<?php

namespace App\Http\Controllers\User;

use App\Attendance;
use App\Http\Controllers\Controller;
use App\Http\Controllers\UserCache;
use Illuminate\Http\Request;

use App\Subject;
use App\Classes;
use App\Room;

use Illuminate\Support\Facades\Auth;
use Illuminate\Support\Facades\DB;

class UserClassesController extends Controller
{
    public function index($groupBy='subject_id')
    {
        $user_id = Auth::id();
        $subjects = Subject::where('user_id', $user_id)->get();
        $subjects_ids = $subjects->pluck('id')->toArray();
        $classes = Classes::whereIn('subject_id', $subjects_ids)->orderBy('created_at','DESC')->get();
        foreach($classes as $classes_item) {
            $current_date = date('Y-m-d H:i:s');
            $classes_date = $classes_item->created_at;
            $hours_difference = checkHoursDifference($classes_date, $current_date);
            if ($hours_difference > 1.5 ) {
                $classes_item->classes_code = null;
                $classes_item->save();
                $classes_item->refresh();
            }
        }
        $classes_grouped = $classes->groupBy($groupBy);
        $defaultDate = date("Y-m-d");
        return view('user.user_classes', ['classes' => $classes, 'classes_grouped' => $classes_grouped, 'subjects' => $subjects, 'grouped_by' => $groupBy, 'defaultDate' => $defaultDate]);
    }

    public function add_classes(Request $request)
    {
        $subject_id = $request->input('subject_id');
        $date = $request->input('date');
        $test_mode = $request->input('test_mode');
        $classes_id =  Classes::create([
            'subject_id' => $subject_id,
            'date' => $date,
            'test_mode' => $test_mode
        ])->id;
        return redirect(route('user_start_classes', ['classes_id' => $classes_id]));
    }

    public function delete_classes($classes_id)
    {
        Classes::find($classes_id)->delete();
        return redirect()->back();
    }

    public function edit_classes($classes_id)
    {
        Classes::find($classes_id);
        return redirect()->back();
    }

    public function start_classes($classes_id)
    {
        $classes = Classes::find($classes_id);
        $classes_code = $classes->classes_code;
        if(!$classes_code){
            $classes_code = generateRandomString(10);
            $classes->classes_code = $classes_code;
            $classes->save();
            $classes->refresh();
        }

        $userCache = new UserCache();
        $cache = $userCache->get($classes_code);
        if($cache) {
            $student_id_number = $cache->index;
            $student_name = $cache->name;
            $student_surname = $cache->surname;
            $classes = DB::table("classes")->where("classes_code", $cache->classcode)->first();
            $attendances = Attendance::where('classes_id', $classes->id)->get();
            $seat_numbers = $attendances->pluck('seat_number')->toArray();
            $subject = Subject::find($classes->subject_id);

            if($classes->test_mode) {
                $room_capacity = Room::find($subject->room_id)->capacity;
                $random_seat = rand(1, $room_capacity);
                while(in_array($random_seat, $seat_numbers)) {
                    $random_seat = rand(1, $room_capacity);
                }
                Attendance::create([
                    'classes_id' => $classes->id,
                    'student_id_number' => $student_id_number,
                    'student_name' => $student_name,
                    'student_surname' => $student_surname,
                    'seat_number' => $random_seat
                ]);
                return view('map.summary_map', ['student_name' => $student_name, 'student_surname' => $student_surname, 'seat_number' => $random_seat, 'student_id_number' => $student_id_number, 'classes_id' => $classes->id]);
            }

            $room_arrangement = Room::find($subject->room_id)->arrangement;
            if(!$room_arrangement) {
                $room_arrangement = Room::where('name', 'Inna sala')->first()->arrangement;
            }
            $room_rows = count(explode("++", $room_arrangement));
            if($room_rows > 4) { //max 4 rows on one page
                $multi_parts = true;
                $parts_number = ceil($room_rows/4);
            } else {
                $multi_parts = false;
            }
            $userCache->delete($cache->classcode);
            return view('map.seat_map', ['student_name' => $student_name, 'student_surname' => $student_surname, 'student_id_number' => $student_id_number, 'classes_id' => $classes->id, 'seat_numbers' => $seat_numbers, 'room_arrangement' => $room_arrangement, 'multi_parts' => $multi_parts, 'parts_number' =>$parts_number]);
        }

        return view('map.start_map', ['classes_code' => $classes_code, 'classes' => $classes]);
    }

    public function start_classes_verified(Request $request)
    {
        $student_id_number = $request->input('student_id_number');
        $student_name = $request->input('student_name');
        $student_surname = $request->input('student_surname');
        $classes = Classes::find($request->get('classes_id'));
        $attendances = Attendance::where('classes_id', $classes->id)->get();
        $seat_numbers = $attendances->pluck('seat_number')->toArray();
        $subject = Subject::find($classes->subject_id);
        if($classes->test_mode) {
            $room_capacity = Room::find($subject->room_id)->capacity;
            $random_seat = rand(1, $room_capacity);
            while(in_array($random_seat, $seat_numbers))  {
                $random_seat = rand(1, $room_capacity);
            }
            Attendance::create([
                'classes_id' => $classes->id,
                'student_id_number' => $student_id_number,
                'student_name' => $student_name,
                'student_surname' => $student_surname,
                'seat_number' => $random_seat
            ]);
            return view('map.summary_map', ['student_name' => $student_name, 'student_surname' => $student_surname, 'seat_number' => $random_seat, 'student_id_number' => $student_id_number, 'classes_id' => $classes->id]);
        }
        $room_arrangement = Room::find($subject->room_id)->arrangement;
        if(!$room_arrangement) {
            $room_arrangement = Room::where('name', 'Inna sala')->first()->arrangement;
        }
        $room_rows = count(explode("++", $room_arrangement));
        if($room_rows > 4) {  //max 4 rows on one page
            $multi_parts = true;
            $parts_number = ceil($room_rows/4);
        } else {
            $multi_parts = false;
        }
        return view('map.seat_map', ['student_name' => $student_name, 'student_surname' => $student_surname, 'student_id_number' => $student_id_number, 'classes_id' => $classes->id, 'seat_numbers' => $seat_numbers, 'room_arrangement' => $room_arrangement, 'multi_parts' => $multi_parts, 'parts_number' =>$parts_number]);
    }

    public function save_classes_data(Request $request)
    {
        $classes_id = $request->input('classes_id');
        $student_id_number = $request->input('student_id_number');
        $student_name = $request->input('student_name');
        $student_surname = $request->input('student_surname');
        $seat_number = $request->input('seat_number');
        Attendance::create([
            'classes_id' => $classes_id,
            'student_id_number' => $student_id_number,
            'student_name' => $student_name,
            'student_surname' => $student_surname,
            'seat_number' => $seat_number
        ]);
        return view('map.summary_map', ['student_name' => $student_name, 'student_surname' => $student_surname, 'seat_number' => $seat_number, 'student_id_number' => $student_id_number, 'classes_id' => $classes_id]);
    }

    public function preview_classes($classes_id, $orderBy='student_surname', $orderDirection='ASC')
    {
        if(!$classes_id == 0) {
            $classes = Classes::find($classes_id);
            $attendances = Attendance::where('classes_id', $classes->id)->orderBy($orderBy,$orderDirection)->get();
            $seat_numbers = $attendances->pluck('seat_number')->toArray();
            $subject = Subject::find($classes->subject_id);
            $room_arrangement = Room::find($subject->room_id)->arrangement;
            if(!$room_arrangement) {
                $room_arrangement = Room::where('name', 'Inna sala')->first()->arrangement;
            }
            $room_rows = count(explode("++", $room_arrangement));
            if($room_rows > 4) {  //max 4 rows on one page
                $multi_parts = true;
                $parts_number = ceil($room_rows/4);
            } else {
                $multi_parts = false;
            }
        }
        return view('user.user_preview_classes', ['classes_id' => $classes_id, 'room_arrangement' => $room_arrangement, 'attendances' => $attendances, 'seat_numbers' => $seat_numbers, 'orderBy' => $orderBy, 'orderDirection' => $orderDirection, 'multi_parts' => $multi_parts, 'parts_number' =>$parts_number]);
    }
}