/*
 * Copyright 2014 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package com.google.gwt.core.client.impl;

import static junit.framework.Assert.fail;

import com.google.gwt.core.client.JavaScriptObject;

/**
 * Example stack traces from various browsers.
 * <p>
 * Some samples are adapted from
 * https://github.com/stacktracejs/stacktrace.js/blob/master/test/CapturedExceptions.js and also
 * used {@link StackTraceGenerator} to add some GWT specific scenarios not covered before.
 */
public class StackTraceExamples {

  public static final Object JAVA = new Object();
  public static final Object RECURSION = new Object();
  public static final Object TYPE_ERROR = new Object();

  private static final Object NO_THROW = new Object();
  private static final int NO_OF_RECURSION = 3;

  public static Exception getLiveException(Object whatToThrow) {
    try {
      throwException1(whatToThrow);
      fail("No exception thrown");
      return null; // shouldn't happen
    } catch (Exception e) {
      if (e.getStackTrace().length == 0) {
        e.fillInStackTrace();
      }
      return e;
    }
  }

  private static void throwException1(Object whatToThrow) throws Exception {
    throwException2(whatToThrow);
  }

  private static void throwException2(Object whatToThrow) throws Exception {
    if (whatToThrow == JAVA) {
      throw new Exception("broken");
    } else if (whatToThrow == RECURSION) {
      throwRecursive(NO_OF_RECURSION);
    } else {
      throwJse(whatToThrow);
    }
  }

  private static void throwRecursive(int count) throws Exception {
    if (count > 1) {
      throwRecursive(count - 1);
    } else {
      throwException1(JAVA);
    }
  }

  public static String[] getNativeMethodNames() {
    return throwJse(NO_THROW);
  }

  private static native String[] throwJse(Object whatToThrow) /*-{
    function native1() {
      return native2();
    }
    function native2() {
      if (whatToThrow == @StackTraceExamples::TYPE_ERROR) {
        null.a();
      }

      if (whatToThrow != @StackTraceExamples::NO_THROW) {
        throw whatToThrow;
      }

      return [
        @StackTraceExamples::getFunctionName(*)(arguments.callee),
        @StackTraceExamples::getFunctionName(*)(arguments.callee.caller),
      ];
    }
    return native1();
  }-*/;

  private static native String getFunctionName(JavaScriptObject fn) /*-{
    return fn.name || (fn.name = @StackTraceExamples::extractFunctionName(*)(fn.toString()));
  }-*/;

  // Visible for testing
  static native String extractFunctionName(String fnName) /*-{
    var fnRE = /function(?:\s+([\w$]+))?\s*\(/;
    var match = fnRE.exec(fnName);
    return (match && match[1]) || "anonymous";
  }-*/;

  // Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.22 (KHTML, like Gecko)
  // Chrome/25.0.1364.97 Safari/537.22
  // Modified to test 'xxx [as yyy]' and 'xxx.yyy' scenarios
  public static native JavaScriptObject chrome_25() /*-{
    return {
        message: "Cannot read property 'length' of undefined",
        name: "TypeError",
        stack: "TypeError: Cannot read property 'length' of undefined\n" +
            "    at C.$third [as alt2](http://www.example.com/test/ABCD.cache.js:300:10)\n" +
            "    at B.$second (http://www.example.com/test/ABCD.cache.js:200:10)\n" +
            "    at $first [as alt1] (http://www.example.com/test/ABCD.cache.js:100:10)\n" +
            "    at $entry0 (http://www.example.com/test/ABCD.cache.js:50:10)"
    };
  }-*/;

  public static native JavaScriptObject chrome_31_multiline() /*-{
    return {
      message: "Object function () {\n" +
          "                return {\n" +
          "                    name: \"provide multi-line source in exception\"\n" +
          "                };\n" +
          "            } has no method 'nonExistentMethod'",
      name: "TypeError",
      stack: "TypeError: Object function () {\n" +
          "                return {\n" +
          "                    name: \"provide multi-line source in exception\"\n" +
          "                };\n" +
          "            } has no method 'nonExistentMethod'\n" +
          "    at dumpException6 (http://www.example.com/test/ABCD.cache.js:82:20)\n" +
          "    at HTMLButtonElement.onclick (http://www.example.com/test/ABCD.cache.js:101:122)",
      toString: function() { return this.name + ": " + this.message; },
    };
  }-*/;

  public static native JavaScriptObject chrome_31_file() /*-{
    return {
      message: "N/A",
      name: "TypeError",
      stack: "TypeError: N/A\n" +
          "    at dumpException6 (file:///E:/test/ExceptionLab.html:82:20)\n" +
          "    at HTMLButtonElement.onclick (file:///E:/test/ExceptionLab.html:101:122)"
    };
  }-*/;

  public static native JavaScriptObject android_gingerbread() /*-{
    return {
        message: "Cannot read property 'length' of undefined",
        stack: "TypeError: Cannot read property 'length' of undefined\n" +
            "    at [object Object].Kj [as Ac] (http://www.example.com/test/ABCD.cache.js:300:9)\n" +
            "    at $third (http://www.example.com/test/ABCD.cache.js:300:10)\n" +
            "    at $second (http://www.example.com/test/ABCD.cache.js:200:10)\n" +
            "    at $first (http://www.example.com/test/ABCD.cache.js:100:10)\n" +
            "    at $entry0 (http://www.example.com/test/ABCD.cache.js:50:10)\n" +
            "    at http://www.example.com/test/ABCD.cache.js:40:10"
    };
  }-*/;

  public static native JavaScriptObject safari_6() /*-{
    return {
      message: "'null' is not an object (evaluating 'x.undef')",
      stack: "@http://www.example.com/test/ABCD.cache.js:48\n" +
          "dumpException3@http://www.example.com/test/ABCD.cache.js:52\n" +
          "onclick@http://www.example.com/test/ABCD.cache.js:82\n" +
          "[native code]",
      line: 48,
      sourceURL: "file:///Users/eric/src/javascript-stacktrace/test/functional/ExceptionLab.html"
    };
  }-*/;

  // Mozilla/5.0 (iPad; CPU OS 6_1 like Mac OS X) AppleWebKit/536.26 (KHTML, like Gecko)
  // Version/6.0 Mobile/10B141 Safari/8536.25
  public static native JavaScriptObject safari_6_ios() /*-{
    return {
        message: "Cannot read property 'length' of undefined",
        name: "TypeError",
        stack: "$third@http://www.example.com/test/ABCD.cache.js:300\n" +
            "$second@http://www.example.com/test/ABCD.cache.js:200\n" +
            "$first@http://www.example.com/test/ABCD.cache.js:100\n" +
            "$entry0@http://www.example.com/test/ABCD.cache.js:50\n" +
            "@http://www.example.com/test/ABCD.cache.js:10\n" +
            "@http://www.example.com/test/ABCD.cache.js:5\n" +
            "[native code]"
    };
  }-*/;

  public static native JavaScriptObject firefox_3_6() /*-{
    return {
      fileName: "http://www.example.com/test/ABCD.cache.js",
      lineNumber: 44,
      message: "this.undef is not a function",
      name: "TypeError",
      stack: "()@http://www.example.com/test/ABCD.cache.js:44\n" +
          "(null)@http://www.example.com/test/ABCD.cache.js:31\n" +
          "printStackTrace()@http://www.example.com/test/ABCD.cache.js:18\n" +
          "bar(1)@http://www.example.com/test/ABCD.cache.js:13\n" +
          "bar([object Object])@http://www.example.com/test/ABCD.cache.js:16\n" +
          "foo()@http://www.example.com/test/ABCD.cache.js:20\n" +
          "@http://www.example.com/test/ABCD.cache.js:24\n" +
          "([object Object])@http://www.example.com/test/ABCD.cache.js:26\n" +
          ""
    };
  }-*/;

  public static native JavaScriptObject firefox_22() /*-{
    return {
      message: "x is null",
      name: "TypeError",
      stack: "@http://www.example.com/test/ABCD.cache.js:4\n" +
          "createException@http://www.example.com/test/ABCD.cache.js:8\n" +
          "createException4@http://www.example.com/test/ABCD.cache.js:56\n" +
          "dumpException4@http://www.example.com/test/ABCD.cache.js:60\n" +
          "Ul/<[\"a.b\"].xyz@http://www.example.com/test/ABCD.cache.js:7\n" +
          "onclick@http://www.example.com/test/ABCD.cache.js:1\n" +
          "",
      fileName: "http://www.example.com/test/ABCD.cache.js",
      lineNumber: 4,
      columnNumber: 6
    };
  }-*/;

  public static native JavaScriptObject ie_10() /*-{
    return {
      message: "Unable to get property 'undef' of undefined or null reference",
      name: "TypeError",
      stack: "TypeError: Unable to get property 'undef' of undefined or null reference\n" +
          "   at Anonymous function (http://www.example.com/test/ABCD.cache.js:48:13)\n" +
          "   at dumpException3 (http://www.example.com/test/ABCD.cache.js:46:9)\n" +
          "   at onclick (http://www.example.com/test/ABCD.cache.js:82:1)",
      description: "Unable to get property 'undef' of undefined or null reference",
      number: -2146823281
    };
  }-*/;
}