import { Button, Calendar, Icon, Image, Popup, Tag } from 'vant'
import 'vant/es/calendar/style'
import { defineComponent } from 'vue'
import dayjs from 'dayjs'
import styles from './index.module.less'
import IconArrow from '@/common/images/icon_arrow.png'
import IconClock from '@/common/images/icon_clock.png'
import { ElButton, ElDialog, ElMessage } from 'element-plus'

export default defineComponent({
  name: 'calendar',
  props: {
    calendarDate: {
      type: Date,
      default: () => new Date()
    },
    // 选中的数据
    selectList: {
      type: Array,
      default: []
    },
    // 接口数据
    list: {
      type: Object,
      default: {}
    },
    /**
     * 每天选择课程最大数
     */
    maxDays: {
      type: [Number, String],
      default: 0
    },
    /**
     * 点击并选中任意日期时触发
     */
    onSelect: {
      type: Function,
      default: (date: Date) => {}
    },
    /**
     * 上一月，不能小于当月
     */
    prevMonth: {
      type: Function,
      default: (date: Date) => {}
    },
    /**
     * 下一月，暂无限制
     */
    nextMonth: {
      type: Function,
      default: (date: Date) => {}
    },
    /**
     * 日期选择结束时触发
     */
    selectDay: {
      type: Function,
      default: (obj: any) => {}
    },
    isSkipHolidays: {
      // 是否跳过节假日
      type: Boolean,
      default: false
    }
  },
  data() {
    return {
      minDate: new Date(),
      maxDate: new Date(),
      currentDate: new Date(), // 当前日历日期
      subtitle: '',
      show: false,
      dayList: [],
      selectDays: [] as any
    }
  },
  computed: {
    arrowStatus() {
      // 上月箭头状态
      return !dayjs().isBefore(dayjs(this.currentDate), 'month')
    },
    selectDayTitle() {
      // 选中日期标题
      return dayjs(this.currentDate).format('YYYY-MM-DD')
    },
    isPrevDay() {
      // 是否可以点击上一天
      return dayjs(this.currentDate)
        .subtract(1, 'day')
        .isBefore(dayjs(this.minDate), 'day')
    },
    isNextDay() {
      // 是否可以点击下一天
      return dayjs(this.currentDate)
        .add(1, 'day')
        .isAfter(dayjs(this.maxDate), 'day')
    }
  },
  mounted() {
    // 初始化标题和最大显示日期
    this.subtitle = dayjs().format('YYYY年MM月')
    this.maxDate = dayjs().endOf('month').toDate()
    this.minDate = dayjs().add(1, 'day').toDate()

    // 初始化日历
    // console.log(this.list, 323, this.maxDays)
  },
  methods: {
    formatter(date: any) {
      const dateStr = dayjs(date.date).format('YYYY-MM-DD')
      const dateObj = this.list[dateStr]
      // 判断是否有课程 并且 时间在当前时间之后
      if (dateObj && dayjs().isBefore(dayjs(date.date))) {
        if (
          dateObj &&
          (dateObj.fullCourse ||
            !dateObj?.courseTime ||
            dateObj?.courseTime?.length <= 0)
        ) {
          date.bottomInfo = '满'
          date.className = 'full'
          date.type = 'disabled'
        }
      } else {
        date.type = 'disabled'
      }
      if (dateObj && this.isSkipHolidays && dateObj.holiday) {
        // date.bottomInfo = '节假日'
        date.type = 'disabled'
      }

      date.type = date.type === 'selected' ? '' : date.type
      return date
    },
    onPrevMonth() {
      // 上一月
      if (this.arrowStatus) return
      const tempDate = dayjs(this.currentDate).subtract(1, 'month')
      this._monthChange(tempDate)
      this.prevMonth && this.prevMonth(this.minDate)
    },
    onNextMonth() {
      // 下一月
      const tempDate = dayjs(this.currentDate).add(1, 'month')
      this._monthChange(tempDate)
      this.nextMonth && this.nextMonth(this.minDate)
    },
    _monthChange(date: any) {
      // 月份改变
      // 需要判断是否是当月，需要单独处理最小时间
      const currentMinDate = dayjs().add(1, 'day').toDate()
      const monthMinDate = date.startOf('month').toDate()
      this.minDate = dayjs(currentMinDate).isAfter(monthMinDate)
        ? currentMinDate
        : monthMinDate
      // this.minDate = date.startOf('month').toDate()
      this.maxDate = date.endOf('month').toDate()
      this.currentDate = date.toDate()
      this.$emit('update:calendarDate', date.toDate())
      this.subtitle = date.format('YYYY年MM月')
    },
    onSelectDay(item: any) {
      // 选择某个时间段
      const index = this.selectDays.findIndex((days: any) => {
        return days.startTime === item.startTime
      })
      if (this.selectDays.length < this.maxDays || index !== -1) {
        const index = this.selectDays.findIndex(
          (days: any) => days.startTime === item.startTime
        )
        item.checked = !item.checked
        if (index === -1) {
          this.selectDays.push({ ...item })
        } else {
          this.selectDays.splice(index, 1)
        }
      } else {
        ElMessage.info('最多选择' + this.maxDays + '个时间段')
      }
    },
    onPrevDay() {
      // 获取上一天的数据
      const tempDate = dayjs(this.currentDate).subtract(1, 'day')
      this._dayChange(tempDate.toDate())
    },
    onNextDay() {
      // 获取下一天的数据
      const tempDate = dayjs(this.currentDate).add(1, 'day')
      this._dayChange(tempDate.toDate())
    },
    onDateSelect(date: any) {
      // 选择日历上某一个日期
      this.selectDays = [...this.selectList] // 初始化用户选中的值
      this._dayChange(date)
      this.onSelect && this.onSelect(date)
    },
    _dayChange(date: Date) {
      const dateStr = dayjs(date).format('YYYY-MM-DD')
      let dataList = (this.list[dateStr] && this.list[dateStr].courseTime) || []
      dataList.forEach((item: any) => {
        item.start = dayjs(item.startTime).format('HH:mm')
        item.end = dayjs(item.endTime).format('HH:mm')
        const isExist = this.selectDays?.some(
          (course: any) => course.startTime === item.startTime
        )
        item.checked = isExist
      })
      this.dayList = dataList
      this.currentDate = date // 更新当前日期
      this.$emit('update:calendarDate', date)
      this.show = true
    }
  },
  render() {
    return (
      <>
        <Calendar
          class={styles.calendar}
          showTitle={false}
          poppable={false}
          showConfirm={false}
          showMark={false}
          firstDayOfWeek={1}
          rowHeight={56}
          minDate={this.minDate}
          maxDate={this.maxDate}
          color="var(--van-primary)"
          formatter={this.formatter}
          onSelect={this.onDateSelect}
          v-slots={{
            subtitle: () => (
              <div class={styles.subtitle}>
                <Icon
                  name={IconArrow}
                  size={22}
                  class={this.arrowStatus && styles.disabled}
                  onClick={this.onPrevMonth}
                />
                <span>{this.subtitle}</span>
                <Icon
                  name={IconArrow}
                  size={22}
                  class={styles.right}
                  onClick={this.onNextMonth}
                />
              </div>
            )
            // 'bottom-info': (date: any) => <span>{date.type}</span>
          }}
        />
        <ElDialog
          modelValue={this.show}
          onUpdate:modelValue={e => (this.show = e)}
          class={styles.calenderPopup}
        >
          <div class={styles.popup}>
            <div class={styles.title}>
              <span>{this.selectDayTitle}</span>
            </div>

            <div class={styles.container}>
              {this.dayList.map((item: any) => (
                <div>
                  <Tag
                    round
                    class={[styles.tag, item.checked ? styles.active : '']}
                    size="large"
                    plain
                    onClick={() => this.onSelectDay(item)}
                  >
                    {item.start}～{item.end}
                  </Tag>
                </div>
              ))}
              {this.dayList.length <= 0 && (
                <div class={styles.noDay}>
                  <Image src={IconClock} class={styles.clock} fit="cover" />
                  <span>今日已约满</span>
                </div>
              )}
            </div>

            <div class={[styles.dayBtn, 'flex']}>
              <ElButton
                round
                plain
                style={{ width: '33.33%', marginRight: '10px' }}
                onClick={() => {
                  this.show = false
                  this.selectDays = []
                }}
              >
                取消
              </ElButton>
              <ElButton
                type="primary"
                round
                disabled={!(this.selectDays.length > 0)}
                onClick={() => {
                  this.selectDay && this.selectDay(this.selectDays)
                  this.show = false
                }}
              >
                确认
              </ElButton>
            </div>
          </div>
        </ElDialog>
        {/* <Popup show={this.show} class={styles.calenderPopup}>
          <div class={styles.popup}>
            <div class={styles.title}>
              <span>{this.selectDayTitle}</span>
            </div>

            <div class={styles.container}>
              {this.dayList.map((item: any) => (
                <div>
                  <Tag
                    round
                    class={[styles.tag, item.checked ? styles.active : '']}
                    size="large"
                    plain
                    onClick={() => this.onSelectDay(item)}
                  >
                    {item.start}～{item.end}
                  </Tag>
                </div>
              ))}
              {this.dayList.length <= 0 && (
                <div class={styles.noDay}>
                  <Image src={IconClock} class={styles.clock} fit="cover" />
                  <span>今日已约满</span>
                </div>
              )}
            </div>

            <div class={styles.dayBtn}>
              <Button
                round
                plain
                style={{ width: '33.33%', marginRight: '10px' }}
                onClick={() => {
                  this.show = false
                  this.selectDays = []
                }}
              >
                取消
              </Button>
              <Button
                type="primary"
                block
                round
                disabled={!(this.selectDays.length > 0)}
                onClick={() => {
                  this.selectDay && this.selectDay(this.selectDays)
                  this.show = false
                }}
              >
                确认
              </Button>
            </div>
          </div>
        </Popup> */}
      </>
    )
  }
})