'use client'

import type { Editor } from '@tiptap/react'
import * as React from 'react'
import { useHotkeys } from 'react-hotkeys-hook'
// --- Icons ---
import { BoldIcon } from '~/components/tiptap/tiptap-icons/bold-icon'
import { Code2Icon } from '~/components/tiptap/tiptap-icons/code2-icon'
import { ItalicIcon } from '~/components/tiptap/tiptap-icons/italic-icon'
import { StrikeIcon } from '~/components/tiptap/tiptap-icons/strike-icon'
import { SubscriptIcon } from '~/components/tiptap/tiptap-icons/subscript-icon'
import { SuperscriptIcon } from '~/components/tiptap/tiptap-icons/superscript-icon'
import { UnderlineIcon } from '~/components/tiptap/tiptap-icons/underline-icon'
// --- Hooks ---
import { useIsMobile } from '~/hooks/use-mobile'
import { useTiptapEditor } from '~/hooks/use-tiptap-editor'
// --- Lib ---
import { isMarkInSchema, isNodeTypeSelected } from '~/utils/tiptap_utils'

export type Mark = 'bold' | 'italic' | 'strike' | 'code' | 'underline' | 'superscript' | 'subscript'

/**
 * Configuration for the mark functionality
 */
export interface UseMarkConfig {
  /**
   * The Tiptap editor instance.
   */
  editor?: Editor | null
  /**
   * The type of mark to toggle
   */
  type: Mark
  /**
   * Whether the button should hide when mark is not available.
   * @default false
   */
  hideWhenUnavailable?: boolean
  /**
   * Callback function called after a successful mark toggle.
   */
  onToggled?: () => void
}

export const markIcons = {
  bold: BoldIcon,
  italic: ItalicIcon,
  underline: UnderlineIcon,
  strike: StrikeIcon,
  code: Code2Icon,
  superscript: SuperscriptIcon,
  subscript: SubscriptIcon,
}

export const MARK_SHORTCUT_KEYS: Record<Mark, string> = {
  bold: 'mod+b',
  italic: 'mod+i',
  underline: 'mod+u',
  strike: 'mod+shift+s',
  code: 'mod+e',
  superscript: 'mod+.',
  subscript: 'mod+,',
}

/**
 * Checks if a mark can be toggled in the current editor state
 */
export function canToggleMark(editor: Editor | null, type: Mark): boolean {
  if (!editor || !editor.isEditable) return false
  if (!isMarkInSchema(type, editor) || isNodeTypeSelected(editor, ['image'])) return false

  return editor.can().toggleMark(type)
}

/**
 * Checks if a mark is currently active
 */
export function isMarkActive(editor: Editor | null, type: Mark): boolean {
  if (!editor || !editor.isEditable) return false
  return editor.isActive(type)
}

/**
 * Toggles a mark in the editor
 */
export function toggleMark(editor: Editor | null, type: Mark): boolean {
  if (!editor || !editor.isEditable) return false
  if (!canToggleMark(editor, type)) return false

  return editor.chain().focus().toggleMark(type).run()
}

/**
 * Determines if the mark button should be shown
 */
export function shouldShowButton(props: {
  editor: Editor | null
  type: Mark
  hideWhenUnavailable: boolean
}): boolean {
  const { editor, type, hideWhenUnavailable } = props

  if (!editor || !editor.isEditable) return false
  if (!isMarkInSchema(type, editor)) return false

  if (hideWhenUnavailable && !editor.isActive('code')) {
    return canToggleMark(editor, type)
  }

  return true
}

/**
 * Gets the formatted mark name
 */
export function getFormattedMarkName(type: Mark): string {
  return type.charAt(0).toUpperCase() + type.slice(1)
}

/**
 * Custom hook that provides mark functionality for Tiptap editor
 *
 * @example
 * ```tsx
 * // Simple usage
 * function MySimpleBoldButton() {
 *   const { isVisible, handleMark } = useMark({ type: "bold" })
 *
 *   if (!isVisible) return null
 *
 *   return <button onClick={handleMark}>Bold</button>
 * }
 *
 * // Advanced usage with configuration
 * function MyAdvancedItalicButton() {
 *   const { isVisible, handleMark, label, isActive } = useMark({
 *     editor: myEditor,
 *     type: "italic",
 *     hideWhenUnavailable: true,
 *     onToggled: () => console.log('Mark toggled!')
 *   })
 *
 *   if (!isVisible) return null
 *
 *   return (
 *     <MyButton
 *       onClick={handleMark}
 *       aria-pressed={isActive}
 *       aria-label={label}
 *     >
 *       Italic
 *     </MyButton>
 *   )
 * }
 * ```
 */
export function useMark(config: UseMarkConfig) {
  const { editor: providedEditor, type, hideWhenUnavailable = false, onToggled } = config

  const { editor } = useTiptapEditor(providedEditor)
  const isMobile = useIsMobile()
  const [isVisible, setIsVisible] = React.useState<boolean>(true)
  const canToggle = canToggleMark(editor, type)
  const isActive = isMarkActive(editor, type)

  React.useEffect(() => {
    if (!editor) return

    const handleSelectionUpdate = () => {
      setIsVisible(shouldShowButton({ editor, type, hideWhenUnavailable }))
    }

    handleSelectionUpdate()

    editor.on('selectionUpdate', handleSelectionUpdate)

    return () => {
      editor.off('selectionUpdate', handleSelectionUpdate)
    }
  }, [editor, type, hideWhenUnavailable])

  const handleMark = React.useCallback(() => {
    if (!editor) return false

    const success = toggleMark(editor, type)
    if (success) {
      onToggled?.()
    }
    return success
  }, [editor, type, onToggled])

  useHotkeys(
    MARK_SHORTCUT_KEYS[type],
    (event) => {
      event.preventDefault()
      handleMark()
    },
    {
      enabled: isVisible && canToggle,
      enableOnContentEditable: !isMobile,
      enableOnFormTags: true,
    },
  )

  return {
    isVisible,
    isActive,
    handleMark,
    canToggle,
    label: getFormattedMarkName(type),
    shortcutKeys: MARK_SHORTCUT_KEYS[type],
    Icon: markIcons[type],
  }
}