'use client';

import * as React from 'react';
import { Clock } from 'lucide-react';
import { format } from 'date-fns';
import { cn } from '@/lib/utils';
import { Button } from '@/components/ui/button';
import DatePickerLib from 'react-datepicker';
import 'react-datepicker/dist/react-datepicker.css';

interface TimePickerProps {
  time: string; // HH:mm format (e.g., "09:00")
  setTime: (time: string) => void;
  label?: string;
  isDark?: boolean;
}

export function TimePicker({ time, setTime, label, isDark = false }: TimePickerProps) {
  const [isOpen, setIsOpen] = React.useState(false);
  const wrapperRef = React.useRef<HTMLDivElement>(null);

  // Convert HH:mm string to Date object for the time picker
  const timeValue = React.useMemo(() => {
    if (!time) return null;
    const [hours, minutes] = time.split(':').map(Number);
    const date = new Date();
    date.setHours(hours || 9);
    date.setMinutes(minutes || 0);
    date.setSeconds(0);
    return date;
  }, [time]);

  // Handle time change from the picker
  const handleTimeChange = (date: Date | null) => {
    if (date) {
      const hours = date.getHours().toString().padStart(2, '0');
      const minutes = date.getMinutes().toString().padStart(2, '0');
      setTime(`${hours}:${minutes}`);
    }
  };

  // Close picker when clicking outside
  React.useEffect(() => {
    const handleClickOutside = (event: MouseEvent) => {
      if (wrapperRef.current && !wrapperRef.current.contains(event.target as Node)) {
        setIsOpen(false);
      }
    };

    if (isOpen) {
      document.addEventListener('mousedown', handleClickOutside);
    }

    return () => {
      document.removeEventListener('mousedown', handleClickOutside);
    };
  }, [isOpen]);

  // Format display time
  const displayTime = timeValue
    ? format(timeValue, 'h:mm a') // e.g., "9:00 AM"
    : 'Select time';

  return (
    <div className="space-y-2">
      {label && (
        <label className={cn(
          "text-sm font-medium",
          isDark ? "text-gray-300" : "text-gray-700"
        )}>
          {label}
        </label>
      )}
      <div className="relative" ref={wrapperRef}>
        <Button
          type="button"
          variant="outline"
          onClick={() => setIsOpen(!isOpen)}
          className={cn(
            "w-full justify-start text-left font-normal h-12 text-base",
            !timeValue && "text-muted-foreground",
            isDark
              ? "bg-gray-800 border-gray-600 text-white hover:bg-gray-700"
              : "bg-white border-gray-300 text-gray-900 hover:bg-gray-50"
          )}
        >
          <Clock className="mr-2 h-5 w-5" />
          {displayTime}
        </Button>
        {isOpen && (
          <div className={cn(
            "absolute z-[9999] mt-2 rounded-lg shadow-lg border",
            isDark
              ? "bg-gray-800 border-gray-700"
              : "bg-white border-gray-200"
          )}>
            <DatePickerLib
              selected={timeValue}
              onChange={handleTimeChange}
              showTimeSelect
              showTimeSelectOnly
              timeIntervals={15}
              timeCaption="Time"
              dateFormat="h:mm aa"
              inline
              className="time-picker"
              wrapperClassName="time-picker-wrapper"
            />
          </div>
        )}
      </div>
    </div>
  );
}