/*
 * Copyright (C) 2008 The Android Open Source Project
 *
 * 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 android.text.util.cts;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.fail;

import android.text.util.Rfc822Token;
import android.text.util.Rfc822Tokenizer;

import androidx.test.filters.SmallTest;
import androidx.test.runner.AndroidJUnit4;

import org.junit.Test;
import org.junit.runner.RunWith;

import java.util.ArrayList;
import java.util.List;

/**
 * Test {@link Rfc822Tokenizer}.
 */
@SmallTest
@RunWith(AndroidJUnit4.class)
public class Rfc822TokenizerTest {
    @Test
    public void testConstructor() {
        new Rfc822Tokenizer();
    }

    @Test
    public void testFindTokenStart() {
        Rfc822Tokenizer rfc822Tokenizer = new Rfc822Tokenizer();

        String token1 = "John Doe <janed@example.net> (work)";
        String token2 = "Ann Lee <annlee@example.com> (secret)";
        String token3 = "Charles Hanson (work)";
        String token4 = "Lucia Smith <lsmith@example.com>";
        String text = ",   " + token1 + "\",\"" + token2 + ";" + token3 + " <;>" + token4;
        final int TOKEN_START_POS_1 = text.indexOf(token1);
        final int TOKEN_START_POS_2 = text.indexOf(token2);
        final int TOKEN_START_POS_3 = text.indexOf(token3);
        final int TOKEN_START_POS_4 = text.indexOf(token4);
        assertEquals(0, rfc822Tokenizer.findTokenStart(text, 0));
        assertEquals(0, rfc822Tokenizer.findTokenStart(text, TOKEN_START_POS_1));
        assertEquals(TOKEN_START_POS_1, rfc822Tokenizer.findTokenStart(text, TOKEN_START_POS_2));
        // token 2 is ignored because ',' between token1 and token2 is in a pair of \".
        assertEquals(TOKEN_START_POS_1, rfc822Tokenizer.findTokenStart(text, TOKEN_START_POS_3));
        assertEquals(TOKEN_START_POS_3, rfc822Tokenizer.findTokenStart(text, TOKEN_START_POS_4));
        // token 4 is ignored because ',' between token3 and token4 is in <>.
        assertEquals(TOKEN_START_POS_3, rfc822Tokenizer.findTokenStart(text, text.length()));

        assertEquals(0, rfc822Tokenizer.findTokenStart(text, -1));
        assertEquals(TOKEN_START_POS_3, rfc822Tokenizer.findTokenStart(text, text.length() + 1));

        try {
            rfc822Tokenizer.findTokenStart(null, TOKEN_START_POS_1);
            fail("Should throw NullPointerException!");
        } catch (NullPointerException e) {
            // issue 1695243, not clear what is supposed to happen if text is null.
        }
    }

    @Test
    public void testFindTokenEnd() {
        Rfc822Tokenizer rfc822Tokenizer = new Rfc822Tokenizer();

        String token1 = "John Doe <janed@example.net> (work)";
        String text1 = ",   " + token1;
        assertEquals(0, rfc822Tokenizer.findTokenEnd(text1, 0));
        assertEquals(text1.length(), rfc822Tokenizer.findTokenEnd(text1, 1));
        // issue 1695243
        // not clear whether it is supposed result if cursor is exceptional value.
        // bigger than the text length.
        assertEquals(Integer.MAX_VALUE, rfc822Tokenizer.findTokenEnd(text1, Integer.MAX_VALUE));
        // smaller than 0
        try {
            rfc822Tokenizer.findTokenEnd(text1, -1);
            fail("Should throw IndexOutOfBoundsException!");
        } catch (IndexOutOfBoundsException e) {
        }

        String token2 = "Ann Lee <annlee@example.com> (secret)";
        String token3 = "Charles Hanson (work)";
        String token4 = "Lucia Smith <lsmith@example.com>";
        String text2 = token1 + "\",\"" + token2 + ";" + token3 + " <;>" + token4 + ",";
        final int TOKEN_END_POS_2 = text2.indexOf(token2) + token2.length();
        final int TOKEN_END_POS_4 = text2.indexOf(token4) + token4.length();
        assertEquals(TOKEN_END_POS_2, rfc822Tokenizer.findTokenEnd(text2, 0));
        assertEquals(TOKEN_END_POS_4, rfc822Tokenizer.findTokenEnd(text2, TOKEN_END_POS_2 + 1));
    }

    @Test(expected=NullPointerException.class)
    public void testFindTokenEndNull() {
        Rfc822Tokenizer rfc822Tokenizer = new Rfc822Tokenizer();

        rfc822Tokenizer.findTokenEnd(null, 0);
    }

    @Test
    public void testTerminateToken() {
        Rfc822Tokenizer rfc822Tokenizer = new Rfc822Tokenizer();

        String comma = ",";
        String space = " ";

        String text = "text";
        assertEquals(text + comma + space, rfc822Tokenizer.terminateToken(text));

        text = null;
        // issue 1695243, not clear what is supposed result if text is null.
        assertEquals(text + comma + space, rfc822Tokenizer.terminateToken(null));
    }

    @Test
    public void testTokenize() {
        Rfc822Token[] tokens = Rfc822Tokenizer.tokenize("");
        assertEquals(0, tokens.length);

        String text = "\"Berg\" (home) <berg\\@example.com>, tom\\@example.com (work)";
        tokens = Rfc822Tokenizer.tokenize(text);
        assertEquals(2, tokens.length);
        verifyLocalAssertEquals(tokens[0], "Berg", "berg\\@example.com", "home");
        verifyLocalAssertEquals(tokens[1], null, "tom\\@example.com", "work");

        text = "Foo Bar (something) <foo\\@example.com>, blah\\@example.com (something)";
        tokens = Rfc822Tokenizer.tokenize(text);
        assertEquals(2, tokens.length);
        verifyLocalAssertEquals(tokens[0], "Foo Bar", "foo\\@example.com", "something");
        verifyLocalAssertEquals(tokens[1], null, "blah\\@example.com", "something");
    }

    @Test(expected=NullPointerException.class)
    public void testTokenizeNull() {
        Rfc822Tokenizer.tokenize(null);
    }

    @Test
    public void testTokenize_withListParam() {
        final List<Rfc822Token> list = new ArrayList<>();
        Rfc822Tokenizer.tokenize("", list);
        assertEquals(0, list.size());

        String text = "\"Berg\" (home) <berg\\@example.com>, tom\\@example.com (work)";
        Rfc822Tokenizer.tokenize(text, list);
        assertEquals(2, list.size());
        verifyLocalAssertEquals(list.get(0), "Berg", "berg\\@example.com", "home");
        verifyLocalAssertEquals(list.get(1), null, "tom\\@example.com", "work");

        text = "Foo Bar (something) <foo\\@example.com>, blah\\@example.com (something)";
        list.clear();
        Rfc822Tokenizer.tokenize(text, list);
        assertEquals(2, list.size());
        verifyLocalAssertEquals(list.get(0), "Foo Bar", "foo\\@example.com", "something");
        verifyLocalAssertEquals(list.get(1), null, "blah\\@example.com", "something");
    }


    @Test(expected=NullPointerException.class)
    public void testTokenize_withListParamNull() {
        Rfc822Tokenizer.tokenize(null);
    }

    /**
     * Assert the specified token's name, address and comment all equal specified ones.
     * @param token the Rfc822Token to be asserted.
     * @param name expected name.
     * @param address expected address.
     * @param comment expected comment.
     */
    private void verifyLocalAssertEquals(Rfc822Token token, String name,
            String address, String comment) {
        assertEquals(name, token.getName());
        assertEquals(address, token.getAddress());
        assertEquals(comment, token.getComment());
    }
}