import 'package:flutter/material.dart';
import '../../../../shared/widgets/common/unified_card.dart';
import '../../../../shared/theme/design_system.dart';
import '../../../../core/utils/formatters.dart';
import '../../domain/entities/analytics_data.dart';

/// Widget de carte KPI utilisant le design system unifié
class KPICardWidget extends StatelessWidget {
  const KPICardWidget({
    super.key,
    required this.analyticsData,
    this.onTap,
    this.showTrend = true,
    this.showDetails = false,
    this.compact = false,
  });

  final AnalyticsData analyticsData;
  final VoidCallback? onTap;
  final bool showTrend;
  final bool showDetails;
  final bool compact;

  @override
  Widget build(BuildContext context) {
    return UnifiedCard(
      variant: UnifiedCardVariant.elevated,
      onTap: onTap,
      child: Padding(
        padding: EdgeInsets.all(
          compact ? DesignSystem.spacing12 : DesignSystem.spacing16,
        ),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          mainAxisSize: MainAxisSize.min,
          children: [
            // En-tête avec icône et titre
            Row(
              children: [
                Container(
                  padding: const EdgeInsets.all(DesignSystem.spacing8),
                  decoration: BoxDecoration(
                    color: _getCouleurMetrique().withOpacity(0.1),
                    borderRadius: BorderRadius.circular(DesignSystem.radius8),
                  ),
                  child: Icon(
                    _getIconeMetrique(),
                    color: _getCouleurMetrique(),
                    size: compact ? 20 : 24,
                  ),
                ),
                const SizedBox(width: DesignSystem.spacing12),
                Expanded(
                  child: Column(
                    crossAxisAlignment: CrossAxisAlignment.start,
                    children: [
                      Text(
                        analyticsData.libelleAffichage,
                        style: compact
                            ? DesignSystem.textTheme.bodyMedium?.copyWith(
                                fontWeight: FontWeight.w600,
                              )
                            : DesignSystem.textTheme.titleMedium?.copyWith(
                                fontWeight: FontWeight.w600,
                              ),
                        maxLines: 2,
                        overflow: TextOverflow.ellipsis,
                      ),
                      if (!compact && analyticsData.description != null)
                        Padding(
                          padding: const EdgeInsets.only(
                            top: DesignSystem.spacing4,
                          ),
                          child: Text(
                            analyticsData.description!,
                            style: DesignSystem.textTheme.bodySmall?.copyWith(
                              color: DesignSystem.textSecondaryColor,
                            ),
                            maxLines: 1,
                            overflow: TextOverflow.ellipsis,
                          ),
                        ),
                    ],
                  ),
                ),
                // Indicateur de fiabilité
                if (showDetails)
                  _buildIndicateurFiabilite(),
              ],
            ),

            SizedBox(height: compact ? DesignSystem.spacing8 : DesignSystem.spacing16),

            // Valeur principale
            Row(
              crossAxisAlignment: CrossAxisAlignment.end,
              children: [
                Expanded(
                  child: Text(
                    analyticsData.valeurFormatee,
                    style: compact
                        ? DesignSystem.textTheme.headlineSmall?.copyWith(
                            fontWeight: FontWeight.bold,
                            color: _getCouleurMetrique(),
                          )
                        : DesignSystem.textTheme.headlineMedium?.copyWith(
                            fontWeight: FontWeight.bold,
                            color: _getCouleurMetrique(),
                          ),
                  ),
                ),
                // Évolution
                if (showTrend && analyticsData.pourcentageEvolution != null)
                  _buildEvolution(),
              ],
            ),

            // Détails supplémentaires
            if (showDetails) ...[
              const SizedBox(height: DesignSystem.spacing12),
              _buildDetails(),
            ],

            // Période et dernière mise à jour
            if (!compact) ...[
              const SizedBox(height: DesignSystem.spacing12),
              _buildInfosPeriode(),
            ],
          ],
        ),
      ),
    );
  }

  /// Widget d'évolution avec icône et pourcentage
  Widget _buildEvolution() {
    final evolution = analyticsData.pourcentageEvolution!;
    final isPositive = evolution > 0;
    final isNegative = evolution < 0;

    Color couleur;
    IconData icone;

    if (isPositive) {
      couleur = DesignSystem.successColor;
      icone = Icons.trending_up;
    } else if (isNegative) {
      couleur = DesignSystem.errorColor;
      icone = Icons.trending_down;
    } else {
      couleur = DesignSystem.warningColor;
      icone = Icons.trending_flat;
    }

    return Container(
      padding: const EdgeInsets.symmetric(
        horizontal: DesignSystem.spacing8,
        vertical: DesignSystem.spacing4,
      ),
      decoration: BoxDecoration(
        color: couleur.withOpacity(0.1),
        borderRadius: BorderRadius.circular(DesignSystem.radius12),
      ),
      child: Row(
        mainAxisSize: MainAxisSize.min,
        children: [
          Icon(
            icone,
            size: 16,
            color: couleur,
          ),
          const SizedBox(width: DesignSystem.spacing4),
          Text(
            analyticsData.evolutionFormatee,
            style: DesignSystem.textTheme.bodySmall?.copyWith(
              color: couleur,
              fontWeight: FontWeight.w600,
            ),
          ),
        ],
      ),
    );
  }

  /// Widget d'indicateur de fiabilité
  Widget _buildIndicateurFiabilite() {
    final fiabilite = analyticsData.indicateurFiabilite;
    Color couleur;

    if (fiabilite >= 90) {
      couleur = DesignSystem.successColor;
    } else if (fiabilite >= 70) {
      couleur = DesignSystem.warningColor;
    } else {
      couleur = DesignSystem.errorColor;
    }

    return Container(
      padding: const EdgeInsets.symmetric(
        horizontal: DesignSystem.spacing6,
        vertical: DesignSystem.spacing2,
      ),
      decoration: BoxDecoration(
        color: couleur.withOpacity(0.1),
        borderRadius: BorderRadius.circular(DesignSystem.radius8),
        border: Border.all(
          color: couleur.withOpacity(0.3),
          width: 1,
        ),
      ),
      child: Text(
        '${fiabilite.toStringAsFixed(0)}%',
        style: DesignSystem.textTheme.bodySmall?.copyWith(
          color: couleur,
          fontWeight: FontWeight.w600,
        ),
      ),
    );
  }

  /// Widget des détails supplémentaires
  Widget _buildDetails() {
    return Column(
      children: [
        // Valeur précédente
        if (analyticsData.valeurPrecedente != null)
          Row(
            mainAxisAlignment: MainAxisAlignment.spaceBetween,
            children: [
              Text(
                'Période précédente',
                style: DesignSystem.textTheme.bodySmall?.copyWith(
                  color: DesignSystem.textSecondaryColor,
                ),
              ),
              Text(
                _formaterValeur(analyticsData.valeurPrecedente!),
                style: DesignSystem.textTheme.bodySmall?.copyWith(
                  fontWeight: FontWeight.w500,
                ),
              ),
            ],
          ),

        const SizedBox(height: DesignSystem.spacing4),

        // Éléments analysés
        if (analyticsData.nombreElementsAnalyses != null)
          Row(
            mainAxisAlignment: MainAxisAlignment.spaceBetween,
            children: [
              Text(
                'Éléments analysés',
                style: DesignSystem.textTheme.bodySmall?.copyWith(
                  color: DesignSystem.textSecondaryColor,
                ),
              ),
              Text(
                analyticsData.nombreElementsAnalyses.toString(),
                style: DesignSystem.textTheme.bodySmall?.copyWith(
                  fontWeight: FontWeight.w500,
                ),
              ),
            ],
          ),

        const SizedBox(height: DesignSystem.spacing4),

        // Temps de calcul
        if (analyticsData.tempsCalculMs != null)
          Row(
            mainAxisAlignment: MainAxisAlignment.spaceBetween,
            children: [
              Text(
                'Temps de calcul',
                style: DesignSystem.textTheme.bodySmall?.copyWith(
                  color: DesignSystem.textSecondaryColor,
                ),
              ),
              Text(
                '${analyticsData.tempsCalculMs}ms',
                style: DesignSystem.textTheme.bodySmall?.copyWith(
                  fontWeight: FontWeight.w500,
                ),
              ),
            ],
          ),
      ],
    );
  }

  /// Widget des informations de période
  Widget _buildInfosPeriode() {
    return Row(
      mainAxisAlignment: MainAxisAlignment.spaceBetween,
      children: [
        Expanded(
          child: Text(
            analyticsData.periodeAnalyse.libelle,
            style: DesignSystem.textTheme.bodySmall?.copyWith(
              color: DesignSystem.textSecondaryColor,
            ),
          ),
        ),
        Text(
          'Mis à jour ${AppFormatters.formatDateRelative(analyticsData.dateCalcul)}',
          style: DesignSystem.textTheme.bodySmall?.copyWith(
            color: DesignSystem.textSecondaryColor,
          ),
        ),
      ],
    );
  }

  /// Obtient la couleur de la métrique
  Color _getCouleurMetrique() {
    return Color(int.parse(
      analyticsData.couleur.replaceFirst('#', '0xFF'),
    ));
  }

  /// Obtient l'icône de la métrique
  IconData _getIconeMetrique() {
    switch (analyticsData.icone) {
      case 'people':
        return Icons.people;
      case 'attach_money':
        return Icons.attach_money;
      case 'event':
        return Icons.event;
      case 'favorite':
        return Icons.favorite;
      case 'trending_up':
        return Icons.trending_up;
      case 'business':
        return Icons.business;
      case 'settings':
        return Icons.settings;
      default:
        return Icons.analytics;
    }
  }

  /// Formate une valeur selon le type de métrique
  String _formaterValeur(double valeur) {
    switch (analyticsData.typeMetrique.typeValeur) {
      case 'amount':
        return '${valeur.toStringAsFixed(0)} ${analyticsData.unite}';
      case 'percentage':
        return '${valeur.toStringAsFixed(1)}${analyticsData.unite}';
      case 'average':
        return valeur.toStringAsFixed(1);
      default:
        return valeur.toStringAsFixed(0);
    }
  }
}