import 'dart:io';

import 'package:dio/dio.dart';
import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:path/path.dart' as p;

import '../app/tema.dart';
import '../cekirdek/sabitler.dart';
import 'model_registry.dart';
import 'model_servisi.dart';

class ModelEkrani extends ConsumerStatefulWidget {
  const ModelEkrani({super.key});

  @override
  ConsumerState<ModelEkrani> createState() => _ModelEkraniState();
}

class _ModelEkraniState extends ConsumerState<ModelEkrani> {
  // url → indirme oranı (0-1)
  final Map<String, double> _indiriliyor = {};
  final Map<String, CancelToken> _iptaller = {};

  Map<String, Set<String>> _kuruluHarita = {};

  String _yerelYol(ModelKaydi m) =>
      p.join(Sabitler.comfyModelsKlasoru, m.klasor, m.dosyaAdi);

  bool _kurulu(ModelKaydi m) {
    // 1) ComfyUI'nin gerçek listesinde var mı (basename eşleşmesi)
    final set = _kuruluHarita[m.klasor];
    if (set != null && set.contains(m.dosyaAdi.toLowerCase())) return true;
    // 2) Dosya yolu fallback
    return File(_yerelYol(m)).existsSync();
  }

  Future<void> _indir(ModelKaydi m) async {
    final hedef = _yerelYol(m);
    await Directory(p.dirname(hedef)).create(recursive: true);
    final iptal = CancelToken();
    setState(() {
      _indiriliyor[m.url] = 0;
      _iptaller[m.url] = iptal;
    });
    try {
      final dio = Dio();
      await dio.download(
        m.url,
        hedef,
        cancelToken: iptal,
        options: Options(followRedirects: true, maxRedirects: 6),
        onReceiveProgress: (a, b) {
          if (b > 0 && mounted) setState(() => _indiriliyor[m.url] = a / b);
        },
      );
      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
            SnackBar(content: Text('${m.ad} indirildi ✓')));
      }
    } catch (e) {
      // İptal değilse hata göster, yarım dosyayı sil
      if (iptal.isCancelled) {
        File(hedef).existsSync() ? File(hedef).deleteSync() : null;
      } else if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
            SnackBar(content: Text('${m.ad} indirilemedi')));
      }
    } finally {
      if (mounted) {
        setState(() {
          _indiriliyor.remove(m.url);
          _iptaller.remove(m.url);
        });
      }
    }
  }

  @override
  Widget build(BuildContext context) {
    final gruplu = ModelRegistry.gruplu;
    final kuruluAsync = ref.watch(kuruluModellerProvider);
    _kuruluHarita = kuruluAsync.value ?? {};
    final toplamKurulu =
        _kuruluHarita.values.fold<int>(0, (a, s) => a + s.length);
    return Padding(
      padding: const EdgeInsets.fromLTRB(12, 10, 12, 8),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Row(
            children: [
              const Icon(Icons.download_for_offline,
                  color: FikoRenkler.neonCyan, size: 20),
              const SizedBox(width: 8),
              const Text('Model Yöneticisi',
                  style:
                      TextStyle(fontSize: 15, fontWeight: FontWeight.w800)),
              const SizedBox(width: 12),
              if (kuruluAsync.isLoading)
                const SizedBox(
                    width: 13,
                    height: 13,
                    child: CircularProgressIndicator(strokeWidth: 2))
              else
                Text('ComfyUI\'de kurulu: $toplamKurulu model',
                    style: const TextStyle(
                        fontSize: 12, color: FikoRenkler.neonYesil)),
              const Spacer(),
              IconButton(
                tooltip: 'Kurulu listesini yenile',
                icon: const Icon(Icons.refresh, size: 18),
                onPressed: () => ref.invalidate(kuruluModellerProvider),
              ),
            ],
          ),
          const SizedBox(height: 10),
          Expanded(
            child: ListView(
              children: [
                for (final giris in gruplu.entries) ...[
                  Padding(
                    padding: const EdgeInsets.only(top: 6, bottom: 6),
                    child: Row(children: [
                      Container(
                        width: 4,
                        height: 16,
                        decoration: BoxDecoration(
                            color: FikoRenkler.neonMor,
                            borderRadius: BorderRadius.circular(2)),
                      ),
                      const SizedBox(width: 8),
                      Text(giris.key,
                          style: const TextStyle(
                              fontSize: 13.5, fontWeight: FontWeight.w800)),
                    ]),
                  ),
                  for (final m in giris.value) _modelSatir(m),
                ],
              ],
            ),
          ),
        ],
      ),
    );
  }

  Widget _modelSatir(ModelKaydi m) {
    final kurulu = _kurulu(m);
    final oran = _indiriliyor[m.url];
    return Container(
      margin: const EdgeInsets.only(bottom: 6),
      padding: const EdgeInsets.symmetric(horizontal: 10, vertical: 8),
      decoration: BoxDecoration(
        color: Theme.of(context).colorScheme.surface,
        borderRadius: BorderRadius.circular(9),
        border: Border.all(
            color: kurulu
                ? FikoRenkler.neonYesil.withValues(alpha: 0.4)
                : Theme.of(context).dividerColor),
      ),
      child: Row(
        children: [
          Expanded(
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Row(children: [
                  Flexible(
                    child: Text(m.ad,
                        maxLines: 1,
                        overflow: TextOverflow.ellipsis,
                        style: const TextStyle(
                            fontSize: 12.5, fontWeight: FontWeight.w600)),
                  ),
                  const SizedBox(width: 6),
                  if (m.zorunlu)
                    const _Mini('zorunlu', FikoRenkler.neonAmber),
                  if (m.boyutGb > 0)
                    _Mini('${m.boyutGb} GB', FikoRenkler.neonCyan),
                ]),
                if (m.aciklama.isNotEmpty)
                  Text(m.aciklama,
                      style: TextStyle(
                          fontSize: 10,
                          color: Theme.of(context)
                              .colorScheme
                              .onSurface
                              .withValues(alpha: 0.5))),
                Text('${m.klasor}/${m.dosyaAdi}',
                    maxLines: 1,
                    overflow: TextOverflow.ellipsis,
                    style: TextStyle(
                        fontSize: 9,
                        color: Theme.of(context)
                            .colorScheme
                            .onSurface
                            .withValues(alpha: 0.35))),
              ],
            ),
          ),
          const SizedBox(width: 10),
          SizedBox(
            width: 150,
            child: oran != null
                ? Row(children: [
                    Expanded(
                        child: LinearProgressIndicator(
                            value: oran == 0 ? null : oran)),
                    const SizedBox(width: 6),
                    Text('%${(oran * 100).round()}',
                        style: const TextStyle(fontSize: 10)),
                    IconButton(
                      visualDensity: VisualDensity.compact,
                      icon: const Icon(Icons.close, size: 15),
                      onPressed: () => _iptaller[m.url]?.cancel(),
                    ),
                  ])
                : kurulu
                    ? Row(
                        mainAxisAlignment: MainAxisAlignment.end,
                        children: const [
                          Icon(Icons.check_circle,
                              size: 16, color: FikoRenkler.neonYesil),
                          SizedBox(width: 4),
                          Text('Kurulu',
                              style: TextStyle(
                                  fontSize: 11,
                                  color: FikoRenkler.neonYesil)),
                        ],
                      )
                    : FilledButton.icon(
                        style: FilledButton.styleFrom(
                            visualDensity: VisualDensity.compact),
                        icon: const Icon(Icons.download, size: 15),
                        label: const Text('İndir',
                            style: TextStyle(fontSize: 11.5)),
                        onPressed: () => _indir(m),
                      ),
          ),
        ],
      ),
    );
  }
}

class _Mini extends StatelessWidget {
  const _Mini(this.metin, this.renk);
  final String metin;
  final Color renk;

  @override
  Widget build(BuildContext context) {
    return Container(
      margin: const EdgeInsets.only(right: 4),
      padding: const EdgeInsets.symmetric(horizontal: 5, vertical: 1),
      decoration: BoxDecoration(
          color: renk.withValues(alpha: 0.15),
          borderRadius: BorderRadius.circular(4)),
      child: Text(metin, style: TextStyle(fontSize: 9, color: renk)),
    );
  }
}