<?php
declare(strict_types = 1);

namespace FireflyIII\Http\Controllers\Chart;

use Carbon\Carbon;
use FireflyIII\Generator\Chart\Budget\BudgetChartGeneratorInterface;
use FireflyIII\Http\Controllers\Controller;
use FireflyIII\Models\Budget;
use FireflyIII\Models\LimitRepetition;
use FireflyIII\Repositories\Account\AccountRepositoryInterface as ARI;
use FireflyIII\Repositories\Budget\BudgetRepositoryInterface;
use Illuminate\Support\Collection;

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

    /** @var  \FireflyIII\Generator\Chart\Budget\BudgetChartGeneratorInterface */
    protected $generator;

    /**
     *
     */
    public function __construct()
    {
        parent::__construct();
        // create chart generator:
        $this->generator = app(BudgetChartGeneratorInterface::class);
    }

    /**
     * checked
     *
     * @param BudgetRepositoryInterface $repository
     * @param Budget                    $budget
     *
     * @return \Symfony\Component\HttpFoundation\Response
     */
    public function budget(BudgetRepositoryInterface $repository, Budget $budget)
    {
        /**
         * // dates and times
         * $first = $repository->getFirstBudgetLimitDate($budget);
         * $range = Preferences::get('viewRange', '1M')->data;
         * $last  = session('end', new Carbon);
         *
         * // chart properties for cache:
         * $cache = new CacheProperties();
         * $cache->addProperty($first);
         * $cache->addProperty($last);
         * $cache->addProperty('budget');
         * if ($cache->has()) {
         *
         * //return Response::json($cache->get());
         * }
         *
         * $final = clone $last;
         * $final->addYears(2);
         * $last    = Navigation::endOfX($last, $range, $final);
         * $entries = new Collection;
         * // get all expenses:
         * $spentArray = $repository->spentPerDay($budget, $first, $last, new Collection);
         *
         * while ($first < $last) {
         *
         * // periodspecific dates:
         * $currentStart = Navigation::startOfPeriod($first, $range);
         * $currentEnd   = Navigation::endOfPeriod($first, $range);
         * $spent        = $this->getSumOfRange($currentStart, $currentEnd, $spentArray);
         * $entry        = [$first, ($spent * -1)];
         *
         * $entries->push($entry);
         * $first = Navigation::addPeriod($first, $range, 0);
         * }
         *
         * $data = $this->generator->budgetLimit($entries, 'month');
         * $cache->store($data);
         *
         * return Response::json($data);
         * **/
    }

    /**
     * Shows the amount left in a specific budget limit.
     *
     * @param BudgetRepositoryInterface $repository
     * @param Budget                    $budget
     * @param LimitRepetition           $repetition
     *
     * @return \Symfony\Component\HttpFoundation\Response
     */
    public function budgetLimit(BudgetRepositoryInterface $repository, Budget $budget, LimitRepetition $repetition)
    {
        /**
         * $start = clone $repetition->startdate;
         * $end   = $repetition->enddate;
         *
         * // chart properties for cache:
         * $cache = new CacheProperties();
         * $cache->addProperty($start);
         * $cache->addProperty($end);
         * $cache->addProperty('budget');
         * $cache->addProperty('limit');
         * $cache->addProperty($budget->id);
         * $cache->addProperty($repetition->id);
         * if ($cache->has()) {
         * return Response::json($cache->get());
         * }
         *
         * $set     = $repository->spentPerDay($budget, $start, $end, new Collection);
         * $entries = new Collection;
         * $amount  = $repetition->amount;
         *
         * // get sum (har har)!
         * while ($start <= $end) {
         * $formatted = $start->format('Y-m-d');
         * $sum       = $set[$formatted] ?? '0';
         *
         * // Sum of expenses on this day:
         * $amount = round(bcadd(strval($amount), $sum), 2);
         * $entries->push([clone $start, $amount]);
         * $start->addDay();
         * }
         *
         * $data = $this->generator->budgetLimit($entries, 'monthAndDay');
         * $cache->store($data);
         *
         * return Response::json($data);
         **/

    }

    /**
     * Shows a budget list with spent/left/overspent.
     *
     * @param BudgetRepositoryInterface $repository
     *
     * @param ARI                       $accountRepository
     *
     * @return \Symfony\Component\HttpFoundation\Response
     */
    public function frontpage(BudgetRepositoryInterface $repository, ARI $accountRepository)
    {
        /**
         * $start = session('start', Carbon::now()->startOfMonth());
         * $end   = session('end', Carbon::now()->endOfMonth());
         *
         * // chart properties for cache:
         * $cache = new CacheProperties();
         * $cache->addProperty($start);
         * $cache->addProperty($end);
         * $cache->addProperty('budget');
         * $cache->addProperty('all');
         * if ($cache->has()) {
         * return Response::json($cache->get());
         * }
         *
         * $budgets    = $repository->getBudgetsAndLimitsInRange($start, $end);
         * $allEntries = new Collection;
         * $accounts   = $accountRepository->getAccounts(['Default account', 'Asset account', 'Cash account']);
         * $format     = strval(trans('config.month_and_day'));
         *
         *
         * // @var Budget $budget
         * foreach ($budgets as $budget) {
         * // we already have amount, startdate and enddate.
         * // if this "is" a limit repetition (as opposed to a budget without one entirely)
         * // depends on whether startdate and enddate are null.
         * $name = $budget->name;
         * if (is_null($budget->startdate) && is_null($budget->enddate)) {
         * $currentStart = clone $start;
         * $currentEnd   = clone $end;
         * $expenses     = $repository->balanceInPeriod($budget, $currentStart, $currentEnd, $accounts);
         * $amount       = '0';
         * $left         = '0';
         * $spent        = $expenses;
         * $overspent    = '0';
         * } else {
         *
         * // update the display name if the range
         * // of the limit repetition does not match
         * // the session's range (for clarity).
         * if (
         * ($start->format('Y-m-d') != $budget->startdate->format('Y-m-d'))
         * || ($end->format('Y-m-d') != $budget->enddate->format('Y-m-d'))
         * ) {
         * $name .= ' ' . trans(
         * 'firefly.between_dates',
         * [
         * 'start' => $budget->startdate->formatLocalized($format),
         * 'end'   => $budget->startdate->formatLocalized($format),
         * ]
         * );
         * }
         * $currentStart = clone $budget->startdate;
         * $currentEnd   = clone $budget->enddate;
         * $expenses     = $repository->balanceInPeriod($budget, $currentStart, $currentEnd, $accounts);
         * $amount       = $budget->amount;
         * // smaller than 1 means spent MORE than budget allows.
         * $left      = bccomp(bcadd($budget->amount, $expenses), '0') < 1 ? '0' : bcadd($budget->amount, $expenses);
         * $spent     = bccomp(bcadd($budget->amount, $expenses), '0') < 1 ? bcmul($amount, '-1') : $expenses;
         * $overspent = bccomp(bcadd($budget->amount, $expenses), '0') < 1 ? bcadd($budget->amount, $expenses) : '0';
         * }
         *
         * $allEntries->push([$name, $left, $spent, $overspent, $amount, $expenses]);
         * }
         *
         * $noBudgetExpenses = $repository->getWithoutBudgetSum($accounts, $start, $end);
         * $allEntries->push([trans('firefly.no_budget'), '0', '0', $noBudgetExpenses, '0', '0']);
         * $data = $this->generator->frontpage($allEntries);
         * $cache->store($data);
         *
         * return Response::json($data);
         **/
    }

    /**
     *
     * @param BudgetRepositoryInterface $repository
     * @param                           $reportType
     * @param Carbon                    $start
     * @param Carbon                    $end
     * @param Collection                $accounts
     * @param Collection                $budgets
     *
     *
     * @return \Illuminate\Http\JsonResponse
     */
    public function multiYear(BudgetRepositoryInterface $repository, string $reportType, Carbon $start, Carbon $end, Collection $accounts, Collection $budgets)
    {
        /**
         * // chart properties for cache:
         * $cache = new CacheProperties();
         * $cache->addProperty($reportType);
         * $cache->addProperty($start);
         * $cache->addProperty($end);
         * $cache->addProperty($accounts);
         * $cache->addProperty($budgets);
         * $cache->addProperty('multiYearBudget');
         *
         * if ($cache->has()) {
         * return Response::json($cache->get());
         * }
         *
         * // Get the budgeted amounts for each budgets in each year.
         * $budgetedSet   = $repository->getBudgetedPerYear($budgets, $start, $end);
         * $budgetedArray = [];
         * // @var Budget $entry
         * foreach ($budgetedSet as $entry) {
         * $budgetedArray[$entry->id][$entry->dateFormatted] = $entry->budgeted;
         * }
         *
         * $set     = $repository->getBudgetsAndExpensesPerYear($budgets, $accounts, $start, $end);
         * $entries = new Collection;
         * // go by budget, not by year.
         * // @var Budget $budget
         * foreach ($budgets as $budget) {
         * $entry        = ['name' => '', 'spent' => [], 'budgeted' => []];
         * $id           = $budget->id;
         * $currentStart = clone $start;
         * while ($currentStart < $end) {
         * // fix the date:
         * $currentEnd = clone $currentStart;
         * $currentEnd->endOfYear();
         *
         * // basic information:
         * $year          = $currentStart->year;
         * $entry['name'] = $budget->name ?? (string)trans('firefly.no_budget');
         * $spent         = 0;
         * // this might be a good moment to collect no budget stuff.
         * if (is_null($budget->id)) {
         * // get without budget sum in range:
         * $spent = $repository->getWithoutBudgetSum($accounts, $currentStart, $currentEnd) * -1;
         * } else {
         * if (isset($set[$id]['entries'][$year])) {
         * $spent = $set[$id]['entries'][$year] * -1;
         * }
         * }
         *
         * $budgeted                 = $budgetedArray[$id][$year] ?? '0';
         * $entry['spent'][$year]    = $spent;
         * $entry['budgeted'][$year] = round($budgeted, 2);
         *
         *
         * // jump to next year.
         * $currentStart = clone $currentEnd;
         * $currentStart->addDay();
         * }
         * $entries->push($entry);
         * }
         * // generate chart with data:
         * $data = $this->generator->multiYear($entries);
         * $cache->store($data);
         *
         * return Response::json($data);
         **/
    }

    /**
     * @param Budget     $budget
     * @param string     $reportType
     * @param Carbon     $start
     * @param Carbon     $end
     * @param Collection $accounts
     *
     * @return \Illuminate\Http\JsonResponse
     */
    public function period(Budget $budget, string $reportType, Carbon $start, Carbon $end, Collection $accounts)
    {
        /**
         * // chart properties for cache:
         * $cache = new CacheProperties();
         * $cache->addProperty($start);
         * $cache->addProperty($end);
         * $cache->addProperty($reportType);
         * $cache->addProperty($accounts);
         * $cache->addProperty($budget->id);
         * $cache->addProperty('budget');
         * $cache->addProperty('period');
         * if ($cache->has()) {
         * return Response::json($cache->get());
         * }
         *
         * // @var BudgetRepositoryInterface $repository
         * $repository = app(BudgetRepositoryInterface::class);
         * // loop over period, add by users range:
         * $current   = clone $start;
         * $viewRange = Preferences::get('viewRange', '1M')->data;
         * $set       = new Collection;
         * while ($current < $end) {
         * $currentStart = clone $current;
         * $currentEnd   = Navigation::endOfPeriod($currentStart, $viewRange);
         *
         * // get all budget limits and their repetitions.
         * $reps      = $repository->getAllBudgetLimitRepetitions($currentStart, $currentEnd, $budget);
         * $budgeted  = $reps->sum('amount');
         * $perBudget = $repository->spentPerBudgetPerAccount(new Collection([$budget]), $accounts, $currentStart, $currentEnd);
         * // includes null, so filter!
         * $perBudget = $perBudget->filter(
         * function (TransactionJournal $journal) use ($budget) {
         * if (intval($journal->budget_id) === $budget->id) {
         * return $journal;
         * }
         * }
         * );
         *
         *
         * $spent = $perBudget->sum('spent');
         *
         * $entry = [
         * 'date'     => clone $currentStart,
         * 'budgeted' => $budgeted,
         * 'spent'    => $spent,
         * ];
         * $set->push($entry);
         * $currentEnd->addDay();
         * $current = clone $currentEnd;
         * }
         * $data = $this->generator->period($set, $viewRange);
         * $cache->store($data);
         *
         * return Response::json($data);
         */

    }

    /**
     *
     * @param BudgetRepositoryInterface $repository
     * @param                           $reportType
     * @param Carbon                    $start
     * @param Carbon                    $end
     * @param Collection                $accounts
     *
     * @return \Illuminate\Http\JsonResponse
     */
    public function year(BudgetRepositoryInterface $repository, string $reportType, Carbon $start, Carbon $end, Collection $accounts)
    {
        /**
         * // chart properties for cache:
         * $cache = new CacheProperties();
         * $cache->addProperty($start);
         * $cache->addProperty($end);
         * $cache->addProperty($reportType);
         * $cache->addProperty($accounts);
         * $cache->addProperty('budget');
         * $cache->addProperty('year');
         * if ($cache->has()) {
         * return Response::json($cache->get());
         * }
         *
         * $budgetInformation = $repository->getBudgetsAndExpensesPerMonth($accounts, $start, $end);
         * $budgets           = new Collection;
         * $entries           = new Collection;
         *
         * // @var array $row
         * foreach ($budgetInformation as $row) {
         * $budgets->push($row['budget']);
         * }
         * while ($start < $end) {
         * // month is the current end of the period:
         * $month = clone $start;
         * $month->endOfMonth();
         * $row           = [clone $start];
         * $dateFormatted = $start->format('Y-m');
         *
         * // each budget, check if there is an entry for this month:
         * // @var array $row
         * foreach ($budgetInformation as $budgetRow) {
         * $spent = 0; // nothing spent.
         * if (isset($budgetRow['entries'][$dateFormatted])) {
         * $spent = $budgetRow['entries'][$dateFormatted] * -1; // to fit array
         * }
         * $row[] = $spent;
         * }
         *
         * // add "no budget" thing.
         * $row[] = round(bcmul($repository->getWithoutBudgetSum($accounts, $start, $month), '-1'), 4);
         *
         * $entries->push($row);
         * $start->endOfMonth()->addDay();
         * }
         * $data = $this->generator->year($budgets, $entries);
         * $cache->store($data);
         *
         * return Response::json($data);
         */
    }
}