<template>
    <div class="ultabs" :style="{'margin-top': dateShowType && (dateShowType === 'day' ||  dateShowType === 'month') ? '35px' : '10px'}">
      <div v-if="sideIcon" style="display: inline-block;padding-left: 1px;float: right;">
        <el-dropdown trigger="click">
          <span class="el-dropdown-link">
            <i style="font-size: 1.5rem;margin-top: 5px;" class="el-icon-s-tools"></i>
          </span>
          <el-dropdown-menu slot="dropdown">
            <el-dropdown-item v-for="item of sideIcon && sideIcon.iconName" class="clearfix">
              <div @click="onChange(item)">{{item.name}}</div>
            </el-dropdown-item>
          </el-dropdown-menu>
        </el-dropdown>
      </div>
      <ul style="display: inline-block;padding-left: 1px;vertical-align: middle;margin:0;float: right;">
        <template v-if="dateShowType === 'day'">
          <li :class="{ 'activesbgs' : isActive == 'DAY' }" @click="toggle('DAY',7)">前7天</li>
          <li :class="{ 'activesbgs' : isActive == 'WEEK' }" @click="toggle('WEEK',15)">前15天</li>
          <li :class="{ 'activesbgs' : isActive == 'MONTH' }" @click="toggle('MONTH')">前一个月</li>
        </template>
        <template v-if="dateShowType === 'month'">
          <li :class="{ 'activesbgs' : isActive == 'THREEMONTH' }" @click="toggle('THREEMONTH', 3)">前三个月</li>
          <li :class="{ 'activesbgs' : isActive == 'HALFYEAR' }" @click="toggle('HALFYEAR', 6)">前半年</li>
          <li :class="{ 'activesbgs' : isActive == 'YEAR' }" @click="toggle('YEAR', 12)">前一年</li>
        </template>
      </ul>
      <el-date-picker
              v-model="dateRange"
              :type="dateShowType === 'month' ? 'monthrange' : 'daterange'"
              :start-placeholder="dateShowType === 'month' ? '开始日期' : '开始时间'"
              :end-placeholder="dateShowType === 'month' ? '结束日期' : '结束时间'"
              range-separator="至"
              :format="dateShowType === 'month' ? 'yyyy-MM' : 'yyyy-MM-dd'"
              :value-format="dateShowType === 'month' ? 'yyyy-MM' : 'yyyy-MM-dd'"
              style="display: inline-block!important;width: 45%!important;vertical-align: middle;float: right;margin-right: 10px;"
              @change="dateChange"/>
    </div>
</template>

<script setup>
    export default {
      name: 'dateTimeSelect',
      props: {
        dateShowType: {
          type: String,
          default: null
        },
        sideIcon: {
          type: Object,
          default: () => {}
        }
      },
      data() {
        return {
          dateRange: [],
          isActive: ''
        }
      },
      // DOM 挂载完成后
      mounted() {
        this.isActive = this.dateShowType && this.dateShowType === 'day' ? 'MONTH' : 'YEAR';
        // 可以访问 DOM 元素
        // setTimeout(() => {
        //   // this.getLastDays(6);
        //   // this.getDaysOfPreviousMonth();
        //   this.$emit("dataChange", this.isActive, []);
        // }, 500);
      },
      methods: {
        toggle(val, num) {
          this.isActive = val;
          this.dateRange = [];
          if (val && val === 'MONTH') {
            this.getDaysOfPreviousMonth();
          } else if (val && (val === 'THREEMONTH' || val === 'HALFYEAR' || val === 'YEAR')) {
            this.getLastMonths(num);
          } else {
            this.getLastDays(num - 1);
          }
        },
        // 时间选择器
        dateChange() {
          this.$emit("dataChange", this.isActive, this.dateRange);
          this.isActive = '';
          // this.getDaysOfPreviousMonth(this.dateRange[0], this.dateRange[1]);
        },
        // 获取当前日期前7天的所有日期（格式：YYYY-MM-DD）
        getLastDays(num) {
          const dayList = [];
          const today = new Date();

          for (let i = num; i >= 0; i--) {
            const d = new Date(today);
            d.setDate(today.getDate() - i);

            // 格式化日期为 YYYY-MM-DD
            const year = d.getFullYear();
            const month = String(d.getMonth() + 1).padStart(2, '0');
            const day = String(d.getDate()).padStart(2, '0');

            dayList.push(`${year}-${month}-${day}`);
          }
          let timeArr = [dayList[0], dayList[dayList.length - 1]];
          this.$emit("dataChange", this.isActive, timeArr);
          // this.$emit("dataChange", this.isActive, dayList);
        },
        // 获取前一个月的所有日期
        getDaysOfPreviousMonth(star, end) {
          // 1. 获取当前日期（终点日期）
          const currentDate = new Date();
          const endYear = currentDate.getFullYear();
          const endMonth = currentDate.getMonth(); // 0=1月，11=12月
          const endDay = currentDate.getDate();     // 当前日（如8）

          // 2. 计算起点日期（当前日期的“上月同日”，处理边界：如3月31日→2月28/29日）
          const startDate = new Date(endYear, endMonth, endDay);
          // 核心：将当前日期的月份减1（得到上月同日，自动处理天数不足问题）
          startDate.setMonth(startDate.getMonth() - 1);

          // 3. 提取起点日期的年、月、日（用于循环判断）
          const startYear = startDate.getFullYear();
          const startMonth = startDate.getMonth();
          const startDay = startDate.getDate();

          // 4. 循环生成“起点~终点”的所有日期
          const dateCollection = [];
          // 临时日期：从起点日期开始递增
          const tempDate = new Date(startYear, startMonth, startDay);

          // 循环条件：临时日期 <= 当前日期（终点）
          while (tempDate <= currentDate) {
            // 格式化日期为“YYYY-MM-DD”（补零处理：如8月→08，5日→05）
            const year = tempDate.getFullYear();
            const month = String(tempDate.getMonth() + 1).padStart(2, '0');
            const day = String(tempDate.getDate()).padStart(2, '0');
            const formattedDate = `${year}-${month}-${day}`;

            dateCollection.push(formattedDate);

            // 临时日期加1天（进入下一天）
            tempDate.setDate(tempDate.getDate() + 1);
          }
          let timeArr = [dateCollection[0], dateCollection[dateCollection.length - 1]];
          this.$emit("dataChange", this.isActive, timeArr);
          // this.$emit("dataChange", this.isActive, oneMonthDays);
        },
        // 获取前三个月的月
        getLastMonths(num) {
          const threeMonths = [];
          const today = new Date(); // 当前日期
          const currentYear = today.getFullYear();
          const currentMonth = today.getMonth() + 1; // 月份从0开始（0=1月，11=12月）
          // 循环获取前3个月（i=0: 前1个月，i=1: 前2个月，i=2: 前3个月）
          for (let i = 1; i <= num; i++) {
            // 计算目标月份（当前月 - i）
            let targetMonth = currentMonth - i;
            let targetYear = currentYear;
            // 处理月份溢出（如1月-1=12月，年份减1）
            if (targetMonth < 0) {
              targetMonth += 12;
              targetYear -= 1;
            }
            // 格式化月份为两位数（如5月→'05'）
            const monthStr = String(targetMonth + 1).padStart(2, '0'); // 加1是因为月份从0开始
            threeMonths.unshift(`${targetYear}-${monthStr}`);
          }
          let timeArr = [threeMonths[0], threeMonths[threeMonths.length - 1]];
          this.$emit("dataChange", this.isActive, timeArr);
          // this.$emit("dataChange", this.isActive, threeMonths);
        },
        onChange(val){
          this.$emit("dataChange", null, null, val);
        },
      }
    }
</script>
<style scoped>
  ::v-deep .el-range-editor .el-range-input {
    vertical-align: super!important;
  }
  ::v-deep .el-date-editor .el-range-separator {
    vertical-align: super!important;
  }
  ::v-deep .el-date-editor .el-range__close-icon {
    margin-top: -38px;
    margin-right: -14px;
  }
    .ultabs {
      width: 500px;
      float: right;
      position: relative;
      z-index: 9;
    }

    .ultabs ul li {
        user-select: none;
        cursor: pointer;
        list-style: none;
        display: inline-block;
        width: 70px;
        text-align: center;
        height: 38px;
        line-height: 38px;
    }
    /*.ultabs ul li:nth-child样式做了更改*/
    .ultabs ul li {
        border-radius: 4px;
        border: 1px solid #CCCCCC;
        margin: 0 5px;
    }
    .activesbgs {
        color: #FFF;
        background: #5D78FF;
        cursor: pointer;
        list-style: none;
        display: inline-block;
        width: 70px;
        text-align: center;
        height: 40px !important;
        line-height: 40px !important;
        border: 1px solid #5D78FF;
    }
</style>
