using Acl.Application;
using Acl.Infrastructure;
using OpenTelemetry.Metrics;
using OpenTelemetry.Resources;
using OpenTelemetry.Trace;

var builder = WebApplication.CreateBuilder(args);

// OpenTelemetry tracing (S-16b, ADR-0023): auto-instrument incoming ASP.NET Core requests and
// outgoing HttpClient calls (the ACL → OpenZaak hop), exported over OTLP to Tempo. Service name +
// OTLP endpoint come from OTEL_* env (compose); the exporter no-ops when Tempo is unreachable.
builder.Services.AddOpenTelemetry()
    .ConfigureResource(r => r.AddService(
        builder.Configuration["OTEL_SERVICE_NAME"] ?? builder.Environment.ApplicationName))
    .WithTracing(tracing => tracing
        .AddAspNetCoreInstrumentation(o => o.Filter = ctx => ctx.Request.Path != "/health")
        .AddHttpClientInstrumentation()
        .AddOtlpExporter())
    // OpenTelemetry metrics (S-16c, ADR-0023): golden signals for the request path —
    // http.server.request.duration (traffic/errors/latency) + http.client.* for downstream hops, plus
    // the built-in System.Runtime meter for saturation (GC, CPU, thread pool). Prometheus scrapes these
    // from /metrics (mapped below); metrics aren't pushed over OTLP, so no collector hop (ADR-0023).
    .WithMetrics(metrics => metrics
        .AddAspNetCoreInstrumentation()
        .AddHttpClientInstrumentation()
        .AddMeter("System.Runtime")
        .AddPrometheusExporter());

builder.Services.AddSingleton<IClock, SystemClock>();
builder.Services.AddSingleton(sp => sp.GetRequiredService<IConfiguration>()
    .GetSection("Acl:Defaults").Get<AclDefaults>()
    ?? throw new InvalidOperationException("Missing configuration section 'Acl:Defaults'"));
builder.Services.AddSingleton(sp => sp.GetRequiredService<IConfiguration>()
    .GetSection("Acl:OpenZaak").Get<OpenZaakOptions>()
    ?? throw new InvalidOperationException("Missing configuration section 'Acl:OpenZaak'"));
builder.Services.AddHttpClient<IZaakGateway, OpenZaakGateway>();
// Singleton so the resolved zaaktype/informatieobjecttype URLs are cached across requests (S-27).
builder.Services.AddSingleton<IZaaktypeCatalog, CachedZaaktypeCatalog>();
builder.Services.AddScoped<AclService>();

var app = builder.Build();

app.MapGet("/health", () => "Healthy");

// Prometheus scrape endpoint (S-16c): exposes the OTel metrics above in Prometheus text format.
app.MapPrometheusScrapingEndpoint();

// The ACL's single operation, exposed as a service endpoint.
app.MapPost("/zaken", async (OpenZaakRequest body, AclService acl, CancellationToken ct) =>
{
    var zaakUrl = await acl.OpenZaakAsync(new DomainRegistration(body.Bsn, body.Reference), ct);
    return Results.Ok(new { zaakUrl = zaakUrl.ToString() });
});

// Approve a zaak: set it to its zaaktype's eindstatus (S-09b). The domain hands over only the zaak
// URL; the ACL owns the ZGW statustype resolution (§8.1).
app.MapPost("/statussen", async (SetStatusRequest body, AclService acl, CancellationToken ct) =>
{
    await acl.ApproveZaakAsync(new Uri(body.ZaakUrl), ct);
    return Results.NoContent();
});

// Cancel a zaak on document-timeout expiry (S-10c): set it to its zaaktype's cancellation statustype
// + resultaat. The domain hands over only the zaak URL; the ACL owns the ZGW resolution (§8.1).
app.MapPost("/annuleringen", async (CancelZaakRequest body, AclService acl, CancellationToken ct) =>
{
    await acl.CancelZaakAsync(new Uri(body.ZaakUrl), ct);
    return Results.NoContent();
});

// Read a zaak's public-safe reference (its identificatie). The Event Subscriber calls this to enrich
// the read projection without reading ZGW itself (§8.1, #78).
app.MapPost("/zaken/reference", async (ZaakReferenceRequest body, AclService acl, CancellationToken ct) =>
{
    var reference = await acl.GetZaakReferenceAsync(new Uri(body.ZaakUrl), ct);
    return Results.Ok(new { reference });
});

// Store an uploaded diploma against a zaak (S-10b): the domain sends the file as base64; the ACL
// creates the ZGW enkelvoudiginformatieobject and relates it to the zaak (§8.1). Returns its URL.
app.MapPost("/documenten", async (StoreDocumentRequest body, AclService acl, CancellationToken ct) =>
{
    var url = await acl.StoreDiplomaAsync(
        new Uri(body.ZaakUrl), Convert.FromBase64String(body.ContentBase64), body.FileName, body.ContentType, ct);
    return Results.Ok(new { informatieobjectUrl = url.ToString() });
});

// List the published zaaktypen — the read-only catalogus the beheer portal shows (S-15a). The BFF
// proxies this behind medewerker-realm + beheerder authorization; the ACL trusts its callers (§8.3)
// and is the only code allowed to read the ZGW Catalogi API (§8.1).
app.MapGet("/catalogi/zaaktypen", async (AclService acl, CancellationToken ct) =>
    Results.Ok(await acl.ListZaaktypenAsync(ct)));

app.Run();

public sealed record OpenZaakRequest(string Bsn, string Reference);

public sealed record SetStatusRequest(string ZaakUrl);

public sealed record CancelZaakRequest(string ZaakUrl);

public sealed record ZaakReferenceRequest(string ZaakUrl);

public sealed record StoreDocumentRequest(string ZaakUrl, string ContentBase64, string FileName, string ContentType);

public partial class Program;