using System;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Globalization;
using System.Security.Claims;
using System.Text;
using System.Text.Json;
using System.Text.Json.Nodes;
using System.Threading;
using System.Threading.RateLimiting;
using Microsoft.AspNetCore.Authentication;
using Microsoft.AspNetCore.Authentication.JwtBearer;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.RateLimiting;
using Microsoft.Extensions.Options;
using Microsoft.IdentityModel.Tokens;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Primitives;
using Serilog;
using Serilog.Events;
using StellaOps.Auth.ServerIntegration;
using StellaOps.Configuration;
using System.Collections.Immutable;
using StellaOps.Notify.Models;
using StellaOps.Notify.Storage.Postgres;
using StellaOps.Notify.Storage.Postgres.Models;
using StellaOps.Notify.Storage.Postgres.Repositories;
using StellaOps.Notify.WebService.Diagnostics;
using StellaOps.Notify.WebService.Extensions;
using StellaOps.Notify.WebService.Hosting;
using StellaOps.Notify.WebService.Options;
using StellaOps.Notify.WebService.Plugins;
using StellaOps.Notify.WebService.Security;
using StellaOps.Notify.WebService.Services;
using StellaOps.Notify.WebService.Internal;
using StellaOps.Plugin.DependencyInjection;
using StellaOps.Notify.WebService.Contracts;

var builder = WebApplication.CreateBuilder(args);

builder.Configuration.AddStellaOpsDefaults(options =>
{
    options.BasePath = builder.Environment.ContentRootPath;
    options.EnvironmentPrefix = "NOTIFY_";
    options.ConfigureBuilder = configurationBuilder =>
    {
        configurationBuilder.AddNotifyYaml(Path.Combine(builder.Environment.ContentRootPath, "../etc/notify.yaml"));
    };
});

var contentRootPath = builder.Environment.ContentRootPath;

var bootstrapOptions = builder.Configuration.BindOptions<NotifyWebServiceOptions>(
    NotifyWebServiceOptions.SectionName,
    (opts, _) =>
    {
        NotifyWebServiceOptionsPostConfigure.Apply(opts, contentRootPath);
        NotifyWebServiceOptionsValidator.Validate(opts);
    });

builder.Services.AddOptions<NotifyWebServiceOptions>()
    .Bind(builder.Configuration.GetSection(NotifyWebServiceOptions.SectionName))
    .PostConfigure(options =>
    {
        NotifyWebServiceOptionsPostConfigure.Apply(options, contentRootPath);
        NotifyWebServiceOptionsValidator.Validate(options);
    })
    .ValidateOnStart();

builder.Host.UseSerilog((context, services, loggerConfiguration) =>
{
    var minimumLevel = MapLogLevel(bootstrapOptions.Telemetry.MinimumLogLevel);

    loggerConfiguration
        .MinimumLevel.Is(minimumLevel)
        .MinimumLevel.Override("Microsoft.AspNetCore", LogEventLevel.Warning)
        .Enrich.FromLogContext()
        .WriteTo.Console();
});

builder.Services.AddSingleton(TimeProvider.System);
builder.Services.AddSingleton<ServiceStatus>();
builder.Services.AddSingleton<NotifySchemaMigrationService>();

// PostgreSQL is the canonical Notify storage; enable Postgres-backed repositories.
builder.Services.AddNotifyPostgresStorage(builder.Configuration, sectionName: "Postgres:Notify");

var pluginHostOptions = NotifyPluginHostFactory.Build(bootstrapOptions, contentRootPath);
builder.Services.AddSingleton(pluginHostOptions);
builder.Services.RegisterPluginRoutines(builder.Configuration, pluginHostOptions);
builder.Services.AddSingleton<INotifyPluginRegistry, NotifyPluginRegistry>();
builder.Services.AddSingleton<INotifyChannelTestService, NotifyChannelTestService>();
builder.Services.AddSingleton<INotifyChannelHealthService, NotifyChannelHealthService>();

ConfigureAuthentication(builder, bootstrapOptions);
ConfigureRateLimiting(builder, bootstrapOptions);

builder.Services.AddEndpointsApiExplorer();

var app = builder.Build();

var readyStatus = app.Services.GetRequiredService<ServiceStatus>();

var resolvedOptions = app.Services.GetRequiredService<IOptions<NotifyWebServiceOptions>>().Value;
await InitialiseAsync(app.Services, readyStatus, app.Logger, resolvedOptions);

ConfigureRequestPipeline(app, bootstrapOptions);
ConfigureEndpoints(app);

await app.RunAsync();

static void ConfigureAuthentication(WebApplicationBuilder builder, NotifyWebServiceOptions options)
{
    if (options.Authority.Enabled)
    {
        builder.Services.AddStellaOpsResourceServerAuthentication(
            builder.Configuration,
            configurationSection: null,
            configure: resourceOptions =>
            {
                resourceOptions.Authority = options.Authority.Issuer;
                resourceOptions.RequireHttpsMetadata = options.Authority.RequireHttpsMetadata;
                resourceOptions.MetadataAddress = options.Authority.MetadataAddress;
                resourceOptions.BackchannelTimeout = TimeSpan.FromSeconds(options.Authority.BackchannelTimeoutSeconds);
                resourceOptions.TokenClockSkew = TimeSpan.FromSeconds(options.Authority.TokenClockSkewSeconds);

                resourceOptions.Audiences.Clear();
                foreach (var audience in options.Authority.Audiences)
                {
                    resourceOptions.Audiences.Add(audience);
                }
            });

        builder.Services.AddAuthorization(auth =>
        {
            auth.AddStellaOpsScopePolicy(NotifyPolicies.Viewer, options.Authority.ViewerScope);
            auth.AddPolicy(
                NotifyPolicies.Operator,
                policy => policy
                    .RequireAuthenticatedUser()
                    .RequireAssertion(ctx =>
                        HasScope(ctx.User, options.Authority.OperatorScope) ||
                        HasScope(ctx.User, options.Authority.AdminScope)));
            auth.AddStellaOpsScopePolicy(NotifyPolicies.Admin, options.Authority.AdminScope);
        });
    }
    else
    {
        if (options.Authority.AllowAnonymousFallback)
        {
            builder.Services.AddAuthentication(authOptions =>
            {
                authOptions.DefaultAuthenticateScheme = AllowAllAuthenticationHandler.SchemeName;
                authOptions.DefaultChallengeScheme = AllowAllAuthenticationHandler.SchemeName;
            }).AddScheme<AuthenticationSchemeOptions, AllowAllAuthenticationHandler>(
                AllowAllAuthenticationHandler.SchemeName,
                static _ => { });

            builder.Services.AddAuthorization(auth =>
            {
                auth.AddPolicy(
                    NotifyPolicies.Viewer,
                    policy => policy.RequireAssertion(_ => true));

                auth.AddPolicy(
                    NotifyPolicies.Operator,
                    policy => policy.RequireAssertion(_ => true));

                auth.AddPolicy(
                    NotifyPolicies.Admin,
                    policy => policy.RequireAssertion(_ => true));
            });
        }
        else
        {
            builder.Services.AddAuthentication(JwtBearerDefaults.AuthenticationScheme)
                .AddJwtBearer(jwt =>
                {
                    jwt.RequireHttpsMetadata = false;
                    jwt.IncludeErrorDetails = true;
                    jwt.TokenValidationParameters = new TokenValidationParameters
                    {
                        ValidateIssuer = true,
                        ValidIssuer = options.Authority.Issuer,
                        ValidateAudience = options.Authority.Audiences.Count > 0,
                        ValidAudiences = options.Authority.Audiences,
                        ValidateIssuerSigningKey = true,
                        IssuerSigningKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(options.Authority.DevelopmentSigningKey!)),
                        ValidateLifetime = true,
                        ClockSkew = TimeSpan.FromSeconds(options.Authority.TokenClockSkewSeconds),
                        NameClaimType = ClaimTypes.Name
                    };
                });

            builder.Services.AddAuthorization(auth =>
            {
                auth.AddPolicy(
                    NotifyPolicies.Viewer,
                    policy => policy
                        .RequireAuthenticatedUser()
                        .RequireAssertion(ctx =>
                            HasScope(ctx.User, options.Authority.ViewerScope) ||
                            HasScope(ctx.User, options.Authority.OperatorScope) ||
                            HasScope(ctx.User, options.Authority.AdminScope)));

                auth.AddPolicy(
                    NotifyPolicies.Operator,
                    policy => policy
                        .RequireAuthenticatedUser()
                        .RequireAssertion(ctx =>
                            HasScope(ctx.User, options.Authority.OperatorScope) ||
                            HasScope(ctx.User, options.Authority.AdminScope)));

                auth.AddPolicy(
                    NotifyPolicies.Admin,
                    policy => policy
                        .RequireAuthenticatedUser()
                        .RequireAssertion(ctx => HasScope(ctx.User, options.Authority.AdminScope)));
            });
        }
    }
}

static void ConfigureRateLimiting(WebApplicationBuilder builder, NotifyWebServiceOptions options)
{
    ArgumentNullException.ThrowIfNull(options);
    var tenantHeader = options.Api.TenantHeader;
    var limits = options.Api.RateLimits;

    builder.Services.AddRateLimiter(rateLimiterOptions =>
    {
        rateLimiterOptions.RejectionStatusCode = StatusCodes.Status429TooManyRequests;
        rateLimiterOptions.OnRejected = static (context, _) =>
        {
            context.HttpContext.Response.Headers.TryAdd("Retry-After", "1");
            return ValueTask.CompletedTask;
        };

        ConfigurePolicy(rateLimiterOptions, NotifyRateLimitPolicies.DeliveryHistory, limits.DeliveryHistory, tenantHeader, "deliveries");
        ConfigurePolicy(rateLimiterOptions, NotifyRateLimitPolicies.TestSend, limits.TestSend, tenantHeader, "channel-test");
    });

    static void ConfigurePolicy(
        RateLimiterOptions rateLimiterOptions,
        string policyName,
        NotifyWebServiceOptions.RateLimitPolicyOptions policy,
        string tenantHeader,
        string prefix)
    {
        rateLimiterOptions.AddPolicy(policyName, httpContext =>
        {
            if (policy is null || !policy.Enabled)
            {
                return RateLimitPartition.GetNoLimiter("notify-disabled");
            }

            var identity = ResolveIdentity(httpContext, tenantHeader, prefix);

            return RateLimitPartition.GetTokenBucketLimiter(identity, _ => new TokenBucketRateLimiterOptions
            {
                TokenLimit = policy.TokenLimit,
                TokensPerPeriod = policy.TokensPerPeriod,
                ReplenishmentPeriod = TimeSpan.FromSeconds(policy.ReplenishmentPeriodSeconds),
                QueueLimit = policy.QueueLimit,
                QueueProcessingOrder = QueueProcessingOrder.OldestFirst,
                AutoReplenishment = true
            });
        });
    }

    static string ResolveIdentity(HttpContext httpContext, string tenantHeader, string prefix)
    {
        var tenant = httpContext.Request.Headers.TryGetValue(tenantHeader, out var header) && !StringValues.IsNullOrEmpty(header)
            ? header.ToString().Trim()
            : "anonymous";

        var subject = httpContext.User.FindFirst("sub")?.Value
            ?? httpContext.User.Identity?.Name
            ?? httpContext.Connection.RemoteIpAddress?.ToString()
            ?? "anonymous";

        return string.Concat(prefix, ':', tenant, ':', subject);
    }
}

static async Task InitialiseAsync(IServiceProvider services, ServiceStatus status, Microsoft.Extensions.Logging.ILogger logger, NotifyWebServiceOptions options)
{
    var stopwatch = Stopwatch.StartNew();

    try
    {
        await using var scope = services.CreateAsyncScope();
        var registry = scope.ServiceProvider.GetRequiredService<INotifyPluginRegistry>();
        var count = await registry.WarmupAsync();

        stopwatch.Stop();
        status.RecordReadyCheck(success: true, stopwatch.Elapsed);
        logger.LogInformation("Notify WebService initialised in {ElapsedMs} ms; loaded {PluginCount} plug-in(s).", stopwatch.Elapsed.TotalMilliseconds, count);
    }
    catch (Exception ex)
    {
        stopwatch.Stop();
        status.RecordReadyCheck(success: false, stopwatch.Elapsed, ex.Message);
        logger.LogError(ex, "Failed to initialise Notify WebService.");
        throw;
    }
}

static void ConfigureRequestPipeline(WebApplication app, NotifyWebServiceOptions options)
{
    if (options.Telemetry.EnableRequestLogging)
    {
        app.UseSerilogRequestLogging(c =>
        {
            c.IncludeQueryInRequestPath = true;
            c.GetLevel = (_, _, exception) => exception is null ? LogEventLevel.Information : LogEventLevel.Error;
        });
    }

    app.UseAuthentication();
    app.UseRateLimiter();
    app.UseAuthorization();
}

static void ConfigureEndpoints(WebApplication app)
{
    app.MapGet("/healthz", () => Results.Ok(new { status = "ok" }));

    app.MapGet("/readyz", (ServiceStatus status) =>
    {
        var snapshot = status.CreateSnapshot();
        if (snapshot.Ready.IsReady)
        {
            return Results.Ok(new
            {
                status = "ready",
                checkedAt = snapshot.Ready.CheckedAt,
                latencyMs = snapshot.Ready.Latency?.TotalMilliseconds,
                snapshot.StartedAt
            });
        }

        return JsonResponse(
            new
            {
                status = "unready",
                snapshot.Ready.Error,
                checkedAt = snapshot.Ready.CheckedAt,
                latencyMs = snapshot.Ready.Latency?.TotalMilliseconds
            },
            StatusCodes.Status503ServiceUnavailable);
    });

    var options = app.Services.GetRequiredService<IOptions<NotifyWebServiceOptions>>().Value;
    var tenantHeader = options.Api.TenantHeader;
    var apiBasePath = options.Api.BasePath.TrimEnd('/');
    var apiGroup = app.MapGroup(options.Api.BasePath);
    var internalGroup = app.MapGroup(options.Api.InternalBasePath);

    internalGroup.MapPost("/rules/normalize", (JsonNode? body, NotifySchemaMigrationService service) => Normalize(body, service.UpgradeRule))
        .WithName("notify.rules.normalize")
        .Produces(StatusCodes.Status200OK)
        .Produces(StatusCodes.Status400BadRequest);

    internalGroup.MapPost("/channels/normalize", (JsonNode? body, NotifySchemaMigrationService service) => Normalize(body, service.UpgradeChannel))
        .WithName("notify.channels.normalize");

    internalGroup.MapPost("/templates/normalize", (JsonNode? body, NotifySchemaMigrationService service) => Normalize(body, service.UpgradeTemplate))
        .WithName("notify.templates.normalize");

    apiGroup.MapGet("/rules", async (IRuleRepository repository, HttpContext context, CancellationToken cancellationToken) =>
        {
            if (!TryResolveTenant(context, tenantHeader, out var tenant, out var error))
            {
                return error!;
            }

            var rules = await repository.ListAsync(tenant, cancellationToken: cancellationToken).ConfigureAwait(false);
            return JsonResponse(rules.Select(ToNotifyRule));
        })
        .RequireAuthorization(NotifyPolicies.Viewer);

    apiGroup.MapGet("/rules/{ruleId}", async (string ruleId, IRuleRepository repository, HttpContext context, CancellationToken cancellationToken) =>
        {
            if (!TryResolveTenant(context, tenantHeader, out var tenant, out var error))
            {
                return error!;
            }

            if (!TryParseGuid(ruleId, out var id))
            {
                return Results.BadRequest(new { error = "ruleId must be a GUID." });
            }

            var rule = await repository.GetByIdAsync(tenant, id, cancellationToken).ConfigureAwait(false);
            return rule is null ? Results.NotFound() : JsonResponse(ToNotifyRule(rule));
        })
        .RequireAuthorization(NotifyPolicies.Viewer);

    apiGroup.MapPost("/rules", async (JsonNode? body, NotifySchemaMigrationService service, IRuleRepository repository, HttpContext context, CancellationToken cancellationToken) =>
        {
            if (!TryResolveTenant(context, tenantHeader, out var tenant, out var error))
            {
                return error!;
            }

            if (body is null)
            {
                return Results.BadRequest(new { error = "Request body is required." });
            }

            var ruleModel = service.UpgradeRule(body);
            if (!string.Equals(ruleModel.TenantId, tenant, StringComparison.Ordinal))
            {
                return Results.BadRequest(new { error = "Tenant mismatch between header and payload." });
            }

            if (!TryParseGuid(ruleModel.RuleId, out var ruleGuid))
            {
                return Results.BadRequest(new { error = "ruleId must be a GUID." });
            }

            var entity = ToRuleEntity(ruleModel);
            var existing = await repository.GetByIdAsync(tenant, ruleGuid, cancellationToken).ConfigureAwait(false);
            if (existing is null)
            {
                await repository.CreateAsync(entity, cancellationToken).ConfigureAwait(false);
            }
            else
            {
                await repository.UpdateAsync(entity, cancellationToken).ConfigureAwait(false);
            }

            return CreatedJson(BuildResourceLocation(apiBasePath, "rules", ruleModel.RuleId), ruleModel);
        })
        .RequireAuthorization(NotifyPolicies.Operator);

    apiGroup.MapDelete("/rules/{ruleId}", async (string ruleId, IRuleRepository repository, HttpContext context, CancellationToken cancellationToken) =>
        {
            if (!TryResolveTenant(context, tenantHeader, out var tenant, out var error))
            {
                return error!;
            }

            if (!TryParseGuid(ruleId, out var ruleGuid))
            {
                return Results.BadRequest(new { error = "ruleId must be a GUID." });
            }

            await repository.DeleteAsync(tenant, ruleGuid, cancellationToken).ConfigureAwait(false);
            return Results.NoContent();
        })
        .RequireAuthorization(NotifyPolicies.Operator);

    apiGroup.MapGet("/channels", async (IChannelRepository repository, HttpContext context, CancellationToken cancellationToken) =>
        {
            if (!TryResolveTenant(context, tenantHeader, out var tenant, out var error))
            {
                return error!;
            }

            var channels = await repository.GetAllAsync(tenant, cancellationToken: cancellationToken).ConfigureAwait(false);
            return JsonResponse(channels.Select(ToNotifyChannel));
        })
        .RequireAuthorization(NotifyPolicies.Viewer);

    apiGroup.MapGet("/channels/{channelId}", async (string channelId, IChannelRepository repository, HttpContext context, CancellationToken cancellationToken) =>
        {
            if (!TryResolveTenant(context, tenantHeader, out var tenant, out var error))
            {
                return error!;
            }

            if (!TryParseGuid(channelId, out var id))
            {
                return Results.BadRequest(new { error = "channelId must be a GUID." });
            }

            var channel = await repository.GetByIdAsync(tenant, id, cancellationToken).ConfigureAwait(false);
            return channel is null ? Results.NotFound() : JsonResponse(ToNotifyChannel(channel));
        })
        .RequireAuthorization(NotifyPolicies.Viewer);

    apiGroup.MapPost("/channels", async (JsonNode? body, NotifySchemaMigrationService service, IChannelRepository repository, HttpContext context, CancellationToken cancellationToken) =>
        {
            if (!TryResolveTenant(context, tenantHeader, out var tenant, out var error))
            {
                return error!;
            }

            if (body is null)
            {
                return Results.BadRequest(new { error = "Request body is required." });
            }

            var channelModel = service.UpgradeChannel(body);
            if (!string.Equals(channelModel.TenantId, tenant, StringComparison.Ordinal))
            {
                return Results.BadRequest(new { error = "Tenant mismatch between header and payload." });
            }

            if (!TryParseGuid(channelModel.ChannelId, out var channelGuid))
            {
                return Results.BadRequest(new { error = "channelId must be a GUID." });
            }

            var entity = ToChannelEntity(channelModel);
            var existing = await repository.GetByIdAsync(tenant, channelGuid, cancellationToken).ConfigureAwait(false);
            if (existing is null)
            {
                await repository.CreateAsync(entity, cancellationToken).ConfigureAwait(false);
            }
            else
            {
                await repository.UpdateAsync(entity, cancellationToken).ConfigureAwait(false);
            }

            return CreatedJson(BuildResourceLocation(apiBasePath, "channels", channelModel.ChannelId), channelModel);
        })
        .RequireAuthorization(NotifyPolicies.Operator);

    apiGroup.MapDelete("/channels/{channelId}", async (string channelId, IChannelRepository repository, HttpContext context, CancellationToken cancellationToken) =>
        {
            if (!TryResolveTenant(context, tenantHeader, out var tenant, out var error))
            {
                return error!;
            }

            if (!TryParseGuid(channelId, out var channelGuid))
            {
                return Results.BadRequest(new { error = "channelId must be a GUID." });
            }

            await repository.DeleteAsync(tenant, channelGuid, cancellationToken).ConfigureAwait(false);
            return Results.NoContent();
        })
        .RequireAuthorization(NotifyPolicies.Operator);

    apiGroup.MapGet("/templates", async (ITemplateRepository repository, HttpContext context, CancellationToken cancellationToken) =>
        {
            if (!TryResolveTenant(context, tenantHeader, out var tenant, out var error))
            {
                return error!;
            }

            var templates = await repository.ListAsync(tenant, cancellationToken: cancellationToken).ConfigureAwait(false);
            return JsonResponse(templates.Select(ToNotifyTemplate));
        })
        .RequireAuthorization(NotifyPolicies.Viewer);

    apiGroup.MapGet("/templates/{templateId}", async (string templateId, ITemplateRepository repository, HttpContext context, CancellationToken cancellationToken) =>
        {
            if (!TryResolveTenant(context, tenantHeader, out var tenant, out var error))
            {
                return error!;
            }

            if (!TryParseGuid(templateId, out var templateGuid))
            {
                return Results.BadRequest(new { error = "templateId must be a GUID." });
            }

            var template = await repository.GetByIdAsync(tenant, templateGuid, cancellationToken).ConfigureAwait(false);
            return template is null ? Results.NotFound() : JsonResponse(ToNotifyTemplate(template));
        })
        .RequireAuthorization(NotifyPolicies.Viewer);

    apiGroup.MapPost("/templates", async (JsonNode? body, NotifySchemaMigrationService service, ITemplateRepository repository, HttpContext context, CancellationToken cancellationToken) =>
        {
            if (!TryResolveTenant(context, tenantHeader, out var tenant, out var error))
            {
                return error!;
            }

            if (body is null)
            {
                return Results.BadRequest(new { error = "Request body is required." });
            }

            var templateModel = service.UpgradeTemplate(body);
            if (!string.Equals(templateModel.TenantId, tenant, StringComparison.Ordinal))
            {
                return Results.BadRequest(new { error = "Tenant mismatch between header and payload." });
            }

            if (!TryParseGuid(templateModel.TemplateId, out var templateGuid))
            {
                return Results.BadRequest(new { error = "templateId must be a GUID." });
            }

            var entity = ToTemplateEntity(templateModel);
            var existing = await repository.GetByIdAsync(tenant, templateGuid, cancellationToken).ConfigureAwait(false);
            if (existing is null)
            {
                await repository.CreateAsync(entity, cancellationToken).ConfigureAwait(false);
            }
            else
            {
                await repository.UpdateAsync(entity, cancellationToken).ConfigureAwait(false);
            }

            return CreatedJson(BuildResourceLocation(apiBasePath, "templates", templateModel.TemplateId), templateModel);
        })
        .RequireAuthorization(NotifyPolicies.Operator);

    apiGroup.MapDelete("/templates/{templateId}", async (string templateId, ITemplateRepository repository, HttpContext context, CancellationToken cancellationToken) =>
        {
            if (!TryResolveTenant(context, tenantHeader, out var tenant, out var error))
            {
                return error!;
            }

            if (!TryParseGuid(templateId, out var templateGuid))
            {
                return Results.BadRequest(new { error = "templateId must be a GUID." });
            }

            await repository.DeleteAsync(tenant, templateGuid, cancellationToken).ConfigureAwait(false);
            return Results.NoContent();
        })
        .RequireAuthorization(NotifyPolicies.Operator);

    apiGroup.MapPost("/deliveries", async ([FromBody] JsonNode? body, IDeliveryRepository repository, HttpContext context, CancellationToken cancellationToken) =>
        {
            if (!TryResolveTenant(context, tenantHeader, out var tenant, out var error))
            {
                return error!;
            }

            if (body is null)
            {
                return Results.BadRequest(new { error = "Request body is required." });
            }

            NotifyDelivery delivery;
            try
            {
                delivery = NotifyCanonicalJsonSerializer.Deserialize<NotifyDelivery>(body.ToJsonString());
            }
            catch (Exception ex)
            {
                return Results.BadRequest(new { error = $"Invalid delivery payload: {ex.Message}" });
            }

            if (!string.Equals(delivery.TenantId, tenant, StringComparison.Ordinal))
            {
                return Results.BadRequest(new { error = "Tenant mismatch between header and payload." });
            }

            if (!TryParseGuid(delivery.DeliveryId, out var deliveryId))
            {
                return Results.BadRequest(new { error = "deliveryId must be a GUID." });
            }

            if (!TryParseGuid(delivery.ActionId, out var channelId))
            {
                return Results.BadRequest(new { error = "actionId must be a GUID representing the channel." });
            }

            if (!TryParseGuid(delivery.RuleId, out var ruleId))
            {
                return Results.BadRequest(new { error = "ruleId must be a GUID." });
            }

            var entity = ToDeliveryEntity(delivery, deliveryId, channelId, ruleId, body);
            var saved = await repository.UpsertAsync(entity, cancellationToken).ConfigureAwait(false);

            return CreatedJson(
                BuildResourceLocation(apiBasePath, "deliveries", delivery.DeliveryId),
                ToDeliveryDetail(saved, channelName: null, channelType: null));
        })
        .RequireAuthorization(NotifyPolicies.Operator);

    apiGroup.MapGet("/deliveries", async (
            IDeliveryRepository repository,
            IChannelRepository channelRepository,
            HttpContext context,
            [FromQuery] string? status,
            [FromQuery] string? channelId,
            [FromQuery] string? eventType,
            [FromQuery] DateTimeOffset? since,
            [FromQuery] DateTimeOffset? until,
            [FromQuery] int? limit,
            [FromQuery] int? offset,
            CancellationToken cancellationToken) =>
        {
            if (!TryResolveTenant(context, tenantHeader, out var tenant, out var error))
            {
                return error!;
            }

            DeliveryStatus? statusFilter = null;
            if (!string.IsNullOrWhiteSpace(status))
            {
                if (!Enum.TryParse<DeliveryStatus>(status, ignoreCase: true, out var parsed))
                {
                    return Results.BadRequest(new { error = "Unknown delivery status." });
                }

                statusFilter = parsed;
            }

            Guid? channelGuid = null;
            if (!string.IsNullOrWhiteSpace(channelId))
            {
                if (!Guid.TryParse(channelId, out var parsedChannel))
                {
                    return Results.BadRequest(new { error = "channelId must be a GUID." });
                }

                channelGuid = parsedChannel;
            }

            var take = Math.Clamp(limit ?? 100, 1, 500);
            var skip = Math.Max(0, offset ?? 0);

            var deliveries = await repository
                .QueryAsync(tenant, statusFilter, channelGuid, eventType, since, until, take, skip, cancellationToken)
                .ConfigureAwait(false);

            var summaries = new List<object>(deliveries.Count);
            foreach (var delivery in deliveries)
            {
                string? channelName = null;
                string? channelType = null;

                var channel = await channelRepository.GetByIdAsync(delivery.TenantId, delivery.ChannelId, cancellationToken).ConfigureAwait(false);
                if (channel is not null)
                {
                    channelName = channel.Name;
                    channelType = channel.ChannelType.ToString().ToLowerInvariant();
                }

                summaries.Add(ToDeliverySummary(delivery, channelName, channelType));
            }

            var hasMore = deliveries.Count == take;
            var nextCursor = hasMore ? (skip + deliveries.Count).ToString(CultureInfo.InvariantCulture) : null;

            return JsonResponse(new
            {
                items = summaries,
                count = summaries.Count,
                total = summaries.Count,
                hasMore,
                nextCursor,
                continuationToken = nextCursor
            });
        })
        .RequireAuthorization(NotifyPolicies.Viewer)
        .RequireRateLimiting(NotifyRateLimitPolicies.DeliveryHistory);

    apiGroup.MapGet("/deliveries/{deliveryId}", async (
            string deliveryId,
            IDeliveryRepository repository,
            IChannelRepository channelRepository,
            HttpContext context,
            [FromQuery] string? tenant,
            CancellationToken cancellationToken) =>
        {
            var headerResolved = TryResolveTenant(context, tenantHeader, out var tenantFromHeader, out var error);
            var effectiveTenant = tenant ?? tenantFromHeader;

            if (effectiveTenant is null && !headerResolved)
            {
                return error!;
            }

            if (effectiveTenant is null)
            {
                return Results.BadRequest(new { error = "Tenant must be provided via header or query string." });
            }

            if (!TryParseGuid(deliveryId, out var deliveryGuid))
            {
                return Results.BadRequest(new { error = "deliveryId must be a GUID." });
            }

            var delivery = await repository.GetByIdAsync(effectiveTenant, deliveryGuid, cancellationToken).ConfigureAwait(false);
            if (delivery is null)
            {
                return Results.NotFound();
            }

            string? channelName = null;
            string? channelType = null;
            var channel = await channelRepository.GetByIdAsync(effectiveTenant, delivery.ChannelId, cancellationToken).ConfigureAwait(false);
            if (channel is not null)
            {
                channelName = channel.Name;
                channelType = channel.ChannelType.ToString().ToLowerInvariant();
            }

            return JsonResponse(ToDeliveryDetail(delivery, channelName, channelType));
        })
        .RequireAuthorization(NotifyPolicies.Viewer)
        .RequireRateLimiting(NotifyRateLimitPolicies.DeliveryHistory);

    apiGroup.MapPost("/digests", async ([FromBody] DigestUpsertRequest? request, IDigestRepository repository, HttpContext context, CancellationToken cancellationToken) =>
        {
            if (!TryResolveTenant(context, tenantHeader, out var tenant, out var error))
            {
                return error!;
            }

            if (request is null)
            {
                return Results.BadRequest(new { error = "Request body is required." });
            }

            if (!TryParseGuid(request.ChannelId, out var channelIdGuid))
            {
                return Results.BadRequest(new { error = "channelId must be a GUID." });
            }

            if (string.IsNullOrWhiteSpace(request.Recipient))
            {
                return Results.BadRequest(new { error = "recipient is required." });
            }

            if (string.IsNullOrWhiteSpace(request.DigestKey))
            {
                return Results.BadRequest(new { error = "digestKey is required." });
            }

            var collectUntil = request.CollectUntil ?? DateTimeOffset.UtcNow.AddHours(1);
            var eventsJson = request.Events?.ToJsonString() ?? "[]";
            var digest = new DigestEntity
            {
                Id = Guid.NewGuid(),
                TenantId = tenant,
                ChannelId = channelIdGuid,
                Recipient = request.Recipient,
                DigestKey = request.DigestKey,
                EventCount = request.Events?.Count ?? 0,
                Events = eventsJson,
                Status = DigestStatus.Collecting,
                CollectUntil = collectUntil,
                SentAt = null,
                CreatedAt = DateTimeOffset.UtcNow,
                UpdatedAt = DateTimeOffset.UtcNow
            };

            var saved = await repository.UpsertAsync(digest, cancellationToken).ConfigureAwait(false);

            return CreatedJson(
                BuildResourceLocation(apiBasePath, "digests", request.DigestKey),
                ToDigestResponse(saved));
        })
        .RequireAuthorization(NotifyPolicies.Operator);

    apiGroup.MapGet("/digests/{actionKey}", async (
            string actionKey,
            [FromQuery] string channelId,
            [FromQuery] string recipient,
            IDigestRepository repository,
            HttpContext context,
            CancellationToken cancellationToken) =>
        {
            if (!TryResolveTenant(context, tenantHeader, out var tenant, out var error))
            {
                return error!;
            }

            if (!TryParseGuid(channelId, out var channelGuid))
            {
                return Results.BadRequest(new { error = "channelId must be a GUID." });
            }

            if (string.IsNullOrWhiteSpace(recipient))
            {
                return Results.BadRequest(new { error = "recipient is required." });
            }

            var digest = await repository.GetByKeyAsync(tenant, channelGuid, recipient, actionKey, cancellationToken).ConfigureAwait(false);
            return digest is null ? Results.NotFound() : JsonResponse(ToDigestResponse(digest));
        })
        .RequireAuthorization(NotifyPolicies.Viewer);

    apiGroup.MapDelete("/digests/{actionKey}", async (
            string actionKey,
            [FromQuery] string channelId,
            [FromQuery] string recipient,
            IDigestRepository repository,
            HttpContext context,
            CancellationToken cancellationToken) =>
        {
            if (!TryResolveTenant(context, tenantHeader, out var tenant, out var error))
            {
                return error!;
            }

            if (!TryParseGuid(channelId, out var channelGuid))
            {
                return Results.BadRequest(new { error = "channelId must be a GUID." });
            }

            if (string.IsNullOrWhiteSpace(recipient))
            {
                return Results.BadRequest(new { error = "recipient is required." });
            }

            var deleted = await repository.DeleteByKeyAsync(tenant, channelGuid, recipient, actionKey, cancellationToken).ConfigureAwait(false);
            return deleted ? Results.NoContent() : Results.NotFound();
        })
        .RequireAuthorization(NotifyPolicies.Operator);

    apiGroup.MapPost("/audit", async ([FromBody] JsonNode? body, INotifyAuditRepository repository, HttpContext context, ClaimsPrincipal user, CancellationToken cancellationToken) =>
        {
            if (!TryResolveTenant(context, tenantHeader, out var tenant, out var error))
            {
                return error!;
            }

            if (body is null)
            {
                return Results.BadRequest(new { error = "Request body is required." });
            }

            var action = body["action"]?.GetValue<string>();
            if (string.IsNullOrWhiteSpace(action))
            {
                return Results.BadRequest(new { error = "Action is required." });
            }

            var entry = new NotifyAuditEntity
            {
                TenantId = tenant,
                UserId = Guid.TryParse(user.FindFirstValue(ClaimTypes.NameIdentifier), out var userId) ? userId : null,
                Action = action,
                ResourceType = body["entityType"]?.GetValue<string>() ?? string.Empty,
                ResourceId = body["entityId"]?.GetValue<string>(),
                Details = body["payload"]?.ToJsonString(),
                CorrelationId = context.TraceIdentifier,
                CreatedAt = DateTimeOffset.UtcNow
            };

            var id = await repository.CreateAsync(entry, cancellationToken).ConfigureAwait(false);
            return CreatedJson(BuildResourceLocation(apiBasePath, "audit", id.ToString()), new { id });
        })
        .RequireAuthorization(NotifyPolicies.Operator);

    apiGroup.MapGet("/audit", async (INotifyAuditRepository repository, HttpContext context, [FromQuery] int? limit, [FromQuery] int? offset, CancellationToken cancellationToken) =>
        {
            if (!TryResolveTenant(context, tenantHeader, out var tenant, out var error))
            {
                return error!;
            }

            var results = await repository.ListAsync(tenant, limit ?? 100, offset ?? 0, cancellationToken).ConfigureAwait(false);
            var payload = results.Select(a => new
            {
                a.Id,
                a.TenantId,
                a.UserId,
                a.Action,
                a.ResourceType,
                a.ResourceId,
                a.CorrelationId,
                a.CreatedAt,
                Details = string.IsNullOrWhiteSpace(a.Details) ? null : JsonNode.Parse(a.Details)
            });

            return JsonResponse(payload);
        })
        .RequireAuthorization(NotifyPolicies.Viewer);

    apiGroup.MapPost("/locks/acquire", async ([FromBody] AcquireLockRequest request, ILockRepository repository, HttpContext context, CancellationToken cancellationToken) =>
        {
            if (!TryResolveTenant(context, tenantHeader, out var tenant, out var error))
            {
                return error!;
            }

            var acquired = await repository.TryAcquireAsync(tenant, request.Resource, request.Owner, TimeSpan.FromSeconds(request.TtlSeconds), cancellationToken).ConfigureAwait(false);
            return JsonResponse(new { acquired });
        })
        .RequireAuthorization(NotifyPolicies.Operator);

    apiGroup.MapPost("/locks/release", async ([FromBody] ReleaseLockRequest request, ILockRepository repository, HttpContext context, CancellationToken cancellationToken) =>
        {
            if (!TryResolveTenant(context, tenantHeader, out var tenant, out var error))
            {
                return error!;
            }

            var released = await repository.ReleaseAsync(tenant, request.Resource, request.Owner, cancellationToken).ConfigureAwait(false);
            return released ? Results.NoContent() : Results.NotFound();
        })
        .RequireAuthorization(NotifyPolicies.Operator);
}

static bool TryParseGuid(string value, out Guid guid) => Guid.TryParse(value, out guid);

static RuleEntity ToRuleEntity(NotifyRule rule)
{
    var channelIds = rule.Actions.Select(action => ParseRequiredGuid(action.Channel, "channel"))
        .ToArray();
    var templateId = rule.Actions
        .Select(action => action.Template)
        .Where(id => id is not null)
        .Select(id => Guid.TryParse(id, out var parsed) ? parsed : (Guid?)null)
        .FirstOrDefault();

    return new RuleEntity
    {
        Id = ParseRequiredGuid(rule.RuleId, "ruleId"),
        TenantId = rule.TenantId,
        Name = rule.Name,
        Description = rule.Description ?? string.Empty,
        Enabled = rule.Enabled,
        Priority = 0,
        EventTypes = rule.Match.EventKinds.ToArray(),
        Filter = NotifyCanonicalJsonSerializer.Serialize(rule.Match),
        ChannelIds = channelIds,
        TemplateId = templateId,
        Metadata = NotifyCanonicalJsonSerializer.Serialize(rule),
        CreatedAt = rule.CreatedAt,
        UpdatedAt = rule.UpdatedAt
    };
}

static NotifyRule ToNotifyRule(RuleEntity entity)
{
    var match = string.IsNullOrWhiteSpace(entity.Filter)
        ? NotifyRuleMatch.Create()
        : NotifyCanonicalJsonSerializer.Deserialize<NotifyRuleMatch>(entity.Filter);

    var actions = entity.ChannelIds.Select((channelId, index) =>
        NotifyRuleAction.Create(
            actionId: $"action-{index + 1}",
            channel: channelId.ToString(),
            template: entity.TemplateId?.ToString()))
        .ToImmutableArray();

    var metadata = DeserializeMetadata(entity.Metadata);

    return NotifyRule.Create(
        entity.Id.ToString(),
        entity.TenantId,
        entity.Name,
        match,
        actions,
        enabled: entity.Enabled,
        description: entity.Description,
        metadata: metadata,
        createdAt: entity.CreatedAt,
        updatedAt: entity.UpdatedAt);
}

static ChannelEntity ToChannelEntity(NotifyChannel channel)
{
    return new ChannelEntity
    {
        Id = ParseRequiredGuid(channel.ChannelId, "channelId"),
        TenantId = channel.TenantId,
        Name = channel.Name,
        ChannelType = ToStorageChannelType(channel.Type),
        Enabled = channel.Enabled,
        Config = NotifyCanonicalJsonSerializer.Serialize(channel.Config),
        Metadata = NotifyCanonicalJsonSerializer.Serialize(channel),
        CreatedAt = channel.CreatedAt,
        UpdatedAt = channel.UpdatedAt,
        CreatedBy = channel.CreatedBy
    };
}

static NotifyChannel ToNotifyChannel(ChannelEntity entity)
{
    var config = string.IsNullOrWhiteSpace(entity.Config)
        ? NotifyChannelConfig.Create("inline-default")
        : NotifyCanonicalJsonSerializer.Deserialize<NotifyChannelConfig>(entity.Config);

    var metadataModel = TryDeserialize<NotifyChannel>(entity.Metadata);

    return metadataModel ??
        NotifyChannel.Create(
            entity.Id.ToString(),
            entity.TenantId,
            entity.Name,
            ToModelChannelType(entity.ChannelType),
            config,
            enabled: entity.Enabled,
            createdBy: entity.CreatedBy,
            createdAt: entity.CreatedAt,
            updatedAt: entity.UpdatedAt);
}

static TemplateEntity ToTemplateEntity(NotifyTemplate template)
{
    return new TemplateEntity
    {
        Id = ParseRequiredGuid(template.TemplateId, "templateId"),
        TenantId = template.TenantId,
        Name = template.Key,
        ChannelType = ToStorageChannelType(template.ChannelType),
        BodyTemplate = template.Body,
        Locale = template.Locale,
        Metadata = NotifyCanonicalJsonSerializer.Serialize(template),
        CreatedAt = template.CreatedAt,
        UpdatedAt = template.UpdatedAt,
        SubjectTemplate = template.Description
    };
}

static NotifyTemplate ToNotifyTemplate(TemplateEntity entity)
{
    var metadataModel = TryDeserialize<NotifyTemplate>(entity.Metadata);
    if (metadataModel is not null)
    {
        return metadataModel;
    }

    return NotifyTemplate.Create(
        entity.Id.ToString(),
        entity.TenantId,
        ToModelChannelType(entity.ChannelType),
        entity.Name,
        entity.Locale,
        entity.BodyTemplate,
        description: entity.SubjectTemplate,
        metadata: DeserializeMetadata(entity.Metadata),
        createdAt: entity.CreatedAt,
        updatedAt: entity.UpdatedAt);
}

static ChannelType ToStorageChannelType(NotifyChannelType type) => type switch
{
    NotifyChannelType.Email => ChannelType.Email,
    NotifyChannelType.Slack => ChannelType.Slack,
    NotifyChannelType.Teams => ChannelType.Teams,
    NotifyChannelType.Webhook => ChannelType.Webhook,
    NotifyChannelType.PagerDuty => ChannelType.PagerDuty,
    NotifyChannelType.OpsGenie => ChannelType.OpsGenie,
    _ => ChannelType.Webhook
};

static NotifyChannelType ToModelChannelType(ChannelType type) => type switch
{
    ChannelType.Email => NotifyChannelType.Email,
    ChannelType.Slack => NotifyChannelType.Slack,
    ChannelType.Teams => NotifyChannelType.Teams,
    ChannelType.Webhook => NotifyChannelType.Webhook,
    ChannelType.PagerDuty => NotifyChannelType.PagerDuty,
    ChannelType.OpsGenie => NotifyChannelType.OpsGenie,
    _ => NotifyChannelType.Webhook
};

static Guid ParseRequiredGuid(string value, string field)
{
    if (Guid.TryParse(value, out var guid))
    {
        return guid;
    }

    throw new InvalidOperationException($"{field} must be a GUID.");
}

static ImmutableDictionary<string, string>? DeserializeMetadata(string? json)
{
    if (string.IsNullOrWhiteSpace(json))
    {
        return null;
    }

    try
    {
        var dictionary = JsonSerializer.Deserialize<Dictionary<string, string>>(json) ?? new Dictionary<string, string>();
        return dictionary.ToImmutableDictionary(StringComparer.Ordinal);
    }
    catch
    {
        return null;
    }
}

static DeliveryEntity ToDeliveryEntity(NotifyDelivery delivery, Guid deliveryId, Guid channelId, Guid ruleId, JsonNode rawPayload)
{
    var correlationId = delivery.Metadata.TryGetValue("traceId", out var trace) ? trace : null;
    var recipient = delivery.Rendered?.Target;
    if (string.IsNullOrWhiteSpace(recipient) && delivery.Metadata.TryGetValue("target", out var target))
    {
        recipient = target;
    }

    if (string.IsNullOrWhiteSpace(recipient))
    {
        recipient = "unknown";
    }

    return new DeliveryEntity
    {
        Id = deliveryId,
        TenantId = delivery.TenantId,
        ChannelId = channelId,
        RuleId = ruleId,
        TemplateId = null,
        Status = ToStorageDeliveryStatus(delivery.Status),
        Recipient = recipient,
        Subject = delivery.Rendered?.Title,
        Body = delivery.Rendered?.Body,
        EventType = delivery.Kind,
        EventPayload = rawPayload.ToJsonString(),
        Attempt = delivery.Attempts.Length,
        MaxAttempts = 3,
        NextRetryAt = null,
        ErrorMessage = delivery.StatusReason,
        ExternalId = null,
        CorrelationId = correlationId,
        CreatedAt = delivery.CreatedAt,
        QueuedAt = null,
        SentAt = delivery.SentAt,
        DeliveredAt = delivery.CompletedAt,
        FailedAt = delivery.Status == NotifyDeliveryStatus.Failed ? delivery.CompletedAt : null
    };
}

static object ToDeliverySummary(DeliveryEntity entity, string? channelName, string? channelType)
    => new
    {
        deliveryId = entity.Id.ToString(),
        channelId = entity.ChannelId.ToString(),
        channelName,
        channelType,
        eventType = entity.EventType,
        status = DeliveryStatusToString(entity.Status),
        attemptCount = entity.Attempt,
        createdAt = entity.CreatedAt,
        sentAt = entity.SentAt,
        latencyMs = entity.SentAt is { } sent ? (long?)(sent - entity.CreatedAt).TotalMilliseconds : null
    };

static object ToDeliveryDetail(DeliveryEntity entity, string? channelName, string? channelType)
    => new
    {
        deliveryId = entity.Id.ToString(),
        tenantId = entity.TenantId,
        channelId = entity.ChannelId.ToString(),
        channelName,
        channelType,
        ruleId = entity.RuleId?.ToString(),
        eventType = entity.EventType,
        status = DeliveryStatusToString(entity.Status),
        subject = entity.Subject,
        attemptCount = entity.Attempt,
        attempts = Array.Empty<object>(),
        createdAt = entity.CreatedAt,
        sentAt = entity.SentAt,
        failedAt = entity.FailedAt,
        errorMessage = entity.ErrorMessage,
        idempotencyKey = entity.CorrelationId
    };

static string DeliveryStatusToString(DeliveryStatus status) => status.ToString().ToLowerInvariant();

static DeliveryStatus ToStorageDeliveryStatus(NotifyDeliveryStatus status) => status switch
{
    NotifyDeliveryStatus.Pending => DeliveryStatus.Pending,
    NotifyDeliveryStatus.Sent => DeliveryStatus.Sent,
    NotifyDeliveryStatus.Failed => DeliveryStatus.Failed,
    NotifyDeliveryStatus.Throttled => DeliveryStatus.Queued,
    NotifyDeliveryStatus.Digested => DeliveryStatus.Delivered,
    NotifyDeliveryStatus.Dropped => DeliveryStatus.Failed,
    _ => DeliveryStatus.Pending
};

static object ToDigestResponse(DigestEntity entity) => new
{
    id = entity.Id,
    tenantId = entity.TenantId,
    channelId = entity.ChannelId,
    recipient = entity.Recipient,
    digestKey = entity.DigestKey,
    eventCount = entity.EventCount,
    events = string.IsNullOrWhiteSpace(entity.Events) ? new JsonArray() : JsonNode.Parse(entity.Events),
    status = entity.Status,
    collectUntil = entity.CollectUntil,
    sentAt = entity.SentAt,
    createdAt = entity.CreatedAt,
    updatedAt = entity.UpdatedAt
};

static T? TryDeserialize<T>(string? json)
{
    if (string.IsNullOrWhiteSpace(json))
    {
        return default;
    }

    try
    {
        return NotifyCanonicalJsonSerializer.Deserialize<T>(json);
    }
    catch
    {
        return default;
    }
}

static bool TryResolveTenant(HttpContext context, string tenantHeader, out string tenant, out IResult? error)
{
    if (!context.Request.Headers.TryGetValue(tenantHeader, out var header) || string.IsNullOrWhiteSpace(header))
    {
        tenant = string.Empty;
        error = Results.BadRequest(new { error = $"{tenantHeader} header is required." });
        return false;
    }

    tenant = header.ToString().Trim();
    error = null;
    return true;
}

static string BuildResourceLocation(string basePath, params string[] segments)
{
    if (segments.Length == 0)
    {
        return basePath;
    }

    var builder = new StringBuilder(basePath);
    foreach (var segment in segments)
    {
        builder.Append('/');
        builder.Append(Uri.EscapeDataString(segment));
    }

    return builder.ToString();
}

static IResult JsonResponse<T>(T value, int statusCode = StatusCodes.Status200OK, string? location = null)
{
    var payload = JsonSerializer.Serialize(value, new JsonSerializerOptions(JsonSerializerDefaults.Web));
    return new JsonHttpResult(payload, statusCode, location);
}

static IResult CreatedJson<T>(string location, T value)
    => JsonResponse(value, StatusCodes.Status201Created, location);

static IResult Normalize<TModel>(JsonNode? body, Func<JsonNode, TModel> upgrade)
{
    if (body is null)
    {
        return Results.BadRequest(new { error = "Request body is required." });
    }

    try
    {
        var model = upgrade(body);
        var json = NotifyCanonicalJsonSerializer.Serialize(model);
        return Results.Content(json, "application/json");
    }
    catch (Exception ex)
    {
        return Results.BadRequest(new { error = ex.Message });
    }
}

static bool HasScope(ClaimsPrincipal principal, string scope)
{
    if (principal is null || string.IsNullOrWhiteSpace(scope))
    {
        return false;
    }

    foreach (var claim in principal.Claims)
    {
        if (!string.Equals(claim.Type, "scope", StringComparison.OrdinalIgnoreCase)
            && !string.Equals(claim.Type, "http://schemas.microsoft.com/identity/claims/scope", StringComparison.OrdinalIgnoreCase))
        {
            continue;
        }

        if (string.IsNullOrWhiteSpace(claim.Value))
        {
            continue;
        }

        var values = claim.Value.Split(new[] { ' ', '\t', '\r', '\n' }, StringSplitOptions.RemoveEmptyEntries);
        foreach (var value in values)
        {
            if (string.Equals(value, scope, StringComparison.OrdinalIgnoreCase))
            {
                return true;
            }
        }
    }

    return false;
}

static LogEventLevel MapLogLevel(string configuredLevel)
{
    return configuredLevel?.ToLowerInvariant() switch
    {
        "verbose" => LogEventLevel.Verbose,
        "debug" => LogEventLevel.Debug,
        "warning" => LogEventLevel.Warning,
        "error" => LogEventLevel.Error,
        "fatal" => LogEventLevel.Fatal,
        _ => LogEventLevel.Information
    };
}