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package com.thuytrinh.cardselectordemo;

import android.os.Bundle;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.app.Activity;

public class MainActivity extends Activity implements OnPageChangeListener {

    private ViewPager mCardsViewPager;
    private float MIN_SCALE = 1f - 1f / 7f;
    private float MAX_SCALE = 1f;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mCardsViewPager = (ViewPager) findViewById(R.id.viewpager_cards);
        mCardsViewPager.setAdapter(new CardsPagerAdapter());
        mCardsViewPager.setPageMargin(-156);
        mCardsViewPager.setOffscreenPageLimit(3);
        mCardsViewPager.setOnPageChangeListener(this);
    }

    private class CardsPagerAdapter extends PagerAdapter {

        private boolean mIsDefaultItemSelected = false;

        private int[] mCards = {
                R.drawable.chrysanthemum,
                R.drawable.desert,
                R.drawable.hydrangeas,
                R.drawable.jellyfish,
                R.drawable.koala,
                R.drawable.lighthouse,
                R.drawable.penguins,
                R.drawable.tulips };

        @Override
        public Object instantiateItem(ViewGroup container, int position) {
            ImageView cardImageView = (ImageView) View.inflate(container.getContext(), R.layout.imageview_card, null);
            cardImageView.setImageDrawable(getResources().getDrawable(mCards[position]));
            cardImageView.setTag(position);

            if (!mIsDefaultItemSelected) {
                cardImageView.setScaleX(MAX_SCALE);
                cardImageView.setScaleY(MAX_SCALE);
                mIsDefaultItemSelected = true;
            } else {
                cardImageView.setScaleX(MIN_SCALE);
                cardImageView.setScaleY(MIN_SCALE);
            }

            container.addView(cardImageView);
            return cardImageView;
        }

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

        @Override
        public int getCount() {
            return mCards.length;
        }

        @Override
        public boolean isViewFromObject(View view, Object object) {
            return view == object;
        }
    }

    @Override
    public void onPageScrollStateChanged(int state) {

    }

    @Override
    public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
        for (int i = 0; i < mCardsViewPager.getChildCount(); i++) {
            View cardView = mCardsViewPager.getChildAt(i);
            int itemPosition = (Integer) cardView.getTag();

            if (itemPosition == position) {
                cardView.setScaleX(MAX_SCALE - positionOffset / 7f);
                cardView.setScaleY(MAX_SCALE - positionOffset / 7f);
            }

            if (itemPosition == (position + 1)) {
                cardView.setScaleX(MIN_SCALE + positionOffset / 7f);
                cardView.setScaleY(MIN_SCALE + positionOffset / 7f);
            }
        }
    }

    @Override
    public void onPageSelected(int position) {

    }
}