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package com.oracle.truffle.js.runtime.array.dyn;

import static com.oracle.truffle.js.runtime.builtins.JSAbstractArray.arrayGetArray;
import static com.oracle.truffle.js.runtime.builtins.JSAbstractArray.arrayGetLength;
import static com.oracle.truffle.js.runtime.builtins.JSAbstractArray.arrayGetRegexResult;
import static com.oracle.truffle.js.runtime.builtins.JSAbstractArray.arrayGetRegexResultOriginalInput;

import com.oracle.truffle.api.object.DynamicObject;
import com.oracle.truffle.api.object.DynamicObjectLibrary;
import com.oracle.truffle.js.runtime.JSConfig;
import com.oracle.truffle.js.runtime.array.DynamicArray;
import com.oracle.truffle.js.runtime.array.ScriptArray;
import com.oracle.truffle.js.runtime.objects.JSDynamicObject;
import com.oracle.truffle.js.runtime.util.TRegexUtil;

public final class LazyRegexResultArray extends AbstractConstantArray {

    public static final LazyRegexResultArray LAZY_REGEX_RESULT_ARRAY = new LazyRegexResultArray(INTEGRITY_LEVEL_NONE, createCache());

    public static LazyRegexResultArray createLazyRegexResultArray() {
        return LAZY_REGEX_RESULT_ARRAY;
    }

    private LazyRegexResultArray(int integrityLevel, DynamicArrayCache cache) {
        super(integrityLevel, cache);
    }

    private static Object[] getArray(DynamicObject object) {
        return (Object[]) arrayGetArray(object);
    }

    public static Object materializeGroup(TRegexUtil.TRegexMaterializeResultNode materializeResultNode, DynamicObject object, int index,
                    DynamicObjectLibrary lazyRegexResultNode, DynamicObjectLibrary lazyRegexResultOriginalInputNode) {
        Object[] internalArray = getArray(object);
        if (internalArray[index] == null) {
            internalArray[index] = materializeResultNode.materializeGroup(arrayGetRegexResult(object, lazyRegexResultNode), index,
                            arrayGetRegexResultOriginalInput(object, lazyRegexResultOriginalInputNode));
        }
        return internalArray[index];
    }

    public ScriptArray createWritable(TRegexUtil.TRegexMaterializeResultNode materializeResultNode, DynamicObject object, long index, Object value) {
        for (int i = 0; i < lengthInt(object); i++) {
            materializeGroup(materializeResultNode, object, i, DynamicObjectLibrary.getUncached(), DynamicObjectLibrary.getUncached());
        }
        final Object[] internalArray = getArray(object);
        AbstractObjectArray newArray = ZeroBasedObjectArray.makeZeroBasedObjectArray(object, internalArray.length, internalArray.length, internalArray, integrityLevel);
        if (JSConfig.TraceArrayTransitions) {
            traceArrayTransition(this, newArray, index, value);
        }
        return newArray;
    }

    @Override
    public Object getElementInBounds(DynamicObject object, int index) {
        final Object[] internalArray = getArray(object);
        if (internalArray[index] == null) {
            internalArray[index] = TRegexUtil.TRegexMaterializeResultNode.getUncached().materializeGroup(
                            arrayGetRegexResult(object, DynamicObjectLibrary.getUncached()), index,
                            arrayGetRegexResultOriginalInput(object, DynamicObjectLibrary.getUncached()));
        }
        return internalArray[index];
    }

    @Override
    public boolean hasElement(DynamicObject object, long index) {
        return index >= 0 && index < lengthInt(object);
    }

    @Override
    public int lengthInt(DynamicObject object) {
        return (int) arrayGetLength(object);
    }

    @Override
    public AbstractObjectArray createWriteableObject(DynamicObject object, long index, Object value, ProfileHolder profile) {
        Object[] array = TRegexUtil.TRegexMaterializeResultNode.getUncached().materializeFull(
                        arrayGetRegexResult(object, DynamicObjectLibrary.getUncached()), lengthInt(object),
                        arrayGetRegexResultOriginalInput(object, DynamicObjectLibrary.getUncached()));
        AbstractObjectArray newArray;
        newArray = ZeroBasedObjectArray.makeZeroBasedObjectArray(object, array.length, array.length, array, integrityLevel);
        if (JSConfig.TraceArrayTransitions) {
            traceArrayTransition(this, newArray, index, value);
        }
        return newArray;
    }

    @Override
    public AbstractObjectArray createWriteableInt(DynamicObject object, long index, int value, ProfileHolder profile) {
        return createWriteableObject(object, index, value, profile);
    }

    @Override
    public AbstractObjectArray createWriteableDouble(DynamicObject object, long index, double value, ProfileHolder profile) {
        return createWriteableObject(object, index, value, profile);
    }

    @Override
    public AbstractObjectArray createWriteableJSObject(DynamicObject object, long index, JSDynamicObject value, ProfileHolder profile) {
        return createWriteableObject(object, index, value, profile);
    }

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

    @Override
    public ScriptArray setLengthImpl(DynamicObject object, long length, ProfileHolder profile) {
        return createWriteableObject(object, length - 1, null, ProfileHolder.empty()).setLengthImpl(object, length, profile);
    }

    @Override
    public ScriptArray addRangeImpl(DynamicObject object, long offset, int size) {
        return createWriteableObject(object, offset, null, ProfileHolder.empty()).addRangeImpl(object, offset, size);
    }

    @Override
    public ScriptArray removeRangeImpl(DynamicObject object, long start, long end) {
        return createWriteableObject(object, start, null, ProfileHolder.empty()).removeRangeImpl(object, start, end);
    }

    @Override
    public Object[] toArray(DynamicObject object) {
        return TRegexUtil.TRegexMaterializeResultNode.getUncached().materializeFull(
                        arrayGetRegexResult(object, DynamicObjectLibrary.getUncached()), lengthInt(object),
                        arrayGetRegexResultOriginalInput(object, DynamicObjectLibrary.getUncached()));
    }

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

    @Override
    protected DynamicArray withIntegrityLevel(int newIntegrityLevel) {
        return new LazyRegexResultArray(newIntegrityLevel, cache);
    }
}