import 'package:flutter/material.dart';
import 'package:get/get.dart';
import 'package:intl/intl.dart';

import '../../models/project.dart';
import '../../services/project_service.dart';

// ─── Segéd: hex string → Flutter Color ───────────────────────────────────────

Color _hexColor(String hex) {
  final h = hex.replaceFirst('#', '');
  return Color(int.parse(h.length == 6 ? 'FF$h' : h, radix: 16));
}

// ─── ProjectPickerView ────────────────────────────────────────────────────────

class ProjectPickerView extends StatelessWidget {
  const ProjectPickerView({super.key});

  @override
  Widget build(BuildContext context) {
    final svc = ProjectService.to;
    return Scaffold(
      appBar: AppBar(
        title: const Text('Projekt választó'),
        actions: [
          IconButton(
            icon: const Icon(Icons.add),
            tooltip: 'Új projekt',
            onPressed: () => ProjectCreateDialog.show(),
          ),
        ],
      ),
      body: Obx(() {
        if (svc.projects.isEmpty) {
          return _EmptyState(onCreateTap: ProjectCreateDialog.show);
        }
        return RefreshIndicator(
          onRefresh: svc.reloadProjects,
          child: ListView.separated(
            padding: const EdgeInsets.symmetric(vertical: 8),
            itemCount: svc.projects.length,
            separatorBuilder: (_, __) => const Divider(height: 1),
            itemBuilder: (_, i) => _ProjectTile(project: svc.projects[i]),
          ),
        );
      }),
    );
  }
}

// ─── Projekt sor ──────────────────────────────────────────────────────────────

class _ProjectTile extends StatefulWidget {
  final Project project;
  const _ProjectTile({required this.project});

  @override
  State<_ProjectTile> createState() => _ProjectTileState();
}

class _ProjectTileState extends State<_ProjectTile> {
  Map<String, int> _stats = {'points': 0, 'tracks': 0, 'notes': 0};

  @override
  void initState() {
    super.initState();
    _loadStats();
  }

  Future<void> _loadStats() async {
    if (widget.project.id == null) return;
    final s = await ProjectService.to.getStats(widget.project.id!);
    if (mounted) setState(() => _stats = s);
  }

  @override
  Widget build(BuildContext context) {
    final svc = ProjectService.to;
    final project = widget.project;
    final color = _hexColor(project.color);

    return Obx(() {
      final isActive = svc.activeProject.value?.id == project.id;
      return ListTile(
        selected: isActive,
        selectedTileColor: color.withOpacity(0.08),
        leading: Stack(children: [
          CircleAvatar(
            radius: 22,
            backgroundColor: color.withOpacity(0.15),
            child: Text(
              project.name.substring(0, 1).toUpperCase(),
              style: TextStyle(
                color: color,
                fontWeight: FontWeight.w700,
                fontSize: 16,
              ),
            ),
          ),
          if (isActive)
            Positioned(
              right: 0,
              bottom: 0,
              child: Container(
                width: 12,
                height: 12,
                decoration: BoxDecoration(
                  color: Colors.green,
                  shape: BoxShape.circle,
                  border: Border.all(
                    color: Theme.of(context).colorScheme.surface,
                    width: 1.5,
                  ),
                ),
              ),
            ),
        ]),
        title: Row(children: [
          Expanded(
            child: Text(
              project.name,
              style: TextStyle(
                fontWeight: FontWeight.w600,
                color: isActive ? color : null,
              ),
            ),
          ),
          _SyncBadge(isLocalOnly: project.isLocalOnly),
        ]),
        subtitle: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            if (project.client.isNotEmpty) ...[
              Text(project.client, style: const TextStyle(fontSize: 12)),
              const SizedBox(height: 2),
            ],
            Row(children: [
              _StatBadge(
                  Icons.location_on_outlined, _stats['points'] ?? 0, 'pont'),
              const SizedBox(width: 8),
              _StatBadge(Icons.route, _stats['tracks'] ?? 0, 'track'),
              const SizedBox(width: 8),
              _StatBadge(Icons.sticky_note_2_outlined, _stats['notes'] ?? 0,
                  'jegyzet'),
            ]),
            const SizedBox(height: 2),
            Text(
              'Létrehozva: ${DateFormat('yyyy.MM.dd').format(project.createdAt)}'
              '  ·  ${project.crs.name.toUpperCase()}',
              style: const TextStyle(fontSize: 11, color: Colors.grey),
            ),
          ],
        ),
        isThreeLine: true,
        trailing: PopupMenuButton<_Action>(
          icon: const Icon(Icons.more_vert, size: 20),
          onSelected: (a) => _onAction(a),
          itemBuilder: (_) => [
            const PopupMenuItem(
              value: _Action.edit,
              child: ListTile(
                leading: Icon(Icons.edit_outlined),
                title: Text('Szerkesztés'),
                dense: true,
              ),
            ),
            const PopupMenuDivider(),
            const PopupMenuItem(
              value: _Action.archive,
              child: ListTile(
                leading: Icon(Icons.archive_outlined, color: Colors.orange),
                title:
                    Text('Archiválás', style: TextStyle(color: Colors.orange)),
                dense: true,
              ),
            ),
          ],
        ),
        onTap: () async {
          await svc.setActiveProject(project);
          Get.back();
        },
      );
    });
  }

  void _onAction(_Action action) {
    switch (action) {
      case _Action.edit:
        ProjectCreateDialog.show(existing: widget.project);
      case _Action.archive:
        _confirmArchive();
    }
  }

  void _confirmArchive() {
    Get.dialog(AlertDialog(
      title: const Text('Projekt archiválása'),
      content: Text(
        '"${widget.project.name}" archiválásra kerül.\n'
        'Az adatok megmaradnak, de a projekt nem lesz aktívan elérhető.',
      ),
      actions: [
        TextButton(onPressed: Get.back, child: const Text('Mégse')),
        FilledButton(
          style: FilledButton.styleFrom(backgroundColor: Colors.orange),
          onPressed: () {
            Get.back();
            ProjectService.to.archiveProject(widget.project.id!);
          },
          child: const Text('Archiválás'),
        ),
      ],
    ));
  }
}

enum _Action { edit, archive }

// ─── Üres állapot ─────────────────────────────────────────────────────────────

class _EmptyState extends StatelessWidget {
  final VoidCallback onCreateTap;
  const _EmptyState({required this.onCreateTap});

  @override
  Widget build(BuildContext context) {
    return Center(
      child: Column(
        mainAxisSize: MainAxisSize.min,
        children: [
          Icon(Icons.folder_outlined, size: 64, color: Colors.grey.shade400),
          const SizedBox(height: 16),
          Text('Nincs még projekt',
              style: Theme.of(context)
                  .textTheme
                  .titleMedium
                  ?.copyWith(color: Colors.grey)),
          const SizedBox(height: 8),
          Text('Hozz létre egy projektet a kezdéshez.',
              style: TextStyle(color: Colors.grey.shade500)),
          const SizedBox(height: 24),
          FilledButton.icon(
            icon: const Icon(Icons.add),
            label: const Text('Új projekt létrehozása'),
            onPressed: onCreateTap,
          ),
        ],
      ),
    );
  }
}

// ─── Segéd widgetek ───────────────────────────────────────────────────────────

class _SyncBadge extends StatelessWidget {
  final bool isLocalOnly;
  const _SyncBadge({required this.isLocalOnly});

  @override
  Widget build(BuildContext context) {
    final color = isLocalOnly ? Colors.grey : Colors.blue;
    return Container(
      padding: const EdgeInsets.symmetric(horizontal: 6, vertical: 2),
      decoration: BoxDecoration(
        color: color.withOpacity(0.1),
        borderRadius: BorderRadius.circular(4),
        border: Border.all(color: color.withOpacity(0.3)),
      ),
      child: Row(mainAxisSize: MainAxisSize.min, children: [
        Icon(
          isLocalOnly ? Icons.phone_android : Icons.cloud_outlined,
          size: 10,
          color: color,
        ),
        const SizedBox(width: 3),
        Text(isLocalOnly ? 'Lokális' : 'Felhős',
            style: TextStyle(fontSize: 10, color: color)),
      ]),
    );
  }
}

class _StatBadge extends StatelessWidget {
  final IconData icon;
  final int count;
  final String label;
  const _StatBadge(this.icon, this.count, this.label);

  @override
  Widget build(BuildContext context) => Row(
        mainAxisSize: MainAxisSize.min,
        children: [
          Icon(icon, size: 11, color: Colors.grey),
          const SizedBox(width: 2),
          Text('$count $label',
              style: const TextStyle(fontSize: 11, color: Colors.grey)),
        ],
      );
}

// ─── ProjectCreateDialog ──────────────────────────────────────────────────────

class ProjectCreateDialog extends StatefulWidget {
  final Project? existing;
  const ProjectCreateDialog({super.key, this.existing});

  static void show({Project? existing}) => Get.dialog(
        ProjectCreateDialog(existing: existing),
        barrierDismissible: false,
      );

  @override
  State<ProjectCreateDialog> createState() => _ProjectCreateDialogState();
}

class _ProjectCreateDialogState extends State<ProjectCreateDialog> {
  late final TextEditingController _nameCtrl;
  late final TextEditingController _clientCtrl;
  late final TextEditingController _descCtrl;

  late ProjectCrs _crs;
  late String _colorHex;
  late bool _isLocalOnly;
  bool _isSubmitting = false;

  bool get _isEditing => widget.existing != null;

  static const _colorOptions = [
    '#185FA5',
    '#2E7D32',
    '#C62828',
    '#E65100',
    '#6A1B9A',
    '#00695C',
    '#283593',
    '#4E342E',
  ];

  @override
  void initState() {
    super.initState();
    final p = widget.existing;
    _nameCtrl = TextEditingController(text: p?.name ?? '');
    _clientCtrl = TextEditingController(text: p?.client ?? '');
    _descCtrl = TextEditingController(text: p?.description ?? '');
    _crs = p?.crs ?? ProjectCrs.eov;
    _colorHex = p?.color ?? _colorOptions.first;
    _isLocalOnly = p?.isLocalOnly ?? true;
  }

  @override
  void dispose() {
    _nameCtrl.dispose();
    _clientCtrl.dispose();
    _descCtrl.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Dialog(
      insetPadding: const EdgeInsets.symmetric(horizontal: 20, vertical: 24),
      child: ConstrainedBox(
        constraints: const BoxConstraints(maxWidth: 480),
        child: SingleChildScrollView(
          padding: const EdgeInsets.all(24),
          child: Column(
            mainAxisSize: MainAxisSize.min,
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              // Fejléc
              Row(children: [
                Text(
                  _isEditing ? 'Projekt szerkesztése' : 'Új projekt',
                  style: Theme.of(context).textTheme.titleLarge,
                ),
                const Spacer(),
                IconButton(icon: const Icon(Icons.close), onPressed: Get.back),
              ]),
              const SizedBox(height: 20),

              // Név
              TextField(
                controller: _nameCtrl,
                autofocus: true,
                decoration: const InputDecoration(
                  labelText: 'Projekt neve *',
                  hintText: 'pl. Dunántúli 2D vonal',
                  border: OutlineInputBorder(),
                  prefixIcon: Icon(Icons.folder_outlined),
                ),
                textCapitalization: TextCapitalization.sentences,
              ),
              const SizedBox(height: 12),

              // // Megrendelő
              // TextField(
              //   controller: _clientCtrl,
              //   decoration: const InputDecoration(
              //     labelText: 'Megrendelő',
              //     hintText: 'pl. MOL Nyrt.',
              //     border: OutlineInputBorder(),
              //     prefixIcon: Icon(Icons.business_outlined),
              //   ),
              // ),
              // const SizedBox(height: 12),

              // Leírás
              TextField(
                controller: _descCtrl,
                maxLines: 2,
                decoration: const InputDecoration(
                  labelText: 'Megjegyzés',
                  border: OutlineInputBorder(),
                  prefixIcon: Icon(Icons.notes),
                ),
              ),
              const SizedBox(height: 16),

              // Koordináta-rendszer
              const _Label('Koordináta-rendszer'),
              const SizedBox(height: 6),
              SegmentedButton<ProjectCrs>(
                segments: const [
                  ButtonSegment(
                    value: ProjectCrs.eov,
                    label: Text('EOV (HD72)'),
                    icon: Icon(Icons.straighten, size: 14),
                  ),
                  ButtonSegment(
                    value: ProjectCrs.wgs84,
                    label: Text('WGS84'),
                    icon: Icon(Icons.public, size: 14),
                  ),
                ],
                selected: {_crs},
                onSelectionChanged: (s) => setState(() => _crs = s.first),
              ),

              // Tárolás — csak új projektnél
              if (!_isEditing) ...[
                const SizedBox(height: 16),
                const _Label('Adattárolás'),
                const SizedBox(height: 6),
                SegmentedButton<bool>(
                  segments: const [
                    ButtonSegment(
                      value: true,
                      label: Text('Csak lokális'),
                      icon: Icon(Icons.phone_android, size: 14),
                    ),
                    ButtonSegment(
                      value: false,
                      label: Text('Felhős mentés'),
                      icon: Icon(Icons.cloud_outlined, size: 14),
                    ),
                  ],
                  selected: {_isLocalOnly},
                  onSelectionChanged: (s) =>
                      setState(() => _isLocalOnly = s.first),
                ),
                const SizedBox(height: 6),
                Text(
                  _isLocalOnly
                      ? '📱  Az adatok csak ezen a készüléken maradnak.'
                      : '☁  Az adatok szinkronizálódnak a szerverre.',
                  style: TextStyle(fontSize: 12, color: Colors.grey.shade600),
                ),
              ],
              const SizedBox(height: 16),

              // Szín
              const _Label('Projekt szín'),
              const SizedBox(height: 8),
              Wrap(
                spacing: 8,
                runSpacing: 6,
                children: _colorOptions.map((hex) {
                  final selected = _colorHex == hex;
                  return GestureDetector(
                    onTap: () => setState(() => _colorHex = hex),
                    child: AnimatedContainer(
                      duration: const Duration(milliseconds: 150),
                      width: 32,
                      height: 32,
                      decoration: BoxDecoration(
                        color: _hexColor(hex),
                        shape: BoxShape.circle,
                        border: selected
                            ? Border.all(
                                color: Theme.of(context).colorScheme.onSurface,
                                width: 2.5)
                            : null,
                        boxShadow: selected
                            ? [
                                BoxShadow(
                                    color: _hexColor(hex).withOpacity(0.5),
                                    blurRadius: 6,
                                    spreadRadius: 1)
                              ]
                            : null,
                      ),
                      child: selected
                          ? const Icon(Icons.check,
                              color: Colors.white, size: 16)
                          : null,
                    ),
                  );
                }).toList(),
              ),
              const SizedBox(height: 24),

              // Gombok
              Row(
                mainAxisAlignment: MainAxisAlignment.end,
                children: [
                  TextButton(
                    onPressed: _isSubmitting ? null : Get.back,
                    child: const Text('Mégse'),
                  ),
                  const SizedBox(width: 12),
                  FilledButton(
                    onPressed: _isSubmitting ? null : _submit,
                    child: _isSubmitting
                        ? const SizedBox(
                            width: 18,
                            height: 18,
                            child: CircularProgressIndicator(strokeWidth: 2))
                        : Text(_isEditing ? 'Mentés' : 'Létrehozás'),
                  ),
                ],
              ),
            ],
          ),
        ),
      ),
    );
  }

  Future<void> _submit() async {
    final name = _nameCtrl.text.trim();
    if (name.isEmpty) {
      Get.snackbar('Hiányzó adat', 'A projekt neve kötelező.',
          snackPosition: SnackPosition.TOP);
      return;
    }
    setState(() => _isSubmitting = true);
    try {
      final svc = ProjectService.to;
      if (_isEditing) {
        await svc.updateProject(widget.existing!.copyWith(
          name: name,
          client: _clientCtrl.text.trim(),
          description: _descCtrl.text.trim(),
          crs: _crs,
          color: _colorHex,
        ));
        Get.back();
        Get.snackbar('Projekt frissítve', name,
            snackPosition: SnackPosition.BOTTOM);
      } else {
        final Project created;
        if (_isLocalOnly) {
          created = await svc.createLocalProject(
            name: name,
            client: _clientCtrl.text.trim(),
            crs: _crs,
            color: _colorHex,
          );
        } else {
          created = await svc.createOnlineProject(
            name: name,
            client: _clientCtrl.text.trim(),
            crs: _crs,
            color: _colorHex,
          );
        }
        await svc.setActiveProject(created);
        Get.snackbar(
          'Projekt létrehozva',
          '$name — aktív projektnek beállítva.',
          snackPosition: SnackPosition.BOTTOM,
          duration: const Duration(seconds: 3),
        );
      }
    } catch (e) {
      Get.snackbar('Hiba', e.toString(),
          backgroundColor: Colors.red,
          colorText: Colors.white,
          snackPosition: SnackPosition.TOP);
    } finally {
      if (mounted) setState(() => _isSubmitting = false);
    }
  }
}

class _Label extends StatelessWidget {
  final String text;
  const _Label(this.text);

  @override
  Widget build(BuildContext context) => Text(
        text,
        style: const TextStyle(fontSize: 12, color: Colors.grey),
      );
}