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package org.netbeans.html.boot.impl;

import java.io.IOException;

import java.lang.reflect.Field;

import java.lang.reflect.Method;

import java.util.List;

import java.util.Locale;

import javax.tools.Diagnostic;

import javax.tools.JavaFileObject;

import static org.testng.Assert.assertEquals;

import static org.testng.Assert.assertTrue;

import static org.testng.Assert.fail;

import org.testng.annotations.Test;

/**

 *

 * @author Jaroslav Tulach

 */

public class JavaScriptProcesorTest {

    @Test public void detectCallbackToNonExistingClass() throws IOException {

        String code = "package x.y.z;\n"

            + "import net.java.html.js.JavaScriptBody;\n"

            + "class X {\n"

            + "  @JavaScriptBody(args={\"r\"}, javacall=true, body =\n"

            + "    \"r.@java.lang.Runable::run()();\"\n" // typo

            + "  )\n"

            + "  private static native void callback(Runnable r);\n"

            + "}\n";

        Compile c = Compile.create("", code);

        c.assertErrors();

        c.assertError("java.lang.Runable"); // typo

    }

    @Test public void detectCallbackToNonExistingMethod() throws IOException {

        String code = "package x.y.z;\n"

            + "import net.java.html.js.JavaScriptBody;\n"

            + "class X {\n"

            + "  @JavaScriptBody(args={\"r\"}, javacall=true, body =\n"

            + "    \"r.@java.lang.Runnable::cancel()();\"\n"

            + "  )\n"

            + "  private static native void callback(Runnable r);\n"

            + "}\n";

        Compile c = Compile.create("", code);

        c.assertErrors();

        c.assertError("method cancel");

    }

    @Test public void detectCallbackToNonExistingParams() throws IOException {

        String code = "package x.y.z;\n"

            + "import net.java.html.js.JavaScriptBody;\n"

            + "class X {\n"

            + "  @JavaScriptBody(args={\"r\"}, javacall=true, body =\n"

            + "    \"r.@java.lang.Runnable::run(I)(10);\"\n"

            + "  )\n"

            + "  private static native void callback(Runnable r);\n"

            + "}\n";

        Compile c = Compile.create("", code);

        c.assertErrors();

        c.assertError("wrong parameters: (I)");

    }

    @Test public void objectTypeParamsAreOK() throws IOException {

        String code = "package x.y.z;\n"

            + "import net.java.html.js.JavaScriptBody;\n"

            + "class X {\n"

            + "  @JavaScriptBody(args={\"r\"}, javacall=true, body =\n"

            + "    \"r.@java.lang.Object::equals(Ljava/lang/Object;)(null);\"\n"

            + "  )\n"

            + "  private static native void testEqual(Object r);\n"

            + "}\n";

        Compile c = Compile.create("", code);

        c.assertNoErrors();

    }

    @Test public void misorderNotified() throws IOException {

        String code = "package x.y.z;\n"

            + "import net.java.html.js.JavaScriptBody;\n"

            + "class X {\n"

            + "  @JavaScriptBody(args={\"r\", \"a\", \"b\"}, body =\"\"\n"

            + "  )\n"

            + "  private static native void testEqual(Object p, String q, int r);\n"

            + "}\n";

        Compile c = Compile.create("", code);

        List<Diagnostic<? extends JavaFileObject>> warnings = c.getDiagnostics(Diagnostic.Kind.WARNING);

        assertTrue(warnings.size() >= 1, "There are warnings: " + warnings);

        for (Diagnostic<? extends JavaFileObject> w : warnings) {

            if (w.getMessage(Locale.US).contains("Actual method parameter names and args")) {

                return;

            }

        }

        fail("Expecting order warning: " + warnings);

    }

    @Test public void needJavaScriptBodyToUseResource() throws IOException {

        String code = "package x.y.z;\n"

            + "import net.java.html.js.JavaScriptResource;\n"

            + "@JavaScriptResource(\"x.html\")\n"

            + "class X {\n"

            + "  private static native void callback(Runnable r);\n"

            + "}\n";

        Compile c = Compile.create("", code);

        c.assertErrors();

        c.assertError("needs @JavaScriptBody");

    }

    @Test public void generatesCallbacksThatReturnObject() throws Exception {

        Class<?> callbacksForTestPkg = Class.forName("org.netbeans.html.boot.impl.$JsCallbacks$");

        Method m = callbacksForTestPkg.getDeclaredMethod("java_lang_Runnable$run$", Runnable.class);

        assertEquals(m.getReturnType(), java.lang.Object.class, "All methods always return object");

    }

    @Test public void hasInstanceField() throws Exception {

        Class<?> callbacksForTestPkg = Class.forName("org.netbeans.html.boot.impl.$JsCallbacks$");

        Field f = callbacksForTestPkg.getDeclaredField("VM");

        f.setAccessible(true);

        assertTrue(callbacksForTestPkg.isInstance(f.get(null)), "Singleton field VM");

    }

}