<?php
/**
 * AccountRepository.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\Repositories\Account;

use Carbon\Carbon;
use DB;
use FireflyIII\Factory\AccountFactory;
use FireflyIII\Models\Account;
use FireflyIII\Models\AccountType;
use FireflyIII\Models\Category;
use FireflyIII\Models\Note;
use FireflyIII\Models\Tag;
use FireflyIII\Models\Transaction;
use FireflyIII\Models\TransactionJournal;
use FireflyIII\Models\TransactionType;
use FireflyIII\Repositories\Tag\TagRepositoryInterface;
use FireflyIII\Services\Internal\Destroy\AccountDestroyService;
use FireflyIII\Services\Internal\Update\AccountUpdateService;
use FireflyIII\User;
use Log;

/**
 * Class AccountRepository.
 */
class AccountRepository implements AccountRepositoryInterface
{

    /** @var User */
    private $user;
    /** @var array */
    private $validAssetFields = ['accountRole', 'accountNumber', 'currency_id', 'BIC'];

    use FindAccountsTrait;
    /** @var array */
    private $validCCFields = ['accountRole', 'ccMonthlyPaymentDate', 'ccType', 'accountNumber', 'currency_id', 'BIC'];
    /** @var array */
    private $validFields = ['accountNumber', 'currency_id', 'BIC'];

    /**
     * Moved here from account CRUD.
     *
     * @param array $types
     *
     * @return int
     */
    public function count(array $types): int
    {
        $count = $this->user->accounts()->accountTypeIn($types)->count();

        return $count;
    }

    /**
     * Moved here from account CRUD.
     *
     * @param Account $account
     * @param Account $moveTo
     *
     * @return bool
     *
     * @throws \Exception
     */
    public function destroy(Account $account, Account $moveTo): bool
    {
        /** @var AccountDestroyService $service */
        $service = app(AccountDestroyService::class);
        $service->destroy($account, $moveTo);

        return true;
    }

    /**
     * @param int $accountId
     *
     * @return Account|null
     */
    public function findNull(int $accountId): ?Account
    {
        return $this->user->accounts()->find($accountId);
    }

    /**
     * Return account type by string.
     *
     * @param string $type
     *
     * @return AccountType|null
     */
    public function getAccountType(string $type): ?AccountType
    {
        return AccountType::whereType($type)->first();
    }

    /**
     * @param Account $account
     *
     * @return Note|null
     */
    public function getNote(Account $account): ?Note
    {
        return $account->notes()->first();
    }

    /**
     * Returns the amount of the opening balance for this account.
     *
     * @return string
     */
    public function getOpeningBalanceAmount(Account $account): ?string
    {

        $journal = TransactionJournal::leftJoin('transactions', 'transactions.transaction_journal_id', '=', 'transaction_journals.id')
                                     ->where('transactions.account_id', $account->id)
                                     ->transactionTypes([TransactionType::OPENING_BALANCE])
                                     ->first(['transaction_journals.*']);
        if (null === $journal) {
            return null;
        }
        $transaction = $journal->transactions()->where('account_id', $account->id)->first();
        if (null === $transaction) {
            return null;
        }

        return strval($transaction->amount);
    }

    /**
     * Return date of opening balance as string or null.
     *
     * @param Account $account
     *
     * @return null|string
     */
    public function getOpeningBalanceDate(Account $account): ?string
    {
        $journal = TransactionJournal::leftJoin('transactions', 'transactions.transaction_journal_id', '=', 'transaction_journals.id')
                                     ->where('transactions.account_id', $account->id)
                                     ->transactionTypes([TransactionType::OPENING_BALANCE])
                                     ->first(['transaction_journals.*']);
        if (null === $journal) {
            return null;
        }

        return $journal->date->format('Y-m-d');
    }

    /**
     * Returns the date of the very last transaction in this account.
     *
     * @param Account $account
     *
     * @return Carbon
     */
    public function newestJournalDate(Account $account): Carbon
    {
        $last = new Carbon;
        $date = $account->transactions()
                        ->leftJoin('transaction_journals', 'transaction_journals.id', '=', 'transactions.transaction_journal_id')
                        ->orderBy('transaction_journals.date', 'DESC')
                        ->orderBy('transaction_journals.order', 'ASC')
                        ->orderBy('transaction_journals.id', 'DESC')
                        ->first(['transaction_journals.date']);
        if (null !== $date) {
            $last = new Carbon($date->date);
        }

        return $last;
    }

    /**
     * Returns the date of the very first transaction in this account.
     *
     * @param Account $account
     *
     * @return TransactionJournal
     */
    public function oldestJournal(Account $account): TransactionJournal
    {
        $first = $account->transactions()
                         ->leftJoin('transaction_journals', 'transaction_journals.id', '=', 'transactions.transaction_journal_id')
                         ->orderBy('transaction_journals.date', 'ASC')
                         ->orderBy('transaction_journals.order', 'DESC')
                         ->where('transaction_journals.user_id', $this->user->id)
                         ->orderBy('transaction_journals.id', 'ASC')
                         ->first(['transaction_journals.id']);
        if (null !== $first) {
            return TransactionJournal::find(intval($first->id));
        }

        return new TransactionJournal();
    }

    /**
     * Returns the date of the very first transaction in this account.
     *
     * @param Account $account
     *
     * @return Carbon
     */
    public function oldestJournalDate(Account $account): Carbon
    {
        $journal = $this->oldestJournal($account);
        if (null === $journal->id) {
            return new Carbon;
        }

        return $journal->date;
    }

    /**
     * @param User $user
     */
    public function setUser(User $user)
    {
        $this->user = $user;
    }

    /**
     * @param array $data
     *
     * @return Account
     */
    public function store(array $data): Account
    {
        /** @var AccountFactory $factory */
        $factory = app(AccountFactory::class);
        $factory->setUser($this->user);
        $account = $factory->create($data);

        return $account;
    }

    /**
     * @param Account $account
     * @param array   $data
     *
     * @return Account
     */
    public function update(Account $account, array $data): Account
    {
        /** @var AccountUpdateService $service */
        $service = app(AccountUpdateService::class);
        $account = $service->update($account, $data);

        return $account;
    }

    /**
     * @param TransactionJournal $journal
     * @param array              $data
     *
     * @return TransactionJournal
     */
    public function updateReconciliation(TransactionJournal $journal, array $data): TransactionJournal
    {
        // update journal
        // update actual journal:
        $data['amount'] = strval($data['amount']);

        // unlink all categories, recreate them:
        $journal->categories()->detach();

        $this->storeCategoryWithJournal($journal, strval($data['category']));

        // update amounts
        /** @var Transaction $transaction */
        foreach ($journal->transactions as $transaction) {
            $transaction->amount = bcmul($data['amount'], '-1');
            if (AccountType::ASSET === $transaction->account->accountType->type) {
                $transaction->amount = $data['amount'];
            }
            $transaction->save();
        }

        $journal->save();

        // update tags:
        if (isset($data['tags']) && is_array($data['tags'])) {
            $this->updateTags($journal, $data['tags']);
        }

        return $journal;
    }

    /**
     * @param TransactionJournal $journal
     * @param string             $category
     */
    protected function storeCategoryWithJournal(TransactionJournal $journal, string $category)
    {
        if (strlen($category) > 0) {
            $category = Category::firstOrCreateEncrypted(['name' => $category, 'user_id' => $journal->user_id]);
            $journal->categories()->save($category);
        }
    }

    /**
     * @param TransactionJournal $journal
     * @param array              $array
     *
     * @return bool
     */
    protected function updateTags(TransactionJournal $journal, array $array): bool
    {
        // create tag repository
        /** @var TagRepositoryInterface $tagRepository */
        $tagRepository = app(TagRepositoryInterface::class);

        // find or create all tags:
        $tags = [];
        $ids  = [];
        foreach ($array as $name) {
            if (strlen(trim($name)) > 0) {
                $tag    = Tag::firstOrCreateEncrypted(['tag' => $name, 'user_id' => $journal->user_id]);
                $tags[] = $tag;
                $ids[]  = $tag->id;
            }
        }

        // delete all tags connected to journal not in this array:
        if (count($ids) > 0) {
            DB::table('tag_transaction_journal')->where('transaction_journal_id', $journal->id)->whereNotIn('tag_id', $ids)->delete();
        }
        // if count is zero, delete them all:
        if (0 === count($ids)) {
            DB::table('tag_transaction_journal')->where('transaction_journal_id', $journal->id)->delete();
        }

        // connect each tag to journal (if not yet connected):
        /** @var Tag $tag */
        foreach ($tags as $tag) {
            Log::debug(sprintf('Will try to connect tag #%d to journal #%d.', $tag->id, $journal->id));
            $tagRepository->connect($journal, $tag);
        }

        return true;
    }

}