/** 历史兼容别名 → ElPopconfirm 标准属性 */
const POP_LEGACY_MAP = {
  popTitle: 'title',
  popPlacement: 'placement'
} as const

/** 按钮侧保留的属性 key */
const BUTTON_PROP_KEYS = [
  'type',
  'size',
  'disabled',
  'danger',
  'showDisabled',
  'icon',
  'loading',
  'plain',
  'link',
  'round',
  'circle',
  'square',
  'map',
  'buttonType',
  'text'
]

/** ElPopconfirm 可透传属性 */
const POP_PROP_KEYS = [
  'title',
  'placement',
  'width',
  'icon',
  'iconColor',
  'hideIcon',
  'confirmButtonText',
  'cancelButtonText',
  'confirmButtonType',
  'cancelButtonType',
  'teleported',
  'persistent',
  'effect',
  'trigger',
  'popperClass',
  'popperStyle'
]

/** rich pop（ElPopover）可透传属性 */
const POPOVER_PROP_KEYS = [
  'placement',
  'width',
  'teleported',
  'persistent',
  'effect',
  'trigger',
  'popperClass',
  'popperStyle'
]

const POP_RESERVED_KEYS = new Set([
  'needPop',
  'popTitle',
  'popMessage',
  'popPlacement',
  'popProps',
  'popLegacyCancel',
  'buttonComp'
])

function pick (source: Record<string, any>, keys: string[]) {
  return keys.reduce((acc, key) => {
    if (source[key] !== undefined) {
      acc[key] = source[key]
    }
    return acc
  }, {} as Record<string, any>)
}

function mapLegacy (source: Record<string, any>) {
  return Object.entries(POP_LEGACY_MAP).reduce((acc, [legacyKey, epKey]) => {
    if (source[legacyKey] !== undefined) {
      acc[epKey] = source[legacyKey]
    }
    return acc
  }, {} as Record<string, any>)
}

/** 从 popXxx 前缀属性提取 ElPopconfirm 属性，如 popConfirmButtonText → confirmButtonText */
function extractPopPrefixedAttrs (source: Record<string, any>) {
  return Object.entries(source).reduce((acc, [key, value]) => {
    if (
      key.startsWith('pop') &&
      key.length > 3 &&
      !POP_RESERVED_KEYS.has(key) &&
      value !== undefined
    ) {
      acc[key.charAt(3).toLowerCase() + key.slice(4)] = value
    }
    return acc
  }, {} as Record<string, any>)
}

export interface PopSlotScope {
  title?: string
  message?: string
  confirm?: (e?: MouseEvent) => void
  cancel?: (e?: MouseEvent) => void
}

export function useButtonPop (
  props: Record<string, any>,
  attrs: Record<string, any>,
  slots: Record<string, any>
) {
  const merged = { ...props, ...attrs }
  const needPop = merged.needPop !== false
  const { onClick, onCancel, ...rest } = attrs as {
    onClick?: (e?: MouseEvent, confirmed?: boolean) => void
    onCancel?: (e?: MouseEvent) => void
    [key: string]: any
  }

  const buttonProps = pick(merged, BUTTON_PROP_KEYS)

  const popProps = {
    title: '确定删除该信息',
    cancelButtonType: 'default',
    placement: 'top',
    width: 280,
    ...pick(rest, POP_PROP_KEYS),
    ...extractPopPrefixedAttrs(rest),
    ...mapLegacy(props),
    ...mapLegacy(attrs as Record<string, any>),
    ...(props.popProps ?? attrs.popProps)
  }
  delete popProps.hideAfter

  const legacyTitle = props.popTitle ?? attrs.popTitle
  const resolvedMessage = props.popMessage ?? attrs.popMessage
  const resolvedTitle = legacyTitle ?? (resolvedMessage ? undefined : popProps.title)

  const hasReferenceSlot = Boolean(slots.reference || slots.button)
  const hasRichPop = Boolean(
    resolvedMessage ||
    slots['pop-title'] ||
    slots['pop-message'] ||
    slots.pop ||
    (hasReferenceSlot && slots.default)
  )

  const popLegacyCancel = props.popLegacyCancel ?? attrs.popLegacyCancel ?? true
  const popoverProps = pick(popProps, POPOVER_PROP_KEYS)

  return {
    needPop,
    buttonProps,
    popProps,
    popoverProps,
    resolvedTitle,
    resolvedMessage,
    hasRichPop,
    hasReferenceSlot,
    onClick,
    onCancel,
    popLegacyCancel
  }
}