using Lucene.Net.Index;
using Portoa.Logging;
using Portoa.Persistence;
using VideoGameQuotes.Api.Persistence;

namespace VideoGameQuotes.Api.Search.Lucene {
	public class LuceneEntityIndexBuilder<T> : ISearchIndexBuilder<T> where T : Entity<T, int> {
		private readonly ILogger logger;
		private readonly IndexWriter indexWriter;
		private readonly ISearchService<T> searchService;
		private readonly ILuceneDocumentHandler<T> documentHandler;

		public LuceneEntityIndexBuilder(IndexWriter indexWriter, ISearchService<T> searchService, ILuceneDocumentHandler<T> documentHandler, ILogger logger) {
			this.indexWriter = indexWriter;
			this.searchService = searchService;
			this.documentHandler = documentHandler;
			this.logger = logger;
		}

		public void BuildIndex() {
			logger.Info("Building lucene index");
			foreach (var quote in searchService.GetAllIndexableRecords()) {
				indexWriter.AddDocument(documentHandler.BuildDocument(quote));
			}

			indexWriter.Optimize();
			indexWriter.Commit();
			logger.Info("Finished building lucene index");
		}

		public void UpdateIndex(T entity) {
			if (entity.IsTransient()) {
				throw new SearchIndexException(string.Format("Cannot add a transient entity to the index ({0})", entity));
			}

			logger.Info(string.Format("Updating index for {0}", entity));
			//delete current document, if it exists
			indexWriter.DeleteDocuments(documentHandler.GetIdTerm(entity));
			indexWriter.AddDocument(documentHandler.BuildDocument(entity));

			indexWriter.Commit();
			logger.Info(string.Format("Finished updating index for {0}", entity));
		}
	}
}