Persistence Ignorance - Voting Domain Model

Voting.cs

using PersistenceIgnorance.Domain.Voting.Events;

namespace PersistenceIgnorance.Domain.Voting;

public class Voting(List<Voter> voters)
{
    private readonly List<Voter> _voters = voters;
    private readonly List<IEvent> _events = [];

    private bool IsStarted { get; set; }
    private bool IsClosed { get; set; }

    public Voting(List<Voter> voters, bool isStarted, bool isClosed) : this(voters)
    {
        _voters = voters;
        
        IsStarted = isStarted;
        IsClosed = isClosed;
    }
    
    public void AddVoter(int identityNumber)
    {
        if (IsStarted)
            throw new InvalidOperationException("The voting has started.");
        
        if (IsClosed)
            throw new InvalidOperationException("The voting has closed.");

        if (_voters.Any(v => v.IdentityNumber == identityNumber))
            throw new InvalidOperationException("The voter has already exists.");

        _voters.Add(new Voter(identityNumber));

        _events.Add(new VoterAdded(identityNumber));
    }

    public void RemoveVoter(int identityNumber)
    {
        if (IsStarted)
            throw new InvalidOperationException("The voting has started.");
        
        if (IsClosed)
            throw new InvalidOperationException("The voting has closed.");
        
        var voter = _voters.FirstOrDefault(v => v.IdentityNumber == identityNumber);
        
        if (voter == null)
            throw new InvalidOperationException("The voter has not found.");

        _voters.Remove(voter);

        _events.Add(new VoterRemoved(identityNumber));
    }

    public void Start()
    {
        if (IsStarted)
            throw new InvalidOperationException("The voting has started.");
        
        if (IsClosed)
            throw new InvalidOperationException("The voting has closed.");
        
        _events.Add(new VotingStarted(DateTimeOffset.Now));
    }
    
    public void Close()
    {
        if (IsClosed)
            throw new InvalidOperationException("The voting has closed.");
        
        if (!IsStarted)
            throw new InvalidOperationException("The voting has not started.");
        
        if (_voters.Any(v => v.Status == VotingStatus.Waiting))
            throw new InvalidOperationException("There are those who don't vote.");
        
        _events.Add(new VotingClosed(DateTimeOffset.Now));
    }

    public void Approve(int identityNumber)
    {
        if (IsClosed)
            throw new InvalidOperationException("The voting has closed.");
     
        if (!IsStarted)
            throw new InvalidOperationException("The voting has not started.");
        
        var voter = _voters.FirstOrDefault(v => v.IdentityNumber == identityNumber);

        if (voter == null)
            throw new InvalidOperationException("The voter has not found.");
        
        if (voter.Status != VotingStatus.Waiting)
            throw new InvalidOperationException("The voter has already made his choice.");

        voter.ChangeStatus(VotingStatus.Approved);

        _events.Add(new VoterApproved(identityNumber, DateTimeOffset.Now));
    }

    public void Reject(int identityNumber)
    {
        if (IsClosed)
            throw new InvalidOperationException("The voting has closed.");
     
        if (!IsStarted)
            throw new InvalidOperationException("The voting has not started.");
        
        var voter = _voters.FirstOrDefault(v => v.IdentityNumber == identityNumber);

        if (voter == null)
            throw new InvalidOperationException("The voter has not found.");
        
        if (voter.Status != VotingStatus.Waiting)
            throw new InvalidOperationException("The voter has already made his choice.");

        voter.ChangeStatus(VotingStatus.Rejected);

        _events.Add(new VoterRejected(identityNumber, DateTimeOffset.Now));
    }

    public IReadOnlyCollection<IEvent> GetEvents => _events.AsReadOnly();
}