// src/app/reservation/page.tsx
import { getRoomReservations, Reservation } from "@/lib/reservation";
import { RoomInfo } from "@/lib/roominfo";

const ROOMS = Object.keys(RoomInfo); // ["ENJI","PINK","MINT"]
const startHour = 7; // 開店時間
const endHour = 22; // 閉店時間
const TIMES = Array.from({ length: endHour - startHour }, (_, i) => `${startHour + i}:00`); // 7:00〜21:00

function getNextWeekDates(): Date[] {
	const today = new Date();
	const dates: Date[] = [];
	const dayOfWeek = today.getDay();
	const daysUntilNextSaturday = 6 - dayOfWeek + 7; // 翌週土曜まで

	for (let i = 0; i <= daysUntilNextSaturday; i++) {
		const d = new Date(today);
		d.setDate(today.getDate() + i);
		dates.push(d);
	}
	return dates;
}

function formatDate(date: Date) {
	const y = date.getFullYear();
	const m = (date.getMonth() + 1).toString().padStart(2, "0");
	const d = date.getDate().toString().padStart(2, "0");
	return `${y}-${m}-${d}`;
}

function buildReservationMap(reservations: Reservation[], dates: Date[]) {
	const map: Record<string, Record<string, "◯" | "✗">> = {};
	TIMES.forEach((time) => {
		map[time] = {};
		dates.forEach((date) => {
			map[time][formatDate(date)] = "◯";
		});
	});

	reservations.forEach((r) => {
		const dateStr = formatDate(new Date(r.sdate));
		if (!map[TIMES[0]][dateStr]) return;

		if (r.type === "oneday") {
			TIMES.forEach((time) => (map[time][dateStr] = "✗"));
		} else if (r.type === "range") {
			const [startH, startM] = r.start.split(":").map(Number);
			const startMinutes = startH * 60 + startM;

			const [endH, endM] = r.end.split(":").map(Number);
			const endMinutes = endH * 60 + endM;

			TIMES.forEach((time) => {
				const [hour, minute] = time.split(":").map(Number);
				const timeMinutes = hour * 60 + minute;
				if (timeMinutes >= startMinutes && timeMinutes < endMinutes) {
					map[time][dateStr] = "✗";
				}
			});
		}
	});

	return map;
}

export default async function ReservationPage() {
	const dates = getNextWeekDates();
	const dateLabels = dates.map(
		(d) =>
			`${d.getMonth() + 1}/${d.getDate()} (${
				["日", "月", "火", "水", "木", "金", "土"][d.getDay()]
			})`
	);

	// 3部屋の予約データ取得
	const roomData: Record<string, Record<string, Record<string, "◯" | "✗">>> = {};
	for (const room of ROOMS) {
		const reservations = await getRoomReservations(room);
		roomData[room] = buildReservationMap(reservations, dates);
	}

	return (
		<main className="max-w-7xl mx-auto px-4 py-8 space-y-12 text-stone-700">
			{ROOMS.map((room) => (
				<section
					key={room}
					className="bg-white shadow-sm rounded-2xl border border-stone-200 p-6 space-y-6"
				>
					<h2 className="text-2xl text-stone-800 font-semibold">{room} 予約表</h2>
					<p>
						外部予約サービス：{" "}
						<a
							href={RoomInfo[room].url}
							target="_blank"
							rel="noopener noreferrer"
							className="text-blue-600 underline"
						>
							こちら
						</a>
					</p>

					<div
						className="flex border border-stone-200"
						style={{ "--col-count": dates.length } as React.CSSProperties}
					>
						{/* 固定列（時間） */}
						<div className="flex-shrink-0 bg-stone-50">
							<table className="border-collapse border border-stone-200 w-full md:w-[10%] text-stone-700">
								<thead className="bg-stone-100 text-stone-700">
									<tr>
										<th className="border border-stone-200 px-2 py-1 text-sm font-semibold whitespace-nowrap">
											時間
										</th>
									</tr>
								</thead>
								<tbody>
									{TIMES.map((time) => (
										<tr key={time} className="even:bg-stone-50">
											<td className="border border-stone-200 px-2 py-1 text-sm font-medium whitespace-nowrap">
												{time}
											</td>
										</tr>
									))}
								</tbody>
							</table>
						</div>

						{/* 横スクロール可能列 */}
						<div className="overflow-x-auto flex-1 bg-white">
							<table className="border-collapse border border-stone-200 w-full md:table-fixed text-stone-700">
								<thead className="bg-stone-100 text-stone-800">
									<tr>
										{dateLabels.map((label) => (
											<th
												key={label}
												className="border border-stone-200 px-2 py-1 text-sm font-medium whitespace-nowrap
                                   md:w-[calc(90%/var(--col-count))]"
											>
												{label}
											</th>
										))}
									</tr>
								</thead>
								<tbody>
									{TIMES.map((time) => (
										<tr key={time} className="even:bg-stone-50">
											{dates.map((date) => {
												const dateStr = formatDate(date);
												const val = roomData[room][time][dateStr];
												return (
													<td
														key={date.toISOString()}
														className={`border border-stone-200 px-2 py-1 text-center text-sm font-medium whitespace-nowrap
                              md:w-[calc(90%/var(--col-count))]
                              ${
									val === "✗"
										? "bg-stone-100 text-stone-400"
										: "bg-white text-stone-700"
								}`}
													>
														{val}
													</td>
												);
											})}
										</tr>
									))}
								</tbody>
							</table>
						</div>
					</div>
				</section>
			))}
		</main>
	);
}