import type { TickerData } from '../hooks/useMarketTicker';
import { getKoreanName } from '../utils/marketNameCache';
import { safePercentFromRate } from '../utils/safeFormat';

export type MoverSortKey = 'gainers' | 'losers' | 'volume';

export function tickerListFromMap(tickers: Map<string, TickerData>): TickerData[] {
  return [...tickers.values()].filter(t => t.market.startsWith('KRW-') && t.tradePrice != null);
}

export function sortTickers(items: TickerData[], key: MoverSortKey, limit = 15): TickerData[] {
  const copy = [...items];
  if (key === 'gainers') {
    return copy
      .filter(t => (t.changeRate ?? 0) > 0)
      .sort((a, b) => (b.changeRate ?? 0) - (a.changeRate ?? 0))
      .slice(0, limit);
  }
  if (key === 'losers') {
    return copy
      .filter(t => (t.changeRate ?? 0) < 0)
      .sort((a, b) => (a.changeRate ?? 0) - (b.changeRate ?? 0))
      .slice(0, limit);
  }
  return copy
    .sort((a, b) => (b.accTradePrice24 ?? 0) - (a.accTradePrice24 ?? 0))
    .slice(0, limit);
}

export function changeColorClass(rate: number | null | undefined): string {
  if (rate == null || rate === 0) return 'wd-muted';
  return rate > 0 ? 'wd-up' : 'wd-down';
}

export function fmtPct(rate: number | null | undefined): string {
  return safePercentFromRate(rate, 2).replace('—', '-');
}

export function fmtKrwShort(n: number | null | undefined): string {
  if (n == null || !Number.isFinite(n)) return '-';
  if (n >= 1_0000_0000) return `${(n / 1_0000_0000).toFixed(1)}억`;
  if (n >= 1_0000) return `${Math.round(n / 1_0000).toLocaleString('ko-KR')}만`;
  return n.toLocaleString('ko-KR', { maximumFractionDigits: 0 });
}

export function resolveName(market: string, ticker?: TickerData): string {
  return ticker?.koreanName || getKoreanName(market) || market.replace('KRW-', '');
}

export function heatmapColor(rate: number | null | undefined): string {
  if (rate == null || rate === 0) return 'rgba(120, 130, 150, 0.35)';
  const intensity = Math.min(1, Math.abs(rate) * 8);
  if (rate > 0) return `rgba(231, 76, 60, ${0.25 + intensity * 0.55})`;
  return `rgba(52, 152, 219, ${0.25 + intensity * 0.55})`;
}