<?php
/**
 * SelectController.php
 * Copyright (c) 2019 thegrumpydictator@gmail.com
 *
 * 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\Http\Controllers\Rule;


use Carbon\Carbon;
use FireflyIII\Exceptions\FireflyException;
use FireflyIII\Helpers\Collector\GroupCollectorInterface;
use FireflyIII\Http\Controllers\Controller;
use FireflyIII\Http\Requests\SelectTransactionsRequest;
use FireflyIII\Http\Requests\TestRuleFormRequest;
use FireflyIII\Jobs\ExecuteRuleOnExistingTransactions;
use FireflyIII\Models\Rule;
use FireflyIII\Repositories\Account\AccountRepositoryInterface;
use FireflyIII\Support\Http\Controllers\RequestInformation;
use FireflyIII\Support\Http\Controllers\RuleManagement;
use FireflyIII\TransactionRules\Engine\RuleEngine;
use FireflyIII\TransactionRules\TransactionMatcher;
use FireflyIII\User;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\RedirectResponse;
use Illuminate\Support\Collection;
use Log;
use Throwable;

/**
 * Class SelectController.
 *
 */
class SelectController extends Controller
{
    use RuleManagement, RequestInformation;
    /** @var AccountRepositoryInterface The account repository */
    private $accountRepos;

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

        $this->middleware(
            function ($request, $next) {
                app('view')->share('title', (string)trans('firefly.rules'));
                app('view')->share('mainTitleIcon', 'fa-random');

                $this->accountRepos = app(AccountRepositoryInterface::class);

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

    /**
     * Execute the given rule on a set of existing transactions.
     *
     * @param SelectTransactionsRequest $request
     * @param Rule $rule
     *
     * @return RedirectResponse
     */
    public function execute(SelectTransactionsRequest $request, Rule $rule): RedirectResponse
    {
        // Get parameters specified by the user
        /** @var User $user */
        $user      = auth()->user();
        $accounts  = $this->accountRepos->getAccountsById($request->get('accounts'));
        $startDate = new Carbon($request->get('start_date'));
        $endDate   = new Carbon($request->get('end_date'));
        $rules = [$rule->id];

        /** @var RuleEngine $ruleEngine */
        $ruleEngine = app(RuleEngine::class);
        $ruleEngine->setUser(auth()->user());
        $ruleEngine->setRulesToApply($rules);
        $ruleEngine->setTriggerMode(RuleEngine::TRIGGER_BOTH);

        /** @var GroupCollectorInterface $collector */
        $collector = app(GroupCollectorInterface::class);
        $collector->setAccounts($accounts);
        $collector->setRange($startDate, $endDate);
        $journals = $collector->getExtractedJournals();

        /** @var array $journal */
        foreach ($journals as $journal) {
            Log::debug('Start of new journal.');
            $ruleEngine->processJournalArray($journal);
            Log::debug('Done with all rules for this group + done with journal.');
        }

        // Tell the user that the job is queued
        session()->flash('success', (string)trans('firefly.applied_rule_selection', ['title' => $rule->title]));

        return redirect()->route('rules.index');
    }


    /**
     * View to select transactions by a rule.
     *
     * @param Rule $rule
     *
     * @return \Illuminate\Contracts\View\Factory|\Illuminate\View\View
     */
    public function selectTransactions(Rule $rule)
    {
        // does the user have shared accounts?
        $first    = session('first', Carbon::now()->subYear())->format('Y-m-d');
        $today    = Carbon::now()->format('Y-m-d');
        $subTitle = (string)trans('firefly.apply_rule_selection', ['title' => $rule->title]);

        return view('rules.rule.select-transactions', compact('first', 'today', 'rule', 'subTitle'));
    }

    /**
     * This method allows the user to test a certain set of rule triggers. The rule triggers are passed along
     * using the URL parameters (GET), and are usually put there using a Javascript thing.
     *
     * This method will parse and validate those rules and create a "TransactionMatcher" which will attempt
     * to find transaction journals matching the users input. A maximum range of transactions to try (range) and
     * a maximum number of transactions to return (limit) are set as well.
     *
     * @param TestRuleFormRequest $request
     *
     * @return JsonResponse
     *
     */
    public function testTriggers(TestRuleFormRequest $request): JsonResponse
    {
        // build trigger array from response
        $triggers = $this->getValidTriggerList($request);

        if (0 === count($triggers)) {
            return response()->json(['html' => '', 'warning' => (string)trans('firefly.warning_no_valid_triggers')]); // @codeCoverageIgnore
        }

        $limit                = (int)config('firefly.test-triggers.limit');
        $range                = (int)config('firefly.test-triggers.range');
        $matchingTransactions = new Collection;
        $strict               = '1' === $request->get('strict');
        /** @var TransactionMatcher $matcher */
        $matcher = app(TransactionMatcher::class);
        $matcher->setSearchLimit($range);
        $matcher->setTriggeredLimit($limit);
        $matcher->setTriggers($triggers);
        $matcher->setStrict($strict);
        try {
            $matchingTransactions = $matcher->findTransactionsByTriggers();
            // @codeCoverageIgnoreStart
        } catch (FireflyException $exception) {
            Log::error(sprintf('Could not grab transactions in testTriggers(): %s', $exception->getMessage()));
            Log::error($exception->getTraceAsString());
        }
        // @codeCoverageIgnoreStart


        // Warn the user if only a subset of transactions is returned
        $warning = '';
        if (count($matchingTransactions) === $limit) {
            $warning = (string)trans('firefly.warning_transaction_subset', ['max_num_transactions' => $limit]); // @codeCoverageIgnore
        }
        if (0 === count($matchingTransactions)) {
            $warning = (string)trans('firefly.warning_no_matching_transactions', ['num_transactions' => $range]); // @codeCoverageIgnore
        }

        // Return json response
        $view = 'ERROR, see logs.';
        try {
            $view = view('list.journals-array-tiny', ['journals' => $matchingTransactions])->render();
            // @codeCoverageIgnoreStart
        } catch (Throwable $exception) {
            Log::error(sprintf('Could not render view in testTriggers(): %s', $exception->getMessage()));
            Log::error($exception->getTraceAsString());
            $view = sprintf('Could not render list.journals-tiny: %s', $exception->getMessage());
        }

        // @codeCoverageIgnoreEnd

        return response()->json(['html' => $view, 'warning' => $warning]);
    }

    /**
     * This method allows the user to test a certain set of rule triggers. The rule triggers are grabbed from
     * the rule itself.
     *
     * This method will parse and validate those rules and create a "TransactionMatcher" which will attempt
     * to find transaction journals matching the users input. A maximum range of transactions to try (range) and
     * a maximum number of transactions to return (limit) are set as well.
     *
     * @param Rule $rule
     *
     * @return JsonResponse
     *
     */
    public function testTriggersByRule(Rule $rule): JsonResponse
    {
        $triggers = $rule->ruleTriggers;

        if (0 === count($triggers)) {
            return response()->json(['html' => '', 'warning' => (string)trans('firefly.warning_no_valid_triggers')]); // @codeCoverageIgnore
        }

        $limit                = (int)config('firefly.test-triggers.limit');
        $range                = (int)config('firefly.test-triggers.range');
        $matchingTransactions = new Collection;

        /** @var TransactionMatcher $matcher */
        $matcher = app(TransactionMatcher::class);
        $matcher->setTriggeredLimit($limit);
        $matcher->setSearchLimit($range);
        $matcher->setRule($rule);
        try {
            $matchingTransactions = $matcher->findTransactionsByRule();
            // @codeCoverageIgnoreStart
        } catch (FireflyException $exception) {
            Log::error(sprintf('Could not grab transactions in testTriggersByRule(): %s', $exception->getMessage()));
            Log::error($exception->getTraceAsString());
        }
        // @codeCoverageIgnoreEnd

        // Warn the user if only a subset of transactions is returned
        $warning = '';
        if (count($matchingTransactions) === $limit) {
            $warning = (string)trans('firefly.warning_transaction_subset', ['max_num_transactions' => $limit]); // @codeCoverageIgnore
        }
        if (0 === count($matchingTransactions)) {
            $warning = (string)trans('firefly.warning_no_matching_transactions', ['num_transactions' => $range]); // @codeCoverageIgnore
        }

        // Return json response
        $view = 'ERROR, see logs.';
        try {
            $view = view('list.journals-array-tiny', ['journals' => $matchingTransactions])->render();
            // @codeCoverageIgnoreStart
        } catch (Throwable $exception) {
            Log::error(sprintf('Could not render view in testTriggersByRule(): %s', $exception->getMessage()));
            Log::error($exception->getTraceAsString());
        }

        // @codeCoverageIgnoreEnd

        return response()->json(['html' => $view, 'warning' => $warning]);
    }


}