import 'package:flutter/material.dart';
import 'package:stadtbote/content_views/pdf_viewer_page.dart';
import 'package:stadtbote/model/tour_file.dart';
import 'package:stadtbote/tools/constants.dart';
import 'package:stadtbote/tools/util.dart' show showAlertDialog;
import 'package:stadtbote/tools/util.dart' as util;

void showFilesPopup(BuildContext context, List<TourFile> files) {
  showDialog(
    context: context,
    builder: (BuildContext context) {
      return AlertDialog(
        title: const Text('Dateien'),
        content: SizedBox(
          width: double.maxFinite,
          height: 400,
          child: ListView.builder(
            shrinkWrap: true,
            itemCount: files.length,
            itemBuilder: (context, index) {
              final file = files[index];
              return _FileListItem(file: file);
            },
          ),
        ),
        actions: [
          TextButton(
            onPressed: () => Navigator.of(context).pop(),
            child: const Text('Schließen'),
          ),
        ],
      );
    },
  );
}

class _FileListItem extends StatefulWidget {
  final TourFile file;

  const _FileListItem({required this.file});

  @override
  State<_FileListItem> createState() => _FileListItemState();
}

class _FileListItemState extends State<_FileListItem> {
  bool _isLoading = false;

  @override
  Widget build(BuildContext context) {
    IconData iconData;
    if (widget.file.isPdf) {
      iconData = Icons.picture_as_pdf;
    } else if (widget.file.isImage) {
      iconData = Icons.image;
    } else {
      iconData = Icons.insert_drive_file;
    }

    return Card(
      margin: const EdgeInsets.symmetric(vertical: 4),
      child: ListTile(
        leading: Icon(iconData, color: Constants.colorPrimary),
        title: Text(widget.file.name),
        subtitle: widget.file.remark != null && widget.file.remark!.isNotEmpty
            ? Text(widget.file.remark!)
            : null,
        trailing: _isLoading
            ? const SizedBox(
                width: 24,
                height: 24,
                child: CircularProgressIndicator(strokeWidth: 2),
              )
            : const Icon(Icons.open_in_new),
        onTap: () => _openFile(context),
      ),
    );
  }

  Future<void> _openFile(BuildContext context) async {
    if (_isLoading) return;

    setState(() {
      _isLoading = true;
    });

    try {
      if (widget.file.isPdf) {
        // Show PDF in a dialog on top of the files dialog
        await showDialog(
          context: context,
          builder: (BuildContext context) {
            return Dialog(
              insetPadding: const EdgeInsets.all(8),
              child: Column(
                children: [
                  AppBar(
                    title: Text(widget.file.name),
                    leading: IconButton(
                      icon: const Icon(Icons.close),
                      onPressed: () => Navigator.of(context).pop(),
                    ),
                    automaticallyImplyLeading: false,
                  ),
                  Expanded(
                    child: PdfViewerPage(
                      pdfUrl: widget.file.url,
                      title: widget.file.name,
                    ),
                  ),
                ],
              ),
            );
          },
        );
      } else if (widget.file.isImage) {
        // Bildanhänge wie PDFs vergrößern und im gezoomten Zustand verschieben.
        await showDialog(
          context: context,
          builder: (BuildContext context) {
            return Dialog(
              insetPadding: const EdgeInsets.all(16),
              child: Column(
                children: [
                  AppBar(
                    title: Text(widget.file.name),
                    leading: IconButton(
                      icon: const Icon(Icons.close),
                      onPressed: () => Navigator.of(context).pop(),
                    ),
                    automaticallyImplyLeading: false,
                  ),
                  Expanded(
                    child: InteractiveViewer(
                      minScale: 1,
                      maxScale: 5,
                      child: SizedBox.expand(
                        child: Image.network(
                          widget.file.url,
                          fit: BoxFit.contain,
                          loadingBuilder: (context, child, loadingProgress) {
                            if (loadingProgress == null) return child;
                            return Center(
                              child: CircularProgressIndicator(
                                value: loadingProgress.expectedTotalBytes != null
                                    ? loadingProgress.cumulativeBytesLoaded /
                                        loadingProgress.expectedTotalBytes!
                                    : null,
                              ),
                            );
                          },
                          errorBuilder: (context, error, stackTrace) {
                            return Center(
                              child: Column(
                                mainAxisSize: MainAxisSize.min,
                                children: [
                                  const Icon(
                                    Icons.error_outline,
                                    size: 64,
                                    color: Colors.red,
                                  ),
                                  const SizedBox(height: 16),
                                  Text(
                                    'Fehler beim Laden des Bildes:\n$error',
                                    textAlign: TextAlign.center,
                                    style: const TextStyle(color: Colors.red),
                                  ),
                                ],
                              ),
                            );
                          },
                        ),
                      ),
                    ),
                  ),
                ],
              ),
            );
          },
        );
      } else {
        // For other file types, try to open with external app
        showAlertDialog(
          'Information',
          'Dateityp wird nicht direkt unterstützt. Die Datei wird im Browser geöffnet.',
        );
      }
    } catch (e) {
      util.Util.logException('Error opening file: $e');
      if (context.mounted) {
        showAlertDialog(
          'Fehler',
          'Fehler beim Öffnen der Datei: $e',
        );
      }
    } finally {
      if (mounted) {
        setState(() {
          _isLoading = false;
        });
      }
    }
  }
}

/// Widget to display a file icon button if files are available
class FilesIconButton extends StatelessWidget {
  final List<TourFile>? files;
  final double iconSize;

  const FilesIconButton({
    super.key,
    required this.files,
    this.iconSize = 24,
  });

  @override
  Widget build(BuildContext context) {
    if (files == null || files!.isEmpty) {
      return const SizedBox.shrink();
    }

    return IconButton(
      icon: const Icon(Icons.attach_file),
      iconSize: iconSize,
      color: Constants.colorPrimary,
      tooltip: '${files!.length} Datei(en)',
      onPressed: () => showFilesPopup(context, files!),
    );
  }
}

/// Badge widget showing file count with icon
class FilesBadge extends StatelessWidget {
  final List<TourFile>? files;
  final VoidCallback? onTap;

  const FilesBadge({
    super.key,
    required this.files,
    this.onTap,
  });

  @override
  Widget build(BuildContext context) {
    if (files == null || files!.isEmpty) {
      return const SizedBox.shrink();
    }

    return GestureDetector(
      onTap: onTap ?? () => showFilesPopup(context, files!),
      child: Container(
        padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 4),
        decoration: BoxDecoration(
          color: Constants.colorPrimary.withAlpha(30),
          borderRadius: BorderRadius.circular(12),
          border: Border.all(color: Constants.colorPrimary, width: 1),
        ),
        child: Row(
          mainAxisSize: MainAxisSize.min,
          children: [
            Icon(
              Icons.attach_file,
              size: 16,
              color: Constants.colorPrimary,
            ),
            const SizedBox(width: 4),
            Text(
              '${files!.length}',
              style: TextStyle(
                color: Constants.colorPrimary,
                fontWeight: FontWeight.bold,
                fontSize: 12,
              ),
            ),
          ],
        ),
      ),
    );
  }
}