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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.cast;

import com.oracle.truffle.api.CompilerDirectives;
import com.oracle.truffle.api.dsl.Specialization;
import com.oracle.truffle.api.instrumentation.Tag;
import com.oracle.truffle.js.nodes.JavaScriptBaseNode;
import com.oracle.truffle.js.nodes.JavaScriptNode;
import com.oracle.truffle.js.nodes.access.JSConstantNode;
import com.oracle.truffle.js.nodes.cast.JSToNumericNodeGen.JSToNumericWrapperNodeGen;
import com.oracle.truffle.js.nodes.unary.JSUnaryNode;
import com.oracle.truffle.js.runtime.BigInt;
import com.oracle.truffle.js.runtime.JSRuntime;
import com.oracle.truffle.js.runtime.Symbol;

import java.util.Set;

public abstract class JSToNumericNode extends JavaScriptBaseNode {

    @Child private JSToNumberNode toNumberNode;
    @Child private JSToPrimitiveNode toPrimitiveNode;

    public abstract Object execute(Object value);

    protected JSToNumericNode() {
        super();
    }

    public static JSToNumericNode create() {
        return JSToNumericNodeGen.create();
    }

    public static JavaScriptNode create(JavaScriptNode child) {
        if (child.isResultAlwaysOfType(Number.class) || child.isResultAlwaysOfType(int.class) || child.isResultAlwaysOfType(double.class)) {
            return child;
        }
        if (child instanceof JSConstantNode) {
            Object constantOperand = ((JSConstantNode) child).getValue();
            if (constantOperand != null && !(constantOperand instanceof Symbol) && JSRuntime.isJSPrimitive(constantOperand)) {
                return JSConstantNode.create(JSRuntime.toNumeric(constantOperand));
            }
        }
        return JSToNumericWrapperNodeGen.create(child);
    }

    @Specialization
    protected static int doInt(int value) {
        return value;
    }

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

    @Specialization
    protected Object doBigInt(BigInt value) {
        return value;
    }

    @Specialization(guards = "isJSBigInt(value)")
    protected Object doJSBigInt(Object value) {
        return toPrimitive(value);
    }

    @Specialization(guards = "!isJSBigInt(value)")
    protected Object doOther(Object value) {
        Object primValue = toPrimitive(value);
        if (JSRuntime.isBigInt(primValue)) {
            return primValue;
        }
        return toNumber(primValue);
    }

    private Number toNumber(Object value) {
        if (toNumberNode == null) {
            CompilerDirectives.transferToInterpreterAndInvalidate();
            toNumberNode = insert(JSToNumberNode.create());
        }
        return toNumberNode.executeNumber(value);
    }

    private Object toPrimitive(Object value) {
        if (toPrimitiveNode == null) {
            CompilerDirectives.transferToInterpreterAndInvalidate();
            toPrimitiveNode = insert(JSToPrimitiveNode.createHintNumber());
        }
        return toPrimitiveNode.execute(value);
    }

    public abstract static class JSToNumericWrapperNode extends JSUnaryNode {

        @Child private JSToNumericNode toNumericNode;

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

        @Specialization
        protected Object doDefault(Object value) {
            if (toNumericNode == null) {
                CompilerDirectives.transferToInterpreterAndInvalidate();
                toNumericNode = insert(JSToNumericNode.create());
            }
            return toNumericNode.execute(value);
        }

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

        @Override
        public String expressionToString() {
            return getOperand().expressionToString();
        }
    }
}