import { useParams, Link, useNavigate } from 'react-router-dom';
import { WidePageLayout } from '../components/WidePageLayout';
import RichTextContent from '../components/RichTextContent';
import useWikiDetail from '../hooks/useWikiDetail';
import Edit2Icon from '../components/icons/Edit2Icon';
import Trash2Icon from '../components/icons/Trash2Icon';
import ChevronRightIcon from '../components/icons/ChevronRightIcon';

export function WikiDetail() {
  const { id: boardId, wikiId } = useParams<{ id: string; wikiId: string }>();
  const navigate = useNavigate();
  const { wiki, deleteWiki } = useWikiDetail(wikiId || '0');

  const handleDelete = async () => {
    if (!wiki) return;

    if (confirm(`Are you sure you want to delete wiki "${wiki.name}"?`)) {
      try {
        await deleteWiki();
        navigate(`/boards/${boardId}/wikis`);
      } catch {
        // Error is already handled by hook with toast
      }
    }
  };

  if (!wiki) {
    return (
      <div className="space-y-6">
        <WidePageLayout>
          <div className="text-center py-12">
            <div className="text-gray-400">Loading wiki...</div>
          </div>
        </WidePageLayout>
      </div>
    );
  }

  return (
    <div className="space-y-6">
      {/* Header */}
      <WidePageLayout>
        <div>
          <Link
            to={`/boards/${boardId}/wikis`}
            className="text-gray-400 hover:text-white transition-colors text-sm"
          >
            ← Back to Wikis
          </Link>
          <div className="flex items-center justify-between mt-2">
            <div>
              <h1 className="text-3xl font-bold text-white">{wiki.name}</h1>
              {wiki.slug && <span className="text-gray-400 text-sm">/{wiki.slug}</span>}
            </div>
            <div className="flex gap-2">
              <Link
                to={`/boards/${boardId}/wikis/${wiki.id}/edit`}
                className="bg-gray-700 hover:bg-gray-600 text-white px-4 py-2 rounded-lg flex items-center gap-2 transition-colors"
              >
                <span className="w-4 h-4">
                  <Edit2Icon />
                </span>
                Edit
              </Link>
              <button
                onClick={handleDelete}
                className="bg-red-600 hover:bg-red-700 text-white px-4 py-2 rounded-lg flex items-center gap-2 transition-colors"
              >
                <span className="w-4 h-4">
                  <Trash2Icon />
                </span>
                Delete
              </button>
            </div>
          </div>
        </div>
      </WidePageLayout>

      {/* Content */}
      <WidePageLayout>
        <div className="bg-gray-800 rounded-lg border border-gray-700 overflow-hidden">
          <div className="p-6">
            {/* Summary */}
            {wiki.summary && (
              <div className="mb-6 pb-6 border-b border-gray-700">
                <h2 className="text-lg font-semibold text-white mb-2">Summary</h2>
                <p className="text-gray-300">{wiki.summary}</p>
              </div>
            )}

            {/* Rich Text Content */}
            {wiki.content && Array.isArray(wiki.content) && wiki.content.length > 0 && (
              <div className="mb-6 pb-6 border-b border-gray-700">
                <h2 className="text-lg font-semibold text-white mb-2">Content</h2>
                <RichTextContent content={wiki.content} />
              </div>
            )}

            {/* Tags */}
            {wiki.tags && wiki.tags.length > 0 && (
              <div className="mb-6 pb-6 border-b border-gray-700">
                <h2 className="text-lg font-semibold text-white mb-3">Tags</h2>
                <div className="flex flex-wrap gap-2">
                  {wiki.tags.map((tag, index) => (
                    <span
                      key={index}
                      className="px-3 py-1 bg-blue-600 text-white text-sm rounded-full"
                    >
                      {tag}
                    </span>
                  ))}
                </div>
              </div>
            )}

            {/* Metadata */}
            <div className="pt-6 border-t border-gray-700">
              <h2 className="text-lg font-semibold text-white mb-3">Metadata</h2>
              <div className="space-y-2 text-sm">
                {wiki.category && (
                  <div className="flex items-center gap-2">
                    <span className="text-gray-400 w-24">Category:</span>
                    <span className="px-2 py-1 bg-gray-700 text-gray-300 rounded text-sm">
                      {wiki.category}
                    </span>
                  </div>
                )}
                {wiki.created_by && (
                  <div className="flex items-center gap-2">
                    <span className="text-gray-400 w-24">Created By:</span>
                    <span className="text-gray-300">User #{wiki.created_by}</span>
                  </div>
                )}
                {wiki.updated_by && (
                  <div className="flex items-center gap-2">
                    <span className="text-gray-400 w-24">Updated By:</span>
                    <span className="text-gray-300">User #{wiki.updated_by}</span>
                  </div>
                )}
                <div className="flex items-center gap-2">
                  <span className="text-gray-400 w-24">Created:</span>
                  <span className="text-gray-300">
                    {wiki.created_at ? new Date(wiki.created_at).toLocaleString() : 'N/A'}
                  </span>
                </div>
                <div className="flex items-center gap-2">
                  <span className="text-gray-400 w-24">Updated:</span>
                  <span className="text-gray-300">
                    {wiki.updated_at ? new Date(wiki.updated_at).toLocaleString() : 'N/A'}
                  </span>
                </div>
              </div>
            </div>

            {/* Linked Entities Section */}
            <div className="pt-6 border-t border-gray-700 mt-6">
              <h2 className="text-lg font-semibold text-white mb-3">Linked Entities</h2>

              {/* Linked Cards */}
              {wiki.linked_cards && wiki.linked_cards.length > 0 && (
                <div className="mb-6">
                  <h3 className="text-md font-medium text-gray-300 mb-3">Linked Cards</h3>
                  <div className="space-y-2">
                    {wiki.linked_cards.map((card) => (
                      <Link
                        key={card.id}
                        to={`/boards/${boardId}/cards/${card.id}`}
                        className="block bg-gray-700 hover:bg-gray-600 border border-gray-600 hover:border-gray-500 rounded-lg p-3 transition-colors"
                      >
                        <div className="flex items-center justify-between">
                          <div className="flex-1">
                            <h4 className="text-white font-medium">{card.name}</h4>
                            {card.description && (
                              <p className="text-gray-400 text-sm mt-1 line-clamp-2">
                                {card.description}
                              </p>
                            )}
                          </div>
                          <span className="w-4 h-4 text-gray-400">
                            <ChevronRightIcon />
                          </span>
                        </div>
                      </Link>
                    ))}
                  </div>
                </div>
              )}

              {/* Linked Epics */}
              {wiki.linked_epics && wiki.linked_epics.length > 0 && (
                <div className="mb-6">
                  <h3 className="text-md font-medium text-gray-300 mb-3">Linked Epics</h3>
                  <div className="space-y-2">
                    {wiki.linked_epics.map((epic) => (
                      <Link
                        key={epic.id}
                        to={`/boards/${boardId}/epics/${epic.id}`}
                        className="block bg-gray-700 hover:bg-gray-600 border border-gray-600 hover:border-gray-500 rounded-lg p-3 transition-colors"
                      >
                        <div className="flex items-center gap-3">
                          {epic.color && (
                            <div
                              className="w-4 h-4 rounded-full flex-shrink-0"
                              style={{ backgroundColor: epic.color }}
                            />
                          )}
                          <div className="flex-1">
                            <h4 className="text-white font-medium">{epic.name}</h4>
                            {epic.description && (
                              <p className="text-gray-400 text-sm mt-1 line-clamp-2">
                                {epic.description}
                              </p>
                            )}
                          </div>
                          {epic.metrics && (
                            <div className="text-gray-400 text-sm flex-shrink-0">
                              {epic.metrics.card_count !== undefined && (
                                <span>{epic.metrics.card_count} cards</span>
                              )}
                            </div>
                          )}
                        </div>
                      </Link>
                    ))}
                  </div>
                </div>
              )}

              {/* No linked entities */}
              {(!wiki.linked_cards || wiki.linked_cards.length === 0) &&
                (!wiki.linked_epics || wiki.linked_epics.length === 0) && (
                  <div className="text-center py-8 text-gray-400">
                    <div className="text-4xl mb-2">🔗</div>
                    <p>This wiki has no linked entities yet</p>
                  </div>
                )}
            </div>
          </div>
        </div>
      </WidePageLayout>
    </div>
  );
}

export default WikiDetail;