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

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

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

import com.oracle.truffle.js.lang.JavaScriptLanguage;
import com.oracle.truffle.js.runtime.JSContextOptions;
import com.oracle.truffle.js.test.JSTest;

public class FunctionTest {

    @Test
    public void testInstantiate() {
        try (Context context = JSTest.newContextBuilder().build()) {
            Value functionHolder = context.eval(JavaScriptLanguage.ID, "({ fn: function(arg) { this.arg = arg; } })");
            Value function = functionHolder.getMember("fn");

            // function should be instantiable
            assertTrue(function.canInstantiate());
            Value instance = function.newInstance(42);

            // verify that the argument was passed correctly
            assertTrue(instance.hasMember("arg"));
            Value argument = instance.getMember("arg");
            assertTrue(argument.fitsInInt());
            assertEquals(42, argument.asInt());

            // verify that the result is an instance of the original function
            Value instanceOf = context.eval("js", "(function(instance, fn) { return instance instanceof fn; })");
            assertTrue(instanceOf.canExecute());
            assertTrue(instanceOf.execute(instance, function).asBoolean());
        }
    }

    @Test
    public void testInteropBindMemberFunctions() throws Exception {
        Source source = Source.newBuilder(ID, "" +
                        "var ob = {v:2};\n" +
                        "var v = 0;" +
                        "var f = function(a) {\n" +
                        "  this.v += a;" +
                        "}\n" +
                        "ob.f = f;\n" +
                        "ob\n",
                        "bindTest.js").build();

        try (Context context = JSTest.newContextBuilder().option(JSContextOptions.BIND_MEMBER_FUNCTIONS_NAME, "true").build()) {
            Value object = context.eval(source);
            object.getMember("f").execute(40);
            Value result = object.getMember("v");
            assertTrue("Is number: " + result, result.isNumber());
            assertEquals(42, result.asInt());
        }

        try (Context context = JSTest.newContextBuilder().option(JSContextOptions.BIND_MEMBER_FUNCTIONS_NAME, "false").build()) {
            Value object = context.eval(source);
            object.getMember("f").execute(40);
            Value result = object.getMember("v");
            assertTrue("Is number: " + result, result.isNumber());
            assertEquals(2, result.asInt());
            result = context.getBindings(ID).getMember("v");
            assertTrue("Is number: " + result, result.isNumber());
            assertEquals(40, result.asInt());
        }

        // default
        try (Context context = JSTest.newContextBuilder().build()) {
            Value object = context.eval(source);
            object.getMember("f").execute(40);
            Value result = object.getMember("v");
            assertTrue("Is number: " + result, result.isNumber());
            assertEquals(42, result.asInt());
        }
    }

}