package com.annimon.everlastingsummer;

import java.util.Locale;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Color;
import android.graphics.drawable.ColorDrawable;
import android.graphics.drawable.Drawable;
import android.graphics.drawable.LayerDrawable;
import android.util.AttributeSet;
import android.util.SparseArray;
import android.widget.ImageView;
import com.annimon.everlastingsummer.drawables.TransitionAnimationDrawable;
import com.annimon.everlastingsummer.transitions.Dissolve;
import com.annimon.everlastingsummer.transitions.Fade;
import com.annimon.everlastingsummer.transitions.Transition;
import com.annimon.everlastingsummer.transitions.Transitions;

/**
 * ImageView с поддержкой анимации переходов.
 * @author aNNiMON
 */
public class AnimatableImageView extends ImageView {
    
    private static final ColorDrawable NONE = new ColorDrawable();
    
    private static final SparseArray<Drawable> colors;
    static {
        colors = new SparseArray<Drawable>();
        colors.append(0, NONE);
        colors.append(Color.WHITE, new ColorDrawable(Color.WHITE));
        colors.append(Color.BLACK, new ColorDrawable(Color.BLACK));
        colors.append(0xFFEE1111, new ColorDrawable(0xFFEE1111));
    }
    
    private Drawable previous;
    
    public AnimatableImageView(Context context) {
        super(context);
    }
    
    public AnimatableImageView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }
    
    public AnimatableImageView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    @Override
    public void setImageResource(int resId) {
        setImageResource(resId, "");
    }
    
    public int setImageResource(int resId, String effect) {
        previous = getDrawable();
        super.setImageResource(resId);
        return setAnimationEffect(effect);
    }

    @Override
    public void setImageDrawable(Drawable drawable) {
        setImageDrawable(drawable, "");
    }
    
    public int setImageDrawable(Drawable drawable, String effect) {
        previous = getDrawable();
        super.setImageDrawable(drawable);
        return setAnimationEffect(effect);
    }

    @Override
    public void setImageBitmap(Bitmap bm) {
        setImageBitmap(bm, "");
    }
    
    public int setImageBitmap(Bitmap bm, String effect) {
        previous = getDrawable();
        super.setImageBitmap(bm);
        return setAnimationEffect(effect);
    }
    
    @Override
    public Drawable getDrawable() {
        final Drawable result = super.getDrawable();
        if (result == null) return new ColorDrawable();
        if (result instanceof LayerDrawable) {
            final LayerDrawable ld = (LayerDrawable) result;
            return ld.getDrawable(ld.getNumberOfLayers() - 1);
        }
        return result;
    }
    
    public void hideDrawable(String effect, Runnable runnable) {
        final int delay = setImageDrawable(NONE, effect);
        if (delay == 0) runnable.run();
        else {
            postDelayed(runnable, delay);
        }
    }

    private int setAnimationEffect(String animEffect) {
        final String effect = animEffect.toLowerCase(Locale.ENGLISH);
        if (!Transitions.contains(effect)) return 0;
        
        final Transition transition = Transitions.get(effect);
        switch (transition.type()) {
            
            case Transition.TYPE_FADE: {
                final TransitionAnimationDrawable drawable = fade((Fade) transition);
                setImageDrawable(drawable);
                drawable.startTransition();
                return drawable.getFullDuration();
            }
                
            case Transition.TYPE_DISSOLVE: {
                final Dissolve dissolve = (Dissolve) transition;
                final int delay = dissolve.getDelay();
                final TransitionAnimationDrawable drawable =
                        new TransitionAnimationDrawable(delay, previous, getDrawable());
                setImageDrawable(drawable);
                drawable.setCrossFadeEnabled(true);
                drawable.startTransition();
                return drawable.getFullDuration();
            }
                
            default:
                return 0;
        }
    }
    
    private TransitionAnimationDrawable fade(Fade fade) {
        final int fadeColor = fade.getColor();
        
        // Достаём ColorDrawable из кэша или создаём новый и кладём в кэш
        Drawable fadeColorDrawable;
        if (colors.indexOfKey(fadeColor) < 0) {
            fadeColorDrawable = new ColorDrawable(fadeColor);
            colors.put(fadeColor, fadeColorDrawable);
        } else {
            fadeColorDrawable = colors.get(fadeColor);
        }
        
        final TransitionAnimationDrawable.Builder builder = new TransitionAnimationDrawable.Builder();
        builder.add(0, previous);
        // img1 -> color
        builder.add(fade.getOutTime(), fadeColorDrawable);
        if (fade.getHoldTime() > 0) {
            // color ~ color
            builder.add(fade.getHoldTime(), new ColorDrawable(fadeColor)); // копия обязательна!
        }
        // color -> img2
        builder.add(fade.getInTime(), getDrawable());
        return builder.build();
    }
}