<?php
namespace Amoforms;

use Amoforms\Traits\Singleton;
use Amoforms\Exceptions\Validate;

defined('AMOFORMS_BOOTSTRAP') or die('Direct access denied');

/**
 * Class Router
 * @since 1.0.0
 * @method static $this instance
 * @package Amoforms
 */
class Router
{
	use Singleton;

	/** @var string */
	protected $_page = '';

	/** @var string */
	protected $_controller = '';

	/** @var string */
	protected $_action = '';

	/** @var bool */
	protected $_is_ajax = FALSE;

	/** @var string */
	protected $_ajax_prefix = 'amoforms_';

	protected $_menu_title = 'amoForms';
	protected $_menu_slug = 'amoforms';
	protected $_main_menu_slug = 'amoforms-settings';
	protected $_settings_capability = 'manage_options';

	/**
	 * Admin menu items in format: controller-action_name.
	 * The resulting values ​​will be as: $this->_menu_slug . '-' . 'settings-edit_form'
	 * Example: amoforms-settings-edit_form
	 * @var array
	 */
	protected $_admin_menu_items = [
		'Edit Fields'    => 'settings',
		'Form Settings'  => 'settings-edit_form',
		'Email Settings' => 'settings-edit_email',
		'Form Preview'   => 'settings-form_preview',
		'Account'        => 'settings-edit_account',
		'Entries'        => 'entries',
	];

	/**
	 * Ajax endpoints.
	 * The resulting values ​​will be as: $this->_ajax_prefix . 'add_field'
	 * Example: amoforms_add_field
	 * @var array
	 */
	protected $_ajax_actions = [
		'private' => [
			// Fields settings
			'Add field'                 => 'add_field',
			'Duplicate field'           => 'duplicate_field',
			'Delete field'              => 'delete_field',
			'Edit field'                => 'edit_field',
			'Update fields'             => 'update_fields',
			'Update submit button'      => 'update_submit_button',

			// Account settings
			'Check amo user is free'    => 'check_email',
			'Check amo acc credentials' => 'has_connection',
			'Check amo form settings'   => 'update_form',
			'Check amo email settings'  => 'update_email',

			// Other
			'Delete all forms'          => 'delete_all_forms',
		],
		'protected' => [
			'Submit amo form'           => 'submit',
		],
		'public' => [

		],
	];

	/**
	 * @since 1.0.0
	 */
	protected function __construct()
	{
		$this->_is_ajax = (!empty($_SERVER['HTTP_X_REQUESTED_WITH']) && strtoupper($_SERVER['HTTP_X_REQUESTED_WITH']) === 'XMLHTTPREQUEST');
		$this->_page = !empty($_GET['page']) ? (string)$_GET['page'] : '';
		$parts = explode('-', $this->_page);
		if (!empty($parts[1])) {
			$this->_controller = $parts[1];
		} elseif (isset($_GET['controller'])) {
			$this->_controller = $_GET['controller'];
		} else {
			$this->_controller = 'Settings';
		}

		$this->_action = !empty($_REQUEST['action']) ? $_REQUEST['action'] : (!empty($parts[2]) ? $parts[2] : 'index');

		if ($this->_is_ajax && strpos($this->_action, $this->_ajax_prefix) === 0) {
			$this->_action = str_replace($this->_ajax_prefix, '', $this->_action);
		}

		$this->init_admin_menu();
		$this->init_ajax_actions();
	}

	/**
	 * Check, whether the request is ajax
	 * @since 2.5.0
	 * @return bool
	 */
	public function is_ajax() {
		return $this->_is_ajax;
	}

	/**
	 * Get admin menu items with their full actions
	 * @since 2.8.0
	 * @return array
	 */
	public function get_admin_menu_items()
	{
		$result = [];
		foreach ($this->_admin_menu_items as $name => $action) {
			$result[$name] = $this->_menu_slug . ($action ? '-' . $action : '');
		}
		return $result;
	}

	/**
	 * Init admin menu
	 * @since 1.0.0
	 */
	protected function init_admin_menu()
	{
		//TODO: check capabilities in controller
		add_action('admin_menu', function () {
			add_menu_page($this->_menu_title, $this->_menu_title, $this->_settings_capability, $this->_main_menu_slug, [$this, 'navigate']);
			foreach ($this->get_admin_menu_items() as $title => $action) {
				add_submenu_page($this->_main_menu_slug, $title, $title, $this->_settings_capability, $action, [$this, 'navigate']);
			}
		});
	}

	/**
	 * Init ajax actions
	 * @since 2.0.1
	 */
	protected function init_ajax_actions()
	{
		foreach($this->_ajax_actions as $type => $actions) {
			foreach ($actions as $action) {
				$action = $this->_ajax_prefix . $action;
				switch($type) {
					case 'private':
						add_action("wp_ajax_{$action}", [$this, 'navigate_ajax']);
						break;
					case 'protected':
						add_action("wp_ajax_{$action}", [$this, 'navigate_ajax']);
						add_action("wp_ajax_nopriv_{$action}", [$this, 'navigate_ajax']);
						break;
					case 'public':
						add_action("wp_ajax_nopriv_{$action}", [$this, 'navigate_ajax']);
						break;
				}
			}
		}
	}

	/**
	 * Navigate to controller and action
	 * @since 1.0.0
	 * @throws Exceptions\Validate
	 */
	public function navigate()
	{
		try {
			$controller_name = '\\' . __NAMESPACE__ . '\\Controllers\\' . ucfirst($this->_controller);
			$action = $this->_action . '_action';

			if (!class_exists($controller_name)) {
				throw new Validate('Undefined controller');
			}

			$controller = new $controller_name();
			if (!method_exists($controller, $action)) {
				throw new Validate('Undefined action');
			}

			$controller->$action();

		} catch (\Exception $e) {
			Helpers::handle_exception($e);
		}
	}

	/**
	 * Navigate for ajax requests
	 * @since 2.0.0
	 */
	public function navigate_ajax() {
		header('Cache-Control: no-cache, must-revalidate');
		header('Expires: Mon, 26 Jul 1997 05:00:00 GMT');
		header('Content-type: application/json');

		$this->navigate();
		die;
	}
}