package eu.eudat.security.validators;

import java.io.FileReader;
import java.io.IOException;
import java.security.GeneralSecurityException;
import java.security.Principal;
import java.util.*;
import java.util.stream.Collector;
import java.util.stream.Collectors;

import com.google.api.client.googleapis.auth.oauth2.*;
import eu.eudat.dao.entities.security.CredentialDao;
import eu.eudat.dao.entities.security.UserTokenDao;
import eu.eudat.entities.Credential;
import eu.eudat.entities.UserToken;
import eu.eudat.models.criteria.UserInfoCriteria;
import eu.eudat.models.login.LoginInfo;
import eu.eudat.services.AuthenticationService;
import org.springframework.beans.factory.annotation.Autowired;

import com.google.api.client.googleapis.auth.oauth2.GoogleIdToken.Payload;
import com.google.api.client.http.HttpTransport;
import com.google.api.client.http.javanet.NetHttpTransport;
import com.google.api.client.json.jackson2.JacksonFactory;

import eu.eudat.dao.entities.UserInfoDao;
import eu.eudat.entities.UserInfo;
import eu.eudat.exceptions.NonValidTokenException;
import org.springframework.stereotype.Component;
import org.springframework.stereotype.Service;

import static com.sun.org.apache.xalan.internal.xsltc.compiler.Constants.REDIRECT_URI;

@Component
public class GoogleTokenValidator implements TokenValidator {

	private static final JacksonFactory jacksonFactory = new JacksonFactory();
	private static final HttpTransport transport = new NetHttpTransport();

	@Autowired private UserInfoDao userInfoDao;
	@Autowired private CredentialDao credentialDao;
	@Autowired private AuthenticationService authenticationService;
	@Autowired private UserTokenDao userTokenDao;
	private GoogleIdTokenVerifier verifier;
	public GoogleTokenValidator(){
		verifier = new GoogleIdTokenVerifier.Builder(transport, JacksonFactory.getDefaultInstance())
				.setAudience(Collections.singletonList("524432312250-sc9qsmtmbvlv05r44onl6l93ia3k9deo.apps.googleusercontent.com"))
				// Or, if multiple clients access the backend:
				//.setAudience(Arrays.asList(CLIENT_ID_1, CLIENT_ID_2, CLIENT_ID_3))
				.build();
	}

	private GoogleIdToken verifyUserAndGetUser(String idTokenString) throws IOException, GeneralSecurityException {

		GoogleIdToken idToken = verifier.verify(idTokenString);

		return idToken;
	}

	@Override
	public eu.eudat.models.security.Principal validateToken(String token) throws NonValidTokenException, IOException, GeneralSecurityException {

		GoogleIdToken idToken = this.verifyUserAndGetUser(token);
		Payload payload = idToken.getPayload();

		UserInfoCriteria criteria = new UserInfoCriteria();
		criteria.setEmail(payload.getEmail());
		UserInfo userInfo = userInfoDao.getWithCriteria(criteria).toList().get(0);

		final Credential credential = new Credential();
		credential.setCreationTime(new Date());
		credential.setStatus(1);
		credential.setLastUpdateTime(new Date());
		credential.setProvider(1);
		credential.setSecret(token);
		credential.setPublicValue(userInfo.getName());
		if(userInfo == null) {
			credential.setId(UUID.randomUUID());
			userInfo = new UserInfo();
			userInfo.setName((String)payload.get("name"));
			userInfo.setVerified_email(payload.getEmailVerified());
			userInfo.setEmail(payload.getEmail());
			userInfo.setCreated(new Date());
			userInfo.setLastloggedin(new Date());
			userInfo.setAuthorization_level(new Short("1"));
			userInfo.setUsertype(new Short("1"));
			userInfo = userInfoDao.createOrUpdate(userInfo);
			credential.setUserInfo(userInfo);
			credentialDao.createOrUpdate(credential);
		}
		else {
			userInfo.setLastloggedin(new Date());
			Set<Credential> credentials = userInfo.getCredentials();
			if(credentials.contains(credential)){
				Credential oldCredential = credentials.stream().filter(item->credential.getProvider().equals(item.getProvider())).findFirst().get();
				credential.setId(oldCredential.getId());
			}
			else{
				credential.setUserInfo(userInfo);
				credential.setId(UUID.randomUUID());
				credentialDao.createOrUpdate(credential);
				userInfo.getCredentials().add(credential);
			}
			userInfo = userInfoDao.createOrUpdate(userInfo);

		}

		UserToken userToken = new UserToken();
		userToken.setUser(userInfo);
		userToken.setIssuedAt(new Date());
		userToken.setToken(UUID.randomUUID());
		userToken.setExpiresAt(addADay(new Date()));
		userTokenDao.create(userToken);
		return authenticationService.Touch(userToken.getToken());
	  
	}
	
	private Date addADay(Date date){
		Date dt = new Date();
		Calendar c = Calendar.getInstance();
		c.setTime(dt);
		c.add(Calendar.DATE, 1);
		dt = c.getTime();
		return dt;
	}
	
	
	
}