using TarninaHub.Domain.Enums;

namespace TarninaHub.Domain.Rules;

public static class SubmissionWorkflow
{
    private static readonly IReadOnlyDictionary<SubmissionStatus, SubmissionStatus[]> Transitions =
        new Dictionary<SubmissionStatus, SubmissionStatus[]>
        {
            [SubmissionStatus.New] = [SubmissionStatus.Triaged, SubmissionStatus.Rejected],
            [SubmissionStatus.Triaged] = [SubmissionStatus.Matched, SubmissionStatus.Rejected, SubmissionStatus.Closed],
            [SubmissionStatus.Matched] = [SubmissionStatus.InProgress, SubmissionStatus.Closed, SubmissionStatus.Rejected],
            [SubmissionStatus.InProgress] = [SubmissionStatus.Closed, SubmissionStatus.Rejected],
            [SubmissionStatus.Closed] = [],
            [SubmissionStatus.Rejected] = [],
        };

    public static bool CanTransition(SubmissionStatus from, SubmissionStatus to) =>
        from == to || Transitions[from].Contains(to);

    public static IReadOnlyList<SubmissionStatus> NextStates(SubmissionStatus from) =>
        Transitions[from];

    public static bool IsTerminal(SubmissionStatus status) =>
        Transitions[status].Length == 0;
}