<?php

class BetterNavigator extends DataExtension {

    /**
     * Nominate developers who can access developer tools on live site
     * Example YAML:
     *
     * BetterNavigator:
     *   developers:
     *     - 'dev@yoursite.com'
     *     - 'otherdev@yoursite.com'
     *
     * @config
     * @var array
     */
    private static $developers;

    /**
     * Provides a front-end utility menu with administrative functions and developer tools
     * Relies on SilverStripeNavigator
     *
     * @return string
     */
    public function BetterNavigator() {
        $isDev = Director::isDev();

        if($isDev || Permission::check('CMS_ACCESS_CMSMain') || Permission::check('VIEW_DRAFT_CONTENT')) {
            if($this->owner && $this->owner->dataRecord && $this->owner->dataRecord instanceof SiteTree) {

                //Get SilverStripeNavigator links & stage info (CMS/Stage/Live/Archive)
                $nav = array();
                $viewing = '';
                $navigator = new SilverStripeNavigator($this->owner->dataRecord);
                $items = $navigator->getItems();
                foreach($items as $item) {
                    $name = $item->getName();
                    $active = $item->isActive();
                    $nav[$name] = array(
                        'Link' => $item->getLink(),
                        'Active' => $active
                    );
                    if ($active) {
                        if ($name == 'LiveLink') $viewing = 'Live';
                        if ($name == 'StageLink') $viewing = 'Draft';
                        if ($name == 'ArchiveLink') $viewing = 'Archived';
                    }
                }

                //Is the logged in member nominated as a developer?
                $member = Member::currentUser();
                $devs = Config::inst()->get('BetterNavigator', 'developers');
                $isDeveloper = $member && is_array($devs) ? in_array($member->Email, $devs) : false;

                //Add other data for template
                $backURL = '?BackURL=' . urlencode($this->owner->Link());
                $bNData = array_merge($nav, array(
                    'Member' => $member,
                    'Stage' => Versioned::current_stage(),
                    'Viewing' => $viewing, // What we're viewing doesn't necessarily align with the active Stage
                    'LoginLink' => Config::inst()->get('Security', 'login_url') . $backURL,
                    'LogoutLink' => 'Security/logout' . $backURL,
                    'Mode' => Director::get_environment_type(),
                    'IsDeveloper' => $isDeveloper
                ));

                //Merge with page data, send to template and render
                $bNData = new ArrayData($bNData);
                $page = $this->owner->customise(array('BetterNavigator' => $bNData));
                return $page->renderWith('BetterNavigator');
            }
        }
        return false;
    }
}