/**
 * Generate progressive warm-up schedule.
 *
 * @param int $targetVolumePerIp  Total email per IP selama masa warm-up
 * @param int $days               Jumlah hari warm-up (default: 14)
 * @return array                  Volume harian (progressive)
 */
function generateProgressiveWarmupSchedule(int $targetVolumePerIp, int $days = 14): array
{
    // Distribusi bobot eksponensial per hari (misalnya pangkat 1.5)
    $weights = [];
    $sumWeights = 0;

    for ($i = 1; $i <= $days; $i++) {
        $weight = pow($i, 1.5); // makin ke akhir makin besar
        $weights[] = $weight;
        $sumWeights += $weight;
    }

    // Hitung volume per hari berdasarkan proporsi bobot
    $schedule = [];
    $accumulated = 0;

    for ($i = 0; $i < $days; $i++) {
        $volume = floor(($weights[$i] / $sumWeights) * $targetVolumePerIp);
        $schedule[] = $volume;
        $accumulated += $volume;
    }

    // Distribusi sisa (akibat pembulatan) ke hari-hari akhir
    $remainder = $targetVolumePerIp - $accumulated;
    for ($i = $days - 1; $i >= 0 && $remainder > 0; $i--) {
        $schedule[$i]++;
        $remainder--;
    }

    return $schedule;
}