<?php
/**
 * ImportStorage.php
 * Copyright (c) 2017 thegrumpydictator@gmail.com
 * This software may be modified and distributed under the terms of the Creative Commons Attribution-ShareAlike 4.0 International License.
 *
 * See the LICENSE file for details.
 */

declare(strict_types=1);

namespace FireflyIII\Import\Storage;

use ErrorException;
use Exception;
use FireflyIII\Exceptions\FireflyException;
use FireflyIII\Import\Object\ImportJournal;
use FireflyIII\Models\ImportJob;
use FireflyIII\Models\TransactionType;
use Illuminate\Support\Collection;
use Log;

/**
 * Is capable of storing individual ImportJournal objects.
 * Class ImportStorage
 *
 * @package FireflyIII\Import\Storage
 */
class ImportStorage
{
    use ImportSupport;

    /** @var  Collection */
    public $errors;
    /** @var Collection */
    public $journals;
    /** @var  int */
    protected $defaultCurrencyId = 1;
    /** @var string */
    private $dateFormat = 'Ymd'; // yes, hard coded
    /** @var  ImportJob */
    private $job;
    /** @var Collection */
    private $objects;
    /** @var Collection */
    private $rules;

    /** @var  array */
    private $transfers = [];

    /**
     * ImportStorage constructor.
     */
    public function __construct()
    {
        $this->objects  = new Collection;
        $this->journals = new Collection;
        $this->errors   = new Collection;
    }

    /**
     * @param string $dateFormat
     */
    public function setDateFormat(string $dateFormat)
    {
        $this->dateFormat = $dateFormat;
    }

    /**
     * @param ImportJob $job
     */
    public function setJob(ImportJob $job)
    {
        $this->job               = $job;
        $currency                = app('amount')->getDefaultCurrencyByUser($this->job->user);
        $this->defaultCurrencyId = $currency->id;
        $this->transfers         = $this->getTransfers();
        $this->rules             = $this->getRules();
    }

    /**
     * @param Collection $objects
     */
    public function setObjects(Collection $objects)
    {
        $this->objects = $objects;
    }

    /**
     * Do storage of import objects. Is the main function.
     *
     * @return bool
     */
    public function store(): bool
    {
        $this->objects->each(
            function (ImportJournal $importJournal, int $index) {
                try {
                    $this->storeImportJournal($index, $importJournal);
                } catch (FireflyException | ErrorException | Exception $e) {
                    $this->errors->push($e->getMessage());
                    Log::error(sprintf('Cannot import row #%d because: %s', $index, $e->getMessage()));
                }
            }
        );
        Log::info('ImportStorage has finished.');

        return true;
    }

    /**
     * @param int           $index
     * @param ImportJournal $importJournal
     *
     * @return bool
     * @throws FireflyException
     */
    protected function storeImportJournal(int $index, ImportJournal $importJournal): bool
    {
        Log::debug(sprintf('Going to store object #%d with description "%s"', $index, $importJournal->getDescription()));
        $assetAccount      = $importJournal->asset->getAccount();
        $amount            = $importJournal->getAmount();
        $currencyId        = $this->getCurrencyId($importJournal);
        $foreignCurrencyId = $this->getForeignCurrencyId($importJournal, $currencyId);
        $date              = $importJournal->getDate($this->dateFormat)->format('Y-m-d');
        $opposingAccount   = $this->getOpposingAccount($importJournal->opposing, $assetAccount->id, $amount);
        $transactionType   = $this->getTransactionType($amount, $opposingAccount);
        $description       = $importJournal->getDescription();

        /*** First step done! */
        $this->job->addStepsDone(1);

        /**
         * Check for double transfer.
         */
        $parameters = [
            'type'        => $transactionType,
            'description' => $description,
            'amount'      => $amount,
            'date'        => $date,
            'asset'       => $assetAccount->name,
            'opposing'    => $opposingAccount->name,
        ];
        if ($this->isDoubleTransfer($parameters) || $this->hashAlreadyImported($importJournal->hash)) {
            $this->job->addStepsDone(3);
            // throw error
            throw new FireflyException('Detected a possible duplicate, skip this one.');
        }
        unset($parameters);

        // store journal and create transactions:
        $parameters = [
            'type'             => $transactionType,
            'currency'         => $currencyId,
            'foreign_currency' => $foreignCurrencyId,
            'asset'            => $assetAccount,
            'opposing'         => $opposingAccount,
            'description'      => $description,
            'date'             => $date,
            'hash'             => $importJournal->hash,
            'amount'           => $amount,

        ];
        $journal    = $this->storeJournal($parameters);
        unset($parameters);

        /*** Another step done! */
        $this->job->addStepsDone(1);

        // store meta object things:
        $this->storeCategory($journal, $importJournal->category->getCategory());
        $this->storeBudget($journal, $importJournal->budget->getBudget());
        $this->storeBill($journal, $importJournal->bill->getBill());
        $this->storeMeta($journal, $importJournal->metaDates);
        $journal->setMeta('notes', $importJournal->notes);
        $this->storeTags($importJournal->tags, $journal);

        // set journal completed:
        $journal->completed = true;
        $journal->save();

        /*** Another step done! */
        $this->job->addStepsDone(1);

        // run rules:
        $this->applyRules($journal);
        /*** Another step done! */
        $this->job->addStepsDone(1);
        $this->journals->push($journal);

        Log::info(sprintf('Imported new journal #%d: "%s", amount %s %s.', $journal->id, $journal->description, $journal->transactionCurrency->code, $amount));

        return true;
    }

    /**
     * @param array $parameters
     *
     * @return bool
     */
    private function isDoubleTransfer(array $parameters): bool
    {
        if ($parameters['type'] !== TransactionType::TRANSFER) {
            return false;
        }

        $amount   = app('steam')->positive($parameters['amount']);
        $names    = [$parameters['asset'], $parameters['opposing']];
        $transfer = [];
        sort($names);

        foreach ($this->transfers as $transfer) {
            if ($parameters['description'] !== $transfer['description']) {
                return false;
            }
            if ($names !== $transfer['names']) {
                return false;
            }
            if (bccomp($amount, $transfer['amount']) !== 0) {
                return false;
            }
            if ($parameters['date'] !== $transfer['date']) {
                return false;
            }
        }
        Log::debug('There already is a transfer imported with these properties. Compare existing with new. ', ['existing' => $transfer, 'new' => $parameters]);

        return true;
    }
}