l-x/gonzalez

<?php

namespace Gonzalez;

/**
 * Class Runner
 *
 * @package Gonzalez
 */
class Runner {

    /**
     * @var float
     */
    private $calibration_time = 0.0;

    /**
     * @var callable
     */
    private $callback;

    /**
     * @var array|\Traversable
     */
    private $data_provider = [[null]];

    /**
     * @param callable $callback
     */
    public function __construct(callable $callback) {
        $this->callback = $callback;
    }

    /**
     * @param float $milliseconds
     *
     * @return $this
     */
    public function setCalibrationTime($milliseconds) {
        $this->calibration_time = $milliseconds;

        return $this;
    }

    /**
     * @return float
     */
    public function getCalibrationTime() {
        return $this->calibration_time;
    }

    /**
     * @param array|\Traversable $data_provider
     *
     * @return $this
     */
    public function setDataProvider($data_provider) {
        $this->data_provider = $data_provider;

        return $this;
    }

    /**
     * @return float Current time in milliseconds
     */
    private function millitime() {
        return microtime(true) * 1000;
    }

    /**
     * @param callable $callback
     * @param array $arguments
     *
     * @return float
     */
    private function timeIt() {
        $time = 0.0;
        foreach ($this->data_provider as $arguments) {
            $t0 = $this->millitime();
            call_user_func_array($this->callback, $arguments);
            $t1 = $this->millitime();
            $delta = $t1 - $t0;
            $adjusted = $delta - $this->calibration_time;

            $time += $adjusted;
        }

        return $time;
    }

    /**
     * @param int $iterations
     *
     * @return float[]
     */
    public function run($iterations) {
        $results = [];
        for ($i = 0; $i < $iterations; $i++) {
            $results[] = $this->timeIt();
        }

        return $results;
    }

    /**
     * @param float $milliseconds
     *
     * @return float[]
     */
    public function runFor($milliseconds) {
        $results = [];
        $run_time = 0.0;

        while ($run_time < $milliseconds) {
            $result = $this->timeIt();
            $results[] = $result;
            $run_time += $result;
        }

        return $results;
    }
}