// SPDX-License-Identifier: MIT
pragma solidity ^0.8.30;
contract StatryxStatus {
    struct Status { string message; uint64 updatedAt; uint64 revision; }
    mapping(address => Status) private states;
    event StatusUpdated(address indexed account, string message, uint64 revision);
    function updateStatus(string calldata message) external {
        bytes memory m = bytes(message);
        require(m.length <= 140, "Maximum 140 bytes");
        require(keccak256(m) != keccak256(bytes(states[msg.sender].message)), "No change");
        Status storage s = states[msg.sender];
        s.message = message;
        s.updatedAt = uint64(block.timestamp);
        s.revision++;
        emit StatusUpdated(msg.sender, message, s.revision);
    }
    function statusOf(address account) external view returns (Status memory) { return states[account]; }
}