/*
 * Copyright (c) 1997, 2023 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0, which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * This Source Code may also be made available under the following Secondary
 * Licenses when the conditions for such availability set forth in the
 * Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
 * version 2 with the GNU Classpath Exception, which is available at
 * https://www.gnu.org/software/classpath/license.html.
 *
 * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
 */

package jakarta.mail.internet;

import org.junit.Assert;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;
import org.junit.runners.Parameterized.Parameters;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

/**
 * Test InternetAddress folding.
 *
 * @author Bill Shannon
 */

@RunWith(Parameterized.class)
public class InternetAddressFoldTest {
    private InternetAddress[] orig;
    private String expect;

    private static List<Object[]> testData;

    public InternetAddressFoldTest(InternetAddress[] orig, String expect) {
        this.orig = orig;
        this.expect = expect;
    }

    @Parameters
    public static Collection<Object[]> data() throws Exception {
        testData = new ArrayList<>();
        parse(new BufferedReader(new InputStreamReader(
                InternetAddressFoldTest.class.getResourceAsStream("addrfolddata"))));
        return testData;
    }

    /**
     * Read the data from the test file.  Format is:
     *
     * FOLD N
     * address1$
     * ...
     * addressN$
     * EXPECT
     * address1, ..., addressN$
     */
    private static void parse(BufferedReader in) throws Exception {
        String line;
        while ((line = in.readLine()) != null) {
            if (line.startsWith("#") || line.length() == 0)
                continue;
            if (!line.startsWith("FOLD"))
                throw new IOException("TEST DATA FORMAT ERROR, MISSING FOLD");
            int count = Integer.parseInt(line.substring(5));
            InternetAddress[] orig = new InternetAddress[count];
            for (int i = 0; i < count; i++)
                orig[i] = new InternetAddress(readString(in));
            String e = in.readLine();
            if (!e.equals("EXPECT"))
                throw new IOException("TEST DATA FORMAT ERROR, MISSING EXPECT");
            String expect = readString(in);
            testData.add(new Object[]{orig, expect});
        }
    }

    /**
     * Read a string that ends with '$', preserving all characters,
     * especially including CR and LF.
     */
    private static String readString(BufferedReader in) throws IOException {
        StringBuffer sb = new StringBuffer();
        int c;
        while ((c = in.read()) != '$')
            sb.append((char) c);
        in.readLine();    // throw away rest of line
        return sb.toString();
    }

    @Test
    public void testFold() {
        Assert.assertEquals("Fold", expect, InternetAddress.toString(orig, 0));
    }
}
