using System.Diagnostics;

namespace StellaOps.Policy.Registry.Telemetry;

/// <summary>
/// Activity source for Policy Registry tracing.
/// Provides distributed tracing capabilities for all registry operations.
/// </summary>
public static class PolicyRegistryActivitySource
{
    public const string SourceName = "StellaOps.Policy.Registry";

    public static readonly ActivitySource ActivitySource = new(SourceName, "1.0.0");

    // Pack operations
    public static Activity? StartCreatePack(string tenantId, string packName)
    {
        var activity = ActivitySource.StartActivity("policy_registry.pack.create", ActivityKind.Internal);
        activity?.SetTag("tenant_id", tenantId);
        activity?.SetTag("pack_name", packName);
        return activity;
    }

    public static Activity? StartGetPack(string tenantId, Guid packId)
    {
        var activity = ActivitySource.StartActivity("policy_registry.pack.get", ActivityKind.Internal);
        activity?.SetTag("tenant_id", tenantId);
        activity?.SetTag("pack_id", packId.ToString());
        return activity;
    }

    public static Activity? StartUpdatePack(string tenantId, Guid packId)
    {
        var activity = ActivitySource.StartActivity("policy_registry.pack.update", ActivityKind.Internal);
        activity?.SetTag("tenant_id", tenantId);
        activity?.SetTag("pack_id", packId.ToString());
        return activity;
    }

    public static Activity? StartDeletePack(string tenantId, Guid packId)
    {
        var activity = ActivitySource.StartActivity("policy_registry.pack.delete", ActivityKind.Internal);
        activity?.SetTag("tenant_id", tenantId);
        activity?.SetTag("pack_id", packId.ToString());
        return activity;
    }

    // Compilation operations
    public static Activity? StartCompile(string tenantId, Guid packId)
    {
        var activity = ActivitySource.StartActivity("policy_registry.compile", ActivityKind.Internal);
        activity?.SetTag("tenant_id", tenantId);
        activity?.SetTag("pack_id", packId.ToString());
        return activity;
    }

    public static Activity? StartValidateRule(string tenantId, string ruleId)
    {
        var activity = ActivitySource.StartActivity("policy_registry.rule.validate", ActivityKind.Internal);
        activity?.SetTag("tenant_id", tenantId);
        activity?.SetTag("rule_id", ruleId);
        return activity;
    }

    // Simulation operations
    public static Activity? StartSimulation(string tenantId, Guid packId)
    {
        var activity = ActivitySource.StartActivity("policy_registry.simulate", ActivityKind.Internal);
        activity?.SetTag("tenant_id", tenantId);
        activity?.SetTag("pack_id", packId.ToString());
        return activity;
    }

    public static Activity? StartBatchSimulation(string tenantId, Guid packId, int inputCount)
    {
        var activity = ActivitySource.StartActivity("policy_registry.batch_simulate", ActivityKind.Internal);
        activity?.SetTag("tenant_id", tenantId);
        activity?.SetTag("pack_id", packId.ToString());
        activity?.SetTag("input_count", inputCount);
        return activity;
    }

    // Review operations
    public static Activity? StartSubmitReview(string tenantId, Guid packId)
    {
        var activity = ActivitySource.StartActivity("policy_registry.review.submit", ActivityKind.Internal);
        activity?.SetTag("tenant_id", tenantId);
        activity?.SetTag("pack_id", packId.ToString());
        return activity;
    }

    public static Activity? StartApproveReview(string tenantId, string reviewId)
    {
        var activity = ActivitySource.StartActivity("policy_registry.review.approve", ActivityKind.Internal);
        activity?.SetTag("tenant_id", tenantId);
        activity?.SetTag("review_id", reviewId);
        return activity;
    }

    public static Activity? StartRejectReview(string tenantId, string reviewId)
    {
        var activity = ActivitySource.StartActivity("policy_registry.review.reject", ActivityKind.Internal);
        activity?.SetTag("tenant_id", tenantId);
        activity?.SetTag("review_id", reviewId);
        return activity;
    }

    // Publish operations
    public static Activity? StartPublish(string tenantId, Guid packId)
    {
        var activity = ActivitySource.StartActivity("policy_registry.publish", ActivityKind.Internal);
        activity?.SetTag("tenant_id", tenantId);
        activity?.SetTag("pack_id", packId.ToString());
        return activity;
    }

    public static Activity? StartRevoke(string tenantId, Guid packId)
    {
        var activity = ActivitySource.StartActivity("policy_registry.revoke", ActivityKind.Internal);
        activity?.SetTag("tenant_id", tenantId);
        activity?.SetTag("pack_id", packId.ToString());
        return activity;
    }

    public static Activity? StartVerifyAttestation(string tenantId, Guid packId)
    {
        var activity = ActivitySource.StartActivity("policy_registry.attestation.verify", ActivityKind.Internal);
        activity?.SetTag("tenant_id", tenantId);
        activity?.SetTag("pack_id", packId.ToString());
        return activity;
    }

    // Promotion operations
    public static Activity? StartPromotion(string tenantId, Guid packId, string targetEnvironment)
    {
        var activity = ActivitySource.StartActivity("policy_registry.promote", ActivityKind.Internal);
        activity?.SetTag("tenant_id", tenantId);
        activity?.SetTag("pack_id", packId.ToString());
        activity?.SetTag("target_environment", targetEnvironment);
        return activity;
    }

    public static Activity? StartRollback(string tenantId, string environment)
    {
        var activity = ActivitySource.StartActivity("policy_registry.rollback", ActivityKind.Internal);
        activity?.SetTag("tenant_id", tenantId);
        activity?.SetTag("environment", environment);
        return activity;
    }

    public static Activity? StartValidatePromotion(string tenantId, Guid packId, string targetEnvironment)
    {
        var activity = ActivitySource.StartActivity("policy_registry.promotion.validate", ActivityKind.Internal);
        activity?.SetTag("tenant_id", tenantId);
        activity?.SetTag("pack_id", packId.ToString());
        activity?.SetTag("target_environment", targetEnvironment);
        return activity;
    }

    // Helper methods
    public static void SetError(this Activity? activity, Exception ex)
    {
        if (activity is null) return;

        activity.SetStatus(ActivityStatusCode.Error, ex.Message);
        activity.SetTag("error.type", ex.GetType().FullName);
        activity.SetTag("error.message", ex.Message);
    }

    public static void SetSuccess(this Activity? activity)
    {
        activity?.SetStatus(ActivityStatusCode.Ok);
    }

    public static void SetResult(this Activity? activity, string key, object? value)
    {
        if (activity is null || value is null) return;
        activity.SetTag($"result.{key}", value.ToString());
    }
}