using System.Collections.Generic;
using System.Windows;
using Chernobyl.Collections.Generic;
using Chernobyl.Destruction;
using Chernobyl.Plugin;
using Chernobyl.Dependency.Autofac;
using Autofac;

namespace Chernobyl.App
{
    /// <summary>
    /// Interaction logic for App.xaml
    /// </summary>
    public partial class App : Application
    {
        /// <summary>
        /// Constructor.
        /// </summary>
        public App()
        {
            (_serviceContainer, _plugins) = _builder.LoadPlugins();

            var dicts = _serviceContainer.Resolve<IEnumerable<ResourceDictionary>>();
            Resources.MergedDictionaries.AddRange(dicts);
        }

        /// <summary>
        /// Configures the application. Invoked when the <see cref="Application.Startup"/> event is
        /// raised.
        /// </summary>
        void OnStartup(object sender, StartupEventArgs e)
        {
            // Note: we create the window here rather than the constructor to ensure that the
            // DataTemplates from the app.xaml dictionaries are ready to go. Doing this in the
            // constructor will cause the expected DataTemplate to not display in the window.

            _serviceContainer.Resolve<Window>().Show();
        }

        /// <summary>
        /// Disposes of resources when the application is shutdown. Invoked when the
        /// <see cref="Application.Exit"/> event is raised.
        /// </summary>
        void OnExit(object sender, ExitEventArgs e)
        {
            _plugins.Dispose();
            _serviceContainer.Dispose();
        }

        // Provides dependency injection services.
        readonly ContainerBuilder _builder = new ContainerBuilder();

        // Services loaded from this app and the plugin modules.
        readonly IContainer _serviceContainer;

        // Plugins loaded from the modules.
        readonly IEnumerable<TryDisposable<IPlugin>> _plugins;
    }
}