<?php
/*
 * ExpressionController.php
 * Copyright (c) 2024 Michael Thomas
 *
 * This file is part of Firefly III (https://github.com/firefly-iii).
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

declare(strict_types=1);

namespace FireflyIII\Api\V1\Controllers\Models\Rule;

use FireflyIII\Api\V1\Controllers\Controller;
use FireflyIII\Api\V1\Requests\Models\Rule\ValidateExpressionRequest;
use FireflyIII\Repositories\Rule\RuleRepositoryInterface;
use FireflyIII\TransactionRules\Expressions\ActionExpressionEvaluator;
use FireflyIII\TransactionRules\Factory\ExpressionLanguageFactory;
use FireflyIII\User;
use Illuminate\Http\JsonResponse;
use Symfony\Component\ExpressionLanguage\SyntaxError;

/**
 * Class ExpressionController
 */
class ExpressionController extends Controller
{
    private RuleRepositoryInterface $ruleRepository;

    /**
     * RuleController constructor.
     *

     */
    public function __construct()
    {
        parent::__construct();
        $this->middleware(
            function ($request, $next) {
                /** @var User $user */
                $user = auth()->user();

                $this->ruleRepository = app(RuleRepositoryInterface::class);
                $this->ruleRepository->setUser($user);

                return $next($request);
            }
        );
    }

    /**
     * This endpoint is documented at:
     * https://api-docs.firefly-iii.org/?urls.primaryName=2.0.0%20(v1)#/rules/validateExpression
     *
     * @param ValidateExpressionRequest $request
     *
     * @return JsonResponse
     */
    public function validateExpression(ValidateExpressionRequest $request): JsonResponse
    {
        $expr = $request->getExpression();
        $expressionLanguage = ExpressionLanguageFactory::get();
        $evaluator = new ActionExpressionEvaluator($expressionLanguage, $expr);

        try {
            $evaluator->lint();
            return response()->json([
                "valid" => true,
            ]);
        } catch (SyntaxError $e) {
            return response()->json([
                "valid" => false,
                "error" => $e->getMessage()
            ]);
        }
    }
}