/* ========================================================================
 * Copyright (c) 2005-2022 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.Collections.Generic;
using System.Security.Cryptography.X509Certificates;
using System.Threading;
using System.Threading.Tasks;

namespace Opc.Ua.Client
{
    /// <summary>
    /// Object that creates instances of an Opc.Ua.Client.Session object.
    /// </summary>
    public class DefaultSessionFactory : ISessionFactory, ISessionInstantiator
    {
        /// <summary>
        /// The default instance of the factory.
        /// </summary>
        public static readonly DefaultSessionFactory Instance = new DefaultSessionFactory();

        /// <summary>
        /// Force use of the default instance.
        /// </summary>
        protected DefaultSessionFactory()
        {
        }

        #region ISessionFactory Members
        /// <inheritdoc/>
        public virtual Task<ISession> CreateAsync(
            ApplicationConfiguration configuration,
            ConfiguredEndpoint endpoint,
            bool updateBeforeConnect,
            string sessionName,
            uint sessionTimeout,
            IUserIdentity identity,
            IList<string> preferredLocales,
            CancellationToken ct = default)
        {
            return CreateAsync(configuration, endpoint, updateBeforeConnect, false, sessionName, sessionTimeout, identity, preferredLocales, ct);
        }

        /// <inheritdoc/>
        public async virtual Task<ISession> CreateAsync(
            ApplicationConfiguration configuration,
            ConfiguredEndpoint endpoint,
            bool updateBeforeConnect,
            bool checkDomain,
            string sessionName,
            uint sessionTimeout,
            IUserIdentity identity,
            IList<string> preferredLocales,
            CancellationToken ct = default)
        {
            return await Session.Create(this, configuration, (ITransportWaitingConnection)null, endpoint,
                updateBeforeConnect, checkDomain, sessionName, sessionTimeout,
                identity, preferredLocales, ct).ConfigureAwait(false);
        }

        /// <inheritdoc/>
        public async virtual Task<ISession> CreateAsync(
            ApplicationConfiguration configuration,
            ITransportWaitingConnection connection,
            ConfiguredEndpoint endpoint,
            bool updateBeforeConnect,
            bool checkDomain,
            string sessionName,
            uint sessionTimeout,
            IUserIdentity identity,
            IList<string> preferredLocales,
            CancellationToken ct = default)
        {
            return await Session.Create(this, configuration, connection, endpoint,
                updateBeforeConnect, checkDomain, sessionName, sessionTimeout,
                identity, preferredLocales, ct
                ).ConfigureAwait(false);
        }

        /// <inheritdoc/>
        public async virtual Task<ISession> CreateAsync(
            ApplicationConfiguration configuration,
            ReverseConnectManager reverseConnectManager,
            ConfiguredEndpoint endpoint,
            bool updateBeforeConnect,
            bool checkDomain,
            string sessionName,
            uint sessionTimeout,
            IUserIdentity userIdentity,
            IList<string> preferredLocales,
            CancellationToken ct = default
            )
        {
            if (reverseConnectManager == null)
            {
                return await this.CreateAsync(configuration, endpoint, updateBeforeConnect,
                    checkDomain, sessionName, sessionTimeout, userIdentity, preferredLocales, ct).ConfigureAwait(false);
            }

            ITransportWaitingConnection connection;
            do
            {
                connection = await reverseConnectManager.WaitForConnection(
                    endpoint.EndpointUrl,
                    endpoint.ReverseConnect?.ServerUri,
                    ct).ConfigureAwait(false);

                if (updateBeforeConnect)
                {
                    await endpoint.UpdateFromServerAsync(
                        endpoint.EndpointUrl, connection,
                        endpoint.Description.SecurityMode,
                        endpoint.Description.SecurityPolicyUri,
                        ct).ConfigureAwait(false);
                    updateBeforeConnect = false;
                    connection = null;
                }
            } while (connection == null);

            return await CreateAsync(
                configuration,
                connection,
                endpoint,
                false,
                checkDomain,
                sessionName,
                sessionTimeout,
                userIdentity,
                preferredLocales,
                ct).ConfigureAwait(false);
        }

        /// <inheritdoc/>
        public virtual ISession Create(
           ApplicationConfiguration configuration,
           ITransportChannel channel,
           ConfiguredEndpoint endpoint,
           X509Certificate2 clientCertificate,
           EndpointDescriptionCollection availableEndpoints = null,
           StringCollection discoveryProfileUris = null)
        {
            return Session.Create(this, configuration, channel, endpoint, clientCertificate, availableEndpoints, discoveryProfileUris);
        }

        /// <inheritdoc/>
        public virtual Task<ITransportChannel> CreateChannelAsync(
            ApplicationConfiguration configuration,
            ITransportWaitingConnection connection,
            ConfiguredEndpoint endpoint,
            bool updateBeforeConnect,
            bool checkDomain,
            CancellationToken ct = default)
        {
            return Session.CreateChannelAsync(configuration, connection, endpoint, updateBeforeConnect, checkDomain, ct);
        }

        /// <inheritdoc/>
        public virtual async Task<ISession> RecreateAsync(ISession sessionTemplate, CancellationToken ct = default)
        {
            if (!(sessionTemplate is Session template))
            {
                throw new ArgumentOutOfRangeException(nameof(sessionTemplate), "The ISession provided is not of a supported type.");
            }

            return await Session.RecreateAsync(template, ct).ConfigureAwait(false);
        }

        /// <inheritdoc/>
        public virtual async Task<ISession> RecreateAsync(ISession sessionTemplate, ITransportWaitingConnection connection, CancellationToken ct = default)
        {
            if (!(sessionTemplate is Session template))
            {
                throw new ArgumentOutOfRangeException(nameof(sessionTemplate), "The ISession provided is not of a supported type");
            }

            return await Session.RecreateAsync(template, connection, ct).ConfigureAwait(false);
        }

        /// <inheritdoc/>
        public virtual async Task<ISession> RecreateAsync(ISession sessionTemplate, ITransportChannel transportChannel, CancellationToken ct = default)
        {
            if (!(sessionTemplate is Session template))
            {
                throw new ArgumentOutOfRangeException(nameof(sessionTemplate), "The ISession provided is not of a supported type");
            }
            return await Session.RecreateAsync(template, transportChannel, ct).ConfigureAwait(false);
        }
        #endregion

        #region ISessionInstantiator Members
        /// <inheritdoc/>
        public virtual Session Create(
            ISessionChannel channel,
            ApplicationConfiguration configuration,
            ConfiguredEndpoint endpoint)
        {
            return new Session(channel, configuration, endpoint);
        }

        /// <inheritdoc/>
        public virtual Session Create(
            ITransportChannel channel,
            ApplicationConfiguration configuration,
            ConfiguredEndpoint endpoint,
            X509Certificate2 clientCertificate,
            EndpointDescriptionCollection availableEndpoints = null,
            StringCollection discoveryProfileUris = null)
        {
            return new Session(channel, configuration, endpoint, clientCertificate, availableEndpoints, discoveryProfileUris);
        }
        #endregion
    }
}