// component.js
import { ComponentWithComputed } from 'miniprogram-computed'

ComponentWithComputed({

  options: {
    styleIsolation: 'apply-shared'
  },

  properties: {
    paging: Object,
    g_cdn: String
  },

  data: {

  },

  watch:{
    'paging.current':function (val) {
      this.triggerEvent('changeCurrent', val)
    }
  },

  computed: {
    min() {
      return 1
    },
    max(data) {
      return Math.ceil(data.paging.total / data.paging.pageSize)
    },
    routineMin(data) {
      return data.paging.current - Math.ceil(data.paging.showSize / 2)
    },
    routineMax(data) {
      return data.paging.current + Math.floor(data.paging.showSize / 2)
    },
    currMin(data: any) {
      let c = data.max - data.routineMax
      if (data.routineMin <= data.min) {
        return data.min
      } else if (c >= 0) {
        return data.routineMin
      } else if (data.routineMin + c <= data.min) {
        return data.min
      } else {
        return data.routineMin + c
      }
    },
    currMax(data: any) {
      let c = data.min - data.routineMin

      if (data.routineMax >= data.max) {
        return data.max
      } else if (c <= 0) {
        return data.routineMax
      } else if (data.routineMax + c >= data.max) {
        return data.max
      } else {
        return data.routineMax + c
      }
    },
    numbers(data: any) {
      let total = data.currMax - data.currMin
      let numbers = []

      if (total <= 0) {
        numbers.push(1)
      } else {
        for (let i = 0; i <= total; i++) {
          numbers.push(data.currMin + i)
        }
      }


      return numbers
    }
  },





  methods: {
    onTap(e: any) {
      let { idx } = e.currentTarget.dataset;
      this.setData({
        'paging.current': idx
      })

    },
    prev() {
      if (this.properties.paging.current - 1 < this.data.min) {
        return
      }
      this.setData({
        'paging.current': this.properties.paging.current - 1
      })
    },
    next() {
      if (this.properties.paging.current + 1 > this.data.max) {
        return
      }
      this.setData({
        'paging.current': this.properties.paging.current + 1
      })
    },
  }
})