import React from 'react';
import { useStats } from '../../hooks/useStats';
import { timeToMinutes } from '../../utils/time';

interface TimetableProps {
  from_date: string;
  to_date: string;
  day_start: string;
  day_end: string;
};

const Timetable: React.FC<TimetableProps> = ({ from_date, to_date, day_start, day_end }) => {
  const { timetable, isLoading } = useStats(from_date, to_date, day_start, day_end);

  if (isLoading) return <div className="text-center p-4">Loading timetable...</div>;
  if (!timetable?.slots || timetable.slots.length === 0) {
    return <div className="text-center p-4 text-gray-500">No data available for this period.</div>;
  }

  // Grouping slots by date to make it easier to render rows
  const groupedSlots = timetable.slots.reduce((acc: any, slot) => {
    if (!acc[slot.date]) acc[slot.date] = [];
    acc[slot.date].push(slot);
    return acc;
  }, {});

  return (
    <div className="bg-white p-4 rounded-xl shadow-sm border border-gray-200 overflow-x-auto">
      <h3 className="text-lg font-semibold mb-4 text-gray-800">Sleep Timetable</h3>
      <div className="min-w-[800px]">
        {Object.keys(groupedSlots).map((date) => (
          <div key={date} className="mb-6 last:mb-0">
            <h4 className="text-sm font-medium text-gray-500 mb-2">{date}</h4>
            <div className="flex w-full h-8 gap-1 bg-gray-50 p-1 rounded-lg overflow-hidden">
              {groupedSlots[date].map((slot: any) => {
                const duration = Math.max(1, timeToMinutes(slot.slot_end) - timeToMinutes(slot.slot_start));

                return (
                  <div
                    key={`${date}-${slot.slot_start}`}
                    className={`h-full rounded-sm transition-all duration-300 cursor-help ${
                      slot.sleeping ? 'bg-blue-900' : 'bg-gray-200'
                    }`}
                    style={{ flex: duration }}
                    title={`${slot.slot_start} - ${slot.slot_end} (${duration}m)`}
                  >
                    {/* Only show text if there's enough space */}
                    <div className="overflow-hidden whitespace-nowrap text-[10px] leading-none flex items-center justify-center h-full px-1">
                       {duration > 40 && <span className="text-white/70">{slot.slot_start}</span>}
                    </div>
                  </div>
                );
              })}
            </div>
          </div>
        ))}
      </div>
    </div>
  );
};

export default Timetable;