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 * person obtaining a copy of this software, associated documentation and/or
 * data (collectively the "Software"), free of charge and under any and all
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 * unmodified Software as contributed to or provided by such licensor, or (ii)
 * the Larger Works (as defined below), to deal in both
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 * (a) the Software, and
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 * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
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 * is contributed by such licensors),
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 * without restriction, including without limitation the rights to copy, create
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package com.oracle.truffle.js.runtime.array.dyn;

import static com.oracle.truffle.api.CompilerDirectives.FASTPATH_PROBABILITY;
import static com.oracle.truffle.api.CompilerDirectives.injectBranchProbability;
import static com.oracle.truffle.js.runtime.builtins.JSAbstractArray.arrayGetArray;
import static com.oracle.truffle.js.runtime.builtins.JSAbstractArray.arraySetArray;

import java.util.Objects;

import com.oracle.truffle.api.CompilerDirectives;
import com.oracle.truffle.api.object.DynamicObject;
import com.oracle.truffle.js.runtime.JSConfig;
import com.oracle.truffle.js.runtime.array.ScriptArray;

public abstract class AbstractObjectArray extends AbstractWritableArray {

    protected AbstractObjectArray(int integrityLevel, DynamicArrayCache cache) {
        super(integrityLevel, cache);
    }

    @Override
    AbstractWritableArray sameTypeHolesArray(DynamicObject object, int length, Object array, long indexOffset, int arrayOffset, int usedLength, int holeCount) {
        return HolesObjectArray.makeHolesObjectArray(object, length, (Object[]) array, indexOffset, arrayOffset, usedLength, holeCount, integrityLevel);
    }

    public abstract void setInBoundsFast(DynamicObject object, int index, Object value);

    @Override
    public final ScriptArray setElementImpl(DynamicObject object, long index, Object value, boolean strict) {
        assert index >= 0;
        if (injectBranchProbability(FASTPATH_PROBABILITY, isSupported(object, index))) {
            assert value != null;
            setSupported(object, (int) index, value);
            return this;
        } else {
            return rewrite(object, index, value).setElementImpl(object, index, value, strict);
        }
    }

    private ScriptArray rewrite(DynamicObject object, long index, Object value) {
        if (isSupportedContiguous(object, index)) {
            return toContiguous(object, index, value);
        } else if (isSupportedHoles(object, index)) {
            return toHoles(object, index, value);
        } else {
            return toSparse(object, index, value);
        }
    }

    @Override
    public Object getInBoundsFast(DynamicObject object, int index) {
        return getInBoundsFastObject(object, index);
    }

    @Override
    int getArrayLength(Object array) {
        return ((Object[]) array).length;
    }

    protected static Object[] getArray(DynamicObject object) {
        Object array = arrayGetArray(object);
        if (array.getClass() == Object[].class) {
            return CompilerDirectives.castExact(array, Object[].class);
        } else {
            throw CompilerDirectives.shouldNotReachHere();
        }
    }

    public abstract Object getInBoundsFastObject(DynamicObject object, int index);

    public final void setInBounds(DynamicObject object, int index, Object value, ProfileHolder profile) {
        getArray(object)[prepareInBounds(object, index, profile)] = checkNonNull(value);
        if (JSConfig.TraceArrayWrites) {
            traceWriteValue("InBounds", index, value);
        }
    }

    public final void setSupported(DynamicObject object, int index, Object value) {
        int preparedIndex = prepareSupported(object, index, ProfileHolder.empty());

        getArray(object)[preparedIndex] = checkNonNull(value);
        if (JSConfig.TraceArrayWrites) {
            traceWriteValue("Supported", index, value);
        }
    }

    @Override
    void fillWithHoles(Object array, int fromIndex, int toIndex) {
        Object[] objectArray = (Object[]) array;
        for (int i = fromIndex; i < toIndex; i++) {
            objectArray[i] = null;
        }
    }

    @Override
    protected final void setHoleValue(DynamicObject object, int preparedIndex) {
        getArray(object)[preparedIndex] = null;
    }

    @Override
    protected final void fillHoles(DynamicObject object, int internalIndex, int grown, ProfileHolder profile) {
        if (grown != 0) {
            incrementHolesCount(object, Math.abs(grown) - 1);
        }
    }

    @Override
    protected final boolean isHolePrepared(DynamicObject object, int preparedIndex) {
        return HolesObjectArray.isHoleValue(getArray(object)[preparedIndex]);
    }

    @Override
    protected final int getArrayCapacity(DynamicObject object) {
        return getArray(object).length;
    }

    @Override
    protected final void resizeArray(DynamicObject object, int newCapacity, int oldCapacity, int offset) {
        Object[] newArray = new Object[newCapacity];
        System.arraycopy(getArray(object), 0, newArray, offset, oldCapacity);
        arraySetArray(object, newArray);
    }

    @Override
    public abstract AbstractObjectArray toHoles(DynamicObject object, long index, Object value);

    @Override
    public final AbstractWritableArray toDouble(DynamicObject object, long index, double value) {
        return this;
    }

    @Override
    public final AbstractWritableArray toObject(DynamicObject object, long index, Object value) {
        return this;
    }

    @Override
    public ScriptArray deleteElementImpl(DynamicObject object, long index, boolean strict) {
        return toHoles(object, index, null).deleteElementImpl(object, index, strict);
    }

    @Override
    protected final void moveRangePrepared(DynamicObject object, int src, int dst, int len) {
        Object[] array = getArray(object);
        System.arraycopy(array, src, array, dst, len);
    }

    @Override
    public final Object allocateArray(int length) {
        return new Object[length];
    }

    @Override
    public Object cloneArray(DynamicObject object) {
        return getArray(object).clone();
    }

    @Override
    protected abstract AbstractObjectArray withIntegrityLevel(int newIntegrityLevel);

    protected static Object checkNonNull(Object value) {
        assert value != null;
        return value;
    }

    protected Object castNonNull(Object value) {
        if (JSConfig.MarkElementsNonNull) {
            return Objects.requireNonNull(value);
        } else {
            return value;
        }
    }
}