/**
 * CustomTimePicker 컴포넌트
 * 오전/오후, 시간, 분을 선택할 수 있는 시간 피커
 * NumberPicker를 사용하여 스크롤 방식 선택 제공
 */
import { useState, useEffect, useRef } from 'react';
import { motion, AnimatePresence } from 'framer-motion';
import { Clock } from 'lucide-react';
import NumberPicker from './NumberPicker';

function CustomTimePicker({ value, onChange, placeholder = "시간 선택" }) {
    const [isOpen, setIsOpen] = useState(false);
    const ref = useRef(null);

    // 현재 값 파싱
    const parseValue = () => {
        if (!value) return { hour: "12", minute: "00", period: "오후" };
        const [h, m] = value.split(":");
        const hour = parseInt(h);
        const isPM = hour >= 12;
        const hour12 = hour === 0 ? 12 : hour > 12 ? hour - 12 : hour;
        return {
            hour: String(hour12).padStart(2, "0"),
            minute: m,
            period: isPM ? "오후" : "오전",
        };
    };

    const parsed = parseValue();
    const [selectedHour, setSelectedHour] = useState(parsed.hour);
    const [selectedMinute, setSelectedMinute] = useState(parsed.minute);
    const [selectedPeriod, setSelectedPeriod] = useState(parsed.period);

    // 외부 클릭 시 닫기
    useEffect(() => {
        const handleClickOutside = (e) => {
            if (ref.current && !ref.current.contains(e.target)) {
                setIsOpen(false);
            }
        };
        document.addEventListener("mousedown", handleClickOutside);
        return () => document.removeEventListener("mousedown", handleClickOutside);
    }, []);

    // 피커 열릴 때 현재 값으로 초기화
    useEffect(() => {
        if (isOpen) {
            const parsed = parseValue();
            setSelectedHour(parsed.hour);
            setSelectedMinute(parsed.minute);
            setSelectedPeriod(parsed.period);
        }
    }, [isOpen, value]);

    // 시간 확정
    const handleSave = () => {
        let hour = parseInt(selectedHour);
        if (selectedPeriod === "오후" && hour !== 12) hour += 12;
        if (selectedPeriod === "오전" && hour === 12) hour = 0;
        const timeStr = `${String(hour).padStart(2, "0")}:${selectedMinute}`;
        onChange(timeStr);
        setIsOpen(false);
    };

    // 취소
    const handleCancel = () => {
        setIsOpen(false);
    };

    // 초기화
    const handleClear = () => {
        onChange("");
        setIsOpen(false);
    };

    // 표시용 포맷
    const displayValue = () => {
        if (!value) return placeholder;
        const [h, m] = value.split(":");
        const hour = parseInt(h);
        const isPM = hour >= 12;
        const hour12 = hour === 0 ? 12 : hour > 12 ? hour - 12 : hour;
        return `${isPM ? "오후" : "오전"} ${hour12}:${m}`;
    };

    // 피커 아이템 데이터
    const periods = ["오전", "오후"];
    const hours = [
        "01", "02", "03", "04", "05", "06",
        "07", "08", "09", "10", "11", "12",
    ];
    const minutes = Array.from({ length: 60 }, (_, i) =>
        String(i).padStart(2, "0")
    );

    return (
        <div ref={ref} className="relative">
            <button
                type="button"
                onClick={() => setIsOpen(!isOpen)}
                className="w-full px-4 py-3 border border-gray-200 rounded-xl bg-white flex items-center justify-between hover:border-gray-300 transition-colors focus:outline-none focus:ring-2 focus:ring-primary focus:border-transparent"
            >
                <span className={value ? "text-gray-900" : "text-gray-400"}>
                    {displayValue()}
                </span>
                <Clock size={18} className="text-gray-400" />
            </button>

            <AnimatePresence>
                {isOpen && (
                    <motion.div
                        initial={{ opacity: 0, y: -10 }}
                        animate={{ opacity: 1, y: 0 }}
                        exit={{ opacity: 0, y: -10 }}
                        className="absolute top-full left-0 mt-2 bg-white rounded-2xl shadow-xl border border-gray-200 z-50 overflow-hidden"
                    >
                        {/* 피커 영역 */}
                        <div className="flex items-center justify-center px-4 py-4">
                            {/* 오전/오후 (맨 앞) */}
                            <NumberPicker
                                items={periods}
                                value={selectedPeriod}
                                onChange={setSelectedPeriod}
                            />

                            {/* 시간 */}
                            <NumberPicker
                                items={hours}
                                value={selectedHour}
                                onChange={setSelectedHour}
                            />

                            <span className="text-xl text-gray-300 font-medium mx-0.5">
                                :
                            </span>

                            {/* 분 */}
                            <NumberPicker
                                items={minutes}
                                value={selectedMinute}
                                onChange={setSelectedMinute}
                            />
                        </div>

                        {/* 푸터 버튼 */}
                        <div className="flex items-center justify-between px-4 py-3 bg-gray-50">
                            <button
                                type="button"
                                onClick={handleClear}
                                className="px-3 py-1.5 text-sm text-gray-400 hover:text-gray-600 transition-colors"
                            >
                                초기화
                            </button>
                            <div className="flex items-center gap-2">
                                <button
                                    type="button"
                                    onClick={handleCancel}
                                    className="px-4 py-1.5 text-sm text-gray-600 hover:bg-gray-200 rounded-lg transition-colors"
                                >
                                    취소
                                </button>
                                <button
                                    type="button"
                                    onClick={handleSave}
                                    className="px-4 py-1.5 text-sm bg-primary text-white font-medium rounded-lg hover:bg-primary-dark transition-colors"
                                >
                                    저장
                                </button>
                            </div>
                        </div>
                    </motion.div>
                )}
            </AnimatePresence>
        </div>
    );
}

export default CustomTimePicker;