"use client";

// 종목 페이지 상단 가격 헤더.
// 표시: 종목명 / (코드·시장) / 현재가 / 전일대비 + 우측에 sparkline.
// 한국 거래소 관행대로 상승=빨강, 하락=파랑.

import { Sparkline } from "./Sparkline";

type Props = {
  name: string;
  code: string;
  market: string;
  current: number | null;
  prev: number | null;
  asOf?: string | null;
  // 헤더 우측 sparkline 용 종가 시계열 (오래된 → 최신 순). 비어 있으면 미표시.
  series?: number[];
  // social-proof — "오늘 N명이 봤어요" 배지. null/0 이면 숨김.
  viewsToday?: number | null;
};

export function PriceHero({
  name,
  code,
  market,
  current,
  prev,
  asOf,
  series,
  viewsToday,
}: Props) {
  const change = current != null && prev != null ? current - prev : null;
  const pct = change != null && prev ? (change / prev) * 100 : null;
  const tone =
    change == null || change === 0
      ? "text-zinc-400"
      : change > 0
        ? "text-rose-400"
        : "text-sky-400";
  const arrow = change == null || change === 0 ? "—" : change > 0 ? "▲" : "▼";

  return (
    <div className="mb-5 flex items-end justify-between gap-4">
      <div>
        <div className="text-xs text-zinc-500">
          {code} · {market}
        </div>
        <h1 className="mt-0.5 text-2xl font-bold tracking-tight text-zinc-50">
          {name}
        </h1>
        <div className="mt-3 flex items-baseline gap-3">
          <span className="text-4xl font-semibold tabular-nums text-zinc-50">
            {current != null ? current.toLocaleString() : "-"}
          </span>
          {change != null && pct != null && (
            <span className={`text-base font-medium tabular-nums ${tone}`}>
              {arrow} {Math.abs(change).toLocaleString()}{" "}
              ({pct >= 0 ? "+" : ""}
              {pct.toFixed(2)}%)
            </span>
          )}
        </div>
        <div className="mt-1 flex items-center gap-2 text-xs text-zinc-500">
          {asOf && <span>기준 {asOf}</span>}
          {viewsToday != null && viewsToday > 0 && (
            <span className="rounded-full border border-zinc-700/70 bg-zinc-900/60 px-2 py-0.5 text-[11px] text-zinc-300">
              오늘 <span className="tabular-nums text-zinc-100">
                {viewsToday.toLocaleString()}
              </span>
              명이 봤어요
            </span>
          )}
        </div>
      </div>

      {series && series.length >= 2 && (
        <Sparkline
          values={series}
          stroke={change != null && change < 0 ? "#3b82f6" : "#ef4444"}
        />
      )}
    </div>
  );
}