<?php

namespace App\Http\Middleware;

use App\Http\Resources\UserTypePermissionResource;
use Closure;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Auth;
use App\Services\UserTypePermissionService;

class CheckPermission
{
    public function __construct(
        protected UserTypePermissionService $userTypePermissionService,
    ) {}

    /**
     * Handle an incoming request.
     *
     * @param \Illuminate\Http\Request $request
     * @param \Closure $next
     * @param string $scopes A string of scopes separated by '|' to check a single permission against.
     * @param string $permissionType The type of permission to check for each scope.
     * @return \Symfony\Component\HttpFoundation\Response
     */
    public function handle(Request $request, Closure $next, string $scopes, string $permissionType)
    {
        $user = Auth::user();
        // Get permissions for the user or guest
        if (!$user) {
            $userPermissions = UserTypePermissionResource::collection(resource: $this->userTypePermissionService->allGuestPermissions());
        } else {
            $userPermissions = UserTypePermissionResource::collection(resource: $this->userTypePermissionService->allPermissionsByUserType(userType: $user->type));
        }

        // Check the required permission for each scope
        $hasPermission = false;
        foreach (explode(separator: '|', string: $scopes) as $scope) {
            if ($this->hasPermission(userPermissions: $userPermissions, scope: $scope, permissionType: $permissionType)) {
                $hasPermission = true;
                break;
            }
        }

        if (!$hasPermission) {
            return response()->json(data: ['message' => 'Unauthorized'], status: 403);
        }

        return $next($request);
    }

    private function hasPermission($userPermissions, string $scope, string $permissionType): bool
    {
        $bitwisePermissionTable = [
            'view' => 1,
            'add' => 2,
            'edit' => 4,
            'delete' => 8,
            'print' => 16,
            'export' => 32,
            'import' => 64,
            'limit' => 128,
            'menu' => 256,
        ];

        $requiredPermission = $bitwisePermissionTable[$permissionType] ?? 0;

        foreach ($userPermissions as $permission) {
            if ($permission['scope'] === $scope && ($permission['bits'] & $requiredPermission)) {
                return true;
            }
        }

        return false;
    }
}