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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.

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 * The contents of this file are subject to the terms of either the GNU

 * General Public License Version 2 only ("GPL") or the Common

 * Development and Distribution License("CDDL") (collectively, the

 * "License"). You may not use this file except in compliance with the

 * License. You can obtain a copy of the License at

 * http://www.netbeans.org/cddl-gplv2.html

 * or nbbuild/licenses/CDDL-GPL-2-CP. See the License for the

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 * nbbuild/licenses/CDDL-GPL-2-CP.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

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 * accompanied this code. If applicable, add the following below the

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 * The Original Software is NetBeans. The Initial Developer of the Original

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package net.java.html.json.tests;

import java.net.URI;

import java.util.Collections;

import java.util.Map;

import java.util.ServiceLoader;

import net.java.html.BrwsrCtx;

import org.apidesign.html.json.tck.KnockoutTCK;

/**

 *

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

 */

public final class Utils {

    private static KnockoutTCK instantiatedTCK;

    private Utils() {

    }

    public static void registerTCK(KnockoutTCK tck) {

        instantiatedTCK = tck;

    }

    static  BrwsrCtx newContext(Class<?> clazz) {

        for (KnockoutTCK tck : tcks(clazz)) {

            BrwsrCtx c = tck.createContext();

            if (c != null) {

                return c;

            }

        }

        throw new AssertionError("Can't find appropriate Context in ServiceLoader!");

    }

    static Object createObject(Map<String,Object> values, Class<?> clazz) {

        for (KnockoutTCK tck : tcks(clazz)) {

            Object o = tck.createJSON(values);

            if (o != null) {

                return o;

            }

        }

        throw new AssertionError("Can't find appropriate Context in ServiceLoader!");

    }

    static Object executeScript(Class<?> clazz, 

        String script, Object... arguments

    ) throws Exception {

        for (KnockoutTCK tck : tcks(clazz)) {

            return tck.executeScript(script, arguments);

        }

        throw new AssertionError("Can't find appropriate Context in ServiceLoader!");

    }

    private static Iterable<KnockoutTCK> tcks(Class<?> clazz) {

        if (instantiatedTCK != null) {

            return Collections.singleton(instantiatedTCK);

        }

        return ServiceLoader.load(KnockoutTCK.class, cl(clazz));

    }

    static Object exposeHTML(Class<?> clazz, String html) throws Exception {

        String s = 

          "var n = window.document.getElementById('ko.test.div'); \n "

        + "if (!n) { \n"

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

        + "  n.id = 'ko.test.div'; \n "

        + "  var body = window.document.getElementsByTagName('body')[0];\n"

        + "  body.appendChild(n);\n"

        + "}\n"

        + "n.innerHTML = arguments[0]; \n ";

        return executeScript(clazz, s, html);

    }

    static String prepareURL(

        Class<?> clazz, String content, String mimeType, String... parameters) {

        for (KnockoutTCK tck : tcks(clazz)) {

            URI o = tck.prepareURL(content, mimeType, parameters);

            if (o != null) {

                return o.toString();

            }

        }

        throw new IllegalStateException();

    }

    static boolean canFailWebSockets(

        Class<?> clazz) {

        for (KnockoutTCK tck : tcks(clazz)) {

            if (tck.canFailWebSocketTest()) {

                return true;

            }

        }

        return false;

    }

    private static ClassLoader cl(Class<?> c) {

        try {

            return c.getClassLoader();

        } catch (SecurityException ex) {

            return null;

        }

    }

}