import type { CalcuttaPayoutRuleProps } from '@bettoredge/types';

export const calculatePayoutPreview = (
    total_pot: number,
    rules: CalcuttaPayoutRuleProps[]
): { description: string; payout_pct: number; payout_amount: number }[] => {
    return rules.map(rule => ({
        description: rule.description || `${rule.payout_type === 'round' ? `Round ${rule.round_number}` : `${rule.placement}${getOrdinal(rule.placement || 0)} Place`}`,
        payout_pct: Number(rule.payout_pct),
        payout_amount: (total_pot * Number(rule.payout_pct)) / 100,
    }));
};

export const validatePayoutRules = (rules: CalcuttaPayoutRuleProps[]): string[] => {
    const errors: string[] = [];
    if (rules.length === 0) {
        errors.push('At least one payout rule is required');
        return errors;
    }

    const totalPct = rules.reduce((sum, r) => sum + Number(r.payout_pct), 0);
    if (Math.abs(totalPct - 100) > 0.01) {
        errors.push(`Payout percentages must sum to 100% (currently ${totalPct.toFixed(1)}%)`);
    }

    for (const rule of rules) {
        if (Number(rule.payout_pct) <= 0) {
            errors.push(`Payout percentage must be greater than 0`);
        }
    }

    return errors;
};

const getOrdinal = (n: number): string => {
    const suffixes = ['th', 'st', 'nd', 'rd'];
    const v = n % 100;
    return suffixes[(v - 20) % 10] || suffixes[v] || suffixes[0];
};