import { computed, defineComponent, h, provide, reactive, toRef } from 'vue'
import {
  PositionStore,
  Position,
  UpdatePosition,
  GetPositionStore,
  MatchedLine,
  SetMatchedLine
} from './types'
import { IDENTITY } from './utils'

export default defineComponent({
  name: 'DraggableContainer',
  props: {
    disabled: {
      type: Boolean,
      default: false
    },
    adsorbParent: {
      type: Boolean,
      default: true
    },
    adsorbCols: {
      type: Array,
      default: null
    },
    adsorbRows: {
      type: Array,
      default: null
    },
    referenceLineVisible: {
      type: Boolean,
      default: true
    },
    referenceLineColor: {
      type: String,
      default: '#f00'
    }
  },
  setup(props) {
    const positionStore = reactive<PositionStore>({})
    const updatePosition: UpdatePosition = (id: string, position: Position) => {
      positionStore[id] = position
    }
    const getPositionStore: GetPositionStore = (excludeId?: string) => {
      const _positionStore = Object.assign({}, positionStore)
      if (excludeId) {
        delete _positionStore[excludeId]
      }
      return _positionStore
    }
    const state = reactive<{
      matchedLine: MatchedLine | null
    }>({
      matchedLine: null
    })
    const matchedRows = computed(
      () => (state.matchedLine && state.matchedLine.row) || []
    )
    const matchedCols = computed(
      () => (state.matchedLine && state.matchedLine.col) || []
    )
    const setMatchedLine: SetMatchedLine = (
      matchedLine: MatchedLine | null
    ) => {
      state.matchedLine = matchedLine
    }
    provide('identity', IDENTITY)
    provide('updatePosition', updatePosition)
    provide('getPositionStore', getPositionStore)
    provide('setMatchedLine', setMatchedLine)
    provide('disabled', toRef(props, 'disabled'))
    provide('adsorbParent', toRef(props, 'adsorbParent'))
    provide('adsorbCols', props.adsorbCols || [])
    provide('adsorbRows', props.adsorbRows || [])
    return {
      matchedRows,
      matchedCols
    }
  },
  methods: {
    renderReferenceLine() {
      if (!this.referenceLineVisible) {
        return []
      }
      return [
        ...this.matchedCols.map((item) => {
          return h('div', {
            style: {
              width: '0',
              height: '100%',
              top: '0',
              left: item + 'px',
              borderLeft: `1px dashed ${this.referenceLineColor}`,
              position: 'absolute'
            }
          })
        }),
        ...this.matchedRows.map((item) => {
          return h('div', {
            style: {
              width: '100%',
              height: '0',
              left: '0',
              top: item + 'px',
              borderTop: `1px dashed ${this.referenceLineColor}`,
              position: 'absolute'
            }
          })
        })
      ]
    }
  },
  render() {
    return h(
      'div',
      {
        style: { width: '100%', height: '100%', position: 'relative' }
      },
      [
        this.$slots.default && this.$slots.default(),
        ...this.renderReferenceLine()
      ]
    )
  }
})