"use client";

import * as React from "react";
import type { ChainedCommands } from "@tiptap/react";
import { type Editor } from "@tiptap/react";

// --- Lib ---
import { isExtensionAvailable, isNodeTypeSelected } from "@/lib/tiptap-utils";
// --- Hooks ---
import { useTiptapEditor } from "@/hooks/use-tiptap-editor";
// --- Icons ---
import { AlignCenterIcon } from "@/components/shared/tiptap/tiptap-icons/align-center-icon";
import { AlignJustifyIcon } from "@/components/shared/tiptap/tiptap-icons/align-justify-icon";
import { AlignLeftIcon } from "@/components/shared/tiptap/tiptap-icons/align-left-icon";
import { AlignRightIcon } from "@/components/shared/tiptap/tiptap-icons/align-right-icon";

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", "horizontalRule"])
  )
    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 [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]);

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