<?php
/**
 * BudgetController.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;

use Amount;
use Carbon\Carbon;
use FireflyIII\Exceptions\FireflyException;
use FireflyIII\Helpers\Collector\JournalCollectorInterface;
use FireflyIII\Http\Requests\BudgetFormRequest;
use FireflyIII\Http\Requests\BudgetIncomeRequest;
use FireflyIII\Models\AccountType;
use FireflyIII\Models\Budget;
use FireflyIII\Models\BudgetLimit;
use FireflyIII\Repositories\Account\AccountRepositoryInterface;
use FireflyIII\Repositories\Budget\BudgetRepositoryInterface;
use FireflyIII\Support\CacheProperties;
use Illuminate\Http\Request;
use Illuminate\Support\Collection;
use Preferences;
use Response;
use Session;
use View;

/**
 * Class BudgetController
 *
 * @package FireflyIII\Http\Controllers
 */
class BudgetController extends Controller
{

    /** @var  BudgetRepositoryInterface */
    private $repository;

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

        View::share('hideBudgets', true);

        $this->middleware(
            function ($request, $next) {
                View::share('title', trans('firefly.budgets'));
                View::share('mainTitleIcon', 'fa-tasks');
                $this->repository = app(BudgetRepositoryInterface::class);

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

    /**
     * @param Request $request
     * @param Budget  $budget
     *
     * @return \Illuminate\Http\JsonResponse
     */
    public function amount(Request $request, Budget $budget)
    {
        $amount = intval($request->get('amount'));
        /** @var Carbon $start */
        $start = session('start', Carbon::now()->startOfMonth());
        /** @var Carbon $end */
        $end         = session('end', Carbon::now()->endOfMonth());
        $budgetLimit = $this->repository->updateLimitAmount($budget, $start, $end, $amount);
        if ($amount == 0) {
            $budgetLimit = null;
        }
        Preferences::mark();

        return Response::json(['name' => $budget->name, 'limit' => $budgetLimit ? $budgetLimit->id : 0, 'amount' => $amount]);

    }

    /**
     * @return View
     */
    public function create()
    {
        // put previous url in session if not redirect from store (not "create another").
        if (session('budgets.create.fromStore') !== true) {
            $this->rememberPreviousUri('budgets.create.uri');
        }
        Session::forget('budgets.create.fromStore');
        Session::flash('gaEventCategory', 'budgets');
        Session::flash('gaEventAction', 'create');
        $subTitle = (string)trans('firefly.create_new_budget');

        return view('budgets.create', compact('subTitle'));
    }

    /**
     * @param Budget $budget
     *
     * @return View
     */
    public function delete(Budget $budget)
    {
        $subTitle = trans('firefly.delete_budget', ['name' => $budget->name]);

        // put previous url in session
        $this->rememberPreviousUri('budgets.delete.uri');
        Session::flash('gaEventCategory', 'budgets');
        Session::flash('gaEventAction', 'delete');

        return view('budgets.delete', compact('budget', 'subTitle'));
    }

    /**
     * @param Budget $budget
     *
     * @return \Illuminate\Http\RedirectResponse
     */
    public function destroy(Budget $budget)
    {

        $name = $budget->name;
        $this->repository->destroy($budget);
        Session::flash('success', strval(trans('firefly.deleted_budget', ['name' => e($name)])));
        Preferences::mark();

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

    /**
     * @param Budget $budget
     *
     * @return View
     */
    public function edit(Budget $budget)
    {
        $subTitle = trans('firefly.edit_budget', ['name' => $budget->name]);

        // put previous url in session if not redirect from store (not "return_to_edit").
        if (session('budgets.edit.fromUpdate') !== true) {
            $this->rememberPreviousUri('budgets.edit.uri');
        }
        Session::forget('budgets.edit.fromUpdate');
        Session::flash('gaEventCategory', 'budgets');
        Session::flash('gaEventAction', 'edit');

        return view('budgets.edit', compact('budget', 'subTitle'));

    }

    /**
     * @return View
     */
    public function index()
    {
        $this->repository->cleanupBudgets();

        $budgets           = $this->repository->getActiveBudgets();
        $inactive          = $this->repository->getInactiveBudgets();
        $start             = session('start', new Carbon);
        $end               = session('end', new Carbon);
        $periodStart       = $start->formatLocalized($this->monthAndDayFormat);
        $periodEnd         = $end->formatLocalized($this->monthAndDayFormat);
        $budgetInformation = $this->collectBudgetInformation($budgets, $start, $end);
        $defaultCurrency   = Amount::getDefaultCurrency();
        $available         = $this->repository->getAvailableBudget($defaultCurrency, $start, $end);
        $spent             = array_sum(array_column($budgetInformation, 'spent'));
        $budgeted          = array_sum(array_column($budgetInformation, 'budgeted'));

        return view(
            'budgets.index',
            compact('available', 'periodStart', 'periodEnd', 'budgetInformation', 'inactive', 'budgets', 'spent', 'budgeted')
        );
    }

    /**
     * @param Request $request
     *
     * @return View
     */
    public function noBudget(Request $request)
    {
        /** @var Carbon $start */
        $start = session('start', Carbon::now()->startOfMonth());
        /** @var Carbon $end */
        $end      = session('end', Carbon::now()->endOfMonth());
        $page     = intval($request->get('page')) == 0 ? 1 : intval($request->get('page'));
        $pageSize = intval(Preferences::get('transactionPageSize', 50)->data);
        $subTitle = trans(
            'firefly.without_budget_between',
            ['start' => $start->formatLocalized($this->monthAndDayFormat), 'end' => $end->formatLocalized($this->monthAndDayFormat)]
        );

        // collector
        /** @var JournalCollectorInterface $collector */
        $collector = app(JournalCollectorInterface::class);
        $collector->setAllAssetAccounts()->setRange($start, $end)->setLimit($pageSize)->setPage($page)->withoutBudget();
        $journals = $collector->getPaginatedJournals();
        $journals->setPath('/budgets/list/noBudget');

        return view('budgets.no-budget', compact('journals', 'subTitle'));
    }

    /**
     * @return \Illuminate\Http\RedirectResponse
     */
    public function postUpdateIncome(BudgetIncomeRequest $request)
    {
        $start           = session('start', new Carbon);
        $end             = session('end', new Carbon);
        $defaultCurrency = Amount::getDefaultCurrency();
        $amount          = $request->get('amount');

        $this->repository->setAvailableBudget($defaultCurrency, $start, $end, $amount);
        Preferences::mark();

        return redirect(route('budgets.index'));
    }

    /**
     * @param Request $request
     * @param Budget  $budget
     *
     * @return View
     */
    public function show(Request $request, Budget $budget)
    {
        /** @var Carbon $start */
        $start      = session('first', Carbon::create()->startOfYear());
        $end        = new Carbon;
        $page       = intval($request->get('page')) == 0 ? 1 : intval($request->get('page'));
        $pageSize   = intval(Preferences::get('transactionPageSize', 50)->data);
        $limits     = $this->getLimits($budget, $start, $end);
        $repetition = null;
        // collector:
        /** @var JournalCollectorInterface $collector */
        $collector = app(JournalCollectorInterface::class);
        $collector->setAllAssetAccounts()->setRange($start, $end)->setBudget($budget)->setLimit($pageSize)->setPage($page)->withCategoryInformation();
        $journals = $collector->getPaginatedJournals();
        $journals->setPath('/budgets/show/' . $budget->id);


        $subTitle = e($budget->name);

        return view('budgets.show', compact('limits', 'budget', 'repetition', 'journals', 'subTitle'));
    }

    /**
     * @param Request     $request
     * @param Budget      $budget
     * @param BudgetLimit $budgetLimit
     *
     * @return View
     * @throws FireflyException
     */
    public function showByBudgetLimit(Request $request, Budget $budget, BudgetLimit $budgetLimit)
    {
        if ($budgetLimit->budget->id != $budget->id) {
            throw new FireflyException('This budget limit is not part of this budget.');
        }

        $page     = intval($request->get('page')) == 0 ? 1 : intval($request->get('page'));
        $pageSize = intval(Preferences::get('transactionPageSize', 50)->data);
        $subTitle = trans(
            'firefly.budget_in_period', [
                                          'name'  => $budget->name,
                                          'start' => $budgetLimit->start_date->formatLocalized($this->monthAndDayFormat),
                                          'end'   => $budgetLimit->end_date->formatLocalized($this->monthAndDayFormat),
                                      ]
        );

        // collector:
        /** @var JournalCollectorInterface $collector */
        $collector = app(JournalCollectorInterface::class);
        $collector->setAllAssetAccounts()->setRange($budgetLimit->start_date, $budgetLimit->end_date)
                  ->setBudget($budget)->setLimit($pageSize)->setPage($page)->withCategoryInformation();
        $journals = $collector->getPaginatedJournals();
        $journals->setPath('/budgets/show/' . $budget->id . '/' . $budgetLimit->id);


        $start  = session('first', Carbon::create()->startOfYear());
        $end    = new Carbon;
        $limits = $this->getLimits($budget, $start, $end);

        return view('budgets.show', compact('limits', 'budget', 'budgetLimit', 'journals', 'subTitle'));

    }

    /**
     * @param BudgetFormRequest $request
     *
     * @return \Illuminate\Http\RedirectResponse
     */
    public function store(BudgetFormRequest $request)
    {
        $data   = $request->getBudgetData();
        $budget = $this->repository->store($data);

        Session::flash('success', strval(trans('firefly.stored_new_budget', ['name' => e($budget->name)])));
        Preferences::mark();

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

            return redirect(route('budgets.create'))->withInput();
        }

        return redirect($this->getPreviousUri('budgets.create.uri'));
    }

    /**
     * @param BudgetFormRequest $request
     * @param Budget            $budget
     *
     * @return \Illuminate\Http\RedirectResponse
     */
    public function update(BudgetFormRequest $request, Budget $budget)
    {
        $data = $request->getBudgetData();
        $this->repository->update($budget, $data);

        Session::flash('success', strval(trans('firefly.updated_budget', ['name' => e($budget->name)])));
        Preferences::mark();

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

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

        return redirect($this->getPreviousUri('budgets.edit.uri'));
    }

    /**
     * @return View
     */
    public function updateIncome()
    {
        $start           = session('start', new Carbon);
        $end             = session('end', new Carbon);
        $defaultCurrency = Amount::getDefaultCurrency();
        $available       = $this->repository->getAvailableBudget($defaultCurrency, $start, $end);


        return view('budgets.income', compact('available', 'start', 'end'));
    }

    /**
     * @param Collection $budgets
     * @param Carbon     $start
     * @param Carbon     $end
     *
     * @return array
     */
    private function collectBudgetInformation(Collection $budgets, Carbon $start, Carbon $end): array
    {
        // get account information
        /** @var AccountRepositoryInterface $accountRepository */
        $accountRepository = app(AccountRepositoryInterface::class);
        $accounts          = $accountRepository->getAccountsByType([AccountType::DEFAULT, AccountType::ASSET, AccountType::CASH]);
        $return            = [];
        /** @var Budget $budget */
        foreach ($budgets as $budget) {
            $budgetId          = $budget->id;
            $return[$budgetId] = [
                'spent'      => $this->repository->spentInPeriod(new Collection([$budget]), $accounts, $start, $end),
                'budgeted'   => '0',
                'currentRep' => false,
            ];
            $budgetLimits      = $this->repository->getBudgetLimits($budget, $start, $end);
            $otherLimits       = new Collection;

            // get all the budget limits relevant between start and end and examine them:
            /** @var BudgetLimit $limit */
            foreach ($budgetLimits as $limit) {
                if ($limit->start_date->isSameDay($start) && $limit->end_date->isSameDay($end)
                ) {
                    $return[$budgetId]['currentLimit'] = $limit;
                    $return[$budgetId]['budgeted']     = $limit->amount;
                    continue;
                }
                // otherwise it's just one of the many relevant repetitions:
                $otherLimits->push($limit);
            }
            $return[$budgetId]['otherLimits'] = $otherLimits;
        }

        return $return;
    }


    /**
     * @param Budget $budget
     * @param Carbon $start
     * @param Carbon $end
     *
     * @return Collection
     */
    private function getLimits(Budget $budget, Carbon $start, Carbon $end): Collection
    {
        // properties for cache
        $cache = new CacheProperties;
        $cache->addProperty($start);
        $cache->addProperty($end);
        $cache->addProperty($budget->id);
        $cache->addProperty('get-limits');

        if ($cache->has()) {
            return $cache->get();
        }

        /** @var AccountRepositoryInterface $accountRepository */
        $accountRepository = app(AccountRepositoryInterface::class);
        $accounts          = $accountRepository->getAccountsByType([AccountType::DEFAULT, AccountType::ASSET, AccountType::CASH]);
        $set               = $this->repository->getBudgetLimits($budget, $start, $end);
        $limits            = new Collection();

        /** @var BudgetLimit $entry */
        foreach ($set as $entry) {
            $entry->spent = $this->repository->spentInPeriod(new Collection([$budget]), $accounts, $entry->start_date, $entry->end_date);
            $limits->push($entry);
        }
        $cache->store($limits);

        return $set;
    }

}