import { useState, useEffect } from 'react';
import { format, parseISO } from 'date-fns';
import type { TimeLog } from '../hooks/useLogs';

interface Props {
  isOpen: boolean;
  onClose: () => void;
  onSave: (data: { date: string; time: string; description: string }) => Promise<unknown>;
  editingLog?: TimeLog | null;
}

function formatTimeForInput(hours: number, mins: number): string {
  if (mins === 0) {
    return String(hours);
  }
  return `${hours}:${String(mins).padStart(2, '0')}`;
}

export function AddLogModal({ isOpen, onClose, onSave, editingLog }: Props) {
  const [date, setDate] = useState(format(new Date(), 'yyyy-MM-dd'));
  const [time, setTime] = useState('8');
  const [description, setDescription] = useState('');
  const [error, setError] = useState('');
  const [isLoading, setIsLoading] = useState(false);

  useEffect(() => {
    if (isOpen) {
      if (editingLog) {
        setDate(format(parseISO(editingLog.date), 'yyyy-MM-dd'));
        setTime(formatTimeForInput(editingLog.hours, editingLog.mins));
        setDescription(editingLog.description);
      } else {
        setDate(format(new Date(), 'yyyy-MM-dd'));
        setTime('8');
        setDescription('');
      }
      setError('');
    }
  }, [isOpen, editingLog]);

  if (!isOpen) return null;

  const handleSubmit = async (e: React.FormEvent) => {
    e.preventDefault();
    setError('');
    setIsLoading(true);

    try {
      await onSave({ date, time, description });
      onClose();
    } catch (err) {
      setError(err instanceof Error ? err.message : 'Ошибка');
    } finally {
      setIsLoading(false);
    }
  };

  const setQuickTime = (value: string) => {
    setTime(value);
  };

  return (
    <div className="fixed inset-0 bg-black bg-opacity-50 flex items-center justify-center z-50">
      <div className="bg-white rounded-lg p-6 w-full max-w-md mx-4">
        <h2 className="text-xl font-semibold mb-4">
          {editingLog ? 'Редактирование записи' : 'Новая запись'}
        </h2>

        <form onSubmit={handleSubmit} className="space-y-4">
          <div>
            <label className="block text-sm font-medium text-gray-700 mb-1">
              Дата
            </label>
            <input
              type="date"
              value={date}
              onChange={(e) => setDate(e.target.value)}
              className="w-full px-3 py-2 border border-gray-300 rounded-md focus:outline-none focus:ring-2 focus:ring-blue-500"
              required
            />
          </div>

          <div>
            <label className="block text-sm font-medium text-gray-700 mb-1">
              Часы
            </label>
            <div className="flex gap-2 mb-2">
              <button
                type="button"
                onClick={() => setQuickTime('8')}
                className={`px-3 py-1 rounded-md text-sm ${
                  time === '8'
                    ? 'bg-blue-600 text-white'
                    : 'bg-gray-100 text-gray-700 hover:bg-gray-200'
                }`}
              >
                8 ч
              </button>
              <button
                type="button"
                onClick={() => setQuickTime('4')}
                className={`px-3 py-1 rounded-md text-sm ${
                  time === '4'
                    ? 'bg-blue-600 text-white'
                    : 'bg-gray-100 text-gray-700 hover:bg-gray-200'
                }`}
              >
                4 ч
              </button>
              <button
                type="button"
                onClick={() => setQuickTime('1')}
                className={`px-3 py-1 rounded-md text-sm ${
                  time === '1'
                    ? 'bg-blue-600 text-white'
                    : 'bg-gray-100 text-gray-700 hover:bg-gray-200'
                }`}
              >
                1 ч
              </button>
            </div>
            <input
              type="text"
              value={time}
              onChange={(e) => setTime(e.target.value)}
              placeholder="8, 8:30, 8,5"
              className="w-full px-3 py-2 border border-gray-300 rounded-md focus:outline-none focus:ring-2 focus:ring-blue-500"
              required
            />
            <p className="text-xs text-gray-500 mt-1">
              Форматы: 8, 8:30, 8,5, 8.5
            </p>
          </div>

          <div>
            <label className="block text-sm font-medium text-gray-700 mb-1">
              Описание
            </label>
            <textarea
              value={description}
              onChange={(e) => setDescription(e.target.value)}
              className="w-full px-3 py-2 border border-gray-300 rounded-md focus:outline-none focus:ring-2 focus:ring-blue-500 resize-none"
              rows={3}
              required
            />
          </div>

          {error && <p className="text-red-500 text-sm">{error}</p>}

          <div className="flex gap-3 pt-2">
            <button
              type="button"
              onClick={onClose}
              className="flex-1 py-2 px-4 border border-gray-300 text-gray-700 rounded-md hover:bg-gray-50"
            >
              Отмена
            </button>
            <button
              type="submit"
              disabled={isLoading}
              className="flex-1 py-2 px-4 bg-blue-600 text-white rounded-md hover:bg-blue-700 disabled:opacity-50"
            >
              {isLoading ? 'Сохранение...' : 'Сохранить'}
            </button>
          </div>
        </form>
      </div>
    </div>
  );
}