import { useCallback, type ReactNode } from 'react';
import type { DiffLineAnnotation } from '@pierre/diffs';
import type { DiffComment } from '@/lib/diff/types';
import { CommentForm } from './comment-form';
import { CommentDisplay } from './comment-display';
import { HunkActionBar } from './hunk-action-bar';

type AnnotationMetadata = {
  type: 'comment' | 'new-comment-form' | 'hunk-actions';
  comment?: DiffComment;
  isEditing?: boolean;
  changeBlockId?: string;
};

type UseAnnotationRendererOpts = {
  handleRevertBlock: (changeBlockId: string) => Promise<void>;
  onButtonEnter: () => void;
  onButtonLeave: () => void;
  handleCommentSubmit: (content: string) => void;
  handleCommentUpdate: (commentId: string, content: string) => void;
  handleCommentDelete: (commentId: string) => void;
  setShowCommentForm: (show: boolean) => void;
  setSelectedLines: (lines: null) => void;
  setEditingComment: (id: string | null) => void;
};

export type { AnnotationMetadata };

export function useAnnotationRenderer(opts: UseAnnotationRendererOpts) {
  const {
    handleRevertBlock, onButtonEnter, onButtonLeave,
    handleCommentSubmit, handleCommentUpdate, handleCommentDelete,
    setShowCommentForm, setSelectedLines, setEditingComment,
  } = opts;

  return useCallback(
    (annotation: DiffLineAnnotation<AnnotationMetadata>): ReactNode => {
      const { type, comment, isEditing, changeBlockId } = annotation.metadata;

      if (type === 'hunk-actions' && changeBlockId) {
        return (
          <HunkActionBar
            key={changeBlockId}
            changeBlockId={changeBlockId}
            onRevert={() => handleRevertBlock(changeBlockId)}
            onMouseEnter={onButtonEnter}
            onMouseLeave={onButtonLeave}
          />
        );
      }

      if (type === 'new-comment-form') {
        return (
          <div className="my-1 px-2">
            <CommentForm
              onSubmit={handleCommentSubmit}
              onCancel={() => {
                setShowCommentForm(false);
                setSelectedLines(null);
              }}
            />
          </div>
        );
      }

      if (isEditing && comment) {
        return (
          <div className="my-1 px-2">
            <CommentForm
              initialContent={comment.text}
              onSubmit={(content) => handleCommentUpdate(comment.id, content)}
              onCancel={() => setEditingComment(null)}
              isEditing
            />
          </div>
        );
      }

      if (comment) {
        return (
          <div className="my-1 px-2">
            <CommentDisplay
              comment={comment}
              onDelete={() => handleCommentDelete(comment.id)}
              onEdit={() => setEditingComment(comment.id)}
              showCode={false}
            />
          </div>
        );
      }

      return null;
    },
    [setEditingComment, handleCommentDelete, handleCommentUpdate, handleCommentSubmit, handleRevertBlock, onButtonEnter, onButtonLeave, setShowCommentForm, setSelectedLines]
  );
}