voting-contract.sol

import "@openzeppelin/contracts/access/Ownable.sol";

pragma solidity ^0.8.0;

contract Voting is Ownable{

    enum WorkflowStatus {
        RegisteringVoters,
        ProposalsRegistrationStarted,
        ProposalsRegistrationEnded,
        VotingSessionStarted,
        VotingSessionEnded,
        VotesTallied
    }

    WorkflowStatus public status; 
    uint public winningProposalId; 

    struct Voter {
        bool isRegistered;
        bool hasVoted;
        uint votedProposalId;
    }

    struct Proposal {
        string description;
        uint voteCount;
    }

    struct VoterProposal {
        string description;
        bool hasVoted;
    }

    mapping(address => VoterProposal) public voterProposals; 
    mapping(address => Voter) public voters; 
    mapping(address => address) public delegatedVotes; 
    
    Proposal[] public proposals; 

    event VoterRegistered(address voterAddress);
    
    event WorkflowStatusChange(WorkflowStatus previousStatus, WorkflowStatus newStatus);
    
    event ProposalRegistered(uint proposalId);
    
    event Voted(address voter, uint proposalId);

    constructor() Ownable(msg.sender) {
        status = WorkflowStatus.RegisteringVoters;
    }

    function registerVoter(address _voter) public onlyOwner {
        require(status == WorkflowStatus.RegisteringVoters, "Le vote n'est pas en cours d'inscription des votants.");
        require(!voters[_voter].isRegistered, "Le votant est deja inscrit.");
        voters[_voter].isRegistered = true;
        emit VoterRegistered(_voter);
    }

    function startProposalsRegistration() public onlyOwner {
        require(status == WorkflowStatus.RegisteringVoters, "Le vote n'est pas en cours d'inscription des votants.");
        
        status = WorkflowStatus.ProposalsRegistrationStarted;
        emit WorkflowStatusChange(WorkflowStatus.RegisteringVoters, WorkflowStatus.ProposalsRegistrationStarted);
    }

    function endProposalsRegistration() public onlyOwner {
        require(status == WorkflowStatus.ProposalsRegistrationStarted, "Le vote n'est pas en cours d'enregistrement des propositions.");
        
        status = WorkflowStatus.ProposalsRegistrationEnded;