feat: I can delete my account easily (#977)

* Add support for account deletion

Co-authored-by: v1b3m <vibenjamin6@gmail.com>

* Add more fixes

Co-authored-by: Benjamin Mayanja <vibenjamin6@gmail.com>

* Add more fixes

Co-authored-by: v1b3m <vibenjamin6@gmail.com>

---------

Co-authored-by: v1b3m <vibenjamin6@gmail.com>

server/src/core/user/user.service.ts

@@ -91,4 +91,89 @@ export class UserService {
 
     return user as Prisma.UserGetPayload<T>;
   }
+
+  async deleteUser({
+    workspaceId,
+    userId,
+  }: {
+    workspaceId: string;
+    userId: string;
+  }) {
+    const {
+      workspaceMember,
+      company,
+      comment,
+      attachment,
+      refreshToken,
+      activity,
+      activityTarget,
+    } = this.prismaService.client;
+    const user = await this.findUnique({
+      where: {
+        id: userId,
+      },
+      select: {
+        id: true,
+      },
+    });
+    assert(user, 'User not found');
+
+    const workspace = await this.workspaceService.findUnique({
+      where: { id: workspaceId },
+      select: { id: true },
+    });
+    assert(workspace, 'Workspace not found');
+
+    const workSpaceMembers = await workspaceMember.findMany({
+      where: {
+        workspaceId,
+      },
+    });
+
+    const isLastMember =
+      workSpaceMembers.length === 1 && workSpaceMembers[0].userId === userId;
+
+    if (isLastMember) {
+      // Delete entire workspace
+      await this.workspaceService.deleteWorkspace({
+        workspaceId,
+        userId,
+        select: { id: true },
+      });
+    } else {
+      const where = { authorId: userId };
+      const activities = await activity.findMany({
+        where,
+      });
+
+      await this.prismaService.client.$transaction([
+        workspaceMember.deleteMany({
+          where: { userId },
+        }),
+        company.deleteMany({
+          where: { accountOwnerId: userId },
+        }),
+        comment.deleteMany({
+          where,
+        }),
+        attachment.deleteMany({
+          where,
+        }),
+        refreshToken.deleteMany({
+          where: { userId },
+        }),
+        ...activities.map(({ id: activityId }) =>
+          activityTarget.deleteMany({
+            where: { activityId },
+          }),
+        ),
+        activity.deleteMany({
+          where,
+        }),
+        this.delete({ where: { id: userId } }),
+      ]);
+    }
+
+    return user;
+  }
 }