<?php

namespace App\Http\Controllers;

use App\Booking;
use App\SubBooking;
use App\PersonTarget;
use App\Project;
use App\AccountType;
use App\Person;

use App\Http\Requests\StoreBooking;
use App\Http\Requests\UpdateBooking;

use Illuminate\Http\Request;
use Carbon\Carbon;

class BookingsController extends Controller
{
    /**
     * Display a listing of the resource.
     *
     * @return \Illuminate\Http\Response
     */
    public function index($year)
    {
        $cashbook = $this->getCashbook($year);

        return view('bookings.index', $cashbook);
    }

    public function report($year) {
        $cashbook = $this->getCashbook($year);

        return view('bookings.print', $cashbook);
    }

    /**
     * Show the form for creating a new resource.
     *
     * @return \Illuminate\Http\Response
     */
    public function create()
    {
        $formArrays = BookingsController::loadFormArrays();

        $persons = Person::select('id', 'name_or_company', 'surname')
                         ->orderBy('name_or_company')->get();

        $personsArray = [];

        foreach ($persons as $person) {
            $personsArray[$person->id] = $person->fullName(true);
        }

        return view('bookings.create', array_merge(compact('personsArray'), $formArrays));
    }

    /**
     * Store a newly created resource in storage.
     *
     * @param  \Illuminate\Http\Request $request
     * @return \Illuminate\Http\Response
     */
    public function store(StoreBooking $request)
    {
        // Booking
        $booking = new Booking;

        $booking->date              = request('date');
        $booking->reference         = request('reference');
        $booking->person_or_company = request('person_or_company');
        $booking->note              = request('note');

        $booking->save();

        // SubBooking
        $subBooking = new SubBooking;

        $subBooking->reference        = request('reference');
        $subBooking->amount           = swapComma(request('amount'));
        $subBooking->account_type_id  = request('account_type_id');
        $subBooking->project_id       = request('project_id');

        if (request('person_target_id') !== null) {
            $subBooking->person_target_id = request('person_target_id');
        } elseif (request('personTarget')['person_id'] !== null) {
            $personTarget = new personTarget();

            $personTarget->io_type_id = $subBooking->ioType()->id;
            $personTarget->amount     = request('amount');
            $personTarget->reference  = request('reference');
            $personTarget->person_id  = request('personTarget')['person_id'];
            $personTarget->date       = is_null(request('personTarget')['date']) ?
                                        request('date') :
                                        request('personTarget')['date'];

            $personTarget->save();

            $subBooking->person_target_id = $personTarget->id;
        }

        $booking->subBookings()->save($subBooking);

        return redirect('/bookings/year-' . Carbon::parse(request('date'))->format('Y'));
    }

    /**
     * Display the specified resource.
     *
     * @param  \App\Booking $booking
     * @return \Illuminate\Http\Response
     */
    public function show(Booking $booking)
    {
        //
    }

    /**
     * Show the form for editing the specified resource.
     *
     * @param  \App\Booking $booking
     * @return \Illuminate\Http\Response
     */
    public function edit(Booking $booking)
    {
        $booking->load('subBookings',
                       'subBookings.personTarget:id,reference,person_id',
                       'subBookings.personTarget.person:id,name_or_company,surname');

        $formArrays = BookingsController::loadFormArrays();

        // Add the person targets of the booking to the personTargetsArray,
        // since it is possible that the person target of the sub-booking is no
        // longer open and therefor not loaded into the list of open targets.
        foreach ($booking->subBookings as $subBooking) {
            if (isset($subBooking->personTarget)) {
                $personTarget = $subBooking->personTarget;
                $person = $personTarget->person;

                $formArrays['openTargetsArray'][$person->fullName(true)][$personTarget->id]
                    = $personTarget->reference;
            }
        }

        return view('bookings.edit', array_merge(compact('booking'), $formArrays));
    }

    /**
     * Update the specified resource in storage.
     *
     * @param  \App\Http\Requests\UpdateBooking $request
     * @param  \App\Booking             $booking
     * @return \Illuminate\Http\Response
     */
    public function update(UpdateBooking $request, Booking $booking)
    {
        // Fill the booking with the edited values
        foreach (request('booking') as $colName => $value) {
            $booking->$colName = $value;
        }

        // Safe the edited booking in the database.
        $booking->save();

        // Check, if all sub-booking rows are empty. If so, redirect to the
        // delete view of the booking.
        $noMoreSubBookings = true;
        
        foreach (request('sub_booking') as $rSubBooking) {
            if (!allEmpty($rSubBooking)) {
                $noMoreSubBookings = false;
                break;
            }
        }

        if ($noMoreSubBookings) {
            return redirect('/bookings/' . $booking->id . '/delete');
        }

        // Fill a existent or new SubBooking with the values from the form and
        // safe it in the database.
        foreach (request('sub_booking') as $id => $rSubBooking) {
            // If a sub-booking row is completely empty, check whether there was
            // a sub-booking and all data was removed. In this case, remove the
            // respective SubBooking from the database.
            // If the line is the blank line for new entries, skip it.
            if (allEmpty($rSubBooking)) {
                if ($id != 0) {
                    SubBooking::find($id)->delete();
                }
                
                continue;
            }

            // Create new SubBooking or load an existing one.
            $subBooking = $id === 0 ?
                          new SubBooking() :
                          SubBooking::find($id);
            
            foreach ($rSubBooking as $colName => $value) {
                $subBooking->$colName = $value;
            }

            $booking->subBookings()->save($subBooking);
        }

        return redirect('/bookings/year-' . Carbon::parse(request('booking')['date'])->format('Y'));
    }

    /**
     * Show the dialog for deleting the specified resource.
     *
     * @param  \App\Booking $booking
     * @return \Illuminate\Http\Response
     */
    public function delete(Booking $booking)
    {
        $booking->load('subBookings.accountType.accountClass.ioType');
        
        return view('/bookings/delete', compact('booking'));
    }

    /**
     * Remove the specified resource from storage.
     *
     * @param  \App\Booking $booking
     * @return \Illuminate\Http\Response
     */
    public function destroy(Booking $booking)
    {
        $booking->delete();

        return redirect('/bookings/year-' . Carbon::parse(request('date'))->format('Y'));
    }

    /**
     * Load the data about person targets, projects and account types from the
     * database to show tis data in a form as dropdown menu.
     *
     * @return array
     */
    private function loadFormArrays()
    {
        // Get all open targets from the database ...
        $openTargets = PersonTarget::open()
            ->load('person:id,name_or_company,surname,title')
            ->sortBy('reference')
            ->sortBy('person.name_or_company')
            ->groupBy('person.id');

        // ... and create a list of the open targets to show it in the form as
        // dropdown menu.
        $openTargetsArray = [];

        foreach ($openTargets as $personTargets) {
            foreach ($personTargets as $personTarget) {
                $person = $personTarget->person;

                $openTargetsArray[$person->fullName(true)][$personTarget->id]
                    = $personTarget->reference;
            }
        }

        // Get all projects from the database ...
        $projects = Project::select('id', 'name', 'start_date', 'end_date')
            ->orderBy('name')
            ->get();

        // ... and create a list of the projects to show it in the form as
        // dropdown menu.
        $projectsArray = [];

        foreach ($projects as $project) {
            $timeOfProject = '';

            if ($project->start_date <= today() and $project->end_date >= today()) {
                $timeOfProject = 'Laufende Projekte';
            } elseif ($project->start_date > today()) {
                $timeOfProject = 'Zukünftige Projekte';
            } else {
                $timeOfProject = 'Vergangene Projekte';
            }

            $projectsArray['Vergangene Projekte'][$project->id] = $project->name;
        }

        // Get all account types from the database, together with their account
        // class and scope ...
        $accountTypes = AccountType::with(
            [
                'accountClass' => function ($query) {
                    $query->select('id', 'name', 'scope_id');
                },
                'accountClass.scope' => function ($query) {
                    $query->select('id', 'name');
                }
            ]
        )->orderBy('number')->get(['id', 'name', 'account_class_id', 'number']);

        // ... and create a list of the account types to show it in the form as
        // dropdown menu.
        $accountTypeArray = [];

        foreach ($accountTypes as $accountType) {
            $scope = $accountType->accountClass->scope;
            $accountClass = $accountType->accountClass;

            $accountTypeArray[$scope->name]
                             [$accountClass->name]
                             [$accountType->id] = $accountType->numberAndName();
        }

        return compact('openTargetsArray', 'projectsArray', 'accountTypeArray');
    }

    private function getCashbook($year) {
        $bookings = Booking::with('subBookings.accountType.accountClass.ioType',
                                  'subBookings.project')
            ->whereYear('date', '=', $year)
            ->orderBy('date')
            ->get()
            ->groupBy( function ($item) {
                return Carbon::parse($item->date)->format('n');
            });

        $sums = array();

        $startBalance = SubBooking::balanceAt($year - 1 . '-12-31');
        $sums[0]['balance'] = $startBalance;

        $expeditures = SubBooking::expedituresInInterval($year . '-01-01', $year . '-12-31', true);

        $incomes = SubBooking::incomesInInterval($year . '-01-01', $year . '-12-31', true);

        // Create an array with the following properties:
        //     'balance' - The account balance at the last day of a month
        //     'expeditures' - the sum of all expeditures in this month
        //     'incomes' - the sum of all incomes in this month plus the account
        //         balance of the previous month
        for ($month = 1; $month <= 12; $month++) {
            $currExpeditures = $expeditures->where('month', '=', $month)->first()->expeditures;

            $currIncomes = $expeditures->where('month', '<', $month)->sum('expeditures')
                + $incomes->where('month', '<=', $month)->sum('incomes')
                + $startBalance;

            $currBalance = $currExpeditures + $currIncomes;

            $sums[$month]['expeditures'] = $currExpeditures;
            $sums[$month]['incomes'] = $currIncomes;
            $sums[$month]['balance'] = $currBalance;
        }

        $firstDateString = Carbon::parse(Booking::firstDate());
        $firstDate['Y'] = $firstDateString->format('Y');
        $firstDate['m'] = $firstDateString->format('m');

        return compact('bookings', 'year', 'sums', 'firstDate');
    }
}