<template>
    <div class="el-quarter-wrap">
      <el-popover width="280" v-model="visible">
        <template #reference>
          <el-input v-model="quarterDate" placeholder="请选择季度" clearable :prefix-icon="Calendar" readonly
           @change="quarterDateChange" style="width: 300px;">
            <template #suffix>
              <el-icon v-if="quarterDate" class="el-quarter-clear" @click="clearData">
                <Close />
              </el-icon>
            </template>
          </el-input>
        </template>
        <div class="el-quarter__header">
          <span class="el-quarter-btn el-quarter-btn__pre" @click="changeShowYear(-1)">
            <el-icon>
              <DArrowLeft />
            </el-icon>
          </span>
          <div class="el-quarter__header-text" @click="showYearList">
            {{ quarterTitle }}
          </div>
  
          <span class="el-quarter-btn el-quarter-btn__next" @click="changeShowYear(1)">
            <el-icon>
              <DArrowRight />
            </el-icon>
          </span>
        </div>
  
        <div class="el-quarter__content" v-if="!isEditYear">
          <div class="el-quarter__row">
            <span 
                class="quarter-index" 
                :class="{ 'is-active': showYear === pickerYear && quarterIndex === index }" 
                @click="pickerQuarte(index)"
                v-for="(item, index) in ['第一季度', '第二季度','第三季度','第四季度',]"
            >{{ item }}</span>
          </div>
        </div>
  
        <div class="el-year__content" v-else>
          <div class="el-year-item" v-for="item in yearList">
            <div class="cell" :class="{ 'is-active': showYear == item }" @click="selectYear(item)">
              {{ item }}
            </div>
          </div>
        </div>
  
      </el-popover>
    </div>
  </template>
  
  <script lang="ts" setup>
  import { DArrowLeft, DArrowRight, Close, Calendar } from '@element-plus/icons-vue'
  import { computed, onMounted, reactive, ref } from 'vue'
  let visible = ref(false)
  
  let quarterDate = ref('')
  let pickerYear = ref('') as any
  let showYear = ref('') as any
  let quarterIndex = ref(-1)
  let isEditYear = ref(false)
  let startYear = ref('') as any
  let yearList = reactive([] as any)
  
  const quarterTitle = computed(() => {
    if(isEditYear.value) {
      return startYear.value+ "年 - " + (startYear.value + 9) + "年"
    } else {
      return showYear.value + '年'
    }
  })
  function pickerQuarte(index:number) {
    quarterIndex.value = index
    pickerYear.value = showYear.value
    quarterDate.value = pickerYear.value + "-Q" + index
  }
  function changeShowYear(num: number) {
    if(isEditYear.value) {
      startYear.value = startYear.value + (num * 10)
      changeYearList()
    } else {
      showYear.value = showYear.value + num
    }
  }
  
  function clearData() {
    quarterDate.value = ''
    pickerYear.value = ''
    showYear.value = new Date().getFullYear()
    quarterIndex.value = 0
  }
  function quarterDateChange(value:any) {
    const splitArray = value.split('-Q')
    if (splitArray.length < 2) {
      pickerYear.value = ''
      showYear.value = new Date().getFullYear()
      quarterIndex.value = 0
    } else {
      pickerYear.value = splitArray[0]
      showYear.value = splitArray[0]
      quarterIndex.value = splitArray[1]
    }
  }
  function changeYearList() {
    yearList = []
    let year = startYear.value
    for (let i = 0; i < 10; i++) {
      yearList.push(year++)
    }
  }
  
  function showYearList() {
    if(!isEditYear.value) {
      startYear.value = Number(Math.floor(showYear.value / 10) + '0')
      changeYearList()
      isEditYear.value = true
    } else {
      isEditYear.value = false
    }
   
  }
  function selectYear(item:any) {
    showYear.value = item
    isEditYear.value = false
  }
  
  onMounted(() => {
    showYear.value = new Date().getFullYear()
    startYear.value = Number(Math.floor(showYear.value / 10) + '0')
    changeYearList()
  })
  </script>
  <style lang="scss">
  .el-quarter__header {
    padding-bottom: 12px;
    border-bottom: 1px solid #ebeef5;
    display: flex;
    align-items: center;
    justify-content: space-between;
    .el-quarter-btn {
      font-size: 12px;
    }
    .el-quarter__header-text {
      font-size: 16px;
      font-weight: 500;
      text-align: center;
      cursor: pointer;
    }
  }
  .el-quarter__content {
    min-height: 60px;
    box-sizing: border-box;
    display: flex;
    flex-direction: column;
    justify-content: space-around;
    .el-quarter__row {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      .quarter-index {
        display: block;
        padding: 4px 10px;
        width: 50%;
        text-align: center;
        cursor: pointer;
        &:hover {
          color: #337ecc
        }
      }
      .is-active {
        color: #409eff
      }
    }
  }
  .el-quarter-clear {
    position: relative;
    color: #909399;
    display: none;
    height: 12px;
    width: 12px;
    cursor: pointer;
    &::after {
      content: '';
      position: absolute;
      height: 14px;
      width: 14px;
      margin: auto;
      border-radius: 50%;
      border: 1px solid #909399
    }
  }
  .el-input {
    &:hover {
      .el-quarter-clear {
        display: flex;
      }
    }
  }
  .el-year__content {
    min-height: 100px;
    display: flex;
    padding: 10px 0;
    flex-wrap: wrap;
    .el-year-item {
      width: calc(100% / 4);
      display: flex;
      align-items: center;
      justify-content: center;
      .cell {
        padding: 4px 10px;
        width: fit-content;
        cursor: pointer;
        cursor: pointer;
        white-space: nowrap;
        &:hover {
          color: #337ecc
        }
      }
      .is-active {
        color: #409eff
      }
    }
  }</style>