/**

  * Back 2 Browser Bytecode Translator

  * Copyright (C) 2012 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.launcher.impl;

 import java.io.IOException;

 import java.io.InputStream;

 import java.io.UnsupportedEncodingException;

 import java.lang.reflect.InvocationTargetException;

 import java.lang.reflect.Method;

 import java.lang.reflect.Modifier;

 import java.net.URL;

 import java.util.Enumeration;

 import javafx.scene.web.WebEngine;

 import netscape.javascript.JSObject;

 import org.apidesign.bck2brwsr.core.JavaScriptBody;

 /**

  *

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

  */

 public final class Console {

     public Console() {

     }

     private static final JSObject CObject;

     @JavaScriptBody(args = {"elem", "attr"}, body = 

         "return elem[attr].toString();")

     private static Object getAttr(Object elem, String attr) {

         return CObject.call("getAttr", elem, attr);

     }

     @JavaScriptBody(args = {"id", "attr", "value"}, body = 

         "window.document.getElementById(id)[attr] = value;")

     private static void setAttr(String id, String attr, Object value) {

         CObject.call("setAttrId", id, attr, value);

     }

     @JavaScriptBody(args = {"elem", "attr", "value"}, body = 

         "elem[attr] = value;")

     private static void setAttr(Object id, String attr, Object value) {

         CObject.call("setAttr", id, attr, value);

     }

     @JavaScriptBody(args = {}, body = "return; window.close();")

     private static void closeWindow() {}

     private static Object textArea;

     private static Object statusArea;

     private static void log(String newText) {

         if (textArea == null) {

             return;

         }

         String attr = "value";

         setAttr(textArea, attr, getAttr(textArea, attr) + "\n" + newText);

         setAttr(textArea, "scrollTop", getAttr(textArea, "scrollHeight"));

     }

     private static void beginTest(Case c) {

         Object[] arr = new Object[2];

         beginTest(c.getClassName() + "." + c.getMethodName(), c, arr);

         textArea = arr[0];

         statusArea = arr[1];

     }

     private static void finishTest(Case c, Object res) {

         if ("null".equals(res)) {

             setAttr(statusArea, "innerHTML", "Success");

         } else {

             setAttr(statusArea, "innerHTML", "Result " + res);

         }

         statusArea = null;

         textArea = null;

     }

     private static final String BEGIN_TEST =  

         "var ul = window.document.getElementById('bck2brwsr.result');\n"

         + "var li = window.document.createElement('li');\n"

         + "var span = window.document.createElement('span');"

         + "span.innerHTML = test + ' - ';\n"

         + "var details = window.document.createElement('a');\n"

         + "details.innerHTML = 'Details';\n"

         + "details.href = '#';\n"

         + "var p = window.document.createElement('p');\n"

         + "var status = window.document.createElement('a');\n"

         + "status.innerHTML = 'running';"

         + "details.onclick = function() { li.appendChild(p); li.removeChild(details); status.innerHTML = 'Run Again'; status.href = '#'; };\n"

         + "status.onclick = function() { c.again__V_3Ljava_lang_Object_2(arr); }\n"

         + "var pre = window.document.createElement('textarea');\n"

         + "pre.cols = 100;"

         + "pre.rows = 10;"

         + "li.appendChild(span);\n"

         + "li.appendChild(status);\n"

         + "var span = window.document.createElement('span');"

         + "span.innerHTML = ' ';\n"

         + "li.appendChild(span);\n"

         + "li.appendChild(details);\n"

         + "p.appendChild(pre);\n"

         + "ul.appendChild(li);\n"

         + "arr[0] = pre;\n"

         + "arr[1] = status;\n";

     @JavaScriptBody(args = { "test", "c", "arr" }, body = BEGIN_TEST)

     private static void beginTest(String test, Case c, Object[] arr) {

         CObject.call("beginTest", test, c, arr);

     }

     private static final String LOAD_TEXT = 

           "var request = new XMLHttpRequest();\n"

         + "request.open('GET', url, true);\n"

         + "request.setRequestHeader('Content-Type', 'text/plain; charset=utf-8');\n"

         + "request.onreadystatechange = function() {\n"

         + "  if (this.readyState!==4) return;\n"

         + " try {"

         + "  arr[0] = this.responseText;\n"

         + "  callback.run();\n"

         + " } catch (e) { alert(e); }"

         + "};"

         + "request.send();";

     @JavaScriptBody(args = { "url", "callback", "arr" }, body = LOAD_TEXT)

     private static void loadText(String url, Runnable callback, String[] arr) throws IOException {

         CObject.call("loadText", url, new Run(callback), arr);

     }

     public void harness(String url) throws IOException {

         log("Connecting to " + url);

         Request r = new Request(url);

     }

     private static class Request implements Runnable {

         private final String[] arr = { null };

         private final String url;

         private Case c;

         private int retries;

         private Request(String url) throws IOException {

             this.url = url;

             loadText(url, this, arr);

         }

         private Request(String url, String u) throws IOException {

             this.url = url;

             loadText(u, this, arr);

         }

         @Override

         public void run() {

             try {

                 if (c == null) {

                     String data = arr[0];

                     if (data == null) {

                         log("Some error exiting");

                         closeWindow();

                         return;

                     }

                     if (data.isEmpty()) {

                         log("No data, exiting");

                         closeWindow();

                         return;

                     }

                     c = Case.parseData(data);

                     beginTest(c);

                     log("Got \"" + data + "\"");

                 } else {

                     log("Processing \"" + arr[0] + "\" for " + retries + " time");

                 }

                 Object result = retries++ >= 10 ? "java.lang.InterruptedException:timeout" : c.runTest();

                 finishTest(c, result);

                 String u = url + "?request=" + c.getRequestId() + "&result=" + result;

                 new Request(url, u);

             } catch (Exception ex) {

                 if (ex instanceof InterruptedException) {

                     log("Re-scheduling in 100ms");

                     schedule(this, 100);

                     return;

                 }

                 log(ex.getClass().getName() + ":" + ex.getMessage());

             }

         }

     }

     private static String encodeURL(String r) throws UnsupportedEncodingException {

         final String SPECIAL = "%$&+,/:;=?@";

         StringBuilder sb = new StringBuilder();

         byte[] utf8 = r.getBytes("UTF-8");

         for (int i = 0; i < utf8.length; i++) {

             int ch = utf8[i] & 0xff;

             if (ch < 32 || ch > 127 || SPECIAL.indexOf(ch) >= 0) {

                 final String numbers = "0" + Integer.toHexString(ch);

                 sb.append("%").append(numbers.substring(numbers.length() - 2));

             } else {

                 if (ch == 32) {

                     sb.append("+");

                 } else {

                     sb.append((char)ch);

                 }

             }

         }

         return sb.toString();

     }

     static String invoke(String clazz, String method) throws 

     ClassNotFoundException, InvocationTargetException, IllegalAccessException, 

     InstantiationException, InterruptedException {

         final Object r = new Case(null).invokeMethod(clazz, method);

         return r == null ? "null" : r.toString().toString();

     }

     /** Helper method that inspects the classpath and loads given resource

      * (usually a class file). Used while running tests in Rhino.

      * 

      * @param name resource name to find

      * @return the array of bytes in the given resource

      * @throws IOException I/O in case something goes wrong

      */

     public static byte[] read(String name) throws IOException {

         URL u = null;

         Enumeration<URL> en = Console.class.getClassLoader().getResources(name);

         while (en.hasMoreElements()) {

             u = en.nextElement();

         }

         if (u == null) {

             throw new IOException("Can't find " + name);

         }

         try (InputStream is = u.openStream()) {

             byte[] arr;

             arr = new byte[is.available()];

             int offset = 0;

             while (offset < arr.length) {

                 int len = is.read(arr, offset, arr.length - offset);

                 if (len == -1) {

                     throw new IOException("Can't read " + name);

                 }

                 offset += len;

             }

             return arr;

         }

     }

     @JavaScriptBody(args = {}, body = "vm.desiredAssertionStatus = true;")

     private static void turnAssetionStatusOn() {

     }

     @JavaScriptBody(args = {"r", "time"}, body =

         "return window.setTimeout(function() { r.run__V(); }, time);")

     private static Object schedule(Runnable r, int time) {

         return CObject.call("schedule", new Run(r), time);

     }

     private static final class Case {

         private final Object data;

         private Object inst;

         private Case(Object data) {

             this.data = data;

         }

         public static Case parseData(String s) {

             return new Case(toJSON(s));

         }

         public String getMethodName() {

             return (String) value("methodName", data);

         }

         public String getClassName() {

             return (String) value("className", data);

         }

         public int getRequestId() {

             return (int) value("request", data);

         }

         public String getHtmlFragment() {

             return (String) value("html", data);

         }

         void again(Object[] arr) {

             try {

                 textArea = arr[0];

                 statusArea = arr[1];

                 setAttr(textArea, "value", "");

                 runTest();

             } catch (Exception ex) {

                 log(ex.getClass().getName() + ":" + ex.getMessage());

             }

         }

         private Object runTest() throws IllegalAccessException, 

         IllegalArgumentException, ClassNotFoundException, UnsupportedEncodingException, 

         InvocationTargetException, InstantiationException, InterruptedException {

             if (this.getHtmlFragment() != null) {

                 setAttr("bck2brwsr.fragment", "innerHTML", this.getHtmlFragment());

             }

             log("Invoking " + this.getClassName() + '.' + this.getMethodName() + " as request: " + this.getRequestId());

             Object result = invokeMethod(this.getClassName(), this.getMethodName());

             setAttr("bck2brwsr.fragment", "innerHTML", "");

             log("Result: " + result);

             result = encodeURL("" + result);

             log("Sending back: ...?request=" + this.getRequestId() + "&result=" + result);

             return result;

         }

         private Object invokeMethod(String clazz, String method)

         throws ClassNotFoundException, InvocationTargetException,

         InterruptedException, IllegalAccessException, IllegalArgumentException,

         InstantiationException {

             Method found = null;

             Class<?> c = Class.forName(clazz);

             for (Method m : c.getMethods()) {

                 if (m.getName().equals(method)) {

                     found = m;

                 }

             }

             Object res;

             if (found != null) {

                 try {

                     if ((found.getModifiers() & Modifier.STATIC) != 0) {

                         res = found.invoke(null);

                     } else {

                         if (inst == null) {

                             inst = c.newInstance();

                         }

                         res = found.invoke(inst);

                     }

                 } catch (Throwable ex) {

                     if (ex instanceof InvocationTargetException) {

                         ex = ((InvocationTargetException) ex).getTargetException();

                     }

                     if (ex instanceof InterruptedException) {

                         throw (InterruptedException)ex;

                     }

                     res = ex.getClass().getName() + ":" + ex.getMessage();

                 }

             } else {

                 res = "Can't find method " + method + " in " + clazz;

             }

             return res;

         }

         @JavaScriptBody(args = "s", body = "return eval('(' + s + ')');")

         private static Object toJSON(String s) {

             return CObject.call("toJSON", s);

         }

         @JavaScriptBody(args = {"p", "d"}, body = 

               "var v = d[p];\n"

             + "if (typeof v === 'undefined') return null;\n"

             + "return v.toString();"

         )

         private static Object value(String p, Object d) {

             return ((JSObject)d).getMember(p);

         }

     }

     private static String safe(String txt) {

         return "try {" + txt + "} catch (err) { alert(err); }";

     }

     static {

         turnAssetionStatusOn();

         WebEngine web = (WebEngine) System.getProperties().get("webEngine");

         CObject = (JSObject) web.executeScript("(function() {"

             + "var CObject = {};"

             + "CObject.getAttr = function(elem, attr) { return elem[attr].toString(); };"

             + "CObject.setAttrId = function(id, attr, value) { window.document.getElementById(id)[attr] = value; };"

             + "CObject.setAttr = function(elem, attr, value) { elem[attr] = value; };"

             + "CObject.beginTest = function(test, c, arr) {" + safe(BEGIN_TEST) + "};"

             + "CObject.loadText = function(url, callback, arr) {" + safe(LOAD_TEXT) + "};"

             + "CObject.schedule = function(r, time) { return window.setTimeout(function() { r.run(); }, time); };"

             + "CObject.toJSON = function(s) { return eval('(' + s + ')'); };"

             + "return CObject;"

         + "})(this)");

     }

 }