/* 
 * Copyright (c) 2009 Craig Sutherland
 * 
 * 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.
 */

using System;
using System.Collections.Generic;
using FastForward.WinCore.Configuration;
using ThoughtWorks.CruiseControl.Remote;
using ThoughtWorks.CruiseControl.Remote.Monitor;

namespace FastForward.WinCore
{
    /// <summary>
    /// Defines all the servers to be monitored.
    /// </summary>
    public class ServerList
        : IDisposable
    {
        #region Private fields
        private List<Server> servers = new List<Server>();
        private CruiseServerClientFactory factory = new CruiseServerClientFactory();
        #endregion

        #region Public properties
        #region Servers
        /// <summary>
        /// The monitored servers.
        /// </summary>
        public IEnumerable<Server> Servers
        {
            get { return servers; }
        }
        #endregion
        #endregion

        #region Public properties
        #region AddServer()
        /// <summary>
        /// Add a new server.
        /// </summary>
        /// <param name="value"></param>
        public void AddServer(ServerConfig value)
        {
            // Initialise the client and make sure there are no duplicates
            CruiseServerClientBase client = InitialiseClient(value);
            if (servers.Contains(value.Server))
            {
                throw new Exception(
                    string.Format("Duplicate server ({0}-{1})- unable to add server",
                        value.Address,
                        value.TargetServer));
            }

            // Initialise the watcher
            var watcher = new PollingServerWatcher(client);
            try
            {
                watcher.Interval = value.PollingInterval;
                value.Server = new Server(client, watcher);
            }
            catch
            {
                watcher.Dispose();
                throw;
            }

            servers.Add(value.Server);
            value.Server.Data.Set(value);

            // Tell any listeners
            FireServerAdded(value.Server);
        }
        #endregion

        #region InitialiseClient()
        /// <summary>
        /// Initialise the underlying client for a <see cref="ServerConfig"/>.
        /// </summary>
        /// <param name="value"></param>
        /// <returns></returns>
        public CruiseServerClientBase InitialiseClient(ServerConfig value)
        {
            CruiseServerClientBase client = null;
            switch (value.TransportMode)
            {
                case ServerTransportMode.Default:
                    client = factory.GenerateClient(value.Address, value.TargetServer, value.Settings);
                    break;
                case ServerTransportMode.Http:
                    client = factory.GenerateHttpClient(value.Address, value.TargetServer, value.Settings);
                    break;
                case ServerTransportMode.Remoting:
                    client = factory.GenerateRemotingClient(value.Address, value.TargetServer, value.Settings);
                    break;
                case ServerTransportMode.TcpCache:
                    client = InitialiseCacheConnection(value);
                    break;
            }
            return client;
        }
        #endregion

        #region RemoveServer
        /// <summary>
        /// Remove a server.
        /// </summary>
        /// <param name="server"></param>
        public void RemoveServer(Server server)
        {
            if (servers.Contains(server))
            {
                FireServerRemoved(server);
                servers.Remove(server);
                server.Dispose();
            }
        }

        /// <summary>
        /// Remove a server.
        /// </summary>
        /// <param name="value"></param>
        public void RemoveServer(ServerConfig value)
        {
            RemoveServer(value.Server);
        }
        #endregion

        #region UpdateServer()
        /// <summary>
        /// Update a server.
        /// </summary>
        /// <param name="value"></param>
        /// <remarks>
        /// This will remove the existing server and re-add it.
        /// </remarks>
        public void UpdateServer(ServerConfig value)
        {
            RemoveServer(value);
            AddServer(value);
        }
        #endregion

        #region Dispose()
        /// <summary>
        /// Clean up.
        /// </summary>
        public void Dispose()
        {
            foreach (var server in servers)
            {
                server.Dispose();
            }
        }
        #endregion

        #region InitialiseCacheConnection()
        /// <summary>
        /// Initialise a connection to a cache server.
        /// </summary>
        /// <param name="server"></param>
        /// <returns></returns>
        public static CruiseServerClientBase InitialiseCacheConnection(ServerConfig server)
        {
            var connection = new CacheTcpConnection(server.Address);
            var actualConnection = CruiseServerClientFactory.BuildUpConnection(connection, server.Settings);
            var client = new CruiseServerClient(actualConnection);
            client.TargetServer = server.TargetServer;
            return client;
        }
        #endregion
        #endregion

        #region Public events
        #region ServerAdded
        /// <summary>
        /// A new server has been added.
        /// </summary>
        public event EventHandler<ServerChangedArgs> ServerAdded;
        #endregion

        #region ServerRemoved
        /// <summary>
        /// An existing server has been removed.
        /// </summary>
        public event EventHandler<ServerChangedArgs> ServerRemoved;
        #endregion
        #endregion

        #region Protected methods
        #region FireServerAdded()
        /// <summary>
        /// Fires the <see cref="ServerAdded"/> event.
        /// </summary>
        /// <param name="server">The server that was added.</param>
        protected void FireServerAdded(Server server)
        {
            if (ServerAdded != null)
            {
                var args = new ServerChangedArgs(server);
                ServerAdded(this, args);
            }
        }
        #endregion

        #region FireServerRemoved()
        /// <summary>
        /// Fires the <see cref="ServerRemoved"/> event.
        /// </summary>
        /// <param name="server">The server that was added.</param>
        protected void FireServerRemoved(Server server)
        {
            if (ServerRemoved != null)
            {
                var args = new ServerChangedArgs(server);
                ServerRemoved(this, args);
            }
        }
        #endregion
        #endregion
    }
}