firefly-iii/app/Api/V1/Controllers/Insight/Expense/PeriodController.php

<?php
/*
 * PeriodController.php
 * Copyright (c) 2021 james@firefly-iii.org
 *
 * 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\Insight\Expense;

use FireflyIII\Api\V1\Controllers\Controller;
use FireflyIII\Api\V1\Requests\Insight\GenericRequest;
use FireflyIII\Helpers\Collector\GroupCollectorInterface;
use FireflyIII\Models\TransactionType;
use Illuminate\Http\JsonResponse;

/**
 * Class PeriodController
 */
class PeriodController extends Controller
{

    /**
     * This endpoint is documented at:
     * https://api-docs.firefly-iii.org/#/insight/insightExpenseTotal
     *
     * @param GenericRequest $request
     *
     * @return JsonResponse
     */
    public function total(GenericRequest $request): JsonResponse
    {
        $accounts = $request->getAssetAccounts();
        $start    = $request->getStart();
        $end      = $request->getEnd();
        $response = [];

        // collect all expenses in this period (regardless of type)
        $collector = app(GroupCollectorInterface::class);
        $collector->setTypes([TransactionType::WITHDRAWAL])->setRange($start, $end)->setSourceAccounts($accounts);
        $genericSet = $collector->getExtractedJournals();
        foreach ($genericSet as $journal) {
            $currencyId        = (int) $journal['currency_id'];
            $foreignCurrencyId = (int) $journal['foreign_currency_id'];

            if (0 !== $currencyId) {
                $response[$currencyId]                     = $response[$currencyId] ?? [
                        'difference'       => '0',
                        'difference_float' => 0,
                        'currency_id'      => (string) $currencyId,
                        'currency_code'    => $journal['currency_code'],
                    ];
                $response[$currencyId]['difference']       = bcadd($response[$currencyId]['difference'], $journal['amount']);
                $response[$currencyId]['difference_float'] = (float) $response[$currencyId]['difference']; // float but on purpose.
            }
            if (0 !== $foreignCurrencyId) {
                $response[$foreignCurrencyId]                     = $response[$foreignCurrencyId] ?? [
                        'difference'       => '0',
                        'difference_float' => 0,
                        'currency_id'      => (string) $foreignCurrencyId,
                        'currency_code'    => $journal['foreign_currency_code'],
                    ];
                $response[$foreignCurrencyId]['difference']       = bcadd($response[$foreignCurrencyId]['difference'], $journal['foreign_amount']);
                $response[$foreignCurrencyId]['difference_float'] = (float) $response[$foreignCurrencyId]['difference']; // float but on purpose.
            }
        }

        return response()->json(array_values($response));
    }

}