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package com.oracle.truffle.js.runtime.builtins;

import com.oracle.truffle.api.CompilerDirectives.TruffleBoundary;
import com.oracle.truffle.api.object.DynamicObject;
import com.oracle.truffle.api.object.Shape;
import com.oracle.truffle.js.runtime.JSConfig;
import com.oracle.truffle.js.runtime.JSContext;
import com.oracle.truffle.js.runtime.JSRealm;
import com.oracle.truffle.js.runtime.Symbol;
import com.oracle.truffle.js.runtime.array.ScriptArray;
import com.oracle.truffle.js.runtime.objects.Accessor;
import com.oracle.truffle.js.runtime.objects.JSAttributes;
import com.oracle.truffle.js.runtime.objects.JSObjectUtil;

public final class JSArgumentsArray extends JSAbstractArgumentsArray {
    public static final JSArgumentsArray INSTANCE = new JSArgumentsArray();

    private JSArgumentsArray() {
    }

    public static JSArgumentsObject.Unmapped createUnmapped(Shape shape, Object[] elements) {
        return new JSArgumentsObject.Unmapped(shape, ScriptArray.createConstantArray(elements), elements, elements.length);
    }

    public static JSArgumentsObject.Mapped createMapped(Shape shape, Object[] elements) {
        return new JSArgumentsObject.Mapped(shape, ScriptArray.createConstantArray(elements), elements, elements.length);
    }

    @TruffleBoundary
    public static DynamicObject createStrictSlow(JSRealm realm, Object[] elements) {
        JSContext context = realm.getContext();
        JSObjectFactory factory = context.getStrictArgumentsFactory();
        DynamicObject argumentsObject = createUnmapped(factory.getShape(realm), elements);
        factory.initProto(argumentsObject, realm);

        JSObjectUtil.putDataProperty(context, argumentsObject, LENGTH, elements.length, JSAttributes.configurableNotEnumerableWritable());
        JSObjectUtil.putDataProperty(context, argumentsObject, Symbol.SYMBOL_ITERATOR, realm.getArrayProtoValuesIterator(), JSAttributes.configurableNotEnumerableWritable());

        Accessor throwerAccessor = realm.getThrowerAccessor();
        JSObjectUtil.putBuiltinAccessorProperty(argumentsObject, CALLEE, throwerAccessor, JSAttributes.notConfigurableNotEnumerable());
        if (context.getEcmaScriptVersion() < JSConfig.ECMAScript2017) {
            JSObjectUtil.putBuiltinAccessorProperty(argumentsObject, CALLER, throwerAccessor, JSAttributes.notConfigurableNotEnumerable());
        }

        return context.trackAllocation(argumentsObject);
    }

    @TruffleBoundary
    public static DynamicObject createNonStrictSlow(JSRealm realm, Object[] elements, DynamicObject callee) {
        JSContext context = realm.getContext();
        JSObjectFactory factory = context.getNonStrictArgumentsFactory();
        DynamicObject argumentsObject = createMapped(factory.getShape(realm), elements);
        factory.initProto(argumentsObject, realm);

        JSObjectUtil.putDataProperty(context, argumentsObject, LENGTH, elements.length, JSAttributes.configurableNotEnumerableWritable());
        JSObjectUtil.putDataProperty(context, argumentsObject, Symbol.SYMBOL_ITERATOR, realm.getArrayProtoValuesIterator(), JSAttributes.configurableNotEnumerableWritable());

        JSObjectUtil.putDataProperty(context, argumentsObject, CALLEE, callee, JSAttributes.configurableNotEnumerableWritable());
        return context.trackAllocation(argumentsObject);
    }

    public static boolean isJSArgumentsObject(Object obj) {
        return obj instanceof JSArgumentsObject;
    }

    public static boolean isJSFastArgumentsObject(Object obj) {
        return isJSArgumentsObject(obj) && isInstance((JSArgumentsObject) obj, INSTANCE);
    }
}