<?php
namespace Elastica\Aggregation;

/**
 * Class DateHistogram.
 *
 * @link https://www.elastic.co/guide/en/elasticsearch/reference/current/search-aggregations-bucket-datehistogram-aggregation.html
 */
class DateHistogram extends Histogram
{
    /**
     * Set time_zone option.
     *
     * @param  string
     *
     * @return $this
     */
    public function setTimezone($timezone)
    {
        return $this->setParam('time_zone', $timezone);
    }

    /**
     * Adjust for granularity of date data.
     *
     * @param int $factor set to 1000 if date is stored in seconds rather than milliseconds
     *
     * @return $this
     */
    public function setFactor($factor)
    {
        return $this->setParam('factor', $factor);
    }

    /**
     * Set offset option.
     *
     * @param string
     *
     * @return $this
     */
    public function setOffset($offset)
    {
        return $this->setParam('offset', $offset);
    }

    /**
     * Set the format for returned bucket key_as_string values.
     *
     * @link https://www.elastic.co/guide/en/elasticsearch/reference/master/search-aggregations-bucket-daterange-aggregation.html#date-format-pattern
     *
     * @param string $format see link for formatting options
     *
     * @return $this
     */
    public function setFormat($format)
    {
        return $this->setParam('format', $format);
    }

    /**
     * Set extended bounds option.
     *
     * @link https://www.elastic.co/guide/en/elasticsearch/reference/current/search-aggregations-bucket-histogram-aggregation.html#search-aggregations-bucket-histogram-aggregation-extended-bounds
     *
     * @param string $min see link for formatting options
     * @param string $max see link for formatting options
     *
     * @return $this
     */
    public function setExtendedBounds($min = '', $max = '')
    {
        $bounds = [];
        $bounds['min'] = $min;
        $bounds['max'] = $max;
        // switch if min is higher then max
        if (strtotime($min) > strtotime($max)) {
            $bounds['min'] = $max;
            $bounds['max'] = $min;
        }

        return $this->setParam('extended_bounds', $bounds);
    }
}