<template>
  <div>
    <header id="page-header">
      <a
        class="link-skip-nav btn btn-light"
        href="#main-content"
        @click="setFocus"
      >
        {{ $t('appHeader.skipToContent') }}
      </a>

      <b-navbar type="dark" :aria-label="$t('appHeader.applicationHeader')">
        <!-- Left aligned nav items -->
        <b-button
          id="app-header-trigger"
          class="nav-trigger"
          aria-hidden="true"
          type="button"
          variant="link"
          :class="{ open: isNavigationOpen }"
          @click="toggleNavigation"
        >
          <icon-close
            v-if="isNavigationOpen"
            :title="$t('appHeader.titleHideNavigation')"
          />
          <icon-menu
            v-if="!isNavigationOpen"
            :title="$t('appHeader.titleShowNavigation')"
          />
        </b-button>
        <b-navbar-nav>
          <b-navbar-brand
            class="mr-0"
            to="/"
            data-test-id="appHeader-container-overview"
          >
            <img
              class="header-logo"
              src="@/assets/images/logo-header.svg"
              :alt="altLogo"
            />
          </b-navbar-brand>
          <div v-if="assetTag" class="asset-tag">
            <span class="pr-2">|</span>
            <span>{{ assetTag }}</span>
          </div>
        </b-navbar-nav>
        <!-- Right aligned nav items -->
        <b-navbar-nav class="ml-auto helper-menu">
          <b-nav-item
            to="/health/event-logs"
            data-test-id="appHeader-container-health"
          >
            <status-icon :status="healthStatusIcon" />
            {{ $t('appHeader.health') }}
          </b-nav-item>
          <b-nav-item
            to="/control/server-power-operations"
            data-test-id="appHeader-container-power"
          >
            <status-icon :status="serverStatusIcon" />
            {{ $t('appHeader.power') }}
          </b-nav-item>
          <!-- Using LI elements instead of b-nav-item to support semantic button elements -->
          <li class="nav-item">
            <b-button
              id="app-header-refresh"
              variant="link"
              data-test-id="appHeader-button-refresh"
              @click="refresh"
            >
              <icon-renew :title="$t('appHeader.titleRefresh')" />
              <span class="responsive-text">{{ $t('appHeader.refresh') }}</span>
            </b-button>
          </li>
          <li class="nav-item">
            <b-dropdown
              id="app-header-user"
              variant="link"
              right
              data-test-id="appHeader-container-user"
            >
              <template #button-content>
                <icon-avatar :title="$t('appHeader.titleProfile')" />
                <span class="responsive-text">{{ username }}</span>
              </template>
              <b-dropdown-item
                to="/profile-settings"
                data-test-id="appHeader-link-profile"
                >{{ $t('appHeader.profileSettings') }}
              </b-dropdown-item>
              <b-dropdown-item
                data-test-id="appHeader-link-logout"
                @click="logout"
              >
                {{ $t('appHeader.logOut') }}
              </b-dropdown-item>
            </b-dropdown>
          </li>
        </b-navbar-nav>
      </b-navbar>
    </header>
    <loading-bar />
  </div>
</template>

<script>
import BVToastMixin from '@/components/Mixins/BVToastMixin';
import IconAvatar from '@carbon/icons-vue/es/user--avatar/20';
import IconClose from '@carbon/icons-vue/es/close/20';
import IconMenu from '@carbon/icons-vue/es/menu/20';
import IconRenew from '@carbon/icons-vue/es/renew/20';
import StatusIcon from '@/components/Global/StatusIcon';
import LoadingBar from '@/components/Global/LoadingBar';

export default {
  name: 'AppHeader',
  components: {
    IconAvatar,
    IconClose,
    IconMenu,
    IconRenew,
    StatusIcon,
    LoadingBar,
  },
  mixins: [BVToastMixin],
  data() {
    return {
      isNavigationOpen: false,
      altLogo: `${process.env.VUE_APP_COMPANY_NAME} logo`,
    };
  },
  computed: {
    assetTag() {
      return this.$store.getters['global/assetTag'];
    },
    isAuthorized() {
      return this.$store.getters['global/isAuthorized'];
    },
    serverStatus() {
      return this.$store.getters['global/serverStatus'];
    },
    healthStatus() {
      return this.$store.getters['eventLog/healthStatus'];
    },
    serverStatusIcon() {
      switch (this.serverStatus) {
        case 'on':
          return 'success';
        case 'error':
          return 'danger';
        case 'diagnosticMode':
          return 'warning';
        case 'off':
        default:
          return 'secondary';
      }
    },
    healthStatusIcon() {
      switch (this.healthStatus) {
        case 'OK':
          return 'success';
        case 'Warning':
          return 'warning';
        case 'Critical':
          return 'danger';
        default:
          return 'secondary';
      }
    },
    username() {
      return this.$store.getters['global/username'];
    },
  },
  watch: {
    isAuthorized(value) {
      if (value === false) {
        this.errorToast(this.$t('global.toast.unAuthDescription'), {
          title: this.$t('global.toast.unAuthTitle'),
        });
      }
    },
  },
  created() {
    // Reset auth state to check if user is authenticated based
    // on available browser cookies
    this.$store.dispatch('authentication/resetStoreState');
    this.getServerInfo();
    this.getEvents();
  },
  mounted() {
    this.$root.$on(
      'change-is-navigation-open',
      (isNavigationOpen) => (this.isNavigationOpen = isNavigationOpen)
    );
  },
  methods: {
    getServerInfo() {
      this.$store.dispatch('global/getServerStatus');
    },
    getEvents() {
      this.$store.dispatch('eventLog/getEventLogData');
    },
    refresh() {
      this.$emit('refresh');
    },
    logout() {
      this.$store.dispatch('authentication/logout');
    },
    toggleNavigation() {
      this.$root.$emit('toggle-navigation');
    },
    setFocus(event) {
      event.preventDefault();
      this.$root.$emit('skip-navigation');
    },
  },
};
</script>

<style lang="scss">
@mixin focus-box-shadow($padding-color: $navbar-color, $outline-color: $white) {
  box-shadow: inset 0 0 0 3px $padding-color, inset 0 0 0 5px $outline-color;
}
.app-header {
  .link-skip-nav {
    position: absolute;
    top: -60px;
    left: 0.5rem;
    z-index: $zindex-popover;
    transition: $duration--moderate-01 $exit-easing--expressive;
    &:focus {
      top: 0.5rem;
      transition-timing-function: $entrance-easing--expressive;
    }
  }
  .navbar-text,
  .nav-link,
  .btn-link {
    color: color('white') !important;
    fill: currentColor;
    padding: 0.68rem 1rem !important;

    &:hover {
      background-color: theme-color-level(light, 10);
    }
    &:active {
      background-color: theme-color-level(light, 9);
    }
    &:focus {
      @include focus-box-shadow;
      outline: 0;
    }
  }

  .nav-item {
    fill: theme-color('light');
  }

  .navbar {
    padding: 0;
    background-color: $navbar-color;
    @include media-breakpoint-up($responsive-layout-bp) {
      height: $header-height;
    }

    .helper-menu {
      @include media-breakpoint-down(sm) {
        background-color: gray('800');
        width: 100%;
        justify-content: flex-end;

        .nav-link,
        .btn {
          padding: $spacer / 1.125 $spacer / 2;
        }

        .nav-link:focus,
        .btn:focus {
          @include focus-box-shadow($gray-800);
        }
      }

      .responsive-text {
        @include media-breakpoint-down(xs) {
          display: none;
        }
      }
    }
  }

  .navbar-nav {
    padding: 0 $spacer;
    align-items: center;

    .navbar-brand,
    .nav-link {
      transition: $focus-transition;
    }
    .asset-tag {
      color: theme-color-level(light, 3);
    }
  }

  .nav-trigger {
    fill: theme-color('light');
    width: $header-height;
    height: $header-height;
    transition: none;
    display: inline-flex;
    flex: 0 0 20px;
    align-items: center;

    svg {
      margin: 0;
    }

    &:hover {
      fill: theme-color('light');
      background-color: theme-color-level(light, 10);
    }

    &.open {
      background-color: gray('800');
    }

    @include media-breakpoint-up($responsive-layout-bp) {
      display: none;
    }
  }

  .dropdown-menu {
    margin-top: 0;

    @include media-breakpoint-only(md) {
      margin-top: 4px;
    }
  }

  .navbar-expand {
    @include media-breakpoint-down(sm) {
      flex-flow: wrap;
    }
  }
}

.navbar-brand {
  padding: $spacer/2;
  height: $header-height;
  line-height: 1;
  &:focus {
    box-shadow: inset 0 0 0 3px $navbar-color, inset 0 0 0 5px color('white');
    outline: 0;
  }
}
</style>