ecomail-newsletter.php

<?php
/*
		Plugin Name: Ecomail Newsletter
		Plugin URI:  https://github.com/adam-laita/ecomail-newsletter/
		Description: Ecomail Newsletter plugin.
		Version:     1.0.0
		Author:      Daniel Koch, Adam Laita
		Author URI:  https://github.com/adam-laita/ecomail-newsletter/
		License:     GPL3
		License URI: https://www.gnu.org/licenses/gpl-3.0.html
		Text Domain: klen
		Domain Path: /languages
*/

if ( ! defined( 'ABSPATH' ) ) {
	exit; // Exit if accessed directly.
}

// Path, directory & basename
define( 'KLEN_PATH_DIR', plugin_dir_path( __FILE__ ) );
define( 'KLEN_PATH_URL', plugin_dir_url( __FILE__ ) );
define( 'KLEN_BASENAME', plugin_basename( __FILE__ ) );

class KLEN_Ecomail {
	/**
	 * Plugin meta
	 *
	 * @var string
	 */
	public $plugin_meta;

	/**
	 *
	 */
	public function __construct() {
		$this->actions();
		$this->includePluginFiles();
		$this->registerSettingsFields();
	}

	/**
	 * List all actions of the plugin
	 *
	 * @return void
	 */
	private function actions() {
		add_action( 'wp_enqueue_scripts', array( $this, 'registerFrontendScripts' ) );
		add_action( 'admin_enqueue_scripts', array( $this, 'registerAdminScripts' ) );
		add_action( 'admin_menu', array( $this, 'createAdminPage' ) );
		add_action( 'admin_init', array( $this, 'languageTextdomain' ) );
		add_filter( 'plugin_action_links', array( $this, 'addSettingsLink' ), 10, 2 );

	}

	/**
	 * Adds textdomain for translations.
	 *
	 * @return void
	 */
	public function languageTextdomain() {
		load_plugin_textdomain( 'klen', false, dirname( KLEN_BASENAME ) . '/languages' );
	}

	/**
	 * @return void
	 */
	private function includePluginFiles() {
		require_once KLEN_PATH_DIR . '/admin/settings/labels.php';
		require_once KLEN_PATH_DIR . '/admin/settings/appearance.php';
		require_once KLEN_PATH_DIR . '/admin/settings/main.php';
		require_once KLEN_PATH_DIR . '/includes/request.php';
		require_once KLEN_PATH_DIR . '/includes/shortcode.php';
		require_once KLEN_PATH_DIR . '/includes/translations.php';
	}

	/**
	 * Register all frontend scripts used in plugin
	 *
	 * @return void
	 */
	public function registerFrontendScripts() {

		if ( ! function_exists( 'get_plugin_data' ) ) {
			require_once( ABSPATH . 'wp-admin/includes/plugin.php' );
		}

		$plugin_meta = get_plugin_data( __FILE__ );

		// Styles for Ecomail form
		wp_register_style( 'klen_form', KLEN_PATH_URL . '/assets/css/klen-form.css', null, $plugin_meta['Version'], 'all' );

		// Scripts for Ecomail form
		wp_register_script( 'klen_form', KLEN_PATH_URL . '/assets/js/klen-form.js', null, $plugin_meta['Version'], true );
	}

	/**
	 * Register all admin scripts used in plugin
	 *
	 * @return void
	 */
	public function registerAdminScripts() {
		$plugin_meta = get_plugin_data( __FILE__ );

		$style = get_option( 'klen_appearance_style' );

		if ( empty( $style ) || $style == 'default' ) {
			// Styles for Ecomail form
			wp_enqueue_style( 'klen_form', KLEN_PATH_URL . '/assets/css/klen-form.css', null, $plugin_meta['Version'], 'all' );
		}

		$current_admin_page = get_current_screen();

		if ( $current_admin_page->base == 'settings_page_klen_admin_page' ) {
			// Styles for admin
			wp_enqueue_style( 'klen_admin', KLEN_PATH_URL . '/assets/css/klen-admin.css', null, $plugin_meta['Version'], 'all' );
		}

		// Scripts for Ecomail form
		wp_enqueue_script( 'klen_form', KLEN_PATH_URL . '/assets/js/klen-form.js', null, $plugin_meta['Version'], true );
	}

	/**
	 * Create admin menu page
	 *
	 * @return void
	 */
	public function createAdminPage() {
		add_submenu_page(
			'options-general.php',
			__( 'Ecomail Newsletter', 'klen' ),
			__( 'Ecomail Newsletter', 'klen' ),
			'manage_options',
			'klen_admin_page',
			array( $this, 'adminPageTemplate' )
		);
	}

	/**
	 * Admin menu page labels callback
	 *
	 * @return void
	 */
	public function adminPageTemplate() {
		require_once KLEN_PATH_DIR . '/admin/settings/template.php';
	}

	public function registerSettingsFields() {

		// Register a new settings main tab
		register_setting( 'klen_main', 'klen_api_key' );
		register_setting( 'klen_main', 'klen_list_id' );
		register_setting( 'klen_main', 'klen_subscribers_count' );

		// Register a new settings labels tab
		register_setting( 'klen_labels', 'klen_labels_title' );
		register_setting( 'klen_labels', 'klen_labels_desc' );
		register_setting( 'klen_labels', 'klen_labels_label' );
		register_setting( 'klen_labels', 'klen_labels_placeholder' );
		register_setting( 'klen_labels', 'klen_labels_checkbox' );
		register_setting( 'klen_labels', 'klen_labels_button' );
		register_setting( 'klen_labels', 'klen_labels_success' );
		register_setting( 'klen_labels', 'klen_labels_error' );
		register_setting( 'klen_labels', 'klen_labels_warning' );

		// Register a new settings appearance tab
		register_setting( 'klen_appearance', 'klen_appearance_style' );
	}

	/**
	 * Add a settings link to the plugin listing page.
	 *
	 * @param array $actions Plugin action links.
	 * @param string $plugin_file Plugin file path.
	 *
	 * @return array Modified plugin action links.
	 */
	public function addSettingsLink( $actions, $plugin_file ) {
		// Add the settings link only for your plugin
		if ( plugin_basename( __FILE__ ) === $plugin_file ) {
			$settings_link = '<a href="' . esc_url( admin_url( 'options-general.php?page=klen_admin_page' ) ) . '">' . __( 'Settings', 'klen' ) . '</a>';
			array_push( $actions, $settings_link );
		}

		return $actions;
	}
}

new KLEN_Ecomail();