/*
 * Copyright 2012-2017 Red Hat, Inc.
 *
 * This file is part of Thermostat.
 *
 * Thermostat 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; either version 2, or (at your
 * option) any later version.
 *
 * Thermostat 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 Thermostat; see the file COPYING.  If not see
 * <http://www.gnu.org/licenses/>.
 *
 * Linking this code with other modules is making a combined work
 * based on this code.  Thus, the terms and conditions of the GNU
 * General Public License cover the whole combination.
 *
 * As a special exception, the copyright holders of this code give
 * you permission to link this code with independent modules to
 * produce an executable, regardless of the license terms of these
 * independent modules, and to copy and distribute the resulting
 * executable under terms of your choice, provided that you also
 * meet, for each linked independent module, the terms and conditions
 * of the license of that module.  An independent module is a module
 * which is not derived from or based on this code.  If you modify
 * this code, you may extend this exception to your version of the
 * library, but you are not obligated to do so.  If you do not wish
 * to do so, delete this exception statement from your version.
 */

package com.redhat.thermostat.setup.command.internal.cli;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.PrintStream;

import org.junit.Before;
import org.junit.Test;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertArrayEquals;
import static org.junit.Assert.fail;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.when;

import com.redhat.thermostat.common.cli.Console;
import com.redhat.thermostat.shared.locale.LocalizedString;

public class PasswordCredentialsReaderTest {

    private Console console;
    private PasswordCredentialsReader credsReader;
    private LocalizedString passwordPrompt = new LocalizedString("tell me the password: ");
    private LocalizedString confirmPasswordPrompt = new LocalizedString("repeat the password: ");
    private ByteArrayOutputStream berr;
    private ByteArrayOutputStream bout;
    
    @Before
    public void setup() {
        console = mock(Console.class);
        berr = new ByteArrayOutputStream();
        when(console.getError()).thenReturn(new PrintStream(berr));
        bout = new ByteArrayOutputStream();
        when(console.getOutput()).thenReturn(new PrintStream(bout));
        credsReader = new PasswordCredentialsReader(console, passwordPrompt, confirmPasswordPrompt);
    }
    
    @Test
    public void testPasswordsMismatch() throws IOException {
        String input = "first\nfirst2\nsecond\nsecond\n";
        when(console.getInput()).thenReturn(new ByteArrayInputStream(input.getBytes()));
        char[] password = credsReader.readPassword();
        assertEquals("second", new String(password));
        assertEquals("Passwords did not match!\n", bosToUnixString(berr));
        assertEquals("tell me the password: \nrepeat the password: \ntell me the password: \nrepeat the password: \n",
                bosToUnixString(bout));
    }
    
    @Test
    public void testPasswordInvalid() throws IOException {
        String input = "\n\na\na\n";
        when(console.getInput()).thenReturn(new ByteArrayInputStream(input.getBytes()));
        char[] password = credsReader.readPassword();
        assertEquals("a", new String(password));
        assertEquals("Chosen password invalid!\n", bosToUnixString(berr));
        assertEquals("tell me the password: \nrepeat the password: \ntell me the password: \nrepeat the password: \n",
                bosToUnixString(bout));
    }
    
    @Test
    public void canGetPassword() throws IOException {
        String input = "bar\nbar\n";
        when(console.getInput()).thenReturn(new ByteArrayInputStream(input.getBytes()));
        char[] password = credsReader.readPassword();
        assertArrayEquals(new char[] { 'b', 'a', 'r' }, password);
        assertEquals("Expected no errors", "", new String(berr.toByteArray()));
        assertEquals("tell me the password: \nrepeat the password: \n", bosToUnixString(bout));
    }
    
    @Test
    public void canGetPasswordNoEOLAfterConfirmation() throws IOException {
        String input = "bar\nbar";
        when(console.getInput()).thenReturn(new ByteArrayInputStream(input.getBytes()));
        char[] password = credsReader.readPassword();
        assertArrayEquals(new char[] { 'b', 'a', 'r' }, password);
        assertEquals("Expected no errors", "", new String(berr.toByteArray()));
        assertEquals("tell me the password: \nrepeat the password: \n", bosToUnixString(bout));
    }
    
    /*
     * Insufficient input should not loop forever.
     */
    @Test
    public void testShortReadNoConfirmation() throws IOException {
        String input = "bar\n"; // expected password + confirmation
        when(console.getInput()).thenReturn(new ByteArrayInputStream(input.getBytes()));
        try {
            credsReader.readPassword();
            fail("should not reach here");
        } catch (IOException e) {
            assertEquals("Unexpected EOF while reading password confirmation.", e.getMessage());
        }
    }
    

    @Test
    public void testShortReadNothing() throws IOException {
        String input = ""; // expected password + confirmation
        when(console.getInput()).thenReturn(new ByteArrayInputStream(input.getBytes()));
        try {
            credsReader.readPassword();
            fail("should not reach here");
        } catch (IOException e) {
            assertEquals("Unexpected EOF while reading password.", e.getMessage());
        }
    }
    
    @Test
    public void testShortReadNoMatch() throws IOException {
        String input = "foo\nbar"; // no EOL after bar. next iteration is null password
        when(console.getInput()).thenReturn(new ByteArrayInputStream(input.getBytes()));
        try {
            credsReader.readPassword();
            fail("should not reach here");
        } catch (IOException e) {
            assertEquals("Unexpected EOF while reading password.", e.getMessage());
        }
    }
    
    @Test
    public void noMatchAfter100TriesBreaksLoop() {
        String input = build101NoMatchingPasswords("mypassword");
        when(console.getInput()).thenReturn(new ByteArrayInputStream(input.getBytes()));
        try {
            credsReader.readPassword();
            fail("should not reach here");
        } catch (IOException e) {
            assertEquals("Tried 100 times and got invalid input each time.", e.getMessage());
        }
    }
    
    private String build101NoMatchingPasswords(String password) {
        StringBuilder builder = new StringBuilder();
        for (int i = 0; i < 101; i++) {
            builder.append(password + "\n");
            builder.append(password + "-no-match\n");
        }
        return builder.toString();
    }

    private String bosToUnixString(ByteArrayOutputStream out) {
        return new String(out.toByteArray()).replace("\r\n", "\n");
    }
}