<?php

	use Reflect\Call;
	use Reflect\{Response, Path};
	use ReflectRules\{Ruleset, Rules, Type};

	use VLW\API\Endpoints;

	require_once Path::root("src/Endpoints.php");

	const PARM_FORCE_RECACHE = "force_recache";

	class GET_AboutLanguages {
		protected Ruleset $ruleset;

		public function __construct() {
			$this->ruleset = new Ruleset(strict: true);

			$this->ruleset->GET([
				(new Rules(PARM_FORCE_RECACHE))
					->type(Type::BOOLEAN)
					->default(false)
			]);

			$this->ruleset->validate_or_exit();
		}

		private static function cache_exists(): bool {
			return file_exists($_ENV["forgejo_languages"]["cache_file"]);
		}

		private static function load_cache(): array {
			return json_decode(file_get_contents($_ENV["forgejo_languages"]["cache_file"]), true);
		}

		public function main(): Response {
			// Delete cache file if force flag is set
			if ($_GET[PARM_FORCE_RECACHE]) {
				(new Call(Endpoints::ABOUT_LANGUAGES->value))->delete();
			}

			return self::cache_exists()
				// Return languages from cache
				? new Response(self::load_cache())
				// Fetch and return languages (and generate cache file if enabled)
				: new Response((new Call(Endpoints::ABOUT_LANGUAGES->value))->post());
		}
	}