using NATS.Server;
using NATS.Server.Auth;
using NATS.Server.Imports;

namespace NATS.Server.Tests;

public class ImportExportTests
{
    [Fact]
    public void ExportAuth_public_export_authorizes_any_account()
    {
        var auth = new ExportAuth();
        var account = new Account("test");
        auth.IsAuthorized(account).ShouldBeTrue();
    }

    [Fact]
    public void ExportAuth_approved_accounts_restricts_access()
    {
        var auth = new ExportAuth { ApprovedAccounts = ["allowed"] };
        var allowed = new Account("allowed");
        var denied = new Account("denied");
        auth.IsAuthorized(allowed).ShouldBeTrue();
        auth.IsAuthorized(denied).ShouldBeFalse();
    }

    [Fact]
    public void ExportAuth_revoked_account_denied()
    {
        var auth = new ExportAuth
        {
            ApprovedAccounts = ["test"],
            RevokedAccounts = new() { ["test"] = DateTimeOffset.UtcNow.ToUnixTimeSeconds() },
        };
        var account = new Account("test");
        auth.IsAuthorized(account).ShouldBeFalse();
    }

    [Fact]
    public void ServiceResponseType_defaults_to_singleton()
    {
        var import = new ServiceImport
        {
            DestinationAccount = new Account("dest"),
            From = "requests.>",
            To = "api.>",
        };
        import.ResponseType.ShouldBe(ServiceResponseType.Singleton);
    }

    [Fact]
    public void ExportMap_stores_and_retrieves_exports()
    {
        var map = new ExportMap();
        map.Services["api.>"] = new ServiceExport { Account = new Account("svc") };
        map.Streams["events.>"] = new StreamExport();

        map.Services.ShouldContainKey("api.>");
        map.Streams.ShouldContainKey("events.>");
    }

    [Fact]
    public void ImportMap_stores_service_imports()
    {
        var map = new ImportMap();
        var si = new ServiceImport
        {
            DestinationAccount = new Account("dest"),
            From = "requests.>",
            To = "api.>",
        };
        map.AddServiceImport(si);
        map.Services.ShouldContainKey("requests.>");
        map.Services["requests.>"].Count.ShouldBe(1);
    }

    [Fact]
    public void Account_add_service_export_and_import()
    {
        var exporter = new Account("exporter");
        var importer = new Account("importer");

        exporter.AddServiceExport("api.>", ServiceResponseType.Singleton, null);
        exporter.Exports.Services.ShouldContainKey("api.>");

        var si = importer.AddServiceImport(exporter, "requests.>", "api.>");
        si.ShouldNotBeNull();
        si.From.ShouldBe("requests.>");
        si.To.ShouldBe("api.>");
        si.DestinationAccount.ShouldBe(exporter);
        importer.Imports.Services.ShouldContainKey("requests.>");
    }

    [Fact]
    public void Account_add_stream_export_and_import()
    {
        var exporter = new Account("exporter");
        var importer = new Account("importer");

        exporter.AddStreamExport("events.>", null);
        exporter.Exports.Streams.ShouldContainKey("events.>");

        importer.AddStreamImport(exporter, "events.>", "imported.events.>");
        importer.Imports.Streams.Count.ShouldBe(1);
        importer.Imports.Streams[0].From.ShouldBe("events.>");
        importer.Imports.Streams[0].To.ShouldBe("imported.events.>");
    }

    [Fact]
    public void Account_service_import_auth_rejected()
    {
        var exporter = new Account("exporter");
        var importer = new Account("importer");

        exporter.AddServiceExport("api.>", ServiceResponseType.Singleton, [new Account("other")]);

        Should.Throw<UnauthorizedAccessException>(() =>
            importer.AddServiceImport(exporter, "requests.>", "api.>"));
    }

    [Fact]
    public void Account_lazy_creates_internal_client()
    {
        var account = new Account("test");
        var client = account.GetOrCreateInternalClient(99);
        client.ShouldNotBeNull();
        client.Kind.ShouldBe(ClientKind.Account);
        client.Account.ShouldBe(account);

        // Second call returns same instance
        var client2 = account.GetOrCreateInternalClient(100);
        client2.ShouldBeSameAs(client);
    }
}