Member update endpoint can now change ownership

app/Service/MemberService.php

@@ -0,0 +1,61 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Service;
+
+use App\Enums\Role;
+use App\Models\Member;
+use App\Models\Organization;
+use App\Models\User;
+use InvalidArgumentException;
+
+class MemberService
+{
+    private UserService $userService;
+
+    public function __construct(UserService $userService)
+    {
+        $this->userService = $userService;
+    }
+
+    /**
+     * Change the ownership of an organization to a new user.
+     * The previous owner will be demoted to an admin.
+     */
+    public function changeOwnership(Organization $organization, Member $newOwner): void
+    {
+        $organization->update([
+            'user_id' => $newOwner->user_id,
+        ]);
+        if ($newOwner->organization_id !== $organization->getKey()) {
+            throw new InvalidArgumentException('Member is not part of the organization');
+        }
+        $newOwner->role = Role::Owner->value;
+        $newOwner->save();
+        $oldOwners = Member::query()
+            ->whereBelongsTo($organization, 'organization')
+            ->where('role', '=', Role::Owner->value)
+            ->where('id', '!=', $newOwner->getKey())
+            ->get();
+        foreach ($oldOwners as $oldOwner) {
+            $oldOwner->role = Role::Admin->value;
+            $oldOwner->save();
+        }
+    }
+
+    public function makeMemberToPlaceholder(Member $member): void
+    {
+        $user = $member->user;
+        $placeholderUser = $user->replicate();
+        $placeholderUser->is_placeholder = true;
+        $placeholderUser->save();
+
+        $member->user()->associate($placeholderUser);
+        $member->role = Role::Placeholder->value;
+        $member->save();
+
+        $this->userService->assignOrganizationEntitiesToDifferentMember($member->organization, $user, $placeholderUser, $member);
+        $this->userService->makeSureUserHasAtLeastOneOrganization($user);
+    }
+}