'use client'

import type { Editor } from '@tiptap/react'
import * as React from 'react'
import { useHotkeys } from 'react-hotkeys-hook'
// --- Icons ---
import { ImagePlusIcon } from '~/components/tiptap/tiptap-icons/image-plus-icon'
// --- Hooks ---
import { useIsMobile } from '~/hooks/use-mobile'
import { useTiptapEditor } from '~/hooks/use-tiptap-editor'
// --- Lib ---
import { isExtensionAvailable, isNodeTypeSelected } from '~/utils/tiptap_utils'

export const IMAGE_UPLOAD_SHORTCUT_KEY = 'mod+shift+i'

/**
 * Configuration for the image upload functionality
 */
export interface UseImageUploadConfig {
  /**
   * The Tiptap editor instance.
   */
  editor?: Editor | null
  /**
   * Whether the button should hide when insertion is not available.
   * @default false
   */
  hideWhenUnavailable?: boolean
  /**
   * Callback function called after a successful image insertion.
   */
  onInserted?: () => void
}

/**
 * Checks if image can be inserted in the current editor state
 */
export function canInsertImage(editor: Editor | null): boolean {
  if (!editor || !editor.isEditable) return false
  if (!isExtensionAvailable(editor, 'imageUpload') || isNodeTypeSelected(editor, ['image']))
    return false

  return editor.can().insertContent({ type: 'imageUpload' })
}

/**
 * Checks if image is currently active
 */
export function isImageActive(editor: Editor | null): boolean {
  if (!editor || !editor.isEditable) return false
  return editor.isActive('imageUpload')
}

/**
 * Inserts an image in the editor
 */
export function insertImage(editor: Editor | null): boolean {
  if (!editor || !editor.isEditable) return false
  if (!canInsertImage(editor)) return false

  try {
    return editor
      .chain()
      .focus()
      .insertContent({
        type: 'imageUpload',
      })
      .run()
  } catch {
    return false
  }
}

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

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

  if (hideWhenUnavailable && !editor.isActive('code')) {
    return canInsertImage(editor)
  }

  return true
}

/**
 * Custom hook that provides image functionality for Tiptap editor
 *
 * @example
 * ```tsx
 * // Simple usage - no params needed
 * function MySimpleImageButton() {
 *   const { isVisible, handleImage } = useImage()
 *
 *   if (!isVisible) return null
 *
 *   return <button onClick={handleImage}>Add Image</button>
 * }
 *
 * // Advanced usage with configuration
 * function MyAdvancedImageButton() {
 *   const { isVisible, handleImage, label, isActive } = useImage({
 *     editor: myEditor,
 *     hideWhenUnavailable: true,
 *     onInserted: () => console.log('Image inserted!')
 *   })
 *
 *   if (!isVisible) return null
 *
 *   return (
 *     <MyButton
 *       onClick={handleImage}
 *       aria-pressed={isActive}
 *       aria-label={label}
 *     >
 *       Add Image
 *     </MyButton>
 *   )
 * }
 * ```
 */
export function useImageUpload(config?: UseImageUploadConfig) {
  const { editor: providedEditor, hideWhenUnavailable = false, onInserted } = config || {}

  const { editor } = useTiptapEditor(providedEditor)
  const isMobile = useIsMobile()
  const [isVisible, setIsVisible] = React.useState<boolean>(true)
  const canInsert = canInsertImage(editor)
  const isActive = isImageActive(editor)

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

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

    handleSelectionUpdate()

    editor.on('selectionUpdate', handleSelectionUpdate)

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

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

    const success = insertImage(editor)
    if (success) {
      onInserted?.()
    }
    return success
  }, [editor, onInserted])

  useHotkeys(
    IMAGE_UPLOAD_SHORTCUT_KEY,
    (event) => {
      event.preventDefault()
      handleImage()
    },
    {
      enabled: isVisible && canInsert,
      enableOnContentEditable: !isMobile,
      enableOnFormTags: true,
    },
  )

  return {
    isVisible,
    isActive,
    handleImage,
    canInsert,
    label: 'Add image',
    shortcutKeys: IMAGE_UPLOAD_SHORTCUT_KEY,
    Icon: ImagePlusIcon,
  }
}