<?php
/**
 * Make an offer, the pure part: what to do with an offer by itself. No WordPress here.
 */

if (!defined('ABSPATH')) {
    exit;
}

/**
 * 'accept', 'decline' or 'review' (the shop decides). `$cfg`: accept (% of the price at
 * or above which an offer is taken, 0 for never), decline (% below which it is turned
 * down), floor_pct (over the purchase price: never below it, whatever the price).
 */
function usedkit_offer_decision($amount, $price, $cost, $cfg) {
    if ($amount <= 0 || $price <= 0) {
        return 'decline';
    }
    $floor = ($cost !== null && $cost > 0) ? $cost * (1 + $cfg['floor_pct'] / 100) : 0.0;
    if ($amount < $floor - 0.001 || $amount < $price * $cfg['decline'] / 100 - 0.001) {
        return 'decline';
    }
    if ($cfg['accept'] > 0 && $amount >= $price * $cfg['accept'] / 100 - 0.001) {
        return 'accept';
    }
    return 'review';
}