import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import '../../../../core/di/injection.dart';
import '../../domain/entities/compliance_snapshot.dart';
import '../bloc/compliance_bloc.dart';

/// Page tableau de bord de conformité — affiche le snapshot agrégé pour
/// l'organisation active du membre connecté.
///
/// Cible : Compliance Officer, Contrôleur Interne, Président, Trésorier, Admin Org.
class ConformiteDashboardPage extends StatelessWidget {
  const ConformiteDashboardPage({super.key});

  @override
  Widget build(BuildContext context) {
    return BlocProvider(
      create: (_) => getIt<ComplianceBloc>()..add(const LoadComplianceSnapshot()),
      child: Scaffold(
        appBar: AppBar(
          title: const Text('Conformité'),
          actions: [
            Builder(
              builder: (ctx) => IconButton(
                icon: const Icon(Icons.refresh),
                onPressed: () =>
                    ctx.read<ComplianceBloc>().add(const RefreshComplianceSnapshot()),
              ),
            ),
          ],
        ),
        body: BlocBuilder<ComplianceBloc, ComplianceState>(
          builder: (context, state) {
            if (state is ComplianceLoading || state is ComplianceInitial) {
              return const Center(child: CircularProgressIndicator());
            }
            if (state is ComplianceError) {
              return _Error(message: state.message);
            }
            if (state is ComplianceLoaded) {
              return _Content(snapshot: state.snapshot);
            }
            return const SizedBox.shrink();
          },
        ),
      ),
    );
  }
}

class _Content extends StatelessWidget {
  final ComplianceSnapshot snapshot;
  const _Content({required this.snapshot});

  @override
  Widget build(BuildContext context) {
    return SingleChildScrollView(
      padding: const EdgeInsets.all(16),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.stretch,
        children: [
          _ScoreCard(snapshot: snapshot),
          const SizedBox(height: 16),
          _IndicateurTile(
            label: 'Compliance Officer',
            value: snapshot.complianceOfficerDesigne ? 'Désigné' : 'ABSENT',
            severite: snapshot.complianceOfficerDesigne ? 'success' : 'danger',
          ),
          _IndicateurTile(
            label: 'AG annuelle',
            value: snapshot.agAnnuelle.statut,
            sous: snapshot.agAnnuelle.message,
            severite: _statutSeverite(snapshot.agAnnuelle.statut),
          ),
          _IndicateurTile(
            label: 'Rapport AIRMS',
            value: snapshot.rapportAirms.statut,
            severite: _statutSeverite(snapshot.rapportAirms.statut),
          ),
          _IndicateurTile(
            label: 'Dirigeants enrôlés CMU',
            value: snapshot.dirigeantsAvecCmu.toString(),
            severite: snapshot.dirigeantsAvecCmu >= 3 ? 'success' : 'warning',
          ),
          _IndicateurTile(
            label: 'Taux KYC à jour',
            value: '${snapshot.tauxKycAJourPct.toStringAsFixed(1)} %',
          ),
          _IndicateurTile(
            label: 'Taux formation LBC/FT',
            value: '${snapshot.tauxFormationLbcFtPct.toStringAsFixed(1)} %',
          ),
          _IndicateurTile(
            label: 'Couverture UBO',
            value: '${snapshot.couvertureUboPct.toStringAsFixed(1)} %',
          ),
          _IndicateurTile(
            label: 'Commissaire aux comptes',
            value: snapshot.commissaireAuxComptes.statut,
            sous: snapshot.commissaireAuxComptes.message,
          ),
          _IndicateurTile(
            label: 'FOMUS-CI',
            value: snapshot.fomusCi.statut,
            sous: snapshot.fomusCi.message,
          ),
          if (snapshot.hasAlertesCritiques) ...[
            const SizedBox(height: 16),
            _AlertesCard(snapshot: snapshot),
          ],
        ],
      ),
    );
  }

  String _statutSeverite(String s) {
    if (s == 'OK') return 'success';
    if (s == 'RETARD') return 'danger';
    return 'warning';
  }
}

class _ScoreCard extends StatelessWidget {
  final ComplianceSnapshot snapshot;
  const _ScoreCard({required this.snapshot});

  @override
  Widget build(BuildContext context) {
    final color = _color(snapshot.scoreSeverite);
    return Card(
      elevation: 2,
      child: Padding(
        padding: const EdgeInsets.all(20),
        child: Column(
          children: [
            Text(snapshot.organisationNom,
                style: Theme.of(context).textTheme.titleLarge,
                textAlign: TextAlign.center),
            const SizedBox(height: 4),
            Text('Référentiel : ${snapshot.referentielComptable}',
                style: Theme.of(context).textTheme.bodySmall),
            const SizedBox(height: 16),
            Text('Score conformité',
                style: Theme.of(context).textTheme.bodyLarge),
            const SizedBox(height: 8),
            Text(
              '${snapshot.scoreGlobal} / 100',
              style: TextStyle(
                fontSize: 48,
                fontWeight: FontWeight.bold,
                color: color,
              ),
            ),
          ],
        ),
      ),
    );
  }

  Color _color(String s) => switch (s) {
        'success' => Colors.green,
        'warning' => Colors.orange,
        'danger' => Colors.red,
        _ => Colors.grey,
      };
}

class _IndicateurTile extends StatelessWidget {
  final String label;
  final String value;
  final String? sous;
  final String? severite;
  const _IndicateurTile({
    required this.label,
    required this.value,
    this.sous,
    this.severite,
  });

  @override
  Widget build(BuildContext context) {
    final color = severite != null ? _color(severite!) : Colors.grey;
    return Card(
      child: ListTile(
        title: Text(label),
        subtitle: sous != null ? Text(sous!, maxLines: 2, overflow: TextOverflow.ellipsis) : null,
        trailing: Container(
          padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 6),
          decoration: BoxDecoration(
            color: color.withValues(alpha: 0.15),
            borderRadius: BorderRadius.circular(20),
          ),
          child: Text(
            value,
            style: TextStyle(color: color, fontWeight: FontWeight.bold),
          ),
        ),
      ),
    );
  }

  Color _color(String s) => switch (s) {
        'success' => Colors.green,
        'warning' => Colors.orange,
        'danger' => Colors.red,
        _ => Colors.grey,
      };
}

class _AlertesCard extends StatelessWidget {
  final ComplianceSnapshot snapshot;
  const _AlertesCard({required this.snapshot});

  @override
  Widget build(BuildContext context) {
    final alertes = <String>[];
    if (!snapshot.complianceOfficerDesigne) {
      alertes.add('Compliance Officer non désigné (Instr. BCEAO 001-03-2025)');
    }
    if (snapshot.agAnnuelle.statut == 'RETARD') {
      alertes.add('AG annuelle en retard (échéance 30/06)');
    }
    if (snapshot.scoreGlobal < 60) {
      alertes.add('Score conformité < 60 % — risque inspection');
    }

    return Card(
      color: Colors.red.shade50,
      child: Padding(
        padding: const EdgeInsets.all(16),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Row(children: [
              const Icon(Icons.warning, color: Colors.red),
              const SizedBox(width: 8),
              Text('Alertes critiques',
                  style: Theme.of(context).textTheme.titleMedium),
            ]),
            const SizedBox(height: 8),
            for (final a in alertes)
              Padding(
                padding: const EdgeInsets.symmetric(vertical: 2),
                child: Text('• $a', style: const TextStyle(color: Colors.red)),
              ),
          ],
        ),
      ),
    );
  }
}

class _Error extends StatelessWidget {
  final String message;
  const _Error({required this.message});

  @override
  Widget build(BuildContext context) {
    return Center(
      child: Padding(
        padding: const EdgeInsets.all(24),
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            const Icon(Icons.error_outline, color: Colors.red, size: 48),
            const SizedBox(height: 16),
            Text(
              'Impossible de charger le tableau de bord',
              style: Theme.of(context).textTheme.titleMedium,
              textAlign: TextAlign.center,
            ),
            const SizedBox(height: 8),
            Text(message,
                style: Theme.of(context).textTheme.bodySmall,
                textAlign: TextAlign.center),
          ],
        ),
      ),
    );
  }
}