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package org.netbeans.html.boot.impl;

import java.io.Closeable;

import java.lang.reflect.InvocationTargetException;

import java.lang.reflect.Method;

import java.lang.reflect.Modifier;

import org.apidesign.html.boot.spi.Fn;

import static org.testng.Assert.*;

import org.testng.annotations.BeforeMethod;

import org.testng.annotations.Test;

/**

 *

 * @author Jaroslav Tulach <jaroslav.tulach@apidesign.org>

 */

public class JsClassLoaderBase {

    protected static Class<?> methodClass;

    public JsClassLoaderBase() {

    }

    @BeforeMethod

    public void assertClassDefined() {

        assertNotNull(methodClass, "BeforeClass set up code should provide methodClass");

    }

    @Test public void noParamMethod() throws Throwable {

        Method plus = methodClass.getMethod("fortyTwo");

        try {

            final Object val = plus.invoke(null);

            assertTrue(val instanceof Number, "A number returned " + val);

            assertEquals(((Number)val).intValue(), 42);

        } catch (InvocationTargetException ex) {

            throw ex.getTargetException();

        }

    }

    @Test public void testExecuteScript() throws Throwable {

        Method plus = methodClass.getMethod("plus", int.class, int.class);

        try {

            assertEquals(plus.invoke(null, 10, 20), 30);

        } catch (InvocationTargetException ex) {

            throw ex.getTargetException();

        }

    }

    @Test public void overloadedMethod() throws Throwable {

        Method plus = methodClass.getMethod("plus", int.class);

        try {

            assertEquals(plus.invoke(null, 10), 10);

        } catch (InvocationTargetException ex) {

            throw ex.getTargetException();

        }

    }

    @Test public void instanceMethod() throws Throwable {

        Method plus = methodClass.getMethod("plusInst", int.class);

        Object inst = methodClass.newInstance();

        try {

            assertEquals(plus.invoke(inst, 10), 10);

        } catch (InvocationTargetException ex) {

            throw ex.getTargetException();

        }

    }

    @Test public void staticThis() throws Throwable {

        Method st = methodClass.getMethod("staticThis");

        try {

            assertNull(st.invoke(null));

        } catch (InvocationTargetException ex) {

            throw ex.getTargetException();

        }

    }

    @Test public void getThis() throws Throwable {

        Object th = methodClass.newInstance();

        Method st = methodClass.getMethod("getThis");

        try {

            assertEquals(st.invoke(th), th);

        } catch (InvocationTargetException ex) {

            throw ex.getTargetException();

        }

    }

    @Test public void truth() throws Throwable {

        Method st = methodClass.getMethod("truth");

        assertTrue((st.getModifiers() & Modifier.STATIC) != 0, "Is static");

        assertEquals(st.invoke(null), Boolean.TRUE, "Can return boolean");

    }

    @Test public void callback() throws Throwable {

        class R implements Runnable {

            int cnt;

            @Override

            public void run() {

                cnt++;

            }

        }

        R r = new R();

        Method inc = methodClass.getMethod("callback", Runnable.class);

        inc.invoke(null, r);

        assertEquals(r.cnt, 1, "Callback happened");

    }

    @Test public void sumArray() throws Throwable {

        Method st = methodClass.getMethod("sumArr", int[].class);

        assertEquals(st.invoke(null, new int[] { 1, 2, 3 }), 6, "1+2+3 is six");

    }

    @Test public void javaScriptResource() throws Throwable {

        try {

            Method st = methodClass.getMethod("useExternalMul", int.class, int.class);

            assertEquals(st.invoke(null, 6, 7), 42, "Meaning of JavaScript?");

        } catch (InvocationTargetException ex) {

            throw ex.getTargetException();

        }

    }

    @Test public void callJavaScriptMethodOnOwnClass() throws Throwable {

        try {

            Object thiz = methodClass.newInstance();

            Method st = methodClass.getMethod("returnYourSelf", methodClass);

            assertEquals(st.invoke(null, thiz), thiz, "Returns this");

        } catch (InvocationTargetException ex) {

            throw ex.getTargetException();

        }

    }

    @Test public void callStaticJavaMethod() throws Throwable {

        Method st = methodClass.getMethod("staticCallback", int.class, int.class);

        assertEquals(st.invoke(null, 6, 7), 42, "Meaning of JavaScript?");

    }

    @Test public void callStaticStringParamMethod() throws Throwable {

        Method st = methodClass.getMethod("parseInt", String.class);

        assertEquals(st.invoke(null, "42"), 42, "Meaning of JavaScript?");

    }

    @Test public void firstLong() throws Throwable {

        Method st = methodClass.getMethod("chooseLong", boolean.class, boolean.class, long.class, long.class);

        assertEquals(st.invoke(null, true, false, 10, 20), 10L, "Take first value");

    }

    @Test public void secondLong() throws Throwable {

        Method st = methodClass.getMethod("chooseLong", boolean.class, boolean.class, long.class, long.class);

        assertEquals(st.invoke(null, false, true, 10, 20), 20L, "Take 2nd value");

    }

    @Test public void bothLong() throws Throwable {

        Method st = methodClass.getMethod("chooseLong", boolean.class, boolean.class, long.class, long.class);

        assertEquals(st.invoke(null, true, true, 10, 20), 30L, "Take both values");

    }

    @Test public void recordError() throws Throwable {

        Method st = methodClass.getMethod("recordError", Object.class);

        assertEquals(st.invoke(methodClass.newInstance(), "Hello"), "Hello", "The same parameter returned");

    }

    @Test public void plusOrMul() throws Throwable {

        Method st = methodClass.getMethod("plusOrMul", int.class, int.class);

        assertNotNull(Fn.activePresenter(), "Is there a presenter?");

        Closeable c = Fn.activate(null);

        try {

            assertNull(Fn.activePresenter(), "No presenter now");

            assertEquals(st.invoke(null, 6, 7), 42, "Mul in Java");

        } finally {

            c.close();

        }

        assertNotNull(Fn.activePresenter(), "Is there a presenter again");

        assertEquals(st.invoke(null, 6, 7), 13, "Plus in JavaScript");

        c = Fn.activate(null);

        try {

            assertNull(Fn.activePresenter(), "No presenter again");

            assertEquals(st.invoke(null, 6, 7), 42, "Mul in Java");

        } finally {

            c.close();

        }

        assertNotNull(Fn.activePresenter(), "Is there a presenter again");

        assertEquals(st.invoke(null, 6, 7), 13, "Plus in JavaScript again");

    }

    @Test public void arrayInOut() throws Throwable {

        String[] arr = { "Ahoj" };

        Method st = methodClass.getMethod("arr", Object[].class);

        Object ret = st.invoke(null, (Object) arr);

        assertTrue(ret instanceof Object[], "Expecting array: " + ret);

        Object[] res = (Object[]) ret;

        assertEquals(res.length, 1, "One element");

        assertEquals(res[0], "Ahoj", "The right string");

    }

}