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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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package com.oracle.truffle.js.nodes.access;

import com.oracle.truffle.api.dsl.Cached;
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.object.DynamicObject;
import com.oracle.truffle.js.nodes.JavaScriptNode;
import com.oracle.truffle.js.runtime.Errors;
import com.oracle.truffle.js.runtime.JSContext;
import com.oracle.truffle.js.runtime.JSRealm;
import com.oracle.truffle.js.runtime.builtins.JSGlobal;
import com.oracle.truffle.js.runtime.objects.JSAttributes;
import com.oracle.truffle.js.runtime.objects.JSObject;
import com.oracle.truffle.js.runtime.objects.JSObjectUtil;
import com.oracle.truffle.js.runtime.objects.PropertyDescriptor;
import com.oracle.truffle.js.runtime.objects.Undefined;

import java.util.Set;

public abstract class DeclareGlobalFunctionNode extends DeclareGlobalNode {
    private final boolean configurable;
    @Child protected JavaScriptNode valueNode;
    @Child private JSGetOwnPropertyNode getOwnPropertyNode;
    @Child private IsExtensibleNode isExtensibleNode = IsExtensibleNode.create();

    protected DeclareGlobalFunctionNode(String varName, boolean configurable, JavaScriptNode valueNode) {
        super(varName);
        this.configurable = configurable;
        this.valueNode = valueNode;
        this.getOwnPropertyNode = JSGetOwnPropertyNode.create(false);
    }

    public static DeclareGlobalFunctionNode create(String varName, boolean configurable, JavaScriptNode valueNode) {
        return DeclareGlobalFunctionNodeGen.create(varName, configurable, valueNode);
    }

    @Override
    public void verify(JSContext context, JSRealm realm) {
        super.verify(context, realm);
        // CanDeclareGlobalFunction
        DynamicObject globalObject = realm.getGlobalObject();
        PropertyDescriptor desc = getOwnPropertyNode.execute(globalObject, varName);
        if (desc == null) {
            if (!isExtensibleNode.executeBoolean(globalObject)) {
                errorProfile.enter();
                throw Errors.createTypeErrorGlobalObjectNotExtensible(this);
            }
        } else {
            if (!desc.getConfigurable() && !(desc.isDataDescriptor() && desc.getWritable() && desc.getEnumerable())) {
                errorProfile.enter();
                throw Errors.createTypeErrorCannotDeclareGlobalFunction(varName, this);
            }
        }
    }

    @Override
    public final void executeVoid(VirtualFrame frame, JSContext context, JSRealm realm) {
        Object value = valueNode == null ? Undefined.instance : valueNode.execute(frame);
        DynamicObject globalObject = realm.getGlobalObject();
        PropertyDescriptor desc = getOwnPropertyNode.execute(globalObject, varName);
        executeVoid(globalObject, value, desc, context);
    }

    protected abstract void executeVoid(DynamicObject globalObject, Object value, PropertyDescriptor desc, JSContext context);

    @Specialization(guards = {"context.getPropertyCacheLimit() > 0", "isJSGlobalObject(globalObject)", "desc == null"})
    protected void doCached(DynamicObject globalObject, Object value, @SuppressWarnings("unused") PropertyDescriptor desc, @SuppressWarnings("unused") JSContext context,
                    @Cached("makeDefineOwnPropertyCache(context)") PropertySetNode cache) {
        cache.setValue(globalObject, value);
    }

    @Specialization(replaces = {"doCached"})
    protected void doUncached(DynamicObject globalObject, Object value, PropertyDescriptor desc, JSContext context) {
        if (valueNode == null && desc == null && JSGlobal.isJSGlobalObject(globalObject)) {
            JSObjectUtil.putDeclaredDataProperty(context, globalObject, varName, value, getAttributeFlags());
        } else {
            if (desc == null || desc.getConfigurable()) {
                JSObject.defineOwnProperty(globalObject, varName, PropertyDescriptor.createData(value, true, true, configurable), true);
            } else {
                JSObject.defineOwnProperty(globalObject, varName, PropertyDescriptor.createData(value), true);
            }
        }
    }

    private int getAttributeFlags() {
        return configurable ? JSAttributes.configurableEnumerableWritable() : JSAttributes.notConfigurableEnumerableWritable();
    }

    protected final PropertySetNode makeDefineOwnPropertyCache(JSContext context) {
        return PropertySetNode.createImpl(varName, false, context, true, true, getAttributeFlags(), valueNode == null);
    }

    @Override
    public boolean isGlobalFunctionDeclaration() {
        return true;
    }

    @Override
    protected DeclareGlobalNode copyUninitialized(Set<Class<? extends Tag>> materializedTags) {
        return create(varName, configurable, JavaScriptNode.cloneUninitialized(valueNode, materializedTags));
    }
}