package org.gcube.informationsystem.resourceregistry.context;

import java.net.HttpURLConnection;
import java.util.List;
import java.util.UUID;

import org.gcube.common.gxhttp.reference.GXConnection;
import org.gcube.common.gxhttp.request.GXHTTPStringRequest;
import org.gcube.informationsystem.model.impl.properties.HeaderImpl;
import org.gcube.informationsystem.model.reference.entities.Context;
import org.gcube.informationsystem.model.reference.properties.Header;
import org.gcube.informationsystem.resourceregistry.api.exceptions.ResourceRegistryException;
import org.gcube.informationsystem.resourceregistry.api.exceptions.context.ContextAlreadyPresentException;
import org.gcube.informationsystem.resourceregistry.api.exceptions.context.ContextNotFoundException;
import org.gcube.informationsystem.resourceregistry.api.rest.ContextPath;
import org.gcube.informationsystem.resourceregistry.api.rest.httputils.HTTPUtility;
import org.gcube.informationsystem.utils.ISMapper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * @author Luca Frosini (ISTI - CNR)
 */
public class ResourceRegistryContextClientImpl implements ResourceRegistryContextClient {
	
	private static final Logger logger = LoggerFactory.getLogger(ResourceRegistryContextClientImpl.class);
	
	protected final String address;
	
	public ResourceRegistryContextClientImpl(String address) {
		this.address = address;
		
	}
	
	protected String internalCreate(Context context) throws ContextAlreadyPresentException, ResourceRegistryException {
		try {
			Header header = context.getHeader();
			if(header == null) {
				header = new HeaderImpl(UUID.randomUUID());
				context.setHeader(header);
			}
			UUID uuid = context.getHeader().getUUID();
			
			String contextString = ISMapper.marshal(context);
			
			logger.trace("Going to create {}", contextString);
			
			GXHTTPStringRequest gxHTTPStringRequest = GXHTTPStringRequest.newRequest(address);
			gxHTTPStringRequest.from(ResourceRegistryContextClient.class.getSimpleName());
			gxHTTPStringRequest.header("Accept", GXConnection.APPLICATION_JSON_CHARSET_UTF_8);
			gxHTTPStringRequest.header("Content-type", GXConnection.APPLICATION_JSON_CHARSET_UTF_8);
			gxHTTPStringRequest.path(ContextPath.CONTEXTS_PATH_PART);
			gxHTTPStringRequest.path(uuid.toString());
			
			HttpURLConnection httpURLConnection = gxHTTPStringRequest.put(contextString);
			String c = HTTPUtility.getResponse(String.class, httpURLConnection);
			
			logger.trace("{} successfully created", c);
			return c;
			
		} catch(ResourceRegistryException e) {
			// logger.trace("Error Creating {}", facet, e);
			throw e;
		} catch(Exception e) {
			// logger.trace("Error Creating {}", facet, e);
			throw new RuntimeException(e);
		}
	}
	
	@Override
	public Context create(Context context) throws ContextAlreadyPresentException, ResourceRegistryException {
		try {
			String res = internalCreate(context);
			return ISMapper.unmarshal(Context.class, res);
		} catch(ResourceRegistryException e) {
			// logger.trace("Error Creating {}", facet, e);
			throw e;
		} catch(Exception e) {
			// logger.trace("Error Creating {}", facet, e);
			throw new RuntimeException(e);
		}
	}
	
	@Override
	public String create(String context) throws ContextAlreadyPresentException, ResourceRegistryException {
		try {
			Context c = ISMapper.unmarshal(Context.class, context);
			return internalCreate(c);
		} catch(ResourceRegistryException e) {
			// logger.trace("Error Creating {}", facet, e);
			throw e;
		} catch(Exception e) {
			// logger.trace("Error Creating {}", facet, e);
			throw new RuntimeException(e);
		}
	}
	
	@Override
	public Context read(Context context) throws ContextNotFoundException, ResourceRegistryException {
		return read(context.getHeader().getUUID());
	}
	
	@Override
	public Context read(UUID uuid) throws ContextNotFoundException, ResourceRegistryException {
		try {
			String res = read(uuid.toString());
			return ISMapper.unmarshal(Context.class, res);
		} catch(ResourceRegistryException e) {
			// logger.trace("Error Creating {}", facet, e);
			throw e;
		} catch(Exception e) {
			// logger.trace("Error Creating {}", facet, e);
			throw new RuntimeException(e);
		}
	}
	
	@Override
	public String read(String uuid) throws ContextNotFoundException, ResourceRegistryException {
		try {
			logger.trace("Going to read {} with UUID {}", Context.NAME, uuid);
			GXHTTPStringRequest gxHTTPStringRequest = GXHTTPStringRequest.newRequest(address);
			gxHTTPStringRequest.from(ResourceRegistryContextClient.class.getSimpleName());
			gxHTTPStringRequest.header("Accept", GXConnection.APPLICATION_JSON_CHARSET_UTF_8);
			gxHTTPStringRequest.path(ContextPath.CONTEXTS_PATH_PART);
			gxHTTPStringRequest.path(uuid);
			
			HttpURLConnection httpURLConnection = gxHTTPStringRequest.get();
			String c = HTTPUtility.getResponse(String.class, httpURLConnection);
			
			logger.debug("Got {} is {}", Context.NAME, c);
			return c;
			
		} catch(ResourceRegistryException e) {
			// logger.trace("Error Creating {}", facet, e);
			throw e;
		} catch(Exception e) {
			// logger.trace("Error Creating {}", facet, e);
			throw new RuntimeException(e);
		}
	}
	
	public String internalUpdate(Context context) throws ResourceRegistryException {
		try {
			String contextString = ISMapper.marshal(context);
			logger.trace("Going to update {}", contextString);
			
			UUID uuid = context.getHeader().getUUID();
			
			GXHTTPStringRequest gxHTTPStringRequest = GXHTTPStringRequest.newRequest(address);
			gxHTTPStringRequest.from(ResourceRegistryContextClient.class.getSimpleName());
			gxHTTPStringRequest.header("Accept", GXConnection.APPLICATION_JSON_CHARSET_UTF_8);
			gxHTTPStringRequest.header("Content-type", GXConnection.APPLICATION_JSON_CHARSET_UTF_8);
			gxHTTPStringRequest.path(ContextPath.CONTEXTS_PATH_PART);
			gxHTTPStringRequest.path(uuid.toString());
			
			HttpURLConnection httpURLConnection = gxHTTPStringRequest.put(contextString);
			String c = HTTPUtility.getResponse(String.class, httpURLConnection);
			
			logger.trace("{} successfully updated", c);
			return c;
			
		} catch(ResourceRegistryException e) {
			// logger.trace("Error Creating {}", facet, e);
			throw e;
		} catch(Exception e) {
			// logger.trace("Error Creating {}", facet, e);
			throw new RuntimeException(e);
		}
	}
	
	@Override
	public Context update(Context context) throws ResourceRegistryException {
		try {
			String res = internalUpdate(context);
			return ISMapper.unmarshal(Context.class, res);
		} catch(ResourceRegistryException e) {
			// logger.trace("Error Updating {}", facet, e);
			throw e;
		} catch(Exception e) {
			// logger.trace("Error Updating {}", facet, e);
			throw new RuntimeException(e);
		}
	}
	
	@Override
	public String update(String context) throws ResourceRegistryException {
		try {
			Context c = ISMapper.unmarshal(Context.class, context);
			return internalUpdate(c);
		} catch(ResourceRegistryException e) {
			// logger.trace("Error Updating {}", facet, e);
			throw e;
		} catch(Exception e) {
			// logger.trace("Error Updating {}", facet, e);
			throw new RuntimeException(e);
		}
	}
	
	@Override
	public boolean delete(Context context) throws ContextNotFoundException, ResourceRegistryException {
		return delete(context.getHeader().getUUID());
	}
	
	@Override
	public boolean delete(UUID uuid) throws ContextNotFoundException, ResourceRegistryException {
		return delete(uuid.toString());
	}
	
	@Override
	public boolean delete(String uuid) throws ContextNotFoundException, ResourceRegistryException {
		try {
			logger.trace("Going to delete {} with UUID {}", Context.NAME, uuid);
			GXHTTPStringRequest gxHTTPStringRequest = GXHTTPStringRequest.newRequest(address);
			gxHTTPStringRequest.from(ResourceRegistryContextClient.class.getSimpleName());
			gxHTTPStringRequest.header("Accept", GXConnection.APPLICATION_JSON_CHARSET_UTF_8);
			gxHTTPStringRequest.path(ContextPath.CONTEXTS_PATH_PART);
			gxHTTPStringRequest.path(uuid);
			
			HttpURLConnection httpURLConnection = gxHTTPStringRequest.delete();
			boolean deleted = HTTPUtility.getResponse(Boolean.class, httpURLConnection);
			
			logger.info("{} with UUID {} {}", Context.NAME, uuid,
					deleted ? " successfully deleted" : "was NOT deleted");
			return deleted;
		} catch(ResourceRegistryException e) {
			// logger.trace("Error Creating {}", facet, e);
			throw e;
		} catch(Exception e) {
			// logger.trace("Error Creating {}", facet, e);
			throw new RuntimeException(e);
		}
	}
	
	@Override
	public List<Context> all() throws ResourceRegistryException {
		try {
			logger.trace("Going to read {} with UUID {}", Context.NAME);
			GXHTTPStringRequest gxHTTPStringRequest = GXHTTPStringRequest.newRequest(address);
			gxHTTPStringRequest.from(ResourceRegistryContextClient.class.getSimpleName());
			gxHTTPStringRequest.header("Accept", GXConnection.APPLICATION_JSON_CHARSET_UTF_8);
			gxHTTPStringRequest.path(ContextPath.CONTEXTS_PATH_PART);
			
			HttpURLConnection httpURLConnection = gxHTTPStringRequest.get();
			String all = HTTPUtility.getResponse(String.class, httpURLConnection);
			
			logger.debug("Got contexts are {}", Context.NAME, all);
			return ISMapper.unmarshalList(Context.class, all);
			
		} catch(ResourceRegistryException e) {
			// logger.trace("Error Creating {}", facet, e);
			throw e;
		} catch(Exception e) {
			// logger.trace("Error Creating {}", facet, e);
			throw new RuntimeException(e);
		}
	}
	
}