/**

 * 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.tck;

import java.io.ByteArrayInputStream;

import java.io.Closeable;

import java.io.IOException;

import java.io.InputStream;

import java.net.URL;

import java.net.URLConnection;

import java.util.Enumeration;

import net.java.html.js.JavaScriptBody;

import org.apidesign.bck2brwsr.vmtest.BrwsrTest;

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 ResourcesTest {

    @Compare public String allManifests() throws Exception {

        Enumeration<URL> en = ClassLoader.getSystemResources("META-INF/MANIFEST.MF");

        assert en.hasMoreElements() : "Should have at least one manifest";

        String first = readString(en.nextElement().openStream());

        boolean different = false;

        int cnt = 1;

        while (en.hasMoreElements()) {

            URL url = en.nextElement();

            String now = readString(url.openStream());

            if (!first.equals(now)) {

                different = true;

            }

            cnt++;

            if (cnt > 500) {

                throw new IllegalStateException(

                    "Giving up. First manifest:\n" + first + 

                    "\nLast manifest:\n" + now

                );

            }

        }

        assert different : "Not all manifests should look like first one:\n" + first;

        if (cnt > 40 && cnt < 50) {

            return "OK";

        } else {

            return "" + cnt;

        }

    }

    @Compare public String readResourceAsStream() throws Exception {

        InputStream is = getClass().getResourceAsStream("Resources.txt");

        return readString(is);

    }

    @Compare public String readResourceViaXMLHttpRequest() throws Exception {

        return readResourceViaXHR("Resources.txt", null);

    }

    @BrwsrTest public void xhrTestedInBrowser() throws Exception {

        boolean[] run = { false };

        readResourceViaXHR("Resources.txt", run);

        assert run[0] : "XHR really used in browser";

    }

    @Compare public String readBinaryResourceViaXMLHttpRequest() throws Exception {

        return readResourceViaXHR("0xfe", null);

    }

    private String readResourceViaXHR(final String res, boolean[] exec) throws IOException {

        URL url = getClass().getResource(res);

        URLConnection conn = url.openConnection();

        String java = readBytes(url.openStream());

        String java2 = readBytes(conn.getInputStream());

        assert java.equals(java2) : "Java:\n" + java + "\nConn:\n" + java2;

        URL url2 = conn.getURL();

        String java3 = readBytes(url.openStream());

        assert java.equals(java3) : "Java:\n" + java + "\nConnURL:\n" + java3;

        byte[] xhr = readXHR(url2.toExternalForm());

        if (xhr != null) {

            if (exec != null) {

                exec[0] = true;

            }

            String s = readBytes(new ByteArrayInputStream(xhr));

            assert java.equals(s) : "Java:\n" + java + "\nXHR:\n" + s;

            assert conn instanceof Closeable : "Can be closed";

            Closeable c = (Closeable) conn;

            c.close();

            byte[] xhr2 = null;

            try {

                xhr2 = readXHR(url2.toExternalForm());

            } catch (Throwable t) {

                // OK, expecting error

            }

            assert xhr2 == null : "Cannot read the URL anymore";

        }

        return java;

    }

    @JavaScriptBody(args = { "url" }, body =

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

        "var xhr = new XMLHttpRequest();\n" +

        "xhr.overrideMimeType('text\\/plain; charset=x-user-defined');\n" +

        "xhr.open('GET', url, false);\n" +

        "xhr.send();\n" +

        "if (xhr.status !== 200) throw 'Status: ' + xhr.status + ' ' + xhr.statusText;\n" +

        "var ret = []\n" +

        "for (var i = 0; i < xhr.responseText.length; i++) {\n" +

        "  var b = xhr.responseText.charCodeAt(i) & 0xff;\n" +

        "  if (b > 127) b -= 256;\n" +

        "  ret.push(b);\n" +

        "}\n" +

        "return ret;\n"

    )

    private static byte[] readXHR(String url) {

        return null;

    }

    @Compare public String readResourceViaConnection() throws Exception {

        final URL url = getClass().getResource("Resources.txt");

        String str = url.toExternalForm();

        int idx = str.indexOf("org/apidesign/bck2brwsr/tck");

        assert idx >= 0 : "Package name found in the URL name: " + str;

        InputStream is = url.openConnection().getInputStream();

        return readString(is);

    }

    private String readString(InputStream is) throws IOException {

        StringBuilder sb = new StringBuilder();

        byte[] b = new byte[512];

        for (;;) { 

            int len = is.read(b);

            if (len == -1) {

                return sb.toString();

            }

            for (int i = 0; i < len; i++) {

                sb.append((char)b[i]);

            }

        }

    }

    private String readBytes(InputStream is) throws IOException {

        StringBuilder sb = new StringBuilder();

        byte[] b = new byte[512];

        for (;;) { 

            int len = is.read(b);

            if (len == -1) {

                return sb.toString();

            }

            for (int i = 0; i < len; i++) {

                sb.append((int)b[i]).append(" ");

            }

        }

    }

    @Compare public String readResourceAsStreamFromClassLoader() throws Exception {

        InputStream is = getClass().getClassLoader().getResourceAsStream("org/apidesign/bck2brwsr/tck/Resources.txt");

        return readString(is);

    }

    @Compare public String toURIFromURL() throws Exception {

        URL u = new URL("http://apidesign.org");

        return u.toURI().toString();

    }

    @Factory public static Object[] create() {

        return VMTest.create(ResourcesTest.class);

    }

}