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

import static com.oracle.truffle.js.lang.JavaScriptLanguage.ID;
import static org.junit.Assert.assertSame;

import org.graalvm.polyglot.Context;
import org.graalvm.polyglot.Engine;
import org.graalvm.polyglot.Value;
import org.junit.Test;

import com.oracle.truffle.api.object.DynamicObject;
import com.oracle.truffle.api.object.Shape;
import com.oracle.truffle.js.lang.JavaScriptLanguage;
import com.oracle.truffle.js.runtime.objects.JSObject;
import com.oracle.truffle.js.test.JSTest;

public class MultiContextShapeTest {

    @Test
    public void ordinaryObjectShape() {
        testSameShapeAcrossContexts("({key: 'value'});");
        testSameShapeAcrossContexts("Object.create(null);");
        testSameShapeAcrossContexts("Object.create({});");
    }

    @Test
    public void arrayShape() {
        testSameShapeAcrossContexts("[3,1,4,1,5,9,2,6,5,3,5,9]");
    }

    @Test
    public void promiseShape() {
        testSameShapeAcrossContexts("Promise.resolve(42);");
    }

    @Test
    public void functionShape() {
        testSameShapeAcrossContexts("(function() {});");
        testSameShapeAcrossContexts("function foo() {} foo;");
    }

    @Test
    public void argumentsShape() {
        testSameShapeAcrossContexts("(function() {return arguments;})();");
        testSameShapeAcrossContexts("(function() {'use strict'; return arguments;})();");
    }

    @Test
    public void classShape() {
        testSameShapeAcrossContexts("class C {} C;");
        testSameShapeAcrossContexts("class C extends null {} C;");
    }

    private static void testSameShapeAcrossContexts(String source) {
        try (Engine engine = JSTest.newEngineBuilder().build()) {
            Shape lastShape = null;
            for (int i = 0; i < 2; i++) {
                try (Context c = JSTest.newContextBuilder().engine(engine).build()) {
                    Value object = c.eval(ID, source);
                    DynamicObject jsobject = unwrapJSObject(c, object);
                    Shape objShape = jsobject.getShape();
                    if (lastShape != null) {
                        assertSame(lastShape, objShape);
                    }
                    lastShape = objShape;
                }
            }
        }
    }

    private static DynamicObject unwrapJSObject(Context c, Value value) {
        final String key = "_testObject";
        c.getBindings(ID).putMember(key, value);
        return (DynamicObject) JSObject.get(JavaScriptLanguage.getJSRealm(c).getGlobalObject(), key);
    }

}