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 * The Universal Permissive License (UPL), Version 1.0
 *
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 * person obtaining a copy of this software, associated documentation and/or
 * data (collectively the "Software"), free of charge and under any and all
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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
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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.dsl.ImportStatic;
import com.oracle.truffle.api.dsl.Specialization;
import com.oracle.truffle.api.frame.VirtualFrame;
import com.oracle.truffle.api.instrumentation.Tag;
import com.oracle.truffle.api.interop.InteropLibrary;
import com.oracle.truffle.api.interop.UnsupportedMessageException;
import com.oracle.truffle.api.library.CachedLibrary;
import com.oracle.truffle.api.object.DynamicObject;
import com.oracle.truffle.js.nodes.JavaScriptNode;
import com.oracle.truffle.js.nodes.access.JSConstantNode;
import com.oracle.truffle.js.nodes.access.JSConstantNode.JSConstantBigIntNode;
import com.oracle.truffle.js.nodes.access.JSConstantNode.JSConstantIntegerNode;
import com.oracle.truffle.js.nodes.unary.JSUnaryNode;
import com.oracle.truffle.js.runtime.BigInt;
import com.oracle.truffle.js.runtime.Errors;
import com.oracle.truffle.js.runtime.JSConfig;
import com.oracle.truffle.js.runtime.JSRuntime;
import com.oracle.truffle.js.runtime.Symbol;
import com.oracle.truffle.js.runtime.objects.JSLazyString;

import java.util.Set;

@ImportStatic({JSRuntime.class, JSConfig.class})
public abstract class JSToBooleanNode extends JSUnaryNode {

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

    @Override
    public final Object execute(VirtualFrame frame) {
        return executeBoolean(frame);
    }

    @Override
    public abstract boolean executeBoolean(VirtualFrame frame);

    public abstract boolean executeBoolean(Object value);

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

    public static JSToBooleanNode create() {
        return JSToBooleanNodeGen.create(null);
    }

    public static JavaScriptNode create(JavaScriptNode child) {
        JSConstantNode replacement = null;
        if (child.isResultAlwaysOfType(boolean.class)) {
            return child;
        } else if (child instanceof JSConstantIntegerNode) {
            int value = ((JSConstantIntegerNode) child).executeInt(null);
            replacement = JSConstantNode.createBoolean(value != 0);
        } else if (child instanceof JSConstantBigIntNode) {
            BigInt value = ((JSConstantBigIntNode) child).executeBigInt(null);
            replacement = JSConstantNode.createBoolean(value.compareTo(BigInt.ZERO) != 0);
        } else if (child instanceof JSConstantNode) {
            Object constantOperand = ((JSConstantNode) child).getValue();
            if (constantOperand != null && JSRuntime.isJSPrimitive(constantOperand)) {
                replacement = JSConstantNode.createBoolean(JSRuntime.toBoolean(constantOperand));
            }
        }
        if (replacement == null) {
            return JSToBooleanNodeGen.create(child);
        } else {
            transferSourceSectionAndTags(child, replacement);
            return replacement;
        }
    }

    @Specialization
    protected boolean doBoolean(boolean value) {
        return value;
    }

    @Specialization(guards = "isJSNull(value)")
    protected boolean doNull(@SuppressWarnings("unused") Object value) {
        return false;
    }

    @Specialization(guards = "isUndefined(value)")
    protected boolean doUndefined(@SuppressWarnings("unused") Object value) {
        return false;
    }

    @Specialization
    protected boolean doInt(int value) {
        return value != 0;
    }

    @Specialization
    protected boolean doLong(long value) {
        return value != 0L;
    }

    @Specialization
    protected boolean doDouble(double value) {
        return value != 0.0 && !Double.isNaN(value);
    }

    @Specialization
    protected boolean doBigInt(BigInt value) {
        return value.compareTo(BigInt.ZERO) != 0;
    }

    @Specialization
    protected boolean doLazyString(JSLazyString value) {
        return !value.isEmpty();
    }

    @Specialization
    protected boolean doString(String value) {
        return value.length() > 0;
    }

    @Specialization(guards = "isJSObject(value)")
    protected boolean doObject(@SuppressWarnings("unused") DynamicObject value) {
        return true;
    }

    @Specialization
    protected boolean doSymbol(@SuppressWarnings("unused") Symbol value) {
        return true;
    }

    @Specialization(guards = "isForeignObject(value)", limit = "InteropLibraryLimit")
    protected boolean doForeignObject(Object value,
                    @CachedLibrary("value") InteropLibrary interop) {
        if (interop.isNull(value)) {
            return false;
        }
        try {
            if (interop.isBoolean(value)) {
                return interop.asBoolean(value);
            } else if (interop.isString(value)) {
                return !interop.asString(value).isEmpty();
            } else if (interop.isNumber(value)) {
                if (interop.fitsInInt(value)) {
                    return doInt(interop.asInt(value));
                } else if (interop.fitsInLong(value)) {
                    return doLong(interop.asLong(value));
                } else if (interop.fitsInDouble(value)) {
                    return doDouble(interop.asDouble(value));
                } else {
                    return true;
                }
            }
        } catch (UnsupportedMessageException e) {
            throw Errors.createTypeErrorUnboxException(value, e, this);
        }
        return true; // cf. doObject()
    }

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