Create the Foundation Members Contract about governance-token-contracts HOT 3 OPEN

enum Role { Research, Technical, FoundationMember }

using ECDSA for bytes32;

struct CommitteeMember {
    address addr;
    Role role;
    bytes32 sessionKeyShare; // Session key share for role rotation
    bool hasSessionKey; // To track if the committee member has a session key
}

struct Proposal {
    address addr; // Address of the council member
    uint proposalIndex; // Index of the proposal
}

mapping(address => CommitteeMember) public committeeMembers;
Proposal[] public proposals;
address public owner; // Contract owner

uint public lastRotationBlock; // Block number when the last rotation occurred
uint public rotationThreshold = 5; // Number of blocks before a rotation is initiated

modifier onlyOwner() {
    require(msg.sender == owner, "Only the owner can call this function.");
    _;
}

event NewChainInitiated(address[] newCouncilMembers);

constructor(address[] memory researchMembers, address[] memory technicalMembers, address[] memory foundationMembers) {
    owner = msg.sender; // Set the contract owner
    
    // Initialize committee members and their roles
    for (uint i = 0; i < researchMembers.length; i++) {
        committeeMembers[researchMembers[i]] = CommitteeMember(researchMembers[i], Role.Research, bytes32(0), false);
    }
    for (uint i = 0; i < technicalMembers.length; i++) {
        committeeMembers[technicalMembers[i]] = CommitteeMember(technicalMembers[i], Role.Technical, bytes32(0), false);
    }
    for (uint i = 0; i < foundationMembers.length; i++) {
        committeeMembers[foundationMembers[i]] = CommitteeMember(foundationMembers[i], Role.FoundationMember, bytes32(0), false);
    }
}

// Function to initiate a new chain and rotate council members
function initiateNewChain(address[] memory newCouncilMembers) public onlyOwner {
    // Destroy existing session keys
    for (uint i = 0; i < newCouncilMembers.length; i++) {
        committeeMembers[newCouncilMembers[i]].hasSessionKey = false;
        committeeMembers[newCouncilMembers[i]].sessionKeyShare = bytes32(0);
    }
    // Generate and set new session key shares for new council members
    for (uint i = 0; i < newCouncilMembers.length; i++) {
        committeeMembers[newCouncilMembers[i]].sessionKeyShare = generateSessionKeyShare();
        committeeMembers[newCouncilMembers[i]].hasSessionKey = true;
    }
    // Update the last rotation block
    lastRotationBlock = block.number;
    // Emit an event indicating a new chain initiation
    emit NewChainInitiated(newCouncilMembers);
}

// Function to generate session key share using ECDSA
function generateSessionKeyShare() private view returns (bytes32) {
    bytes32 msgHash = keccak256(abi.encodePacked(msg.sender));
    return msgHash.toEthSignedMessageHash().recover(msgHash);
}

// Function to change committee members' roles using session keys
function changeMembersUsingSessionKeys() public {
    require(committeeMembers[msg.sender].addr != address(0), "You are not a committee member.");
    
    // Check if it's time to initiate a rotation
    if (block.number - lastRotationBlock >= rotationThreshold) {
        // Rotate committee members' roles using session keys
        rotateRolesUsingSessionKeys();
        
        // Update the last rotation block
        lastRotationBlock = block.number;
    } else {
        revert("Rotation not yet due.");
    }
}

// Function to rotate committee members' roles using session keys
function rotateRolesUsingSessionKeys() private {
    address[] memory councilMembers = getCouncilMembers();
    
    for (uint i = 0; i < councilMembers.length; i++) {
        CommitteeMember storage member = committeeMembers[councilMembers[i]];
        
        if (member.hasSessionKey) {
            Role newRole = computeNewRole(member);
            member.role = newRole;
        }
    }
}

// Function to get the list of council members
function getCouncilMembers() private view returns (address[] memory) {
    uint n = 0;
    for (uint i = 0; i < proposals.length; i++) {
        if (committeeMembers[proposals[i].addr].hasSessionKey) {
            n++;
        }
    }
    address[] memory councilMembers = new address[](n);
    uint index = 0;
    for (uint i = 0; i < proposals.length; i++) {
        if (committeeMembers[proposals[i].addr].hasSessionKey) {
            councilMembers[index] = proposals[i].addr;
            index++;
        }
    }
    return councilMembers;
}

// Function to compute the new role based on session key
function computeNewRole(CommitteeMember memory member) private view returns (Role) {
    // Simulate a more sophisticated role computation using session key
    bytes32 keyHash = keccak256(abi.encodePacked(member.sessionKeyShare));
    uint randValue = uint(keyHash) % 100; // Assuming 100 roles (Research, Technical, FoundationMember)
    if (randValue < 33) {
        return Role.Research;
    } else if (randValue < 66) {
        return Role.Technical;
    } else {
        return Role.FoundationMember;
    }
}