<?php

namespace WLFMC_Appsero;

/**
 * WLFMC_Appsero Updater
 *
 * This class will show new updates project
 */
class Updater {

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

	/**
	 * Object of Updater
	 *
	 * @var object
	 */
	protected static $instance;

	/**
	 * Cache key
	 *
	 * @var string
	 */
	protected $cache_key;

	/**
	 * Initialize the class
	 *
	 * @param WLFMC_Appsero\Client
	 */
	public function __construct( Client $client ) {

		$this->client    = $client;
		$this->cache_key = 'appsero_' . md5( $this->client->slug ) . '_version_info';

		// Run hooks.
		if ( $this->client->type === 'plugin' ) {
			$this->run_plugin_hooks();
		} elseif ( $this->client->type === 'theme' ) {
			$this->run_theme_hooks();
		}
	}

	public static function init( $client ) {
		if ( ! self::$instance ) {
			self::$instance = new self( $client );
		}

		return self::$instance;
	}

	/**
	 * Set up WordPress filter to hooks to get update.
	 *
	 * @return void
	 */
	public function run_plugin_hooks() {
		add_filter( 'pre_set_site_transient_update_plugins', array( $this, 'check_plugin_update' ) );
		add_filter( 'plugins_api', array( $this, 'plugins_api_filter' ), 10, 3 );
	}

	/**
	 * Set up WordPress filter to hooks to get update.
	 *
	 * @return void
	 */
	public function run_theme_hooks() {
		add_filter( 'pre_set_site_transient_update_themes', array( $this, 'check_theme_update' ) );
	}

	/**
	 * Check for Update for this specific project
	 */
	public function check_plugin_update( $transient_data ) {
		global $pagenow;

		if ( ! is_object( $transient_data ) ) {
			$transient_data = new \stdClass();
		}

		if ( 'plugins.php' === $pagenow && is_multisite() ) {
			return $transient_data;
		}

		if ( ! empty( $transient_data->response ) && ! empty( $transient_data->response[ $this->client->basename ] ) ) {
			return $transient_data;
		}

		$version_info = $this->get_version_info();

		if ( false !== $version_info && is_object( $version_info ) && isset( $version_info->new_version ) ) {
			unset( $version_info->sections );

			// If new version available then set to `response`.
			if ( version_compare( $this->client->project_version, $version_info->new_version, '<' ) ) {
				$transient_data->response[ $this->client->basename ] = $version_info;
			} else {
				// If new version is not available then set to `no_update`.
				$transient_data->no_update[ $this->client->basename ] = $version_info;
			}

			$transient_data->last_checked                       = time();
			$transient_data->checked[ $this->client->basename ] = $this->client->project_version;
		}

		return $transient_data;
	}

	/**
	 * Get version info from database
	 *
	 * @return Object|boolean
	 */
	private function get_cached_version_info() {
		global $pagenow;

		// If updater page then fetch from API now.
		if ( 'update-core.php' === $pagenow ) {
			return false; // Force to fetch data.
		}

		$value = get_transient( $this->cache_key );

		if ( ! $value && ! isset( $value->name ) ) {
			return false; // Cache is expired.
		}

		// We need to turn the icons into an array.
		if ( isset( $value->icons ) ) {
			$value->icons = (array) $value->icons;
		}

		// We need to turn the banners into an array.
		if ( isset( $value->banners ) ) {
			$value->banners = (array) $value->banners;
		}

		if ( isset( $value->sections ) ) {
			$value->sections = (array) $value->sections;
		}

		return $value;
	}

	/**
	 * Set version info to database
	 */
	private function set_cached_version_info( $value ) {
		if ( ! $value ) {
			return;
		}

		set_transient( $this->cache_key, $value, 3 * HOUR_IN_SECONDS );
	}

	/**
	 * Get plugin info from WLFMC_Appsero
	 */
	private function get_project_latest_version() {

		$license = $this->client->license()->get_license();

		$params = array(
			'version'     => $this->client->project_version,
			'name'        => $this->client->name,
			'slug'        => $this->client->slug,
			'basename'    => $this->client->basename,
			'license_key' => ! empty( $license ) && isset( $license['key'] ) ? $license['key'] : '',
		);

		$route = 'update/' . $this->client->hash . '/check';

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

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

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

		if ( ! isset( $response->slug ) ) {
			return false;
		}

		if ( isset( $response->icons ) ) {
			$response->icons = (array) $response->icons;
		}

		if ( isset( $response->banners ) ) {
			$response->banners = (array) $response->banners;
		}

		if ( isset( $response->sections ) ) {
			$response->sections = (array) $response->sections;
		}

		return $response;
	}

	/**
	 * Updates information on the "View version x.x details" page with custom data.
	 *
	 * @param mixed  $data
	 * @param string $action
	 * @param object $args
	 *
	 * @return object $data
	 */
	public function plugins_api_filter( $data, $action = '', $args = null ) {

		if ( $action !== 'plugin_information' ) {
			return $data;
		}

		if ( ! isset( $args->slug ) || ( $args->slug !== $this->client->slug ) ) {
			return $data;
		}

		return $this->get_version_info();
	}

	/**
	 * Check theme upate
	 */
	public function check_theme_update( $transient_data ) {
		global $pagenow;

		if ( ! is_object( $transient_data ) ) {
			$transient_data = new \stdClass();
		}

		if ( 'themes.php' === $pagenow && is_multisite() ) {
			return $transient_data;
		}

		if ( ! empty( $transient_data->response ) && ! empty( $transient_data->response[ $this->client->slug ] ) ) {
			return $transient_data;
		}

		$version_info = $this->get_version_info();

		if ( false !== $version_info && is_object( $version_info ) && isset( $version_info->new_version ) ) {

			// If new version available then set to `response`.
			if ( version_compare( $this->client->project_version, $version_info->new_version, '<' ) ) {
				$transient_data->response[ $this->client->slug ] = (array) $version_info;
			} else {
				// If new version is not available then set to `no_update`.
				$transient_data->no_update[ $this->client->slug ] = (array) $version_info;
			}

			$transient_data->last_checked                   = time();
			$transient_data->checked[ $this->client->slug ] = $this->client->project_version;
		}

		return $transient_data;
	}

	/**
	 * Get version information
	 */
	private function get_version_info() {
		$version_info = $this->get_cached_version_info();

		if ( false === $version_info ) {
			$version_info = $this->get_project_latest_version();
			$this->set_cached_version_info( $version_info );
		}

		return $version_info;
	}

}
