<?php

if ( ! defined( 'ABSPATH' ) || ! class_exists( 'NF_Abstracts_Action' ) ) {
	exit;
}

/**
 * Class NF_Actions_Recaptcha
 */
final class NF_Actions_Recaptcha extends NF_Abstracts_Action {

	/**
	 * @var string
	 */
	protected $_name = 'recaptcha';

	/**
	 * @var array
	 */
	protected $_tags = array( 'spam', 'filtering', 'recaptcha' );

	/**
	 * @var string
	 */
	protected $_timing = 'normal';

	/**
	 * @var int
	 */
	protected $_priority = '10';

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

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

	/**
	 * @var int
	 */
	protected $form_id;

	/**
	 * @var array
	 */
	protected $forms_with_action;

	/**
	 * @var array
	 */
	protected $_settings_exclude = array( 'conditions' );

	/**
	 * Constructor
	 */
	public function __construct() {
		parent::__construct();

		$this->_nicename = esc_html__( 'reCAPTCHA v3', 'ninja-forms' );
		$settings        = Ninja_Forms::config( 'ActionRecaptchaV3Settings' );
		$this->_settings = array_merge( $this->_settings, $settings );

		$this->site_key    = Ninja_Forms()->get_setting( 'recaptcha_site_key_3' );
		$this->site_secret = Ninja_Forms()->get_setting( 'recaptcha_secret_key_3' );

		add_filter( 'ninja_forms_action_type_settings', array( $this, 'maybe_remove_action' ) );

		add_action( 'nf_get_form_id', array( $this, 'set_form_id' ), 15, 1 );

		add_filter( 'ninja_forms_display_fields', array( $this, 'maybe_inject_field'), 10, 2 );
		add_filter( 'ninja_forms_form_fields', array( $this, 'maybe_remove_v2_field') );
		add_filter( 'ninja_forms_field_show_in_builder', array( $this, 'maybe_remove_v2_field_from_builder'), 10, 2 );
		add_action( 'ninja_forms_output_templates', array( $this, 'maybe_output_field_template') );
		add_filter( 'nf_display_enqueue_scripts', array( $this, 'enqueue_script' ) );
	}

	/**
	 * Setter method for the form_id and callback for the nf_get_form_id action.
	 * @since 3.2.2
	 *
	 * @param string $form_id The ID of the current form.
	 * @return void
	 */
	public function set_form_id( $form_id )
	{
		$this->form_id = $form_id;
	}

	public function get_form_id() {
		if ( $this->form_id ) {
			return $this->form_id;
		}

		$this->form_id = filter_input( INPUT_GET, 'form_id', FILTER_VALIDATE_INT );

		return $this->form_id;
	}

	/**
	 * Remove the action registration if Akismet functions not available.
	 *
	 * @param array $action_type_settings
	 *
	 * @return array
	 */
	public function maybe_remove_action( $action_type_settings ) {
		if ( ! $this->is_recaptcha_configured() ) {
			unset( $action_type_settings[ $this->_name ] );
		}

		return $action_type_settings;
	}

	/**
	 * @return bool
	 */
	protected function is_action_enabled_for_form() {
		$form_id = $this->get_form_id();

		if ( isset( $this->forms_with_action[ $form_id ] ) ) {
			return $this->forms_with_action[ $form_id ];
		}

		$actions = Ninja_Forms()->form( $form_id )->get_actions();

		$enabled = false;
		foreach ( $actions as $action ) {
			if ( $this->_name == $action->get_settings('type') && 1 == $action->get_setting( 'active' ) ) {
				$enabled = true;
				break;
			}
		}

		$this->forms_with_action[ $form_id ] = $enabled;

		return $enabled;
	}

	/**
	 * Is the reCAPTCHA configured correctly
	 *
	 * @return bool
	 */
	protected function is_recaptcha_configured() {
		if ( empty( $this->site_key ) || empty( $this->site_secret) ) {
			return false;
		}

		return true;
	}

	/**
	 * Is the reCAPTCHA action enabled
	 *
	 * @return bool
	 */
	protected function is_action_configured() {
		if ( ! $this->is_recaptcha_configured() ) {
			return false;
		}

		if ( ! $this->is_action_enabled_for_form() ) {
			return false;
		}

		return true;
	}

	public function maybe_output_field_template() {
		if ( ! $this->is_action_configured() ) {
			return;
		}

		$file_path = Ninja_Forms::$dir . 'includes/Templates/';

		echo file_get_contents( $file_path . "fields-recaptcha-v3.html" );
	}

	protected function get_field_id_hash( $form_id ) {
		return substr( base_convert( md5( $form_id ), 16, 10 ), - 5 );
	}

	/**
	 * Remove v2 reCAPTCHA fields if still configured, when using the v3 Action
	 *
	 * @param array $fields
	 *
	 * @return array
	 */
	public function maybe_remove_v2_field( $fields ) {
		if ( ! $this->is_action_configured() ) {
			return $fields;
		}

		foreach ( $fields as $key => $field ) {
			if ( 'recaptcha' === $field->get_setting('type') ) {
				// Remove v2 reCAPTCHA fields if still configured
				unset( $fields[ $key ] );
			}
		}

		return $fields;
	}

	/**
	 * Don't show the v2 reCAPTCHA field in the builder when using the v3 Action
	 *
	 * @param bool               $show
	 * @param NF_Abstracts_Field $field
	 *
	 * @return bool
	 */
	public function maybe_remove_v2_field_from_builder( $show, $field ) {
		if ( ! $this->is_action_configured() ) {
			return $show;
		}

		if ( 'recaptcha' !== $field->get_type() ) {
			return $show;
		}

		$saved_fields = Ninja_Forms()->form( $this->get_form_id() )->get_fields( array( 'saved' => 1 ), true );

		foreach ( $saved_fields as $key => $field ) {
			if ( 'recaptcha' === $field->get_setting( 'type' ) ) {
				// recaptcha v2 field exists on form, don't hide it as it will break the JS
				return $show;
			}
		}

		// Hide the recaptcha v2 field
		return false;
	}

	/**
	 * @param array $fields
	 * @param int $form_id
	 *
	 * @return array
	 */
	public function maybe_inject_field( $fields, $form_id ) {
		if ( ! $this->is_action_configured() ) {
			return $fields;
		}

		$field_id = $this->get_field_id_hash( $form_id );

		$field = array(
			'objectType'        => 'Field',
			'objectDomain'      => 'fields',
			'editActive'        => false,
			'order'             => number_format( count( $fields ) + 1, 1 ),
			'type'              => 'recaptcha_v3',
			'label'             => 'Hidden',
			'key'               => 'recaptcha_v3',
			'default'           => '',
			'admin_label'       => '',
			'drawerDisabled'    => false,
			'id'                => $field_id,
			'beforeField'       => '',
			'afterField'        => '',
			'value'             => '',
			'label_pos'         => 'above',
			'parentType'        => 'hidden',
			'element_templates' => array(
				'recaptcha-v3',
				'hidden',
				'input',
			),
			'old_classname'     => '',
			'wrap_template'     => 'wrap-no-label',
			'site_key'          => $this->site_key,
		);

		$fields[] = $field;

		return $fields;
	}

	public function enqueue_script() {
		if ( ! $this->is_action_configured() ) {
			return;
		}

		$recaptcha_lang = Ninja_Forms()->get_setting( 'recaptcha_lang', 'en' );

		if ( $this->maybe_enqueue_recaptcha_js() ) {
			wp_enqueue_script( 'nf-google-recaptcha', 'https://www.google.com/recaptcha/api.js?hl=' . $recaptcha_lang . '&render=' . $this->site_key, array( 'jquery' ), '3.0', true );
		}
	}

	/**
	 * Check to not load the Google reCAPTCHA JS if other plugins are doing it
	 * 
	 * @return bool
	 */
	protected function maybe_enqueue_recaptcha_js() {
		if ( false !== apply_filters( 'ninja_forms_pre_enqueue_recaptcha_v3_js', false ) ) {
			// Allow other plugins to tell Ninja Forms not to load the Google JS script, if they are doing that
			return false;
		}

		$scripts = wp_scripts();

		foreach( $scripts->registered as $script ) {
			if ( false !== strpos( $script->src, 'google.com/recaptcha/api.js' ) ) {
				return false;
			}
		}

		return true;
	}

	protected function get_form_data() {
		if ( empty( $_POST['formData'] ) ) {
			return false;
		}

		$form_data = json_decode( $_POST['formData'], true );

		// php5.2 fallback
		if ( ! $form_data ) {
			$form_data = json_decode( stripslashes( $_POST['formData'] ), true );
		}

		return $form_data ? $form_data : false;
	}

	protected function get_recaptcha_response() {
		$form_data = $this->get_form_data();

		if ( ! $form_data || ! isset( $form_data['id'] ) ) {
			return false;
		}

		$field_id = $this->get_field_id_hash( $form_data['id'] );

		if ( ! isset( $form_data['fields'] ) || ! isset( $form_data['fields'][ $field_id ] ) ) {
			return false;
		}

		return $form_data['fields'][ $field_id ]['value'];
	}

	/**
	 * Process the action
	 *
	 * @param array $action_settings
	 * @param int   $form_id
	 * @param array $data
	 *
	 * @return array
	 */
	public function process( $action_settings, $form_id, $data ) {
		if ( ! $this->is_recaptcha_configured() ) {
			return $data;
		}

		$recaptcha_response = $this->get_recaptcha_response();

		if ( ! $recaptcha_response) {
			$data['errors']['form']['recaptcha'] = esc_html__( 'Recaptcha validation failed. Please try again later', 'ninja-forms' );

			return $data;
		}

		if ( $this->is_submission_human( $recaptcha_response, $action_settings['score'] ) ) {
			return $data;
		}

		$data['errors']['form']['recaptcha'] = esc_html__( 'Recaptcha validation failed. Please try again later', 'ninja-forms' );

		return $data;
	}

	protected function is_submission_human( $token, $score_threshold ) {
		$endpoint = 'https://www.google.com/recaptcha/api/siteverify';

		$request = array(
			'body' => array(
				'secret'   => $this->site_secret,
				'response' => esc_html( $token ),
			),
		);

		$response = wp_remote_post( esc_url_raw( $endpoint ), $request );

		if ( 200 != wp_remote_retrieve_response_code( $response ) ) {
			if ( WP_DEBUG ) {
				error_log( print_r( $response, true ) );
			}

			return false;
		}

		$response_body = wp_remote_retrieve_body( $response );
		$response_body = json_decode( $response_body, true );

		$score = isset( $response_body['score'] ) ? $response_body['score'] : 0;

		$threshold = apply_filters( 'ninja_forms_action_recaptcha_score_threshold', $score_threshold );
		$is_human  = $threshold < $score;

		$is_human = apply_filters( 'ninja_forms_action_recaptcha__verify_response', $is_human, $response_body );

		return $is_human;
	}
}