/* eslint-disable import/prefer-default-export */
import type { CSSInterpolation, CSSObject } from '@antd-tiny-vue/cssinjs'
import type { DerivativeToken, FullToken } from '../theme/internal'
import type { OverrideComponent } from '../theme/util/genComponentStyleHook'

interface CompactItemOptions {
  focus?: boolean
  /**
   * Some component borders are implemented on child elements
   * like `Select`
   */
  borderElCls?: string
  /**
   * Some components have special `focus` className especially with popovers
   * like `Select` and `DatePicker`
   */
  focusElCls?: string
}

// handle border collapse
function compactItemBorder(token: DerivativeToken, parentCls: string, options: CompactItemOptions): CSSObject {
  const { focusElCls, focus, borderElCls } = options
  const childCombinator = borderElCls ? '> *' : ''
  const hoverEffects = ['hover', focus ? 'focus' : null, 'active']
    .filter(Boolean)
    .map(n => `&:${n} ${childCombinator}`)
    .join(',')
  return {
    [`&-item:not(${parentCls}-last-item)`]: {
      marginInlineEnd: -token.lineWidth
    },

    '&-item': {
      [hoverEffects]: {
        zIndex: 2
      },

      ...(focusElCls
        ? {
            [`&${focusElCls}`]: {
              zIndex: 2
            }
          }
        : {}),

      [`&[disabled] ${childCombinator}`]: {
        zIndex: 0
      }
    }
  }
}

// handle border-radius
function compactItemBorderRadius(prefixCls: string, parentCls: string, options: CompactItemOptions): CSSObject {
  const { borderElCls } = options
  const childCombinator = borderElCls ? `> ${borderElCls}` : ''

  return {
    [`&-item:not(${parentCls}-first-item):not(${parentCls}-last-item) ${childCombinator}`]: {
      borderRadius: 0
    },

    [`&-item:not(${parentCls}-last-item)${parentCls}-first-item`]: {
      [`& ${childCombinator}, &${prefixCls}-sm ${childCombinator}, &${prefixCls}-lg ${childCombinator}`]: {
        borderStartEndRadius: 0,
        borderEndEndRadius: 0
      }
    },

    [`&-item:not(${parentCls}-first-item)${parentCls}-last-item`]: {
      [`& ${childCombinator}, &${prefixCls}-sm ${childCombinator}, &${prefixCls}-lg ${childCombinator}`]: {
        borderStartStartRadius: 0,
        borderEndStartRadius: 0
      }
    }
  }
}

export function genCompactItemStyle<T extends OverrideComponent>(token: FullToken<T>, options: CompactItemOptions = { focus: true }): CSSInterpolation {
  const { componentCls } = token

  const compactCls = `${componentCls}-compact`

  return {
    [compactCls]: {
      ...compactItemBorder(token, compactCls, options),
      ...compactItemBorderRadius(componentCls, compactCls, options)
    }
  }
}