package rest.entities;

import java.io.IOException;
import java.io.PrintStream;
import java.util.List;
import java.util.UUID;

import javax.transaction.Transactional;

import org.apache.commons.lang3.SerializationUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.util.MultiValueMap;
import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;

import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;

import dao.entities.DMPDao;
import dao.entities.DMPProfileDao;
import dao.entities.DataRepositoryDao;
import dao.entities.DatasetDao;
import dao.entities.DatasetProfileDao;
import dao.entities.DatasetProfileRulesetDao;
import dao.entities.DatasetProfileViewstyleDao;
import dao.entities.OrganisationDao;
import dao.entities.ProjectDao;
import dao.entities.RegistryDao;
import dao.entities.ResearcherDao;
import dao.entities.ServiceDao;
import entities.DMP;
import entities.DMPProfile;
import entities.Dataset;
import entities.DatasetProfile;
import entities.DatasetProfileRuleset;
import entities.DatasetProfileViewstyle;
import entities.Project;
import helpers.Transformers;
import responses.RestResponse;


@RestController
@CrossOrigin
public class Datasets  {
	
	@Autowired private DataRepositoryDao dataRepositoryDao;
	@Autowired private DatasetDao datasetDao;
	@Autowired private DatasetProfileDao datasetProfileDao;
	@Autowired private DatasetProfileRulesetDao datasetProfileRulesetDao;
	@Autowired private DatasetProfileViewstyleDao datasetProfileViewstyleDao;
	@Autowired private DMPDao dMPDao;
	@Autowired private DMPProfileDao dMPProfileDao;
	@Autowired private OrganisationDao organisationDao;
	@Autowired private ProjectDao projectDao;
	@Autowired private RegistryDao registryDao;
	@Autowired private ResearcherDao researcherDao;
	@Autowired private ServiceDao serviceDao;
	
	private ObjectMapper objectMapper = new ObjectMapper();
	
	
	// FETCH BY DATASET(S)
	
	@RequestMapping(method = RequestMethod.GET, value = { "/dataset" })
	public @ResponseBody ResponseEntity<Object> listDatasets(){
		try {
			List<UUID> allIDs = datasetDao.listAllIDs();
			return ResponseEntity.status(HttpStatus.OK).body(new ObjectMapper().writeValueAsString(allIDs));
		}
		catch(Exception ex) {
			return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).body("Serialization issue: "+ex.getMessage());
		}
	}
	
	
	@RequestMapping(method = RequestMethod.GET, value = { "/dataset/{id}" })
	public @ResponseBody ResponseEntity<Object> getDataset(@PathVariable("id") String id) {
		try {
			Dataset ds = datasetDao.read(UUID.fromString(id));
			return ResponseEntity.status(HttpStatus.OK).body(new ObjectMapper().writeValueAsString(ds));
		}
		catch(Exception ex) {
			return ResponseEntity.status(HttpStatus.BAD_REQUEST).body("Erroneous input: "+ex.getMessage());
		}
	}
	
	
	/**
	 * This should be called on extreme cases. It's computationally intensive
	 */
	@RequestMapping(method = RequestMethod.GET, value = { "/getAllDatasets" })
	public @ResponseBody ResponseEntity<Object> getAllDatasets(){
		try {
			List<Dataset> allDatasets = datasetDao.getAll();
			return ResponseEntity.status(HttpStatus.OK).body(new ObjectMapper().writeValueAsString(allDatasets));
		}
		catch(Exception ex) {
			return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).body("Serialization issue: "+ex.getMessage());
		}
	}
	
	
	@RequestMapping(method = RequestMethod.POST, value = { "/setDataset" }, consumes = "application/json")
	public @ResponseBody ResponseEntity<Object> setDataset(@RequestBody Dataset dataset) {
		
		String reason = "";
		Dataset storedDataset = null;
		//try first to create
		try {
			storedDataset = datasetDao.create(dataset);
			RestResponse rr = new RestResponse("Created dataset with id: "+storedDataset.toString(), storedDataset.getId().toString());
			return ResponseEntity.status(HttpStatus.CREATED).body(rr.toString());
		}
		catch(Exception e) {
			e.printStackTrace();
			reason += e.getMessage();
			//try updating
			try {
				storedDataset = datasetDao.update(dataset);
				RestResponse rr = new RestResponse("Updated dataset with id: "+storedDataset.toString(), storedDataset.getId().toString());
				return ResponseEntity.status(HttpStatus.CREATED).body(rr.toString());
			}
			catch(Exception ex) {
				ex.printStackTrace();
				reason += (System.lineSeparator()+e.getMessage());
				return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).body("Could not create or update Dataset! Reason: " + reason);
			}
		}
		
	}
	
	
	
	
	
	
	
	@RequestMapping(method = RequestMethod.POST, value = { "/deleteDataset" }, consumes = "application/json")
	public @ResponseBody ResponseEntity<Object> deleteDataset(@RequestBody Dataset dataset) {
		
		//if we want to make sure it won't cascade up to other (child) components, we can just unhook them by setting them = new ones 
		// e.g: DMP dmp = new DMP() and then dataset.setDMP(dmp)
		try {
			datasetDao.delete(dataset);
			RestResponse rr = new RestResponse("Deleted dataset with id: "+dataset.getId().toString(), dataset.getId().toString());
			return ResponseEntity.status(HttpStatus.OK).body(rr.toString());
		}
		catch(Exception e) {
			e.printStackTrace();
			return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).body("Could not delete Dataset! Reason: " + e.getMessage());
		}
	}
	
	@RequestMapping(method = RequestMethod.GET, value = { "/assignDMPToDataset" })
	public @ResponseBody ResponseEntity<Object> assignDMPToDataset(@RequestParam("datasetID") String datasetID, @RequestParam("dmpID") String dmpID) {

		Dataset dataset = null;
		try {
			dataset = datasetDao.read(UUID.fromString(datasetID));
			if(dataset==null || dataset.getId()==null) throw new Exception("Could not find a Dataset by this id");
			DMP dmp = new DMP();
			dmp.setId(UUID.fromString(dmpID));
			dataset.setDmp(dmp);
			datasetDao.update(dataset);
			return ResponseEntity.status(HttpStatus.OK).build();
		}
		catch(Exception ex) {
			return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).build();
		}
		
	}
	
	
	/*
	@RequestMapping(method = RequestMethod.GET, value = { "/createEmptyDataset" })
	public @ResponseBody ResponseEntity<Object> createEmptyDataset() {
		Dataset dataset = new Dataset();
		dataset.setLabel("");
		
		try {
			dataset = datasetDao.create(dataset);
		}
		catch(Exception e) {
			e.printStackTrace();
			try {
				dataset = datasetDao.update(dataset);
			}
			catch(Exception ex) {
				ex.printStackTrace();
				return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).body("FAILED: reason: "+e.getMessage());
			}
		}
		return ResponseEntity.status(HttpStatus.CREATED).body("Created Dataset with id: " + dataset.getId());
	}
	*/
	
	
	//FETCH BY DATASET PROFILE
	
	@RequestMapping(method = RequestMethod.GET, value = { "/datasetprofile/{id}" })
	public @ResponseBody ResponseEntity<Object> getDatasetProfile(@PathVariable("id") String id) {
		try {
			DatasetProfile profile = datasetProfileDao.read(UUID.fromString(id));
			return ResponseEntity.status(HttpStatus.OK).body(new ObjectMapper().writeValueAsString(profile));
		}
		catch(Exception ex) {
			return ResponseEntity.status(HttpStatus.BAD_REQUEST).body("Erroneous input: "+ex.getMessage());
		}
	}
	
	
	
	
	
	
	//@Transactional
	@RequestMapping(method = RequestMethod.POST, value = { "/datasetprofile/set" }, consumes = "application/json", produces="application/json")
	public @ResponseBody ResponseEntity<Object> setDatasetProfile(@RequestBody DatasetProfile datasetProfile) {
		
		System.out.println("inside setDatasetProfile");
		try {
			System.out.println(objectMapper.writeValueAsString(datasetProfile));
		} catch (JsonProcessingException e) {
			e.printStackTrace();
		}
		
		if(datasetProfile.getRuleset()!=null && datasetProfile.getRuleset().getId()!=null){
			DatasetProfileRuleset dpr = datasetProfile.getRuleset();
			datasetProfileRulesetDao.update(dpr);
			DatasetProfileRuleset n = new DatasetProfileRuleset();
			n.setId(dpr.getId());
			datasetProfile.setRuleset(n);
		}
		
		if(datasetProfile.getViewstyle()!=null && datasetProfile.getViewstyle().getId()!=null){
			DatasetProfileViewstyle dpv = datasetProfile.getViewstyle();
			datasetProfileViewstyleDao.update(dpv);
			DatasetProfileViewstyle n = new DatasetProfileViewstyle();
			n.setId(dpv.getId());
			datasetProfile.setViewstyle(n);
		}
		
		datasetProfile.setDataset(null);
		
		DatasetProfile createdDatasetProfile = datasetProfileDao.update(datasetProfile);
		try {
			return ResponseEntity.status(HttpStatus.CREATED).body(objectMapper.writeValueAsString(createdDatasetProfile));
		} catch (JsonProcessingException e) {
			e.printStackTrace();
			return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).body("{\"msg\":\"Could not set dataset profile!\"}");
		}
		
	}
	
	
	
	@RequestMapping(method = RequestMethod.POST, value = { "/createEmptyDatasetProfile" })
	public @ResponseBody ResponseEntity<Object> createEmptyDatasetProfile(@RequestParam("datasetID") String datasetID) {
		
		DatasetProfileRuleset dpr = new DatasetProfileRuleset();
		dpr.setLabel("");
		dpr.setDefinition("");
		dpr.setId(datasetProfileRulesetDao.create(dpr).getId());
		
		DatasetProfileViewstyle dpv = new DatasetProfileViewstyle();
		dpv.setLabel("");
		dpv.setDefinition("");
		dpv.setId(datasetProfileViewstyleDao.create(dpv).getId());
		
		DatasetProfile datasetProfile = new DatasetProfile();
		datasetProfile.setLabel("");
		datasetProfile.setDefinition("");
		datasetProfile.setRuleset(dpr);
		datasetProfile.setViewstyle(dpv);
		
		Dataset ds = new Dataset();
		ds.setId(UUID.fromString(datasetID));
		datasetProfile.setDataset(ds);
		
		try {
			datasetProfile = datasetProfileDao.create(datasetProfile);
			return ResponseEntity.status(HttpStatus.CREATED).body(new ObjectMapper().writeValueAsString(datasetProfile));
		}
		catch(Exception e) {
			return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).body("FAILED: reason: "+e.getMessage());
		}
	}
	
	
	
	
}