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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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 * Software and the Larger Work(s), and to sublicense the foregoing rights on
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package com.oracle.truffle.js.nodes.unary;

import com.oracle.truffle.api.dsl.Cached;
import com.oracle.truffle.api.dsl.Specialization;
import com.oracle.truffle.api.instrumentation.Tag;
import com.oracle.truffle.api.nodes.NodeInfo;
import com.oracle.truffle.js.nodes.JavaScriptNode;
import com.oracle.truffle.js.nodes.access.JSConstantNode;
import com.oracle.truffle.js.nodes.access.JSConstantNode.JSConstantIntegerNode;
import com.oracle.truffle.js.nodes.cast.JSToNumericNode;
import com.oracle.truffle.js.nodes.instrumentation.JSTags;
import com.oracle.truffle.js.nodes.instrumentation.JSTags.UnaryOperationTag;
import com.oracle.truffle.js.runtime.BigInt;
import com.oracle.truffle.js.runtime.JSConfig;

import java.util.Set;

@NodeInfo(shortName = "-")
public abstract class JSUnaryMinusNode extends JSUnaryNode {

    protected JSUnaryMinusNode(JavaScriptNode operand) {
        super(operand);
    }

    public static JavaScriptNode create(JavaScriptNode operand) {
        if (JSConfig.UseSuperOperations && operand instanceof JSConstantIntegerNode) {
            int value = ((JSConstantIntegerNode) operand).executeInt(null);
            if (value == 0) {
                return JSConstantNode.createDouble(-0.0); // negative zero
            } else {
                return JSConstantNode.createInt(-value);
            }
        }
        return JSUnaryMinusNodeGen.create(operand);
    }

    protected static JSUnaryMinusNode create() {
        return JSUnaryMinusNodeGen.create(null);
    }

    @Override
    public boolean hasTag(Class<? extends Tag> tag) {
        if (tag == UnaryOperationTag.class) {
            return true;
        } else {
            return super.hasTag(tag);
        }
    }

    @Override
    public Object getNodeObject() {
        return JSTags.createNodeObjectDescriptor("operator", getClass().getAnnotation(NodeInfo.class).shortName());
    }

    public abstract Object execute(Object value);

    @Specialization(guards = "isInt(a)")
    protected static int doInt(int a) {
        return -a;
    }

    protected static boolean isInt(int a) {
        return a > Integer.MIN_VALUE && a != 0;
    }

    @Specialization
    protected static double doDouble(double a) {
        return -a;
    }

    @Specialization
    protected static BigInt doBigInt(BigInt a) {
        return a.negate();
    }

    @Specialization
    protected static Object doGeneric(Object a,
                    @Cached("create()") JSToNumericNode toNumericNode,
                    @Cached("create()") JSUnaryMinusNode recursiveUnaryMinus) {
        Object value = toNumericNode.execute(a);
        return recursiveUnaryMinus.execute(value);
    }

    @Override
    public boolean isResultAlwaysOfType(Class<?> clazz) {
        return clazz == Number.class;
    }

    @Override
    protected JavaScriptNode copyUninitialized(Set<Class<? extends Tag>> materializedTags) {
        return JSUnaryMinusNodeGen.create(cloneUninitialized(getOperand(), materializedTags));
    }
}