<?php

/**
* Class MC4WP_Admin
*
* @ignore
* @access private
*/
class MC4WP_Admin
{
    /**
    * @var string The relative path to the main plugin file from the plugins dir
    */
    protected $plugin_file;

    /**
    * @var MC4WP_Admin_Messages
    */
    protected $messages;

    /**
    * @var MC4WP_Admin_Ads
    */
    protected $ads;

    /**
    * @var MC4WP_Admin_Tools
    */
    protected $tools;

    /**
    * @var MC4WP_Admin_Review_Notice
    */
    protected $review_notice;

    /**
    * Constructor
    *
    * @param MC4WP_Admin_Tools $tools
    * @param MC4WP_Admin_Messages $messages
    */
    public function __construct(MC4WP_Admin_Tools $tools, MC4WP_Admin_Messages $messages)
    {
        $this->tools         = $tools;
        $this->messages      = $messages;
        $this->plugin_file   = plugin_basename(MC4WP_PLUGIN_FILE);
        $this->ads           = new MC4WP_Admin_Ads();
        $this->review_notice = new MC4WP_Admin_Review_Notice($tools);
    }

    /**
    * Registers all hooks
    */
    public function add_hooks()
    {

        // Actions used globally throughout WP Admin
        add_action('admin_menu', array( $this, 'build_menu' ));
        add_action('admin_init', array( $this, 'initialize' ));

        add_action('current_screen', array( $this, 'customize_admin_texts' ));
        add_action('wp_dashboard_setup', array( $this, 'register_dashboard_widgets' ));
        add_action('mc4wp_admin_empty_lists_cache', array( $this, 'renew_lists_cache' ));
        add_action('mc4wp_admin_empty_debug_log', array( $this, 'empty_debug_log' ));

        add_action('admin_notices', array( $this, 'show_api_key_notice' ));
        add_action('mc4wp_admin_dismiss_api_key_notice', array( $this, 'dismiss_api_key_notice' ));
        add_action('admin_enqueue_scripts', array( $this, 'enqueue_assets' ));

        $this->ads->add_hooks();
        $this->messages->add_hooks();
        $this->review_notice->add_hooks();
    }

    /**
    * Initializes various stuff used in WP Admin
    *
    * - Registers settings
    */
    public function initialize()
    {

        // register settings
        register_setting('mc4wp_settings', 'mc4wp', array( $this, 'save_general_settings' ));

        // Load upgrader
        $this->init_upgrade_routines();

        // listen for custom actions
        $this->listen_for_actions();
    }


    /**
    * Listen for `_mc4wp_action` requests
    */
    public function listen_for_actions()
    {
        // do nothing if _mc4wp_action was not in the request parameters
        if (! isset($_REQUEST['_mc4wp_action'])) {
            return;
        }

        // check if user is authorized
        if (! $this->tools->is_user_authorized()) {
            return;
        }

        // verify nonce
        if (! isset($_REQUEST['_wpnonce']) || false === wp_verify_nonce($_REQUEST['_wpnonce'], '_mc4wp_action')) {
            wp_nonce_ays('_mc4wp_action');
            exit;
        }

        $action = (string) $_REQUEST['_mc4wp_action'];

        /**
        * Allows you to hook into requests containing `_mc4wp_action` => action name.
        *
        * The dynamic portion of the hook name, `$action`, refers to the action name.
        *
        * By the time this hook is fired, the user is already authorized. After processing all the registered hooks,
        * the request is redirected back to the referring URL.
        *
        * @since 3.0
        */
        do_action('mc4wp_admin_' . $action);

        // redirect back to where we came from (to prevent double submit)
        if (isset($_POST['_redirect_to'])) {
            $redirect_url = $_POST['_redirect_to'];
        } elseif (isset($_GET['_redirect_to'])) {
            $redirect_url = $_GET['_redirect_to'];
        } else {
            $redirect_url = remove_query_arg('_mc4wp_action');
        }

        wp_safe_redirect($redirect_url);
        exit;
    }

    /**
    * Register dashboard widgets
    */
    public function register_dashboard_widgets()
    {
        if (! $this->tools->is_user_authorized()) {
            return;
        }

        /**
        * Setup dashboard widget, users are authorized by now.
        *
        * Use this hook to register your own dashboard widgets for users with the required capability.
        *
        * @since 3.0
        * @ignore
        */
        do_action('mc4wp_dashboard_setup');
    }

    /**
    * Upgrade routine
    */
    private function init_upgrade_routines()
    {
        // upgrade routine for upgrade routine....
        $previous_version = get_option('mc4wp_lite_version', 0);
        if ($previous_version) {
            delete_option('mc4wp_lite_version');
            update_option('mc4wp_version', $previous_version);
        }

        $previous_version = get_option('mc4wp_version', 0);

        // Ran upgrade routines before?
        if (empty($previous_version)) {
            update_option('mc4wp_version', MC4WP_VERSION);

            // if we have at least one form, we're going to run upgrade routine for v3 => v4 anyway.
            $posts = get_posts(
                array(
                    'post_type'   => 'mc4wp-form',
                    'posts_per_page' => 1,
                )
            );
            if (empty($posts)) {
                return;
            }

            $previous_version = '3.9';
        }

        // This means we're good!
        if (version_compare($previous_version, MC4WP_VERSION, '>=')) {
            return;
        }

        define('MC4WP_DOING_UPGRADE', true);
        $upgrade_routines = new MC4WP_Upgrade_Routines($previous_version, MC4WP_VERSION, __DIR__ . '/migrations');
        $upgrade_routines->run();
        update_option('mc4wp_version', MC4WP_VERSION);
    }

    /**
    * Renew Mailchimp lists cache
    */
    public function renew_lists_cache()
    {
        // try getting new lists to fill cache again
        $mailchimp = new MC4WP_MailChimp();
        $lists     = $mailchimp->refresh_lists();

        if (! empty($lists)) {
            $this->messages->flash(esc_html__('Success! The cached configuration for your Mailchimp lists has been renewed.', 'mailchimp-for-wp'));
        }
    }

    /**
    * Customize texts throughout WP Admin
    */
    public function customize_admin_texts()
    {
        $texts = new MC4WP_Admin_Texts($this->plugin_file);
        $texts->add_hooks();
    }

    /**
    * Validates the General settings
    * @param array $settings
    * @return array
    */
    public function save_general_settings(array $settings)
    {
        $current = mc4wp_get_options();

        // merge with current settings to allow passing partial arrays to this method
        $settings = array_merge($current, $settings);

        // Make sure not to use obfuscated key
        if (strpos($settings['api_key'], '*') !== false) {
            $settings['api_key'] = $current['api_key'];
        }

        // Sanitize API key
        $settings['api_key'] = sanitize_text_field($settings['api_key']);

        // if API key changed, empty Mailchimp cache
        if ($settings['api_key'] !== $current['api_key']) {
            delete_transient('mc4wp_mailchimp_lists');
        }

        /**
        * Runs right before general settings are saved.
        *
        * @param array $settings The updated settings array
        * @param array $current The old settings array
        */
        do_action('mc4wp_save_settings', $settings, $current);

        return $settings;
    }

    /**
    * Load scripts and stylesheet on Mailchimp for WP Admin pages
    */
    public function enqueue_assets()
    {
        if (! $this->tools->on_plugin_page()) {
            return;
        }

        $opts      = mc4wp_get_options();
        $page      = $this->tools->get_plugin_page();
        $mailchimp = new MC4WP_MailChimp();

        // css
        wp_register_style('mc4wp-admin', mc4wp_plugin_url('assets/css/admin.css'), array(), MC4WP_VERSION);
        wp_enqueue_style('mc4wp-admin');

        // js
        wp_register_script('mc4wp-admin', mc4wp_plugin_url('assets/js/admin.js'), array(), MC4WP_VERSION, true);
        wp_enqueue_script('mc4wp-admin');
        $connected       = ! empty($opts['api_key']);
        $mailchimp_lists = $connected ? $mailchimp->get_lists() : array();
        wp_localize_script(
            'mc4wp-admin',
            'mc4wp_vars',
            array(
                'ajaxurl' => admin_url('admin-ajax.php'),
                'nonce' => wp_create_nonce('mc4wp-ajax'),
                'mailchimp' => array(
                    'api_connected' => $connected,
                    'lists'         => $mailchimp_lists,
                ),
                'countries' => MC4WP_Tools::get_countries(),
                'i18n'      => array(
                    'invalid_api_key'                => __('The given value does not look like a valid Mailchimp API key.', 'mailchimp-for-wp'),
                    'pro_only'                       => __('This is a premium feature. Please upgrade to Mailchimp for WordPress Premium to be able to use it.', 'mailchimp-for-wp'),
                    'renew_mailchimp_lists'          => __('Renew Mailchimp lists', 'mailchimp-for-wp'),
                    'fetching_mailchimp_lists'       => __('Fetching Mailchimp lists', 'mailchimp-for-wp'),
                    'fetching_mailchimp_lists_done'  => __('Done! Mailchimp lists renewed.', 'mailchimp-for-wp'),
                    'fetching_mailchimp_lists_error' => __('Failed to renew your lists. An error occured.', 'mailchimp-for-wp'),
                ),
            )
        );

        /**
        * Hook to enqueue your own custom assets on the Mailchimp for WordPress setting pages.
        *
        * @since 3.0
        *
        * @param string $suffix
        * @param string $page
        */
        do_action('mc4wp_admin_enqueue_assets', '', $page);
    }



    /**
    * Register the setting pages and their menu items
    */
    public function build_menu()
    {
        $required_cap = $this->tools->get_required_capability();

        $menu_items = array(
            array(
                'title'    => esc_html__('Mailchimp API Settings', 'mailchimp-for-wp'),
                'text'     => 'Mailchimp',
                'slug'     => '',
                'callback' => array( $this, 'show_generals_setting_page' ),
                'position' => 0,
            ),
            array(
                'title'    => esc_html__('Other Settings', 'mailchimp-for-wp'),
                'text'     => esc_html__('Other', 'mailchimp-for-wp'),
                'slug'     => 'other',
                'callback' => array( $this, 'show_other_setting_page' ),
                'position' => 90,
            ),

        );

        /**
        * Filters the menu items to appear under the main menu item.
        *
        * To add your own item, add an associative array in the following format.
        *
        * $menu_items[] = array(
        *     'title' => 'Page title',
        *     'text'  => 'Menu text',
        *     'slug' => 'Page slug',
        *     'callback' => 'my_page_function',
        *     'position' => 50
        * );
        *
        * @param array $menu_items
        * @since 3.0
        */
        $menu_items = (array) apply_filters('mc4wp_admin_menu_items', $menu_items);

        // add top menu item
        $icon = file_get_contents(MC4WP_PLUGIN_DIR . '/assets/img/icon.svg');
        add_menu_page('Mailchimp for WP', 'MC4WP', $required_cap, 'mailchimp-for-wp', array( $this, 'show_generals_setting_page' ), 'data:image/svg+xml;base64,' . base64_encode($icon), '99.68491');

        // sort submenu items by 'position'
        usort($menu_items, array( $this, 'sort_menu_items_by_position' ));

        // add sub-menu items
        foreach ($menu_items as $item) {
            $this->add_menu_item($item);
        }
    }

    /**
    * @param array $item
    */
    public function add_menu_item(array $item)
    {

        // generate menu slug
        $slug = 'mailchimp-for-wp';
        if (! empty($item['slug'])) {
            $slug .= '-' . $item['slug'];
        }

        // provide some defaults
        $parent_slug = ! empty($item['parent_slug']) ? $item['parent_slug'] : 'mailchimp-for-wp';
        $capability  = ! empty($item['capability']) ? $item['capability'] : $this->tools->get_required_capability();

        // register page
        $hook = add_submenu_page($parent_slug, $item['title'] . ' - Mailchimp for WordPress', $item['text'], $capability, $slug, $item['callback']);

        // register callback for loading this page, if given
        if (array_key_exists('load_callback', $item)) {
            add_action('load-' . $hook, $item['load_callback']);
        }
    }

    /**
    * Show the API Settings page
    */
    public function show_generals_setting_page()
    {
        $opts      = mc4wp_get_options();
        $api_key   = mc4wp_get_api_key();
        $lists     = array();
        $connected = ! empty($api_key);

        if ($connected) {
            try {
                $connected = $this->get_api()->is_connected();
                $mailchimp = new MC4WP_MailChimp();
                $lists     = $mailchimp->get_lists();
            } catch (MC4WP_API_Connection_Exception $e) {
                $message = sprintf('<strong>%s</strong> %s %s ', esc_html__('Error connecting to Mailchimp:', 'mailchimp-for-wp'), $e->getCode(), $e->getMessage());

                if (is_object($e->response_data) && ! empty($e->response_data->ref_no)) {
                    $message .= '<br />' . sprintf(esc_html__('Looks like your server is blocked by Mailchimp\'s firewall. Please contact Mailchimp support and include the following reference number: %s', 'mailchimp-for-wp'), $e->response_data->ref_no);
                }

                $message .= '<br /><br />' . sprintf('<a href="%s">' . esc_html__('Here\'s some info on solving common connectivity issues.', 'mailchimp-for-wp') . '</a>', 'https://www.mc4wp.com/kb/solving-connectivity-issues/#utm_source=wp-plugin&utm_medium=mailchimp-for-wp&utm_campaign=settings-notice');

                $this->messages->flash($message, 'error');
                $connected = false;
            } catch (MC4WP_API_Exception $e) {
                $message = sprintf('<strong>%s</strong><br /> %s', esc_html__('Mailchimp returned the following error:', 'mailchimp-for-wp'), nl2br((string) $e));
                $this->messages->flash($message, 'error');
                $connected = false;
            }
        }

        $obfuscated_api_key = mc4wp_obfuscate_string($api_key);
        require MC4WP_PLUGIN_DIR . '/includes/views/general-settings.php';
    }

    /**
    * Show the Other Settings page
    */
    public function show_other_setting_page()
    {
        $opts       = mc4wp_get_options();
        $log        = $this->get_log();
        $log_reader = new MC4WP_Debug_Log_Reader($log->file);
        require MC4WP_PLUGIN_DIR . '/includes/views/other-settings.php';
    }

    /**
    * @param $a
    * @param $b
    *
    * @return int
    */
    public function sort_menu_items_by_position($a, $b)
    {
        $pos_a = isset($a['position']) ? $a['position'] : 80;
        $pos_b = isset($b['position']) ? $b['position'] : 90;
        return $pos_a < $pos_b ? -1 : 1;
    }

    /**
    * Empties the log file
    */
    public function empty_debug_log()
    {
        $log = $this->get_log();
        file_put_contents($log->file, '');

        $this->messages->flash(esc_html__('Log successfully emptied.', 'mailchimp-for-wp'));
    }

    /**
    * Shows a notice when API key is not set.
    */
    public function show_api_key_notice()
    {

        // don't show if on settings page already
        if ($this->tools->on_plugin_page('')) {
            return;
        }

        // only show to user with proper permissions
        if (! $this->tools->is_user_authorized()) {
            return;
        }

        // don't show if dismissed
        if (get_transient('mc4wp_api_key_notice_dismissed')) {
            return;
        }

        // don't show if api key is set already
        $api_key = mc4wp_get_api_key();
        if (! empty($api_key)) {
            return;
        }

        echo '<div class="notice notice-warning mc4wp-is-dismissible">';
        echo '<p>', sprintf(wp_kses(__('To get started with Mailchimp for WordPress, please <a href="%s">enter your Mailchimp API key on the settings page of the plugin</a>.', 'mailchimp-for-wp'), array( 'a' => array( 'href' => array() ) )), admin_url('admin.php?page=mailchimp-for-wp')), '</p>';
        echo '<form method="post"><input type="hidden" name="_mc4wp_action" value="dismiss_api_key_notice" /><button type="submit" class="notice-dismiss"><span class="screen-reader-text">Dismiss this notice.</span></button></form>';
        echo '</div>';
    }

    /**
    * Dismisses the API key notice for 1 week
    */
    public function dismiss_api_key_notice()
    {
        set_transient('mc4wp_api_key_notice_dismissed', 1, 3600 * 24 * 7);
    }

    /**
    * @return MC4WP_Debug_Log
    */
    protected function get_log()
    {
        return mc4wp('log');
    }

    /**
    * @return MC4WP_API_V3
    */
    protected function get_api()
    {
        return mc4wp('api');
    }
}
