'use client';

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

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

function ConfirmDialog({
  onConfirm,
  onCancel,
}: {
  onConfirm: () => void;
  onCancel: () => void;
}) {
  return (
    <div className="fixed inset-0 z-50 flex items-center justify-center bg-black/40">
      <div className="bg-white border border-gray-300 rounded-lg shadow-lg p-6 w-80 text-center">
        <p className="mb-6 text-gray-800 font-medium">Eintrag wirklich löschen?</p>
        <div className="flex justify-center gap-4">
          <button
            onClick={onConfirm}
            className="bg-red-500 hover:bg-red-600 text-white font-medium py-1.5 px-6 rounded-lg transition-colors"
          >
            Löschen
          </button>
          <button
            onClick={onCancel}
            className="bg-[#85B7D7] hover:bg-[#6a9fc5] text-black font-medium py-1.5 px-6 rounded-lg transition-colors"
          >
            Abbrechen
          </button>
        </div>
      </div>
    </div>
  );
}

export default function WerteList({ entries, onDelete, onEdit }: WerteListProps) {
  const [confirmId, setConfirmId] = useState<number | null>(null);
  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) => {
    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!');
    } finally {
      setConfirmId(null);
    }
  };

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

  return (
    <div className="overflow-x-auto">
      {confirmId !== null && (
        <ConfirmDialog
          onConfirm={() => handleDelete(confirmId)}
          onCancel={() => setConfirmId(null)}
        />
      )}
      <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 && setConfirmId(entry.ID)}
                        className="text-red-600 hover:text-red-800 text-sm"
                      >
                        Löschen
                      </button>
                    )}
                  </div>
                </td>
              )}
            </tr>
          ))}
        </tbody>
      </table>
    </div>
  );
}