using MediaBrowser.Common.Events;
using MediaBrowser.Common.Kernel;
using MediaBrowser.Common.Plugins;
using MediaBrowser.Controller.Entities;
using MediaBrowser.Controller.Library;
using MediaBrowser.Controller.Updates;
using MediaBrowser.Model.Logging;
using MediaBrowser.Model.Updates;
using System;

namespace MediaBrowser.ServerApplication
{
    /// <summary>
    /// Class WebSocketEvents
    /// </summary>
    public class WebSocketEvents : IDisposable
    {
        /// <summary>
        /// The _server manager
        /// </summary>
        private readonly IServerManager _serverManager;
        /// <summary>
        /// The _logger
        /// </summary>
        private readonly ILogger _logger;

        /// <summary>
        /// The _user manager
        /// </summary>
        private readonly IUserManager _userManager;

        /// <summary>
        /// The _library manager
        /// </summary>
        private readonly ILibraryManager _libraryManager;

        /// <summary>
        /// The _installation manager
        /// </summary>
        private readonly InstallationManager _installationManager;

        /// <summary>
        /// The _kernel
        /// </summary>
        private readonly IKernel _kernel;
        
        /// <summary>
        /// Initializes a new instance of the <see cref="WebSocketEvents" /> class.
        /// </summary>
        /// <param name="serverManager">The server manager.</param>
        /// <param name="logger">The logger.</param>
        /// <param name="userManager">The user manager.</param>
        public WebSocketEvents(IServerManager serverManager, IKernel kernel, ILogger logger, IUserManager userManager, ILibraryManager libraryManager, InstallationManager installationManager)
        {
            _serverManager = serverManager;
            _logger = logger;
            _userManager = userManager;
            _libraryManager = libraryManager;
            _installationManager = installationManager;
            _kernel = kernel;

            _userManager.UserDeleted += userManager_UserDeleted;
            _userManager.UserUpdated += userManager_UserUpdated;

            _libraryManager.LibraryChanged += libraryManager_LibraryChanged;

            kernel.HasPendingRestartChanged += kernel_HasPendingRestartChanged;

            installationManager.PluginUninstalled += InstallationManager_PluginUninstalled;
            installationManager.PackageInstalling += installationManager_PackageInstalling;
            installationManager.PackageInstallationCancelled += installationManager_PackageInstallationCancelled;
            installationManager.PackageInstallationCompleted += installationManager_PackageInstallationCompleted;
            installationManager.PackageInstallationFailed += installationManager_PackageInstallationFailed;
        }

        /// <summary>
        /// Installations the manager_ package installation failed.
        /// </summary>
        /// <param name="sender">The sender.</param>
        /// <param name="e">The e.</param>
        void installationManager_PackageInstallationFailed(object sender, GenericEventArgs<InstallationInfo> e)
        {
            _serverManager.SendWebSocketMessage("PackageInstallationFailed", e.Argument);
        }

        /// <summary>
        /// Installations the manager_ package installation completed.
        /// </summary>
        /// <param name="sender">The sender.</param>
        /// <param name="e">The e.</param>
        void installationManager_PackageInstallationCompleted(object sender, GenericEventArgs<InstallationInfo> e)
        {
            _serverManager.SendWebSocketMessage("PackageInstallationCompleted", e.Argument);
        }

        /// <summary>
        /// Installations the manager_ package installation cancelled.
        /// </summary>
        /// <param name="sender">The sender.</param>
        /// <param name="e">The e.</param>
        void installationManager_PackageInstallationCancelled(object sender, GenericEventArgs<InstallationInfo> e)
        {
            _serverManager.SendWebSocketMessage("PackageInstallationCancelled", e.Argument);
        }

        /// <summary>
        /// Installations the manager_ package installing.
        /// </summary>
        /// <param name="sender">The sender.</param>
        /// <param name="e">The e.</param>
        void installationManager_PackageInstalling(object sender, GenericEventArgs<InstallationInfo> e)
        {
            _serverManager.SendWebSocketMessage("PackageInstalling", e.Argument);
        }

        /// <summary>
        /// Handles the LibraryChanged event of the libraryManager control.
        /// </summary>
        /// <param name="sender">The source of the event.</param>
        /// <param name="e">The <see cref="ChildrenChangedEventArgs" /> instance containing the event data.</param>
        void libraryManager_LibraryChanged(object sender, ChildrenChangedEventArgs e)
        {
            _serverManager.SendWebSocketMessage("LibraryChanged", () => DtoBuilder.GetLibraryUpdateInfo(e));
        }

        /// <summary>
        /// Installations the manager_ plugin uninstalled.
        /// </summary>
        /// <param name="sender">The sender.</param>
        /// <param name="e">The e.</param>
        void InstallationManager_PluginUninstalled(object sender, GenericEventArgs<IPlugin> e)
        {
            _serverManager.SendWebSocketMessage("PluginUninstalled", e.Argument.GetPluginInfo());
        }

        /// <summary>
        /// Handles the HasPendingRestartChanged event of the kernel control.
        /// </summary>
        /// <param name="sender">The source of the event.</param>
        /// <param name="e">The <see cref="EventArgs" /> instance containing the event data.</param>
        void kernel_HasPendingRestartChanged(object sender, EventArgs e)
        {
            var kernel = (IKernel)sender;

            _serverManager.SendWebSocketMessage("HasPendingRestartChanged", kernel.GetSystemInfo());
        }

        /// <summary>
        /// Users the manager_ user updated.
        /// </summary>
        /// <param name="sender">The sender.</param>
        /// <param name="e">The e.</param>
        void userManager_UserUpdated(object sender, GenericEventArgs<User> e)
        {
            _serverManager.SendWebSocketMessage("UserUpdated", new DtoBuilder(_logger).GetDtoUser(e.Argument));
        }

        /// <summary>
        /// Users the manager_ user deleted.
        /// </summary>
        /// <param name="sender">The sender.</param>
        /// <param name="e">The e.</param>
        void userManager_UserDeleted(object sender, GenericEventArgs<User> e)
        {
            _serverManager.SendWebSocketMessage("UserDeleted", e.Argument.Id.ToString());
        }

        /// <summary>
        /// Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.
        /// </summary>
        public void Dispose()
        {
            Dispose(true);
        }

        /// <summary>
        /// Releases unmanaged and - optionally - managed resources.
        /// </summary>
        /// <param name="dispose"><c>true</c> to release both managed and unmanaged resources; <c>false</c> to release only unmanaged resources.</param>
        protected virtual void Dispose(bool dispose)
        {
            if (dispose)
            {
                _userManager.UserDeleted -= userManager_UserDeleted;
                _userManager.UserUpdated -= userManager_UserUpdated;

                _libraryManager.LibraryChanged -= libraryManager_LibraryChanged;

                _installationManager.PluginUninstalled -= InstallationManager_PluginUninstalled;
                _installationManager.PackageInstalling -= installationManager_PackageInstalling;
                _installationManager.PackageInstallationCancelled -= installationManager_PackageInstallationCancelled;
                _installationManager.PackageInstallationCompleted -= installationManager_PackageInstallationCompleted;
                _installationManager.PackageInstallationFailed -= installationManager_PackageInstallationFailed;

                _kernel.HasPendingRestartChanged -= kernel_HasPendingRestartChanged;
            }
        }
    }
}