import 'package:flutter/material.dart';
import 'package:firebase_storage/firebase_storage.dart';
import 'package:flutter_dropzone/flutter_dropzone.dart';
import 'package:path/path.dart' as p;

class DropzoneUploadWidget extends StatefulWidget {
  final List<Map<String, String>> uploadedFiles;
  final ValueChanged<List<Map<String, String>>> onFilesChanged;
  final bool isLoading;
  final String? error;
  final String? success;
  final double width;
  final double height;

  const DropzoneUploadWidget({
    super.key,
    required this.uploadedFiles,
    required this.onFilesChanged,
    this.isLoading = false,
    this.error,
    this.success,
    this.width = 400,
    this.height = 200,
  });

  @override
  State<DropzoneUploadWidget> createState() => _DropzoneUploadWidgetState();
}

class _DropzoneUploadWidgetState extends State<DropzoneUploadWidget> {
  DropzoneViewController? _dropzoneController;
  bool _isDropzoneHighlighted = false;
  bool _isLoading = false;
  String? _error;
  String? _success;

  @override
  void initState() {
    super.initState();
    _isLoading = widget.isLoading;
    _error = widget.error;
    _success = widget.success;
  }

  Future<void> _handleFiles(List<dynamic> files) async {
    setState(() => _isLoading = true);
    try {
      List<Map<String, String>> newFiles = List.from(widget.uploadedFiles);
      for (final file in files) {
        final name = await _dropzoneController!.getFilename(file);
        final bytes = await _dropzoneController!.getFileData(file);
        if (bytes != null) {
          final ref = FirebaseStorage.instance.ref().child(
              'events/temp/${DateTime.now().millisecondsSinceEpoch}_$name');
          final uploadTask = await ref.putData(bytes);
          final url = await uploadTask.ref.getDownloadURL();
          if (!newFiles.any((f) => f['name'] == name && f['url'] == url)) {
            newFiles.add({'name': name, 'url': url});
          }
        }
      }
      widget.onFilesChanged(newFiles);
      setState(() {
        _success = "Fichier(s) ajouté(s) !";
        _error = null;
      });
    } catch (e) {
      setState(() {
        _error = 'Erreur lors de l\'upload : $e';
        _success = null;
      });
    } finally {
      setState(() {
        _isLoading = false;
        _isDropzoneHighlighted = false;
      });
    }
  }

  @override
  Widget build(BuildContext context) {
    return SizedBox(
      width: widget.width,
      height: widget.height,
      child: Container(
        decoration: BoxDecoration(
          border: Border.all(
            color: _isDropzoneHighlighted ? Colors.blue : Colors.grey,
            width: 2,
          ),
          borderRadius: BorderRadius.circular(8),
          color: _isDropzoneHighlighted ? Colors.blue.withOpacity(0.1) : null,
        ),
        child: Stack(
          children: [
            DropzoneView(
              onCreated: (controller) => _dropzoneController = controller,
              onDropFiles: (files) async {
                if (files == null) return;
                await _handleFiles(files);
              },
              onHover: () => setState(() => _isDropzoneHighlighted = true),
              onLeave: () => setState(() => _isDropzoneHighlighted = false),
            ),
            Positioned.fill(
              child: IgnorePointer(
                child: widget.uploadedFiles.isEmpty
                    ? Column(
                        mainAxisAlignment: MainAxisAlignment.center,
                        crossAxisAlignment: CrossAxisAlignment.center,
                        children: [
                          const Icon(Icons.cloud_upload,
                              size: 48, color: Colors.grey),
                          const SizedBox(height: 12),
                          const Text(
                            'Glissez-déposez des fichiers ici ou cliquez sur "Ajouter"',
                            textAlign: TextAlign.center,
                            style: TextStyle(color: Colors.grey, fontSize: 16),
                          ),
                          const SizedBox(height: 16),
                        ],
                      )
                    : null,
              ),
            ),
            if (widget.uploadedFiles.isNotEmpty)
              Padding(
                padding: const EdgeInsets.all(8.0),
                child: _buildFileListAndButton(),
              ),
            if (widget.uploadedFiles.isEmpty)
              Positioned(
                bottom: 16,
                left: 0,
                right: 0,
                child: Center(
                  child: SizedBox(
                    width: 160,
                    child: ElevatedButton.icon(
                      icon: const Icon(Icons.attach_file, size: 18),
                      label: const Text('Ajouter'),
                      style: ElevatedButton.styleFrom(
                        padding: const EdgeInsets.symmetric(
                            horizontal: 8, vertical: 8),
                        minimumSize: const Size(80, 36),
                        textStyle: const TextStyle(fontSize: 14),
                      ),
                      onPressed: _isLoading
                          ? null
                          : () async {
                              final files =
                                  await _dropzoneController?.pickFiles();
                              if (files != null) {
                                await _handleFiles(files);
                              }
                            },
                    ),
                  ),
                ),
              ),
            if (_isLoading)
              const Positioned.fill(
                child: ColoredBox(
                  color: Color.fromARGB(80, 255, 255, 255),
                  child: Center(
                    child: SizedBox(
                        width: 32,
                        height: 32,
                        child: CircularProgressIndicator()),
                  ),
                ),
              ),
            if (_error != null)
              Positioned(
                bottom: 0,
                left: 0,
                right: 0,
                child: Padding(
                  padding: EdgeInsets.only(top: 8.0),
                  child:
                      Text(_error!, style: const TextStyle(color: Colors.red)),
                ),
              ),
            if (_success != null)
              Positioned(
                bottom: 0,
                left: 0,
                right: 0,
                child: Padding(
                  padding: const EdgeInsets.only(top: 32.0),
                  child: Text(_success!,
                      style: const TextStyle(color: Colors.green)),
                ),
              ),
          ],
        ),
      ),
    );
  }

  Widget _buildFileListAndButton() {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        ...widget.uploadedFiles.map((file) {
          final fileName = file['name']!;
          final ext = p.extension(fileName).toLowerCase();
          IconData icon;
          if ([".jpg", ".jpeg", ".png", ".gif", ".bmp", ".webp"]
              .contains(ext)) {
            icon = Icons.image;
          } else if (ext == ".pdf") {
            icon = Icons.picture_as_pdf;
          } else if ([".txt", ".md", ".csv", ".json", ".xml"].contains(ext)) {
            icon = Icons.description;
          } else {
            icon = Icons.attach_file;
          }
          return ListTile(
            leading: Icon(icon, color: Colors.blueGrey),
            title: Text(fileName, overflow: TextOverflow.ellipsis),
            trailing: IconButton(
              icon: const Icon(Icons.close),
              onPressed: _isLoading
                  ? null
                  : () {
                      final newFiles =
                          List<Map<String, String>>.from(widget.uploadedFiles)
                            ..remove(file);
                      widget.onFilesChanged(newFiles);
                    },
            ),
            contentPadding: EdgeInsets.zero,
            dense: true,
          );
        }).toList(),
        SizedBox(
          width: 160,
          child: ElevatedButton.icon(
            icon: const Icon(Icons.attach_file, size: 18),
            label: const Text('Ajouter'),
            style: ElevatedButton.styleFrom(
              padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 8),
              minimumSize: const Size(80, 36),
              textStyle: const TextStyle(fontSize: 14),
            ),
            onPressed: _isLoading
                ? null
                : () async {
                    final files = await _dropzoneController?.pickFiles();
                    if (files != null) {
                      await _handleFiles(files);
                    }
                  },
          ),
        ),
      ],
    );
  }
}