import 'package:flutter/material.dart';
import 'package:get_it/get_it.dart';

import '../../data/models/compte_epargne_model.dart';
import '../../data/models/transaction_epargne_model.dart';
import '../../data/repositories/transaction_epargne_repository.dart';
import '../../../../shared/design_system/unionflow_design_system.dart';

/// Bottom sheet affichant l'historique complet des transactions d'un compte (charge et rafraîchit les données).
class HistoriqueEpargneSheet extends StatefulWidget {
  final CompteEpargneModel compte;

  const HistoriqueEpargneSheet({
    super.key,
    required this.compte,
  });

  @override
  State<HistoriqueEpargneSheet> createState() => _HistoriqueEpargneSheetState();
}

class _HistoriqueEpargneSheetState extends State<HistoriqueEpargneSheet> {
  List<TransactionEpargneModel> _transactions = [];
  bool _loading = true;
  String? _error;

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

  Future<void> _load() async {
    if (widget.compte.id == null) {
      setState(() {
        _loading = false;
        _transactions = [];
      });
      return;
    }
    setState(() {
      _loading = true;
      _error = null;
    });
    try {
      final repo = GetIt.I<TransactionEpargneRepository>();
      final list = await repo.getByCompte(widget.compte.id!);
      if (!mounted) return;
      setState(() {
        _transactions = list.map((e) => TransactionEpargneModel.fromJson(e)).toList();
        _loading = false;
        _error = null;
      });
    } catch (e) {
      if (!mounted) return;
      setState(() {
        _transactions = [];
        _loading = false;
        _error = e.toString().replaceFirst('Exception: ', '');
      });
    }
  }

  String _libelleType(String? type) {
    if (type == null) return '—';
    const map = {
      'DEPOT': 'Dépôt',
      'RETRAIT': 'Retrait',
      'TRANSFERT_ENTRANT': 'Virement reçu',
      'TRANSFERT_SORTANT': 'Virement envoyé',
    };
    return map[type] ?? type;
  }

  @override
  Widget build(BuildContext context) {
    final compte = widget.compte;
    return DraggableScrollableSheet(
      initialChildSize: 0.6,
      minChildSize: 0.3,
      maxChildSize: 0.95,
      expand: false,
      builder: (context, scrollController) {
        return Column(
          children: [
            Container(
              margin: const EdgeInsets.only(top: 12, bottom: 8),
              width: 40,
              height: 4,
              decoration: BoxDecoration(
                color: ColorTokens.onSurfaceVariant.withOpacity(0.4),
                borderRadius: BorderRadius.circular(2),
              ),
            ),
            Padding(
              padding: const EdgeInsets.symmetric(horizontal: SpacingTokens.lg),
              child: Row(
                mainAxisAlignment: MainAxisAlignment.spaceBetween,
                children: [
                  Text(
                    'Historique — ${compte.numeroCompte ?? compte.id}',
                    style: TypographyTokens.titleMedium,
                  ),
                  IconButton(
                    icon: _loading ? const SizedBox(
                      width: 24,
                      height: 24,
                      child: CircularProgressIndicator(strokeWidth: 2),
                    ) : const Icon(Icons.refresh),
                    onPressed: _loading ? null : _load,
                    tooltip: 'Actualiser',
                  ),
                ],
              ),
            ),
            const SizedBox(height: 8),
            Expanded(
              child: _loading
                  ? const Center(child: CircularProgressIndicator())
                  : _error != null
                      ? Center(
                          child: Padding(
                            padding: const EdgeInsets.all(SpacingTokens.lg),
                            child: Column(
                              mainAxisSize: MainAxisSize.min,
                              children: [
                                Text(_error!, style: TextStyle(color: ColorTokens.error), textAlign: TextAlign.center),
                                const SizedBox(height: SpacingTokens.md),
                                FilledButton.tonal(onPressed: _load, child: const Text('Réessayer')),
                              ],
                            ),
                          ),
                        )
                      : _transactions.isEmpty
                          ? Center(
                              child: Text(
                                'Aucune transaction',
                                style: TypographyTokens.bodySmall.copyWith(color: ColorTokens.onSurfaceVariant),
                              ),
                            )
                          : ListView.builder(
                              controller: scrollController,
                              padding: const EdgeInsets.symmetric(horizontal: SpacingTokens.lg, vertical: SpacingTokens.sm),
                              itemCount: _transactions.length,
                              itemBuilder: (context, index) {
                                final t = _transactions[index];
                                return Card(
                                  margin: const EdgeInsets.only(bottom: SpacingTokens.sm),
                                  child: ListTile(
                                    leading: CircleAvatar(
                                      backgroundColor: t.isCredit
                                          ? ColorTokens.success.withOpacity(0.2)
                                          : ColorTokens.error.withOpacity(0.2),
                                      child: Icon(
                                        t.isCredit ? Icons.arrow_downward : Icons.arrow_upward,
                                        color: t.isCredit ? ColorTokens.success : ColorTokens.error,
                                        size: 20,
                                      ),
                                    ),
                                    title: Text(
                                      _libelleType(t.type),
                                      style: TypographyTokens.bodyMedium,
                                    ),
                                    subtitle: Column(
                                      crossAxisAlignment: CrossAxisAlignment.start,
                                      children: [
                                        if (t.dateTransaction != null)
                                          Text(
                                            '${t.dateTransaction!.day.toString().padLeft(2, '0')}/${t.dateTransaction!.month.toString().padLeft(2, '0')}/${t.dateTransaction!.year} ${t.dateTransaction!.hour.toString().padLeft(2, '0')}:${t.dateTransaction!.minute.toString().padLeft(2, '0')}',
                                            style: TypographyTokens.bodySmall.copyWith(color: ColorTokens.onSurfaceVariant),
                                          ),
                                        if (t.motif != null && t.motif!.isNotEmpty)
                                          Text(
                                            t.motif!,
                                            style: TypographyTokens.bodySmall.copyWith(color: ColorTokens.onSurfaceVariant),
                                            maxLines: 1,
                                            overflow: TextOverflow.ellipsis,
                                          ),
                                      ],
                                    ),
                                    trailing: Column(
                                      mainAxisAlignment: MainAxisAlignment.center,
                                      crossAxisAlignment: CrossAxisAlignment.end,
                                      children: [
                                        Text(
                                          '${t.isCredit ? '+' : '-'}${t.montant.toStringAsFixed(0)} XOF',
                                          style: TypographyTokens.titleSmall.copyWith(
                                            color: t.isCredit ? ColorTokens.success : ColorTokens.error,
                                            fontWeight: FontWeight.w600,
                                          ),
                                        ),
                                        Text(
                                          'Solde: ${t.soldeApres.toStringAsFixed(0)}',
                                          style: TypographyTokens.labelSmall.copyWith(color: ColorTokens.onSurfaceVariant),
                                        ),
                                      ],
                                    ),
                                  ),
                                );
                              },
                            ),
            ),
          ],
        );
      },
    );
  }
}