<template>
  <message-box
    :title="$t('post.callFriends')"
    overflow="visible"
    @close="$emit('close')"
  >
    <div class="top">
      <div class="container-selectedCaller">
        <div
          v-for="(username, index) in selectedFriends"
          :key="index"
          class="selectedCaller"
        >
          <span>@ {{ username }}</span>
          <svg-icon
            style="font-size: 14px; cursor: pointer; fill: #6d6d6d"
            type="close"
            @click="
              selectedFriends.splice(selectedFriends.indexOf(username), 1)
            "
          />
        </div>
      </div>
      <div class="tip">{{ $t("post.searchFriends") }}</div>
      <div class="container-search-list">
        <label>
          <input
            ref="inputCaller"
            :placeholder="$t('post.pleaseInput')"
            type="text"
            class="input-caller"
            @input="searchUser"
          >
        </label>
        <div class="infinite-list-wrapper" style="overflow:auto">
          <ul v-infinite-scroll="load" infinite-scroll-disabled="disabled">
            <li
              v-for="(user, index) in searchList"
              :key="index"
              :class="{
                'infinite-list-item': true,
                selected: selectedFriends.indexOf(user.username) >= 0
              }"
              @click="selectFriendFromUl(user)"
            >
              {{ user.username }}
            </li>
          </ul>
          <p v-if="loading" class="loading-tip">{{ $t("core.loading") }}</p>
          <p v-if="noMore" class="loading-tip">{{ $t("core.noMoreData") }}</p>
        </div>
      </div>
      <div class="friends">
        <div class="title">{{ $t("post.myFriends") }}</div>
        <div v-loading="friendsLoading" class="container-caller">
          <div
            v-for="(user, index) in friends"
            :key="index"
            :class="{
              caller: true,
              selected: selectedFriends.indexOf(user.username) >= 0
            }"
            @click="
              selectedFriends.indexOf(user.username) >= 0
                ? selectedFriends.splice(
                  selectedFriends.indexOf(user.username),
                  1
                )
                : selectedFriends.push(user.username)
            "
          >
            <avatar :user="user" size="30" round prevent-jump />
            <span>{{ user.username }}</span>
          </div>
        </div>
      </div>
    </div>
    <div class="bottom">
      <div class="container">
        <span class="text">{{
          $t("post.chosen") +
            " " +
            selectedFriends.length +
            " " +
            $t("topic.personUnit")
        }}</span>
        <el-button
          :disabled="selectedFriends.length === 0"
          size="medium"
          type="primary"
          @click="$emit('selectedCaller', formatValue())"
        >{{ $t("post.confirmChoice") }}</el-button>
      </div>
    </div>
  </message-box>
</template>

<script>
const include = 'fromUser,toUser.groups';
import handleError from '@/mixin/handleError';
export default {
  name: 'Caller',
  mixins: [handleError],
  data() {
    return {
      friends: [],
      friendsLoading: true,
      selectedFriends: [],
      searchList: [],
      searchValue: '',
      searchTotal: 10,
      loading: false,
      setTimeoutId: null,
      pageLimit: 10,
      pageNumber: 1
    };
  },
  computed: {
    noMore() {
      if (this.searchValue && !this.loading) {
        return this.searchList.length >= this.searchTotal;
      }
      return false;
    },
    disabled() {
      return this.loading || this.noMore;
    }
  },
  mounted() {
    this.getFriends();
  },
  methods: {
    getFriends() {
      const params = { 'filter[type]': 2, include };
      return this.$store.dispatch('jv/get', ['follow', { params }]).then(
        data => {
          this.friendsLoading = false;
          this.friends = data.filter(item => item.is_mutual === 1);
          this.friends = this.friends.map(item => item.fromUser);
        },
        e => this.handleError(e)
      );
    },
    searchUser(e) {
      this.searchValue = e.target.value;
      this.pageNumber = 1;
      this.searchList = [];
      if (this.setTimeoutId) window.clearTimeout(this.setTimeoutId);
      if (!this.searchValue) return;
      this.setTimeoutId = setTimeout(() => {
        this.loading = true;
        this.getSearchList();
        this.setTimeoutId = null;
      }, 300);
    },
    getSearchList() {
      const params = {
        'filter[username]': `*${this.searchValue}*`,
        'filter[status]': 'normal',
        'page[limit]': this.pageLimit,
        'page[number]': this.pageNumber
      };
      this.$store.dispatch('jv/get', ['users', { params }]).then(
        data => {
          const {
            _jv: {
              json: { meta }
            }
          } = data;
          // const { _jv: { json: { links }}} = data
          this.loading = false;
          this.searchTotal = meta.total;
          // data.length > 0 && links.first.split('username')[1].split('%2A')[1] === this.searchValue
          if (data.length > 0) this.searchList.push(...data);
        },
        e => this.handleError(e)
      );
    },
    load() {
      // bug 避免无 searchList 时触发
      if (this.searchValue && this.searchList.length > 0) {
        this.loading = true;
        this.pageNumber += 1;
        this.getSearchList();
      }
    },
    formatValue() {
      let callerList = [...this.selectedFriends];
      callerList = callerList.map(item => `${item} `);
      return ` @${callerList.join('@')}`;
    },
    selectFriendFromUl(user) {
      this.selectedFriends.indexOf(user.username) < 0
        && this.selectedFriends.push(user.username);
      this.clear();
    },
    clear() {
      this.$refs.inputCaller.value = '';
      this.searchValue = '';
      this.searchList = [];
    }
  }
};
</script>

<style lang="scss" scoped>
@import "@/assets/css/variable/color.scss";
$font-color: #6d6d6d;
.top {
  z-index: 100;
  padding: 40px;
  color: $font-color;

  > .container-selectedCaller {
    min-height: 45px;
    > .selectedCaller {
      display: inline-block;
      padding: 0 15px;
      background: $background-color-grey;
      border-radius: 17.5px;
      margin-right: 10px;
      margin-bottom: 10px;
      height: 35px;
      line-height: 35px;
      font-size: 16px;
    }
  }

  > .tip {
    font-size: 16px;
    margin-top: 10px;
  }

  > .container-search-list {
    margin-top: 10px;
    position: relative;
    height: 35px;
    width: 100%;
    .input-caller {
      height: 100%;
      width: 100%;
      border: none;
      background: transparent;
      color: #333;
      font-size: 14px;
      border-bottom: 1px solid $border-color-base;
    }
    > .infinite-list-wrapper {
      z-index: 100;
      position: absolute;
      top: 40px;
      left: 0;
      background: #ffffff;
      min-width: 200px;
      max-height: 300px;
      box-shadow: 0 5px 10px rgba(0, 0, 0, 0.3);
      border-radius: 3px;
      overscroll-behavior: contain;
      ul {
        > li {
          height: 50px;
          width: 100%;
          line-height: 50px;
          border-bottom: 1px solid $border-color-base;
          padding: 0 10px;
          color: #6d6d6d;
          font-size: 14px;
          cursor: pointer;
          white-space: nowrap;
          margin-right: 15px;
          &.selected {
            background: #e5f2ff;
          }
          &:hover {
            background: #ededed;
          }
        }
      }
      .loading-tip {
        height: 50px;
        width: 100%;
        line-height: 50px;
        padding: 0 10px;
        color: #333;
        font-size: 14px;
      }
    }
  }

  > .friends {
    margin-top: 20px;

    > .title {
      font-size: 16px;
    }

    > .container-caller {
      margin-top: 16px;
      display: flex;
      justify-content: flex-start;
      flex-wrap: wrap;
      > .caller {
        cursor: pointer;
        display: inline-flex;
        align-items: center;
        margin-right: 10px;
        margin-bottom: 10px;
        padding: 0 5px;
        height: 40px;
        line-height: 40px;
        min-width: 120px;
        background: $background-color-grey;
        font-size: 14px;
        border-radius: 20px;
        > span {
          margin: 0 5px;
        }

        &.selected {
          background: #e5f2ff;
          border: 1px solid #ccddff;
        }
      }
    }
  }
}

.bottom {
  height: 55px;
  padding: 0 20px;
  display: flex;
  justify-content: flex-end;
  align-items: center;
  background: $background-color-editor;

  > .container {
    height: 36px;

    .text {
      margin-right: 20px;
    }
  }
}
</style>
