'use client';

import { WerteEntry } from '@/types/werte';

interface WerteListProps {
  entries: WerteEntry[];
  onDelete?: (id: number) => void;
  onEdit?: (entry: WerteEntry) => void;
}

export default function WerteList({ entries, onDelete, onEdit }: WerteListProps) {
  const formatValue = (value: number | string | null | undefined) => {
    if (value === null || value === undefined || value === '' || value === '0' || value === '0.0') {
      return '-';
    }
    return value;
  };

  const formatDate = (dateStr: string) => {
    // Convert YYYY-MM-DD to DD.MM.YYYY
    if (!dateStr) return '-';
    // Parse the date string directly (MySQL returns YYYY-MM-DD)
    const parts = dateStr.toString().split('T')[0].split('-');
    if (parts.length === 3) {
      return `${parts[2]}.${parts[1]}.${parts[0]}`;
    }
    return dateStr;
  };

  const formatTime = (timeStr: string) => {
    // Convert HH:MM:SS to HH:MM
    if (!timeStr) return '-';
    const timeString = timeStr.toString();
    return timeString.substring(0, 5);
  };

  const getWeekday = (dateStr: string) => {
    if (!dateStr) return '-';
    const weekdays = ['So', 'Mo', 'Di', 'Mi', 'Do', 'Fr', 'Sa'];
    // Parse date parts to avoid timezone issues
    const [year, month, day] = dateStr.toString().split('T')[0].split('-');
    const date = new Date(Number(year), Number(month) - 1, Number(day));
    return weekdays[date.getDay()];
  };

  const handleDelete = async (id: number) => {
    if (!confirm('Eintrag wirklich löschen?')) {
      return;
    }

    try {
      const response = await fetch(`/api/werte/${id}`, {
        method: 'DELETE',
      });

      if (response.ok && onDelete) {
        onDelete(id);
      } else {
        alert('Fehler beim Löschen!');
      }
    } catch (error) {
      console.error('Error:', error);
      alert('Fehler beim Löschen!');
    }
  };

  if (entries.length === 0) {
    return (
      <div className="text-center py-8 text-gray-500">
        Keine Einträge vorhanden
      </div>
    );
  }

  return (
    <div className="overflow-x-auto">
      <table className="w-full border-collapse">
        <thead>
          <tr className="bg-[#CCCCFF] border-b-2 border-gray-400">
            <th className="p-2 text-center">Datum</th>
            <th className="p-2 text-center">Tag</th>
            <th className="p-2 text-center">Zeit</th>
            <th className="p-2 text-center">Zucker<br/><span className="text-xs font-normal">mg/dl</span></th>
            <th className="p-2 text-center">Essen</th>
            <th className="p-2 text-center">Gewicht<br/><span className="text-xs font-normal">kg</span></th>
            <th className="p-2 text-center">Druck sys<br/><span className="text-xs font-normal">mmHg</span></th>
            <th className="p-2 text-center">Druck dia<br/><span className="text-xs font-normal">mmHg</span></th>
            <th className="p-2 text-center">Puls<br/><span className="text-xs font-normal">bpm</span></th>
            {onDelete && <th className="p-2 text-center">Aktion</th>}
          </tr>
        </thead>
        <tbody>
          {entries.map((entry, index) => (
            <tr 
              key={entry.ID} 
              className={`border-b border-gray-300 hover:bg-gray-50 ${index % 2 === 0 ? 'bg-white' : 'bg-gray-50'}`}
            >
              <td className="p-2 text-center">{formatDate(entry.Datum)}</td>
              <td className="p-2 text-center">{getWeekday(entry.Datum)}</td>
              <td className="p-2 text-center">{formatTime(entry.Zeit)}</td>
              <td className="p-2 text-center">{formatValue(entry.Zucker)}</td>
              <td className="p-2 text-center">{formatValue(entry.Essen)}</td>
              <td className="p-2 text-center">{formatValue(entry.Gewicht)}</td>
              <td className="p-2 text-center">{formatValue(entry.DruckS)}</td>
              <td className="p-2 text-center">{formatValue(entry.DruckD)}</td>
              <td className="p-2 text-center">{formatValue(entry.Puls)}</td>
              {(onDelete || onEdit) && (
                <td className="p-2 text-center">
                  <div className="flex gap-2 justify-center">
                    {onEdit && (
                      <button
                        onClick={() => onEdit(entry)}
                        className="text-blue-600 hover:text-blue-800 text-sm"
                      >
                        Editieren
                      </button>
                    )}
                    {onDelete && (
                      <button
                        onClick={() => entry.ID && handleDelete(entry.ID)}
                        className="text-red-600 hover:text-red-800 text-sm"
                      >
                        Löschen
                      </button>
                    )}
                  </div>
                </td>
              )}
            </tr>
          ))}
        </tbody>
      </table>
    </div>
  );
}