'use client'

import type { ChainedCommands, Editor } from '@tiptap/react'
import * as React from 'react'
import { useHotkeys } from 'react-hotkeys-hook'
// --- Icons ---
import { AlignCenterIcon } from '~/components/tiptap/tiptap-icons/align-center-icon'
import { AlignJustifyIcon } from '~/components/tiptap/tiptap-icons/align-justify-icon'
import { AlignLeftIcon } from '~/components/tiptap/tiptap-icons/align-left-icon'
import { AlignRightIcon } from '~/components/tiptap/tiptap-icons/align-right-icon'
// --- Hooks ---
import { useIsMobile } from '~/hooks/use-mobile'
import { useTiptapEditor } from '~/hooks/use-tiptap-editor'
// --- Lib ---
import { isExtensionAvailable, isNodeTypeSelected } from '~/utils/tiptap_utils'

export type TextAlign = 'left' | 'center' | 'right' | 'justify'

/**
 * Configuration for the text align functionality
 */
export interface UseTextAlignConfig {
  /**
   * The Tiptap editor instance.
   */
  editor?: Editor | null
  /**
   * The text alignment to apply.
   */
  align: TextAlign
  /**
   * Whether the button should hide when alignment is not available.
   * @default false
   */
  hideWhenUnavailable?: boolean
  /**
   * Callback function called after a successful alignment change.
   */
  onAligned?: () => void
}

export const TEXT_ALIGN_SHORTCUT_KEYS: Record<TextAlign, string> = {
  left: 'mod+shift+l',
  center: 'mod+shift+e',
  right: 'mod+shift+r',
  justify: 'mod+shift+j',
}

export const textAlignIcons = {
  left: AlignLeftIcon,
  center: AlignCenterIcon,
  right: AlignRightIcon,
  justify: AlignJustifyIcon,
}

export const textAlignLabels: Record<TextAlign, string> = {
  left: 'Align left',
  center: 'Align center',
  right: 'Align right',
  justify: 'Align justify',
}

/**
 * Checks if text alignment can be performed in the current editor state
 */
export function canSetTextAlign(editor: Editor | null, align: TextAlign): boolean {
  if (!editor || !editor.isEditable) return false
  if (!isExtensionAvailable(editor, 'textAlign') || isNodeTypeSelected(editor, ['image']))
    return false

  return editor.can().setTextAlign(align)
}

export function hasSetTextAlign(commands: ChainedCommands): commands is ChainedCommands & {
  setTextAlign: (align: TextAlign) => ChainedCommands
} {
  return 'setTextAlign' in commands
}

/**
 * Checks if the text alignment is currently active
 */
export function isTextAlignActive(editor: Editor | null, align: TextAlign): boolean {
  if (!editor || !editor.isEditable) return false
  return editor.isActive({ textAlign: align })
}

/**
 * Sets text alignment in the editor
 */
export function setTextAlign(editor: Editor | null, align: TextAlign): boolean {
  if (!editor || !editor.isEditable) return false
  if (!canSetTextAlign(editor, align)) return false

  const chain = editor.chain().focus()
  if (hasSetTextAlign(chain)) {
    return chain.setTextAlign(align).run()
  }

  return false
}

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

  if (!editor || !editor.isEditable) return false
  if (!isExtensionAvailable(editor, 'textAlign')) return false

  if (hideWhenUnavailable && !editor.isActive('code')) {
    return canSetTextAlign(editor, align)
  }

  return true
}

/**
 * Custom hook that provides text align functionality for Tiptap editor
 *
 * @example
 * ```tsx
 * // Simple usage
 * function MySimpleAlignButton() {
 *   const { isVisible, handleTextAlign } = useTextAlign({ align: "center" })
 *
 *   if (!isVisible) return null
 *
 *   return <button onClick={handleTextAlign}>Align Center</button>
 * }
 *
 * // Advanced usage with configuration
 * function MyAdvancedAlignButton() {
 *   const { isVisible, handleTextAlign, label, isActive } = useTextAlign({
 *     editor: myEditor,
 *     align: "right",
 *     hideWhenUnavailable: true,
 *     onAligned: () => console.log('Text aligned!')
 *   })
 *
 *   if (!isVisible) return null
 *
 *   return (
 *     <MyButton
 *       onClick={handleTextAlign}
 *       aria-pressed={isActive}
 *       aria-label={label}
 *     >
 *       Align Right
 *     </MyButton>
 *   )
 * }
 * ```
 */
export function useTextAlign(config: UseTextAlignConfig) {
  const { editor: providedEditor, align, hideWhenUnavailable = false, onAligned } = config

  const { editor } = useTiptapEditor(providedEditor)
  const isMobile = useIsMobile()
  const [isVisible, setIsVisible] = React.useState<boolean>(true)
  const canAlign = canSetTextAlign(editor, align)
  const isActive = isTextAlignActive(editor, align)

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

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

    handleSelectionUpdate()

    editor.on('selectionUpdate', handleSelectionUpdate)

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

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

    const success = setTextAlign(editor, align)
    if (success) {
      onAligned?.()
    }
    return success
  }, [editor, align, onAligned])

  useHotkeys(
    TEXT_ALIGN_SHORTCUT_KEYS[align],
    (event) => {
      event.preventDefault()
      handleTextAlign()
    },
    {
      enabled: isVisible && canAlign,
      enableOnContentEditable: !isMobile,
      enableOnFormTags: true,
    },
  )

  return {
    isVisible,
    isActive,
    handleTextAlign,
    canAlign,
    label: textAlignLabels[align],
    shortcutKeys: TEXT_ALIGN_SHORTCUT_KEYS[align],
    Icon: textAlignIcons[align],
  }
}