import type { VirtualTargetItem } from './virtualTradingStorage';

/** 종목 전략 셀렉트 — 기본(전역) 전략 옵션 값 */
export const VIRTUAL_DEFAULT_STRATEGY_VALUE = '__default__';

/** 종목에 전략이 지정되지 않았으면 전역(기본) 전략 ID */
export function resolveVirtualTargetStrategyId(
  target: Pick<VirtualTargetItem, 'strategyId'>,
  globalStrategyId: number | null,
): number | null {
  if (target.strategyId != null) return target.strategyId;
  return globalStrategyId;
}

export function usesDefaultStrategy(target: Pick<VirtualTargetItem, 'strategyId'>): boolean {
  return target.strategyId == null;
}

export function targetStrategySelectValue(target: Pick<VirtualTargetItem, 'strategyId'>): string {
  return target.strategyId != null ? String(target.strategyId) : VIRTUAL_DEFAULT_STRATEGY_VALUE;
}

export function parseTargetStrategySelectValue(value: string): number | null {
  if (!value || value === VIRTUAL_DEFAULT_STRATEGY_VALUE) return null;
  const n = Number(value);
  return Number.isFinite(n) ? n : null;
}

export function defaultStrategyOptionLabel(
  globalStrategyId: number | null,
  strategies: Array<{ id?: number; name?: string }>,
): string {
  if (globalStrategyId == null) return '기본 전략 (미설정)';
  const name = strategies.find(s => s.id === globalStrategyId)?.name;
  return name ? `기본 전략 (${name})` : '기본 전략';
}

/**
 * 예전에 전역 전략 ID가 종목에 복사 저장된 항목 → null(기본 전략 따름)로 정규화
 */
export function coalesceTargetsToDefaultStrategy(
  targets: VirtualTargetItem[],
  globalStrategyId: number | null,
): VirtualTargetItem[] {
  if (globalStrategyId == null) return targets;
  let changed = false;
  const next = targets.map(t => {
    if (t.strategyId != null && t.strategyId === globalStrategyId) {
      changed = true;
      return { ...t, strategyId: null };
    }
    return t;
  });
  return changed ? next : targets;
}