import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageButton;
import android.widget.TextView;

import org.lucasr.twowayview.TwoWayView;

import java.util.ArrayList;


public class MainActivity extends Activity {


    public static ArrayList<Uri> uris = new ArrayList<>();
    private static ContactPagerAdapter adapter;
    public static Integer ids;
    private static int focusedPage;
    private static final int SMOOTH_SCROLL = 0;
    private static final int SET_SELECT_SCROLL = 1;
    public static Boolean resultState;

    private static TwoWayView lvTest;
    private static TouchImageView photoImage;
    private static ViewPager pager;
    private TextView textView;
    private ImageButton imageButton;
    private ImageButton ibtnLeft;
    private ImageButton ibtnRight;
    private Intent cameraIntent;
    private CustomAdapter customAdapter;
    private LayoutInflater inflater;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        resultState = false;
        inflater = (LayoutInflater) getSystemService(LAYOUT_INFLATER_SERVICE);

        focusedPage = 0;
        textView = (TextView) findViewById(R.id.textView);
        lvTest = (TwoWayView) findViewById(R.id.lvItems);
        pager = (ViewPager) findViewById(R.id.pager);
        imageButton = (ImageButton) findViewById(R.id.imageButton);
        ibtnLeft = (ImageButton) findViewById(R.id.imageButtonLeft);
        ibtnRight = (ImageButton) findViewById(R.id.imageButtonRight);
        adapter = new ContactPagerAdapter();

        ibtnRight.setVisibility(View.INVISIBLE);
        ibtnLeft.setVisibility(View.INVISIBLE);
        imageButton.setVisibility(View.INVISIBLE);


        pager.setAdapter(adapter);
        cameraIntent = new Intent(this, CameraActivity.class);


        pager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {

            @Override
            public void onPageSelected(int position) {
                focusedPage = position;
                if (position == uris.size())
                    pager.setCurrentItem(0);

                setScrollTop(focusedPage, SMOOTH_SCROLL);

                if (position == uris.size() - 1) {
                    ibtnRight.setVisibility(View.INVISIBLE);
                } else {
                    ibtnRight.setVisibility(View.VISIBLE);
                }
                if (position == 0) {
                    ibtnLeft.setVisibility(View.INVISIBLE);
                } else {
                    ibtnLeft.setVisibility(View.VISIBLE);
                }
            }

            @Override
            public void onPageScrolled(int arg0, float arg1, int arg2) {
            }

            @Override
            public void onPageScrollStateChanged(int arg0) {

            }
        });
    }


    public class ContactPagerAdapter extends PagerAdapter {

        public ContactPagerAdapter() {
            super();
        }

        @Override
        public int getItemPosition(Object object) {
            return POSITION_NONE;
        }

        @Override
        public int getCount() {
            return uris.size();
        }

        @Override
        public Object instantiateItem(ViewGroup container, int position) {
            if (uris.size() != 0) {
                photoImage = new TouchImageView(getApplicationContext());
                //  photoImage.setScaleType(ImageView.ScaleType.CENTER_CROP);
                photoImage.setImageURI(uris.get(position));
                //   Picasso.with(context).load(uris.get(position)).into(photoImage);
           /*final int padding = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 16, getResources().getDisplayMetrics());
            photoImage.setPadding(padding, padding, padding, padding);*/
                container.addView(photoImage, 0);
                photoImage.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {

                    }
                });
            }
            return photoImage;
        }

        @Override
        public void destroyItem(ViewGroup container, int position, Object view) {
            container.removeView((View) view);
        }

        @Override
        public boolean isViewFromObject(View v, Object o) {
            return v == o;
        }
    }

    public static void changePhoto(int id) {
        pager.setCurrentItem(id);
        ids = id;
    }

    @Override
    public void onBackPressed() {
        AlertDialog.Builder alertDialog = new AlertDialog.Builder(MainActivity.this);
        alertDialog.setTitle("Выйти?");
        alertDialog.setPositiveButton("Да", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
                System.exit(0);
            }
        });
        alertDialog.setNegativeButton("Нет", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
                dialog.cancel();
            }
        });
        alertDialog.show();
    }

   /* public static void resizeImageView(Uri uri) {
        File picture = new File(String.valueOf(uri));
        if (picture.exists()) {
            BitmapFactory.Options options = new BitmapFactory.Options();
            options.inSampleSize = 0;
            //   Bitmap myBitmap = BitmapFactory.decodeFile(picture.getAbsolutePath(), options);
        }
    }*/

    public void onLeft(View v) {
        pager.setCurrentItem(0);
    }

    public void onRight(View v) {
        pager.setCurrentItem(uris.size() - 1);
    }

    public void setScrollTop(int pos, int scroll) {
        switch (scroll) {
            case 0:
                lvTest.smoothScrollToPosition(pos);
                break;
            case 1:
                lvTest.setSelection(pos);
                break;
        }
    }

    @Override
    public void onResume() {
        super.onResume();
        if (resultState) {
            refreshView();
        }
    }

    public void startCamera(View v) {
        setVisibility();
        startActivity(cameraIntent);
        resultState = true;
    }

    public void onClickPhotoNew(View v) {
        ids = null;
        setVisibility();
        startActivity(cameraIntent);
        resultState = true;

    }
    private void setVisibility(){
    textView.setVisibility(View.INVISIBLE);
    imageButton.setVisibility(View.VISIBLE);
}


    public void refreshView() {

        customAdapter = new CustomAdapter(this, uris, inflater);

        lvTest.setAdapter(customAdapter);

        adapter.notifyDataSetChanged();
        pager.setAdapter(adapter);
        if (ids == null) {
            pager.setCurrentItem(uris.size() - 1);
        } else {
            pager.setCurrentItem(ids);
        }
        setScrollTop(uris.size() - 1, SMOOTH_SCROLL);
        if (ids != null) {
            setScrollTop(ids, SET_SELECT_SCROLL);
        } else lvTest.setSelection(uris.size() - 1);
        ids = null;
    }


    public void deletePhoto(int id) {
        uris.remove(id);

       // uris.removeAll(Collections.singleton(null));
     /*   for (int i = id; i < uris.size()-1-id; i++) {
            if (i<i+1){
                uris.set(i,uris.get(i+1));
            }
        }*/

        refreshView();
    }
}