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 * The Universal Permissive License (UPL), Version 1.0
 *
 * Subject to the condition set forth below, permission is hereby granted to any
 * person obtaining a copy of this software, associated documentation and/or
 * data (collectively the "Software"), free of charge and under any and all
 * copyright rights in the Software, and any and all patent rights owned or
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 * unmodified Software as contributed to or provided by such licensor, or (ii)
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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
 * one is included with the Software each a "Larger Work" to which the Software
 * is contributed by such licensors),
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 * without restriction, including without limitation the rights to copy, create
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 * Software and the Larger Work(s), and to sublicense the foregoing rights on
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 * This license is subject to the following condition:
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 * The above copyright notice and either this complete permission notice or at a
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package com.oracle.truffle.js.nodes.binary;

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.cast.JSToPrimitiveNode;
import com.oracle.truffle.js.nodes.cast.JSToStringOrNumberNode;
import com.oracle.truffle.js.runtime.BigInt;
import com.oracle.truffle.js.runtime.Boundaries;
import com.oracle.truffle.js.runtime.JSRuntime;
import com.oracle.truffle.js.runtime.SafeInteger;

import java.util.Set;

@NodeInfo(shortName = "<")
public abstract class JSLessThanNode extends JSCompareNode {

    protected JSLessThanNode(JavaScriptNode left, JavaScriptNode right) {
        super(left, right);
    }

    public static JSLessThanNode create(JavaScriptNode left, JavaScriptNode right) {
        return JSLessThanNodeGen.create(left, right);
    }

    public static JSLessThanNode create() {
        return JSLessThanNodeGen.create(null, null);
    }

    public abstract boolean executeBoolean(Object a, Object b);

    @Specialization
    protected boolean doInt(int a, int b) {
        return a < b;
    }

    @Specialization
    protected boolean doSafeInteger(int a, SafeInteger b) {
        return a < b.longValue();
    }

    @Specialization
    protected boolean doSafeInteger(SafeInteger a, int b) {
        return a.longValue() < b;
    }

    @Specialization
    protected boolean doSafeInteger(SafeInteger a, SafeInteger b) {
        return a.longValue() < b.longValue();
    }

    @Specialization
    protected boolean doDouble(double a, double b) {
        return a < b;
    }

    @Specialization
    protected boolean doString(String a, String b) {
        return Boundaries.stringCompareTo(a, b) < 0;
    }

    @Specialization
    protected boolean doStringDouble(String a, double b) {
        return doDouble(stringToDouble(a), b);
    }

    @Specialization
    protected boolean doDoubleString(double a, String b) {
        return doDouble(a, stringToDouble(b));
    }

    @Specialization
    protected boolean doStringBigInt(String a, BigInt b) {
        BigInt aBigInt = JSRuntime.stringToBigInt(a);
        return (aBigInt == null) ? false : doBigInt(aBigInt, b);
    }

    @Specialization
    protected boolean doBigIntString(BigInt a, String b) {
        BigInt bBigInt = JSRuntime.stringToBigInt(b);
        return (bBigInt == null) ? false : doBigInt(a, bBigInt);
    }

    @Specialization
    protected boolean doBigInt(BigInt a, BigInt b) {
        return a.compareTo(b) < 0;
    }

    @Specialization
    protected boolean doBigIntAndInt(BigInt a, int b) {
        return a.compareTo(BigInt.valueOf(b)) < 0;
    }

    @Specialization
    protected boolean doBigIntAndNumber(BigInt a, double b) {
        if (Double.isNaN(b)) {
            return false;
        }
        return a.compareValueTo(b) < 0;
    }

    @Specialization
    protected boolean doIntAndBigInt(int a, BigInt b) {
        return b.compareTo(BigInt.valueOf(a)) > 0;
    }

    @Specialization
    protected boolean doNumberAndBigInt(double a, BigInt b) {
        if (Double.isNaN(a)) {
            return false;
        }
        return b.compareValueTo(a) > 0;
    }

    @Specialization(guards = {"isJavaNumber(a)", "isJavaNumber(b)"})
    protected boolean doJavaNumber(Object a, Object b) {
        return doDouble(JSRuntime.doubleValue((Number) a), JSRuntime.doubleValue((Number) b));
    }

    @Specialization(replaces = {"doInt", "doDouble", "doString", "doStringDouble", "doDoubleString", "doBigInt", "doBigIntAndNumber", "doNumberAndBigInt", "doJavaNumber"})
    protected boolean doGeneric(Object a, Object b,
                    @Cached("create()") JSToStringOrNumberNode toStringOrNumber1,
                    @Cached("createHintNumber()") JSToPrimitiveNode toPrimitive1,
                    @Cached("create()") JSToStringOrNumberNode toStringOrNumber2,
                    @Cached("createHintNumber()") JSToPrimitiveNode toPrimitive2,
                    @Cached("create()") JSLessThanNode lessThanNode) {
        return lessThanNode.executeBoolean(toStringOrNumber1.execute(toPrimitive1.execute(a)), toStringOrNumber2.execute(toPrimitive2.execute(b)));
    }

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