import type { VueNode } from '../../../_util/type'
import { useInjectRange } from '../../RangeContext'
import type { GenerateConfig } from '../../generate'
import useCellClassName from '../../hooks/useCellClassName'
import useMergeProps from '../../hooks/useMergeProps'
import type { Locale } from '../../interface'
import {
  WEEK_DAY_COUNT,
  formatValue,
  getWeekStartDate,
  isSameDate,
  isSameMonth,
} from '../../utils/dateUtil'
import PanelBody from '../PanelBody'

export type DateRender<DateType> = (props: { current: DateType; today: DateType }) => VueNode

export interface DateBodyPassProps<DateType> {
  dateRender?: DateRender<DateType>
  disabledDate?: (date: DateType) => boolean

  // Used for week panel
  prefixColumn?: (date: DateType) => VueNode
  rowClassName?: (date: DateType) => string
}

export type DateBodyProps<DateType> = {
  prefixCls: string
  generateConfig: GenerateConfig<DateType>
  value?: DateType | null
  viewDate: DateType
  locale: Locale
  rowCount: number
  onSelect: (value: DateType) => void
} & DateBodyPassProps<DateType>

function DateBody<DateType>(_props: DateBodyProps<DateType>) {
  const props = useMergeProps(_props)
  const { prefixCls, generateConfig, prefixColumn, locale, rowCount, viewDate, value, dateRender } =
    props

  const { rangedValue, hoverRangedValue } = useInjectRange()

  const baseDate = getWeekStartDate(locale.locale, generateConfig, viewDate)
  const cellPrefixCls = `${prefixCls}-cell`
  const weekFirstDay = generateConfig.locale.getWeekFirstDay(locale.locale)
  const today = generateConfig.getNow()

  // ============================== Header ==============================
  const headerCells: VueNode[] = []
  const weekDaysLocale: string[] =
    locale.shortWeekDays ||
    (generateConfig.locale.getShortWeekDays
      ? generateConfig.locale.getShortWeekDays(locale.locale)
      : [])

  if (prefixColumn) {
    headerCells.push(<th key="empty" aria-label="empty cell" />)
  }
  for (let i = 0; i < WEEK_DAY_COUNT; i += 1) {
    headerCells.push(<th key={i}>{weekDaysLocale[(i + weekFirstDay) % WEEK_DAY_COUNT]}</th>)
  }

  // =============================== Body ===============================
  const getCellClassName = useCellClassName({
    cellPrefixCls,
    today,
    value,
    generateConfig,
    rangedValue: prefixColumn ? null : rangedValue.value,
    hoverRangedValue: prefixColumn ? null : hoverRangedValue.value,
    isSameCell: (current, target) => isSameDate(generateConfig, current, target),
    isInView: (date) => isSameMonth(generateConfig, date, viewDate),
    offsetCell: (date, offset) => generateConfig.addDate(date, offset),
  })

  const getCellNode = dateRender
    ? (date: DateType) => dateRender({ current: date, today })
    : undefined

  return (
    <PanelBody
      {...props}
      rowNum={rowCount}
      colNum={WEEK_DAY_COUNT}
      baseDate={baseDate}
      getCellNode={getCellNode}
      getCellText={generateConfig.getDate}
      getCellClassName={getCellClassName}
      getCellDate={generateConfig.addDate}
      titleCell={(date) =>
        formatValue(date, {
          locale,
          format: 'YYYY-MM-DD',
          generateConfig,
        })
      }
      headerCells={headerCells}
    />
  )
}

DateBody.displayName = 'DateBody'
DateBody.inheritAttrs = false
DateBody.props = [
  'prefixCls',
  'generateConfig',
  'value?',
  'viewDate',
  'locale',
  'rowCount',
  'onSelect',
  'dateRender?',
  'disabledDate?',
  // Used for week panel
  'prefixColumn?',
  'rowClassName?',
]
export default DateBody
