<template>
	//月选择器
	//:clearable="false" 去掉×
	 <div class="monthCard">
	    <el-date-picker
	            :clearable="false"
	            v-model="monthValue"
	            type="month"
	            placeholder="选择月"
	            @change="handleChangeMonth($event)">
	    </el-date-picker>
	</div>
	//周选择器
	<div class="weekCard">
	    <el-date-picker
	            :clearable="false"
	            v-model="dateValue"
	            type="week"
	            :format="bill_date.date"
	            :picker-options="onPicker"
	            placeholder="选择周"
	            @change="showDate($event)">
	    </el-date-picker>
	</div>
	//自定义时间选择器
	<div class="customCard">
	    <el-date-picker
	            :clearable="false"
	            v-model="pickDate"
	            type="daterange"
	            value-format="yyyy-MM-dd"
	            align="right"
	            unlink-panels
	            range-separator="至"
	            :picker-options="pickerBeginDateBefore"
	            start-placeholder="开始日期"
	            end-placeholder="结束日期"
	            @change='selectData'>
	    </el-date-picker>
	</div>
</template>

<script>
import dayjs from 'dayjs'; //一个时间插件
import format_date from "@/utils/date_format.js"; //格式化时间
export default {
    name: "ThreeClearHome",
    data: function() {
        return {
            pickDate: ['2023-08-01','2023-09-05'], //自定义时间默认值
            timeOptionRange: null,
            pickerBeginDateBefore: {
                "firstDayOfWeek": 1, //选择器时间从周一开始
                onPick: ({maxDate, minDate}) => {
                    if (minDate && !maxDate) {
                        this.timeOptionRange = minDate;
                    }
                    if (maxDate) {
                        this.timeOptionRange = null;
                    }
                },
                //限制只能选择当前时间前后六个月的时间
                disabledDate: (time) => {
                    // 设置六个月的时间戳
                    let secondNum = 6 * 30 * 24 * 60 * 60 * 1000;
                    // 获取选中时间
                    let timeOptionRange = this.timeOptionRange;
                    if (timeOptionRange) {
                        return time.getTime() > timeOptionRange.getTime() + secondNum || time.getTime() < timeOptionRange.getTime() - secondNum;
                    }
                }
            },

            dateValue: '', //周选择器的默认值
            weekStartDate: '', //起始日期
            weekEndDate: '', //截止日期
            onPicker: {
                "firstDayOfWeek": 1,
            },
            bill_date: {},

            monthValue: '', //月选择器的默认值

            startDate: '',
            endDate: '',
        };
    },
    props: {
    },
    computed: {
    },
    components: {
    },
    watch: {
    },
    methods: {
        /*按周切换*/
        showDate() {
            let vm = this;
            let startTime = dayjs(vm.dateValue).subtract(1, 'day').$d;
            let endTime = dayjs(startTime).add(6, 'day').$d;
            vm.weekStartDate = format_date("yyyy-MM-dd", new Date(startTime));
            vm.weekEndDate = format_date("yyyy-MM-dd", new Date(endTime));
            vm.bill_date = Object.assign({}, vm.bill_date, {'date': vm.weekStartDate + ' 至 ' + vm.weekEndDate});
        },
        // 获取当前日期的上一周
        getlastWeek() {
            let vm = this;
            const today = new Date(); //获取今天日期
            const d = today.getDay(); //计算今天是周几。如果是周天，d=0
            let w = 0;
            if (d === 0) {
                w = 7;
            } else {
                w = d;
            }
            const endTime = today.setDate(today.getDate() - w);
            const startTime = dayjs(endTime).subtract(6, 'day').$d;
            vm.weekEndDate = format_date("yyyy-MM-dd", new Date(endTime));
            vm.weekStartDate = format_date("yyyy-MM-dd", new Date(startTime));
            vm.dateValue = format_date("yyyy-MM-dd", new Date(startTime));
            vm.bill_date = Object.assign({}, vm.bill_date, {'date': vm.weekStartDate + ' 至 ' + vm.weekEndDate});
        },
        /*自定义切换*/
        selectData($event) {
            let vm = this;
            if ($event===null) {
                vm.timeOptionRange = null;
                vm.pickerBeginDateBefore={
                    disabledDate: (time) => {
                        // 设置六个月的时间戳
                        let secondNum = 6 * 30 * 24 * 60 * 60 * 1000;
                        // 获取选中时间
                        let timeOptionRange = vm.timeOptionRange;
                        if (timeOptionRange) {
                            return time.getTime() > timeOptionRange.getTime() + secondNum || time.getTime() < timeOptionRange.getTime() - secondNum;
                        }
                    }
                };
            } else {
                vm.customStartDate = $event[0];
                vm.customEndDate = $event[1];
            }
        },
        /*按月切换*/
        handleChangeMonth($event) {
            let vm = this;
            let date = new Date($event);
            let month = (date.getMonth() + 1).toString().padStart(2, '0');
            let year = date.getFullYear();
            let startTime = year + '-' + month + '-' + '01';
            let day = new Date(year, month, 0);
            let endTime = year + '-' + month + '-' + day.getDate();
            vm.monthStartDate = startTime;
            vm.monthEndDate = endTime;
        },
        // 获取当前日期的上一个月
        getlastMonth() {
            let now = new Date();
            // 当前月的日期
            let nowDate = now.getDate();
            let lastMonth = new Date(now.getTime());
            // 设置上一个月（这里不需要减1）
            lastMonth.setMonth(lastMonth.getMonth());
            // 设置为0，默认为当前月的最后一天
            lastMonth.setDate(0);
            // 上一个月的天数
            let daysOflastMonth = lastMonth.getDate();
            // 设置上一个月的日期，如果当前月的日期大于上个月的总天数，则为最后一天
            lastMonth.setDate(nowDate > daysOflastMonth ? daysOflastMonth : nowDate);
            return lastMonth;
        },
    },
    created() {
    },
    mounted: function() {
    	let vm = this;
        vm.monthValue = format_date("yyyy-MM", new Date(vm.getlastMonth()));
        vm.handleChangeMonth(vm.monthValue);
        vm.getlastWeek();
    }
};
</script>