package org.hathitrust.extractedfeatures;

import java.io.IOException;
import org.apache.spark.api.java.function.Function;
import org.apache.spark.util.DoubleAccumulator;
import org.bson.Document;
import org.json.JSONObject;

import com.mongodb.MongoClient;
import com.mongodb.MongoClientURI;
import com.mongodb.MongoException;
import com.mongodb.client.MongoCollection;
import com.mongodb.client.MongoDatabase;


class PerVolumeMongoDBDocumentsMap implements Function<String, Integer>
{
	private static final long serialVersionUID = 1L;
	
	protected String _input_dir;
	protected int    _verbosity;
	
	protected DoubleAccumulator _progress_accum;
	protected double            _progress_step;
	
	boolean _strict_file_io;
	
	public PerVolumeMongoDBDocumentsMap(String input_dir, int verbosity, 
					 		  DoubleAccumulator progress_accum, double progress_step,
					 		  boolean strict_file_io)
	{
		_input_dir  = input_dir;
		_verbosity  = verbosity;
		
		_progress_accum = progress_accum;
		_progress_step  = progress_step;
		
		_strict_file_io = strict_file_io;
	}
	
	public Integer call(String json_file_in) throws IOException
	{ 
		try {
			MongoClientURI mongo_url = new MongoClientURI("mongodb://gc3:27017,gc4:27017,gc5:27017");
			MongoClient mongoClient = new MongoClient(mongo_url);
			
			MongoDatabase database = mongoClient.getDatabase("htrc_ef");
			MongoCollection<Document> collection = database.getCollection("volumes");
			
			String full_json_file_in = _input_dir + "/" + json_file_in;
			System.out.println("Processing: " + full_json_file_in);
			String extracted_feature_json_doc = ClusterFileIO.readTextFile(full_json_file_in);
			
			Document doc = Document.parse(extracted_feature_json_doc);
			collection.insertOne(doc);		
			
			/*
			//Mongo mongo = new Mongo("localhost", 27017);
			MongoClient mongo = new MongoClient( "localhost" , 27017 );
			
			DB db = mongo.getDB("yourdb");
			DBCollection coll = db.getCollection("dummyColl");

			// convert JSON to DBObject directly
			DBObject dbObject = (DBObject) JSON
					.parse("{'name':'mkyong', 'age':30}");
			coll.insert(dbObject);

			
			DBCursor cursorDoc = coll.find();
			while (cursorDoc.hasNext()) {
				System.out.println(cursorDoc.next());
			}

			System.out.println("Done");
*/
			mongoClient.close();
			
		} catch (MongoException e) {
			e.printStackTrace();
		}

		return 1;
	}
	public Integer callPageCount(String json_file_in) throws IOException
	{ 
	    Integer page_count = 0;
	    
		String full_json_file_in = _input_dir + "/" + json_file_in;
		JSONObject extracted_feature_record = JSONClusterFileIO.readJSONFile(full_json_file_in);
		
		if (extracted_feature_record != null) {
			String volume_id = extracted_feature_record.getString("id");

			JSONObject ef_features = extracted_feature_record.getJSONObject("features");

			if (_verbosity >= 1) {
				System.out.println("Processing: " + json_file_in);
			}

			if (ef_features != null) {
				String page_count_str = ef_features.getString("pageCount");
				if (!page_count_str.equals("")) {
					page_count = Integer.parseInt(page_count_str);
						}
				else {
					System.err.println("No 'pageCount' in 'features' in volume id '" + volume_id + "' => defaulting to 0");
				}
			}
			else {
				System.err.println("No 'features' section in JSON file => Skipping id: " + volume_id);
			}
			
		}
		else {
			// File did not exist, or could not be parsed
			String mess = "Failed to read in bzipped JSON file '" + full_json_file_in + "'";
			if (_strict_file_io) {
				throw new IOException(mess);
			}
			else {
				System.err.println("Warning: " + mess);
				System.out.println("Warning: " + mess);
			}
		}

		_progress_accum.add(_progress_step);
		
		return page_count;
	}
	
	
}