import 'package:flutter/material.dart';
import 'package:file_picker/file_picker.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:flux/core/blocs/session/session_cubit.dart';
import 'package:flux/core/theme/theme.dart';
import 'package:flux/core/widgets/image_viewer_widget.dart';
import 'package:flux/core/widgets/pdf_viewer_widget.dart';
import 'package:flux/core/widgets/qr_upload_dialog.dart';
import 'package:flux/features/attachments/models/attachment_model.dart';
import 'package:flux/features/customers/blocs/customer_files_bloc.dart';
import 'package:flux/features/customers/models/customer_model.dart';

class CustomerDetailScreen extends StatefulWidget {
  final CustomerModel customer;
  const CustomerDetailScreen({super.key, required this.customer});

  @override
  State<CustomerDetailScreen> createState() => _CustomerDetailScreenState();
}

class _CustomerDetailScreenState extends State<CustomerDetailScreen> {
  @override
  void initState() {
    super.initState();
    _loadFiles();
  }

  void _loadFiles() {
    context.read<CustomerFilesBloc>().add(LoadCustomerFilesEvent());
  }

  Future<void> _pickAndUpload() async {
    CustomerFilesBloc customerFilesBloc = context.read<CustomerFilesBloc>();

    // Chiamata statica pulita
    FilePickerResult? result = await FilePicker.pickFiles(
      allowMultiple: true,
      type: FileType.any,
      withData: true, // Fondamentale per avere i bytes pronti se servono
    );

    if (result != null) {
      for (var pickedFile in result.files) {
        try {
          customerFilesBloc.add(
            UploadCustomerFileEvent(pickedFile: pickedFile),
          );
        } catch (e) {
          if (mounted) {
            ScaffoldMessenger.of(context).showSnackBar(
              SnackBar(content: Text("Errore upload ${pickedFile.name}: $e")),
            );
          }
        }
      }
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: context.background,
      appBar: AppBar(
        title: Text(
          widget.customer.name,
          style: const TextStyle(fontWeight: FontWeight.bold),
        ),
        backgroundColor: context.background,
        elevation: 0,
      ),
      body: Row(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          // COLONNA SINISTRA: ANAGRAFICA
          Expanded(
            flex: 1,
            child: SingleChildScrollView(
              padding: const EdgeInsets.all(24),
              child: _buildInfoSection(),
            ),
          ),

          // DIVISORE VERTICALE
          VerticalDivider(
            width: 1,
            color: context.accent.withValues(alpha: 0.1),
          ),

          // COLONNA DESTRA: DOCUMENTI
          Expanded(
            flex: 2,
            child: Padding(
              padding: const EdgeInsets.all(24),
              child: _buildDocumentSection(),
            ),
          ),
        ],
      ),
    );
  }

  Widget _buildInfoSection() {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        _infoTile(Icons.phone_android, "Telefono", widget.customer.phoneNumber),
        _infoTile(
          Icons.email_outlined,
          "Email",
          widget.customer.email.isEmpty ? "Non fornita" : widget.customer.email,
        ),
        _infoTile(
          Icons.notes_outlined,
          "Note",
          widget.customer.note.isEmpty
              ? "Nessun appunto"
              : widget.customer.note,
        ),
        const SizedBox(height: 20),
        if (widget.customer.doNotDisturb)
          Container(
            padding: const EdgeInsets.all(12),
            decoration: BoxDecoration(
              color: Colors.red.withValues(alpha: 0.1),
              borderRadius: BorderRadius.circular(8),
            ),
            child: const Row(
              children: [
                Icon(Icons.privacy_tip, color: Colors.red, size: 20),
                SizedBox(width: 10),
                Text(
                  "PRIVACY: Non disturbare",
                  style: TextStyle(
                    color: Colors.red,
                    fontWeight: FontWeight.bold,
                  ),
                ),
              ],
            ),
          ),
      ],
    );
  }

  Widget _buildDocumentSection() {
    return BlocBuilder<CustomerFilesBloc, CustomerFilesState>(
      builder: (context, state) {
        return Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Row(
              mainAxisAlignment: MainAxisAlignment.spaceBetween,
              children: [
                Text(
                  "DOCUMENTI",
                  style: TextStyle(
                    fontSize: 18,
                    fontWeight: FontWeight.bold,
                    color: context.accent,
                  ),
                ),
                // ZONA BOTTONI: Li mettiamo in una Row
                Row(
                  children: [
                    // Bottone classico: c'è sempre (carica da disco locale)
                    ElevatedButton.icon(
                      onPressed: _pickAndUpload,
                      icon: const Icon(Icons.add_circle_outline),
                      label: const Text("CARICA FILE"),
                    ),
                    const SizedBox(width: 12),
                    ElevatedButton.icon(
                      onPressed: state.selectedFiles.isEmpty
                          ? null
                          : () => _showDeleteConfirmationDialog(
                              context: context,
                              files: state.selectedFiles,
                            ),
                      icon: const Icon(Icons.delete_outline),
                      label: const Text("ELIMINA FILE"),
                    ),

                    // Controlliamo se siamo su Desktop/Web per mostrare il QR
                    if (!context.read<SessionCubit>().state.isMobileDevice) ...[
                      const SizedBox(
                        width: 12,
                      ), // Un po' di respiro tra i bottoni
                      ElevatedButton.icon(
                        onPressed: () {
                          showDialog(
                            context: context,
                            builder: (context) => QrUploadDialog(
                              deepLinkUrl:
                                  'fluxapp://customer/${widget.customer.id}/upload?name=${Uri.encodeComponent(widget.customer.name)}',
                              title: 'Scatta per ${widget.customer.name}',
                            ),
                          );
                        },
                        icon: const Icon(Icons.qr_code),
                        label: const Text("GENERA QR"),
                        style: ElevatedButton.styleFrom(
                          // Lo facciamo di un colore leggermente diverso per distinguerlo
                          backgroundColor: context.accent.withValues(
                            alpha: 0.1,
                          ),
                          foregroundColor: context.accent,
                          elevation: 0,
                        ),
                      ),
                    ],
                  ],
                ),
              ],
            ),
            const SizedBox(height: 20),
            if (state.status == CustomerFilesStatus.loading)
              const Center(child: CircularProgressIndicator())
            else if (state.customerFiles.isEmpty)
              const Center(child: Text("Nessun documento presente"))
            else
              Expanded(
                child: GridView.builder(
                  gridDelegate: const SliverGridDelegateWithMaxCrossAxisExtent(
                    maxCrossAxisExtent: 200,
                    mainAxisSpacing: 16,
                    crossAxisSpacing: 16,
                    childAspectRatio: 1.2,
                  ),
                  itemCount: state.customerFiles.length,
                  itemBuilder: (context, index) =>
                      _FileCard(file: state.customerFiles[index], state: state),
                ),
              ),
          ],
        );
      },
    );
  }

  Widget _infoTile(IconData icon, String label, String value) {
    return Padding(
      padding: const EdgeInsets.only(bottom: 20),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Row(
            children: [
              Icon(icon, size: 18, color: context.accent),
              const SizedBox(width: 8),
              Text(label, style: const TextStyle(fontWeight: FontWeight.w600)),
            ],
          ),
          const SizedBox(height: 4),
          Text(
            value,
            style: TextStyle(color: context.secondaryText, fontSize: 16),
          ),
        ],
      ),
    );
  }

  void _showDeleteConfirmationDialog({
    required BuildContext context,
    required List<AttachmentModel> files,
  }) {}
}

class _FileCard extends StatelessWidget {
  final AttachmentModel file;
  final CustomerFilesState state;
  const _FileCard({required this.file, required this.state});

  @override
  Widget build(BuildContext context) {
    return GestureDetector(
      onTap: () => context.read<CustomerFilesBloc>().add(
        ToggleCustomerFileSelectionEvent(file),
      ),
      onDoubleTap: () => _handleDoubleClickOnFile(context, file),
      child: Stack(
        children: [
          Container(
            decoration: BoxDecoration(
              color: context.background,
              borderRadius: BorderRadius.circular(12),
              border: Border.all(color: context.accent.withValues(alpha: 0.1)),
            ),
            child: Column(
              mainAxisAlignment: MainAxisAlignment.center,
              children: [
                Icon(
                  _getFileIcon(file.extension),
                  size: 48,
                  color: context.accent,
                ),
                const SizedBox(height: 8),
                Padding(
                  padding: const EdgeInsets.symmetric(horizontal: 8),
                  child: Text(
                    file.name,
                    maxLines: 1,
                    overflow: TextOverflow.ellipsis,
                    style: const TextStyle(
                      fontSize: 12,
                      fontWeight: FontWeight.w500,
                    ),
                  ),
                ),
              ],
            ),
          ),
          if (state.selectedFiles.contains(file))
            Positioned(
              top: 10,
              left: 10,
              child: Icon(Icons.check_circle, color: context.accent, size: 24),
            ),
        ],
      ),
    );
  }

  IconData _getFileIcon(String ext) {
    switch (ext.toLowerCase()) {
      case 'pdf':
        return Icons.picture_as_pdf;
      case 'jpg':
      case 'jpeg':
      case 'png':
        return Icons.image;
      default:
        return Icons.insert_drive_file;
    }
  }

  void _handleDoubleClickOnFile(BuildContext context, AttachmentModel file) {
    showDialog(
      context: context,
      barrierDismissible: true,
      builder: (ctx) => Dialog(
        insetPadding: const EdgeInsets.all(16),
        shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(12)),
        child: ClipRRect(
          borderRadius: BorderRadius.circular(12),
          child: SizedBox(
            width: double.infinity,
            height: MediaQuery.of(context).size.height * 0.8,
            child: file.isPdf
                ? PdfViewerWidget(storagePath: file.storagePath)
                : ImageViewerWidget(storagePath: file.storagePath),
          ),
        ),
      ),
    );
  }
}