package scanner;

import static org.junit.Assert.assertEquals;

import java.io.IOException;
import java.io.InputStream;

import org.junit.Test;

import testutils.TestUtilities;

public class LispScannerTextTester {

    @Test
    public void givenIdentifier_RecordsCorrectText() throws IOException {
        String input = "identifier";

        assertTokenTextMatches(input, input);
    }

    @Test
    public void givenNumber_RecordsCorrectText() throws IOException {
        String input = "192837456";

        assertTokenTextMatches(input, input);
    }

    @Test
    public void givenString_RecordsCorrectText() throws IOException {
        String input = "\"String!!! \n More... \"";

        assertTokenTextMatches(input, input);
    }

    @Test
    public void givenEmptyStream_RecordsCorrectInputStreamName() throws IOException {
        String input = "";
        String expectedInputStreamName = "testInputStream";

        assertInputFileNameMatches(input, expectedInputStreamName);
    }

    private void assertTokenTextMatches(String input, String expectedText) throws IOException {
        InputStream stringInputStream = TestUtilities.createInputStreamFromString(input);
        LispScanner lispScanner = new LispScanner(stringInputStream, "stringInputStream");

        assertEquals(expectedText, lispScanner.getNextToken().getText());
    }

    private void assertInputFileNameMatches(String input, String expectedInputFileName) throws IOException {
        InputStream stringInputStream = TestUtilities.createInputStreamFromString(input);
        LispScanner lispScanner = new LispScanner(stringInputStream, expectedInputFileName);

        assertEquals(expectedInputFileName, lispScanner.getNextToken().getFName());
    }

}