<?php
/**
 * ConvertController.php
 * Copyright (C) 2016 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\Http\Controllers\Transaction;

use ExpandedForm;
use FireflyIII\Exceptions\FireflyException;
use FireflyIII\Http\Controllers\Controller;
use FireflyIII\Models\Account;
use FireflyIII\Models\AccountType;
use FireflyIII\Models\TransactionJournal;
use FireflyIII\Models\TransactionType;
use FireflyIII\Repositories\Account\AccountRepositoryInterface;
use FireflyIII\Repositories\Journal\JournalRepositoryInterface;
use Illuminate\Http\Request;
use Session;
use View;

/**
 * Class ConvertController
 *
 * @package FireflyIII\Http\Controllers\Transaction
 */
class ConvertController extends Controller
{
    /** @var  AccountRepositoryInterface */
    private $accounts;

    /**
     * ConvertController constructor.
     */
    public function __construct()
    {
        parent::__construct();

        // some useful repositories:
        $this->middleware(
            function ($request, $next) {
                $this->accounts = app(AccountRepositoryInterface::class);

                View::share('title', trans('firefly.transactions'));
                View::share('mainTitleIcon', 'fa-exchange');

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

    /**
     * @param TransactionType    $destinationType
     * @param TransactionJournal $journal
     *
     * @return \Illuminate\Http\RedirectResponse|\Illuminate\Routing\Redirector|View
     */
    public function index(TransactionType $destinationType, TransactionJournal $journal)
    {
        // @codeCoverageIgnoreStart
        if ($this->isOpeningBalance($journal)) {
            return $this->redirectToAccount($journal);
        }
        // @codeCoverageIgnoreEnd

        $positiveAmount = $journal->amountPositive();
        $assetAccounts  = ExpandedForm::makeSelectList($this->accounts->getActiveAccountsByType([AccountType::DEFAULT, AccountType::ASSET]));
        $sourceType     = $journal->transactionType;
        $subTitle       = trans('firefly.convert_to_' . $destinationType->type, ['description' => $journal->description]);
        $subTitleIcon   = 'fa-exchange';

        // cannot convert to its own type.
        if ($sourceType->type === $destinationType->type) {
            Session::flash('info', trans('firefly.convert_is_already_type_' . $destinationType->type));

            return redirect(route('transactions.show', [$journal->id]));
        }

        // cannot convert split.
        if ($journal->transactions()->count() > 2) {
            Session::flash('error', trans('firefly.cannot_convert_split_journl'));

            return redirect(route('transactions.show', [$journal->id]));
        }

        // get source and destination account:
        $sourceAccount      = $journal->sourceAccountList()->first();
        $destinationAccount = $journal->destinationAccountList()->first();

        return view(
            'transactions.convert',
            compact(
                'sourceType', 'destinationType', 'journal', 'assetAccounts',
                'positiveAmount', 'sourceAccount', 'destinationAccount', 'sourceType',
                'subTitle', 'subTitleIcon'

            )
        );


        // convert withdrawal to deposit requires a new source account ()
        //  or to transfer requires
    }

    /**
     * @param Request                    $request
     * @param JournalRepositoryInterface $repository
     * @param TransactionType            $destinationType
     * @param TransactionJournal         $journal
     *
     * @return \Illuminate\Http\RedirectResponse|\Illuminate\Routing\Redirector
     */
    public function postIndex(Request $request, JournalRepositoryInterface $repository, TransactionType $destinationType, TransactionJournal $journal)
    {
        if ($this->isOpeningBalance($journal)) {
            return $this->redirectToAccount($journal);
        }

        $data = $request->all();

        // cannot convert to its own type.
        if ($journal->transactionType->type === $destinationType->type) {
            Session::flash('error', trans('firefly.convert_is_already_type_' . $destinationType->type));

            return redirect(route('transactions.show', [$journal->id]));
        }

        // cannot convert split.
        if ($journal->transactions()->count() > 2) {
            Session::flash('error', trans('firefly.cannot_convert_split_journl'));

            return redirect(route('transactions.show', [$journal->id]));
        }

        // get the new source and destination account:
        $source      = $this->getSourceAccount($journal, $destinationType, $data);
        $destination = $this->getDestinationAccount($journal, $destinationType, $data);

        // update the journal:
        $errors = $repository->convert($journal, $destinationType, $source, $destination);

        if ($errors->count() > 0) {
            return redirect(route('transactions.convert.index', [strtolower($destinationType->type), $journal->id]))->withErrors($errors)->withInput();
        }

        Session::flash('success', trans('firefly.converted_to_' . $destinationType->type));

        return redirect(route('transactions.show', [$journal->id]));
    }

    /**
     * @param TransactionJournal $journal
     * @param TransactionType    $destinationType
     * @param array              $data
     *
     * @return Account
     * @throws FireflyException
     */
    private function getDestinationAccount(TransactionJournal $journal, TransactionType $destinationType, array $data): Account
    {
        /** @var AccountRepositoryInterface $accountRepository */
        $accountRepository  = app(AccountRepositoryInterface::class);
        $sourceAccount      = $journal->sourceAccountList()->first();
        $destinationAccount = $journal->destinationAccountList()->first();
        $sourceType         = $journal->transactionType;
        $joined             = $sourceType->type . '-' . $destinationType->type;
        switch ($joined) {
            default:
                throw new FireflyException('Cannot handle ' . $joined);
            case TransactionType::WITHDRAWAL . '-' . TransactionType::DEPOSIT: // one
                $destination = $sourceAccount;
                break;
            case TransactionType::WITHDRAWAL . '-' . TransactionType::TRANSFER: // two
                $destination = $accountRepository->find(intval($data['destination_account_asset']));
                break;
            case TransactionType::DEPOSIT . '-' . TransactionType::WITHDRAWAL: // three
            case TransactionType::TRANSFER . '-' . TransactionType::WITHDRAWAL: // five
                $data        = [
                    'name'           => $data['destination_account_expense'],
                    'accountType'    => 'expense',
                    'virtualBalance' => 0,
                    'active'         => true,
                    'iban'           => null,
                ];
                $destination = $accountRepository->store($data);
                break;
            case TransactionType::DEPOSIT . '-' . TransactionType::TRANSFER: // four
            case TransactionType::TRANSFER . '-' . TransactionType::DEPOSIT: // six
                $destination = $destinationAccount;
                break;
        }

        return $destination;
    }

    /**
     * @param TransactionJournal $journal
     * @param TransactionType    $destinationType
     * @param array              $data
     *
     * @return Account
     * @throws FireflyException
     */
    private function getSourceAccount(TransactionJournal $journal, TransactionType $destinationType, array $data): Account
    {
        /** @var AccountRepositoryInterface $accountRepository */
        $accountRepository  = app(AccountRepositoryInterface::class);
        $sourceAccount      = $journal->sourceAccountList()->first();
        $destinationAccount = $journal->destinationAccountList()->first();
        $sourceType         = $journal->transactionType;
        $joined             = $sourceType->type . '-' . $destinationType->type;
        switch ($joined) {
            default:
                throw new FireflyException('Cannot handle ' . $joined);
            case TransactionType::WITHDRAWAL . '-' . TransactionType::DEPOSIT: // one
            case TransactionType::TRANSFER . '-' . TransactionType::DEPOSIT: // six
                $data   = [
                    'name'           => $data['source_account_revenue'],
                    'accountType'    => 'revenue',
                    'virtualBalance' => 0,
                    'active'         => true,
                    'iban'           => null,
                ];
                $source = $accountRepository->store($data);
                break;
            case TransactionType::WITHDRAWAL . '-' . TransactionType::TRANSFER: // two
            case TransactionType::TRANSFER . '-' . TransactionType::WITHDRAWAL: // five
                $source = $sourceAccount;
                break;
            case TransactionType::DEPOSIT . '-' . TransactionType::WITHDRAWAL: // three
                $source = $destinationAccount;
                break;
            case TransactionType::DEPOSIT . '-' . TransactionType::TRANSFER: // four
                $source = $accountRepository->find(intval($data['source_account_asset']));
                break;
        }

        return $source;

    }

}