'use client'

import { NodeSelection, TextSelection } from '@tiptap/pm/state'
import type { Editor } from '@tiptap/react'
import * as React from 'react'
import { useHotkeys } from 'react-hotkeys-hook'
// --- Icons ---
import { ListIcon } from '~/components/tiptap/tiptap-icons/list-icon'
import { ListOrderedIcon } from '~/components/tiptap/tiptap-icons/list-ordered-icon'
import { ListTodoIcon } from '~/components/tiptap/tiptap-icons/list-todo-icon'
// --- Hooks ---
import { useIsMobile } from '~/hooks/use-mobile'
import { useTiptapEditor } from '~/hooks/use-tiptap-editor'

// --- Lib ---
import {
  findNodePosition,
  isNodeInSchema,
  isNodeTypeSelected,
  isValidPosition,
} from '~/utils/tiptap_utils'

export type ListType = 'bulletList' | 'orderedList' | 'taskList'

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

export const listIcons = {
  bulletList: ListIcon,
  orderedList: ListOrderedIcon,
  taskList: ListTodoIcon,
}

export const listLabels: Record<ListType, string> = {
  bulletList: 'Bullet List',
  orderedList: 'Ordered List',
  taskList: 'Task List',
}

export const LIST_SHORTCUT_KEYS: Record<ListType, string> = {
  bulletList: 'mod+shift+8',
  orderedList: 'mod+shift+7',
  taskList: 'mod+shift+9',
}

/**
 * Checks if a list can be toggled in the current editor state
 */
export function canToggleList(
  editor: Editor | null,
  type: ListType,
  turnInto: boolean = true,
): boolean {
  if (!editor || !editor.isEditable) return false
  if (!isNodeInSchema(type, editor) || isNodeTypeSelected(editor, ['image'])) return false

  if (!turnInto) {
    switch (type) {
      case 'bulletList':
        return editor.can().toggleBulletList()
      case 'orderedList':
        return editor.can().toggleOrderedList()
      case 'taskList':
        return editor.can().toggleList('taskList', 'taskItem')
      default:
        return false
    }
  }

  try {
    const view = editor.view
    const state = view.state
    const selection = state.selection

    if (selection.empty || selection instanceof TextSelection) {
      const pos = findNodePosition({
        editor,
        node: state.selection.$anchor.node(1),
      })?.pos
      if (!isValidPosition(pos)) return false
    }

    return true
  } catch {
    return false
  }
}

/**
 * Checks if list is currently active
 */
export function isListActive(editor: Editor | null, type: ListType): boolean {
  if (!editor || !editor.isEditable) return false

  switch (type) {
    case 'bulletList':
      return editor.isActive('bulletList')
    case 'orderedList':
      return editor.isActive('orderedList')
    case 'taskList':
      return editor.isActive('taskList')
    default:
      return false
  }
}

/**
 * Toggles list in the editor
 */
export function toggleList(editor: Editor | null, type: ListType): boolean {
  if (!editor || !editor.isEditable) return false
  if (!canToggleList(editor, type)) return false

  try {
    const view = editor.view
    let state = view.state
    let tr = state.tr

    // No selection, find the the cursor position
    if (state.selection.empty || state.selection instanceof TextSelection) {
      const pos = findNodePosition({
        editor,
        node: state.selection.$anchor.node(1),
      })?.pos
      if (!isValidPosition(pos)) return false

      tr = tr.setSelection(NodeSelection.create(state.doc, pos))
      view.dispatch(tr)
      state = view.state
    }

    const selection = state.selection

    let chain = editor.chain().focus()

    // Handle NodeSelection
    if (selection instanceof NodeSelection) {
      const firstChild = selection.node.firstChild?.firstChild
      const lastChild = selection.node.lastChild?.lastChild

      const from = firstChild ? selection.from + firstChild.nodeSize : selection.from + 1

      const to = lastChild ? selection.to - lastChild.nodeSize : selection.to - 1

      chain = chain.setTextSelection({ from, to }).clearNodes()
    }

    if (editor.isActive(type)) {
      // Unwrap list
      chain.liftListItem('listItem').lift('bulletList').lift('orderedList').lift('taskList').run()
    } else {
      // Wrap in specific list type
      const toggleMap: Record<ListType, () => typeof chain> = {
        bulletList: () => chain.toggleBulletList(),
        orderedList: () => chain.toggleOrderedList(),
        taskList: () => chain.toggleList('taskList', 'taskItem'),
      }

      const toggle = toggleMap[type]
      if (!toggle) return false

      toggle().run()
    }

    editor.chain().focus().selectTextblockEnd().run()

    return true
  } catch {
    return false
  }
}

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

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

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

  return true
}

/**
 * Custom hook that provides list functionality for Tiptap editor
 *
 * @example
 * ```tsx
 * // Simple usage
 * function MySimpleListButton() {
 *   const { isVisible, handleToggle, isActive } = useList({ type: "bulletList" })
 *
 *   if (!isVisible) return null
 *
 *   return <button onClick={handleToggle}>Bullet List</button>
 * }
 *
 * // Advanced usage with configuration
 * function MyAdvancedListButton() {
 *   const { isVisible, handleToggle, label, isActive } = useList({
 *     type: "orderedList",
 *     editor: myEditor,
 *     hideWhenUnavailable: true,
 *     onToggled: () => console.log('List toggled!')
 *   })
 *
 *   if (!isVisible) return null
 *
 *   return (
 *     <MyButton
 *       onClick={handleToggle}
 *       aria-label={label}
 *       aria-pressed={isActive}
 *     >
 *       Toggle List
 *     </MyButton>
 *   )
 * }
 * ```
 */
export function useList(config: UseListConfig) {
  const { editor: providedEditor, type, hideWhenUnavailable = false, onToggled } = config

  const { editor } = useTiptapEditor(providedEditor)
  const isMobile = useIsMobile()
  const [isVisible, setIsVisible] = React.useState<boolean>(true)
  const canToggle = canToggleList(editor, type)
  const isActive = isListActive(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 handleToggle = React.useCallback(() => {
    if (!editor) return false

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

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

  return {
    isVisible,
    isActive,
    handleToggle,
    canToggle,
    label: listLabels[type],
    shortcutKeys: LIST_SHORTCUT_KEYS[type],
    Icon: listIcons[type],
  }
}