/**

 * Back 2 Browser Bytecode Translator

 * Copyright (C) 2012-2015 Jaroslav Tulach <jaroslav.tulach@apidesign.org>

 *

 * This program is free software: you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation, version 2 of the License.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program. Look for COPYING file in the top folder.

 * If not, see http://opensource.org/licenses/GPL-2.0.

 */

package org.apidesign.bck2brwsr.tck;

import java.lang.annotation.Retention;

import java.lang.annotation.RetentionPolicy;

import java.lang.reflect.Constructor;

import java.lang.reflect.Method;

import java.lang.reflect.Proxy;

import java.util.Arrays;

import java.util.Collections;

import java.util.List;

import org.apidesign.bck2brwsr.core.JavaScriptBody;

import org.apidesign.bck2brwsr.vmtest.Compare;

import org.apidesign.bck2brwsr.vmtest.VMTest;

import org.testng.annotations.Factory;

/**

 *

 * @author Jaroslav Tulach <jtulach@netbeans.org>

 */

public class ReflectionTest {

    @Compare public boolean nonNullThis() {

        return this == null;

    }

    @Compare public String intType() {

        return Integer.TYPE.toString();

    }

    @Compare public String voidType() throws Exception {

        return void.class.toString();

    }

    @Compare public String longClass() {

        return long.class.toString();

    }

    @Compare public boolean isRunnableInterface() {

        return Runnable.class.isInterface();

    }

    @Compare public boolean isAssignableToPrimitiveType() {

        return boolean.class.isAssignableFrom(Runnable.class);

    }

    @Compare public boolean isAssignableFromPrimitiveType() {

        return Runnable.class.isAssignableFrom(boolean.class);

    }

    @Compare public boolean isAssignableLongFromInt() {

        return long.class.isAssignableFrom(int.class);

    }

    @Compare public boolean isAssignableIntFromLong() {

        return int.class.isAssignableFrom(long.class);

    }

    @Compare public String isRunnableHasRunMethod() throws NoSuchMethodException {

        return Runnable.class.getMethod("run").getName();

    }

    @Compare public String isRunnableDeclaresRunMethod() throws NoSuchMethodException {

        return Runnable.class.getDeclaredMethod("run").getName();

    }

    @Compare public String intValue() throws Exception {

        return Integer.class.getConstructor(int.class).newInstance(10).toString();

    }

    @Compare public String getMethodWithArray() throws Exception {

        return Proxy.class.getMethod("getProxyClass", ClassLoader.class, Class[].class).getName();

    }

    @Compare public String namesOfMethods() {

        StringBuilder sb = new StringBuilder();

        String[] arr = new String[20];

        int i = 0;

        for (Method m : StaticUse.class.getMethods()) {

            arr[i++] = m.getName();

        }

        for (String s : sort(arr, i)) {

            sb.append(s).append("\n");

        }

        return sb.toString();

    }

    @Compare

    public String namesOfDeclaredMethods() {

        StringBuilder sb = new StringBuilder();

        String[] arr = new String[20];

        Method[] methods = StaticUse.class.getDeclaredMethods();

        if (methods.length != 2) {

            throw new IllegalStateException("Expecting just two methods, was: " + methods.length);

        }

        int i = 0;

        for (Method m : methods) {

            arr[i++] = m.getName();

        }

        for (String s : sort(arr, i)) {

            sb.append(s).append("\n");

        }

        return sb.toString();

    }

    @Compare public String paramsOfConstructors() {

        StringBuilder sb = new StringBuilder();

        String[] arr = new String[20];

        int i = 0;

        for (Constructor<?> m : StaticUse.class.getConstructors()) {

            arr[i++] = m.getName();

        }

        for (String s : sort(arr, i)) {

            sb.append(s).append("\n");

        }

        return sb.toString();

    }

    @Compare public String namesOfDeclaringClassesOfMethods() {

        StringBuilder sb = new StringBuilder();

        String[] arr = new String[20];

        int i = 0;

        for (Method m : StaticUse.class.getMethods()) {

            arr[i++] = m.getName() + "@" + m.getDeclaringClass().getName();

        }

        for (String s : sort(arr, i)) {

            sb.append(s).append("\n");

        }

        return sb.toString();

    }

    @Compare public String cannotCallNonStaticMethodWithNull() throws Exception {

        StaticUse.class.getMethod("instanceMethod").invoke(null);

        return "should not happen";

    }

    @Compare public String classCastException() {

        try {

            Integer i = (Integer)StaticUseSub.getNonNull();

            return "" + i.intValue();

        } catch (ClassCastException ex) {

            return ex.getClass().getName();

        }

    }

    @Compare public String methodThatThrowsException() throws Exception {

        StaticUse.class.getMethod("instanceMethod").invoke(new StaticUse());

        return "should not happen";

    }

    @Compare public Object voidReturnType() throws Exception {

        return StaticUse.class.getMethod("instanceMethod").getReturnType();

    }

    @Retention(RetentionPolicy.RUNTIME)

    @interface Ann {

    }

    @Compare public String annoClass() throws Exception {

        Retention r = Ann.class.getAnnotation(Retention.class);

        assert r != null : "Annotation is present";

        assert r.value() == RetentionPolicy.RUNTIME : "Policy value is OK: " + r.value();

        return r.annotationType().getName();

    }

    @Compare public boolean isAnnotation() {

        return Ann.class.isAnnotation();

    }

    @Compare public boolean isNotAnnotation() {

        return String.class.isAnnotation();

    }

    @Compare public boolean isNotAnnotationEnum() {

        return E.class.isAnnotation();

    }

    enum E { A, B };

    @Compare public boolean isEnum() {

        return E.A.getClass().isEnum();

    }

    @Compare public boolean isNotEnum() {

        return "".getClass().isEnum();

    }

    @Compare public String newInstanceFails() {

        try {

            return "success: " + StaticUseSub.class.newInstance();

        } catch (IllegalAccessException ex) {

            return "failure";

        } catch (InstantiationException ex) {

            return "failure";

        }

    }

    @Compare public String paramTypes() throws Exception {

        Method plus = StaticUse.class.getMethod("plus", int.class, Integer.TYPE);

        final Class[] pt = plus.getParameterTypes();

        return pt[0].getName();

    }

    @Compare public String paramTypesNotFound() throws Exception {

        return StaticUse.class.getMethod("plus", int.class, double.class).toString();

    }

    @Compare public int methodWithArgs() throws Exception {

        Method plus = StaticUse.class.getMethod("plus", int.class, Integer.TYPE);

        return (Integer)plus.invoke(null, 2, 3);

    }

    @Compare public String classGetNameForByte() {

         return byte.class.getName();

    }

    @Compare public String classGetNameForBaseObject() {

        return newObject().getClass().getName();

    }

    @Compare public String classGetNameForJavaObject() {

        return new Object().getClass().getName();

    }

    @Compare public String classGetNameForObjectArray() {

        return (new Object[3]).getClass().getName();

    }

    @Compare public String classGetNameForSimpleIntArray() {

        return (new int[3]).getClass().getName();

    }

    @Compare public boolean sameClassGetNameForSimpleCharArray() {

        return (new char[3]).getClass() == (new char[34]).getClass();

    }

    @Compare public String classGetNameForMultiIntArray() {

        return (new int[3][4][5][6][7][8][9]).getClass().getName();

    }

    @Compare public String classGetNameForMultiIntArrayInner() {

        final int[][][][][][][] arr = new int[3][4][5][6][7][8][9];

        int[][][][][][] subarr = arr[0];

        int[][][][][] subsubarr = subarr[0];

        return subsubarr.getClass().getName();

    }

    @Compare public String classGetNameForMultiStringArray() {

        return (new String[3][4][5][6][7][8][9]).getClass().getName();

    }

    @Compare public String classForByte() throws Exception {

        return Class.forName("[Z").getName();

    }

    @Compare public String classForUnknownArray() {

        try {

            return Class.forName("[W").getName();

        } catch (Exception ex) {

            return ex.getClass().getName();

        }

    }

    @Compare public String classForUnknownDeepArray() {

        try {

            return Class.forName("[[[[[W").getName();

        } catch (Exception ex) {

            return ex.getClass().getName();

        }

    }

    @Compare public int callAbst() throws Exception {

        class Impl extends Abst {

            @Override

            public int abst() {

                return 10;

            }

        }

        Abst impl = new Impl();

        return (int) Abst.class.getMethod("abst").invoke(impl);

    }

    @Compare public String componentGetNameForObjectArray() {

        return (new Object[3]).getClass().getComponentType().getName();

    }

    @Compare public boolean sameComponentGetNameForObjectArray() {

        return (new Object[3]).getClass().getComponentType() == Object.class;

    }

    @Compare public String componentGetNameForSimpleIntArray() {

        return (new int[3]).getClass().getComponentType().getName();

    }

    @Compare public String componentGetNameForMultiIntArray() {

        return (new int[3][4][5][6][7][8][9]).getClass().getComponentType().getName();

    }

    @Compare public String componentGetNameForMultiStringArray() {

        Class<?> c = (new String[3][4][5][6][7][8][9]).getClass();

        StringBuilder sb = new StringBuilder();

        for (;;) {

            sb.append(c.getName()).append("\n");

            c = c.getComponentType();

            if (c == null) {

                break;

            }

        }

        return sb.toString();

    }

    @Compare public boolean isArray() {

        return new Object[0].getClass().isArray();

    }

    @Compare public String copyDataViaReflection() throws Exception {

        Data d = new Data();

        d.setName("Hello world!");

        Method getter = d.getClass().getMethod("getName");

        Object val = getter.invoke(d);

        Data clone = new Data();

        Method setter = d.getClass().getMethod("setName", String.class);

        setter.invoke(clone, val);

        return clone.getName();

    }

    @Compare public String copyStaticDataViaReflection() throws Exception {

        Data.setStatic("Hello world!");

        Method getter = Data.class.getMethod("getStatic");

        Object val = getter.invoke(null);

        Method setter = Data.class.getMethod("setStatic", String.class);

        setter.invoke(null, val);

        return Data.getStatic();

    }

    @JavaScriptBody(args = { "arr", "len" }, body="var a = arr.slice(0, len); a.sort(); return a;")

    private static String[] sort(String[] arr, int len) {

        List<String> list = Arrays.asList(arr).subList(0, len);

        Collections.sort(list);

        return list.toArray(new String[0]);

    }

    @JavaScriptBody(args = {}, body = "return new Object();")

    private static Object newObject() {

        return new Object();

    }

    @Factory

    public static Object[] create() {

        return VMTest.create(ReflectionTest.class);

    }

    public static abstract class Abst {

        public abstract int abst();

    }

    public static final class Data {

        private String name;

        private static String nameStatic;

        public String getName() {

            return name;

        }

        public void setName(String name) {

            this.name = name;

        }

        public static String getStatic() {

            return nameStatic;

        }

        public static void setStatic(String n) {

            nameStatic = n;

        }

    }

}