/*
 * Copyright (C) 2013 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package android.transition;

import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.animation.AnimatorSet;
import android.animation.ObjectAnimator;
import android.animation.PropertyValuesHolder;
import android.animation.RectEvaluator;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Path;
import android.graphics.PointF;
import android.graphics.Rect;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.util.Property;
import android.view.View;
import android.view.ViewGroup;

import com.android.internal.R;

import java.util.Map;

This transition captures the layout bounds of target views before and after
the scene change and animates those changes during the transition.
A ChangeBounds transition can be described in a resource file by using the
tag changeBounds, using its attributes of ChangeBounds.ChangeBounds along with the other standard attributes of Transition.Transition.
/**
 * This transition captures the layout bounds of target views before and after
 * the scene change and animates those changes during the transition.
 *
 * <p>A ChangeBounds transition can be described in a resource file by using the
 * tag <code>changeBounds</code>, using its attributes of
 * {@link android.R.styleable#ChangeBounds} along with the other standard
 * attributes of {@link android.R.styleable#Transition}.</p>
 */
public class ChangeBounds extends Transition {

    private static final String PROPNAME_BOUNDS = "android:changeBounds:bounds";
    private static final String PROPNAME_CLIP = "android:changeBounds:clip";
    private static final String PROPNAME_PARENT = "android:changeBounds:parent";
    private static final String PROPNAME_WINDOW_X = "android:changeBounds:windowX";
    private static final String PROPNAME_WINDOW_Y = "android:changeBounds:windowY";
    private static final String[] sTransitionProperties = {
            PROPNAME_BOUNDS,
            PROPNAME_CLIP,
            PROPNAME_PARENT,
            PROPNAME_WINDOW_X,
            PROPNAME_WINDOW_Y
    };

    private static final Property<Drawable, PointF> DRAWABLE_ORIGIN_PROPERTY =
            new Property<Drawable, PointF>(PointF.class, "boundsOrigin") {
                private Rect mBounds = new Rect();

                @Override
                public void set(Drawable object, PointF value) {
                    object.copyBounds(mBounds);
                    mBounds.offsetTo(Math.round(value.x), Math.round(value.y));
                    object.setBounds(mBounds);
                }

                @Override
                public PointF get(Drawable object) {
                    object.copyBounds(mBounds);
                    return new PointF(mBounds.left, mBounds.top);
                }
    };

    private static final Property<ViewBounds, PointF> TOP_LEFT_PROPERTY =
            new Property<ViewBounds, PointF>(PointF.class, "topLeft") {
                @Override
                public void set(ViewBounds viewBounds, PointF topLeft) {
                    viewBounds.setTopLeft(topLeft);
                }

                @Override
                public PointF get(ViewBounds viewBounds) {
                    return null;
                }
            };

    private static final Property<ViewBounds, PointF> BOTTOM_RIGHT_PROPERTY =
            new Property<ViewBounds, PointF>(PointF.class, "bottomRight") {
                @Override
                public void set(ViewBounds viewBounds, PointF bottomRight) {
                    viewBounds.setBottomRight(bottomRight);
                }

                @Override
                public PointF get(ViewBounds viewBounds) {
                    return null;
                }
            };

    private static final Property<View, PointF> BOTTOM_RIGHT_ONLY_PROPERTY =
            new Property<View, PointF>(PointF.class, "bottomRight") {
                @Override
                public void set(View view, PointF bottomRight) {
                    int left = view.getLeft();
                    int top = view.getTop();
                    int right = Math.round(bottomRight.x);
                    int bottom = Math.round(bottomRight.y);
                    view.setLeftTopRightBottom(left, top, right, bottom);
                }

                @Override
                public PointF get(View view) {
                    return null;
                }
            };

    private static final Property<View, PointF> TOP_LEFT_ONLY_PROPERTY =
            new Property<View, PointF>(PointF.class, "topLeft") {
                @Override
                public void set(View view, PointF topLeft) {
                    int left = Math.round(topLeft.x);
                    int top = Math.round(topLeft.y);
                    int right = view.getRight();
                    int bottom = view.getBottom();
                    view.setLeftTopRightBottom(left, top, right, bottom);
                }

                @Override
                public PointF get(View view) {
                    return null;
                }
            };

    private static final Property<View, PointF> POSITION_PROPERTY =
            new Property<View, PointF>(PointF.class, "position") {
                @Override
                public void set(View view, PointF topLeft) {
                    int left = Math.round(topLeft.x);
                    int top = Math.round(topLeft.y);
                    int right = left + view.getWidth();
                    int bottom = top + view.getHeight();
                    view.setLeftTopRightBottom(left, top, right, bottom);
                }

                @Override
                public PointF get(View view) {
                    return null;
                }
            };

    int[] tempLocation = new int[2];
    boolean mResizeClip = false;
    boolean mReparent = false;
    private static final String LOG_TAG = "ChangeBounds";

    private static RectEvaluator sRectEvaluator = new RectEvaluator();

    public ChangeBounds() {}

    public ChangeBounds(Context context, AttributeSet attrs) {
        super(context, attrs);

        TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.ChangeBounds);
        boolean resizeClip = a.getBoolean(R.styleable.ChangeBounds_resizeClip, false);
        a.recycle();
        setResizeClip(resizeClip);
    }

    @Override
    public String[] getTransitionProperties() {
        return sTransitionProperties;
    }

    
When resizeClip is true, ChangeBounds resizes the view using the clipBounds
instead of changing the dimensions of the view during the animation. When
resizeClip is false, ChangeBounds resizes the View by changing its dimensions.
When resizeClip is set to true, the clip bounds is modified by ChangeBounds. Therefore, ChangeClipBounds is not compatible with ChangeBounds in this mode.
Params:
resizeClip – Used to indicate whether the view bounds should be modified or the
                  clip bounds should be modified by ChangeBounds.
See Also:
View.setClipBounds(Rect)
@attr
ref android.R.styleable#ChangeBounds_resizeClip/**
     * When <code>resizeClip</code> is true, ChangeBounds resizes the view using the clipBounds
     * instead of changing the dimensions of the view during the animation. When
     * <code>resizeClip</code> is false, ChangeBounds resizes the View by changing its dimensions.
     *
     * <p>When resizeClip is set to true, the clip bounds is modified by ChangeBounds. Therefore,
     * {@link android.transition.ChangeClipBounds} is not compatible with ChangeBounds
     * in this mode.</p>
     *
     * @param resizeClip Used to indicate whether the view bounds should be modified or the
     *                   clip bounds should be modified by ChangeBounds.
     * @see android.view.View#setClipBounds(android.graphics.Rect)
     * @attr ref android.R.styleable#ChangeBounds_resizeClip
     */
    public void setResizeClip(boolean resizeClip) {
        mResizeClip = resizeClip;
    }

    
Returns true when the ChangeBounds will resize by changing the clip bounds during the
view animation or false when bounds are changed. The default value is false.
Returns:
true when the ChangeBounds will resize by changing the clip bounds during the
view animation or false when bounds are changed. The default value is false.
@attr
ref android.R.styleable#ChangeBounds_resizeClip/**
     * Returns true when the ChangeBounds will resize by changing the clip bounds during the
     * view animation or false when bounds are changed. The default value is false.
     *
     * @return true when the ChangeBounds will resize by changing the clip bounds during the
     * view animation or false when bounds are changed. The default value is false.
     * @attr ref android.R.styleable#ChangeBounds_resizeClip
     */
    public boolean getResizeClip() {
        return mResizeClip;
    }

    
Setting this flag tells ChangeBounds to track the before/after parent
of every view using this transition. The flag is not enabled by
default because it requires the parent instances to be the same
in the two scenes or else all parents must use ids to allow
the transition to determine which parents are the same.
Params:
reparent – true if the transition should track the parent
container of target views and animate parent changes.
Deprecated:
Use ChangeTransform to handle transitions between different parents./**
     * Setting this flag tells ChangeBounds to track the before/after parent
     * of every view using this transition. The flag is not enabled by
     * default because it requires the parent instances to be the same
     * in the two scenes or else all parents must use ids to allow
     * the transition to determine which parents are the same.
     *
     * @param reparent true if the transition should track the parent
     * container of target views and animate parent changes.
     * @deprecated Use {@link android.transition.ChangeTransform} to handle
     * transitions between different parents.
     */
    @Deprecated
    public void setReparent(boolean reparent) {
        mReparent = reparent;
    }

    private void captureValues(TransitionValues values) {
        View view = values.view;

        if (view.isLaidOut() || view.getWidth() != 0 || view.getHeight() != 0) {
            values.values.put(PROPNAME_BOUNDS, new Rect(view.getLeft(), view.getTop(),
                    view.getRight(), view.getBottom()));
            values.values.put(PROPNAME_PARENT, values.view.getParent());
            if (mReparent) {
                values.view.getLocationInWindow(tempLocation);
                values.values.put(PROPNAME_WINDOW_X, tempLocation[0]);
                values.values.put(PROPNAME_WINDOW_Y, tempLocation[1]);
            }
            if (mResizeClip) {
                values.values.put(PROPNAME_CLIP, view.getClipBounds());
            }
        }
    }

    @Override
    public void captureStartValues(TransitionValues transitionValues) {
        captureValues(transitionValues);
    }

    @Override
    public void captureEndValues(TransitionValues transitionValues) {
        captureValues(transitionValues);
    }

    private boolean parentMatches(View startParent, View endParent) {
        boolean parentMatches = true;
        if (mReparent) {
            TransitionValues endValues = getMatchedTransitionValues(startParent, true);
            if (endValues == null) {
                parentMatches = startParent == endParent;
            } else {
                parentMatches = endParent == endValues.view;
            }
        }
        return parentMatches;
    }

    @Override
    public Animator createAnimator(final ViewGroup sceneRoot, TransitionValues startValues,
            TransitionValues endValues) {
        if (startValues == null || endValues == null) {
            return null;
        }
        Map<String, Object> startParentVals = startValues.values;
        Map<String, Object> endParentVals = endValues.values;
        ViewGroup startParent = (ViewGroup) startParentVals.get(PROPNAME_PARENT);
        ViewGroup endParent = (ViewGroup) endParentVals.get(PROPNAME_PARENT);
        if (startParent == null || endParent == null) {
            return null;
        }
        final View view = endValues.view;
        if (parentMatches(startParent, endParent)) {
            Rect startBounds = (Rect) startValues.values.get(PROPNAME_BOUNDS);
            Rect endBounds = (Rect) endValues.values.get(PROPNAME_BOUNDS);
            final int startLeft = startBounds.left;
            final int endLeft = endBounds.left;
            final int startTop = startBounds.top;
            final int endTop = endBounds.top;
            final int startRight = startBounds.right;
            final int endRight = endBounds.right;
            final int startBottom = startBounds.bottom;
            final int endBottom = endBounds.bottom;
            final int startWidth = startRight - startLeft;
            final int startHeight = startBottom - startTop;
            final int endWidth = endRight - endLeft;
            final int endHeight = endBottom - endTop;
            Rect startClip = (Rect) startValues.values.get(PROPNAME_CLIP);
            Rect endClip = (Rect) endValues.values.get(PROPNAME_CLIP);
            int numChanges = 0;
            if ((startWidth != 0 && startHeight != 0) || (endWidth != 0 && endHeight != 0)) {
                if (startLeft != endLeft || startTop != endTop) ++numChanges;
                if (startRight != endRight || startBottom != endBottom) ++numChanges;
            }
            if ((startClip != null && !startClip.equals(endClip)) ||
                    (startClip == null && endClip != null)) {
                ++numChanges;
            }
            if (numChanges > 0) {
                if (view.getParent() instanceof ViewGroup) {
                    final ViewGroup parent = (ViewGroup) view.getParent();
                    parent.suppressLayout(true);
                    TransitionListener transitionListener = new TransitionListenerAdapter() {
                        boolean mCanceled = false;

                        @Override
                        public void onTransitionCancel(Transition transition) {
                            parent.suppressLayout(false);
                            mCanceled = true;
                        }

                        @Override
                        public void onTransitionEnd(Transition transition) {
                            if (!mCanceled) {
                                parent.suppressLayout(false);
                            }
                            transition.removeListener(this);
                        }

                        @Override
                        public void onTransitionPause(Transition transition) {
                            parent.suppressLayout(false);
                        }

                        @Override
                        public void onTransitionResume(Transition transition) {
                            parent.suppressLayout(true);
                        }
                    };
                    addListener(transitionListener);
                }
                Animator anim;
                if (!mResizeClip) {
                    view.setLeftTopRightBottom(startLeft, startTop, startRight, startBottom);
                    if (numChanges == 2) {
                        if (startWidth == endWidth && startHeight == endHeight) {
                            Path topLeftPath = getPathMotion().getPath(startLeft, startTop, endLeft,
                                    endTop);
                            anim = ObjectAnimator.ofObject(view, POSITION_PROPERTY, null,
                                    topLeftPath);
                        } else {
                            final ViewBounds viewBounds = new ViewBounds(view);
                            Path topLeftPath = getPathMotion().getPath(startLeft, startTop,
                                    endLeft, endTop);
                            ObjectAnimator topLeftAnimator = ObjectAnimator
                                    .ofObject(viewBounds, TOP_LEFT_PROPERTY, null, topLeftPath);

                            Path bottomRightPath = getPathMotion().getPath(startRight, startBottom,
                                    endRight, endBottom);
                            ObjectAnimator bottomRightAnimator = ObjectAnimator.ofObject(viewBounds,
                                    BOTTOM_RIGHT_PROPERTY, null, bottomRightPath);
                            AnimatorSet set = new AnimatorSet();
                            set.playTogether(topLeftAnimator, bottomRightAnimator);
                            anim = set;
                            set.addListener(new AnimatorListenerAdapter() {
                                // We need a strong reference to viewBounds until the
                                // animator ends.
                                private ViewBounds mViewBounds = viewBounds;
                            });
                        }
                    } else if (startLeft != endLeft || startTop != endTop) {
                        Path topLeftPath = getPathMotion().getPath(startLeft, startTop,
                                endLeft, endTop);
                        anim = ObjectAnimator.ofObject(view, TOP_LEFT_ONLY_PROPERTY, null,
                                topLeftPath);
                    } else {
                        Path bottomRight = getPathMotion().getPath(startRight, startBottom,
                                endRight, endBottom);
                        anim = ObjectAnimator.ofObject(view, BOTTOM_RIGHT_ONLY_PROPERTY, null,
                                bottomRight);
                    }
                } else {
                    int maxWidth = Math.max(startWidth, endWidth);
                    int maxHeight = Math.max(startHeight, endHeight);

                    view.setLeftTopRightBottom(startLeft, startTop, startLeft + maxWidth,
                            startTop + maxHeight);

                    ObjectAnimator positionAnimator = null;
                    if (startLeft != endLeft || startTop != endTop) {
                        Path topLeftPath = getPathMotion().getPath(startLeft, startTop, endLeft,
                                endTop);
                        positionAnimator = ObjectAnimator.ofObject(view, POSITION_PROPERTY, null,
                                topLeftPath);
                    }
                    final Rect finalClip = endClip;
                    if (startClip == null) {
                        startClip = new Rect(0, 0, startWidth, startHeight);
                    }
                    if (endClip == null) {
                        endClip = new Rect(0, 0, endWidth, endHeight);
                    }
                    ObjectAnimator clipAnimator = null;
                    if (!startClip.equals(endClip)) {
                        view.setClipBounds(startClip);
                        clipAnimator = ObjectAnimator.ofObject(view, "clipBounds", sRectEvaluator,
                                startClip, endClip);
                        clipAnimator.addListener(new AnimatorListenerAdapter() {
                            private boolean mIsCanceled;

                            @Override
                            public void onAnimationCancel(Animator animation) {
                                mIsCanceled = true;
                            }

                            @Override
                            public void onAnimationEnd(Animator animation) {
                                if (!mIsCanceled) {
                                    view.setClipBounds(finalClip);
                                    view.setLeftTopRightBottom(endLeft, endTop, endRight,
                                            endBottom);
                                }
                            }
                        });
                    }
                    anim = TransitionUtils.mergeAnimators(positionAnimator,
                            clipAnimator);
                }
                return anim;
            }
        } else {
            sceneRoot.getLocationInWindow(tempLocation);
            int startX = (Integer) startValues.values.get(PROPNAME_WINDOW_X) - tempLocation[0];
            int startY = (Integer) startValues.values.get(PROPNAME_WINDOW_Y) - tempLocation[1];
            int endX = (Integer) endValues.values.get(PROPNAME_WINDOW_X) - tempLocation[0];
            int endY = (Integer) endValues.values.get(PROPNAME_WINDOW_Y) - tempLocation[1];
            // TODO: also handle size changes: check bounds and animate size changes
            if (startX != endX || startY != endY) {
                final int width = view.getWidth();
                final int height = view.getHeight();
                Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
                Canvas canvas = new Canvas(bitmap);
                view.draw(canvas);
                final BitmapDrawable drawable = new BitmapDrawable(bitmap);
                drawable.setBounds(startX, startY, startX + width, startY + height);
                final float transitionAlpha = view.getTransitionAlpha();
                view.setTransitionAlpha(0);
                sceneRoot.getOverlay().add(drawable);
                Path topLeftPath = getPathMotion().getPath(startX, startY, endX, endY);
                PropertyValuesHolder origin = PropertyValuesHolder.ofObject(
                        DRAWABLE_ORIGIN_PROPERTY, null, topLeftPath);
                ObjectAnimator anim = ObjectAnimator.ofPropertyValuesHolder(drawable, origin);
                anim.addListener(new AnimatorListenerAdapter() {
                    @Override
                    public void onAnimationEnd(Animator animation) {
                        sceneRoot.getOverlay().remove(drawable);
                        view.setTransitionAlpha(transitionAlpha);
                    }
                });
                return anim;
            }
        }
        return null;
    }

    private static class ViewBounds {
        private int mLeft;
        private int mTop;
        private int mRight;
        private int mBottom;
        private View mView;
        private int mTopLeftCalls;
        private int mBottomRightCalls;

        public ViewBounds(View view) {
            mView = view;
        }

        public void setTopLeft(PointF topLeft) {
            mLeft = Math.round(topLeft.x);
            mTop = Math.round(topLeft.y);
            mTopLeftCalls++;
            if (mTopLeftCalls == mBottomRightCalls) {
                setLeftTopRightBottom();
            }
        }

        public void setBottomRight(PointF bottomRight) {
            mRight = Math.round(bottomRight.x);
            mBottom = Math.round(bottomRight.y);
            mBottomRightCalls++;
            if (mTopLeftCalls == mBottomRightCalls) {
                setLeftTopRightBottom();
            }
        }

        private void setLeftTopRightBottom() {
            mView.setLeftTopRightBottom(mLeft, mTop, mRight, mBottom);
            mTopLeftCalls = 0;
            mBottomRightCalls = 0;
        }
    }
}