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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 com.oracle.truffle.api.object.DynamicObject;
import com.oracle.truffle.js.lang.JavaScriptLanguage;
import com.oracle.truffle.js.runtime.JSConfig;
import com.oracle.truffle.js.runtime.JSContext;
import com.oracle.truffle.js.runtime.array.DynamicArray;
import com.oracle.truffle.js.runtime.array.ScriptArray;
import com.oracle.truffle.js.runtime.builtins.JSArray;
import com.oracle.truffle.js.runtime.builtins.JSRegExp;
import com.oracle.truffle.js.runtime.objects.JSDynamicObject;
import com.oracle.truffle.js.runtime.objects.Undefined;
import com.oracle.truffle.js.runtime.util.TRegexUtil;
import com.oracle.truffle.js.runtime.util.TRegexUtil.Constants;

public final class LazyRegexResultIndicesArray extends AbstractConstantArray {

    public static final LazyRegexResultIndicesArray LAZY_REGEX_RESULT_INDICES_ARRAY = new LazyRegexResultIndicesArray(INTEGRITY_LEVEL_NONE, createCache());

    public static LazyRegexResultIndicesArray createLazyRegexResultIndicesArray() {
        return LAZY_REGEX_RESULT_INDICES_ARRAY;
    }

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

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

    public static Object materializeGroup(JSContext context, TRegexUtil.TRegexResultAccessor resultAccessor, DynamicObject object, int index) {
        Object[] internalArray = getArray(object);
        if (internalArray[index] == null) {
            internalArray[index] = getIntIndicesArray(context, resultAccessor, getRegexResultSlow(object), index);
        }
        return internalArray[index];
    }

    private static Object getRegexResultSlow(DynamicObject object) {
        assert JSArray.isJSArray(object) && JSArray.arrayGetArrayType(object) == LAZY_REGEX_RESULT_INDICES_ARRAY;
        return JSDynamicObject.getOrNull(object, JSRegExp.GROUPS_RESULT_ID);
    }

    public static Object getIntIndicesArray(JSContext context, TRegexUtil.TRegexResultAccessor resultAccessor, Object regexResult, int index) {
        final int beginIndex = resultAccessor.captureGroupStart(regexResult, index);
        if (beginIndex == Constants.CAPTURE_GROUP_NO_MATCH) {
            assert index > 0;
            return Undefined.instance;
        }
        int[] intArray = new int[]{beginIndex, resultAccessor.captureGroupEnd(regexResult, index)};
        return JSArray.createConstantIntArray(context, intArray);
    }

    public ScriptArray createWritable(JSContext context, TRegexUtil.TRegexResultAccessor resultAccessor, DynamicObject object, long index, Object value) {
        for (int i = 0; i < lengthInt(object); i++) {
            materializeGroup(context, resultAccessor, object, i);
        }
        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) {
        return materializeGroup(JavaScriptLanguage.getCurrentJSRealm().getContext(), TRegexUtil.TRegexResultAccessor.getUncached(), object, 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 = materializeFull(TRegexUtil.TRegexResultAccessor.getUncached(), object, lengthInt(object));
        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 materializeFull(TRegexUtil.TRegexResultAccessor.getUncached(), object, lengthInt(object));
    }

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

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

    protected static Object[] materializeFull(TRegexUtil.TRegexResultAccessor resultAccessor, DynamicObject object, int groupCount) {
        Object[] result = new Object[groupCount];
        for (int i = 0; i < groupCount; ++i) {
            result[i] = materializeGroup(JavaScriptLanguage.getCurrentJSRealm().getContext(), resultAccessor, object, i);
        }
        return result;
    }

}