/*

 * Copyright (c) 2011, 2012, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package apple.laf;

import apple.laf.JRSUIConstants.*;

@SuppressWarnings("unchecked")

public class JRSUIState {

//    static HashSet<JRSUIState> states = new HashSet<JRSUIState>();

    final long encodedState;

    long derivedEncodedState;

    static JRSUIState prototype = new JRSUIState(0);

    public static JRSUIState getInstance() {

        return prototype.derive();

    }

    JRSUIState(final Widget widget) {

        this(widget.apply(0));

    }

    JRSUIState(final long encodedState) {

        this.encodedState = derivedEncodedState = encodedState;

    }

    boolean isDerivationSame() {

        return encodedState == derivedEncodedState;

    }

    public <T extends JRSUIState> T derive() {

        if (isDerivationSame()) return (T)this;

        final T derivation = (T)createDerivation();

//        if (!states.add(derivation)) {

//            System.out.println("dupe: " + states.size());

//        }

        return derivation;

    }

    public <T extends JRSUIState> T createDerivation() {

        return (T)new JRSUIState(derivedEncodedState);

    }

    public void reset() {

        derivedEncodedState = encodedState;

    }

    public void set(final Property property) {

        derivedEncodedState = property.apply(derivedEncodedState);

    }

    public void apply(final JRSUIControl control) {

        control.setEncodedState(encodedState);

    }

    @Override

    public boolean equals(final Object obj) {

        if (!(obj instanceof JRSUIState)) return false;

        return encodedState == ((JRSUIState)obj).encodedState && getClass().equals(obj.getClass());

    }

    public boolean is(Property property) {

        return (byte)((derivedEncodedState & property.encoding.mask) >> property.encoding.shift) == property.ordinal;

    }

    @Override

    public int hashCode() {

        return (int)(encodedState ^ (encodedState >>> 32)) ^ getClass().hashCode();

    }

    public static class AnimationFrameState extends JRSUIState {

        final int animationFrame;

        int derivedAnimationFrame;

        AnimationFrameState(final long encodedState, final int animationFrame) {

            super(encodedState);

            this.animationFrame = derivedAnimationFrame = animationFrame;

        }

        @Override

        boolean isDerivationSame() {

            return super.isDerivationSame() && (animationFrame == derivedAnimationFrame);

        }

        @Override

        public <T extends JRSUIState> T createDerivation() {

            return (T)new AnimationFrameState(derivedEncodedState, derivedAnimationFrame);

        }

        @Override

        public void reset() {

            super.reset();

            derivedAnimationFrame = animationFrame;

        }

        public void setAnimationFrame(final int frame) {

            this.derivedAnimationFrame = frame;

        }

        @Override

        public void apply(final JRSUIControl control) {

            super.apply(control);

            control.set(Key.ANIMATION_FRAME, animationFrame);

        }

        @Override

        public boolean equals(final Object obj) {

            if (!(obj instanceof AnimationFrameState)) return false;

            return animationFrame == ((AnimationFrameState)obj).animationFrame && super.equals(obj);

        }

        @Override

        public int hashCode() {

            return super.hashCode() ^ animationFrame;

        }

    }

    public static class ValueState extends JRSUIState {

        final double value;

        double derivedValue;

        ValueState(final long encodedState, final double value) {

            super(encodedState);

            this.value = derivedValue = value;

        }

        @Override

        boolean isDerivationSame() {

            return super.isDerivationSame() && (value == derivedValue);

        }

        @Override

        public <T extends JRSUIState> T createDerivation() {

            return (T)new ValueState(derivedEncodedState, derivedValue);

        }

        @Override

        public void reset() {

            super.reset();

            derivedValue = value;

        }

        public void setValue(final double value) {

            derivedValue = value;

        }

        @Override

        public void apply(final JRSUIControl control) {

            super.apply(control);

            control.set(Key.VALUE, value);

        }

        @Override

        public boolean equals(final Object obj) {

            if (!(obj instanceof ValueState)) return false;

            return value == ((ValueState)obj).value && super.equals(obj);

        }

        @Override

        public int hashCode() {

            final long bits = Double.doubleToRawLongBits(value);

            return super.hashCode() ^ (int)bits ^ (int)(bits >>> 32);

        }

    }

    public static class TitleBarHeightState extends ValueState {

        TitleBarHeightState(final long encodedState, final double value) {

            super(encodedState, value);

        }

        @Override

        public <T extends JRSUIState> T createDerivation() {

            return (T)new TitleBarHeightState(derivedEncodedState, derivedValue);

        }

        @Override

        public void apply(final JRSUIControl control) {

            super.apply(control);

            control.set(Key.WINDOW_TITLE_BAR_HEIGHT, value);

        }

    }

    public static class ScrollBarState extends ValueState {

        final double thumbProportion;

        double derivedThumbProportion;

        final double thumbStart;

        double derivedThumbStart;

        ScrollBarState(final long encodedState, final double value, final double thumbProportion, final double thumbStart) {

            super(encodedState, value);

            this.thumbProportion = derivedThumbProportion = thumbProportion;

            this.thumbStart = derivedThumbStart = thumbStart;

        }

        @Override

        boolean isDerivationSame() {

            return super.isDerivationSame() && (thumbProportion == derivedThumbProportion) && (thumbStart == derivedThumbStart);

        }

        @Override

        public <T extends JRSUIState> T createDerivation() {

            return (T)new ScrollBarState(derivedEncodedState, derivedValue, derivedThumbProportion, derivedThumbStart);

        }

        @Override

        public void reset() {

            super.reset();

            derivedThumbProportion = thumbProportion;

            derivedThumbStart = thumbStart;

        }

        public void setThumbPercent(final double thumbPercent) {

            derivedThumbProportion = thumbPercent;

        }

        public void setThumbStart(final double thumbStart) {

            derivedThumbStart = thumbStart;

        }

        @Override

        public void apply(final JRSUIControl control) {

            super.apply(control);

            control.set(Key.THUMB_PROPORTION, thumbProportion);

            control.set(Key.THUMB_START, thumbStart);

        }

        @Override

        public boolean equals(final Object obj) {

            if (!(obj instanceof ScrollBarState)) return false;

            return (thumbProportion == ((ScrollBarState)obj).thumbProportion) && (thumbStart == ((ScrollBarState)obj).thumbStart) && super.equals(obj);

        }

        @Override

        public int hashCode() {

            final long bits = Double.doubleToRawLongBits(thumbProportion) ^ Double.doubleToRawLongBits(thumbStart);

            return super.hashCode() ^ (int)bits ^ (int)(bits >>> 32);

        }

    }

}