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

import java.util.Set;

import com.oracle.truffle.api.CompilerDirectives;
import com.oracle.truffle.api.dsl.Cached;
import com.oracle.truffle.api.dsl.Fallback;
import com.oracle.truffle.api.dsl.NeverDefault;
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.strings.TruffleString;
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.JSGlobalObject;
import com.oracle.truffle.js.runtime.objects.JSAttributes;
import com.oracle.truffle.js.runtime.objects.JSDynamicObject;
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;

public abstract class DeclareGlobalVariableNode extends DeclareGlobalNode {
    private final boolean configurable;
    @Child private HasPropertyCacheNode hasOwnPropertyNode;
    @Child private IsExtensibleNode isExtensibleNode = IsExtensibleNode.create();

    protected DeclareGlobalVariableNode(TruffleString varName, boolean configurable) {
        super(varName);
        this.configurable = configurable;
    }

    public static DeclareGlobalVariableNode create(TruffleString varName, boolean configurable) {
        return DeclareGlobalVariableNodeGen.create(varName, configurable);
    }

    @Override
    public void verify(JSContext context, JSRealm realm) {
        super.verify(context, realm);
        JSDynamicObject globalObject = realm.getGlobalObject();
        if (hasOwnPropertyNode == null) {
            CompilerDirectives.transferToInterpreterAndInvalidate();
            hasOwnPropertyNode = insert(HasPropertyCacheNode.create(varName, context, true));
        }
        // CanDeclareGlobalVar
        if (!hasOwnPropertyNode.hasProperty(globalObject)) {
            if (!isExtensibleNode.executeBoolean(globalObject)) {
                errorProfile.enter();
                throw Errors.createTypeErrorGlobalObjectNotExtensible(this);
            }
        }
    }

    @Override
    public final void executeVoid(VirtualFrame frame, JSContext context, JSRealm realm) {
        JSDynamicObject globalObject = realm.getGlobalObject();
        if (!hasOwnPropertyNode.hasProperty(globalObject)) {
            assert JSObject.isExtensible(globalObject);
            executeVoid(globalObject, context);
        }
    }

    protected abstract void executeVoid(JSDynamicObject globalObject, JSContext context);

    @Specialization(guards = {"context.getPropertyCacheLimit() > 0"})
    protected void doCached(JSGlobalObject globalObject, @SuppressWarnings("unused") JSContext context,
                    @Cached("makeDefineOwnPropertyCache(context)") PropertySetNode cache) {
        cache.setValue(globalObject, Undefined.instance);
    }

    @Specialization(replaces = {"doCached"})
    protected void doUncached(JSGlobalObject globalObject, JSContext context) {
        JSObjectUtil.defineConstantDataProperty(context, globalObject, varName, Undefined.instance, getAttributeFlags());
    }

    @Fallback
    protected void doGeneric(JSDynamicObject globalObject, @SuppressWarnings("unused") JSContext context) {
        assert !(globalObject instanceof JSGlobalObject);
        PropertyDescriptor desc = configurable ? PropertyDescriptor.undefinedDataDesc : PropertyDescriptor.undefinedDataDescNotConfigurable;
        JSObject.defineOwnProperty(globalObject, varName, desc, true);
    }

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

    @NeverDefault
    protected final PropertySetNode makeDefineOwnPropertyCache(JSContext context) {
        return PropertySetNode.createImpl(varName, false, context, true, true, getAttributeFlags(), true);
    }

    @Override
    protected DeclareGlobalNode copyUninitialized(Set> materializedTags) {
        return create(varName, configurable);
    }
}