/**
 * 실시간 차트 상단·우측 현재가·등락률 (크로스헤어와 분리, 업비트 티커 우선)
 */
import type { TickerData } from '../hooks/useMarketTicker';
import type { OHLCVBar } from '../types';
import { formatUpbitKrwPrice } from './safeFormat';

export interface ChartLiveQuote {
  price: number | null;
  /** 전일 대비 등락률 (%) */
  changePct: number | null;
  isUp: boolean;
}

export function resolveChartLiveQuote(
  ticker: TickerData | undefined | null,
  lastBar: OHLCVBar | null,
  bars: OHLCVBar[],
): ChartLiveQuote {
  const price =
    ticker?.tradePrice != null && Number.isFinite(ticker.tradePrice)
      ? ticker.tradePrice
      : lastBar?.close ?? null;

  if (ticker?.changeRate != null && Number.isFinite(ticker.changeRate)) {
    const changePct = ticker.changeRate * 100;
    return { price, changePct, isUp: ticker.changeRate >= 0 };
  }

  if (lastBar && bars.length > 1) {
    const prevClose = bars[bars.length - 2].close;
    if (prevClose > 0) {
      const ch = lastBar.close - prevClose;
      const changePct = (ch / prevClose) * 100;
      return { price, changePct, isUp: ch >= 0 };
    }
  }

  const isUp = lastBar ? lastBar.close >= lastBar.open : true;
  return { price, changePct: null, isUp };
}

export function formatChartLivePrice(price: number | null): string {
  if (price == null || !Number.isFinite(price)) return '—';
  return `${formatUpbitKrwPrice(price)} KRW`;
}

export function formatChartLiveChangePct(changePct: number | null): string {
  if (changePct == null || !Number.isFinite(changePct)) return '';
  const up = changePct >= 0;
  return `${up ? '▲' : '▼'} ${Math.abs(changePct).toFixed(2)}%`;
}