<?php
/**
 * License functions
 *
 * @link       https://raiolanetworks.es
 * @since      1.0.0
 *
 * @package    Wp_Database_Tools
 * @subpackage Wp_Database_Tools/includes
 */

/**
 * Contains the functionalities related to licence.
 *
 * This class defines all features of the current license.
 *
 * @since      1.0.0
 * @package    Wp_Database_Tools
 * @subpackage Wp_Database_Tools/includes
 * @author     Raiola Networks <info@raiolanetworks.es>
 */
class Wp_Database_Tools_License {


	/**
	 * The status returned by the EDD api
	 *
	 * @since    1.0.0
	 * @access   protected
	 * @var      array    $string    Content the status license valid|invalid.
	 */
	protected $status;

	/**
	 * The characteristics returned by an endpoint generated in the
	 * main installation that returns the values ​​of an ACF
	 *
	 * @since    1.0.0
	 * @access   protected
	 * @var      array    $features    Contains plugin features.
	 */
	protected $features;

	/**
	 * Collect the plugin prices returned by the EDD API
	 *
	 * @since    1.0.0
	 * @access   protected
	 * @var      array    $price    Content plugin prices.
	 */
	protected $price;

	/**
	 * The boolean if the license is active.
	 *
	 * @since    1.0.0
	 * @access   protected
	 * @var      boolean    $is_active    license active.
	 */
	protected $is_active;

	/**
	 * The unique identifier of this plugin.
	 *
	 * @since    1.0.0
	 * @access   protected
	 * @var      string    $plugin_name    The string used to uniquely identify this plugin.
	 */
	protected $plugin_name;

	/**
	 * The license key that is stored encrypted in the database
	 *
	 * @since    1.0.0
	 * @access   protected
	 * @var      string    $license_key    The string of key license.
	 */
	protected $license_key;

	/**
	 * The url license plugin.
	 *
	 * @since    1.0.0
	 * @access   protected
	 * @var      string    $license_url    The string of key license.
	 */
	protected $license_url;

	public function __construct( $plugin_name ) {
		$this->plugin_name = $plugin_name;
		$this->license_url = home_url();
		$this->init_license();
	}

	private function init_license() {
		$this->check_status();
		$this->check_price();
		$this->check_features();
	}

	/**
	 * Check current license status.
	 *
	 * @since     1.0.0
	 */
	private function check_status() {

		$this->status = get_option( WPDBT_PREFIX . 'edd_license_status' );

		if ( $this->status !== false ) {

			$license = get_option( WPDBT_PREFIX . 'edd_license_key' );

			if ( $license !== false && $license !== '' ) {
				$this->license_key = $this->decrypt( $license );
			}
		}

		$this->is_active = ( $this->status == 'valid' );

	}

	/**
	 * Getting prices using the EDD API.
	 *
	 * @since     1.0.0
	 */
	private function check_price() {

		$TRANSIENT_PRICES_PRO_KEY = WPDBT_PREFIX . 'prices_pro';

		if ( get_transient( $TRANSIENT_PRICES_PRO_KEY ) ) {
			$this->price = get_transient( $TRANSIENT_PRICES_PRO_KEY );
			return;
		}

		$response = wp_remote_get( WPDBT_EDD_STORE_URL . '/edd-api/v2/products/?product=140' );

		if ( is_wp_error( $response ) ) {
			return;
		}

		if ( ! $response['body'] ) {
			return;
		}

		$response = json_decode( $response['body'] );

		if ( ! $response ) {
			return;
		}

		if ( ! $response->products[0]->pricing ) {
			return;
		}

		set_transient( $TRANSIENT_PRICES_PRO_KEY, $response->products[0]->pricing, 86400 );

		$this->price = $response->products[0]->pricing;
	}

	/**
	 * Getting features from a custom enpoint using the WordPress rest API.
	 *
	 * @since     1.0.0
	 */
	private function check_features() {

		$TRANSIENT_FEATURES_PRO_KEY = WPDBT_PREFIX . 'features_pro';

		if ( get_transient( $TRANSIENT_FEATURES_PRO_KEY ) ) {
			$this->features = get_transient( $TRANSIENT_FEATURES_PRO_KEY );
			return;
		}

		$response = wp_remote_get( WPDBT_EDD_STORE_URL . '/wp-json/downloads/v1/acf/140' );

		if ( is_wp_error( $response ) ) {
			return;
		}

		$response = json_decode( $response['body'] );

		if ( ! $response->success ) {
			return;
		}

		set_transient( $TRANSIENT_FEATURES_PRO_KEY, $response->data, 86400 );
		$this->features = $response->data;

	}

	private function encrypt( $data ) {

		$key            = WPDBT_ENCRYPTION_KEY;
		$plaintext      = $data;
		$ivlen          = openssl_cipher_iv_length( $cipher = WPDBT_ENCRYPTION_METHOD );
		$iv             = openssl_random_pseudo_bytes( $ivlen );
		$ciphertext_raw = openssl_encrypt( $plaintext, $cipher, $key, $options = OPENSSL_RAW_DATA, $iv );
		$hmac           = hash_hmac( 'sha256', $ciphertext_raw, $key, $as_binary = true );
		$ciphertext     = base64_encode( $iv . $hmac . $ciphertext_raw );
		return $ciphertext;
	}

	private function decrypt( $data ) {

		$key                = WPDBT_ENCRYPTION_KEY;
		$c                  = base64_decode( $data );
		$ivlen              = openssl_cipher_iv_length( $cipher = WPDBT_ENCRYPTION_METHOD );
		$iv                 = substr( $c, 0, $ivlen );
		$hmac               = substr( $c, $ivlen, $sha2len = 32 );
		$ciphertext_raw     = substr( $c, $ivlen + $sha2len );
		$original_plaintext = openssl_decrypt( $ciphertext_raw, $cipher, $key, $options = OPENSSL_RAW_DATA, $iv );
		$calcmac            = hash_hmac( 'sha256', $ciphertext_raw, $key, $as_binary = true );
		if ( hash_equals( $hmac, $calcmac ) ) {
			return $original_plaintext;
		}

	}

	public function form_action_license() {

		$retrieved_nonce = $_REQUEST['edd_sample_nonce'];

		if ( ! wp_verify_nonce( $retrieved_nonce, 'active_plugin' ) ) {

			if ( ! check_admin_referer( 'edd_sample_nonce', 'edd_sample_nonce' ) ) {
				return;
			}

			$license = sanitize_text_field( $_POST['license'] );
			// data to send in our API request
			$api_params = array(
				'edd_action' => 'activate_license',
				'license'    => $license,
				'item_name'  => urlencode( WPDBT_EDD_ITEM_NAME ), // the name of our product in EDD
				'url'        => home_url(),
			);

			$response = wp_remote_post(
				WPDBT_EDD_STORE_URL,
				array(
					'timeout'   => 15,
					'sslverify' => false,
					'body'      => $api_params,
				)
			);

			if ( is_wp_error( $response ) || 200 !== wp_remote_retrieve_response_code( $response ) ) {

				$message = ( is_wp_error( $response ) && ! empty( $response->get_error_message() ) ) ? $response->get_error_message() : __( 'An error occurred, please try again.' );

			} else {

				$license_data = json_decode( wp_remote_retrieve_body( $response ) );

				if ( false === $license_data->success ) {

					switch ( $license_data->error ) {

						case 'expired':
							$message = sprintf(
								__( 'Your license key expired on %s.', WPDBT_SLUG ),
								date_i18n( get_option( 'date_format' ), strtotime( $license_data->expires, current_time( 'timestamp' ) ) )
							);
							break;

						case 'revoked':
							$message = __( 'Your license key has been disabled', WPDBT_SLUG );
							break;

						case 'missing':
							$message = __( 'Invalid license', WPDBT_SLUG );
							break;

						case 'invalid':
						case 'site_inactive':
							$message = __( 'Your license is not active for this URL', WPDBT_SLUG );
							break;

						case 'item_name_mismatch':
							$message = sprintf( __( 'This appears to be an invalid license key for %s.' ), WPDBT_SLUG );
							break;

						case 'no_activations_left':
							$message = __( 'Your license key has reached its activation limit', WPDBT_SLUG );
							break;

						default:
							$message = __( 'An error occurred, please try again', WPDBT_SLUG );
							break;
					}
				}

				if ( ! empty( $message ) ) {
					$base_url = admin_url( 'admin.php?page=license' );
					$redirect = add_query_arg(
						array(
							WPDBT_PREFIX . 'sl_activation' => 'false',
							'message'                      => urlencode( $message ),
						),
						$base_url
					);
					wp_redirect( $redirect );
					exit();
				}

				// SAVE OPTION
				$base_url = admin_url( 'admin.php?page=license' );
				update_option( WPDBT_PREFIX . 'edd_license_status', $license_data->license );
				update_option( WPDBT_PREFIX . 'edd_license_key', $this->encrypt( $license ) );
				$redirect = add_query_arg(
					array(
						WPDBT_PREFIX . 'sl_activation' => 'true',
						'message'                      => urlencode( 'Licencia activada' ),
					),
					$base_url
				);
				wp_redirect( $redirect );
				exit();

			}
		} else {
			wp_die(
				__( 'Invalid nonce specified', $this->plugin_name ),
				__( 'Error', $this->plugin_name ),
				array(
					'response'  => 403,
					'back_link' => 'admin.php?page=' . $this->plugin_name,

				)
			);
		}
	}

	/**
	 * The array of current status license.
	 *
	 * @since     1.0.0
	 * @return    array    The array of current status license.
	 */
	public function get_status() {

		return $this->status;

	}

	/**
	 * The array of features pro license.
	 *
	 * @since     1.0.0
	 * @return    array    The array of features pro license.
	 */
	public function get_features() {

		return $this->features;

	}

	/**
	 * The string of of current price pro license.
	 *
	 * @since     1.0.0
	 * @return    string    The string of current price pro license.
	 */
	public function get_price() {

		return $this->price;

	}

	/**
	 * The boolean of current current license.
	 *
	 * @since     1.0.0
	 * @return    boolean    The boolean current license status.
	 */
	public function get_is_active() {

		return $this->is_active;

	}

	/**
	 * The string of of current price pro license.
	 *
	 * @since     1.0.0
	 * @return    string    The string of current price pro license.
	 */
	public function get_license_key() {

		return $this->license_key;

	}

	/**
	 * Return the license key encrypt.
	 *
	 * @since     1.0.0
	 * @return    string    The license key encrypt.
	 */
	public function get_license_key_encrypt() {

		return get_option( WPDBT_PREFIX . 'edd_license_key' );

	}

	/**
	 * The string of of current price pro license.
	 *
	 * @since     1.0.0
	 * @return    string    The string of current price pro license.
	 */
	public function get_license_url() {

		return $this->license_url;

	}

	/**
	 * Set the license key value.
	 *
	 * @param string $value  license key value.
	 * @since     1.0.0
	 */
	public function set_license_key( $value ) {

		update_option( WPDBT_PREFIX . 'edd_license_status', $value );
		$this->license_key = $value;

	}

}