'use client';

interface BackupStats {
  date: string;
  manual: number;
  automatic: number;
  total: number;
}

interface BackupTimelineChartProps {
  stats?: BackupStats[];
  className?: string;
}

export function BackupTimelineChart({ stats = [], className = '' }: BackupTimelineChartProps) {
  // Protection contre les stats non-array
  const safeStats = Array.isArray(stats) ? stats : [];
  const error = safeStats.length === 0 ? 'Aucune donnée disponible' : null;

  // Convertir les stats en map pour accès rapide
  const statsMap = new Map(safeStats.map(s => [s.date, s]));
  
  // Générer les 30 derniers jours
  const days = Array.from({ length: 30 }, (_, i) => {
    const date = new Date();
    date.setDate(date.getDate() - (29 - i));
    // Utiliser la date locale pour éviter les décalages UTC
    const localDate = new Date(date.getTime() - date.getTimezoneOffset() * 60000);
    return localDate.toISOString().split('T')[0];
  });

  // Organiser en semaines (5 semaines de 6 jours + quelques jours)
  const weeks = [];
  for (let i = 0; i < days.length; i += 7) {
    weeks.push(days.slice(i, i + 7));
  }



  const formatDateFull = (dateStr: string) => {
    const date = new Date(dateStr);
    return date.toLocaleDateString('fr-FR', { 
      weekday: 'long',
      day: 'numeric', 
      month: 'long' 
    });
  };

  if (error) {
    return (
      <div className={`p-4 sm:p-6 ${className}`}>
        <div className="text-gray-500 text-sm text-center py-8">
          {error}
        </div>
      </div>
    );
  }

  return (
    <div className={`p-4 sm:p-6 w-full ${className}`}>
      <h3 className="text-lg font-semibold mb-4 flex items-center gap-2">
        💾 Activité de sauvegarde (30 derniers jours)
      </h3>
      
      {/* Vue en ligne avec indicateurs clairs */}
      <div className="mb-6">
        {/* En-têtes des jours */}
        <div className="grid grid-cols-7 gap-1 mb-2">
          {['Lun', 'Mar', 'Mer', 'Jeu', 'Ven', 'Sam', 'Dim'].map(day => (
            <div key={day} className="text-xs text-center text-gray-500 font-medium py-1">
              {day}
            </div>
          ))}
        </div>
        
        {/* Grille des jours avec indicateurs visuels */}
        <div className="space-y-1">
          {weeks.map((week, weekIndex) => (
            <div key={weekIndex} className="grid grid-cols-7 gap-1">
              {week.map((day) => {
                const stat = statsMap.get(day) || { date: day, manual: 0, automatic: 0, total: 0 };
                const hasManual = stat.manual > 0;
                const hasAuto = stat.automatic > 0;
                const dayNumber = new Date(day).getDate();
                
                return (
                  <div key={day} className="group relative">
                    <div className={`
                      relative h-8 rounded border-2 transition-all duration-200 cursor-pointer flex items-center justify-center text-xs font-medium
                      ${stat.total === 0 
                        ? 'border-[var(--border)] text-[var(--muted-foreground)]' 
                        : 'border-transparent'
                      }
                    `}>
                      {/* Jour du mois */}
                      <span className={`relative z-10 ${stat.total > 0 ? 'text-white font-bold' : ''}`}>
                        {dayNumber}
                      </span>
                      
                      {/* Fond selon le type */}
                      {stat.total > 0 && (
                        <div className={`
                          absolute inset-0 rounded
                          ${hasManual && hasAuto 
                            ? 'bg-gradient-to-br from-blue-500 to-green-500' 
                            : hasManual 
                              ? 'bg-blue-500' 
                              : 'bg-green-500'
                          }
                        `}></div>
                      )}
                      
                      {/* Indicateurs visuels pour l'intensité */}
                      {stat.total > 0 && stat.total > 1 && (
                        <div className="absolute -top-1 -right-1 bg-orange-500 text-white rounded-full w-4 h-4 flex items-center justify-center text-xs font-bold">
                          {stat.total > 9 ? '9+' : stat.total}
                        </div>
                      )}
                    </div>
                    
                    {/* Tooltip détaillé */}
                    <div className="absolute bottom-full mb-2 left-1/2 transform -translate-x-1/2 bg-black text-white text-xs rounded py-2 px-3 opacity-0 group-hover:opacity-100 pointer-events-none transition-opacity whitespace-nowrap z-20">
                      <div className="font-semibold">{formatDateFull(day)}</div>
                      {stat.total > 0 ? (
                        <div className="mt-1 space-y-1">
                          {stat.manual > 0 && (
                            <div className="flex items-center gap-2">
                              <div className="w-2 h-2 bg-blue-400 rounded-full"></div>
                              <span>Manuel: {stat.manual}</span>
                            </div>
                          )}
                          {stat.automatic > 0 && (
                            <div className="flex items-center gap-2">
                              <div className="w-2 h-2 bg-green-400 rounded-full"></div>
                              <span>Auto: {stat.automatic}</span>
                            </div>
                          )}
                          <div className="font-semibold border-t border-gray-600 pt-1">
                            Total: {stat.total}
                          </div>
                        </div>
                      ) : (
                        <div className="text-gray-300 mt-1">Aucune sauvegarde</div>
                      )}
                    </div>
                  </div>
                );
              })}
            </div>
          ))}
        </div>
      </div>

      {/* Légende claire */}
      <div className="mb-6 p-3 rounded-lg" style={{ backgroundColor: 'var(--card-hover)' }}>
        <h4 className="text-sm font-medium mb-3 text-[var(--foreground)]">Légende</h4>
        <div className="grid grid-cols-2 gap-3 text-sm">
          <div className="flex items-center gap-3">
            <div className="flex items-center gap-2">
              <div className="w-6 h-6 bg-blue-500 rounded flex items-center justify-center text-white text-xs font-bold">15</div>
              <span className="text-[var(--foreground)]">Manuel seul</span>
            </div>
          </div>
          <div className="flex items-center gap-3">
            <div className="flex items-center gap-2">
              <div className="w-6 h-6 bg-green-500 rounded flex items-center justify-center text-white text-xs font-bold">15</div>
              <span className="text-[var(--foreground)]">Auto seul</span>
            </div>
          </div>
          <div className="flex items-center gap-3">
            <div className="flex items-center gap-2">
              <div className="w-6 h-6 bg-gradient-to-br from-blue-500 to-green-500 rounded flex items-center justify-center text-white text-xs font-bold">15</div>
              <span className="text-[var(--foreground)]">Manuel + Auto</span>
            </div>
          </div>
          <div className="flex items-center gap-3">
            <div className="flex items-center gap-2">
              <div className="w-6 h-6 border-2 rounded flex items-center justify-center text-xs" style={{ backgroundColor: 'var(--gray-light)', borderColor: 'var(--border)', color: 'var(--muted-foreground)' }}>15</div>
              <span className="text-[var(--foreground)]">Aucune</span>
            </div>
          </div>
        </div>
        <div className="mt-3 text-xs text-[var(--muted-foreground)]">
          💡 Le badge orange indique le nombre total quand &gt; 1
        </div>
      </div>

      {/* Statistiques résumées */}
      <div className="grid grid-cols-3 gap-3 text-center">
        <div className="p-3 rounded-lg" style={{ backgroundColor: 'color-mix(in srgb, var(--blue) 10%, transparent)' }}>
          <div className="text-xl font-bold" style={{ color: 'var(--blue)' }}>
            {safeStats.reduce((sum, s) => sum + s.manual, 0)}
          </div>
          <div className="text-xs font-medium" style={{ color: 'var(--blue)' }}>Manuelles</div>
        </div>
        <div className="p-3 rounded-lg" style={{ backgroundColor: 'color-mix(in srgb, var(--green) 10%, transparent)' }}>
          <div className="text-xl font-bold" style={{ color: 'var(--green)' }}>
            {safeStats.reduce((sum, s) => sum + s.automatic, 0)}
          </div>
          <div className="text-xs font-medium" style={{ color: 'var(--green)' }}>Automatiques</div>
        </div>
        <div className="p-3 rounded-lg" style={{ backgroundColor: 'color-mix(in srgb, var(--purple) 10%, transparent)' }}>
          <div className="text-xl font-bold" style={{ color: 'var(--purple)' }}>
            {safeStats.reduce((sum, s) => sum + s.total, 0)}
          </div>
          <div className="text-xs font-medium" style={{ color: 'var(--purple)' }}>Total</div>
        </div>
      </div>
    </div>
  );
}
