Moderation

  moderation: sui::table::Table<address, u8>

  public fun assert_is_moderator(
      moderation: &Moderation,
      user: address
  ) {
      let is_moderator = is_moderator(
          moderation,
          user
      );

      assert!(is_moderator, EIsNotModerator);
  }

  public fun assert_is_owner(
      moderation: &Moderation,
      user: address
  ) {
      let is_owner = is_owner(
          moderation,
          user
      );

      assert!(is_owner, EIsNotOwner);
  }

  public fun create(
      ctx: &mut TxContext
  ): (Moderation, u8, u8) {
      let self = tx_context::sender(ctx);

      let mut moderation = Moderation {
          moderation: table::new(ctx)
      };

      let (event, message) = make_owner(
          &mut moderation,
          self
      );

      (moderation, event, message)
  }

  public fun get_length(
      moderation: &Moderation
  ): u64 {
      moderation.moderation.length()
  }

  public fun is_moderator(
      moderation: &Moderation,
      user: address
  ): bool {
      moderation.moderation.contains(user)
  }

  public fun is_owner(
      moderation: &Moderation,
      user: address
  ): bool {
      let is_moderator = is_moderator(
          moderation,
          user
      );

      if (!is_moderator) {
          false
      } else {
          moderation.moderation[user] == OWNER
      }
  }

  public fun make_moderator(
      moderation: &mut Moderation,
      user: address
  ): (u8, u8) {
      moderation.moderation.add(
          user,
          MODERATOR
      );

      (MODERATOR_ADD, MODERATOR)
  }

  public fun make_owner(
      moderation: &mut Moderation,
      user: address
  ): (u8, u8) {
      moderation.moderation.add(
          user,
          OWNER
      );

      (MODERATOR_ADD, OWNER)
  }

  public fun remove_moderator(
      moderation: &mut Moderation,
      user: address
  ): (u8, u8) {
      let is_owner = is_owner(
          moderation,
          user
      );

      assert!(!is_owner, EIsOwner);

      moderation.moderation.remove(user);

      (MODERATOR_REMOVE, MODERATOR)
  }