<?php
namespace WLFMC_Appsero;

/**
 * WLFMC_Appsero License Checker
 *
 * This class will check, active and deactive license
 */
class License {

	/**
	 * WLFMC_Appsero\Client
	 *
	 * @var object
	 */
	protected $client;

	/**
	 * Arguments of create menu
	 *
	 * @var array
	 */
	protected $menu_args;

	/**
	 * `option_name` of `wp_options` table
	 *
	 * @var string
	 */
	protected $option_key;

	/**
	 * Error message of HTTP request
	 *
	 * @var string
	 */
	public $error;

	/**
	 * Success message on form submit
	 *
	 * @var string
	 */
	public $success;

	/**
	 * Corn schedule hook name
	 *
	 * @var string
	 */
	protected $schedule_hook;

	/**
	 * Set value for valid licnese
	 *
	 * @var bool
	 */
	private $is_valid_licnese = null;

	/**
	 * Initialize the class
	 *
	 * @param WLFMC_Appsero\Client
	 */
	public function __construct( Client $client ) {
		$this->client = $client;

		$this->option_key = 'appsero_' . md5( $this->client->slug ) . '_manage_license';

		$this->schedule_hook = $this->client->slug . '_license_check_event';

		// Creating WP Ajax Endpoint to refresh license remotely
		add_action( 'wp_ajax_appsero_refresh_license_' . $this->client->hash, array( $this, 'refresh_license_api' ) );

		// Run hook to check license status daily
		add_action( $this->schedule_hook, array( $this, 'check_license_status' ) );

		// Active/Deactive corn schedule
		$this->run_schedule();
	}

	/**
	 * Set the license option key.
	 *
	 * If someone wants to override the default generated key.
	 *
	 * @param string $key
	 *
	 * @since 1.3.0
	 *
	 * @return License
	 */
	public function set_option_key( $key ) {
		$this->option_key = $key;

		return $this;
	}

	/**
	 * Get the license key
	 *
	 * @since 1.3.0
	 *
	 * @return string|null
	 */
	public function get_license() {
		return get_option( $this->option_key, null );
	}

	/**
	 * Check license
	 *
	 * @return bool
	 */
	public function check( $license_key ) {
		$route = 'public/license/' . $this->client->hash . '/check';

		return $this->send_request( $license_key, $route );
	}

	/**
	 * Active a license
	 *
	 * @return bool
	 */
	public function activate( $license_key ) {
		$route = 'public/license/' . $this->client->hash . '/activate';

		return $this->send_request( $license_key, $route );
	}

	/**
	 * Deactivate a license
	 *
	 * @return bool
	 */
	public function deactivate( $license_key ) {
		$route = 'public/license/' . $this->client->hash . '/deactivate';

		return $this->send_request( $license_key, $route );
	}

	/**
	 * Send common request
	 *
	 * @param $license_key
	 * @param $route
	 *
	 * @return array
	 */
	protected function send_request( $license_key, $route ) {
		$params = array(
			'license_key' => $license_key,
			'url'         => esc_url( home_url() ),
			'is_local'    => $this->client->is_local_server(),
		);

		$response = $this->client->send_request( $params, $route, true );

		if ( is_wp_error( $response ) ) {
			/** @var WP_Error $response */
			return array(
				'success' => false,
				'error'   => $response->get_error_message(),
			);
		}

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

		if ( empty( $response ) || isset( $response['exception'] ) ) {
			return array(
				'success' => false,
				'error'   => $this->client->__trans( 'Unknown error occurred, Please try again.' ),
			);
		}

		if ( isset( $response['errors'] ) && isset( $response['errors']['license_key'] ) ) {
			$response = array(
				'success' => false,
				'error'   => $response['errors']['license_key'][0],
			);
		}

		return $response;
	}

	/**
	 * License Refresh Endpoint
	 */
	public function refresh_license_api() {
		$this->check_license_status();

		return wp_send_json(
			array(
				'message' => 'License refreshed successfully.',
			),
			200
		);
	}

	/**
	 * Add settings page for license
	 *
	 * @param array $args
	 *
	 * @return void
	 */
	public function add_settings_page( $args = array() ) {
		$defaults = array(
			'type'        => 'menu', // Can be: menu, options, submenu
			'page_title'  => 'Manage License',
			'menu_title'  => 'Manage License',
			'capability'  => 'manage_options',
			'menu_slug'   => $this->client->slug . '-manage-license',
			'icon_url'    => '',
			'position'    => null,
			'parent_slug' => '',
		);

		$this->menu_args = wp_parse_args( $args, $defaults );

		add_action( 'admin_menu', array( $this, 'admin_menu' ), 99 );
	}

	/**
	 * Admin Menu hook
	 *
	 * @return void
	 */
	public function admin_menu() {
		switch ( $this->menu_args['type'] ) {
			case 'menu':
				$this->create_menu_page();
				break;

			case 'submenu':
				$this->create_submenu_page();
				break;

			case 'options':
				$this->create_options_page();
				break;
		}
	}

	/**
	 * License menu output
	 */
	public function menu_output() {
		// process form data if submitted
		if ( isset( $_POST['_nonce'] ) && wp_verify_nonce( sanitize_key( wp_unslash( $_POST['_nonce'] ) ), $this->client->name ) ) {
			$form_data = array(
				'_nonce' => sanitize_key( wp_unslash( $_POST['_nonce'] ) ),
				'_action' => isset( $_POST['_action'] ) ? sanitize_text_field( wp_unslash( $_POST['_action'] ) ) : '',
				'license_key' => isset( $_POST['license_key'] ) ? sanitize_text_field( wp_unslash( $_POST['license_key'] ) ) : '',
			);
			$this->license_form_submit( $form_data );
		}

		$license = $this->get_license();
		$action  = ( $license && isset( $license['status'] ) && 'activate' == $license['status'] ) ? 'deactive' : 'active';
		$this->licenses_style();
		?>

		<div class="wrap appsero-license-settings-wrapper">
			<h1>License Settings</h1>

			<?php
				$this->show_license_page_notices();
				do_action( 'before_appsero_license_section' );
			?>

			<div class="appsero-license-settings appsero-license-section">
				<?php $this->show_license_page_card_header( $license ); ?>

				<div class="appsero-license-details">
					<p>
						<?php printf( $this->client->__trans( 'Activate <strong>%s</strong> by your license key to get professional support and automatic update from your WordPress dashboard.' ), $this->client->name ); ?>
					</p>
					<form method="post" novalidate="novalidate" spellcheck="false">
						<input type="hidden" name="_action" value="<?php echo $action; ?>">
						<input type="hidden" name="_nonce" value="<?php echo wp_create_nonce( $this->client->name ); ?>">
						<div class="license-input-fields">
							<div class="license-input-key">
								<svg enable-background="new 0 0 512 512" version="1.1" viewBox="0 0 512 512" xml:space="preserve" xmlns="http://www.w3.org/2000/svg">
									<path d="m463.75 48.251c-64.336-64.336-169.01-64.335-233.35 1e-3 -43.945 43.945-59.209 108.71-40.181 167.46l-185.82 185.82c-2.813 2.813-4.395 6.621-4.395 10.606v84.858c0 8.291 6.709 15 15 15h84.858c3.984 0 7.793-1.582 10.605-4.395l21.211-21.226c3.237-3.237 4.819-7.778 4.292-12.334l-2.637-22.793 31.582-2.974c7.178-0.674 12.847-6.343 13.521-13.521l2.974-31.582 22.793 2.651c4.233 0.571 8.496-0.85 11.704-3.691 3.193-2.856 5.024-6.929 5.024-11.206v-27.929h27.422c3.984 0 7.793-1.582 10.605-4.395l38.467-37.958c58.74 19.043 122.38 4.929 166.33-39.046 64.336-64.335 64.336-169.01 0-233.35zm-42.435 106.07c-17.549 17.549-46.084 17.549-63.633 0s-17.549-46.084 0-63.633 46.084-17.549 63.633 0 17.548 46.084 0 63.633z"/>
								</svg>
								<input type="text" value="<?php echo $this->get_input_license_value( $action, $license ); ?>"
									   placeholder="<?php echo esc_attr( $this->client->__trans( 'Enter your license key to activate' ) ); ?>" name="license_key"
									<?php echo ( 'deactive' === $action ) ? 'readonly="readonly"' : ''; ?>
								/>
							</div>
							<button type="submit" name="submit" class="<?php echo 'deactive' === $action ? 'deactive-button' : ''; ?>">
								<?php echo $action === 'active' ? $this->client->__trans( 'Activate License' ) : $this->client->__trans( 'Deactivate License' ); ?>
							</button>
						</div>
					</form>

					<?php
					if ( 'deactive' === $action && isset( $license['remaining'] ) ) {
						$this->show_active_license_info( $license );
					}
					?>
				</div>
			</div> <!-- /.appsero-license-settings -->

			<?php do_action( 'after_appsero_license_section' ); ?>
		</div>
		<?php
	}

	/**
	 * License form submit
	 */
	public function license_form_submit( $form ) {
		if ( ! isset( $form_data['_nonce'] ) ) {
			return;
		}
		if ( ! isset( $form['_nonce'], $form['_action'] ) ) {
			$this->error = $this->client->__trans( 'Please add all information' );

			return;
		}

		if ( ! wp_verify_nonce( sanitize_key( wp_unslash( $form_data['_nonce'] ) ), $this->client->name ) ) {
			$this->error = $this->client->__trans( 'Nonce vefification failed.' );

			return;
		}

		if ( ! current_user_can( 'manage_options' ) ) {
			$this->error = $this->client->__trans( 'You don\'t have permission to manage license.' );

			return;
		}

		$license_key = ! empty( $form_data['license_key'] ) ? sanitize_text_field( wp_unslash( $form_data['license_key'] ) ) : '';
		$action      = ! empty( $form_data['_action'] ) ? sanitize_text_field( wp_unslash( $form_data['_action'] ) ) : '';

		switch ( $action ) {
			case 'active':
				$this->active_client_license( $license_key );
				break;

			case 'deactive':
				$this->deactive_client_license();
				break;

			case 'refresh':
				$this->refresh_client_license();
				break;
		}
	}

	/**
	 * Check license status on schedule
	 */
	public function check_license_status() {
		$license = $this->get_license();

		if ( isset( $license['key'] ) && ! empty( $license['key'] ) ) {
			$response = $this->check( $license['key'] );

			if ( isset( $response['success'] ) && $response['success'] ) {
				$license['status']           = 'activate';
				$license['remaining']        = $response['remaining'];
				$license['activation_limit'] = $response['activation_limit'];
				$license['expiry_days']      = $response['expiry_days'];
				$license['title']            = $response['title'];
				$license['source_id']        = $response['source_identifier'];
				$license['recurring']        = $response['recurring'];
			} else {
				$license['status']      = 'deactivate';
				$license['expiry_days'] = 0;
			}

			update_option( $this->option_key, $license, false );
		}
	}

	/**
	 * Check this is a valid license
	 */
	public function is_valid() {
		if ( null !== $this->is_valid_licnese ) {
			return $this->is_valid_licnese;
		}

		$license = $this->get_license();

		if ( ! empty( $license['key'] ) && isset( $license['status'] ) && $license['status'] === 'activate' ) {
			$this->is_valid_licnese = true;
		} else {
			$this->is_valid_licnese = false;
		}

		return $this->is_valid_licnese;
	}

	/**
	 * Check this is a valid license
	 */
	public function is_valid_by( $option, $value ) {
		$license = $this->get_license();

		if ( ! empty( $license['key'] ) && isset( $license['status'] ) && $license['status'] === 'activate' ) {
			if ( isset( $license[ $option ] ) && $license[ $option ] === $value ) {
				return true;
			}
		}

		return false;
	}

	/**
	 * Styles for licenses page
	 */
	private function licenses_style() {
		?>
		<style type="text/css">
			.appsero-license-section {
				width: 100%;
				max-width: 1100px;
				min-height: 1px;
				box-sizing: border-box;
			}
			.appsero-license-settings {
				background-color: #fff;
				box-shadow: 0px 3px 10px rgba(16, 16, 16, 0.05);
			}
			.appsero-license-settings * {
				box-sizing: border-box;
			}
			.appsero-license-title {
				background-color: #F8FAFB;
				border-bottom: 2px solid #EAEAEA;
				display: flex;
				align-items: center;
				padding: 10px 20px;
			}
			.appsero-license-title svg {
				width: 30px;
				height: 30px;
				fill: #0082BF;
			}
			.appsero-license-title span {
				font-size: 17px;
				color: #444444;
				margin-left: 10px;
			}
			.appsero-license-details {
				padding: 20px;
			}
			.appsero-license-details p {
				font-size: 15px;
				margin: 0 0 20px 0;
			}
			.license-input-key {
				position: relative;
				flex: 0 0 72%;
				max-width: 72%;
			}
			.license-input-key input {
				background-color: #F9F9F9;
				padding: 10px 15px 10px 48px;
				border: 1px solid #E8E5E5;
				border-radius: 3px;
				height: 45px;
				font-size: 16px;
				color: #71777D;
				width: 100%;
				box-shadow: 0 0 0 transparent;
			}
			.license-input-key input:focus {
				outline: 0 none;
				border: 1px solid #E8E5E5;
				box-shadow: 0 0 0 transparent;
			}
			.license-input-key svg {
				width: 22px;
				height: 22px;
				fill: #0082BF;
				position: absolute;
				left: 14px;
				top: 13px;
			}
			.license-input-fields {
				display: flex;
				justify-content: space-between;
				margin-bottom: 30px;
				max-width: 850px;
				width: 100%;
			}
			.license-input-fields button {
				color: #fff;
				font-size: 17px;
				padding: 8px;
				height: 46px;
				background-color: #0082BF;
				border-radius: 3px;
				cursor: pointer;
				flex: 0 0 25%;
				max-width: 25%;
				border: 1px solid #0082BF;
			}
			.license-input-fields button.deactive-button {
				background-color: #E40055;
				border-color: #E40055;
			}
			.license-input-fields button:focus {
				outline: 0 none;
			}
			.active-license-info {
				display: flex;
			}
			.single-license-info {
				min-width: 220px;
				flex: 0 0 30%;
			}
			.single-license-info h3 {
				font-size: 18px;
				margin: 0 0 12px 0;
			}
			.single-license-info p {
				margin: 0;
				color: #00C000;
			}
			.single-license-info p.occupied {
				color: #E40055;
			}
			.appsero-license-right-form {
				margin-left: auto;
			}
			.appsero-license-refresh-button {
				padding: 6px 10px 4px 10px;
				border: 1px solid #0082BF;
				border-radius: 3px;
				margin-left: auto;
				background-color: #0082BF;
				color: #fff;
				cursor: pointer;
			}
			.appsero-license-refresh-button .dashicons {
				color: #fff;
				margin-left: 0;
			}
		</style>
		<?php
	}

	/**
	 * Show active license information
	 */
	private function show_active_license_info( $license ) {
		?>
		<div class="active-license-info">
			<div class="single-license-info">
				<h3><?php $this->client->_etrans( 'Activations Remaining' ); ?></h3>
				<?php if ( empty( $license['activation_limit'] ) ) { ?>
					<p><?php $this->client->_etrans( 'Unlimited' ); ?></p>
				<?php } else { ?>
					<p class="<?php echo $license['remaining'] ? '' : 'occupied'; ?>">
						<?php printf( $this->client->__trans( '%1$d out of %2$d' ), $license['remaining'], $license['activation_limit'] ); ?>
					</p>
				<?php } ?>
			</div>
			<div class="single-license-info">
				<h3><?php $this->client->_etrans( 'Expires in' ); ?></h3>
				<?php
				if ( false !== $license['expiry_days'] ) {
					$occupied = $license['expiry_days'] > 21 ? '' : 'occupied';
					echo '<p class="' . $occupied . '">' . $license['expiry_days'] . ' days</p>';
				} else {
					echo '<p>' . $this->client->__trans( 'Never' ) . '</p>';
				}
				?>
			</div>
		</div>
		<?php
	}

	/**
	 * Show license settings page notices
	 */
	private function show_license_page_notices() {
		if ( ! empty( $this->error ) ) {
			?>
			<div class="notice notice-error is-dismissible appsero-license-section">
				<p><?php echo $this->error; ?></p>
			</div>
			<?php
		}

		if ( ! empty( $this->success ) ) {
			?>
			<div class="notice notice-success is-dismissible appsero-license-section">
				<p><?php echo $this->success; ?></p>
			</div>
			<?php
		}
		echo '<br />';
	}

	/**
	 * Card header
	 */
	private function show_license_page_card_header( $license ) {
		?>
		<div class="appsero-license-title">
			<svg enable-background="new 0 0 299.995 299.995" version="1.1" viewBox="0 0 300 300" xml:space="preserve" xmlns="http://www.w3.org/2000/svg">
				<path d="m150 161.48c-8.613 0-15.598 6.982-15.598 15.598 0 5.776 3.149 10.807 7.817 13.505v17.341h15.562v-17.341c4.668-2.697 7.817-7.729 7.817-13.505 0-8.616-6.984-15.598-15.598-15.598z"/>
				<path d="m150 85.849c-13.111 0-23.775 10.665-23.775 23.775v25.319h47.548v-25.319c-1e-3 -13.108-10.665-23.775-23.773-23.775z"/>
				<path d="m150 1e-3c-82.839 0-150 67.158-150 150 0 82.837 67.156 150 150 150s150-67.161 150-150c0-82.839-67.161-150-150-150zm46.09 227.12h-92.173c-9.734 0-17.626-7.892-17.626-17.629v-56.919c0-8.491 6.007-15.582 14.003-17.25v-25.697c0-27.409 22.3-49.711 49.711-49.711 27.409 0 49.709 22.3 49.709 49.711v25.697c7.993 1.673 14 8.759 14 17.25v56.919h2e-3c0 9.736-7.892 17.629-17.626 17.629z"/>
			</svg>
			<span><?php echo $this->client->__trans( 'Activate License' ); ?></span>

			<?php if ( $license && $license['key'] ) : ?>
				<form method="post" class="appsero-license-right-form" novalidate="novalidate" spellcheck="false">
					<input type="hidden" name="_action" value="refresh">
					<input type="hidden" name="_nonce" value="<?php echo wp_create_nonce( $this->client->name ); ?>">
					<button type="submit" name="submit" class="appsero-license-refresh-button">
						<span class="dashicons dashicons-update"></span>
						<?php echo $this->client->__trans( 'Refresh License' ); ?>
					</button>
				</form>
			<?php endif; ?>

		</div>
		<?php
	}

	/**
	 * Active client license
	 */
	private function active_client_license( $license_key ) {
		if ( empty( $license_key ) ) {
			$this->error = $this->client->__trans( 'The license key field is required.' );

			return;
		}

		$response    = $this->activate( $license_key );

		if ( ! $response['success'] ) {
			$this->error = $response['error'] ? $response['error'] : $this->client->__trans( 'Unknown error occurred.' );

			return;
		}

		$data = array(
			'key'              => $license_key,
			'status'           => 'activate',
			'remaining'        => $response['remaining'],
			'activation_limit' => $response['activation_limit'],
			'expiry_days'      => $response['expiry_days'],
			'title'            => $response['title'],
			'source_id'        => $response['source_identifier'],
			'recurring'        => $response['recurring'],
		);

		update_option( $this->option_key, $data, false );

		$this->success = $this->client->__trans( 'License activated successfully.' );
	}

	/**
	 * Deactive client license
	 */
	private function deactive_client_license( $form ) {
		$license = $this->get_license();

		if ( empty( $license['key'] ) ) {
			$this->error = $this->client->__trans( 'License key not found.' );

			return;
		}

		$response = $this->deactivate( $license['key'] );

		$data = array(
			'key'    => '',
			'status' => 'deactivate',
		);

		update_option( $this->option_key, $data, false );

		if ( ! $response['success'] ) {
			$this->error = $response['error'] ? $response['error'] : $this->client->__trans( 'Unknown error occurred.' );

			return;
		}

		$this->success = $this->client->__trans( 'License deactivated successfully.' );
	}

	/**
	 * Refresh Client License
	 */
	private function refresh_client_license( $form = null ) {
		$license = $this->get_license();

		if ( ! $license || ! isset( $license['key'] ) || empty( $license['key'] ) ) {
			$this->error = $this->client->__trans( 'License key not found' );
			return;
		}

		$this->check_license_status();

		$this->success = $this->client->__trans( 'License refreshed successfully.' );
	}

	/**
	 * Add license menu page
	 */
	private function create_menu_page() {
		call_user_func(
			'add_menu_page',
			$this->menu_args['page_title'],
			$this->menu_args['menu_title'],
			$this->menu_args['capability'],
			$this->menu_args['menu_slug'],
			array( $this, 'menu_output' ),
			$this->menu_args['icon_url'],
			$this->menu_args['position']
		);
	}

	/**
	 * Add submenu page
	 */
	private function create_submenu_page() {
		call_user_func(
			'add_submenu_page',
			$this->menu_args['parent_slug'],
			$this->menu_args['page_title'],
			$this->menu_args['menu_title'],
			$this->menu_args['capability'],
			$this->menu_args['menu_slug'],
			array( $this, 'menu_output' ),
			$this->menu_args['position']
		);
	}

	/**
	 * Add submenu page
	 */
	private function create_options_page() {
		call_user_func(
			'add_options_page',
			$this->menu_args['page_title'],
			$this->menu_args['menu_title'],
			$this->menu_args['capability'],
			$this->menu_args['menu_slug'],
			array( $this, 'menu_output' ),
			$this->menu_args['position']
		);
	}

	/**
	 * Schedule daily sicense checker event
	 */
	public function schedule_cron_event() {
		if ( ! wp_next_scheduled( $this->schedule_hook ) ) {
			wp_schedule_event( time(), 'daily', $this->schedule_hook );

			wp_schedule_single_event( time() + 20, $this->schedule_hook );
		}
	}

	/**
	 * Clear any scheduled hook
	 */
	public function clear_scheduler() {
		wp_clear_scheduled_hook( $this->schedule_hook );
	}

	/**
	 * Enable/Disable schedule
	 */
	private function run_schedule() {
		switch ( $this->client->type ) {
			case 'plugin':
				register_activation_hook( $this->client->file, array( $this, 'schedule_cron_event' ) );
				register_deactivation_hook( $this->client->file, array( $this, 'clear_scheduler' ) );
				break;

			case 'theme':
				add_action( 'after_switch_theme', array( $this, 'schedule_cron_event' ) );
				add_action( 'switch_theme', array( $this, 'clear_scheduler' ) );
				break;
		}
	}

	/**
	 * Get input license key
	 *
	 * @param  $action
	 *
	 * @return $license
	 */
	private function get_input_license_value( $action, $license ) {
		if ( 'active' === $action ) {
			return isset( $license['key'] ) ? $license['key'] : '';
		}

		if ( 'deactive' === $action ) {
			$key_length = strlen( $license['key'] );

			return str_pad(
				substr( $license['key'], 0, $key_length / 2 ),
				$key_length,
				'*'
			);
		}

		return '';
	}

}
