web-panel/routes/web.php

<?php

use App\ParkingLot;
use Google\Cloud\Firestore\FirestoreClient;

/*
|--------------------------------------------------------------------------
| Web Routes
|--------------------------------------------------------------------------
|
| Here is where you can register web routes for your application. These
| routes are loaded by the RouteServiceProvider within a group which
| contains the "web" middleware group. Now create something great!
|
*/

Route::get('/', function () {
    return view('welcome');
});

Auth::routes();

Route::get('/home', 'HomeController@index')->name('home');

Route::get('/lot/selectstalls', function() { return view('selectstalls'); } );

Route::get('/lot/add', function() { return view('lot.add'); } );
Route::post('/lot/post', function(\Illuminate\Http\Request $request) {
    /*$this->validate($request, [
        'image' => 'required|image|mimes:jpeg,png,jpg,gif,svg|max:4096',
    ]);*/

    if ( $request->hasFile('image') ){
        $img = $request->file('image');
        $name = time() . '.' . $img->getClientOriginalExtension();
        $destination_path = public_path('/img/references');
        $img->move($destination_path, $name);
//        $this->save();

        $lot_object = new ParkingLot([
            'firebase_id' => 'Lot',
            'stall_coordinates' => '',
            'reference_image' => $name,
            'number_of_columns' => $request->get('numcols'),
            'name' => $request->get('name')
        ]);
        $lot_object->save();

        $lot_object->firebase_id = 'Lot'.$lot_object->id;
        $lot_object->save();

        return view('selectstalls', [ 'image_name' => $name, 'lot_id' => $lot_object->id ]);
    }
});

Route::post('/lot/generate', function(\Illuminate\Http\Request $request){
    $lot_object = ParkingLot::find($request->get('lotid'));
    $lot_object->stall_coordinates = $request->get('coords');
    $lot_object->save();

    $coordgroup = json_decode($request->get('coords'));
    $coordarrs = [];
    foreach( $coordgroup as $group ){
        array_push($coordarrs, ['x'=>$group->x, 'y'=>$group->y, 'w'=>$group->w, 'h'=>$group->h]);
    }

//    var_dump($coordarrs);

    usort($coordarrs, function($a, $b){
        return $a['y'] <=> $b['y'];
    });

//    var_dump($coordarrs);

    $coordarrs_chunks = array_chunk($coordarrs, $lot_object->number_of_columns);

    foreach($coordarrs_chunks as $key=>$chunk ){
        usort($chunk, function($a, $b) {
            return $a['x'] <=> $b['x'];
        });
        $coordarrs_chunks[$key] = $chunk;
    }

    $stall_coords_1D = call_user_func_array('array_merge', $coordarrs_chunks);
    $lot_object->stall_coordinates = json_encode($stall_coords_1D);

//    dd([$coordarrs_chunks, $stall_coords_1D]);


    $db = new FirestoreClient();

    $doc_ref = $db->collection('lots')->document($lot_object->firebase_id);
    $doc_ref->set([]);

    $doc_ref = $db->collection('lots')->document($lot_object->firebase_id)->collection('info')->document('lotInfo');
    $doc_ref->set([
        'coordinates' => $lot_object->stall_coordinates,
        'lotID' => $lot_object->id,
        'refImage' => $lot_object->reference_image,
        'tableLayout' => '',
        'columns' => $lot_object->number_of_columns,
        'name' => $lot_object->name
    ]);

//    $coords = json_decode($lot_object->stall_coordinates);
    $stall_no = 1;
    foreach ($stall_coords_1D as $coord){
        $doc_ref = $db->collection('lots')->document($lot_object->firebase_id)->collection('stalls')->document('Stall-'.$stall_no);
        $doc_ref->set([
            'handicap' => false,
            'locationX' => $coord['x'],
            'locationY' => $coord['y'],
            'open' => true,
            'passID' => 0,
            'width' => $coord['w'],
            'height' => $coord['h'],
            'stall' => $stall_no,
        ]);

        $stall_no += 1;
    }



    echo $request->get('coords');
});