<?php
/**
 * @license GPL-2.0-or-later
 *
 * Modified using {@see https://github.com/BrianHenryIE/strauss}.
 */

namespace GravityKit\GravityView\Foundation\Licenses;

use GravityKit\GravityView\Foundation\Logger\Framework as LoggerFramework;
use GravityKit\GravityView\Foundation\Helpers\Arr;
use Exception;
use ReflectionClass;

class EDD {
	/**
	 * Class instance.
	 *
	 * @since 1.0.0
	 *
	 * @var EDD|null
	 */
	private static $_instance = null;

	/**
	 * Returns class instance.
	 *
	 * @since 1.0.0
	 *
	 * @return EDD
	 */
	public static function get_instance() {
		if ( is_null( self::$_instance ) ) {
			self::$_instance = new self();
		}

		return self::$_instance;
	}

	/**
	 * Initializes the class.
	 *
	 * @since 1.0.0
	 *
	 * @return void
	 */
	public function init() {
		add_filter( 'pre_set_site_transient_update_plugins', [ $this, 'check_for_product_updates' ], 999 );
		add_filter( 'plugins_api', [ $this, 'display_product_information' ], 999, 3 );
		add_action( 'admin_init', [ $this, 'disable_legacy_edd_updater' ], 999 );
	}

	/**
	 * Disables EDD updater that's included with GravityKit products.
	 *
	 * @since 1.0.0
	 *
	 * @return void
	 */
	public function disable_legacy_edd_updater() {
		global $wp_filter;

		$filters_to_remove = [ 'pre_set_site_transient_update_plugins', 'plugins_api', 'after_plugin_row', 'admin_init' ];

		$legacy_edd_check = function () {
			try {
				$reflection = new ReflectionClass( get_class( $this ) );

				if ( ! $reflection->hasProperty( 'api_url' ) ) {
					return false;
				}

				$api_url_property = $reflection->getProperty( 'api_url' );
			} catch ( Exception $e ) {
				return false;
			}

			// $this is not an instance of EDD, but a bound class (see $remove_filter below).
			// @phpstan-ignore-next-line
			$api_url = $api_url_property->isStatic() ? $this::$api_url : $this->api_url;

			return preg_match( '/gravity(view|kit)\.com?/', $api_url );
		};

		$remove_filter = function ( $filter ) use ( $wp_filter, $legacy_edd_check ) {
			if ( empty( $wp_filter[ $filter ]->callbacks ) ) {
				return;
			}

			foreach ( $wp_filter[ $filter ]->callbacks as &$callback ) {
				foreach ( $callback as $key => &$hook ) {
					if ( ! is_array( $hook['function'] ) || ! is_object( $hook['function'][0] ) ) {
						continue;
					}

					// EDD_SL_Plugin_Updater->api_url is a private property, so we need a way to access it.
					$is_legacy_edd = $legacy_edd_check->bindTo( $hook['function'][0], get_class( $hook['function'][0] ) );

					if ( ! $is_legacy_edd() ) {
						continue;
					}

					unset( $callback[ $key ] );
				}
			}
		};

		foreach ( array_keys( $wp_filter ) as $filter ) {
			foreach ( $filters_to_remove as $filter_to_remove ) {
				// Older EDD_SL_Plugin_Updater class uses 'after_plugin_row_{plugin_file}' filter, so we can't just check for 'after_plugin_row'.
				if ( strpos( (string) $filter, $filter_to_remove ) !== false ) {
					$remove_filter( $filter );
				}
			}
		}
	}

	/**
	 * Checks for product updates and modifies the 'update_plugins' transient.
	 *
	 * @since 1.0.0
	 *
	 * @param object $transient_data Transient data.
	 * @param bool   $skip_cache     (optional) Whether to skip cache when getting products data. Default: false.
	 *
	 * @return object
	 */
	public function check_for_product_updates( $transient_data, $skip_cache = false ) {
		static $checked;

		if ( ! is_object( $transient_data ) || empty( $transient_data->checked ) ) {
			return $transient_data;
		}

		if ( ! $checked && ! $skip_cache && Arr::get( $_GET, 'force-check', false ) ) { // phpcs:ignore WordPress.Security.NonceVerification.Recommended
			$skip_cache = true;
		}

		try {
			$products_data = ProductManager::get_instance()->get_products_data(
				[
					'skip_request_cache' => true,
					'skip_remote_cache'  => $skip_cache,
				]
			);
		} catch ( Exception $e ) {
			LoggerFramework::get_instance()->error( "Can't get products data when checking for updated versions: " . $e->getMessage() );

			return $transient_data;
		}

		foreach ( $products_data as $product ) {
			if ( ! $product['update_available'] || ! $product['installed'] || $product['third_party'] ) {
				continue;
			}

			// @phpstan-ignore-next-line
			$transient_data->response[ $product['path'] ] = $this->format_product_data( $product );
		}

		$checked = true;

		return $transient_data;
	}

	/**
	 * Returns a product object formatted according to what WP expects in order to display changelog/store plugin update data.
	 *
	 * @since 1.0.0
	 *
	 * @see   ProductManager::get_products_data()
	 * @see   plugins_api()
	 *
	 * @param array $product Product data.
	 *
	 * @return object
	 */
	public function format_product_data( $product ) {
		$licenses_data = LicenseManager::get_instance()->get_licenses_data();

		$license = Arr::get( $product, 'licenses.0' );

		if ( $product['free'] && $product['download_link'] ) {
			$download_link = $product['download_link'];
		} else {
			$download_link = Arr::get( $licenses_data, "{$license}.products.{$product['id']}.download" );
		}

		$formatted_data = [
			'plugin'                 => $product['path'],
			'name'                   => $product['name'],
			'id'                     => $product['id'],
			'slug'                   => $product['slug'],
			'gk_product_text_domain' => $product['text_domain'],
			'version'                => $product['server_version'],
			'new_version'            => $product['server_version'],
			'url'                    => $product['link'],
			'homepage'               => $product['link'],
			'icons'                  => [
				'1x' => $product['icons']['1x'],
				'2x' => $product['icons']['2x'],
			],
			'banners'                => [
				'low'  => $product['banners']['low'],
				'high' => $product['banners']['high'],
			],
			'sections'               => [
				'description' => $product['sections']['description'],
				'changelog'   => $product['sections']['changelog'],
			],
			'requires'               => Arr::get( $product, 'system_requirements.wp.version' ),
			'tested'                 => Arr::get( $product, 'system_requirements.wp.tested' ),
			'requires_php'           => Arr::get( $product, 'system_requirements.php.version' ),
		];

		if ( $download_link && ( $product['free'] || ! empty( $product['licenses'] ) ) ) {
			$formatted_data['package']       = $download_link;
			$formatted_data['download_link'] = $download_link;
		}

		return (object) $formatted_data;
	}

	/**
	 * Returns product information for display on the Plugins page.
	 * This short-circuits the WordPress.org API request by returning product information from the EDD API that we store in the database.
	 *
	 * @since 1.0.0
	 *
	 * @param false|object|array $result Product information.
	 * @param string             $action Plugin Installation API action.
	 * @param object             $args   Request arguments.
	 *
	 * @return false|object|array
	 */
	public function display_product_information( $result, $action, $args ) {
		try {
			$products = ProductManager::get_instance()->get_products_data();
		} catch ( Exception $e ) {
			LoggerFramework::get_instance()->error( "Can't get products data when displaying the changelog: " . $e->getMessage() );

			return $result;
		}

		if ( 'plugin_information' !== $action || empty( $args->slug ) ) {
			return $result;
		}

		$product = Arr::first(
			$products,
			function ( $product ) use ( $args ) {
				return ! ( $product['third-party'] ?? '' ) && $product['slug'] === $args->slug;
			}
		);

		if ( ! $product ) {
			return $result;
		}

		return $this->format_product_data( $product );
	}
}
