<?php
/**
 * AccountController.php
 * Copyright (c) 2017 thegrumpydictator@gmail.com
 *
 * This file is part of Firefly III.
 *
 * Firefly III is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Firefly III 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Firefly III. If not, see <http://www.gnu.org/licenses/>.
 */
declare(strict_types=1);

namespace FireflyIII\Http\Controllers;

use Carbon\Carbon;
use ExpandedForm;
use FireflyIII\Exceptions\FireflyException;
use FireflyIII\Helpers\Collector\JournalCollectorInterface;
use FireflyIII\Http\Requests\AccountFormRequest;
use FireflyIII\Models\Account;
use FireflyIII\Models\AccountType;
use FireflyIII\Models\Note;
use FireflyIII\Models\Transaction;
use FireflyIII\Models\TransactionType;
use FireflyIII\Repositories\Account\AccountRepositoryInterface;
use FireflyIII\Repositories\Currency\CurrencyRepositoryInterface;
use FireflyIII\Repositories\Journal\JournalRepositoryInterface;
use FireflyIII\Support\CacheProperties;
use Illuminate\Http\Request;
use Illuminate\Pagination\LengthAwarePaginator;
use Illuminate\Support\Collection;
use Preferences;
use Steam;
use View;

/**
 * Class AccountController.
 *
 * @SuppressWarnings(PHPMD.CouplingBetweenObjects)
 */
class AccountController extends Controller
{
    /** @var CurrencyRepositoryInterface */
    private $currencyRepos;
    /** @var JournalRepositoryInterface */
    private $journalRepos;
    /** @var AccountRepositoryInterface */
    private $repository;

    /**
     *
     */
    public function __construct()
    {
        parent::__construct();

        // translations:
        $this->middleware(
            function ($request, $next) {
                app('view')->share('mainTitleIcon', 'fa-credit-card');
                app('view')->share('title', trans('firefly.accounts'));

                $this->repository    = app(AccountRepositoryInterface::class);
                $this->currencyRepos = app(CurrencyRepositoryInterface::class);
                $this->journalRepos  = app(JournalRepositoryInterface::class);

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

    /**
     * @param Request $request
     * @param string  $what
     *
     * @return View
     */
    public function create(Request $request, string $what = 'asset')
    {
        $defaultCurrency = app('amount')->getDefaultCurrency();
        $subTitleIcon    = config('firefly.subIconsByIdentifier.' . $what);
        $subTitle        = trans('firefly.make_new_' . $what . '_account');
        $roles           = [];
        foreach (config('firefly.accountRoles') as $role) {
            $roles[$role] = (string)trans('firefly.account_role_' . $role);
        }

        // pre fill some data
        $request->session()->flash('preFilled', ['currency_id' => $defaultCurrency->id]);

        // put previous url in session if not redirect from store (not "create another").
        if (true !== session('accounts.create.fromStore')) {
            $this->rememberPreviousUri('accounts.create.uri');
        }
        $request->session()->forget('accounts.create.fromStore');

        return view('accounts.create', compact('subTitleIcon', 'what', 'subTitle', 'roles'));
    }

    /**
     * @param Account $account
     *
     * @return View
     */
    public function delete(Account $account)
    {
        $typeName    = config('firefly.shortNamesByFullName.' . $account->accountType->type);
        $subTitle    = trans('firefly.delete_' . $typeName . '_account', ['name' => $account->name]);
        $accountList = ExpandedForm::makeSelectListWithEmpty($this->repository->getAccountsByType([$account->accountType->type]));
        unset($accountList[$account->id]);

        // put previous url in session
        $this->rememberPreviousUri('accounts.delete.uri');

        return view('accounts.delete', compact('account', 'subTitle', 'accountList'));
    }

    /**
     * @param Request $request
     * @param Account $account
     *
     * @return \Illuminate\Http\RedirectResponse|\Illuminate\Routing\Redirector
     */
    public function destroy(Request $request, Account $account)
    {
        $type     = $account->accountType->type;
        $typeName = config('firefly.shortNamesByFullName.' . $type);
        $name     = $account->name;
        $moveTo   = $this->repository->findNull((int)$request->get('move_account_before_delete'));

        $this->repository->destroy($account, $moveTo);

        $request->session()->flash('success', (string)trans('firefly.' . $typeName . '_deleted', ['name' => $name]));
        Preferences::mark();

        return redirect($this->getPreviousUri('accounts.delete.uri'));
    }

    /**
     * Edit an account.
     *
     * @param Request                    $request
     * @param Account                    $account
     *
     * @param AccountRepositoryInterface $repository
     *
     * @return View
     *
     * @SuppressWarnings(PHPMD.CyclomaticComplexity) // long and complex but not that excessively so.
     * @SuppressWarnings(PHPMD.ExcessiveMethodLength)
     *

     */
    public function edit(Request $request, Account $account, AccountRepositoryInterface $repository)
    {
        $what         = config('firefly.shortNamesByFullName')[$account->accountType->type];
        $subTitle     = trans('firefly.edit_' . $what . '_account', ['name' => $account->name]);
        $subTitleIcon = config('firefly.subIconsByIdentifier.' . $what);
        $roles        = [];
        foreach (config('firefly.accountRoles') as $role) {
            $roles[$role] = (string)trans('firefly.account_role_' . $role);
        }

        // put previous url in session if not redirect from store (not "return_to_edit").
        if (true !== session('accounts.edit.fromUpdate')) {
            $this->rememberPreviousUri('accounts.edit.uri');
        }
        $request->session()->forget('accounts.edit.fromUpdate');

        // pre fill some useful values.

        // the opening balance is tricky:
        $openingBalanceAmount = (string)$repository->getOpeningBalanceAmount($account);
        $openingBalanceDate   = $repository->getOpeningBalanceDate($account);
        $default              = app('amount')->getDefaultCurrency();
        $currency             = $this->currencyRepos->findNull((int)$repository->getMetaValue($account, 'currency_id'));
        if (null === $currency) {
            $currency = $default;
        }

        $preFilled = [
            'accountNumber'        => $repository->getMetaValue($account, 'accountNumber'),
            'accountRole'          => $repository->getMetaValue($account, 'accountRole'),
            'ccType'               => $repository->getMetaValue($account, 'ccType'),
            'ccMonthlyPaymentDate' => $repository->getMetaValue($account, 'ccMonthlyPaymentDate'),
            'BIC'                  => $repository->getMetaValue($account, 'BIC'),
            'openingBalanceDate'   => $openingBalanceDate,
            'openingBalance'       => $openingBalanceAmount,
            'virtualBalance'       => $account->virtual_balance,
            'currency_id'          => $currency->id,
            'notes'                => '',
            'active'               => $account->active,
        ];
        /** @var Note $note */
        $note = $this->repository->getNote($account);
        if (null !== $note) {
            $preFilled['notes'] = $note->text;
        }


        $request->session()->flash('preFilled', $preFilled);

        return view('accounts.edit', compact('account', 'currency', 'subTitle', 'subTitleIcon', 'what', 'roles', 'preFilled'));
    }

    /**
     * @param Request $request
     * @param string  $what
     *
     * @return View
     */
    public function index(Request $request, string $what)
    {
        $what         = $what ?? 'asset';
        $subTitle     = trans('firefly.' . $what . '_accounts');
        $subTitleIcon = config('firefly.subIconsByIdentifier.' . $what);
        $types        = config('firefly.accountTypesByIdentifier.' . $what);
        $collection   = $this->repository->getAccountsByType($types);
        $total        = $collection->count();
        $page         = 0 === (int)$request->get('page') ? 1 : (int)$request->get('page');
        $pageSize     = (int)Preferences::get('listPageSize', 50)->data;
        $accounts     = $collection->slice(($page - 1) * $pageSize, $pageSize);
        unset($collection);
        /** @var Carbon $start */
        $start = clone session('start', Carbon::now()->startOfMonth());
        /** @var Carbon $end */
        $end = clone session('end', Carbon::now()->endOfMonth());
        $start->subDay();

        $ids           = $accounts->pluck('id')->toArray();
        $startBalances = Steam::balancesByAccounts($accounts, $start);
        $endBalances   = Steam::balancesByAccounts($accounts, $end);
        $activities    = Steam::getLastActivities($ids);

        $accounts->each(
            function (Account $account) use ($activities, $startBalances, $endBalances) {
                $account->lastActivityDate = $this->isInArray($activities, $account->id);
                $account->startBalance     = $this->isInArray($startBalances, $account->id);
                $account->endBalance       = $this->isInArray($endBalances, $account->id);
                $account->difference       = bcsub($account->endBalance, $account->startBalance);
            }
        );

        // make paginator:
        $accounts = new LengthAwarePaginator($accounts, $total, $pageSize, $page);
        $accounts->setPath(route('accounts.index', [$what]));

        return view('accounts.index', compact('what', 'subTitleIcon', 'subTitle', 'page', 'accounts'));
    }

    /**
     * Show an account.
     *
     * @param Request     $request
     * @param Account     $account
     * @param Carbon|null $start
     * @param Carbon|null $end
     *
     * @return \Illuminate\Http\RedirectResponse|\Illuminate\Routing\Redirector|View
     *
     * @throws FireflyException
     *
     */
    public function show(Request $request, Account $account, Carbon $start = null, Carbon $end = null)
    {
        if (AccountType::INITIAL_BALANCE === $account->accountType->type) {
            return $this->redirectToOriginalAccount($account);
        }
        if (null === $start) {
            $start = session('start');
        }
        if (null === $end) {
            $end = session('end');
        }
        if ($end < $start) {
            throw new FireflyException('End is after start!'); // @codeCoverageIgnore
        }


        $what         = config(sprintf('firefly.shortNamesByFullName.%s', $account->accountType->type)); // used for menu
        $today        = new Carbon;
        $subTitleIcon = config(sprintf('firefly.subIconsByIdentifier.%s', $account->accountType->type));
        $page         = (int)$request->get('page');
        $pageSize     = (int)Preferences::get('listPageSize', 50)->data;
        $currencyId   = (int)$this->repository->getMetaValue($account, 'currency_id');
        $currency     = $this->currencyRepos->findNull($currencyId);
        if (0 === $currencyId) {
            $currency = app('amount')->getDefaultCurrency(); // @codeCoverageIgnore
        }
        $fStart    = $start->formatLocalized($this->monthAndDayFormat);
        $fEnd      = $end->formatLocalized($this->monthAndDayFormat);
        $subTitle  = trans('firefly.journals_in_period_for_account', ['name' => $account->name, 'start' => $fStart, 'end' => $fEnd]);
        $chartUri  = route('chart.account.period', [$account->id, $start->format('Y-m-d'), $end->format('Y-m-d')]);
        $periods   = $this->getPeriodOverview($account, $end);
        $collector = app(JournalCollectorInterface::class);
        $collector->setAccounts(new Collection([$account]))->setLimit($pageSize)->setPage($page);
        $collector->setRange($start, $end);
        $transactions = $collector->getPaginatedJournals();
        $transactions->setPath(route('accounts.show', [$account->id, $start->format('Y-m-d'), $end->format('Y-m-d')]));
        $showAll = false;

        return view(
            'accounts.show',
            compact('account', 'showAll', 'what', 'currency', 'today', 'periods', 'subTitleIcon', 'transactions', 'subTitle', 'start', 'end', 'chartUri')
        );
    }

    /**
     * Show an account.
     *
     * @param Request $request
     * @param Account $account
     *
     * @return \Illuminate\Http\RedirectResponse|\Illuminate\Routing\Redirector|View
     *
     * @throws FireflyException
     *
     */
    public function showAll(Request $request, Account $account)
    {
        if (AccountType::INITIAL_BALANCE === $account->accountType->type) {
            return $this->redirectToOriginalAccount($account); // @codeCoverageIgnore
        }
        $end          = new Carbon;
        $today        = new Carbon;
        $start        = $this->repository->oldestJournalDate($account);
        $subTitleIcon = config('firefly.subIconsByIdentifier.' . $account->accountType->type);
        $page         = (int)$request->get('page');
        $pageSize     = (int)Preferences::get('listPageSize', 50)->data;
        $currencyId   = (int)$this->repository->getMetaValue($account, 'currency_id');
        $currency     = $this->currencyRepos->findNull($currencyId);
        if (0 === $currencyId) {
            $currency = app('amount')->getDefaultCurrency(); // @codeCoverageIgnore
        }
        $subTitle  = trans('firefly.all_journals_for_account', ['name' => $account->name]);
        $periods   = new Collection;
        $collector = app(JournalCollectorInterface::class);
        $collector->setAccounts(new Collection([$account]))->setLimit($pageSize)->setPage($page);
        $transactions = $collector->getPaginatedJournals();
        $transactions->setPath(route('accounts.show.all', [$account->id]));
        $chartUri = route('chart.account.period', [$account->id, $start->format('Y-m-d'), $end->format('Y-m-d')]);
        $showAll  = true;

        return view(
            'accounts.show',
            compact('account', 'showAll', 'currency', 'today', 'chartUri', 'periods', 'subTitleIcon', 'transactions', 'subTitle', 'start', 'end')
        );
    }

    /**
     * @param AccountFormRequest $request
     *
     * @return \Illuminate\Http\RedirectResponse|\Illuminate\Routing\Redirector
     */
    public function store(AccountFormRequest $request)
    {
        $data    = $request->getAccountData();
        $account = $this->repository->store($data);
        $request->session()->flash('success', (string)trans('firefly.stored_new_account', ['name' => $account->name]));
        Preferences::mark();

        // update preferences if necessary:
        $frontPage = Preferences::get('frontPageAccounts', [])->data;
        if (AccountType::ASSET === $account->accountType->type && \count($frontPage) > 0) {
            // @codeCoverageIgnoreStart
            $frontPage[] = $account->id;
            Preferences::set('frontPageAccounts', $frontPage);
            // @codeCoverageIgnoreEnd
        }

        if (1 === (int)$request->get('create_another')) {
            // set value so create routine will not overwrite URL:
            $request->session()->put('accounts.create.fromStore', true);

            return redirect(route('accounts.create', [$request->input('what')]))->withInput();
        }

        // redirect to previous URL.
        return redirect($this->getPreviousUri('accounts.create.uri'));
    }

    /**
     * @param AccountFormRequest $request
     * @param Account            $account
     *
     * @return $this|\Illuminate\Http\RedirectResponse|\Illuminate\Routing\Redirector
     */
    public function update(AccountFormRequest $request, Account $account)
    {
        $data = $request->getAccountData();
        $this->repository->update($account, $data);

        $request->session()->flash('success', (string)trans('firefly.updated_account', ['name' => $account->name]));
        Preferences::mark();

        if (1 === (int)$request->get('return_to_edit')) {
            // set value so edit routine will not overwrite URL:
            $request->session()->put('accounts.edit.fromUpdate', true);

            return redirect(route('accounts.edit', [$account->id]))->withInput(['return_to_edit' => 1]);
        }

        // redirect to previous URL.
        return redirect($this->getPreviousUri('accounts.edit.uri'));
    }

    /**
     * @param array $array
     * @param int   $entryId
     *
     * @return null|mixed
     */
    protected function isInArray(array $array, int $entryId)
    {
        if (isset($array[$entryId])) {
            return $array[$entryId];
        }

        return '0';
    }

    /**
     * This method returns "period entries", so nov-2015, dec-2015, etc etc (this depends on the users session range)
     * and for each period, the amount of money spent and earned. This is a complex operation which is cached for
     * performance reasons.
     *
     * @param Account     $account the account involved
     *
     * @param Carbon|null $date
     *
     * @return Collection
     *
     * @SuppressWarnings(PHPMD.ExcessiveMethodLength)
     */
    private function getPeriodOverview(Account $account, ?Carbon $date): Collection
    {
        $range = Preferences::get('viewRange', '1M')->data;
        $start = $this->repository->oldestJournalDate($account);
        $end   = $date ?? new Carbon;
        if ($end < $start) {
            [$start, $end] = [$end, $start]; // @codeCoverageIgnore
        }

        // properties for cache
        $cache = new CacheProperties;
        $cache->addProperty($start);
        $cache->addProperty($end);
        $cache->addProperty('account-show-period-entries');
        $cache->addProperty($account->id);
        if ($cache->has()) {
            return $cache->get(); // @codeCoverageIgnore
        }
        /** @var array $dates */
        $dates   = app('navigation')->blockPeriods($start, $end, $range);
        $entries = new Collection;
        // loop dates
        foreach ($dates as $currentDate) {

            // try a collector for income:
            /** @var JournalCollectorInterface $collector */
            $collector = app(JournalCollectorInterface::class);
            $collector->setAccounts(new Collection([$account]))->setRange($currentDate['start'], $currentDate['end'])->setTypes([TransactionType::DEPOSIT])
                      ->withOpposingAccount();
            $earned = (string)$collector->getJournals()->sum('transaction_amount');

            // try a collector for expenses:
            /** @var JournalCollectorInterface $collector */
            $collector = app(JournalCollectorInterface::class);
            $collector->setAccounts(new Collection([$account]))->setRange($currentDate['start'], $currentDate['end'])->setTypes([TransactionType::WITHDRAWAL])
                      ->withOpposingAccount();
            $spent = (string)$collector->getJournals()->sum('transaction_amount');

            $dateName = app('navigation')->periodShow($currentDate['start'], $currentDate['period']);
            $entries->push(
                [
                    'name'   => $dateName,
                    'spent'  => $spent,
                    'earned' => $earned,
                    'start'  => $currentDate['start']->format('Y-m-d'),
                    'end'    => $currentDate['end']->format('Y-m-d'),
                ]
            );
        }

        $cache->store($entries);

        return $entries;
    }

    /**
     * @param Account $account
     *
     * @return \Illuminate\Http\RedirectResponse|\Illuminate\Routing\Redirector
     *
     * @throws FireflyException
     */
    private function redirectToOriginalAccount(Account $account)
    {
        /** @var Transaction $transaction */
        $transaction = $account->transactions()->first();
        if (null === $transaction) {
            throw new FireflyException('Expected a transaction. This account has none. BEEP, error.');
        }

        $journal = $transaction->transactionJournal;
        /** @var Transaction $opposingTransaction */
        $opposingTransaction = $journal->transactions()->where('transactions.id', '!=', $transaction->id)->first();

        if (null === $opposingTransaction) {
            throw new FireflyException('Expected an opposing transaction. This account has none. BEEP, error.'); // @codeCoverageIgnore
        }

        return redirect(route('accounts.show', [$opposingTransaction->account_id]));
    }
}