/* ========================================================================
 * Copyright (c) 2005-2025 The OPC Foundation, Inc. All rights reserved.
 *
 * OPC Foundation MIT License 1.00
 *
 * Permission is hereby granted, free of charge, to any person
 * obtaining a copy of this software and associated documentation
 * files (the "Software"), to deal in the Software without
 * restriction, including without limitation the rights to use,
 * copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following
 * conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * The complete license agreement can be found here:
 * http://opcfoundation.org/License/MIT/1.00/
 * ======================================================================*/

using System;
using System.Threading;
using System.Threading.Tasks;

namespace Opc.Ua.Server
{
    /// <summary>
    /// The Server Configuration Node Manager.
    /// </summary>
    public interface IConfigurationNodeManager : IAsyncNodeManager
    {
        /// <summary>
        /// Raised when the <c>DefaultRolePermissions</c> or <c>DefaultUserRolePermissions</c>
        /// property of any <see cref="NamespaceMetadataState"/> node changes.
        /// Subscribers should invalidate any cached role-permission validation results.
        /// </summary>
        event EventHandler DefaultPermissionsChanged;

        /// <summary>
        /// Gets or creates the <see cref="NamespaceMetadataState"/> node for the specified NamespaceUri.
        /// </summary>
        ValueTask<NamespaceMetadataState> CreateNamespaceMetadataStateAsync(string namespaceUri, CancellationToken cancellationToken = default);

        /// <summary>
        /// Creates the configuration node for the server.
        /// </summary>
        void CreateServerConfiguration(ServerSystemContext systemContext, ApplicationConfiguration configuration);

        /// <summary>
        /// Gets and returns the <see cref="NamespaceMetadataState"/> node associated with the specified NamespaceUri
        /// </summary>
        ValueTask<NamespaceMetadataState?> GetNamespaceMetadataStateAsync(string namespaceUri, CancellationToken cancellationToken = default);

        /// <summary>
        /// Gets and returns the <see cref="NamespaceMetadataState"/> node associated with the specified namespace index
        /// </summary>
        ValueTask<NamespaceMetadataState?> GetNamespaceMetadataStateAsync(ushort namespaceIndex, CancellationToken cancellationToken = default);

        /// <summary>
        /// Binds the standard KeyCredentialConfiguration folder to the supplied push subject.
        /// </summary>
        ValueTask BindKeyCredentialPushAsync(
            KeyCredentialPushSubject subject,
            CancellationToken cancellationToken = default);

        /// <summary>
        /// Determine if the impersonated user has admin access.
        /// </summary>
        /// <exception cref="ServiceResultException"/>
        /// <seealso cref="StatusCodes.BadUserAccessDenied"/>
        void HasApplicationSecureAdminAccess(ISystemContext context);

        /// <summary>
        /// Determine if the impersonated user has admin access.
        /// </summary>
        /// <exception cref="ServiceResultException"/>
        /// <seealso cref="StatusCodes.BadUserAccessDenied"/>
        void HasApplicationSecureAdminAccess(ISystemContext context, CertificateStoreIdentifier trustedStore);

        /// <summary>
        /// Starts periodic evaluation of <c>CertificateExpired</c> and
        /// <c>TrustListOutOfDate</c> alarms per OPC 10000-12 §7.8.3.
        /// Call this after the server is fully started so that
        /// <c>SetActiveState</c> can safely emit event notifications.
        /// </summary>
        /// <param name="interval">
        /// Evaluation interval. A typical value is 60 seconds.
        /// </param>
        void StartAlarmMonitoring(TimeSpan interval);

        /// <summary>
        /// Stops the periodic alarm evaluation.
        /// </summary>
        void StopAlarmMonitoring();
    }
}