/*
 * Copyright (c) 1997, 2020 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 java.io.*;
import java.util.*;
import jakarta.mail.*;
import jakarta.mail.internet.HeaderTokenizer;
import jakarta.mail.internet.ParseException;

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

/**
 * Test MIME HeaderTokenizer.
 *
 * @author Bill Shannon
 */

@RunWith(Parameterized.class)
public class HeaderTokenizerTest {
    private String header;
    private String value;
    private String[] expect;

    static boolean gen_test_input = false;	// output good for input to -p
    static boolean parse_mail = false;		// parse input in mail format
    static boolean return_comments = false;	// return comments as tokens
    static boolean mime = false;		// use MIME specials
    static int errors = 0;			// number of errors detected

    static boolean junit;
    static List<Object[]> testData;

    public HeaderTokenizerTest(String heder, String value, String[] expect) {
	this.header = header;
	this.value = value;
	this.expect = expect;
    }

    @Parameters
    public static Collection<Object[]> data() throws IOException {
	junit = true;
	testData = new ArrayList<>();
	parse(new BufferedReader(new InputStreamReader(
	    InternetAddressTest.class.getResourceAsStream("tokenlist"))));
	return testData;
    }

    @Test
    public void test() {
	test(header, value, expect);
    }

    public static void main(String argv[]) throws Exception {
	int optind;
	for (optind = 0; optind < argv.length; optind++) {
	    if (argv[optind].equals("-")) {
		// ignore
	    } else if (argv[optind].equals("-g")) {
		gen_test_input = true;
	    } else if (argv[optind].equals("-p")) {
		parse_mail = true;
	    } else if (argv[optind].equals("-c")) {
		return_comments = true;
	    } else if (argv[optind].equals("-m")) {
		mime = true;
	    } else if (argv[optind].equals("--")) {
		optind++;
		break;
	    } else if (argv[optind].startsWith("-")) {
		System.out.println(
		    "Usage: tokenizertest [-g] [-p] [-c] [-m] [-] [header ...]");
		System.exit(1);
	    } else {
		break;
	    }
	}

	/*
	 * If there's any args left on the command line,
	 * concatenate them into a string and test that.
	 */
	if (optind < argv.length) {
	    StringBuffer sb = new StringBuffer();
	    for (int i = optind; i < argv.length; i++) {
		sb.append(argv[i]);
		sb.append(" ");
	    }
	    test("To", sb.toString(), null);
	} else {
	    // read from stdin
	    BufferedReader in =
		new BufferedReader(new InputStreamReader(System.in));
	    String s;

	    if (parse_mail)
		parse(in);
	    else {
		while ((s = in.readLine()) != null)
		    test("To", s, null);
	    }
	}
	System.exit(errors);

    }

    /*
     * Parse the input in "mail" format, extracting the From, To, and Cc
     * headers and testing them.  The parse is rather crude, but sufficient
     * to test against most existing UNIX mailboxes.
     */
    public static void parse(BufferedReader in) throws IOException {
	String header = "";

	for (;;) {
	    String s = in.readLine();
	    if (s != null && s.length() > 0) {
		char c = s.charAt(0);
		if (c == ' ' || c == '\t') {
		    // a continuation line, add it to the current header
		    header += '\n' + s;
		    continue;
		}
	    }
	    // "s" is the next header, "header" is the last complete header
	    if (header.startsWith("From: ") ||
		    header.startsWith("To: ") ||
		    header.startsWith("Cc: ")) {
		int i;
		String[] expect = null;
		if (s != null && s.startsWith("Expect: ")) {
		    try {
			int nexpect = Integer.parseInt(s.substring(8));
			expect = new String[nexpect];
			for (i = 0; i < nexpect; i++)
			    expect[i] = in.readLine().trim();
		    } catch (NumberFormatException e) {
			try {
			    if (s.substring(8, 17).equals("Exception")) {
				expect = new String[1];
				expect[0] = "Exception";
			    }
			} catch (StringIndexOutOfBoundsException se) {
			    // ignore it
			}
		    }
		}
		i = header.indexOf(':');
		try {
		    if (junit)
			testData.add(new Object[] {
			    header.substring(0, i),
			    header.substring(i + 2),
			    expect });
		    else
			test(header.substring(0, i), header.substring(i + 2),
			    expect);
		} catch (StringIndexOutOfBoundsException e) {
		    // ignore
		}
	    }
	    if (s == null)
		return;		// EOF
	    if (s.length() == 0) {
		while ((s = in.readLine()) != null) {
		    if (s.startsWith("From "))
			break;
		}
		if (s == null)
		    return;
	    }
	    header = s;
	}
    }

    /**
     * Test the header's value to see if we can tokenize it as expected.
     */
    public static void test(String header, String value, String expect[]) {
	PrintStream out = System.out;
	if (gen_test_input)
	    out.println(header + ": " + value);
	else if (!junit)
	    out.println("Test: " + value);

	try {
	    HeaderTokenizer ht = new HeaderTokenizer(value,
			mime ? HeaderTokenizer.MIME : HeaderTokenizer.RFC822,
			!return_comments);
	    HeaderTokenizer.Token tok;
	    Vector<HeaderTokenizer.Token> toklist
		    = new Vector<>();
	    while ((tok = ht.next()).getType() != HeaderTokenizer.Token.EOF)
		toklist.addElement(tok);
	    if (gen_test_input)
		out.println("Expect: " + toklist.size());
	    else {
		if (junit) {
		    Assert.assertEquals("Number of tokens",
			expect.length, toklist.size());
		} else {
		    out.println("Got " + toklist.size() + " tokens:");
		    if (expect != null && toklist.size() != expect.length) {
			out.println("Expected " + expect.length + " tokens");
			errors++;
		    }
		}
	    }
	    for (int i = 0; i < toklist.size(); i++) {
		tok = toklist.elementAt(i);
		if (gen_test_input)
		    out.println("\t" + type(tok.getType()) +
						"\t" + tok.getValue());
		else {
		    if (!junit)
			out.println("\t[" + (i+1) + "] " + type(tok.getType()) +
						"\t" + tok.getValue());
		    if (expect != null && i < expect.length) {
			HeaderTokenizer.Token t = makeToken(expect[i]);
			if (junit) {
			    Assert.assertEquals("Token type",
				t.getType(), tok.getType());
			    Assert.assertEquals("Token value",
				t.getValue(), tok.getValue());
			} else {
			    if (t.getType() != tok.getType() ||
				!t.getValue().equals(tok.getValue())) {
				out.println("\tExpected:\t" +
				    type(t.getType()) + "\t" + t.getValue());
				errors++;
			    }
			}
		    }
		}
	    }
	} catch (ParseException e) {
	    if (gen_test_input)
		out.println("Expect: Exception " + e);
	    else {
		if (junit) {
		    Assert.assertTrue("Expected exception",
			expect.length == 1 && expect[0].equals("Exception"));
		} else {
		    out.println("Got Exception: " + e);
		    if (expect != null &&
		       (expect.length != 1 || !expect[0].equals("Exception"))) {
			out.println("Expected " + expect.length + " tokens");
			for (int i = 0; i < expect.length; i++)
			    out.println("\tExpected:\t" + expect[i]);
			errors++;
		    }
		}
	    }
	}
    }

    private static String type(int t) {
	if (t == HeaderTokenizer.Token.ATOM)
	    return "ATOM";
	else if (t == HeaderTokenizer.Token.QUOTEDSTRING)
	    return "QUOTEDSTRING";
	else if (t == HeaderTokenizer.Token.COMMENT)
	    return "COMMENT";
	else if (t == HeaderTokenizer.Token.EOF)
	    return "EOF";
	else if (t < 0)
	    return "UNKNOWN";
	else
	    return "SPECIAL";
    }

    private static int type(String s) {
	if (s.equals("ATOM"))
	    return HeaderTokenizer.Token.ATOM;
	else if (s.equals("QUOTEDSTRING"))
	    return HeaderTokenizer.Token.QUOTEDSTRING;
	else if (s.equals("COMMENT"))
	    return HeaderTokenizer.Token.COMMENT;
	else if (s.equals("EOF"))
	    return HeaderTokenizer.Token.EOF;
	else // if (s.equals("SPECIAL"))
	    return 0;
    }

    private static HeaderTokenizer.Token makeToken(String line) {
	int i = line.indexOf('\t');
	int t = type(line.substring(0, i));
	String value = line.substring(i + 1);
	if (t == 0)
	    return new HeaderTokenizer.Token(value.charAt(0), value);
	else
	    return new HeaderTokenizer.Token(t, value);
    }

    private static final String n(String s) {
	return s == null ? "<null>" : s;
    }
}
