using System.Collections.Specialized;
using System.Configuration;
using System.IO;
using System.Reflection;
using Lucene.Net.Analysis;
using Lucene.Net.Analysis.Standard;
using Lucene.Net.Index;
using Lucene.Net.QueryParsers;
using Lucene.Net.Store;
using Microsoft.Practices.Unity;
using Microsoft.Practices.Unity.InterceptionExtension;
using Portoa.Lucene;
using Portoa.Persistence;
using Portoa.Search;
using Portoa.Web.Unity;
using Portoa.Web.Unity.Lifetime;
using VideoGameQuotes.Api;
using VideoGameQuotes.Web.Search;
using Directory = Lucene.Net.Store.Directory;
using Version = Lucene.Net.Util.Version;

namespace VideoGameQuotes.Web.Configuration {
	public class EnableSearchWithLucene : UnityContainerExtension {
		protected override void Initialize() {
			var indexWriterLifetimeManager = new ExplicitlyDisposableLifetimeManager<IndexWriter>(
				new ContainerControlledLifetimeManager(), 
				indexWriter => indexWriter.Close()
			);

			Container
				.RegisterType<Directory>(new ContainerControlledLifetimeManager(), new InjectionFactory(CreateIndexDirectory))
				.RegisterType<IndexWriter>(indexWriterLifetimeManager, new InjectionFactory(CreateIndexWriter))
				.RegisterInstance(Version.LUCENE_29)
				.RegisterType<Analyzer, StandardAnalyzer>(new InjectionConstructor(typeof(Version)))
				.RegisterType<QueryParser>(new InjectionFactory(CreateQueryParser))
				.RegisterAndIntercept(typeof(ISearcher<,>), typeof(LuceneEntitySearcher<,>))
				.RegisterAndIntercept(typeof(ISearchService<,>), typeof(SearchService<,>))
				.RegisterAndIntercept<ILuceneDocumentHandler<Quote>, QuoteDocumentHandler>()
				.RegisterAndIntercept(typeof(ISearchIndexBuilder<,>), typeof(LuceneEntityIndexBuilder<,>));

			Container
				.Configure<Interception>()
				.AddPolicy("UpdateSearchIndexPolicy")
				.AddCallHandler<UpdateSearchIndexCallHandler>()
				.AddMatchingRule(new QuoteUpdatedMatchingRule());
		}

		#region lucene-related factories
		private static QueryParser CreateQueryParser(IUnityContainer container) {
			return new QueryParser(container.Resolve<Version>(), "text", container.Resolve<Analyzer>());
		}

		private static Directory CreateIndexDirectory(IUnityContainer container) {
			var indexDirectory = ((NameValueCollection)ConfigurationManager.GetSection("vgquotes"))["luceneIndexDirectory"];
			return new SimpleFSDirectory(new DirectoryInfo(indexDirectory));
		}

		private static IndexWriter CreateIndexWriter(IUnityContainer container) {
			return new IndexWriter(container.Resolve<Directory>(), container.Resolve<Analyzer>(), true, IndexWriter.MaxFieldLength.UNLIMITED);
		}
		#endregion

		private class QuoteUpdatedMatchingRule : IMatchingRule {
			private static readonly MethodBase saveMethod = typeof(IRepository<Quote, int>).GetMethod("Save", new[] { typeof(Quote) });

			public bool Matches(MethodBase member) {
				return member == saveMethod;
			}
		}
	}
}