<?php
namespace Grav\Plugin;

use Grav\Common\File\CompiledYamlFile;
use Grav\Common\GPM\GPM;
use Grav\Common\Grav;
use Grav\Common\Inflector;
use Grav\Common\Language\Language;
use Grav\Common\Page\Page;
use Grav\Common\Page\Pages;
use Grav\Common\Plugin;
use Grav\Common\Uri;
use Grav\Common\Utils;
use Grav\Common\User\User;
use Grav\Plugin\Admin\Admin;
use Grav\Plugin\Admin\AdminTwigExtension;
use Grav\Plugin\Admin\Popularity;
use Grav\Plugin\Admin\Themes;
use Grav\Plugin\Admin\AdminController;
use RocketTheme\Toolbox\Event\Event;
use RocketTheme\Toolbox\Session\Session;

class AdminPlugin extends Plugin
{
    public $features = [
        'blueprints' => 1000,
    ];

    /**
     * @var bool
     */
    protected $active = false;

    /**
     * @var string
     */
    protected $template;

    /**
     * @var  string
     */
    protected $theme;

    /**
     * @var string
     */
    protected $route;

    /**
     * @var string
     */
    protected $admin_route;

    /**
     * @var Uri
     */
    protected $uri;

    /**
     * @var Admin
     */
    protected $admin;

    /**
     * @var Session
     */
    protected $session;

    /**
     * @var Popularity
     */
    protected $popularity;

    /**
     * @var string
     */
    protected $base;

    protected $version;

    /**
     * @return array
     */
    public static function getSubscribedEvents()
    {
        if (!Grav::instance()['config']->get('plugins.admin-pro.enabled')) {
            return [
                'onPluginsInitialized' => [['setup', 100000], ['onPluginsInitialized', 1001]],
                'onShutdown'           => ['onShutdown', 1000],
                'onFormProcessed'      => ['onFormProcessed', 0],
                'onAdminDashboard'     => ['onAdminDashboard', 0],
            ];
        }

        return [];
    }

    /**
     * If the admin path matches, initialize the Login plugin configuration and set the admin
     * as active.
     */
    public function setup()
    {
        // Autoloader
        spl_autoload_register(function ($class) {
            if (Utils::startsWith($class, 'Grav\Plugin\Admin')) {
                require_once __DIR__ .'/classes/' . strtolower(basename(str_replace("\\", "/", $class))) . '.php';
            }
        });

        $route = $this->config->get('plugins.admin.route');
        if (!$route) {
            return;
        }

        $this->base = '/' . trim($route, '/');
        $this->admin_route = rtrim($this->grav['pages']->base(), '/') . $this->base;
        $this->uri = $this->grav['uri'];

        // check for existence of a user account
        $account_dir = $file_path = $this->grav['locator']->findResource('account://');
        $user_check = glob($account_dir . '/*.yaml');

        // If no users found, go to register
        if ($user_check == false || count((array)$user_check) == 0) {
            if (!$this->isAdminPath()) {
                $this->grav->redirect($this->admin_route);
            }
            $this->template = 'register';
        }

        // Only activate admin if we're inside the admin path.
        if ($this->isAdminPath()) {
            $this->active = true;

            // Set cache based on admin_cache option
            if (method_exists($this->grav['cache'], 'setEnabled')) {
                $this->grav['cache']->setEnabled($this->config->get('plugins.admin.cache_enabled'));
            }
        }
    }

    /**
     * Validate a value. Currently validates
     *
     * - 'user' for username format and username availability.
     * - 'password1' for password format
     * - 'password2' for equality to password1
     *
     * @param string $type  The field type
     * @param string $value The field value
     * @param string $extra Any extra value required
     *
     * @return bool
     */
    protected function validate($type, $value, $extra = '')
    {
        switch ($type) {
            case 'username_format':
                if (!preg_match('/^[a-z0-9_-]{3,16}$/', $value)) {
                    return false;
                }

                return true;

            case 'password1':
                if (!preg_match('/(?=.*\d)(?=.*[a-z])(?=.*[A-Z]).{8,}/', $value)) {
                    return false;
                }

                return true;

            case 'password2':
                if (strcmp($value, $extra)) {
                    return false;
                }

                return true;
        }

        return false;
    }

    /**
     * Process the admin registration form.
     *
     * @param Event $event
     */
    public function onFormProcessed(Event $event)
    {
        $form = $event['form'];
        $action = $event['action'];

        switch ($action) {

            case 'register_admin_user':

                if (!$this->config->get('plugins.login.enabled')) {
                    throw new \RuntimeException($this->grav['language']->translate('PLUGIN_LOGIN.PLUGIN_LOGIN_DISABLED'));
                }

                $data = [];
                $username = $form->value('username');

                if ($form->value('password1') != $form->value('password2')) {
                    $this->grav->fireEvent('onFormValidationError', new Event([
                            'form'    => $form,
                            'message' => $this->grav['language']->translate('PLUGIN_LOGIN.PASSWORDS_DO_NOT_MATCH')
                        ]));
                    $event->stopPropagation();

                    return;
                }

                $data['password'] = $form->value('password1');

                $fields = [
                    'email',
                    'fullname',
                    'title'
                ];

                foreach ($fields as $field) {
                    // Process value of field if set in the page process.register_user
                    if (!isset($data[$field]) && $form->value($field)) {
                        $data[$field] = $form->value($field);
                    }
                }

                unset($data['password1']);
                unset($data['password2']);

                // Don't store the username: that is part of the filename
                unset($data['username']);

                // Extra lowercase to ensure file is saved lowercase
                $username = strtolower($username);

                $inflector = new Inflector();

                $data['fullname'] = isset($data['fullname']) ? $data['fullname'] : $inflector->titleize($username);
                $data['title'] = isset($data['title']) ? $data['title'] : 'Administrator';
                $data['state'] = 'enabled';
                $data['access'] = ['admin' => ['login' => true, 'super' => true], 'site' => ['login' => true]];

                // Create user object and save it
                $user = new User($data);
                $file = CompiledYamlFile::instance($this->grav['locator']->findResource('user://accounts/' . $username . YAML_EXT,
                    true, true));
                $user->file($file);
                $user->save();
                $user = User::load($username);

                //Login user
                $this->grav['session']->user = $user;
                unset($this->grav['user']);
                $this->grav['user'] = $user;
                $user->authenticated = $user->authorize('site.login');

                $messages = $this->grav['messages'];
                $messages->add($this->grav['language']->translate('PLUGIN_ADMIN.LOGIN_LOGGED_IN'), 'info');
                $this->grav->redirect($this->admin_route);

                break;
        }
    }

    /**
     * If the admin plugin is set as active, initialize the admin
     */
    public function onPluginsInitialized()
    {
        // Only activate admin if we're inside the admin path.
        if ($this->active) {

            // Store this version and prefer newer method
            if (method_exists($this, 'getBlueprint')) {
                $this->version = $this->getBlueprint()->version;
            } else {
                $this->version = $this->grav['plugins']->get('admin')->blueprints()->version;
            }

            // Test for correct Grav 1.1 version
            if (version_compare(GRAV_VERSION, '1.1.0-beta.1', '<')) {
                $messages = $this->grav['messages'];
                $messages->add($this->grav['language']->translate(['PLUGIN_ADMIN.NEEDS_GRAV_1_1', GRAV_VERSION]),
                    'error');
            }

            // Have a unique Admin-only Cache key
            if (method_exists($this->grav['cache'], 'setKey')) {
                $cache = $this->grav['cache'];
                $cache_key = $cache->getKey();
                $cache->setKey($cache_key . '$');
            }

            // Turn on Twig autoescaping
            if (method_exists($this->grav['twig'], 'setAutoescape') && $this->grav['uri']->param('task') != 'processmarkdown') {
                $this->grav['twig']->setAutoescape(true);
            }


            if (php_sapi_name() == 'cli-server') {
                throw new \RuntimeException('The Admin Plugin cannot run on the PHP built-in webserver. It needs Apache, Nginx or another full-featured web server.',
                    500);
            }
            $this->grav['debugger']->addMessage("Admin Basic");
            $this->initializeAdmin();

            // Disable Asset pipelining (old method - remove this after Grav is updated)
            if (!method_exists($this->grav['assets'], 'setJsPipeline')) {
                $this->config->set('system.assets.css_pipeline', false);
                $this->config->set('system.assets.js_pipeline', false);
            }

            // Replace themes service with admin.
            $this->grav['themes'] = function () {
                return new Themes($this->grav);
            };
        }

        // We need popularity no matter what
        $this->popularity = new Popularity();

        // Fire even to register permissions from other plugins
        $this->grav->fireEvent('onAdminRegisterPermissions', new Event(['admin' => $this->admin]));
    }

    protected function initializeController($task, $post)
    {
        $controller = new AdminController();
        $controller->initialize($this->grav, $this->template, $task, $this->route, $post);
        $controller->execute();
        $controller->redirect();
    }

    /**
     * Sets longer path to the home page allowing us to have list of pages when we enter to pages section.
     */
    public function onPagesInitialized()
    {
        $this->session = $this->grav['session'];

        // Set original route for the home page.
        $home = '/' . trim($this->config->get('system.home.alias'), '/');

        // set the default if not set before
        $this->session->expert = $this->session->expert ?: false;

        // set session variable if it's passed via the url
        if ($this->uri->param('mode') == 'expert') {
            $this->session->expert = true;
        } elseif ($this->uri->param('mode') == 'normal') {
            $this->session->expert = false;
        }

        /** @var Pages $pages */
        $pages = $this->grav['pages'];

        $this->grav['admin']->routes = $pages->routes();

        // Remove default route from routes.
        if (isset($this->grav['admin']->routes['/'])) {
            unset($this->grav['admin']->routes['/']);
        }

        $page = $pages->dispatch('/', true);

        // If page is null, the default page does not exist, and we cannot route to it
        if ($page) {
            $page->route($home);
        }

        // Make local copy of POST.
        $post = !empty($_POST) ? $_POST : [];

        // Handle tasks.
        $this->admin->task = $task = !empty($post['task']) ? $post['task'] : $this->uri->param('task');
        if ($task) {
            $this->initializeController($task, $post);
        } elseif ($this->template == 'logs' && $this->route) {
            // Display RAW error message.
            echo $this->admin->logEntry();
            exit();
        }

        $self = $this;

        // make sure page is not frozen!
        unset($this->grav['page']);

        $this->admin->pagesCount();

        // Replace page service with admin.
        $this->grav['page'] = function () use ($self) {
            $page = new Page;

            // If the page cannot be found in other plugins, try looking in admin plugin itself.
            if (file_exists(__DIR__ . "/pages/admin/{$self->template}.md")) {
                $page->init(new \SplFileInfo(__DIR__ . "/pages/admin/{$self->template}.md"));
                $page->slug(basename($self->template));

                return $page;
            }

            // Allows pages added by plugins in admin
            $plugins = $this->grav['plugins'];
            $locator = $this->grav['locator'];

            foreach ($plugins as $plugin) {
                $path = $locator->findResource("user://plugins/{$plugin->name}/admin/pages/{$self->template}.md");

                if ($path) {
                    $page->init(new \SplFileInfo($path));
                    $page->slug(basename($self->template));

                    return $page;
                }
            }

            return null;
        };

        if (empty($this->grav['page'])) {
            if ($this->grav['user']->authenticated) {
                $event = $this->grav->fireEvent('onPageNotFound');

                if (isset($event->page)) {
                    unset($this->grav['page']);
                    $this->grav['page'] = $event->page;
                } else {
                    throw new \RuntimeException('Page Not Found', 404);
                }
            } else {
                $this->grav->redirect($this->admin_route);
            }
        }

        // Explicitly set a timestamp on assets
        $this->grav['assets']->setTimestamp(substr(md5(GRAV_VERSION . $this->grav['config']->checksum()), 0, 10));
    }

    /**
     * Handles initializing the assets
     */
    public function onAssetsInitialized()
    {
        // Disable Asset pipelining
        $assets = $this->grav['assets'];
        $assets->setJsPipeline(false);
        $assets->setCssPipeline(false);
    }

    /**
     * Add twig paths to plugin templates.
     */
    public function onTwigTemplatePaths()
    {
        $twig_paths = [];
        $this->grav->fireEvent('onAdminTwigTemplatePaths', new Event(['paths' => &$twig_paths]));

        $twig_paths[] = __DIR__ . '/themes/' . $this->theme . '/templates';

        $this->grav['twig']->twig_paths = $twig_paths;

    }

    /**
     * Set all twig variables for generating output.
     */
    public function onTwigSiteVariables()
    {
        $twig = $this->grav['twig'];

        $twig->twig_vars['location'] = $this->template;
        $twig->twig_vars['base_url_relative_frontend'] = $twig->twig_vars['base_url_relative'] ?: '/';
        $twig->twig_vars['admin_route'] = trim($this->admin_route, '/');
        $twig->twig_vars['base_url_relative'] = $twig->twig_vars['base_url_simple'] . '/' . $twig->twig_vars['admin_route'];
        $theme_url = '/' . ltrim($this->grav['locator']->findResource('plugin://admin/themes/' . $this->theme,
            false), '/');
        $twig->twig_vars['theme_url'] = $theme_url;
        $twig->twig_vars['base_url'] = $twig->twig_vars['base_url_relative'];
        $twig->twig_vars['base_path'] = GRAV_ROOT;
        $twig->twig_vars['admin'] = $this->admin;
        $twig->twig_vars['admin_version'] = $this->version;

        // Gather Plugin-hooked nav items
        $this->grav->fireEvent('onAdminMenu');

        switch ($this->template) {
            case 'dashboard':
                $twig->twig_vars['popularity'] = $this->popularity;

                // Gather Plugin-hooked dashboard items
                $this->grav->fireEvent('onAdminDashboard');

                break;
        }
    }

    /**
     * Handles the shutdown
     */
    public function onShutdown()
    {
        // Just so we know that we're in this debug mode
        if ($this->config->get('plugins.admin.popularity.enabled')) {

            // Only track non-admin
            if (!$this->active) {
                $this->popularity->trackHit();
            }
        }
    }

    /**
     * Handles getting GPM updates
     */
    public function onTaskGPM()
    {
        $task = 'GPM';
        if (!$this->admin->authorize(['admin.maintenance', 'admin.super'])) {
            $this->admin->json_response = [
                'status'  => 'unauthorized',
                'message' => $this->admin->translate('PLUGIN_ADMIN.INSUFFICIENT_PERMISSIONS_FOR_TASK') . ' ' . $task . '.'
            ];

            return false;
        }

        $action = $_POST['action']; // getUpdatable | getUpdatablePlugins | getUpdatableThemes | gravUpdates
        $flush = isset($_POST['flush']) && $_POST['flush'] == true ? true : false;

        if (isset($this->grav['session'])) {
            $this->grav['session']->close();
        }

        try {
            $gpm = new GPM($flush);

            switch ($action) {
                case 'getUpdates':
                    $resources_updates = $gpm->getUpdatable();
                    if ($gpm->grav != null) {
                        $grav_updates = [
                            "isUpdatable" => $gpm->grav->isUpdatable(),
                            "assets"      => $gpm->grav->getAssets(),
                            "version"     => GRAV_VERSION,
                            "available"   => $gpm->grav->getVersion(),
                            "date"        => $gpm->grav->getDate(),
                            "isSymlink"   => $gpm->grav->isSymlink()
                        ];

                        echo json_encode([
                            "status"  => "success",
                            "payload" => [
                                "resources" => $resources_updates,
                                "grav"      => $grav_updates,
                                "installed" => $gpm->countInstalled(),
                                'flushed'   => $flush
                            ]
                        ]);
                    } else {
                        echo json_encode(["status" => "error", "message" => "Cannot connect to the GPM"]);
                    }
                    break;
            }
        } catch (\Exception $e) {
            echo json_encode(["status" => "error", "message" => $e->getMessage()]);
        }

        exit;
    }

    /**
     * Get list of form field types specified in this plugin. Only special types needs to be listed.
     *
     * @return array
     */
    public function getFormFieldTypes()
    {
        return [
            'column'   => [
                'input@' => false
            ],
            'columns'  => [
                'input@' => false
            ],
            'fieldset' => [
                'input@' => false
            ],
            'section'  => [
                'input@' => false
            ],
            'tab'      => [
                'input@' => false
            ],
            'tabs'     => [
                'input@' => false
            ],
            'key'      => [
                'input@' => false
            ],
            'list'     => [
                'array' => true
            ],
            'file'     => [
                'array' => true
            ]
        ];
    }

    /**
     * Initialize the admin.
     *
     * @throws \RuntimeException
     */
    protected function initializeAdmin()
    {
        $this->enable([
            'onTwigExtensions'           => ['onTwigExtensions', 1000],
            'onPagesInitialized'         => ['onPagesInitialized', 1000],
            'onTwigTemplatePaths'        => ['onTwigTemplatePaths', 1000],
            'onTwigSiteVariables'        => ['onTwigSiteVariables', 1000],
            'onAssetsInitialized'        => ['onAssetsInitialized', 1000],
            'onTask.GPM'                 => ['onTaskGPM', 0],
            'onAdminRegisterPermissions' => ['onAdminRegisterPermissions', 0],
            'onOutputGenerated'          => ['onOutputGenerated', 0],
        ]);

        // Autoload classes
        require_once __DIR__ . '/vendor/autoload.php';


        // Check for required plugins
        if (!$this->grav['config']->get('plugins.login.enabled') || !$this->grav['config']->get('plugins.form.enabled') || !$this->grav['config']->get('plugins.email.enabled')) {
            throw new \RuntimeException('One of the required plugins is missing or not enabled');
        }

        // Initialize Admin Language if needed
        /** @var Language $language */
        $language = $this->grav['language'];
        if ($language->enabled() && empty($this->grav['session']->admin_lang)) {
            $this->grav['session']->admin_lang = $language->getLanguage();
        }

        // Decide admin template and route.
        $path = trim(substr($this->uri->route(), strlen($this->base)), '/');

        if (empty($this->template)) {
            $this->template = 'dashboard';
        }

        // Can't access path directly...
        if ($path && $path != 'register') {
            $array = explode('/', $path, 2);
            $this->template = array_shift($array);
            $this->route = array_shift($array);
        }

        // Initialize admin class.
        $this->admin = new Admin($this->grav, $this->admin_route, $this->template, $this->route);


        // And store the class into DI container.
        $this->grav['admin'] = $this->admin;

        // Double check we have system.yaml, site.yaml etc
        $config_path = $this->grav['locator']->findResource('user://config');
        foreach ($this->admin->configurations() as $config_file) {
            $config_file = "{$config_path}/{$config_file}.yaml";
            if (!file_exists($config_file)) {
                touch($config_file);
            }
        }

        // Get theme for admin
        $this->theme = $this->config->get('plugins.admin.theme', 'grav');

        $assets = $this->grav['assets'];
        $translations = 'this.GravAdmin = this.GravAdmin || {}; if (!this.GravAdmin.translations) this.GravAdmin.translations = {}; ' . PHP_EOL . 'this.GravAdmin.translations.PLUGIN_ADMIN = {';

        // Enable language translations
        $translations_actual_state = $this->config->get('system.languages.translations');
        $this->config->set('system.languages.translations', true);

        $strings = [
            'EVERYTHING_UP_TO_DATE',
            'UPDATES_ARE_AVAILABLE',
            'IS_AVAILABLE_FOR_UPDATE',
            'AND',
            'IS_NOW_AVAILABLE',
            'CURRENT',
            'UPDATE_GRAV_NOW',
            'TASK_COMPLETED',
            'UPDATE',
            'UPDATING_PLEASE_WAIT',
            'GRAV_SYMBOLICALLY_LINKED',
            'OF_YOUR',
            'OF_THIS',
            'HAVE_AN_UPDATE_AVAILABLE',
            'UPDATE_AVAILABLE',
            'UPDATES_AVAILABLE',
            'FULLY_UPDATED',
            'DAYS',
            'PAGE_MODES',
            'PAGE_TYPES',
            'ACCESS_LEVELS',
            'NOTHING_TO_SAVE',
            'FILE_UNSUPPORTED',
            'FILE_ERROR_ADD',
            'FILE_ERROR_UPLOAD',
            'DROP_FILES_HERE_TO_UPLOAD',
            'DELETE',
            'INSERT',
            'UNDO',
            'UNDO',
            'REDO',
            'HEADERS',
            'BOLD',
            'ITALIC',
            'STRIKETHROUGH',
            'SUMMARY_DELIMITER',
            'LINK',
            'IMAGE',
            'BLOCKQUOTE',
            'UNORDERED_LIST',
            'ORDERED_LIST',
            'EDITOR',
            'PREVIEW',
            'FULLSCREEN',
            'MODULAR',
            'NON_MODULAR',
            'VISIBLE',
            'NON_VISIBLE',
            'ROUTABLE',
            'NON_ROUTABLE',
            'PUBLISHED',
            'NON_PUBLISHED',
            'PLUGINS',
            'THEMES',
            'ALL',
            'FROM',
            'TO',
            'DROPZONE_CANCEL_UPLOAD',
            'DROPZONE_CANCEL_UPLOAD_CONFIRMATION',
            'DROPZONE_DEFAULT_MESSAGE',
            'DROPZONE_FALLBACK_MESSAGE',
            'DROPZONE_FALLBACK_TEXT',
            'DROPZONE_FILE_TOO_BIG',
            'DROPZONE_INVALID_FILE_TYPE',
            'DROPZONE_MAX_FILES_EXCEEDED',
            'DROPZONE_REMOVE_FILE',
            'DROPZONE_RESPONSE_ERROR'
        ];

        foreach ($strings as $string) {
            $separator = (end($strings) === $string) ? '' : ',';
            $translations .= '"' . $string . '": "' . $this->admin->translate('PLUGIN_ADMIN.' . $string) . '"' . $separator;
        }

        $translations .= '};';
        // set the actual translations state back
        $this->config->set('system.languages.translations', $translations_actual_state);

        $assets->addInlineJs($translations);
    }

    /**
     * Add the Admin Twig Extensions
     */
    public function onTwigExtensions()
    {
        require_once(__DIR__ . '/twig/AdminTwigExtension.php');
        $this->grav['twig']->twig->addExtension(new AdminTwigExtension());
    }

    /**
     * Check if the current route is under the admin path
     *
     * @return bool
     */
    public function isAdminPath()
    {
        if ($this->uri->route() == $this->base || substr($this->uri->route(), 0,
                strlen($this->base) + 1) == $this->base . '/'
        ) {
            return true;
        }

        return false;
    }

    public function onAdminDashboard()
    {
        $this->grav['twig']->plugins_hooked_dashboard_widgets_top[] = ['template' => 'dashboard-maintenance'];
        $this->grav['twig']->plugins_hooked_dashboard_widgets_top[] = ['template' => 'dashboard-statistics'];
        $this->grav['twig']->plugins_hooked_dashboard_widgets_top[] = ['template' => 'dashboard-notifications'];
        $this->grav['twig']->plugins_hooked_dashboard_widgets_top[] = ['template' => 'dashboard-feed'];
        $this->grav['twig']->plugins_hooked_dashboard_widgets_main[] = ['template' => 'dashboard-pages'];
    }

    public function onOutputGenerated()
    {
        // Clear flash objects for previously uploaded files
        // whenever the user switches page / reloads
        // ignoring any JSON / extension call
        if (is_null($this->uri->extension()) && $this->admin->task !== 'save') {
            // Discard any previously uploaded files session.
            // and if there were any uploaded file, remove them from the filesystem
            if ($flash = $this->session->getFlashObject('files-upload')) {
                $flash = new \RecursiveIteratorIterator(new \RecursiveArrayIterator($flash));
                foreach ($flash as $key => $value) {
                    if ($key !== 'tmp_name') {
                        continue;
                    }
                    @unlink($value);
                }
            }
        }
    }

    /**
     * Initial stab at registering permissions (WIP)
     *
     * @param Event $e
     */
    public function onAdminRegisterPermissions(Event $e)
    {
        $admin = $e['admin'];
        $permissions = [
            'admin.super'         => 'boolean',
            'admin.login'         => 'boolean',
            'admin.cache'         => 'boolean',
            'admin.configuration' => 'boolean',
            'admin.settings'      => 'boolean',
            'admin.pages'         => 'boolean',
            'admin.maintenance'   => 'boolean',
            'admin.statistics'    => 'boolean',
            'admin.plugins'       => 'boolean',
            'admin.themes'        => 'boolean',
            'admin.users'         => 'boolean',
        ];
        $admin->addPermissions($permissions);
    }

}