import 'package:dio/dio.dart';
import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import '../../app/theme.dart';
import '../../providers/session_provider.dart';
import '../../shared/api_client.dart';
import '../../shared/api_error.dart';
import '../../shared/models/match.dart';
import '../../shared/premium_dialog.dart';
import '../../shared/widgets/primary_cta.dart';
import '../../shared/widgets/screen_insets.dart';
import '../../shared/models/team.dart';
import '../matches/team_providers.dart';

class StepTransmission extends ConsumerStatefulWidget {
  const StepTransmission({
    super.key,
    required this.match,
    required this.onBack,
    required this.onNext,
  });

  final MatchModel match;
  final VoidCallback onBack;
  final VoidCallback onNext;

  @override
  ConsumerState<StepTransmission> createState() => _StepTransmissionState();
}

class _StepTransmissionState extends ConsumerState<StepTransmission> {
  String _platform = 'matchlivetv';
  String _privacy = 'public';
  String? _youtubeChannel;
  bool _creating = false;

  void _syncYoutubeChannel(Team? team) {
    if (team == null) {
      _youtubeChannel = null;
      return;
    }
    if (!team.canChooseYoutubeChannel) {
      if (team.youtubeTeamChannelAvailable) {
        _youtubeChannel = 'team';
      } else if (team.youtubePlatformAvailable) {
        _youtubeChannel = 'platform';
      } else {
        _youtubeChannel = null;
      }
      return;
    }
    _youtubeChannel ??= 'platform';
  }

  Future<void> _createSession() async {
    setState(() => _creating = true);
    try {
      final client = ref.read(apiClientProvider);
      final session = await client.createSession(
        widget.match.id,
        platform: _platform,
        youtubeChannel: _platform == 'youtube' ? _youtubeChannel : null,
        privacyStatus: _privacy,
        qualityPreset: '720p_30_2.5mbps',
        targetBitrate: 2500000,
        targetFps: 30,
      );
      ref.read(sessionProvider.notifier).setSession(session, match: widget.match);
      widget.onNext();
    } on DioException catch (e) {
      final apiErr = ApiException.fromDio(e);
      if (mounted) {
        if (apiErr?.isPremiumRequired == true) {
          await showPremiumRequiredDialog(
            context,
            message: apiErr!.message,
            billingUrl: apiErr.billingUrl,
          );
        } else {
          ScaffoldMessenger.of(context).showSnackBar(
            SnackBar(content: Text(apiErr?.message ?? 'Errore nella creazione sessione')),
          );
        }
      }
    } catch (_) {
      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          const SnackBar(content: Text('Errore nella creazione sessione')),
        );
      }
    } finally {
      if (mounted) setState(() => _creating = false);
    }
  }

  void _onYoutubeTap(Team? team) {
    if (team == null) return;
    if (team.isYoutubeReady) {
      setState(() {
        _platform = 'youtube';
        _syncYoutubeChannel(team);
      });
      return;
    }
    if (team.canUseYoutube) {
      ScaffoldMessenger.of(context).showSnackBar(
        const SnackBar(
          content: Text(
            'YouTube non è ancora disponibile. Riprova più tardi o usa Match Live TV sul sito.',
          ),
        ),
      );
      return;
    }
    showPremiumRequiredDialog(
      context,
      message: 'YouTube Live richiede Premium Light o Full.',
      billingUrl: team.billingUrl,
    );
  }

  String _youtubeSubtitle(Team? team) {
    if (team == null || !team.canUseYoutube) {
      return 'Premium Light o Full';
    }
    if (!team.isYoutubeReady) {
      return 'Canale Match Live TV (in attivazione)';
    }
    if (_platform == 'youtube' && team.canChooseYoutubeChannel) {
      return _youtubeChannel == 'team'
          ? 'Canale ${team.youtubeTeamChannelTitle ?? "società"}'
          : 'Canale Match Live TV';
    }
    if (team.youtubeUsesPlatformChannel || team.youtubePlatformAvailable) {
      final label = team.youtubeChannelTitle;
      return label != null ? 'Canale $label' : 'Canale Match Live TV';
    }
    final label = team.youtubeTeamChannelTitle ?? team.youtubeChannelTitle;
    return label != null ? 'Canale $label' : 'Canale società collegato';
  }

  @override
  Widget build(BuildContext context) {
    final theme = Theme.of(context);
    final teamAsync = ref.watch(teamByIdProvider(widget.match.teamId));

    return teamAsync.when(
      loading: () => const Center(child: CircularProgressIndicator(color: AppTheme.primaryRed)),
      error: (_, __) => const Center(child: Text('Errore caricamento squadra')),
      data: (team) {
        _syncYoutubeChannel(team);
        final youtubeSelectable = team != null && team.isYoutubeReady;
        final showYoutubeChannels =
            _platform == 'youtube' && team != null && team.canChooseYoutubeChannel;

        return SingleChildScrollView(
          padding: ScreenInsets.contentPadding(context, horizontal: 20, vertical: 12),
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.stretch,
            children: [
              if (team != null) ...[
                Container(
                  padding: const EdgeInsets.all(12),
                  decoration: BoxDecoration(
                    color: AppTheme.surfaceElevated,
                    borderRadius: BorderRadius.circular(10),
                    border: Border.all(color: AppTheme.primaryRed.withValues(alpha: 0.3)),
                  ),
                  child: Text(
                    'Piano ${team.planName} · Staff ${team.staffLimitLabel}'
                    '${team.concurrentStreamsLimit != null ? ' · Dirette ${team.concurrentStreamsUsed}/${team.concurrentStreamsLimit}' : ''}',
                    style: theme.textTheme.bodySmall,
                  ),
                ),
                const SizedBox(height: 12),
              ],
              Text('Piattaforma', style: theme.textTheme.titleLarge),
              const SizedBox(height: 12),
              _PlatformCard(
                title: 'Match Live TV',
                subtitle: 'Diretta sul nostro sito (incluso)',
                selected: _platform == 'matchlivetv',
                enabled: true,
                onTap: () => setState(() => _platform = 'matchlivetv'),
              ),
              const SizedBox(height: 8),
              _PlatformCard(
                title: 'YouTube Live',
                subtitle: _youtubeSubtitle(team),
                selected: _platform == 'youtube',
                enabled: youtubeSelectable,
                badge: team?.canUseYoutube == true ? null : 'Premium',
                onTap: () => _onYoutubeTap(team),
              ),
              if (showYoutubeChannels) ...[
                const SizedBox(height: 16),
                Text('Canale YouTube', style: theme.textTheme.titleMedium),
                const SizedBox(height: 8),
                _PlatformCard(
                  title: 'Match Live TV',
                  subtitle: 'Canale ufficiale della piattaforma',
                  selected: _youtubeChannel == 'platform',
                  enabled: true,
                  onTap: () => setState(() => _youtubeChannel = 'platform'),
                ),
                const SizedBox(height: 8),
                _PlatformCard(
                  title: team!.youtubeTeamChannelTitle ?? 'Canale società',
                  subtitle: 'Il tuo canale collegato',
                  selected: _youtubeChannel == 'team',
                  enabled: true,
                  onTap: () => setState(() => _youtubeChannel = 'team'),
                ),
              ],
              const SizedBox(height: 24),
              Text('Visibilità', style: theme.textTheme.titleLarge),
              const SizedBox(height: 8),
              Text(
                'Match Live TV e YouTube (canale nostro o società).',
                style: theme.textTheme.bodySmall,
              ),
              const SizedBox(height: 12),
              SegmentedButton<String>(
                segments: const [
                  ButtonSegment(
                    value: 'public',
                    label: Text('Pubblico'),
                    icon: Icon(Icons.public),
                  ),
                  ButtonSegment(
                    value: 'unlisted',
                    label: Text('Privato / non in elenco'),
                    icon: Icon(Icons.link),
                  ),
                ],
                selected: {_privacy},
                onSelectionChanged: (s) => setState(() => _privacy = s.first),
              ),
              const SizedBox(height: 8),
              Text(
                _privacy == 'public'
                    ? 'Compare nell\'elenco dirette e sul canale YouTube scelto.'
                    : 'Solo chi ha il link. Non in elenco pubblico né nelle ricerche.',
                style: theme.textTheme.bodySmall?.copyWith(color: AppTheme.textSecondary),
              ),
              const SizedBox(height: 24),
              Text('Qualità', style: theme.textTheme.titleLarge),
              const SizedBox(height: 12),
              Container(
                padding: const EdgeInsets.all(16),
                decoration: BoxDecoration(
                  color: AppTheme.surfaceElevated,
                  borderRadius: BorderRadius.circular(12),
                  border: Border.all(color: AppTheme.primaryRed.withValues(alpha: 0.4)),
                ),
                child: Row(
                  children: [
                    Expanded(
                      child: Column(
                        crossAxisAlignment: CrossAxisAlignment.start,
                        children: [
                          Text('720p · 30fps · 2.5 Mbps', style: theme.textTheme.titleMedium),
                          const SizedBox(height: 4),
                          Text(
                            'Bitrate fisso consigliato per reti instabili',
                            style: theme.textTheme.bodyMedium,
                          ),
                        ],
                      ),
                    ),
                    Container(
                      padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 4),
                      decoration: BoxDecoration(
                        color: AppTheme.primaryRed.withValues(alpha: 0.2),
                        borderRadius: BorderRadius.circular(6),
                      ),
                      child: Text(
                        'AUTO',
                        style: theme.textTheme.labelLarge?.copyWith(
                          color: AppTheme.primaryRed,
                          fontSize: 11,
                        ),
                      ),
                    ),
                  ],
                ),
              ),
              const SizedBox(height: 32),
              Row(
                children: [
                  Expanded(
                    child: OutlinedButton(
                      onPressed: _creating ? null : widget.onBack,
                      child: const Text('Indietro'),
                    ),
                  ),
                  const SizedBox(width: 12),
                  Expanded(
                    flex: 2,
                    child: PrimaryCta(
                      label: 'AVANTI >',
                      loading: _creating,
                      onPressed: _createSession,
                      icon: Icons.arrow_forward,
                    ),
                  ),
                ],
              ),
            ],
          ),
        );
      },
    );
  }
}

class _PlatformCard extends StatelessWidget {
  const _PlatformCard({
    required this.title,
    this.subtitle,
    required this.selected,
    required this.enabled,
    this.badge,
    this.onTap,
  });

  final String title;
  final String? subtitle;
  final bool selected;
  final bool enabled;
  final String? badge;
  final VoidCallback? onTap;

  @override
  Widget build(BuildContext context) {
    final theme = Theme.of(context);
    return Opacity(
      opacity: enabled ? 1 : 0.55,
      child: Material(
        color: Colors.transparent,
        child: InkWell(
          onTap: onTap,
          borderRadius: BorderRadius.circular(10),
          child: Container(
            padding: const EdgeInsets.all(14),
            decoration: BoxDecoration(
              color: selected
                  ? AppTheme.primaryRed.withValues(alpha: 0.15)
                  : AppTheme.surfaceElevated,
              borderRadius: BorderRadius.circular(10),
              border: Border.all(
                color: selected ? AppTheme.primaryRed : Colors.transparent,
              ),
            ),
            child: Row(
              children: [
                Icon(
                  selected ? Icons.radio_button_checked : Icons.radio_button_off,
                  color: selected ? AppTheme.primaryRed : AppTheme.textSecondary,
                ),
                const SizedBox(width: 12),
                Expanded(
                  child: Column(
                    crossAxisAlignment: CrossAxisAlignment.start,
                    children: [
                      Text(title, style: theme.textTheme.titleMedium),
                      if (subtitle != null)
                        Text(subtitle!, style: theme.textTheme.bodyMedium),
                    ],
                  ),
                ),
                if (badge != null)
                  Container(
                    padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 4),
                    decoration: BoxDecoration(
                      color: AppTheme.textSecondary.withValues(alpha: 0.2),
                      borderRadius: BorderRadius.circular(6),
                    ),
                    child: Text(badge!, style: theme.textTheme.labelSmall),
                  ),
              ],
            ),
          ),
        ),
      ),
    );
  }
}