using System.Text.Json.Serialization;

namespace StellaOps.PolicyAuthoritySignals.Contracts;

public sealed record PolicyContract
{
    private string _policyId = string.Empty;

    [JsonPropertyName("policyId")]
    public string PolicyId
    {
        get => _policyId;
        init => _policyId = RequireNonEmpty(value, nameof(PolicyId));
    }

    [JsonPropertyName("version")]
    public string Version { get; init; } = "0.1-draft";

    [JsonPropertyName("rulesHash")]
    public string? RulesHash { get; init; }

    public PolicyContract(string policyId, string? version = null, string? rulesHash = null)
    {
        PolicyId = policyId;
        if (!string.IsNullOrWhiteSpace(version))
        {
            Version = version;
        }

        RulesHash = rulesHash;
    }

    private static string RequireNonEmpty(string value, string paramName)
    {
        if (string.IsNullOrWhiteSpace(value))
        {
            throw new ArgumentException("Value cannot be null or whitespace.", paramName);
        }

        return value;
    }
}