/**
 * Compute the next trading day's profit target for an account.
 *
 * Path 1 – No positive trading days yet:
 *   target = profitTarget × consistency
 *
 * Path 2 – At least one positive day exists:
 *   maxDay     = highest single-day P&L so far
 *   realTarget = maxDay / consistency  (the total profit at which maxDay ≤ consistency% of total)
 *   needed     = realTarget − totalProfit
 *
 *   if needed > maxDay  → target maxDay (still a long way from the real target; trade a normal day)
 *   else                → target needed (close to the real target; aim for exactly what's left)
 */
export function computeDailyTarget(
    profitTarget: number,
    consistency: number,
    totalProfit: number,
    dailyPnL: { date: string; pnl: number }[]
): { amount: number; path: 'first_day' | 'normal_day' | 'reduced_day' } {
    const positiveDays = dailyPnL.filter((d) => d.pnl > 0);

    if (positiveDays.length === 0) {
        return {
            amount: Math.round(profitTarget * consistency * 100) / 100,
            path: 'first_day',
        };
    }

    const maxDay = Math.max(...positiveDays.map((d) => d.pnl));
    const realTarget = maxDay / consistency;
    const needed = realTarget - totalProfit;

    if (needed > maxDay) {
        return { amount: Math.round(maxDay * 100) / 100, path: 'normal_day' };
    }
    return { amount: Math.round(Math.max(0, needed) * 100) / 100, path: 'reduced_day' };
}