<template>
  <nav v-outside="collapseMenu" class="one-nav" :class="{ expanded }">
    <header>
      <h2>{{ Config.app_name }}</h2>

      <section class="search">
        <one-search />
      </section>
      <div class="toggle" @click="toggleMenu">
        <veui-icon class="expanded-icon" name="chevron-left" />
        <veui-icon class="collapsed-icon" name="hamburger" />
      </div>
    </header>
    <veui-menu
      class="one-menu"
      :items="menuItems"
      :expanded.sync="menuExpanded"
    >
      <template #item-label="{ label, sub }">
        {{ label }}<small>{{ sub }}</small>
      </template>
    </veui-menu>
  </nav>
</template>

<script>
import i18n from "../common/i18n";
import OneSearch from "./OneSearch";
import { Menu, Icon } from "veui";
import outside from "veui/directives/outside";
import "veui-theme-dls-icons/hamburger";
import "veui-theme-dls-icons/chevron-left";
import Config from "../env";
export default {
  name: "one-menu",
  directives: {
    outside,
  },
  components: {
    "one-search": OneSearch,
    "veui-menu": Menu,
    "veui-icon": Icon,
  },
  mixins: [i18n],
  props: {
    expanded: Boolean,
    nav: {
      type: Array,
      default() {
        return [];
      },
    },
  },
  data() {
    return {
      Config,
      menuExpanded: [],
    };
  },
  computed: {
    altLocale() {
      let { canonicalPath, locale, getLocalePath, isPathDisabled } = this;
      let altLocale = locale === "zh-Hans" ? "en-US" : "zh-Hans";
      let label = locale === "zh-Hans" ? "English" : "中文";
      let disabled = isPathDisabled(canonicalPath, altLocale);
      return {
        to: disabled ? "" : getLocalePath(canonicalPath, altLocale),
        disabled,
        label,
      };
    },
    menuItems() {
      return this.nav.map((item) => this.normalizeItem(item));
    },
  },
  created() {
    this.menuExpanded = this.menuItems.map(({ name }) => name);
  },
  methods: {
    getTitleDetail(title) {
      let [main, sub] = title.split(" - ");
      return [main, sub];
    },
    isActive(path) {
      let { route = {} } = this.$router.resolve(path) || {};
      return route.name === this.$route.name;
    },
    normalizeItem({ title, children, slug, link, disabled }, base = "") {
      const fullSlug = `${base}/${slug}`;
      const localePath = this.getLocalePath(fullSlug);
      const to = link !== false && fullSlug && !disabled ? localePath : null;
      const [main, sub] = this.getTitleDetail(title);

      return {
        label: main,
        sub,
        to,
        name: fullSlug,
        disabled,
        children: children
          ? children.map((child) => this.normalizeItem(child, fullSlug))
          : [],
      };
    },
    toggleMenu() {
      this.$emit("toggle", !this.expanded);
    },
    collapseMenu() {
      this.$emit("toggle", false);
    },
  },
};
</script>

<style lang="stylus" scoped>
.one-nav {
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  display: flex;
  flex-direction: column;
  width: 280px;
  z-index: 1;
  background-color: #fff;

  header {
    padding: 32px 20px 20px;
    flex: none;
  }

  h2 {
    display: flex;
    align-items: center;
    margin: 0 0 16px;
    font-size: 20px;
    font-weight: 500;

    a {
      display: block;
    }

    & + .desc {
      display: flex;
      align-items: center;
      margin-bottom: 20px;

      img {
        display: block;
      }
    }
  }

  .locale-swith {
    display: block;
    margin-left: 12px;
    padding: 0 6px;
    border: 1px solid #dbdbdb;
    border-radius: 3px;
    line-height: 18px;
    font-size: 12px;
    text-align: center;
    text-decoration: none;
    transition: all 0.2s;

    &:hover {
      border-color: #999;
    }
  }

  .search {
    margin-top: 16px;
    margin-right: 12px;
    flex-shrink: 0;
  }
}

.one-menu {
  flex: 1 1 auto;
  width: 100%;
  overflow: auto;
  background-color: #fff;

  & >>> .DocSearch {
    margin: 0;
    border-radius: 6px;
    font: inherit;
  }

  small {
    margin-left: 8px;
    opacity: 0.7;
  }
}

.toggle {
  display: none;
}

.disabled {
  opacity: 0.3;
  pointer-events: none;
}

@media (max-width: 480px) {
  .one-nav {
    z-index: 20;
    transition: transform 0.3s, box-shadow 0.3s;
    transform: translateX(-100%);

    &.expanded {
      transform: translateX(0);
      box-shadow: 0 0 48px rgba(0, 0, 0, 0.2);
    }
  }

  header {
    position: relative;
  }

  .toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    position: absolute;
    top: 80px;
    left: 100%;
    border: 1px solid #e2e6f0;
    border-top-right-radius: 4px;
    border-bottom-right-radius: 4px;
    background-color: #fff;
    box-shadow: 0 0 12px rgba(0, 0, 0, 0.1);
    font-size: 20px;

    &::before {
      content: '';
      position: absolute;
      top: 0;
      bottom: 0;
      left: -19px;
      width: 20px;
      background-color: #fff;
    }
  }
}

.expanded-icon, .collapsed-icon {
  position: absolute;
  transition: transform 0.3s, opacity 0.3s;
}

.expanded-icon {
  margin-left: -4px;
  opacity: 0;
  transform: translateX(-10px);

  .expanded & {
    opacity: 1;
    transform: none;
  }
}

.collapsed-icon {
  .expanded & {
    opacity: 0;
    transform: translateX(10px);
  }
}
</style>
