<?php
/**
 * Matomo - free/libre analytics platform
 *
 * @link https://matomo.org
 * @license http://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
 *
 */
namespace Piwik\Tracker;

use Piwik\Common;
use Piwik\Piwik;

class RequestSet
{
    /**
     * The set of visits to track.
     *
     * @var Request[]
     */
    private $requests = null;

    /**
     * The token auth supplied with a bulk visits POST.
     *
     * @var string
     */
    private $tokenAuth = null;

    private $env = array();

    public function setRequests($requests)
    {
        $this->requests = array();

        foreach ($requests as $request) {
            if (empty($request) && !is_array($request)) {
                continue;
            }

            if (!$request instanceof Request) {
                $request = new Request($request, $this->getTokenAuth());
            }

            $this->requests[] = $request;
        }
    }

    public function setTokenAuth($tokenAuth)
    {
        $this->tokenAuth = $tokenAuth;
    }

    public function getNumberOfRequests()
    {
        if (is_array($this->requests)) {
            return count($this->requests);
        }

        return 0;
    }

    public function getRequests()
    {
        if (!$this->areRequestsInitialized()) {
            return array();
        }

        return $this->requests;
    }

    public function getTokenAuth()
    {
        if (!is_null($this->tokenAuth)) {
            return $this->tokenAuth;
        }

        return Common::getRequestVar('token_auth', false);
    }

    private function areRequestsInitialized()
    {
        return !is_null($this->requests);
    }

    public function initRequestsAndTokenAuth()
    {
        if ($this->areRequestsInitialized()) {
            return;
        }

        /**
         * Triggered when detecting tracking requests. A plugin can use this event to set
         * requests that should be tracked by calling the {@link RequestSet::setRequests()} method.
         * For example the BulkTracking plugin uses this event to detect tracking requests and auth token based on
         * a sent JSON instead of default $_GET+$_POST. It would allow you for example to track requests based on
         * XML or you could import tracking requests stored in a file.
         *
         * @param \Piwik\Tracker\RequestSet &$requestSet  Call {@link setRequests()} to initialize requests and
         *                                                {@link setTokenAuth()} to set a detected auth token.
         *
         * @ignore This event is not public yet as the RequestSet API is not really stable yet
         */
        Piwik::postEvent('Tracker.initRequestSet', array($this));

        if (!$this->areRequestsInitialized()) {
            $this->requests = array();

            if (!empty($_GET) || !empty($_POST)) {
                $this->setRequests(array($_GET + $_POST));
            }
        }
    }

    public function hasRequests()
    {
        return !empty($this->requests);
    }

    protected function getAllSiteIdsWithinRequest()
    {
        if (empty($this->requests)) {
            return array();
        }

        $siteIds = array();
        foreach ($this->requests as $request) {
            $siteIds[] = (int) $request->getIdSite();
        }

        return array_values(array_unique($siteIds));
    }

    public function getState()
    {
        $requests = array(
            'requests'  => array(),
            'env'       => $this->getEnvironment(),
            'tokenAuth' => $this->getTokenAuth(),
            'time'      => time()
        );

        foreach ($this->getRequests() as $request) {
            $requests['requests'][] = $request->getRawParams();
        }

        return $requests;
    }

    public function restoreState($state)
    {
        $backupEnv = $this->getCurrentEnvironment();

        $this->setEnvironment($state['env']);
        $this->setTokenAuth($state['tokenAuth']);

        $this->restoreEnvironment();
        $this->setRequests($state['requests']);

        foreach ($this->getRequests() as $request) {
            $request->setCurrentTimestamp($state['time']);
        }

        $this->resetEnvironment($backupEnv);
    }

    public function rememberEnvironment()
    {
        $this->setEnvironment($this->getEnvironment());
    }

    public function setEnvironment($env)
    {
        $this->env = $env;
    }

    protected function getEnvironment()
    {
        if (!empty($this->env)) {
            return $this->env;
        }

        return $this->getCurrentEnvironment();
    }

    public function restoreEnvironment()
    {
        if (empty($this->env)) {
            return;
        }

        $this->resetEnvironment($this->env);
    }

    private function resetEnvironment($env)
    {
        $_SERVER = $env['server'];
        $_COOKIE = isset($env['cookie']) ? $env['cookie'] : array();
    }

    private function getCurrentEnvironment()
    {
        return array(
            'server' => $_SERVER,
            'cookie' => $_COOKIE
        );
    }
}