<?php
declare(strict_types=1);

namespace Namespace\Scripts;

use Composer\Installer\PackageEvent;

class Composer
{
	/**
	 * Location of the object cache file.
	 *
	 * @param string
	 */
	protected static $objectCacheFilePath = './web/wp-content/object-cache.php';

	/**
	 * Create the symlink for object-cache.php when wp-redis is installed or
	 * updated.
	 *
	 * @param PackageEvent $event The event being executed.
	 * @return void
	 */
	public static function addObjectCacheSymlink(PackageEvent $event): void
	{
		$operation = $event->getOperation();

		if (!method_exists($operation, 'getPackage')) {
			return;
		}

		$installedPackage = $operation->getPackage();

		if ($installedPackage->getName() !== 'wpackagist-plugin/wp-redis') {
			return;
		}

		$io = $event->getIO();

		if (is_link(static::$objectCacheFilePath)) {
			$io->write('Symlink for object-cache.php already exists.');
			return;
		}

		try {
			$result = symlink(
				'./plugins/wp-redis/object-cache.php',
				static::$objectCacheFilePath,
			);

			if (!$result) {
				throw new Exception();
			}
		} catch (\Exception $e) {
			$io->writeError('Could not create object-cache.php symlink.');
			return;
		}

		$io->write('Created object-cache.php symlink for wp-redis.');
	}

	/**
	 * Remove the object-cache.php symlink when wp-redis is uninstalled.
	 *
	 * @param PackageEvent $event The event being executed.
	 * @return void
	 */
	public static function removeObjectCacheSymlink(PackageEvent $event): void
	{
		$installedPackage = $event->getOperation()->getPackage();

		if ($installedPackage->getName() !== 'wpackagist-plugin/wp-redis') {
			return;
		}

		$io = $event->getIO();

		try {
			$result = unlink(static::$objectCacheFilePath);

			if (!$result) {
				throw new \Exception();
			}
		} catch (\Exception $e) {
			$io->writeError('Failed to remove object-cache.php symlink. It may have already been removed.');
			return;
		}

		$io->write('Created object-cache.php symlink for wp-redis.');
	}
}