBaseline = "rymcu";
        ctx.fillStyle = "#f60";
        ctx.fillRect(125,1,62,20);
        ctx.fillStyle = "#069";
        ctx.fillText(txt, 2, 15);
        ctx.fillStyle = "rgba(102, 204, 0, 0.7)";
        ctx.fillText(txt, 4, 17);
        let b64 = canvas.toDataURL().replace("data:image/png;base64,","");
        let bin = atob(b64);
        let fingerprint = _ts.bin2hex(bin.slice(-16,-12));
        _ts.$store.commit('setFingerprint', fingerprint);
      },
      bin2hex(str) {
        let _ts = this
        let result = "";
        for (let i = 0; i < str.length; i++) {
          let c = str.charCodeAt(i);
          // 高字节
          result += _ts.byte2Hex(c >> 8 & 0xff);
          // 低字节
          result += _ts.byte2Hex(c & 0xff);
        }
        return result;
      },
      byte2Hex(b) {
        if (b < 0x10) {
          return "0" + b.toString(16);
        } else {
          return b.toString(16);
        }
      }
    },
    mounted() {
      let _ts = this
      let user = _ts.user;
      if (user) {
        _ts.getUnreadNotifications();
      }
      let fingerprint = _ts.$store.state.fingerprint
      if (!fingerprint) {
        _ts.browserFingerprint();
      }
    }

  }
</script>

<style scoped>
  .navbar-brand {
    color: inherit;
    margin-right: 1rem;
    font-size: 1.25rem;
    white-space: nowrap;
    font-weight: 600;
    padding: 0;
    transition: .3s opacity;
    line-height: 2rem;
  }

  .navbar-brand-img {
    height: 2rem;
    line-height: 2rem;
    vertical-align: bottom;
    margin-right: .5rem;
    width: auto;
  }
</style>
