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package com.example.login;

import android.content.Intent;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;

public class MainActivity extends ActionBarActivity {

String DATABASE_NAME="login.sqlite";
    String DATABASE_PATH="/databases/";
    SQLiteDatabase database=null;

//lấy đường dẫn cho database
    private String path_data(){
        return getApplicationInfo().dataDir + DATABASE_PATH + DATABASE_NAME;
    }

//hàm kết nối với database
    private void connectData(){
        File dbfile=getDatabasePath(DATABASE_NAME);
        if(!dbfile.exists()){
            try{
                CopyDatafromassets();
                Toast.makeText(this,"Sao chép CSDL vào hệ thống thành công!",Toast.LENGTH_LONG).show();
            }catch (Exception e){
                Toast.makeText(this, e.toString(),Toast.LENGTH_LONG).show();
            }
        }
    }

//hàm sao chép dữ liệu từ assets đến database của phần mềm
    private void CopyDatafromassets() {
        try{
            InputStream myinput=getAssets().open(DATABASE_NAME);
            String outfilename= path_data();
            File f=new File(getApplicationInfo().dataDir + DATABASE_PATH);
            if(!f.exists()){
                f.mkdir();
            }
            OutputStream myoutput=new FileOutputStream(outfilename);
            byte[] buffer= new byte[1024];
            int length;
            while((length=myinput.read(buffer))>0){
                myoutput.write(buffer,0,length);
            }
            myoutput.flush();
            myoutput.close();
            myinput.close();
        }catch (Exception e){
            Log.e("Lỗi sao chép", e.toString());
        }
    }

int i=0;
    TextView username;
    TextView password;
    Button login;
    Button registration;

@Override

// tạo thuộc tính
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        connectData(); // kết nối dữ liệu
        connectView(); // ánh xạ
        clickbtnlogin(); // đăng nhập
        clickbtnRegistration(); // đăng ký

}

private void clickbtnRegistration() {
        registration.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(MainActivity.this, Registration.class);
                startActivity(intent);
            }
        });

}

private void kiemtrataikhoan(String tentaikhoan, String pass) {
        database=openOrCreateDatabase(DATABASE_NAME,MODE_PRIVATE,null);
        Cursor cursor =database.rawQuery("SELECT * FROM taikhoan WHERE tentaikhoan=? AND matkhau=?",new String[]{tentaikhoan,pass});
        while (cursor.moveToNext()){
            i=cursor.getInt(0);
        }
        cursor.close();
    }

private void clickbtnlogin() {

login.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                i=0;
                kiemtrataikhoan(username.getText().toString(),password.getText().toString());
                if(i==0){
                    Toast.makeText(MainActivity.this,"Tài khoản không đúng",Toast.LENGTH_LONG).show();
                }
                else if(i==1){
                    Intent intent= new Intent(MainActivity.this,Admin.class);
                    startActivity(intent);
                }
                else{
                    Intent intent= new Intent(MainActivity.this,Thongtin.class);
                    intent.putExtra("idlogin",i);
                    startActivity(intent);
                }
            }
        });
    }

private void connectView() {
        username = (TextView) findViewById(R.id.username);
        password = (TextView) findViewById(R.id.password);
        login = (Button) findViewById(R.id.btn_login);
        registration = (Button) findViewById(R.id.btn_registration);

}

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