<?php
namespace Concrete\Core\Page;

use Concrete\Core\Entity\Site\Site;
use Concrete\Core\Site\Tree\TreeInterface;
use Page as CorePage;
use Loader;
use Environment;
use Package;

/**
 * SinglePage extends the page class for those instances of pages that have no type, and are special "single pages"
 * within the system.
 *
 * \@package Pages
 */
class Single
{
    // These are pages that you're allowed to override with templates set in themes
    public static function getThemeableCorePages()
    {
        $themeableCorePages = array('download_file.php', 'login.php', 'maintenance.php', 'members.php', 'page_forbidden.php', 'page_not_found.php', 'register.php', 'upgrade.php', 'user_error.php');

        return $themeableCorePages;
    }

    public static function getListByPackage($pkg)
    {
        $db = Loader::db();
        $r = $db->Execute("select cID from Pages where cFilename is not null and pkgID = ?", array($pkg->getPackageID()));
        $singlePages = array();
        while ($row = $r->FetchRow()) {
            $singlePages[] = CorePage::getByID($row['cID']);
        }

        return $singlePages;
    }

    public static function sanitizePath($path)
    {
        //takes a damn cpath and returns no first slash, and no more than 1 intermediate slash in
        // the middle at any point
        $node = preg_replace("/([\/]+)/", "/", $path);
        if (substr($node, 0, 1) == "/") {
            $node = substr($node, 1);
        }
        // now do the same for the last node
        if (substr($node, strlen($node) - 1, 1) == '/') {
            $node = substr($node, 0, strlen($node) - 1);
        }

        return $node;
    }

    public static function getPathToNode($node, $pkg)
    {
        $node = static::sanitizePath($node);
        // checks to see whether a passed $node is a static content node
        // (static content nodes exist within the views directory)

        // first, we look to see if the exact path exists (plus .php)
        $pathToFile = null;
        if (is_object($pkg)) {
            if (is_dir(DIR_PACKAGES . '/' . $pkg->getPackageHandle())) {
                $dirp = DIR_PACKAGES . '/' . $pkg->getPackageHandle();
            } else {
                $dirp = DIR_PACKAGES_CORE . '/' . $pkg->getPackageHandle();
            }

            $file1 = $dirp . '/' . DIRNAME_PAGES . '/' . $node . '/' . FILENAME_COLLECTION_VIEW;
            $file2 = $dirp . '/' . DIRNAME_PAGES . '/' . $node . '.php';
        } else {
            $file1 = DIR_FILES_CONTENT . '/' . $node . '/' . FILENAME_COLLECTION_VIEW;
            $file2 = DIR_FILES_CONTENT . '/' . $node . '.php';
            $file3 = DIR_FILES_CONTENT_REQUIRED . '/' . $node . '/' . FILENAME_COLLECTION_VIEW;
            $file4 = DIR_FILES_CONTENT_REQUIRED . '/' . $node . '.php';
        }

        if (file_exists($file1)) {
            $pathToFile = "/{$node}/" . FILENAME_COLLECTION_VIEW;
        } elseif (file_exists($file2)) {
            $pathToFile = "/{$node}.php";
        } elseif (isset($file3) && file_exists($file3)) {
            $pathToFile = "/{$node}/" . FILENAME_COLLECTION_VIEW;
        } elseif (isset($file4) && file_exists($file4)) {
            $pathToFile = "/{$node}.php";
        }

        if (!$pathToFile) {
            $pathToFile = false;
        }

        return $pathToFile;
    }

    public static function refresh(CorePage $c)
    {
        // takes a generated collection and refreshes it - updates its path, it's cDateModified
        // it's name, it's permissions

        if (!$c->isGeneratedCollection()) {
            return false;
        }

        $pkg = Package::getByID($c->getPackageID());
        $currentPath = $c->getCollectionPath();
        $pathToFile = static::getPathToNode($currentPath, $pkg);

        $txt = Loader::helper('text');

        $data = array();
        $data['cName'] = $txt->unhandle($c->getCollectionHandle());
        $data['cFilename'] = $pathToFile;

        $c->update($data);
        $env = Environment::get();
        $env->clearOverrideCache();
    }

    public static function getByID($cID, $version = 'RECENT')
    {
        $c = Page::getByID($cID, $version);

        return $c;
    }

    /**
     * Adds a single page outside of any site trees. The global=true declaration in content importer XML must come at
     * on the first URL segment, so we don't have to be smart and check to see if the parents already eixst.
     * @param $cPath
     * @param null $pkg
     * @return mixed
     */
    public static function addGlobal($cPath, $pkg = null)
    {
        $pathToFile = static::getPathToNode($cPath, $pkg);
        $txt = Loader::helper('text');
        $c = CorePage::getByPath($cPath);
        if ($c->isError() && $c->getError() == COLLECTION_NOT_FOUND) {
            // create the page at that point in the tree

            $data = array();
            $data['handle'] = trim($cPath, '/');
            $data['name'] = $txt->unhandle($data['handle']);
            $data['filename'] = $pathToFile;
            $data['uID'] = USER_SUPER_ID;
            if ($pkg != null) {
                $data['pkgID'] = $pkg->getPackageID();
            }

            $c = Page::addStatic($data, null);
            $c->moveToRoot();
            return $c;
        }
    }

    public static function createPageInTree($cPath, TreeInterface $tree, $moveToRoot = false, $pkg = null)
    {
        $txt = Loader::helper('text');
        // trim off a leading / if there is one
        $cPath = trim($cPath, '/');

        // now we grab the parent collection, if there is a static one.

        $pages = explode('/', $cPath);

        $parent = $tree->getSiteTreeObject()->getSiteHomePageObject();

        // now we iterate through the pages  to ensure that they exist in the system before adding the new guy

        $pathPrefix = '';
        $checkGlobally = false;

        for ($i = 0; $i < count($pages); ++$i) {
            $currentPath = $pathPrefix . $pages[$i];
            if ($i == 0) {
                // First, we check the first path to see if it falls outside of the root already. If it does,
                // we're not going to check within the site for them
                $rootPage = CorePage::getByPath("/" . $currentPath);
                if (!$rootPage->isError() && $rootPage->getSiteTreeID() == 0) {
                    // That means we've already added this as a system page, like Dashboard, etc... Which means
                    // that we add the subsequent pages globally
                    $checkGlobally = true;
                }
            }

            $pathToFile = static::getPathToNode($currentPath, $pkg);

            // check to see if a page at this point in the tree exists
            if (!$checkGlobally) {
                $c = CorePage::getByPath("/" . $currentPath, 'RECENT', $tree);
            } else {
                $c = CorePage::getByPath("/" . $currentPath);
            }
            if ($c->isError() && $c->getError() == COLLECTION_NOT_FOUND) {
                // create the page at that point in the tree

                $data = array();
                $data['handle'] = $pages[$i];
                $data['name'] = $txt->unhandle($data['handle']);
                $data['filename'] = $pathToFile;
                $data['uID'] = USER_SUPER_ID;
                if ($pkg != null) {
                    $data['pkgID'] = $pkg->getPackageID();
                }

                if ($moveToRoot) {
                    $newC = Page::addStatic($data, $tree);
                    $newC->moveToRoot(); // change cparent ID back to 0
                } else {
                    $newC = Page::addStatic($data, $parent);
                }
                $parent = $newC;
            } else {
                $parent = $c;
            }

            $pathPrefix = $currentPath . '/';
        }

        return $parent;
    }

    /*
     * Adds a new single page at the given path, optionally specify a Package
     * @param string $cPath
     * @param Package $pkg
     * @return Page
     */
    public static function add($cPath, $pkg = null, $moveToRoot = false)
    {

        Loader::helper('concrete/ui')->clearInterfaceItemsCache();

        // instantiate the home collection so we have someplace to add these to
        $sites = \Core::make('site')->getList();
        /**
         * @var $site Site
         */
        foreach($sites as $site) {

            $parent = static::createPageInTree($cPath, $site, $moveToRoot, $pkg);

        }

        $env = Environment::get();
        $env->clearOverrideCache();

        return $parent;
    }

    // returns all pages in the site that are "single"
    public static function getList()
    {
        $db = Loader::db();
        $r = $db->query("select Pages.cID from Pages inner join Collections on Pages.cID = Collections.cID where cFilename is not null order by cDateModified desc");
        $pages = array();
        while ($row = $r->fetchRow()) {
            $c = Page::getByID($row['cID']);
            $pages[] = $c;
        }

        return $pages;
    }
}
