package eu.eudat.security.validators.facebook;

import eu.eudat.exceptions.security.NonValidTokenException;
import eu.eudat.exceptions.security.UnauthorisedException;
import eu.eudat.models.login.LoginInfo;
import eu.eudat.models.loginprovider.LoginProviderUser;
import eu.eudat.models.security.Principal;
import eu.eudat.security.validators.TokenValidator;
import eu.eudat.security.validators.TokenValidatorFactoryImpl;
import eu.eudat.services.ApiContext;
import eu.eudat.services.operations.AuthenticationServiceImpl;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.env.Environment;
import org.springframework.social.facebook.api.User;
import org.springframework.social.facebook.connect.FacebookServiceProvider;
import org.springframework.stereotype.Component;

import java.io.IOException;
import java.security.GeneralSecurityException;
import java.util.Calendar;
import java.util.Date;


@Component("facebookTokenValidator")
public class FacebookTokenValidator implements TokenValidator {

    private Environment environment;
    private ApiContext apiContext;
    private AuthenticationServiceImpl authenticationServiceImpl;
    private FacebookServiceProvider facebookServiceProvider;

    @Autowired
    public FacebookTokenValidator(Environment environment, ApiContext apiContext, AuthenticationServiceImpl authenticationServiceImpl) {
        this.environment = environment;
        this.apiContext = apiContext;
        this.authenticationServiceImpl = authenticationServiceImpl;
        this.facebookServiceProvider = new FacebookServiceProvider(this.environment.getProperty("facebook.login.clientId"), this.environment.getProperty("facebook.login.clientSecret"), this.environment.getProperty("facebook.login.namespace"));
    }

    @Override
    public Principal validateToken(LoginInfo credentials) throws NonValidTokenException, IOException, GeneralSecurityException {
        User profile = getFacebookUser(credentials.getTicket());
        LoginProviderUser user = new LoginProviderUser();
        if (profile.getEmail() == null)
            throw new UnauthorisedException("Cannot login user.Facebook account did not provide email");
        user.setEmail(profile.getEmail());
        user.setId(profile.getId());
        user.setIsVerified(profile.isVerified());
        user.setName(profile.getName());
        user.setProvider(TokenValidatorFactoryImpl.LoginProvider.FACEBOOK);
        user.setSecret(credentials.getTicket());
        return this.authenticationServiceImpl.Touch(user);
    }


    private User getFacebookUser(String accessToken) {
        String[] fields = {"id", "email", "first_name", "last_name", "name", "verified"};
        User profile = this.facebookServiceProvider.getApi(accessToken).fetchObject("me", User.class, fields);
        return profile;
    }

    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;
    }
}