package com.example.cosmos_serversb.models;

import java.util.List;
import java.util.UUID;
import javax.inject.Singleton;

import com.example.cosmos_serversb.entities.*;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.boot.MetadataSources;
import org.hibernate.boot.registry.StandardServiceRegistry;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;


@Singleton
public class Users {
    private static Users theInstance = null;
    private static SessionFactory sessionFactory;
    private static String baseURI = "http://nitta-lab-www.is.konan-u.ac.jp/";
    private static String AppName = "cosmos";

    public static void setUp() {
        // A SessionFactory is set up once for an application!
        final StandardServiceRegistry registry = new StandardServiceRegistryBuilder()
                .configure() // configures settings from hibernate.cfg.xml
                .build();
        try {
            sessionFactory = new MetadataSources( registry ).buildMetadata().buildSessionFactory();
        }
        catch (Exception e) {
            // The registry would be destroyed by the SessionFactory, but we had trouble building the SessionFactory
            // so destroy it manually.
            StandardServiceRegistryBuilder.destroy( registry );
        }
    }

    public static void tearDown() {
        try {
            if (sessionFactory != null) {
                sessionFactory.close();
            }
        } catch (Exception e) {
            System.out.println("Exception!");
        }
    }

    private Users() {
        setUp();
    }

    public static Users getInstance() {
        if (theInstance == null) {
            theInstance = new Users();
        }
        return theInstance;
    }

    public static Token createToken(String uId) {
        //Tokenを作成しuIdと関連付けしDBに保存し作成したTokenを返す
        String token = UUID.randomUUID().toString();
        Token testToken =new Token(token, uId);
        Session session = sessionFactory.openSession();
        session.beginTransaction();
        session.save(testToken);
        session.getTransaction().commit();
        session.close();
        return testToken;
    }

    public static String createUId() {
        //uIdを作成し既存していないかチェック後DBに保存し作成したuIdを返す
        String uId = UUID.randomUUID().toString();
        return uId;
    }

    public static User createUser(String name, String pw, String iconImage) {
        String uId = getInstance().createUId();
        String uri = baseURI + AppName +"/users/" +uId;

        Session session = sessionFactory.openSession();
        session.beginTransaction();
        User testUser = new User(name, uId, uri, iconImage);//名前、uId、ユーザーuri、パスワード、アイコンイメージを保存
        session.save(testUser);
        //出力
//        List userResult = session.createQuery( "from User" ).list();
//        for ( User user : (List<User>) userResult ) {
//            System.out.println( "UserId (" + user.getuId() + ") : " + user.getUri() + ": " + user.getName());
//       }
        session.getTransaction().commit();
        session.close();
////        testUser.token.add(getInstance().createToken(testUser.uId));
//        testUser.token.add(getInstance().createToken(testUser.uId));
        return testUser;
    }

    public static PutUser setUser(String uId, String name, String pw, String iconImage) {
        Session session = sessionFactory.openSession();
        session.beginTransaction();
        List usersList = session.createQuery( "from User" ).list();
        for ( User user : (List<User>) usersList ) {
            if(user.getuId() == uId){
                user.setName(name);
                if(iconImage != null) {
                    user.setIconUri(iconImage);
                }
                session.update(user);
                break;
            }
        }
        //ここの2行でUser.javaからUriとuIdを参照
        User findUser = (User) session.load(User.class, uId);
        PutUser putUser = new PutUser(findUser.getUri(),findUser.getuId());
        session.getTransaction().commit();
        session.close();
//        testUser.token.add(getInstance().createToken(testUser.uId));
//        testUser.token.add(getInstance().createToken(testUser.uId));
        //表示するのはUriとuIdのみ
        return putUser;
    }

    public static User getUserById(String uId) {
        //与えられたuIdのUser情報を返す
        Session session = sessionFactory.openSession();
        session.beginTransaction();
        List usersList = session.createQuery( "from User" ).list();
        //uIdを比較し、一致した場合はNameとiconUriを返す。一致しない場合はbreak
        for ( User user : (List<User>) usersList ) {
            if (user.getuId() == uId) {
                User findUser = (User) session.load(User.class, uId);
                ObjectMapper mapper = new ObjectMapper();
                return mapper.addMixIn(findUser, findUser.removeuIdAnduri());
//                System.out.println( "name: " + user.getName() + "iconUri : " + user.getIconUri());]
            }else{
                break;
            }
        }
        session.getTransaction().commit();
        session.close();
//        testUser.token.add(getInstance().createToken(testUser.uId));
//        testUser.token.add(getInstance().createToken(testUser.uId));
        //一致しない場合は返す必要がないのでnull
        return null;
    }

    public static User getUserByToken(String token) {
        //与えられたTokenに紐づくUser情報を返す
        User testUser = new User("test",  getInstance().createUId(), "http://test.com", "http://localhost:8080/iconImage/b4bb7db0-cc0c-4ee1-816f-8304add12da8.jpg");
//        testUser.token.add(getInstance().createToken(testUser.uId));
//        testUser.token.add(getInstance().createToken(testUser.uId));
        return testUser;
    }

    public static DeleteResult deleteUser(String uId) {
        Session session = sessionFactory.openSession();
        session = sessionFactory.openSession();
        session.beginTransaction();
        Request deleteRequest = (Request) session.load(Request.class, uId);
        if(deleteRequest != null){
            session.delete(deleteRequest);
            System.out.println("massage: Already Deleted");
        }
        session.getTransaction().commit();
        session.close();
        return DeleteResult.SUCCESS;
    }

    public static Token login(String uId) {
        Token testtoken = getInstance().createToken(uId);
        //tokenを作成後値を返す
        return testtoken;//testToken
    }

    public static DeleteResult logout(String token) {
        if(Users.getInstance().getUserByToken(token).uId == null) {
            return DeleteResult.FAILURE;
        }else{
//            Users.getInstance().getUserByToken(token).token.remove(Users.getInstance().getUserByToken(token).token.indexOf(token));
            return DeleteResult.SUCCESS;
        }
    }

    public static boolean checkToken(String uId, String token) {
        //与えられたtokenとUserのtokenを比較し結果を返す
        return true;
    }

    public static boolean checkPassword(String uId, String pw) {
        //与えられたパスワードとUserのパスワードを比較し結果を返す
        return true;
    }
}