import 'package:flutter/material.dart';
import 'package:syncfusion_flutter_pdfviewer/pdfviewer.dart';

/// A dialog for searching text within a PDF using SfPdfViewer's built-in search.
class PdfTextSearchDialog extends StatefulWidget {
  final PdfViewerController viewerController;

  const PdfTextSearchDialog({super.key, required this.viewerController});

  @override
  State<PdfTextSearchDialog> createState() => _PdfTextSearchDialogState();
}

class _PdfTextSearchDialogState extends State<PdfTextSearchDialog> {
  final TextEditingController _queryController = TextEditingController();
  PdfTextSearchResult? _searchResult;
  String _statusText = '';

  @override
  void dispose() {
    _queryController.dispose();
    _searchResult?.clear();
    super.dispose();
  }

  void _search() {
    final query = _queryController.text.trim();
    if (query.isEmpty) return;

    final result = widget.viewerController.searchText(query);
    setState(() {
      _searchResult = result;
      _updateStatus();
    });
  }

  void _nextMatch() {
    _searchResult?.nextInstance();
    _updateStatus();
  }

  void _previousMatch() {
    _searchResult?.previousInstance();
    _updateStatus();
  }

  void _updateStatus() {
    final result = _searchResult;
    if (result == null || result.totalInstanceCount == 0) {
      setState(() => _statusText = 'No matches');
    } else {
      setState(() {
        _statusText =
            '${result.currentInstanceIndex} of ${result.totalInstanceCount} matches';
      });
    }
  }

  @override
  Widget build(BuildContext context) {
    return Dialog(
      child: ConstrainedBox(
        constraints: const BoxConstraints(maxWidth: 400),
        child: Padding(
          padding: const EdgeInsets.all(16),
          child: Column(
            mainAxisSize: MainAxisSize.min,
            children: [
              Row(
                children: [
                  Expanded(
                    child: TextField(
                      controller: _queryController,
                      autofocus: true,
                      decoration: const InputDecoration(
                        hintText: 'Search in PDF...',
                        prefixIcon: Icon(Icons.search),
                        isDense: true,
                        border: OutlineInputBorder(),
                      ),
                      onSubmitted: (_) => _search(),
                    ),
                  ),
                  const SizedBox(width: 8),
                  IconButton(
                    icon: const Icon(Icons.search),
                    tooltip: 'Search',
                    onPressed: _search,
                  ),
                ],
              ),
              const SizedBox(height: 12),
              Row(
                children: [
                  Text(
                    _statusText,
                    style: Theme.of(context).textTheme.bodySmall,
                  ),
                  const Spacer(),
                  IconButton(
                    icon: const Icon(Icons.keyboard_arrow_up),
                    tooltip: 'Previous match',
                    onPressed:
                        _searchResult != null &&
                            _searchResult!.totalInstanceCount > 0
                        ? _previousMatch
                        : null,
                    iconSize: 20,
                  ),
                  IconButton(
                    icon: const Icon(Icons.keyboard_arrow_down),
                    tooltip: 'Next match',
                    onPressed:
                        _searchResult != null &&
                            _searchResult!.totalInstanceCount > 0
                        ? _nextMatch
                        : null,
                    iconSize: 20,
                  ),
                  IconButton(
                    icon: const Icon(Icons.close),
                    tooltip: 'Clear search',
                    onPressed: () {
                      _searchResult?.clear();
                      setState(() {
                        _queryController.clear();
                        _searchResult = null;
                        _statusText = '';
                      });
                    },
                    iconSize: 20,
                  ),
                ],
              ),
            ],
          ),
        ),
      ),
    );
  }
}