/**
* Find price separator for the quantile
*
* @param int $quantileNumber should be from 1 to n-1 where n is number of intervals
* @return array|null
*/
protected function _findPriceSeparator($quantileNumber)
{
if ($quantileNumber < 1 || $quantileNumber >= $this->getIntervalsNumber()) {
return null;
}
$prices = array();
$quantileInterval = $this->_getQuantileInterval($quantileNumber);
$intervalPricesCount = $quantileInterval[1] - $quantileInterval[0] + 1;
$offset = $quantileInterval[0];
if (!is_null($this->_lastPriceLimiter[0])) {
$offset -= $this->_lastPriceLimiter[0];
}
if ($offset < 0) {
$intervalPricesCount += $offset;
$prices = array_slice($this->_prices, $this->_lastPriceLimiter[0] + $offset - $this->_quantileInterval[0], -$offset);
$offset = 0;
}
$lowerPrice = $this->_lastPriceLimiter[1];
if (!is_null($this->_lowerLimit)) {
$lowerPrice = max($lowerPrice, $this->_lowerLimit);
}
if ($intervalPricesCount >= 0) {
$prices = array_merge($prices, $this->_pricesModel->loadPrices($intervalPricesCount + 1, $offset, $lowerPrice, $this->_upperLimit));
}
$lastPrice = $prices[$intervalPricesCount - 1];
$bestRoundPrice = array();
if ($lastPrice == $prices[0]) {
if ($quantileNumber == 1 && $offset) {
$additionalPrices = $this->_pricesModel->loadPreviousPrices($lastPrice, $quantileInterval[0], $this->_lowerLimit);
if ($additionalPrices) {
$quantileInterval[0] -= count($additionalPrices);
$prices = array_merge($additionalPrices, $prices);
$bestRoundPrice = $this->_findRoundPrice($prices[0] + Mage_Catalog_Model_Resource_Layer_Filter_Price::MIN_POSSIBLE_PRICE / 10, $lastPrice, false);
}
}
if ($quantileNumber == $this->getIntervalsNumber() - 1) {
$pricesCount = count($prices);
if ($prices[$pricesCount - 1] > $lastPrice) {
$additionalPrices = array($prices[$pricesCount - 1]);
} else {
$additionalPrices = $this->_pricesModel->loadNextPrices($lastPrice, $this->_count - $quantileInterval[0] - count($prices), $this->_upperLimit);
}
if ($additionalPrices) {
$quantileInterval[1] = $quantileInterval[0] + count($prices) - 1;
if ($prices[$pricesCount - 1] <= $lastPrice) {
$quantileInterval[1] += count($additionalPrices);
$prices = array_merge($prices, $additionalPrices);
}
$upperBestRoundPrice = $this->_findRoundPrice($lastPrice + Mage_Catalog_Model_Resource_Layer_Filter_Price::MIN_POSSIBLE_PRICE / 10, $prices[count($prices) - 1], false);
$this->_mergeRoundPrices($bestRoundPrice, $upperBestRoundPrice);
}
}
} else {
$bestRoundPrice = $this->_findRoundPrice($prices[0] + Mage_Catalog_Model_Resource_Layer_Filter_Price::MIN_POSSIBLE_PRICE / 10, $lastPrice);
}
$this->_quantileInterval = $quantileInterval;
$this->_prices = $prices;
if (empty($bestRoundPrice)) {
$this->_skippedQuantilesUpperLimits[$quantileNumber] = $quantileInterval[1];
return $bestRoundPrice;
}
$pricesCount = count($prices);
if ($prices[$pricesCount - 1] > $lastPrice) {
$this->_lastPriceLimiter = array($quantileInterval[0] + $pricesCount - 1, $prices[$pricesCount - 1]);
}
ksort($bestRoundPrice, SORT_NUMERIC);
foreach ($bestRoundPrice as $index => &$bestRoundPriceValues) {
if (empty($bestRoundPriceValues)) {
unset($bestRoundPrice[$index]);
} else {
sort($bestRoundPriceValues);
}
}
return array_reverse($bestRoundPrice);
}
