applicant-site/app/Http/Controllers/Api/CalculatorController.php

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<?php
namespace App\Http\Controllers\Api;
use App\Http\Controllers\Controller;
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use App\Models\Department;
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use App\Models\Direction;
use App\Models\EntranceExamination;
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use App\Models\Faculty;
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use Illuminate\Http\Request;
class CalculatorController extends Controller
{
public function findDirectionFromSubjects(Request $request)
{
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$getJSON = $request->input()['predmets'];
$getsSubjects = json_decode($getJSON);
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$countUserSubjects = count($getsSubjects);
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$filteredDirectionIds = EntranceExamination::all()
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->select("direction_id", "subject_id")
->groupBy('direction_id')
->map(function ($direction) {
return $direction->map(fn($item) => $item['subject_id']);
})
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->filter(fn($direction) => count($direction) <= $countUserSubjects)
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->keys();
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$directions = Direction::whereIn('id', $filteredDirectionIds)->get();
$generateHtml = function ($acc, $direction) {
$department = Department::find($direction->department_id);
$faculty = Faculty::find($department->faculty_id);
return "{$acc} <tr class=\"\">
<td id=\"faculty\"> {$faculty->name} </td>
<td> {$direction->name} </td>
<td class=\"text-end\"> {$direction->period} </td>
</tr>";
};
$html = $directions->reduce($generateHtml, '');
return response()->json(['html' => $html]);
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}
}