<?php

namespace FireflyIII\Helpers\Report;

use App;
use Auth;
use Carbon\Carbon;
use FireflyIII\Models\Account;
use Illuminate\Database\Query\JoinClause;
use Illuminate\Support\Collection;
use Steam;

/**
 * Class ReportHelper
 *
 * @package FireflyIII\Helpers\Report
 */
class ReportHelper implements ReportHelperInterface
{

    /**
     * This method gets some kind of list for a monthly overview.
     *
     * @param Carbon $date
     * @param bool   $includeShared
     *
     * @return Collection
     */
    public function getBudgetsForMonth(Carbon $date, $includeShared = false)
    {
        /** @var \FireflyIII\Helpers\Report\ReportQueryInterface $query */
        $query = App::make('FireflyIII\Helpers\Report\ReportQueryInterface');

        $start = clone $date;
        $start->startOfMonth();
        $end = clone $date;
        $end->endOfMonth();
        $set = Auth::user()->budgets()->orderBy('budgets.name', 'ASC')
                   ->leftJoin(
                       'budget_limits', function (JoinClause $join) use ($date) {
                       $join->on('budget_limits.budget_id', '=', 'budgets.id')->where('budget_limits.startdate', '=', $date->format('Y-m-d'));
                   }
                   )
                   ->get(['budgets.*', 'budget_limits.amount as queryAmount']);

        $budgets                   = Steam::makeArray($set);
        $amountSet                 = $query->journalsByBudget($start, $end, $includeShared);
        $amounts                   = Steam::makeArray($amountSet);
        $budgets                   = Steam::mergeArrays($budgets, $amounts);
        $budgets[0]['spent']       = isset($budgets[0]['spent']) ? $budgets[0]['spent'] : 0.0;
        $budgets[0]['queryAmount'] = isset($budgets[0]['queryAmount']) ? $budgets[0]['queryAmount'] : 0.0;
        $budgets[0]['name']        = 'No budget';

        // find transactions to shared asset accounts, which are without a budget by default:
        // which is only relevant when shared asset accounts are hidden.
        if ($includeShared === false) {
            $transfers = $query->sharedExpenses($start, $end)->sum('queryAmount');
            $budgets[0]['spent'] += floatval($transfers) * -1;
        }

        return $budgets;
    }

    /**
     * @param Carbon $date
     *
     * @return array
     */
    public function listOfMonths(Carbon $date)
    {

        $start  = clone $date;
        $end    = Carbon::now();
        $months = [];
        while ($start <= $end) {
            $year            = $start->year;
            $months[$year][] = [
                'formatted' => $start->formatLocalized('%B %Y'),
                'month'     => $start->month,
                'year'      => $year,
            ];
            $start->addMonth();
        }

        return $months;
    }

}