import 'dart:io';

import 'package:file_picker/file_picker.dart';
import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:go_router/go_router.dart';
import 'package:path/path.dart' as p;
import 'package:path_provider/path_provider.dart';

import '../../durum/proje_durumu.dart';
import '../../servisler/csv_toplu_import.dart';
import '../../servisler/proje_deposu.dart';
import '../../servisler/proje_export_import.dart';
import '../proje_olustur/yeni_proje_dialog.dart';

class ProjelerSayfasi extends ConsumerWidget {
  const ProjelerSayfasi({super.key});

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final liste = ref.watch(projelerListesiProvider);
    return Padding(
      padding: const EdgeInsets.all(24),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Row(
            children: [
              Text('Projeler', style: Theme.of(context).textTheme.headlineMedium),
              const Spacer(),
              OutlinedButton.icon(
                icon: const Icon(Icons.upload_file, size: 16),
                label: const Text('İçe aktar'),
                onPressed: () => _iceAktar(context, ref),
              ),
              const SizedBox(width: 8),
              OutlinedButton.icon(
                icon: const Icon(Icons.list_alt, size: 16),
                label: const Text('CSV toplu'),
                onPressed: () => _csvToplu(context, ref),
              ),
              const SizedBox(width: 8),
              FilledButton.icon(
                icon: const Icon(Icons.add),
                label: const Text('Yeni Proje'),
                onPressed: () => showDialog(
                  context: context,
                  builder: (_) => const YeniProjeDialog(),
                ),
              ),
            ],
          ),
          const SizedBox(height: 16),
          Expanded(
            child: liste.when(
              data: (l) {
                if (l.isEmpty) {
                  return const Center(
                    child: Text('Henüz proje yok. "Yeni Proje" ile başla.'),
                  );
                }
                return ListView.separated(
                  itemCount: l.length,
                  separatorBuilder: (_, __) => const SizedBox(height: 8),
                  itemBuilder: (ctx, i) {
                    final o = l[i];
                    return Card(
                      child: ListTile(
                        leading: const Icon(Icons.movie),
                        title: Text(o.isim),
                        subtitle: Text(
                          '${o.klasorYolu}\nGüncellendi: ${o.guncellendi.toLocal()}',
                        ),
                        isThreeLine: true,
                        onTap: () async {
                          final p = await ProjeDeposu.yukle(o.klasorYolu);
                          if (p != null) {
                            ref.read(projeProvider.notifier).ayarla(p);
                            if (ctx.mounted) ctx.go('/studyo');
                          }
                        },
                        trailing: Row(
                          mainAxisSize: MainAxisSize.min,
                          children: [
                            IconButton(
                              icon: const Icon(Icons.archive_outlined),
                              tooltip: 'Dışa aktar (.fikoproj)',
                              onPressed: () => _disaAktar(ctx, o),
                            ),
                            IconButton(
                          icon: const Icon(Icons.delete_outline),
                          onPressed: () async {
                            final onay = await showDialog<bool>(
                              context: ctx,
                              builder: (dialogCtx) => AlertDialog(
                                title: const Text('Projeyi sil?'),
                                content: const Text(
                                  'Disk klasörü dahil tamamen silinecek.',
                                ),
                                actions: [
                                  TextButton(
                                    onPressed: () =>
                                        Navigator.pop(dialogCtx, false),
                                    child: const Text('İptal'),
                                  ),
                                  FilledButton(
                                    onPressed: () =>
                                        Navigator.pop(dialogCtx, true),
                                    child: const Text('Sil'),
                                  ),
                                ],
                              ),
                            );
                            if (onay == true) {
                              // Aktif proje silinen ise state'i temizle —
                              // aksi halde studyo widget'ları silinmiş bir
                              // projeye referans tutar.
                              final aktif = ref.read(projeProvider);
                              final aktifSiliniyor = aktif?.id == o.id;
                              if (aktifSiliniyor) {
                                ref.read(projeProvider.notifier).temizle();
                                // Video player ve dosya handle'larının
                                // serbest bırakılması için kısa bekleme
                                await Future.delayed(
                                    const Duration(milliseconds: 250));
                              }
                              try {
                                await ProjeDeposu.sil(o.id);
                              } catch (e) {
                                if (ctx.mounted) {
                                  ScaffoldMessenger.of(ctx).showSnackBar(
                                    SnackBar(
                                      backgroundColor: Colors.red.shade700,
                                      content: Text(
                                        'Silme hatası (dosya kullanımda olabilir): $e',
                                        style: const TextStyle(color: Colors.white),
                                      ),
                                    ),
                                  );
                                }
                              }
                              ref.invalidate(projelerListesiProvider);
                            }
                          },
                        ),
                          ],
                        ),
                      ),
                    );
                  },
                );
              },
              loading: () => const Center(child: CircularProgressIndicator()),
              error: (e, _) => Text('Hata: $e'),
            ),
          ),
        ],
      ),
    );
  }

  Future<void> _disaAktar(BuildContext context, ProjeOzeti o) async {
    final result = await FilePicker.platform.saveFile(
      dialogTitle: 'Projeyi dışa aktar',
      fileName: '${o.isim.replaceAll(RegExp(r"[^\w-]"), "_")}.fikoproj',
      type: FileType.custom,
      allowedExtensions: ['fikoproj'],
    );
    if (result == null) return;
    final proje = await ProjeDeposu.yukle(o.klasorYolu);
    if (proje == null) return;
    if (!context.mounted) return;
    showDialog(
      context: context,
      barrierDismissible: false,
      builder: (_) => const Center(child: CircularProgressIndicator()),
    );
    try {
      await ProjeExportImport.disaAktar(
        proje: proje,
        hedefZipYolu: result,
      );
      if (context.mounted) {
        Navigator.pop(context); // progress
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(content: Text('Dışa aktarıldı: $result')),
        );
      }
    } catch (e) {
      if (context.mounted) {
        Navigator.pop(context);
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(content: Text('Hata: $e'), backgroundColor: Colors.red),
        );
      }
    }
  }

  Future<void> _iceAktar(BuildContext context, WidgetRef ref) async {
    final r = await FilePicker.platform.pickFiles(
      type: FileType.custom,
      allowedExtensions: ['fikoproj', 'zip'],
    );
    if (r == null || r.files.single.path == null) return;
    final docs = await getApplicationDocumentsDirectory();
    final hedef = p.join(docs.path, 'FikoYT-VideoStudyo', 'projeler');
    if (!context.mounted) return;
    showDialog(
      context: context,
      barrierDismissible: false,
      builder: (_) => const Center(child: CircularProgressIndicator()),
    );
    try {
      final proje = await ProjeExportImport.iceAktar(
        zipYolu: r.files.single.path!,
        hedefKokKlasor: hedef,
      );
      if (context.mounted) {
        Navigator.pop(context);
        ref.invalidate(projelerListesiProvider);
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(
            content: Text(proje != null
                ? 'İçe aktarıldı: ${proje.isim}'
                : 'Hata: proje.json yok'),
          ),
        );
      }
    } catch (e) {
      if (context.mounted) {
        Navigator.pop(context);
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(content: Text('Hata: $e'), backgroundColor: Colors.red),
        );
      }
    }
  }

  Future<void> _csvToplu(BuildContext context, WidgetRef ref) async {
    await showDialog(
      context: context,
      builder: (ctx) => AlertDialog(
        title: const Text('CSV Toplu İçe Aktar'),
        content: SizedBox(
          width: 480,
          child: Column(
            mainAxisSize: MainAxisSize.min,
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              const Text(
                'CSV formatı (UTF-8):',
                style: TextStyle(fontWeight: FontWeight.bold),
              ),
              const SizedBox(height: 4),
              Container(
                padding: const EdgeInsets.all(8),
                decoration: BoxDecoration(
                  color: Theme.of(ctx).colorScheme.surfaceContainerHighest,
                  borderRadius: BorderRadius.circular(4),
                ),
                child: const SelectableText(
                  'proje_ismi,ses_dosyasi,gorsel_dosyasi,prompt,segment_suresi,cozunurluk,oran\n'
                  'Klip1,C:/sarki1.mp3,C:/img1.png,cinematic dawn,20,540p,16:9\n'
                  'Klip2,,,prompt only,10,720p,9:16',
                  style: TextStyle(fontSize: 10, fontFamily: 'monospace'),
                ),
              ),
              const SizedBox(height: 12),
              Row(
                children: [
                  OutlinedButton.icon(
                    icon: const Icon(Icons.copy, size: 14),
                    label: const Text('Şablon kopyala'),
                    onPressed: () {
                      // Could copy to clipboard
                    },
                  ),
                  const Spacer(),
                  FilledButton.icon(
                    icon: const Icon(Icons.upload_file, size: 14),
                    label: const Text('CSV seç'),
                    onPressed: () async {
                      final r = await FilePicker.platform.pickFiles(
                        type: FileType.custom,
                        allowedExtensions: ['csv'],
                      );
                      if (r == null || r.files.single.path == null) return;
                      final satirlar =
                          await CsvTopluImport.oku(r.files.single.path!);
                      if (!ctx.mounted) return;
                      Navigator.pop(ctx);
                      _csvIslemBaslat(context, ref, satirlar);
                    },
                  ),
                ],
              ),
            ],
          ),
        ),
        actions: [
          TextButton(
            onPressed: () => Navigator.pop(ctx),
            child: const Text('Kapat'),
          ),
        ],
      ),
    );
  }

  Future<void> _csvIslemBaslat(
    BuildContext context,
    WidgetRef ref,
    List<CsvSatiri> satirlar,
  ) async {
    if (satirlar.isEmpty) {
      ScaffoldMessenger.of(context).showSnackBar(
        const SnackBar(content: Text('CSV boş veya format hatalı')),
      );
      return;
    }
    final ilerlemeNotifier = ValueNotifier<String>('Başlatılıyor...');
    showDialog(
      context: context,
      barrierDismissible: false,
      builder: (_) => AlertDialog(
        title: Text('${satirlar.length} proje oluşturuluyor'),
        content: ValueListenableBuilder<String>(
          valueListenable: ilerlemeNotifier,
          builder: (c, v, _) => Column(
            mainAxisSize: MainAxisSize.min,
            children: [
              const LinearProgressIndicator(),
              const SizedBox(height: 8),
              Text(v, style: const TextStyle(fontSize: 12)),
            ],
          ),
        ),
      ),
    );
    final sonuc = await CsvTopluImport.projeleriOlustur(
      satirlar: satirlar,
      ilerleme: (i, t, ad) {
        ilerlemeNotifier.value = '$i/$t · $ad';
      },
    );
    if (context.mounted) {
      Navigator.pop(context);
      ref.invalidate(projelerListesiProvider);
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(content: Text('${sonuc.length} proje oluşturuldu')),
      );
    }
  }
}