<?php

declare(strict_types=1);

namespace App\Http\Middleware;

use Closure;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Schema;
use Symfony\Component\HttpFoundation\Response;

final class EnsureSchoolAccess
{
    public function handle(Request $request, Closure $next): Response
    {
        $user = $request->user();

        if (! $user) {
            abort(401);
        }

        $schoolId = $this->schoolIdFromRoute($request);

        if (! $schoolId) {
            abort(404);
        }

        if (! $this->userCanAccessSchool((int) $user->getAuthIdentifier(), $schoolId)) {
            abort(404);
        }

        return $next($request);
    }

    private function schoolIdFromRoute(Request $request): ?int
    {
        $school = $request->route('school');

        if (is_numeric($school)) {
            return (int) $school;
        }

        if (is_object($school) && isset($school->id)) {
            return (int) $school->id;
        }

        return null;
    }

    private function userCanAccessSchool(int $userId, int $schoolId): bool
    {
        if (Schema::hasTable('school_user')) {
            return DB::table('school_user')
                ->where('user_id', $userId)
                ->where('school_id', $schoolId)
                ->exists();
        }

        if (Schema::hasTable('school_users')) {
            return DB::table('school_users')
                ->where('user_id', $userId)
                ->where('school_id', $schoolId)
                ->exists();
        }

        if (Schema::hasTable('users') && Schema::hasColumn('users', 'school_id')) {
            return DB::table('users')
                ->where('id', $userId)
                ->where('school_id', $schoolId)
                ->exists();
        }

        return false;
    }
}