<?php

namespace FireflyIII\Repositories\Budget;

use Auth;
use Carbon\Carbon;
use FireflyIII\Models\Budget;
use FireflyIII\Models\BudgetLimit;
use FireflyIII\Models\LimitRepetition;
use Illuminate\Database\Query\Builder as QueryBuilder;
use Illuminate\Pagination\LengthAwarePaginator;
use Illuminate\Support\Collection;

/**
 * Class BudgetRepository
 *
 * @package FireflyIII\Repositories\Budget
 */
class BudgetRepository implements BudgetRepositoryInterface
{

    /**
     * @return void
     */
    public function cleanupBudgets()
    {
        $limits = BudgetLimit::leftJoin('budgets', 'budgets.id', '=', 'budget_limits.budget_id')->get(['budget_limits.*']);

        // loop budget limits:
        $found = [];
        /** @var BudgetLimit $limit */
        foreach ($limits as $limit) {
            $key = $limit->budget_id . '-' . $limit->startdate;
            if (isset($found[$key])) {
                $limit->delete();
            } else {
                $found[$key] = true;
            }
            unset($key);
        }

        // delete limits with amount 0:
        BudgetLimit::where('amount', 0)->delete();

    }

    /**
     * @param Budget $budget
     *
     * @return boolean
     */
    public function destroy(Budget $budget)
    {
        $budget->delete();

        return true;
    }

    /**
     * @param Budget $budget
     * @param Carbon $date
     *
     * @return float
     */
    public function expensesOnDay(Budget $budget, Carbon $date)
    {
        return floatval($budget->transactionjournals()->lessThan(0)->transactionTypes(['Withdrawal'])->onDate($date)->sum('amount'));
    }

    /**
     * @return Collection
     */
    public function getActiveBudgets()
    {
        $budgets = Auth::user()->budgets()->where('active', 1)->get();
        $budgets->sortBy('name');

        return $budgets;
    }

    /**
     * @param Budget $budget
     * @param Carbon $start
     * @param Carbon $end
     *
     * @return Collection
     */
    public function getBudgetLimitRepetitions(Budget $budget, Carbon $start, Carbon $end)
    {
        /** @var Collection $repetitions */
        return LimitRepetition::
        leftJoin('budget_limits', 'limit_repetitions.budget_limit_id', '=', 'budget_limits.id')
                              ->where('limit_repetitions.startdate', '<=', $end->format('Y-m-d 00:00:00'))
                              ->where('limit_repetitions.startdate', '>=', $start->format('Y-m-d 00:00:00'))
                              ->where('budget_limits.budget_id', $budget->id)
                              ->get(['limit_repetitions.*']);
    }

    /**
     * @param Budget $budget
     *
     * @return Collection
     */
    public function getBudgetLimits(Budget $budget)
    {
        return $budget->budgetLimits()->orderBy('startdate', 'DESC')->get();
    }

    /**
     * @return Collection
     */
    public function getBudgets()
    {
        $budgets = Auth::user()->budgets()->get();
        $budgets->sortBy('name');

        return $budgets;
    }

    /**
     * @param Budget $budget
     * @param Carbon $date
     *
     * @return LimitRepetition|null
     */
    public function getCurrentRepetition(Budget $budget, Carbon $date)
    {
        return $budget->limitrepetitions()->where('limit_repetitions.startdate', $date)->first(['limit_repetitions.*']);
    }

    /**
     * @param Budget $budget
     *
     * @return Carbon
     */
    public function getFirstBudgetLimitDate(Budget $budget)
    {
        $limit = $budget->budgetlimits()->orderBy('startdate', 'ASC')->first();
        if ($limit) {
            return $limit->startdate;
        }

        return Carbon::now()->startOfYear();
    }

    /**
     * @return Collection
     */
    public function getInactiveBudgets()
    {
        return Auth::user()->budgets()->where('active', 0)->get();
    }

    /**
     * Returns all the transaction journals for a limit, possibly limited by a limit repetition.
     *
     * @param Budget          $budget
     * @param LimitRepetition $repetition
     * @param int             $take
     *
     * @return \Illuminate\Pagination\Paginator
     */
    public function getJournals(Budget $budget, LimitRepetition $repetition = null, $take = 50)
    {
        $offset = intval(\Input::get('page')) > 0 ? intval(\Input::get('page')) * $take : 0;


        $setQuery   = $budget->transactionJournals()->withRelevantData()->take($take)->offset($offset)
                             ->orderBy('transaction_journals.date', 'DESC')
                             ->orderBy('transaction_journals.order', 'ASC')
                             ->orderBy('transaction_journals.id', 'DESC');
        $countQuery = $budget->transactionJournals();


        if (!is_null($repetition->id)) {
            $setQuery->after($repetition->startdate)->before($repetition->enddate);
            $countQuery->after($repetition->startdate)->before($repetition->enddate);
        }


        $set   = $setQuery->get(['transaction_journals.*']);
        $count = $countQuery->count();

        return new LengthAwarePaginator($set, $count, $take, $offset);
    }

    /**
     * @param Budget $budget
     *
     * @return Carbon
     */
    public function getLastBudgetLimitDate(Budget $budget)
    {
        $limit = $budget->budgetlimits()->orderBy('startdate', 'DESC')->first();
        if ($limit) {
            return $limit->startdate;
        }

        return Carbon::now()->startOfYear();
    }

    /**
     * @param Budget $budget
     * @param Carbon $date
     *
     * @return float|null
     */
    public function getLimitAmountOnDate(Budget $budget, Carbon $date)
    {
        $repetition = LimitRepetition::leftJoin('budget_limits', 'limit_repetitions.budget_limit_id', '=', 'budget_limits.id')
                                     ->where('limit_repetitions.startdate', $date->format('Y-m-d 00:00:00'))
                                     ->where('budget_limits.budget_id', $budget->id)
                                     ->first(['limit_repetitions.*']);

        if ($repetition) {
            return floatval($repetition->amount);
        }

        return null;
    }

    /**
     * @param Carbon $start
     * @param Carbon $end
     *
     * @return Collection
     */
    public function getWithoutBudget(Carbon $start, Carbon $end)
    {
        return Auth::user()
                   ->transactionjournals()
                   ->leftJoin('budget_transaction_journal', 'budget_transaction_journal.transaction_journal_id', '=', 'transaction_journals.id')
                   ->whereNull('budget_transaction_journal.id')
                   ->before($end)
                   ->after($start)
                   ->orderBy('transaction_journals.date', 'DESC')
                   ->orderBy('transaction_journals.order', 'ASC')
                   ->orderBy('transaction_journals.id', 'DESC')
                   ->get(['transaction_journals.*']);
    }

    /**
     * @param Carbon $start
     * @param Carbon $end
     *
     * @return mixed
     */
    public function getWithoutBudgetSum(Carbon $start, Carbon $end)
    {
        $noBudgetSet = Auth::user()
                           ->transactionjournals()
                           ->whereNotIn(
                               'transaction_journals.id', function (QueryBuilder $query) use ($start, $end) {
                               $query
                                   ->select('transaction_journals.id')
                                   ->from('transaction_journals')
                                   ->leftJoin('budget_transaction_journal', 'budget_transaction_journal.transaction_journal_id', '=', 'transaction_journals.id')
                                   ->where('transaction_journals.date', '>=', $start->format('Y-m-d 00:00:00'))
                                   ->where('transaction_journals.date', '<=', $end->format('Y-m-d 00:00:00'))
                                   ->whereNotNull('budget_transaction_journal.budget_id');
                           }
                           )
                           ->before($end)
                           ->after($start)
                           ->lessThan(0)
                           ->transactionTypes(['Withdrawal'])
                           ->get();

        return floatval($noBudgetSet->sum('amount')) * -1;
    }

    /**
     * @param Budget $budget
     * @param Carbon $date
     *
     * @return float
     */
    public function spentInMonth(Budget $budget, Carbon $date)
    {
        $end = clone $date;
        $date->startOfMonth();
        $end->endOfMonth();
        $sum = floatval($budget->transactionjournals()->before($end)->after($date)->lessThan(0)->sum('amount')) * -1;

        return $sum;
    }

    /**
     * @param array $data
     *
     * @return Budget
     */
    public function store(array $data)
    {
        $newBudget = new Budget(
            [
                'user_id' => $data['user'],
                'name'    => $data['name'],
            ]
        );
        $newBudget->save();

        return $newBudget;
    }

    /**
     * @param Budget $budget
     * @param Carbon $start
     * @param Carbon $end
     *
     * @return float
     */
    public function sumBudgetExpensesInPeriod(Budget $budget, $start, $end)
    {
        return floatval($budget->transactionjournals()->before($end)->after($start)->lessThan(0)->sum('amount')) * -1;
    }

    /**
     * @param Budget $budget
     * @param array  $data
     *
     * @return Budget
     */
    public function update(Budget $budget, array $data)
    {
        // update the account:
        $budget->name   = $data['name'];
        $budget->active = $data['active'];
        $budget->save();

        return $budget;
    }

    /**
     * @param Budget $budget
     * @param Carbon $date
     * @param        $amount
     *
     * @return LimitRepetition|null
     */
    public function updateLimitAmount(Budget $budget, Carbon $date, $amount)
    {
        // there should be a budget limit for this startdate:
        /** @var BudgetLimit $limit */
        $limit = $budget->budgetlimits()->where('budget_limits.startdate', $date)->first(['budget_limits.*']);

        if (!$limit) {
            // if not, create one!
            $limit = new BudgetLimit;
            $limit->budget()->associate($budget);
            $limit->startdate   = $date;
            $limit->amount      = $amount;
            $limit->repeat_freq = 'monthly';
            $limit->repeats     = 0;
            $limit->save();

            // likewise, there should be a limit repetition to match the end date
            // (which is always the end of the month) but that is caught by an event.

        } else {
            if ($amount > 0) {
                $limit->amount = $amount;
                $limit->save();
            } else {
                $limit->delete();
            }
        }

        return $limit;


    }
}