<?php
/**
 * Created by PhpStorm.
 * User: Terry
 * Date: 5/1/2017
 * Time: 10:33 AM
 */

namespace Peanut;
use Tops\sys\TKeyValuePair;
use Tops\sys\TLanguage;
use Tops\sys\TPath;
use Tops\sys\TStrings;
use Peanut\sys\ViewModelManager;

class Bootstrap
{
    /**
     * scriptDirectoryLevel constant.
     *
     * The following routine determines the path from which all the rest are offset.
     * Usually this is the document root but the whole system might be copied into a subdirectory.  E.g.  /TestSite
     * If this script is located at 'application/settings' scriptDirectoryLevel = 2 but if
     * I moved it to sites/all/modules/peanut/configuration, scriptDirectoryLevel should = 5
     *
     * Adjust accordingly if you move the file.
     */
    const scriptDirectoryLevel = 2;

    private static function toPsr4Namespace($ns)
    {
        if (empty($ns)) {
            return '\\';
        }
        if (strpos($ns, '\\') === 0) {
            $ns = substr($ns,1);
        }
        if (substr($ns,-1) != '\\') {
            $ns .= '\\';
        }
        return $ns;
    }
    public static function initialize($fileRoot=null) {
        if ($fileRoot == null) {
            $fileRoot = __DIR__;
            for ($i = 0; $i < self::scriptDirectoryLevel; $i++) {
                $fileRoot .= '/..';
            }
            $fileRoot = realpath($fileRoot);
            if ($fileRoot === false) {
                throw new \Exception('Cannot determine file root location.');
            }
            $fileRoot .= '/';
        }
        else if (substr($fileRoot,-1) != '/') {
            $fileRoot .= '/';
        }

        $settings = self::getSettings();
        $topsRoot = $settings->topsLocation;
        $loader = Autoloader::getInstance();
        $loader->addPsr4('Tops',$fileRoot.$topsRoot);
        $loader->addPsr4('Peanut',$fileRoot.$settings->peanutSrcLocation);
        $packages = ViewModelManager::getPackageList();
        if (!empty($packages)) {
            $packagePath = ViewModelManager::getPackagePath();
            foreach ($packages as $package) {
                $namespace = TStrings::toCamelCase($package);
                $srcRoot = $fileRoot.$packagePath."/$package/src";
                $loader->addPsr4('Peanut\\'.$namespace.'\\', $srcRoot);
            }
        }

        foreach ($settings->autoloadItems as $namespace => $srcRoot) {
            $srcRoot = str_replace('[pnut-src]',$settings->srcLocation,$srcRoot);
            $srcRoot = str_replace('[app-src]',$fileRoot.'application/src',$srcRoot);
            $loader->addPsr4($namespace . '\\', $fileRoot.$srcRoot);
        }

        TPath::Initialize($fileRoot);

        // note: these lines needed for Tops security token handling.
        // however on some CMS systems (e.g. Concrete5) it interferes with the CMS'
        // session handling.  Call \Tops\sys\TSession::Initialize() after the session has been started.
        // usually in module startup code.
        // session_start();
        // \Tops\sys\TSession::Initialize();

        $translations = TLanguage::getTranslations(
            array(
                'wait-please',
                'wait-action-loading',
                'wait-action-update',
                'wait-action-add',
                'wait-action-delete'
            )
        );

        TKeyValuePair::CreateCookie($translations,'peanutTranslations');

        return $settings;
    }
    public static function getSettings()
    {
        $parts = explode('/', $_SERVER['PHP_SELF']);
        for ($i = 0; $i <= self::scriptDirectoryLevel; $i++) {
            array_pop($parts);
        }
        $root = join('/', $parts) . '/';

        $ini = parse_ini_file(__DIR__ . '/settings.ini', true);

        $settings = $ini['peanut'];
        $result = new \stdClass();

        $libDefaults = array(
            'lodash' => 'https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.4/lodash.min.js'
        );
        if (empty($ini['libraries'])) {
            $result->libraries = $libDefaults;
        }
        else {
            $result->libraries = $ini['libraries'];
            foreach ($libDefaults as $key => $value) {
                if (!array_key_exists($key,$result->libraries)) {
                    $result->libraries[$key] = $value;
                }
            }
        }

        $modulePath = (empty($settings['modulePath']) ? 'modules' : $settings['modulePath']);
        $peanutRoot = (empty($settings['peanutRootPath']) ? "$modulePath/pnut" : $settings['peanutRootPath']);
        $peanutPath = $root . $peanutRoot;
        $mvvmPath = $root . (empty($settings['mvvmPath']) ? 'application/mvvm' : $settings['mvvmPath']);
        $corePath = $root . (empty($settings['corePath']) ? $peanutRoot . '/core' : $settings['corePath']);
        $packagePath = $root . (empty($settings['packagePath']) ? $peanutRoot . "/packages" : $settings['packagePath']);
        $srcLocation = empty($ini['locations']['src']) ? "$modulePath/src" : $ini['locations']['src'];
        if (isset($settings['optimize'])) {
            $optimize = $settings['optimize'] == 0 ? false : true;
        } else {
            $optimize = true;
        }

        if ($optimize) {
            $result->dependencies = $peanutPath . '/dist/peanut.min.js';
        } else {
            $result->dependencies = "$corePath/KnockoutHelper.js,$corePath/WaitMessage.js,$corePath/App.js,$corePath/Services.js,$corePath/ViewModelBase.js";
        }
        if (!empty($settings["dependencies"])) {
            $result->dependencies .= ',' . $settings["dependencies"];
            $result->dependencies =
                str_replace("@pnut", $peanutPath
                    , str_replace("@app", $mvvmPath
                        , str_replace("@core", $corePath
                            , str_replace("@pkg", $packagePath
                                , $settings["dependencies"]))));
        }

        $result->applicationVersionNumber = empty($settings['applicationVersionNumber']) ? '0.0' : $settings['applicationVersionNumber'];
        $result->commonRootPath = $root;
        $result->applicationPath = $root.'application/';
        $result->libraryPath = empty($settings['libraryPath']) ?  $result->applicationPath."assets/js/libraries/" : $settings['libraryPath'].'/';
        $result->peanutRootPath = $peanutPath . '/';
        $result->corePath = $peanutPath . '/core/';
        $result->packagePath = $packagePath . '/';
        $result->mvvmPath = $mvvmPath . '/';
        $result->serviceUrl = empty($settings['serviceUrl']) ? '/peanut/service/execute' : $settings['serviceUrl'];
        $result->vmNamespace = empty($settings['vmNamespace']) ? 'Peanut' : $settings['vmNamespace'];
        $result->uiExtension = empty($settings['uiExtension']) ? 'BootstrapFA' : $settings['uiExtension'];
        $result->srcLocation = $srcLocation;
        $result->topsLocation = empty($ini['locations']['tops']) ? "$srcLocation/tops" : $ini['locations']['tops'];
        $result->peanutSrcLocation = "$srcLocation/peanut";
        $result->autoloadItems=empty($ini['autoload']) ? array() : $ini['autoload'];
        $result->peanutUrl = empty($ini['pages']['peanutUrl']) ? 'peanut' : $ini['pages']['peanutUrl'];
        if (empty($settings['loggingMode'])) {
            $result->loggingMode = $optimize ? 'none' : 'verbose';
        } else {
            $result->loggingMode = $settings['loggingMode'];
        }
        $result->optimize = $optimize;

        return $result;
    }
}

/**
 * Use this standard ps4 autoloader if not using Composer Autoload.
 *
 * Adapted from: https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-4-autoloader-examples.md
 * Added static method Autoloader::LoadTops
 *
 * Example:
 *    $loader = include __DIR__."(relative /../)tops/lib/Autoloader.php";
 *     // add additional namespaces:
 *    $loader->addNamespace('Bookstore', $boostoreSrcPath);
 *
 * An example of a general-purpose implementation that includes the optional
 * functionality of allowing multiple base directories for a single namespace
 * prefix.
 *
 * Given a foo-bar package of classes in the file system at the following
 * paths ...
 *
 *     /path/to/packages/foo-bar/
 *         src/
 *             Baz.php             # Foo\Bar\Baz
 *             Qux/
 *                 Quux.php        # Foo\Bar\Qux\Quux
 *         tests/
 *             BazTest.php         # Foo\Bar\BazTest
 *             Qux/
 *                 QuuxTest.php    # Foo\Bar\Qux\QuuxTest
 *
 * ... add the path to the class files for the \Foo\Bar\ namespace prefix
 * as follows:
 *
 *      <?php
 *      // instantiate the loader
 *      $loader = new \Example\Psr4AutoloaderClass;
 *
 *      // register the autoloader
 *      $loader->register();
 *
 *      // register the base directories for the namespace prefix
 *      $loader->addNamespace('Foo\Bar', '/path/to/packages/foo-bar/src');
 *      $loader->addNamespace('Foo\Bar', '/path/to/packages/foo-bar/tests');
 *
 * The following line would cause the autoloader to attempt to load the
 * \Foo\Bar\Qux\Quux class from /path/to/packages/foo-bar/src/Qux/Quux.php:
 *
 *      <?php
 *      new \Foo\Bar\Qux\Quux;
 *
 * The following line would cause the autoloader to attempt to load the
 * \Foo\Bar\Qux\QuuxTest class from /path/to/packages/foo-bar/tests/Qux/QuuxTest.php:
 *
 *      <?php
 *      new \Foo\Bar\Qux\QuuxTest;
 */
class Autoloader
{
    private static $instance;
    public static function getInstance() {
        if (!isset(self::$instance)) {
            self::$instance = new Autoloader();
            self::$instance->register();
        }
        return self::$instance;
    }

    /**
     * An associative array where the key is a namespace prefix and the value
     * is an array of base directories for classes in that namespace.
     *
     * @var array
     */
    protected $prefixes = array();

    /**
     * Register loader with SPL autoloader stack.
     *
     * @return void
     */
    public function register()
    {
        spl_autoload_register(array($this, 'loadClass'));
    }

    /**
     * Adds a base directory for a namespace prefix.
     *
     * @param string $prefix The namespace prefix.
     * @param string $base_dir A base directory for class files in the
     * namespace.
     * @param bool $prepend If true, prepend the base directory to the stack
     * instead of appending it; this causes it to be searched first rather
     * than last.
     * @return void
     */
    public function addNamespace($prefix, $base_dir, $prepend = false)
    {
        // normalize namespace prefix
        $prefix = trim($prefix, '\\') . '\\';

        // normalize the base directory with a trailing separator
        $base_dir = rtrim($base_dir, DIRECTORY_SEPARATOR) . '/';

        // initialize the namespace prefix array
        if (isset($this->prefixes[$prefix]) === false) {
            $this->prefixes[$prefix] = array();
        }

        // retain the base directory for the namespace prefix
        if ($prepend) {
            array_unshift($this->prefixes[$prefix], $base_dir);
        } else {
            array_push($this->prefixes[$prefix], $base_dir);
        }
    }

    // alias for addNamespace - simulates composer autoloader syntax
    public function addPsr4($prefix, $base_dir, $prepend = false)  {
        $this->addNamespace($prefix,$base_dir);
    }

    /**
     * Loads the class file for a given class name.
     *
     * @param string $class The fully-qualified class name.
     * @return mixed The mapped file name on success, or boolean false on
     * failure.
     */
    public function loadClass($class)
    {
        // the current namespace prefix
        $prefix = $class;

        // work backwards through the namespace names of the fully-qualified
        // class name to find a mapped file name
        while (false !== $pos = strrpos($prefix, '\\')) {

            // retain the trailing namespace separator in the prefix
            $prefix = substr($class, 0, $pos + 1);

            // the rest is the relative class name
            $relative_class = substr($class, $pos + 1);

            // try to load a mapped file for the prefix and relative class
            $mapped_file = $this->loadMappedFile($prefix, $relative_class);
            if ($mapped_file) {
                return $mapped_file;
            }

            // remove the trailing namespace separator for the next iteration
            // of strrpos()
            $prefix = rtrim($prefix, '\\');
        }

        // never found a mapped file
        return false;
    }

    /**
     * Load the mapped file for a namespace prefix and relative class.
     *
     * @param string $prefix The namespace prefix.
     * @param string $relative_class The relative class name.
     * @return mixed Boolean false if no mapped file can be loaded, or the
     * name of the mapped file that was loaded.
     */
    protected function loadMappedFile($prefix, $relative_class)
    {
        // are there any base directories for this namespace prefix?
        if (isset($this->prefixes[$prefix]) === false) {
            return false;
        }

        // look through base directories for this namespace prefix
        foreach ($this->prefixes[$prefix] as $base_dir) {

            // replace the namespace prefix with the base directory,
            // replace namespace separators with directory separators
            // in the relative class name, append with .php
            $file = $base_dir
                . str_replace('\\', '/', $relative_class)
                . '.php';

            // if the mapped file exists, require it
            if ($this->requireFile($file)) {
                // yes, we're done
                return $file;
            }
        }

        // never found it
        return false;
    }

    /**
     * If a file exists, require it from the file system.
     *
     * @param string $file The file to require.
     * @return bool True if the file exists, false if not.
     */
    protected function requireFile($file)
    {
        if (file_exists($file)) {
            require $file;
            return true;
        }
        return false;
    }
}
