package com.annimon.everlastingsummer;

import java.util.HashMap;
import java.util.Locale;
import java.util.Map;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.drawable.ColorDrawable;
import android.graphics.drawable.Drawable;
import android.graphics.drawable.TransitionDrawable;
import android.util.AttributeSet;
import android.widget.ImageView;

/**
 * ImageView с поддержкой анимации переходов.
 * @author aNNiMON
 */
public class AnimatableImageView extends ImageView {
    
    private static final Drawable BLACK_DRAWABLE = new ColorDrawable(0xFF000000);
    private static final Drawable WHITE_DRAWABLE = new ColorDrawable(0xFFFFFFFF);
    private static final Drawable RED_DRAWABLE = new ColorDrawable(0xFFFF0000);
    
    private static final Anim FADE = new Anim(1000, BLACK_DRAWABLE);
    private static final Anim FADE2 = new Anim(2000, BLACK_DRAWABLE);
    private static final Anim FADE3 = new Anim(3000, BLACK_DRAWABLE);
    private static final Anim DSPR = new Anim(200);
    private static final Anim DISSOLVE = new Anim(1000);
    private static final Anim DISSOLVE2 = new Anim(2000);
    private static final Anim FLASH = new Anim(1000, WHITE_DRAWABLE);
    private static final Anim FLASH2 = new Anim(2000, WHITE_DRAWABLE);
    private static final Anim FLASH_RED = new Anim(1000, RED_DRAWABLE);
    
    private static final Map<String, Anim> animations;
    static {
        animations = new HashMap<String, AnimatableImageView.Anim>();
        animations.put("fade", FADE);
        animations.put("fade2", FADE2);
        animations.put("fade3", FADE3);
        animations.put("dspr", DSPR);
        animations.put("dissolve", DISSOLVE);
        animations.put("dissolve2", DISSOLVE2);
        animations.put("flash", FLASH);
        animations.put("flash2", FLASH2);
        animations.put("flash_red", FLASH_RED);
    }
    
    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("");
    }

    @Override
    public void setImageBitmap(Bitmap bm) {
        setImageBitmap(bm, "");
    }
    
    public int setImageBitmap(Bitmap bm, String effect) {
        previous = getDrawable();
        super.setImageBitmap(bm);
        return setAnimationEffect(effect);
    }
    
    private int setAnimationEffect(String animEffect) {
        final String effect = animEffect.toLowerCase(Locale.ENGLISH);
        if (!animations.containsKey(effect)) return 0;
        
        final Anim anim = animations.get(effect);
        
        final Drawable[] layers = new Drawable[2];
        layers[0] = anim.usePreviousDrawable ? previous : anim.drawable;
        layers[1] = getDrawable();
        
        final TransitionDrawable transition = new TransitionDrawable(layers);
        setImageDrawable(transition);
        transition.startTransition(anim.duration);
        return anim.duration;
    }

    private static class Anim {
        final int duration;
        final boolean usePreviousDrawable;
        final Drawable drawable;
        
        Anim(int duration) {
            this(duration, true, null);
        }
        
        Anim(int duration, Drawable drawable) {
            this(duration, false, drawable);
        }

        Anim(int duration, boolean usePreviousDrawable, Drawable drawable) {
            this.duration = duration;
            this.usePreviousDrawable = usePreviousDrawable;
            this.drawable = drawable;
        }
    }
}