// lib/widgets/map_edit_tools/note_photo_gallery.dart
//
// Fotó galéria a MapFeatureSaveSheet-ben:
//  - Vízszintes görgetős sor
//  - + gomb: kamera / galéria választó
//  - Fotóra koppintva: teljes képernyős nézet + felirat szerkesztés
//  - Fotóra hosszan nyomva: törlés

import 'dart:io';

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

import '../../models/note_item_photo.dart';
import '../../services/note_photo_service.dart';

class NotePhotoGallery extends StatefulWidget {
  /// A szerkesztett NoteItem id-ja — null ha az elem még nincs elmentve
  final int? noteItemId;

  const NotePhotoGallery({super.key, required this.noteItemId});

  @override
  State<NotePhotoGallery> createState() => _NotePhotoGalleryState();
}

class _NotePhotoGalleryState extends State<NotePhotoGallery> {
  List<NoteItemPhoto> _photos = [];
  bool _loading = false;

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

  Future<void> _loadPhotos() async {
    if (widget.noteItemId == null) return;
    setState(() => _loading = true);
    _photos = await NotePhotoService.to.loadPhotos(widget.noteItemId!);
    if (mounted) setState(() => _loading = false);
  }

  @override
  Widget build(BuildContext context) {
    // NoteItem nem mentett még — nem lehet fotót hozzáadni
    if (widget.noteItemId == null) {
      return const _DisabledGallery();
    }

    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        Row(children: [
          Text('Fotók',
              style: TextStyle(fontSize: 13, color: Colors.grey.shade600)),
          const SizedBox(width: 6),
          if (_photos.isNotEmpty)
            Container(
              padding: const EdgeInsets.symmetric(horizontal: 6, vertical: 1),
              decoration: BoxDecoration(
                color: Colors.grey.shade200,
                borderRadius: BorderRadius.circular(10),
              ),
              child: Text(
                '${_photos.length}',
                style:
                    const TextStyle(fontSize: 11, fontWeight: FontWeight.w600),
              ),
            ),
        ]),
        const SizedBox(height: 8),
        if (_loading)
          const SizedBox(
            height: 80,
            child: Center(child: CircularProgressIndicator()),
          )
        else
          SizedBox(
            height: 88,
            child: ListView(
              scrollDirection: Axis.horizontal,
              children: [
                // Meglévő fotók
                ..._photos.map((photo) => _PhotoThumb(
                      photo: photo,
                      onTap: () => _openViewer(photo),
                      onDelete: () => _delete(photo),
                    )),

                // + Fotó hozzáadása gomb
                _AddPhotoButton(
                  onCamera: () => _addPhoto(fromCamera: true),
                  onGallery: () => _addPhoto(fromCamera: false),
                ),
              ],
            ),
          ),
      ],
    );
  }

  Future<void> _addPhoto({required bool fromCamera}) async {
    final svc = NotePhotoService.to;
    final photo = fromCamera
        ? await svc.takePhoto(widget.noteItemId!)
        : await svc.pickFromGallery(widget.noteItemId!);

    if (photo != null && mounted) {
      setState(() => _photos.add(photo));
    }
  }

  Future<void> _delete(NoteItemPhoto photo) async {
    final ok = await Get.dialog<bool>(AlertDialog(
      title: const Text('Fotó törlése'),
      content: const Text('Ez a fotó véglegesen törlődik.'),
      actions: [
        TextButton(onPressed: Get.back, child: const Text('Mégse')),
        FilledButton(
          style: FilledButton.styleFrom(backgroundColor: Colors.red),
          onPressed: () => Get.back(result: true),
          child: const Text('Törlés'),
        ),
      ],
    ));

    if (ok == true && mounted) {
      await NotePhotoService.to.deletePhoto(photo);
      setState(() => _photos.removeWhere((p) => p.id == photo.id));
    }
  }

  void _openViewer(NoteItemPhoto photo) {
    Get.to(() => _PhotoViewerPage(
          photos: _photos,
          initialIndex: _photos.indexWhere((p) => p.id == photo.id),
          onCaptionSaved: (updated) {
            setState(() {
              final idx = _photos.indexWhere((p) => p.id == updated.id);
              if (idx >= 0) _photos[idx] = updated;
            });
          },
        ));
  }
}

// ─── Fotó bélyegkép ──────────────────────────────────────────────────────────

class _PhotoThumb extends StatelessWidget {
  final NoteItemPhoto photo;
  final VoidCallback onTap;
  final VoidCallback onDelete;

  const _PhotoThumb({
    required this.photo,
    required this.onTap,
    required this.onDelete,
  });

  @override
  Widget build(BuildContext context) {
    return Padding(
      padding: const EdgeInsets.only(right: 8),
      child: GestureDetector(
        onTap: onTap,
        onLongPress: onDelete,
        child: Stack(children: [
          ClipRRect(
            borderRadius: BorderRadius.circular(8),
            child: photo.fileExists
                ? Image.file(
                    photo.file,
                    width: 80, height: 80,
                    fit: BoxFit.cover,
                    cacheWidth: 160, // memória optimalizálás
                  )
                : Container(
                    width: 80,
                    height: 80,
                    color: Colors.grey.shade200,
                    child: const Icon(Icons.broken_image, color: Colors.grey),
                  ),
          ),
          // Felirat jelzése ha van
          if (photo.caption.isNotEmpty)
            Positioned(
              bottom: 0,
              left: 0,
              right: 0,
              child: Container(
                padding: const EdgeInsets.symmetric(horizontal: 4, vertical: 2),
                decoration: BoxDecoration(
                  gradient: LinearGradient(
                    begin: Alignment.bottomCenter,
                    end: Alignment.topCenter,
                    colors: [
                      Colors.black.withOpacity(0.7),
                      Colors.transparent,
                    ],
                  ),
                  borderRadius:
                      const BorderRadius.vertical(bottom: Radius.circular(8)),
                ),
                child: Text(
                  photo.caption,
                  style: const TextStyle(color: Colors.white, fontSize: 9),
                  maxLines: 1,
                  overflow: TextOverflow.ellipsis,
                ),
              ),
            ),
          // GPS jelzése ha van
          if (photo.location != null)
            Positioned(
              top: 4,
              right: 4,
              child: Container(
                padding: const EdgeInsets.all(2),
                decoration: BoxDecoration(
                  color: Colors.black.withOpacity(0.5),
                  borderRadius: BorderRadius.circular(4),
                ),
                child: const Icon(Icons.location_on,
                    color: Colors.white, size: 10),
              ),
            ),
        ]),
      ),
    );
  }
}

// ─── Hozzáadás gomb ──────────────────────────────────────────────────────────

class _AddPhotoButton extends StatelessWidget {
  final VoidCallback onCamera;
  final VoidCallback onGallery;

  const _AddPhotoButton({
    required this.onCamera,
    required this.onGallery,
  });

  @override
  Widget build(BuildContext context) {
    return GestureDetector(
      onTap: () => _showPicker(context),
      child: Container(
        width: 80,
        height: 80,
        decoration: BoxDecoration(
          color: Colors.grey.shade100,
          borderRadius: BorderRadius.circular(8),
          border: Border.all(
            color: Colors.grey.shade300,
            width: 1.5,
          ),
        ),
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Icon(Icons.add_a_photo_outlined,
                size: 24, color: Colors.grey.shade500),
            const SizedBox(height: 4),
            Text('Fotó',
                style: TextStyle(fontSize: 10, color: Colors.grey.shade500)),
          ],
        ),
      ),
    );
  }

  void _showPicker(BuildContext context) {
    showModalBottomSheet(
      context: context,
      builder: (_) => SafeArea(
        child: Column(mainAxisSize: MainAxisSize.min, children: [
          ListTile(
            leading: const Icon(Icons.camera_alt_outlined),
            title: const Text('Kamera'),
            onTap: () {
              Navigator.pop(context);
              onCamera();
            },
          ),
          ListTile(
            leading: const Icon(Icons.photo_library_outlined),
            title: const Text('Galéria'),
            onTap: () {
              Navigator.pop(context);
              onGallery();
            },
          ),
        ]),
      ),
    );
  }
}

// ─── Letiltott galéria (elem még nincs mentve) ───────────────────────────────

class _DisabledGallery extends StatelessWidget {
  const _DisabledGallery();

  @override
  Widget build(BuildContext context) {
    return Container(
      height: 50,
      alignment: Alignment.center,
      decoration: BoxDecoration(
        color: Colors.grey.shade100,
        borderRadius: BorderRadius.circular(8),
      ),
      child: Text(
        'Mentés után adhatók hozzá fotók',
        style: TextStyle(fontSize: 12, color: Colors.grey.shade500),
      ),
    );
  }
}

// ─── Teljes képernyős fotónézegető ───────────────────────────────────────────

class _PhotoViewerPage extends StatefulWidget {
  final List<NoteItemPhoto> photos;
  final int initialIndex;
  final ValueChanged<NoteItemPhoto> onCaptionSaved;

  const _PhotoViewerPage({
    required this.photos,
    required this.initialIndex,
    required this.onCaptionSaved,
  });

  @override
  State<_PhotoViewerPage> createState() => _PhotoViewerPageState();
}

class _PhotoViewerPageState extends State<_PhotoViewerPage> {
  late PageController _pageCtrl;
  late int _currentIdx;

  @override
  void initState() {
    super.initState();
    _currentIdx = widget.initialIndex;
    _pageCtrl = PageController(initialPage: widget.initialIndex);
  }

  @override
  void dispose() {
    _pageCtrl.dispose();
    super.dispose();
  }

  NoteItemPhoto get _current => widget.photos[_currentIdx];

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: Colors.black,
      appBar: AppBar(
        backgroundColor: Colors.black,
        foregroundColor: Colors.white,
        title: widget.photos.length > 1
            ? Text('${_currentIdx + 1} / ${widget.photos.length}')
            : null,
        actions: [
          // Felirat szerkesztés
          IconButton(
            icon: const Icon(Icons.edit_outlined, color: Colors.white),
            tooltip: 'Felirat szerkesztése',
            onPressed: _editCaption,
          ),
        ],
      ),
      body: Column(children: [
        // Fotó
        Expanded(
          child: PageView.builder(
            controller: _pageCtrl,
            itemCount: widget.photos.length,
            onPageChanged: (i) => setState(() => _currentIdx = i),
            itemBuilder: (_, i) {
              final photo = widget.photos[i];
              return InteractiveViewer(
                child: Center(
                  child: photo.fileExists
                      ? Image.file(photo.file, fit: BoxFit.contain)
                      : const Icon(Icons.broken_image,
                          color: Colors.white54, size: 64),
                ),
              );
            },
          ),
        ),

        // Felirat + helyadatok
        if (_current.caption.isNotEmpty || _current.location != null)
          Container(
            color: Colors.black.withOpacity(0.7),
            padding: EdgeInsets.fromLTRB(
              16,
              10,
              16,
              10 + MediaQuery.of(context).padding.bottom,
            ),
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              mainAxisSize: MainAxisSize.min,
              children: [
                if (_current.caption.isNotEmpty)
                  Text(_current.caption,
                      style:
                          const TextStyle(color: Colors.white, fontSize: 14)),
                if (_current.location != null)
                  Text(
                    '📍 ${_current.latitude!.toStringAsFixed(6)}, '
                    '${_current.longitude!.toStringAsFixed(6)}',
                    style: const TextStyle(color: Colors.white54, fontSize: 11),
                  ),
              ],
            ),
          ),
      ]),
    );
  }

  Future<void> _editCaption() async {
    final ctrl = TextEditingController(text: _current.caption);
    final result = await Get.dialog<String>(AlertDialog(
      title: const Text('Felirat'),
      content: TextField(
        controller: ctrl,
        decoration: const InputDecoration(
          hintText: 'Fotó leírása...',
        ),
        autofocus: true,
        maxLines: 3,
      ),
      actions: [
        TextButton(onPressed: Get.back, child: const Text('Mégse')),
        FilledButton(
          onPressed: () => Get.back(result: ctrl.text.trim()),
          child: const Text('Mentés'),
        ),
      ],
    ));

    if (result != null) {
      final updated = await NotePhotoService.to.updateCaption(_current, result);
      widget.onCaptionSaved(updated);
      setState(() {});
    }
  }
}