import './style.scss';
import '@/app/styles/stock-common.scss';
import { cache } from 'react';
import { Metadata } from 'next';
import Link from 'next/link';
import { notFound } from 'next/navigation';
import { fetchStockDetail, fetchStockHistory } from '@/lib/api/stock';
import { changeDirection, changeSymbol, formatChangeRate, formatKrwCompact, formatNumber, tradingStatusLabel } from '@/lib/utils/stock';
import Pager from '../_components/Pager';

const TABS = [
	{ value: 'price', label: '시세' },
	{ value: 'news', label: '뉴스' },
	{ value: 'disclosure', label: '공시' },
	{ value: 'discussion', label: '토론' }
];

const HISTORY_PER_PAGE = 30;

type Props = {
	params: Promise<{
		code: string;
	}>;
	searchParams: Promise<{
		tab?: string;
		page?: string;
	}>;
};

// generateMetadata + 본문 이중 호출 방지 (요청 단위 dedupe)
const getDetail = cache(async (code: string) => {
	return await fetchStockDetail(code);
});

export async function generateMetadata({ params }: Props): Promise<Metadata>
{
	const { code } = await params;
	const res = await getDetail(code);

	if (!res.success || !res.data) {
		return {
			title: '종목 상세 — 개미투자'
		};
	}

	return {
		title: `${res.data.name}(${res.data.code}) 주가·시세 — 개미투자`,
		description: `${res.data.name}(${res.data.code}) 전일 종가·등락률·거래량·일별 시세 — 전일 종가 기준(T+1)`
	};
}

export default async function StockDetailPage({ params, searchParams }: Props)
{
	const { code } = await params;
	const query = await searchParams;
	const tab = TABS.some(c => c.value === query.tab) ? (query.tab as string) : 'price';
	const page = Math.max(Number(query.page) || 1, 1);

	const res = await getDetail(code);

	// 없는 코드(형식 불일치 포함)는 404
	if (!res.success && res.status === 404) {
		return notFound();
	}

	// 백엔드 미기동 등 그 외 실패 — 에러 UI 로 우아하게 처리
	if (!res.success || !res.data) {
		return (
			<div id='stock-detail'>
				<div className='stock-detail__error' role='alert'>
					<strong>종목 정보를 불러오지 못했습니다.</strong>
					잠시 후 다시 시도해 주세요.
				</div>
			</div>
		);
	}

	const detail = res.data;
	const latest = detail.recentPrices.length > 0 ? detail.recentPrices[0] : null;
	const direction = changeDirection(detail.changeRate);
	const statusLabel = tradingStatusLabel(detail.tradingStatus);

	// 시세 탭만 히스토리 조회 (request-time)
	const history = tab === 'price' ? await fetchStockHistory(code, { page, perPage: HISTORY_PER_PAGE }) : null;

	return (
		<div id='stock-detail'>
			{/* 상단 요약 — T+1 데이터임을 명시 */}
			<header className='stock-detail__summary'>
				<div className='stock-detail__title'>
					<h1>{detail.name}</h1>
					<span className='stock-detail__code'>{detail.code}</span>
					<span className={`stock-badge stock-badge--${detail.market.toLowerCase()}`}>{detail.market}</span>
					{statusLabel && (
						<span className={`stock-badge stock-badge--${detail.tradingStatus.toLowerCase()}`}>{statusLabel}</span>
					)}
					{detail.sectorName && <span className='stock-detail__sector'>{detail.sectorName}</span>}
				</div>

				<div className='stock-detail__price'>
					<strong className={`stock-detail__close stock-change stock-change--${direction}`}>
						{formatNumber(detail.closePrice)}
					</strong>
					<span className={`stock-detail__diff stock-change stock-change--${direction}`}>
						{changeSymbol(direction)} {latest ? formatNumber(Math.abs(latest.changeAmount)) : '—'} ({formatChangeRate(detail.changeRate)})
					</span>
				</div>

				<dl className='stock-detail__meta'>
					<div>
						<dt>거래량</dt>
						<dd>{formatNumber(latest?.volume)}</dd>
					</div>
					<div>
						<dt>거래대금</dt>
						<dd>{formatKrwCompact(latest?.tradingValue)}</dd>
					</div>
					<div>
						<dt>시가총액</dt>
						<dd>{formatKrwCompact(detail.marketCap)}</dd>
					</div>
				</dl>

				<p className='stock-detail__basis'>
					전일 기준 · {detail.lastTradingDate ?? '데이터 준비 중'} 종가 (T+1 반영)
				</p>
			</header>

			{/* 탭 */}
			<nav className='stock-detail__tabs' aria-label='종목 상세 탭'>
				{TABS.map(item => (
					<Link
						key={item.value}
						href={item.value === 'price' ? `/stock/${detail.code}` : `/stock/${detail.code}?tab=${item.value}`}
						{...(tab === item.value ? { 'aria-current': 'page' as const } : {})}
					>
						{item.label}
					</Link>
				))}
			</nav>

			<section className='stock-detail__panel'>
				{tab !== 'price' ? (
					<p className='stock-detail__placeholder'>준비 중입니다.</p>
				) : !history || !history.success || !history.data ? (
					<div className='stock-detail__error' role='alert'>
						<strong>일별 시세를 불러오지 못했습니다.</strong>
						잠시 후 다시 시도해 주세요.
					</div>
				) : history.data.list.length === 0 ? (
					<p className='stock-detail__empty'>수집된 일별 시세가 없습니다.</p>
				) : (
					<>
						<table className='stock-detail__table'>
							<caption>{detail.name} 일별 시세 — 날짜, 종가, 등락, 시가, 고가, 저가, 거래량, 거래대금</caption>
							<thead>
								<tr>
									<th scope='col'>날짜</th>
									<th scope='col'>종가</th>
									<th scope='col'>등락률</th>
									<th scope='col' className='stock-detail__col--sub'>시가</th>
									<th scope='col' className='stock-detail__col--sub'>고가</th>
									<th scope='col' className='stock-detail__col--sub'>저가</th>
									<th scope='col'>거래량</th>
									<th scope='col' className='stock-detail__col--sub'>거래대금</th>
								</tr>
							</thead>
							<tbody>
								{history.data.list.map(row => {
									const rowDirection = changeDirection(row.changeRate);

									return (
										<tr key={row.tradingDate}>
											<td>{row.tradingDate}</td>
											<td>{formatNumber(row.close)}</td>
											<td className={`stock-change stock-change--${rowDirection}`}>
												{changeSymbol(rowDirection)} {formatChangeRate(row.changeRate)}
											</td>
											<td className='stock-detail__col--sub'>{formatNumber(row.open)}</td>
											<td className='stock-detail__col--sub'>{formatNumber(row.high)}</td>
											<td className='stock-detail__col--sub'>{formatNumber(row.low)}</td>
											<td>{formatNumber(row.volume)}</td>
											<td className='stock-detail__col--sub'>{formatKrwCompact(row.tradingValue)}</td>
										</tr>
									);
								})}
							</tbody>
						</table>

						<Pager
							total={history.data.total}
							page={page}
							perPage={HISTORY_PER_PAGE}
							basePath={`/stock/${detail.code}`}
							query={{}}
						/>
					</>
				)}
			</section>
		</div>
	);
}