// SPDX-License-Identifier: MIT
pragma solidity ^0.8.30;
contract ClustoraRoster {
    uint256 public constant MAX_GROUPS = 32;
    uint256 public constant MAX_MEMBERS = 10000;
    mapping(uint256 => mapping(address => bool)) public isMember;
    mapping(uint256 => uint256) public memberCount;
    event MembershipChanged(uint256 indexed group, address indexed account, bool active);
    function join(uint256 group) external {
        require(group > 0 && group <= MAX_GROUPS, "Unknown group");
        require(!isMember[group][msg.sender], "Already joined");
        require(memberCount[group] < MAX_MEMBERS, "Group full");
        isMember[group][msg.sender] = true;
        memberCount[group]++;
        emit MembershipChanged(group, msg.sender, true);
    }
    function leave(uint256 group) external {
        require(isMember[group][msg.sender], "Not a member");
        isMember[group][msg.sender] = false;
        memberCount[group]--;
        emit MembershipChanged(group, msg.sender, false);
    }
}