// Copyright 2017-2026 The NATS Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// Ported from:
//   server/accounts_test.go  (5 tests — route account mappings)
//   server/auth_callout_test.go (5 tests — external auth callout)
//   server/jwt_test.go (11 tests — JWT validation)

using System.Net;
using NATS.Client.Core;
using Shouldly;
using Xunit.Abstractions;
using ZB.MOM.NatsNet.Server;
using ZB.MOM.NatsNet.Server.Auth;
using ZB.MOM.NatsNet.Server.IntegrationTests.Helpers;

namespace ZB.MOM.NatsNet.Server.IntegrationTests.Auth;

/// <summary>
/// Integration tests for authentication and account features.
/// Mirrors Go tests from accounts_test.go, auth_callout_test.go, and jwt_test.go.
/// </summary>
[Collection("AuthIntegrationTests")]
[Trait("Category", "Integration")]
public class AuthIntegrationTests : IntegrationTestBase
{
    public AuthIntegrationTests(ITestOutputHelper output) : base(output) { }

    // =========================================================================
    // accounts_test.go — Account Isolation
    // =========================================================================

    /// <summary>
    /// Verifies that messages published in one account are not delivered to another.
    /// Mirrors Go <c>TestAccountIsolation</c>.
    /// </summary>
    [Fact(Skip = "deferred: requires running NATS server")]
    public void AccountIsolation_ShouldNotCrossAccounts()
    { }

    /// <summary>
    /// Verifies that stream import/export enables cross-account delivery.
    /// Mirrors Go <c>TestAccountIsolationExportImport</c>.
    /// </summary>
    [Fact(Skip = "deferred: requires running NATS server")]
    public void AccountIsolationExportImport_ShouldDeliverViaImport()
    { }

    /// <summary>
    /// Verifies that multi-account server allows independent connections per account.
    /// Mirrors Go <c>TestMultiAccountsIsolation</c>.
    /// </summary>
    [Fact(Skip = "deferred: requires running NATS server")]
    public void MultiAccountsIsolation_ShouldAllowIndependentSubscriptions()
    { }

    /// <summary>
    /// Verifies that accounts configured from options map users correctly.
    /// Mirrors Go <c>TestAccountFromOptions</c>.
    /// </summary>
    [Fact(Skip = "deferred: requires running NATS server")]
    public void AccountFromOptions_ShouldMapUsersCorrectly()
    { }

    /// <summary>
    /// Verifies basic pub/sub within a single account on a multi-account server.
    /// Mirrors Go <c>TestSimpleMapping</c> (pub/sub behavior).
    /// </summary>
    [Fact(Skip = "deferred: requires running NATS server")]
    public void SimpleAccountPubSub_ShouldDeliverWithinAccount()
    { }

    // =========================================================================
    // auth_callout_test.go — Auth Callout
    // =========================================================================

    /// <summary>
    /// Verifies basic server startup with auth callout configured.
    /// Mirrors Go <c>TestAuthCalloutBasics</c> (server boot + connection behavior).
    /// </summary>
    [Fact(Skip = "deferred: requires running NATS server")]
    public void AuthCalloutBasics_ServerBoots_ShouldSucceed()
    { }

    /// <summary>
    /// Verifies that multi-account setup works with designated auth user.
    /// Mirrors Go <c>TestAuthCalloutMultiAccounts</c> (multi-account behavior).
    /// </summary>
    [Fact(Skip = "deferred: requires running NATS server")]
    public void AuthCalloutMultiAccounts_ShouldSupportMultipleAccounts()
    { }

    /// <summary>
    /// Verifies that allowed accounts configuration restricts callout routing.
    /// Mirrors Go <c>TestAuthCalloutAllowedAccounts</c>.
    /// </summary>
    [Fact(Skip = "deferred: requires running NATS server")]
    public void AuthCalloutAllowedAccounts_ShouldEnforceAccountBoundaries()
    { }

    /// <summary>
    /// Verifies that operator mode restriction prevents inline auth callout config.
    /// Mirrors Go <c>TestAuthCalloutOperatorNoServerConfigCalloutAllowed</c>.
    /// </summary>
    [Fact(Skip = "deferred: requires running NATS server")]
    public void AuthCalloutOperatorNoServerConfigCalloutAllowed_ShouldErrorOnBoot()
    { }

    /// <summary>
    /// Verifies server correctly handles connection error on bad callout credentials.
    /// Mirrors Go <c>TestAuthCalloutErrorResponse</c>.
    /// </summary>
    [Fact(Skip = "deferred: requires running NATS server")]
    public void AuthCalloutErrorResponse_ShouldRejectBadCredentials()
    { }

    // =========================================================================
    // jwt_test.go — JWT Validation
    // =========================================================================

    /// <summary>
    /// Verifies server requires auth when configured with trusted keys.
    /// Mirrors Go <c>TestJWTUser</c> — auth-required behavior.
    /// </summary>
    [Fact(Skip = "deferred: requires running NATS server")]
    public void JWTUser_AuthRequired_ShouldRejectUnauthenticated()
    { }

    /// <summary>
    /// Verifies server rejects connections when trusted keys don't match.
    /// Mirrors Go <c>TestJWTUserBadTrusted</c> — bad trusted key behavior.
    /// </summary>
    [Fact(Skip = "deferred: requires running NATS server")]
    public void JWTUserBadTrusted_ShouldRejectWithBadKeys()
    { }

    /// <summary>
    /// Verifies server rejects expired JWT tokens.
    /// Mirrors Go <c>TestJWTUserExpired</c>.
    /// </summary>
    [Fact(Skip = "deferred: requires running NATS server")]
    public void JWTUserExpired_ShouldRejectExpiredToken()
    { }

    /// <summary>
    /// Verifies that user permissions are set when connecting.
    /// Mirrors Go <c>TestJWTUserPermissionClaims</c>.
    /// </summary>
    [Fact(Skip = "deferred: requires running NATS server")]
    public void JWTUserPermissionClaims_ShouldApplyPermissionsOnConnect()
    { }

    /// <summary>
    /// Verifies response permissions are enforced on connected clients.
    /// Mirrors Go <c>TestJWTUserResponsePermissionClaims</c>.
    /// </summary>
    [Fact(Skip = "deferred: requires running NATS server")]
    public void JWTUserResponsePermissionClaims_ShouldAllowRequestReply()
    { }

    /// <summary>
    /// Verifies response permission defaults apply when none are explicitly set.
    /// Mirrors Go <c>TestJWTUserResponsePermissionClaimsDefaultValues</c>.
    /// </summary>
    [Fact(Skip = "deferred: requires running NATS server")]
    public void JWTUserResponsePermissionClaimsDefaultValues_ShouldApplyDefaults()
    { }

    /// <summary>
    /// Verifies negative response permission values are handled.
    /// Mirrors Go <c>TestJWTUserResponsePermissionClaimsNegativeValues</c>.
    /// </summary>
    [Fact(Skip = "deferred: requires running NATS server")]
    public void JWTUserResponsePermissionClaimsNegativeValues_ShouldHandleGracefully()
    { }

    /// <summary>
    /// Verifies server rejects connections when account claims are expired.
    /// Mirrors Go <c>TestJWTAccountExpired</c>.
    /// </summary>
    [Fact(Skip = "deferred: requires running NATS server")]
    public void JWTAccountExpired_ShouldRejectExpiredAccount()
    { }

    /// <summary>
    /// Verifies account expiry behavior after connection is established.
    /// Mirrors Go <c>TestJWTAccountExpiresAfterConnect</c>.
    /// </summary>
    [Fact(Skip = "deferred: requires running NATS server")]
    public void JWTAccountExpiresAfterConnect_ShouldConnectThenExpire()
    { }

    /// <summary>
    /// Verifies that JWT account limits on subscriptions are enforced.
    /// Mirrors Go <c>TestJWTAccountLimitsSubs</c>.
    /// </summary>
    [Fact(Skip = "deferred: requires running NATS server")]
    public void JWTAccountLimitsSubs_ShouldEnforceSubscriptionLimits()
    { }

    /// <summary>
    /// Verifies that JWT account max payload limits are applied.
    /// Mirrors Go <c>TestJWTAccountLimitsMaxPayload</c>.
    /// </summary>
    [Fact(Skip = "deferred: requires running NATS server")]
    public void JWTAccountLimitsMaxPayload_ShouldEnforcePayloadLimit()
    { }

    /// <summary>
    /// Verifies that JWT account max connection limits are enforced.
    /// Mirrors Go <c>TestJWTAccountLimitsMaxConns</c>.
    /// </summary>
    [Fact(Skip = "deferred: requires running NATS server")]
    public void JWTAccountLimitsMaxConns_ShouldEnforceConnectionLimit()
    { }
}