import 'dart:async';

import 'package:flutter/material.dart';

import 'package:listenmeister/main.dart';
import 'package:listenmeister/models/models.dart';
import 'package:listenmeister/pages/layout_detail.dart';

class LayoutsPage extends StatefulWidget {
  const LayoutsPage({super.key});

  @override
  State<LayoutsPage> createState() => _LayoutsPageState();
}

class _LayoutsPageState extends State<LayoutsPage> {
  late Future<List<StoreLayout>> _layoutsFuture;
  StreamSubscription? _layoutsSubscription;

  @override
  void initState() {
    super.initState();
    _loadLayouts();
    _layoutsSubscription = apiService.watchStoreLayouts().listen((_) {
      _loadLayouts();
    });
  }

  @override
  void dispose() {
    _layoutsSubscription?.cancel();
    super.dispose();
  }

  void _loadLayouts() {
    _layoutsFuture = apiService.getStoreLayouts();
    setState(() {});
  }

  Future<void> _createLayout() async {
    final TextEditingController nameCtl = TextEditingController();
    final TextEditingController addressCtl = TextEditingController();
    final TextEditingController latCtl = TextEditingController();
    final TextEditingController lonCtl = TextEditingController();
    bool isPublic = false;

    final bool? ok = await showDialog<bool>(
      context: context,
      builder: (context) {
        return StatefulBuilder(
          builder: (context, setDialogState) {
            return AlertDialog(
              title: const Text('Neues Ladenlayout'),
              content: SingleChildScrollView(
                child: Column(
                  mainAxisSize: MainAxisSize.min,
                  children: [
                    TextField(
                      controller: nameCtl,
                      decoration: const InputDecoration(labelText: 'Name'),
                      autofocus: true,
                    ),
                    TextField(
                      controller: addressCtl,
                      decoration: const InputDecoration(
                        labelText: 'Adresse (optional)',
                      ),
                    ),
                    TextField(
                      controller: latCtl,
                      decoration: const InputDecoration(
                        labelText: 'Breitengrad (optional)',
                      ),
                      keyboardType: const TextInputType.numberWithOptions(
                        decimal: true,
                        signed: true,
                      ),
                    ),
                    TextField(
                      controller: lonCtl,
                      decoration: const InputDecoration(
                        labelText: 'Längengrad (optional)',
                      ),
                      keyboardType: const TextInputType.numberWithOptions(
                        decimal: true,
                        signed: true,
                      ),
                    ),
                    SwitchListTile.adaptive(
                      value: isPublic,
                      onChanged: (value) {
                        setDialogState(() => isPublic = value);
                      },
                      title: const Text('Für andere sichtbar'),
                      contentPadding: EdgeInsets.zero,
                    ),
                  ],
                ),
              ),
              actions: [
                TextButton(
                  onPressed: () => Navigator.pop(context, false),
                  child: const Text('Abbrechen'),
                ),
                TextButton(
                  onPressed: () => Navigator.pop(context, true),
                  child: const Text('Erstellen'),
                ),
              ],
            );
          },
        );
      },
    );

    if (ok != true) return;

    final String name = nameCtl.text.trim();
    if (name.isEmpty) return;

    double? latitude;
    double? longitude;
    final String latText = latCtl.text.trim();
    final String lonText = lonCtl.text.trim();

    if (latText.isNotEmpty) {
      latitude = double.tryParse(latText.replaceAll(',', '.'));
      if (latitude == null) {
        if (mounted) {
          ScaffoldMessenger.of(context).showSnackBar(
            const SnackBar(content: Text('Ungültiger Breitengrad.')),
          );
        }
        return;
      }
    }
    if (lonText.isNotEmpty) {
      longitude = double.tryParse(lonText.replaceAll(',', '.'));
      if (longitude == null) {
        if (mounted) {
          ScaffoldMessenger.of(context).showSnackBar(
            const SnackBar(content: Text('Ungültiger Längengrad.')),
          );
        }
        return;
      }
    }

    try {
      await apiService.createStoreLayout(
        name: name,
        latitude: latitude,
        longitude: longitude,
        address: addressCtl.text.trim().isEmpty ? null : addressCtl.text.trim(),
        isPublic: isPublic,
      );
      _loadLayouts();
    } catch (e) {
      if (mounted) {
        ScaffoldMessenger.of(
          context,
        ).showSnackBar(SnackBar(content: Text('Fehler: $e')));
      }
    }
  }

  Future<void> _openLayout(StoreLayout layout) async {
    await Navigator.of(context).push<StoreLayout>(
      MaterialPageRoute(builder: (_) => LayoutDetailPage(layout: layout)),
    );
    if (mounted) {
      _loadLayouts();
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('Ladenlayouts')),
      body: FutureBuilder<List<StoreLayout>>(
        future: _layoutsFuture,
        builder: (context, snapshot) {
          if (snapshot.connectionState == ConnectionState.waiting) {
            return const Center(child: CircularProgressIndicator());
          }
          if (snapshot.hasError) {
            return Center(child: Text('Fehler: ${snapshot.error}'));
          }

          final layouts = snapshot.data ?? [];
          if (layouts.isEmpty) {
            return const Center(child: Text('Noch keine Layouts vorhanden.'));
          }

          return ListView.builder(
            itemCount: layouts.length,
            itemBuilder: (context, index) {
              final layout = layouts[index];
              return ListTile(
                title: Text(layout.name),
                subtitle: layout.address != null && layout.address!.isNotEmpty
                    ? Text(layout.address!)
                    : null,
                leading: Icon(
                  layout.owner == apiService.userId
                      ? Icons.store_mall_directory
                      : Icons.share,
                ),
                trailing: layout.isPublic
                    ? const Icon(Icons.public, size: 20)
                    : null,
                onTap: () => _openLayout(layout),
              );
            },
          );
        },
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _createLayout,
        child: const Icon(Icons.add),
      ),
    );
  }
}