// Styles
import './VCalendarCategory.sass'

// Types
import { VNode } from 'vue'

// Mixins
import VCalendarDaily from './VCalendarDaily'

// Util
import { getSlot } from '../../util/helpers'
import { CalendarTimestamp } from 'types'
import props from './util/props'

/* @vue/component */
export default VCalendarDaily.extend({
  name: 'v-calendar-category',

  props: props.category,

  computed: {
    classes (): object {
      return {
        'v-calendar-daily': true,
        'v-calendar-category': true,
        ...this.themeClasses,
      }
    },
    parsedCategories (): string[] {
      return typeof this.categories === 'string' && this.categories
        ? this.categories.split(/\s*,\s*/)
        : Array.isArray(this.categories)
          ? this.categories as string[]
          : []
    },
  },

  methods: {
    genDayHeader (day: CalendarTimestamp, index: number): VNode[] {
      const data = {
        staticClass: 'v-calendar-category__columns',
      }
      const scope = {
        week: this.days, ...day, index,
      }

      const children = this.parsedCategories.map(category => this.genDayHeaderCategory(day, this.getCategoryScope(scope, category)))

      return [this.$createElement('div', data, children)]
    },
    getCategoryScope (scope: any, category: string) {
      return {
        ...scope,
        category: category === this.categoryForInvalid ? null : category,
      }
    },
    genDayHeaderCategory (day: CalendarTimestamp, scope: any): VNode {
      return this.$createElement('div', {
        staticClass: 'v-calendar-category__column-header',
        on: this.getDefaultMouseEventHandlers(':day-category', e => {
          return this.getCategoryScope(this.getSlotScope(day), scope.category)
        }),
      }, [
        getSlot(this, 'category', scope) || this.genDayHeaderCategoryTitle(scope.category),
        getSlot(this, 'day-header', scope),
      ])
    },
    genDayHeaderCategoryTitle (category: string) {
      return this.$createElement('div', {
        staticClass: 'v-calendar-category__category',
      }, category === null ? this.categoryForInvalid : category)
    },
    genDayBody (day: CalendarTimestamp): VNode[] {
      const data = {
        staticClass: 'v-calendar-category__columns',
      }

      const children = this.parsedCategories.map(category => this.genDayBodyCategory(day, category))

      return [this.$createElement('div', data, children)]
    },
    genDayBodyCategory (day: CalendarTimestamp, category: string): VNode {
      const data = {
        staticClass: 'v-calendar-category__column',
        on: this.getDefaultMouseEventHandlers(':time-category', e => {
          return this.getCategoryScope(this.getSlotScope(this.getTimestampAtEvent(e, day)), category)
        }),
      }

      const children = getSlot(this, 'day-body', () => this.getCategoryScope(this.getSlotScope(day), category))

      return this.$createElement('div', data, children)
    },
  },
})