package de.mpiwg.gazetteer.utils;


import java.io.IOException;
import java.util.Date;
import java.util.List;
import java.util.logging.Logger;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.lang.StringUtils;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import de.mpiwg.gazetteer.bo.LGFile;
import de.mpiwg.gazetteer.dataverse.DataverseUtils;


public class UpdateFileStatus extends HttpServlet{
	

	private static final Logger logger = Logger.getLogger(UpdateFileStatus.class.getName());

	
	public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// Set response content type
		response.setContentType("application/json");
		response.setCharacterEncoding("UTF-8");
		
		JSONObject jsonResponse = new JSONObject();	
		
		String datasetId = request.getParameter("datasetId");
		//logger.info("datasetId: " + datasetId);
		
		JSONObject filesJson = DataverseUtils.getAllFilesInDataset(datasetId);
		
		String datasetPersistentId = request.getParameter("datasetPersistentId");
		logger.info("sync files for dataset: " + datasetPersistentId);
		
		try {
			
			if(StringUtils.equals(filesJson.getString("status"), "OK")){
				// get all files with "datasetPersistentId=datasetPersistentId" from db
				List<LGFile> filesInLGFile = DBService.getLGFileInDatasetFromDB(datasetPersistentId);
				
				//logger.info("files in dataset in LGServices: " + filesInLGFile);
				//logger.info("files: ");
				
				// find files in the "filesInLGFile" but not in the "filesJson"
				JSONArray data = filesJson.getJSONArray("data");
				
				for (int i = 0; i < filesInLGFile.size(); i ++) {
					Long fileIdInDv = filesInLGFile.get(i).getFileIdInDv();
					boolean updateFileIdInDv2Null = true;
					
					for (int j = 0 ; j < data.length(); j ++) {
						int id = data.getJSONObject(j).getJSONObject("datafile").getInt("id");
						//logger.info("id= "+id + ", fileIdInDv= "+fileIdInDv);
						
						if (id == fileIdInDv) {
							// found file, so don't update fileIdInDv
							updateFileIdInDv2Null = false;
							break;
						}
					}
					
					if (updateFileIdInDv2Null) {
						// update file in LGServices database.File
						logger.info("update fileIdInDv2=" + fileIdInDv + " for file (id): " + filesInLGFile.get(i).getId() );
						filesInLGFile.get(i).setFileIdInDv(null);
						
						Date date = new Date();
						DBService.saveDBEntry(filesInLGFile.get(i), date);
					}
				}
				
				jsonResponse.put("status", "OK");
			}
		} catch (JSONException e1) {
			e1.printStackTrace();
		}
		
		// ======================
    
		response.setHeader("Access-Control-Allow-Origin", "*");
        
		java.io.PrintWriter out = response.getWriter();
		out.print(jsonResponse);
		out.flush();
		
	}
}