// Bemért pontok listája:
//  - Pont neve + EOV Y/X
//  - Törlés swipe-pal
//  - CSV export (share_plus)
//  - SQLite alapú (nem memória)

import 'dart:convert';
import 'dart:io';

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

import '../controllers/map_survey_controller.dart';
import '../../../../../../models/measured_point.dart';
import '../../../../../../services/app_database.dart';
import '../../../../../../services/project_service.dart';

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

  @override
  State<MeasuredPointsSheet> createState() => _MeasuredPointsSheetState();
}

class _MeasuredPointsSheetState extends State<MeasuredPointsSheet> {
  List<MeasuredPoint> _points = [];
  bool _loading = true;

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

  Future<void> _load() async {
    final projectId = ProjectService.to.activeProjectId;
    if (projectId == null) {
      setState(() => _loading = false);
      return;
    }
    final pts = await AppDatabase.instance.listMeasuredPoints(projectId);
    if (mounted)
      setState(() {
        _points = pts;
        _loading = false;
      });
  }

  @override
  Widget build(BuildContext context) {
    final cs = Theme.of(context).colorScheme;

    return Container(
      decoration: BoxDecoration(
        color: cs.surface,
        borderRadius: const BorderRadius.vertical(top: Radius.circular(16)),
        boxShadow: [
          BoxShadow(
              color: Colors.black.withOpacity(0.15),
              blurRadius: 16,
              offset: const Offset(0, -4)),
        ],
      ),
      child: Column(
        children: [
          // ── Handle ───────────────────────────────────────────────
          Center(
            child: Container(
              margin: const EdgeInsets.symmetric(vertical: 10),
              width: 40,
              height: 4,
              decoration: BoxDecoration(
                  color: Colors.grey.shade300,
                  borderRadius: BorderRadius.circular(2)),
            ),
          ),

          // ── Fejléc ───────────────────────────────────────────────
          Padding(
            padding: const EdgeInsets.fromLTRB(20, 0, 12, 8),
            child: Row(children: [
              const Icon(Icons.location_on, size: 20),
              const SizedBox(width: 8),
              Text('Bemért pontok',
                  style: const TextStyle(
                      fontSize: 18, fontWeight: FontWeight.w600)),
              const SizedBox(width: 6),
              if (!_loading)
                Container(
                  padding:
                      const EdgeInsets.symmetric(horizontal: 7, vertical: 2),
                  decoration: BoxDecoration(
                    color: cs.primaryContainer,
                    borderRadius: BorderRadius.circular(10),
                  ),
                  child: Text('${_points.length}',
                      style: TextStyle(
                          fontSize: 12,
                          fontWeight: FontWeight.w600,
                          color: cs.onPrimaryContainer)),
                ),
              const Spacer(),
              // CSV export
              if (_points.isNotEmpty)
                IconButton(
                  icon: const Icon(Icons.download_outlined),
                  tooltip: 'CSV export',
                  onPressed: _exportCsv,
                ),
              // Összes törlése
              if (_points.isNotEmpty)
                IconButton(
                  icon: Icon(Icons.delete_sweep_outlined,
                      color: Colors.red.shade300),
                  tooltip: 'Összes törlése',
                  onPressed: _deleteAll,
                ),
            ]),
          ),

          const Divider(height: 1),

          // ── Lista ─────────────────────────────────────────────────
          Expanded(
            child: _loading
                ? const Center(child: CircularProgressIndicator())
                : _points.isEmpty
                    ? _emptyState()
                    : Column(children: [
                        // Fejléc sor
                        _TableHeader(),
                        const Divider(height: 1),
                        Expanded(
                          child: ListView.separated(
                            itemCount: _points.length,
                            separatorBuilder: (_, __) =>
                                const Divider(height: 1),
                            itemBuilder: (_, i) => _PointTile(
                              point: _points[i],
                              onDelete: () => _deleteOne(_points[i]),
                            ),
                          ),
                        ),
                      ]),
          ),

          // Alsó padding
          SizedBox(height: MediaQuery.of(context).padding.bottom + 8),
        ],
      ),
    );
  }

  // ── Törlés ────────────────────────────────────────────────────────

  Future<void> _deleteOne(MeasuredPoint pt) async {
    final ok = await Get.dialog<bool>(AlertDialog(
      title: const Text('Pont törlése'),
      content: Text('"${pt.name}" törlése visszavonohatalan.'),
      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) return;
    await AppDatabase.instance.deleteMeasuredPoint(pt.id!);
    setState(() => _points.remove(pt));

    // Controller marker listából is eltávolítjuk
    final ctrl = Get.find<MapSurveyController>();

    if (pt.latitude != null && pt.longitude != null) {
      ctrl.pointNotesMarker.removeWhere((m) =>
          (m.point.latitude - pt.latitude!).abs() < 1e-9 &&
          (m.point.longitude - pt.longitude!).abs() < 1e-9);
    }

    ctrl.pointWithDescriptionList
        .removeWhere((p) => p.pointId.toString() == pt.name);
  }

  Future<void> _deleteAll() async {
    final ok = await Get.dialog<bool>(AlertDialog(
      title: const Text('Összes pont törlése'),
      content: Text('${_points.length} pont törlése visszavonohatalan.'),
      actions: [
        TextButton(onPressed: Get.back, child: const Text('Mégse')),
        FilledButton(
          style: FilledButton.styleFrom(backgroundColor: Colors.red),
          onPressed: () => Get.back(result: true),
          child: const Text('Összes törlése'),
        ),
      ],
    ));
    if (ok != true) return;

    final projectId = ProjectService.to.activeProjectId;
    if (projectId != null) {
      await AppDatabase.instance.deleteAllMeasuredPoints(projectId);
    }
    final ctrl = Get.find<MapSurveyController>();
    ctrl.pointWithDescriptionList.clear();
    ctrl.pointNotesMarker.clear();

    setState(() => _points.clear());
  }

  // ── CSV export ────────────────────────────────────────────────────

  Future<void> _exportCsv() async {
    final buf = StringBuffer();
    buf.writeln(MeasuredPoint.csvHeader());
    for (final pt in _points) {
      buf.writeln(pt.toCsvRow());
    }

    final projectName =
        ProjectService.to.activeProject.value?.name ?? 'projekt';
    final ts =
        DateTime.now().toIso8601String().replaceAll(':', '-').substring(0, 16);
    final name = '${projectName}_bemert_pontok_$ts.csv';
    final dir = await getTemporaryDirectory();
    final file = File('${dir.path}/$name');
    await file.writeAsString(buf.toString(), encoding: utf8);
    await Share.shareXFiles(
      [XFile(file.path, mimeType: 'text/csv; charset=utf-8')],
      subject: 'Bemért pontok — $projectName',
    );
  }

  Widget _emptyState() => Center(
        child: Column(mainAxisSize: MainAxisSize.min, children: [
          Icon(Icons.location_off_outlined,
              size: 56, color: Colors.grey.shade300),
          const SizedBox(height: 12),
          Text('Még nincs bemért pont',
              style: TextStyle(color: Colors.grey.shade500)),
        ]),
      );
}

// ─── Fejléc sor ──────────────────────────────────────────────────────────────

class _TableHeader extends StatelessWidget {
  const _TableHeader();

  @override
  Widget build(BuildContext context) {
    final cs = Theme.of(context).colorScheme;
    final style = TextStyle(
        fontSize: 11, fontWeight: FontWeight.w600, color: cs.onSurfaceVariant);
    return Container(
      color: cs.surfaceContainerHighest,
      padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 6),
      child: Row(children: [
        SizedBox(width: 52, child: Text('Pont', style: style)),
        Expanded(child: Text('EOV Y', style: style)),
        Expanded(child: Text('EOV X', style: style)),
        SizedBox(
            width: 72,
            child: Text('Leírás', style: style, textAlign: TextAlign.center)),
        const SizedBox(width: 40), // törlés gomb helye
      ]),
    );
  }
}

// ─── Egy pont sor ────────────────────────────────────────────────────────────

class _PointTile extends StatelessWidget {
  final MeasuredPoint point;
  final VoidCallback onDelete;
  const _PointTile({required this.point, required this.onDelete});

  @override
  Widget build(BuildContext context) {
    final cs = Theme.of(context).colorScheme;
    final hasEov = point.eovY != null && point.eovX != null;
    final accColor = _accColor(point.accuracy);

    return Dismissible(
      key: ValueKey(point.id),
      direction: DismissDirection.endToStart,
      confirmDismiss: (_) async {
        onDelete();
        return false; // mi kezeljük a törlést
      },
      background: Container(
        color: Colors.red,
        alignment: Alignment.centerRight,
        padding: const EdgeInsets.only(right: 20),
        child: const Icon(Icons.delete, color: Colors.white),
      ),
      child: Padding(
        padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 10),
        child: Row(children: [
          // Pont neve
          SizedBox(
            width: 52,
            child: Text(point.name,
                style:
                    const TextStyle(fontWeight: FontWeight.w700, fontSize: 14),
                overflow: TextOverflow.ellipsis),
          ),
          // EOV Y
          Expanded(
            child: Text(
              hasEov ? point.eovY!.toStringAsFixed(1) : '–',
              style: const TextStyle(
                  fontSize: 13, fontFeatures: [FontFeature.tabularFigures()]),
            ),
          ),
          // EOV X
          Expanded(
            child: Text(
              hasEov ? point.eovX!.toStringAsFixed(1) : '–',
              style: const TextStyle(
                  fontSize: 13, fontFeatures: [FontFeature.tabularFigures()]),
            ),
          ),
          // Pontosság
          SizedBox(
            width: 72,
            child: Text(
              point.note.isEmpty ? '---' : point.note,
              style: TextStyle(
                fontSize: 12,
                color: point.note.isEmpty ? Colors.grey.shade400 : null,
              ),
              overflow: TextOverflow.ellipsis,
            ),
          ),
          // Törlés gomb
          SizedBox(
            width: 40,
            child: IconButton(
              icon: Icon(Icons.delete_outline,
                  size: 18, color: Colors.grey.shade400),
              onPressed: onDelete,
              padding: EdgeInsets.zero,
              constraints: const BoxConstraints(minWidth: 36, minHeight: 36),
            ),
          ),
        ]),
      ),
    );
  }

  Color _accColor(double? acc) {
    if (acc == null) return Colors.grey;
    if (acc <= 0.05) return Colors.green;
    if (acc <= 0.20) return Colors.lightGreen.shade700;
    if (acc <= 1.00) return Colors.orange;
    return Colors.red;
  }
}