<?php
/**
 * Theme updater admin page and functions.
 *
 * @package EDD Sample Theme
 */

class EDD_Theme_Updater_Admin {

	/**
	 * Variables required for the theme updater
	 *
	 * @since 1.0.0
	 * @type string
	 */
	 protected $remote_api_url = null;
	 protected $theme_slug = null;
	 protected $version = null;
	 protected $author = null;
	 protected $download_id = null;
	 protected $renew_url = null;
	 protected $strings = null;

	/**
	 * Initialize the class.
	 *
	 * @since 1.0.0
	 */
	function __construct( $config = array(), $strings = array() ) {

		$config = wp_parse_args( $config, array(
			'remote_api_url' => 'http://easydigitaldownloads.com',
			'theme_slug' => get_template(),
			'item_name' => '',
			'license' => '',
			'version' => '',
			'author' => '',
			'download_id' => '',
			'renew_url' => '',
			'beta' => false,
		) );

		/**
		 * Fires after the theme $config is setup.
		 *
		 * @since x.x.x
		 *
		 * @param array $config Array of EDD SL theme data.
		 */
		do_action( 'post_edd_sl_theme_updater_setup', $config );

		// Set config arguments
		$this->remote_api_url = $config['remote_api_url'];
		$this->item_name = $config['item_name'];
		$this->theme_slug = sanitize_key( $config['theme_slug'] );
		$this->version = $config['version'];
		$this->author = $config['author'];
		$this->download_id = $config['download_id'];
		$this->renew_url = $config['renew_url'];
		$this->beta = $config['beta'];

		// Populate version fallback
		if ( '' == $config['version'] ) {
			$theme = wp_get_theme( $this->theme_slug );
			$this->version = $theme->get( 'Version' );
		}

		// Strings passed in from the updater config
		$this->strings = $strings;

		add_action( 'init', array( $this, 'updater' ) );
		add_action( 'admin_init', array( $this, 'register_option' ) );
		add_action( 'admin_init', array( $this, 'license_action' ) );
		add_action( 'admin_menu', array( $this, 'license_menu' ) );
		add_action( 'update_option_' . $this->theme_slug . '_license_key', array( $this, 'activate_license' ), 10, 2 );
		add_filter( 'http_request_args', array( $this, 'disable_wporg_request' ), 5, 2 );

	}

	/**
	 * Creates the updater class.
	 *
	 * since 1.0.0
	 */
	function updater() {
		if ( ! current_user_can( 'manage_options' ) ) {
			return;
		}

		/* If there is no valid license key status, don't allow updates. */
		if ( get_option( $this->theme_slug . '_license_key_status', false) != 'valid' ) {
			return;
		}

		if ( !class_exists( 'EDD_Theme_Updater' ) ) {
			// Load our custom theme updater
			include( dirname( __FILE__ ) . '/theme-updater-class.php' );
		}

		new EDD_Theme_Updater(
			array(
				'remote_api_url' 	=> $this->remote_api_url,
				'version' 			=> $this->version,
				'license' 			=> trim( get_option( $this->theme_slug . '_license_key' ) ),
				'item_name' 		=> $this->item_name,
				'author'			=> $this->author,
				'beta'              => $this->beta
			),
			$this->strings
		);
	}

	/**
	 * Adds a menu item for the theme license under the appearance menu.
	 *
	 * since 1.0.0
	 */
	function license_menu() {

		$strings = $this->strings;

		add_theme_page(
			$strings['theme-license'],
			$strings['theme-license'],
			'manage_options',
			$this->theme_slug . '-license',
			array( $this, 'license_page' )
		);
	}

	/**
	 * Outputs the markup used on the theme license page.
	 *
	 * since 1.0.0
	 */
	function license_page() {

		$strings = $this->strings;

		$license = trim( get_option( $this->theme_slug . '_license_key' ) );
		$status = get_option( $this->theme_slug . '_license_key_status', false );

		// Checks license status to display under license key
		if ( ! $license ) {
			$message    = $strings['enter-key'];
		} else {
			// delete_transient( $this->theme_slug . '_license_message' );
			if ( ! get_transient( $this->theme_slug . '_license_message', false ) ) {
				set_transient( $this->theme_slug . '_license_message', $this->check_license(), ( 60 * 60 * 24 ) );
			}
			$message = get_transient( $this->theme_slug . '_license_message' );
		}
		?>
		<div class="wrap">
			<h2><?php echo $strings['theme-license'] ?></h2>
			<form method="post" action="options.php">

				<?php settings_fields( $this->theme_slug . '-license' ); ?>

				<table class="form-table">
					<tbody>

						<tr valign="top">
							<th scope="row" valign="top">
								<?php echo $strings['license-key']; ?>
							</th>
							<td>
								<input id="<?php echo $this->theme_slug; ?>_license_key" name="<?php echo $this->theme_slug; ?>_license_key" type="text" class="regular-text" value="<?php echo esc_attr( $license ); ?>" />
                                <?php if ( ! empty ( $message ) ) { ?>
                                    <p class="description">
                                        <?php if ( 'License status is unknown.' === $message ) {
                                            printf( wp_kses( __( 'Please enter the license key of the installed theme and <u>not</u> the license key of the bundle. In <a href="%s">your customer account</a> you will find the license key of this theme.', 'mh-magazine' ), array(  'a' => array( 'href' => array() ), 'u' => array() ) ), esc_url( 'https://mhthemes.com/account/' ) );
                                        } else {
                                            echo $message;
                                        } ?>
                                    </p>
                                <?php } ?>
							</td>
						</tr>

						<?php if ( $license ) { ?>
						<tr valign="top">
							<th scope="row" valign="top">
								<?php echo $strings['license-action']; ?>
							</th>
							<td>
								<?php
								wp_nonce_field( $this->theme_slug . '_nonce', $this->theme_slug . '_nonce' );
								if ( 'valid' == $status ) { ?>
									<input type="submit" class="button-secondary" name="<?php echo $this->theme_slug; ?>_license_deactivate" value="<?php esc_attr_e( $strings['deactivate-license'] ); ?>"/>
								<?php } else { ?>
									<input type="submit" class="button-secondary" name="<?php echo $this->theme_slug; ?>_license_activate" value="<?php esc_attr_e( $strings['activate-license'] ); ?>"/>
								<?php }
								?>
							</td>
						</tr>
						<?php } ?>

					</tbody>
				</table>
				<?php submit_button(); ?>
			</form>

            <?php
            $icon_yes = '<span class="dashicons dashicons-yes-alt" style="color: green;"></span>';
            $icon_no = '<span class="dashicons dashicons-dismiss" style="color: red;"></span>';
            $icon_warning = '<span class="dashicons dashicons-warning" style="color: orange;"></span>';

            // PHP
            $php_version_installed = phpversion();
            $php_version_required = '5.6'; // https://www.php.net/releases/index.php
            $php_version_is_outdated = ( version_compare( $php_version_installed, $php_version_required, '<' ) ) ? true : false;

            // cURL
            $curl_installed = ( function_exists('curl_version') ) ? true : false;
            $curl_info = ( function_exists('curl_version') ) ? curl_version() : null;
            $curl_version_installed = ( ! empty( $curl_info['version'] ) ) ? $curl_info['version'] : null;
            $curl_version_required = '7.62.0'; // https://curl.haxx.se/docs//releases.html
            $curl_version_is_outdated = ( version_compare( $curl_version_installed, $curl_version_required, '<' ) ) ? true : false;

            /*
            'version_number' => int 475393
            'age' => int 4
            'features' => int 2736797
            'ssl_version_number' => int 0
            'version' => string '7.65.1' (length=6)
            'host' => string 'x86_64-apple-darwin13.4.0' (length=25)
            'ssl_version' => string 'OpenSSL/1.0.2o' (length=14)
            'libz_version' => string '1.2.8' (length=5)
            */

            $openssl_installed = ( extension_loaded('openssl') ) ? true : false;
            $oppenssl_version_installed = ( ! empty( $curl_info['ssl_version'] ) ) ? str_replace( 'OpenSSL/', '', $curl_info['ssl_version'] ) : null;
            ?>
            <h3><?php _e( 'Site Information', 'mh-magazine' ); ?></h3>
            <table class="widefat" style="max-width: 750px;">
                <thead>
                <tr>
                    <th>&nbsp;</th>
                    <th><?php _e('Status', 'mh-magazine' ); ?></th>
                    <th><?php _e('Information', 'mh-magazine' ); ?></th>
                </tr>
                </thead>
                <tbody>
                <tr>
                    <td>PHP</td>
                    <td>
                        <?php echo ( ! $php_version_is_outdated ) ? $icon_yes : $icon_no; ?>&nbsp;<?php printf( esc_html__( 'Version %s installed', 'mh-magazine' ), $php_version_installed ); ?>
                    </td>
                    <td>
                        <?php if ( $php_version_is_outdated ) { ?>
                            <?php printf( esc_html__( 'The installed version is no longer up-to-date and should be updated to version %s or higher.', 'mh-magazine' ), $php_version_required ); ?>
                        <?php } else { ?>
                            -
                        <?php } ?>
                    </td>
                </tr>
                <tr>
                    <td>PHP cURL</td>
                    <td>
                        <?php if ( $curl_installed ) { ?>
                            <?php echo ( ! $curl_version_is_outdated ) ? $icon_yes : $icon_no; ?>&nbsp;<?php printf( esc_html__( 'Version %s installed', 'mh-magazine' ), $curl_version_installed ); ?>
                        <?php } else { ?>
                            <?php echo $icon_no; ?>&nbsp;<?php _e('Not installed.', 'mh-magazine' ); ?>
                        <?php } ?>
                    </td>
                    <td>
                        <?php if ( ! $curl_installed ) { ?>
                            <?php _e('Please install as soon as possible to avoid problems.', 'mh-magazine' ); ?>
                        <?php } elseif ( $curl_version_is_outdated ) { ?>
                            <?php _e('The installed version is no longer up-to-date and should be updated.', 'mh-magazine' ); ?>
                        <?php } else { ?>
                            -
                        <?php } ?>
                    </td>
                </tr>
                <tr class="alternate">
                    <td>PHP OpenSSL</td>
                    <td>
                        <?php if ( $openssl_installed ) { ?>

                            <?php echo $icon_yes; ?>
                            &nbsp;<?php printf( esc_html__( 'Version %s installed', 'mh-magazine' ), $oppenssl_version_installed ); ?>

                        <?php } else { ?>
                            <?php echo $icon_no; ?>&nbsp;<?php _e('Not installed.', 'mh-magazine' ); ?>
                        <?php } ?>
                    </td>
                    <td>
                        <?php if ( ! $openssl_installed ) { ?>
                            <?php _e('Please install as soon as possible to avoid problems.', 'mh-magazine' ); ?>
                        <?php } else { ?>
                            -
                        <?php } ?>
                    </td>
                </tr>
                </tbody>
            </table>
		<?php
	}

	/**
	 * Registers the option used to store the license key in the options table.
	 *
	 * since 1.0.0
	 */
	function register_option() {
		register_setting(
			$this->theme_slug . '-license',
			$this->theme_slug . '_license_key',
			array( $this, 'sanitize_license' )
		);
	}

	/**
	 * Sanitizes the license key.
	 *
	 * since 1.0.0
	 *
	 * @param string $new License key that was submitted.
	 * @return string $new Sanitized license key.
	 */
	function sanitize_license( $new ) {

		$old = get_option( $this->theme_slug . '_license_key' );

		if ( $old && $old != $new ) {
			// New license has been entered, so must reactivate
			delete_option( $this->theme_slug . '_license_key_status' );
			delete_transient( $this->theme_slug . '_license_message' );
		}

		return $new;
	}

	/**
	 * Makes a call to the API.
	 *
	 * @since 1.0.0
	 *
	 * @param array $api_params to be used for wp_remote_get.
	 * @return array $response decoded JSON response.
	 */
	 function get_api_response( $api_params ) {

		// Call the custom API.
		$verify_ssl = (bool) apply_filters( 'edd_sl_api_request_verify_ssl', true );
		$response   = wp_remote_post( $this->remote_api_url, array( 'timeout' => 15, 'sslverify' => $verify_ssl, 'body' => $api_params ) );

		return $response;
	 }

	/**
	 * Activates the license key.
	 *
	 * @since 1.0.0
	 */
	function activate_license() {

		$license = trim( get_option( $this->theme_slug . '_license_key' ) );

		// Data to send in our API request.
		$api_params = array(
			'edd_action' => 'activate_license',
			'license'    => $license,
			'item_name'  => urlencode( $this->item_name ),
			'url'        => home_url()
		);

		$response = $this->get_api_response( $api_params );

		// make sure the response came back okay
		if ( is_wp_error( $response ) || 200 !== wp_remote_retrieve_response_code( $response ) ) {

			if ( is_wp_error( $response ) ) {
				$message = $response->get_error_message();
			} else {
				$message = __( 'An error occurred, please try again.' );
			}

			$base_url = admin_url( 'themes.php?page=' . $this->theme_slug . '-license' );
			$redirect = add_query_arg( array( 'sl_theme_activation' => 'false', 'message' => urlencode( $message ) ), $base_url );

			wp_redirect( $redirect );
			exit();

		} 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.' ),
							date_i18n( get_option( 'date_format' ), strtotime( $license_data->expires, current_time( 'timestamp' ) ) )
						);
						break;

					case 'disabled':
					case 'revoked' :

						$message = __( 'Your license key has been disabled.' );
						break;

					case 'missing' :

						$message = __( 'Invalid license.' );
						break;

					case 'invalid' :
					case 'site_inactive' :

						$message = __( 'Your license is not active for this URL.' );
						break;

					case 'item_name_mismatch' :

						$message = sprintf( __( 'This appears to be an invalid license key for %s.' ), $this->item_name );
						break;

					case 'no_activations_left':

						$message = __( 'Your license key has reached its activation limit.' );
						break;

					default :

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

				if ( ! empty( $message ) ) {
					$base_url = admin_url( 'themes.php?page=' . $this->theme_slug . '-license' );
					$redirect = add_query_arg( array( 'sl_theme_activation' => 'false', 'message' => urlencode( $message ) ), $base_url );

					wp_redirect( $redirect );
					exit();
				}

			}

		}

		// $response->license will be either "active" or "inactive"
		if ( $license_data && isset( $license_data->license ) ) {
			update_option( $this->theme_slug . '_license_key_status', $license_data->license );
			delete_transient( $this->theme_slug . '_license_message' );
		}

		wp_redirect( admin_url( 'themes.php?page=' . $this->theme_slug . '-license' ) );
		exit();

	}

	/**
	 * Deactivates the license key.
	 *
	 * @since 1.0.0
	 */
	function deactivate_license() {

		// Retrieve the license from the database.
		$license = trim( get_option( $this->theme_slug . '_license_key' ) );

		// Data to send in our API request.
		$api_params = array(
			'edd_action' => 'deactivate_license',
			'license'    => $license,
			'item_name'  => urlencode( $this->item_name ),
			'url'        => home_url()
		);

		$response = $this->get_api_response( $api_params );

		// make sure the response came back okay
		if ( is_wp_error( $response ) || 200 !== wp_remote_retrieve_response_code( $response ) ) {

			if ( is_wp_error( $response ) ) {
				$message = $response->get_error_message();
			} else {
				$message = __( 'An error occurred, please try again.' );
			}

			$base_url = admin_url( 'themes.php?page=' . $this->theme_slug . '-license' );
			$redirect = add_query_arg( array( 'sl_theme_activation' => 'false', 'message' => urlencode( $message ) ), $base_url );

			wp_redirect( $redirect );
			exit();

		} else {

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

			// $license_data->license will be either "deactivated" or "failed"
			if ( $license_data && ( $license_data->license == 'deactivated' ) ) {
				delete_option( $this->theme_slug . '_license_key_status' );
				delete_transient( $this->theme_slug . '_license_message' );
			}

		}

		if ( ! empty( $message ) ) {
			$base_url = admin_url( 'themes.php?page=' . $this->theme_slug . '-license' );
			$redirect = add_query_arg( array( 'sl_theme_activation' => 'false', 'message' => urlencode( $message ) ), $base_url );

			wp_redirect( $redirect );
			exit();
		}

		wp_redirect( admin_url( 'themes.php?page=' . $this->theme_slug . '-license' ) );
		exit();

	}

	/**
	 * Constructs a renewal link
	 *
	 * @since 1.0.0
	 */
	function get_renewal_link() {

		// If a renewal link was passed in the config, use that
		if ( '' != $this->renew_url ) {
			return $this->renew_url;
		}

		// If download_id was passed in the config, a renewal link can be constructed
		$license_key = trim( get_option( $this->theme_slug . '_license_key', false ) );
		if ( '' != $this->download_id && $license_key ) {
			$url = esc_url( $this->remote_api_url );
			$url .= '/checkout/?edd_license_key=' . $license_key . '&download_id=' . $this->download_id;
			return $url;
		}

		// Otherwise return the remote_api_url
		return $this->remote_api_url;

	}



	/**
	 * Checks if a license action was submitted.
	 *
	 * @since 1.0.0
	 */
	function license_action() {

		if ( isset( $_POST[ $this->theme_slug . '_license_activate' ] ) ) {
			if ( check_admin_referer( $this->theme_slug . '_nonce', $this->theme_slug . '_nonce' ) ) {
				$this->activate_license();
			}
		}

		if ( isset( $_POST[$this->theme_slug . '_license_deactivate'] ) ) {
			if ( check_admin_referer( $this->theme_slug . '_nonce', $this->theme_slug . '_nonce' ) ) {
				$this->deactivate_license();
			}
		}

	}

	/**
	 * Checks if license is valid and gets expire date.
	 *
	 * @since 1.0.0
	 *
	 * @return string $message License status message.
	 */
	function check_license() {

		$license = trim( get_option( $this->theme_slug . '_license_key' ) );
		$strings = $this->strings;

		$api_params = array(
			'edd_action' => 'check_license',
			'license'    => $license,
			'item_name'  => urlencode( $this->item_name ),
			'url'        => home_url()
		);

		$response = $this->get_api_response( $api_params );

		// make sure the response came back okay
		if ( is_wp_error( $response ) || 200 !== wp_remote_retrieve_response_code( $response ) ) {

			if ( is_wp_error( $response ) ) {
				$message = $response->get_error_message();
			} else {
				$message = $strings['license-status-unknown'];
			}

			$base_url = admin_url( 'themes.php?page=' . $this->theme_slug . '-license' );
			$redirect = add_query_arg( array( 'sl_theme_activation' => 'false', 'message' => urlencode( $message ) ), $base_url );

			wp_redirect( $redirect );
			exit();

		} else {

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

			// If response doesn't include license data, return
			if ( !isset( $license_data->license ) ) {
				$message = $strings['license-status-unknown'];
				return $message;
			}

			// We need to update the license status at the same time the message is updated
			if ( $license_data && isset( $license_data->license ) ) {
				update_option( $this->theme_slug . '_license_key_status', $license_data->license );
			}

			// Get expire date
			$expires = false;
			if ( isset( $license_data->expires ) && 'lifetime' != $license_data->expires ) {
				$expires = date_i18n( get_option( 'date_format' ), strtotime( $license_data->expires, current_time( 'timestamp' ) ) );
				$renew_link = '<a href="' . esc_url( $this->get_renewal_link() ) . '" target="_blank">' . $strings['renew'] . '</a>';
			} elseif ( isset( $license_data->expires ) && 'lifetime' == $license_data->expires ) {
				$expires = 'lifetime';
			}

			// Get site counts
			$site_count = $license_data->site_count;
			$license_limit = $license_data->license_limit;

			// If unlimited
			if ( 0 == $license_limit ) {
				$license_limit = $strings['unlimited'];
			}

			if ( $license_data->license == 'valid' ) {
				$message = $strings['license-key-is-active'] . ' ';
				if ( isset( $expires ) && 'lifetime' != $expires ) {
					$message .= sprintf( $strings['expires%s'], $expires ) . ' ';
				}
				if ( isset( $expires ) && 'lifetime' == $expires ) {
					$message .= $strings['expires-never'];
				}
				if ( $site_count && $license_limit ) {
					$message .= sprintf( $strings['%1$s/%2$-sites'], $site_count, $license_limit );
				}
			} else if ( $license_data->license == 'expired' ) {
				if ( $expires ) {
					$message = sprintf( $strings['license-key-expired-%s'], $expires );
				} else {
					$message = $strings['license-key-expired'];
				}
				if ( $renew_link ) {
					$message .= ' ' . $renew_link;
				}
			} else if ( $license_data->license == 'invalid' ) {
				$message = $strings['license-keys-do-not-match'];
			} else if ( $license_data->license == 'inactive' ) {
				$message = $strings['license-is-inactive'];
			} else if ( $license_data->license == 'disabled' ) {
				$message = $strings['license-key-is-disabled'];
			} else if ( $license_data->license == 'site_inactive' ) {
				// Site is inactive
				$message = $strings['site-is-inactive'];
			} else {
				$message = $strings['license-status-unknown'];
			}

		}

		return $message;
	}

	/**
	 * Disable requests to wp.org repository for this theme.
	 *
	 * @since 1.0.0
	 */
	function disable_wporg_request( $r, $url ) {

		// If it's not a theme update request, bail.
		if ( 0 !== strpos( $url, 'https://api.wordpress.org/themes/update-check/1.1/' ) ) {
 			return $r;
 		}

 		// Decode the JSON response
 		$themes = json_decode( $r['body']['themes'] );

 		// Remove the active parent and child themes from the check
 		$parent = get_option( 'template' );
 		$child = get_option( 'stylesheet' );
 		unset( $themes->themes->$parent );
 		unset( $themes->themes->$child );

 		// Encode the updated JSON response
 		$r['body']['themes'] = json_encode( $themes );

 		return $r;
	}

}
