namespace w4c_workflows.Services.Execution;

/// <summary>
/// The result of executing one task. <see cref="Output"/> is always valid JSON
/// (a serialized value) or <c>null</c> when the task produced no output; the
/// control plane stores it directly into <c>task_runs.output jsonb</c>.
/// </summary>
public sealed record ExecutionResult(
    bool Success,
    int ExitCode,
    string Stdout,
    string Stderr,
    string? Output,
    string? Error,
    TimeSpan Duration);

/// <summary>
/// Serializes an <see cref="ExecutionResult"/> into the flat <c>task.result</c>
/// event fields the worker publishes back to the control plane.
/// </summary>
public static class TaskResultMessage
{
    public const string TypeValue = "task.result";

    public static IReadOnlyDictionary<string, string> ToFields(TaskInvocation invocation, ExecutionResult result)
    {
        var fields = new Dictionary<string, string>
        {
            ["type"] = TypeValue,
            ["run_id"] = invocation.RunId,
            ["task_id"] = invocation.TaskId,
            ["attempt"] = invocation.Attempt.ToString(System.Globalization.CultureInfo.InvariantCulture),
            ["tenant_id"] = invocation.TenantId,
            ["status"] = result.Success ? "succeeded" : "failed",
            ["exit_code"] = result.ExitCode.ToString(System.Globalization.CultureInfo.InvariantCulture),
            ["duration_ms"] = ((long)result.Duration.TotalMilliseconds).ToString(System.Globalization.CultureInfo.InvariantCulture),
        };

        if (result.Output != null)
            fields["output"] = result.Output;
        if (result.Error != null)
            fields["error"] = result.Error;

        return fields;
    }
}