<?php
/**
 * Setup the administrative menu and options page.
 *
 * @package   Gps_Tracker_Admin
 * @author    Nick Fox <nickfox@websmithing.com>
 * @license   MIT/GPLv2 or later
 * @link      https://www.websmithing.com/gps-tracker
 * @copyright 2014 Nick Fox
 */

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

/**
 * Gps_Tracker_Admin Class
 *
 * @since 1.0.0
 */
class Gps_Tracker_Admin {

	/**
	 * Instance of this class.
	 *
	 * @since    1.0.0
	 *
	 * @var      object
	 */
	protected static $instance = null;

	/**
	 * Slug of the plugin screen.
	 *
	 * @since    1.0.0
	 *
	 * @var      string
	 */
	protected $plugin_screen_hook_suffix = null;

	/**
	 * Initialize the plugin by loading admin scripts & styles and adding a
	 * settings page and menu.
	 *
	 * @since     1.0.0
	 */
	private function __construct() {
		/*
		 * Call $plugin_slug from public plugin class.
		 */
		$plugin = Gps_Tracker::get_instance();
		$this->plugin_slug = $plugin->get_plugin_slug();

		// Load admin style sheet.
		add_action( 'admin_enqueue_scripts', array( $this, 'enqueue_admin_styles' ) );

		// Add the options page and menu item.
		add_action( 'admin_menu', array( $this, 'add_plugin_admin_menu' ) );

        // Add an action link pointing to the options page.
        $plugin_basename = plugin_basename( plugin_dir_path( realpath( dirname( __FILE__ ) ) ) . $this->plugin_slug . '.php' );

        add_filter( 'plugin_action_links_' . $plugin_basename, array( $this, 'add_action_links' ) );
    }

	/**
	 * Return an instance of this class.
	 *
	 * @since     1.0.0
	 *
	 * @return    object    A single instance of this class.
	 */
	public static function get_instance() {

		// If the single instance hasn't been set, set it now.
		if ( null == self::$instance ) {
			self::$instance = new self;
		}

		return self::$instance;
	}

	/**
	 * Register and enqueue admin-specific style sheet.
	 *
	 * @since     1.0.0
	 *
	 * @return    null    Return early if no settings page is registered.
	 */
	public function enqueue_admin_styles() {

		if ( ! isset( $this->plugin_screen_hook_suffix ) ) {
			return;
		}

		$screen = get_current_screen();
		if ( $this->plugin_screen_hook_suffix == $screen->id ) {
			wp_enqueue_style( $this->plugin_slug .'-admin-styles', plugins_url( 'assets/css/admin.css', __FILE__ ), array(), Gps_Tracker::VERSION );
		}

	}

	/**
	 * Register the administration menu for this plugin into the WordPress Dashboard menu.
	 *
	 * @since    1.0.0
	 */
	public function add_plugin_admin_menu() {
		$this->plugin_screen_hook_suffix = add_menu_page(
			__( 'Gps Tracker', $this->plugin_slug ),
			__( 'Gps Tracker', $this->plugin_slug ),
			'manage_options',
			$this->plugin_slug,
			array( $this, 'display_plugin_admin_page' ),
            plugins_url('assets/images/satellite.png', __FILE__)
		);
	}
    
	/**
	 * Render the settings page for this plugin.
	 *
	 * @since    1.0.0
	 */
	public function display_plugin_admin_page() {
		include_once( 'views/admin.php' );
	}

	/**
	 * Add settings action link to the plugins page.
	 *
	 * @since    1.0.0
	 */
	public function add_action_links( $links ) {

		return array_merge(
			array(
				'settings' => '<a href="' . admin_url( 'admin.php?page=' . $this->plugin_slug ) . '">' . __( 'Settings', $this->plugin_slug ) . '</a>'
			),
			$links
		);
	}
}