import * as React from 'react';
import { useState } from 'react';
import {
  ChevronLeft,
  ChevronRight,
  Calendar as CalendarIcon,
} from 'lucide-react';
import { Button } from '@/figma-make/components/base/button';
import {
  Popover,
  PopoverContent,
  PopoverTrigger,
} from '@/figma-make/components/base/popover';
import { Input } from '@/figma-make/components/base/input';
import { Label } from '@/figma-make/components/base/label';

interface DatePickerProps {
  date: string;
  onDateChange: (date: string) => void;
  disabled?: boolean;
  placeholder?: string;
  formatDisplay?: (date: string) => string;
  hasError?: boolean;
}

export function DatePicker({
  date,
  onDateChange,
  disabled = false,
  placeholder = 'Select date',
  formatDisplay,
  hasError = false,
}: DatePickerProps) {
  const [open, setOpen] = useState(false);
  const [currentMonth, setCurrentMonth] = useState(() => {
    const d = date ? new Date(date) : new Date();
    return { year: d.getFullYear(), month: d.getMonth() };
  });

  const defaultFormatDisplay = (dateStr: string) => {
    if (!dateStr) return placeholder;
    const d = new Date(dateStr + 'T00:00:00');
    return d.toLocaleDateString('id-ID', {
      weekday: 'long',
      year: 'numeric',
      month: 'long',
      day: 'numeric',
    });
  };

  // const formatDateInput = (dateStr: string) => {
  //   if (!dateStr) return '';
  //   const d = new Date(dateStr + 'T00:00:00');
  //   return d.toLocaleDateString('en-GB', {
  //     day: '2-digit',
  //     month: '2-digit',
  //     year: 'numeric',
  //   });
  // };

  const displayFormatter = formatDisplay || defaultFormatDisplay;

  const navigateMonth = (direction: 'prev' | 'next') => {
    const newDate = new Date(
      currentMonth.year,
      currentMonth.month + (direction === 'next' ? 1 : -1)
    );
    setCurrentMonth({ year: newDate.getFullYear(), month: newDate.getMonth() });
  };

  const handleDateSelect = (dateStr: string) => {
    onDateChange(dateStr);
    setOpen(false);
  };

  const handleManualInput = (value: string) => {
    onDateChange(value);
    setOpen(false);
  };

  const renderCalendar = () => {
    const { year, month } = currentMonth;
    const firstDay = new Date(year, month, 1).getDay();
    const adjustedFirstDay = firstDay === 0 ? 6 : firstDay - 1; // Monday = 0
    const daysInMonth = new Date(year, month + 1, 0).getDate();
    const monthName = new Date(year, month).toLocaleDateString('en-US', {
      month: 'long',
    });

    const days = [];

    // Empty cells before first day
    for (let i = 0; i < adjustedFirstDay; i++) {
      days.push(<div key={`empty-${i}`} className='h-9 w-9' />);
    }

    // Days of the month
    for (let day = 1; day <= daysInMonth; day++) {
      const dateStr = `${year}-${String(month + 1).padStart(2, '0')}-${String(day).padStart(2, '0')}`;
      const isSelected = dateStr === date;
      const isToday = dateStr === new Date().toISOString().split('T')[0];

      days.push(
        <button
          key={day}
          onClick={() => handleDateSelect(dateStr)}
          className={`
            h-9 w-9 rounded-md text-sm font-medium transition-colors
            ${isSelected ? 'bg-[#0069e0] text-white hover:bg-[#0052b3]' : ''}
            ${!isSelected && isToday ? 'border border-[#0069e0] text-[#0069e0]' : ''}
            ${!isSelected && !isToday ? 'hover:bg-gray-100 text-gray-700' : ''}
          `}
        >
          {day}
        </button>
      );
    }

    return (
      <div className='p-3'>
        <div className='flex items-center justify-between mb-3'>
          <button
            onClick={() => navigateMonth('prev')}
            className='p-1 hover:bg-gray-100 rounded-md transition-colors'
          >
            <ChevronLeft className='w-4 h-4 text-gray-600' />
          </button>
          <div className='font-semibold text-sm text-gray-900'>
            {monthName} {year}
          </div>
          <button
            onClick={() => navigateMonth('next')}
            className='p-1 hover:bg-gray-100 rounded-md transition-colors'
          >
            <ChevronRight className='w-4 h-4 text-gray-600' />
          </button>
        </div>
        <div className='grid grid-cols-7 gap-1 mb-2'>
          {['Mo', 'Tu', 'We', 'Th', 'Fr', 'Sa', 'Su'].map((day) => (
            <div
              key={day}
              className='h-9 w-9 flex items-center justify-center text-xs font-medium text-gray-500'
            >
              {day}
            </div>
          ))}
        </div>
        <div className='grid grid-cols-7 gap-1'>{days}</div>
      </div>
    );
  };

  return (
    <Popover open={open} onOpenChange={setOpen}>
      <PopoverTrigger asChild>
        <Button
          variant='outline'
          disabled={disabled}
          className={`w-full justify-start text-left font-normal hover:bg-gray-50 ${hasError ? 'border-red-500 focus:ring-red-500' : 'border-gray-200'}`}
        >
          <CalendarIcon className='mr-2 h-4 w-4 text-gray-500' />
          {date ? (
            <span className='text-gray-900'>{displayFormatter(date)}</span>
          ) : (
            <span className='text-gray-500'>{placeholder}</span>
          )}
        </Button>
      </PopoverTrigger>
      <PopoverContent
        className='w-auto p-0 bg-white shadow-lg rounded-xl'
        align='start'
      >
        {renderCalendar()}
        <div className='p-3 border-t border-gray-200'>
          <Label
            htmlFor='manual-date'
            className='text-xs text-gray-600 mb-1.5 block'
          >
            Atau ketik manual (YYYY-MM-DD):
          </Label>
          <Input
            id='manual-date'
            type='date'
            value={date}
            onChange={(e) => handleManualInput(e.target.value)}
            className='text-sm border-gray-200'
          />
        </div>
      </PopoverContent>
    </Popover>
  );
}