package scanner;

import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;

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

import file.FilePosition;
import file.FilePositionTracker;

public class FilePositionTrackerTester {

    public static final String FILE_NAME = "testFileName";

    private FilePositionTracker trackerUnderTest;

    @Before
    public void setUp() throws Exception {
        trackerUnderTest = new FilePositionTracker(FILE_NAME);
    }

    @Test
    public void filePositionEquality_CorrectlyReturnsTrue() {
        FilePosition positionOne = new FilePosition(FILE_NAME);
        positionOne.setLineNumber(5);
        positionOne.setColumnNumber(9);

        FilePosition positionTwo = new FilePosition(FILE_NAME);
        positionTwo.setLineNumber(5);
        positionTwo.setColumnNumber(9);

        assertTrue(positionOne.isEqual(positionTwo));
    }

    @Test
    public void filePositionEquality_CorrectlyReturnsFalseWithDifferentLine() {
        FilePosition positionOne = new FilePosition(FILE_NAME);
        positionOne.setLineNumber(5);
        positionOne.setColumnNumber(9);

        FilePosition positionTwo = new FilePosition(FILE_NAME);
        positionTwo.setLineNumber(8);
        positionTwo.setColumnNumber(9);

        assertFalse(positionOne.isEqual(positionTwo));
    }

    @Test
    public void filePositionEquality_CorrectlyReturnsFalseWithDifferentColumn() {
        FilePosition positionOne = new FilePosition(FILE_NAME);
        positionOne.setLineNumber(5);
        positionOne.setColumnNumber(9);

        FilePosition positionTwo = new FilePosition(FILE_NAME);
        positionTwo.setLineNumber(5);
        positionTwo.setColumnNumber(10);

        assertFalse(positionOne.isEqual(positionTwo));
    }

    @Test
    public void filePositionEquality_CorrectlyReturnsFalseWithDifferentFileName() {
        FilePosition positionOne = new FilePosition("FileOne");
        positionOne.setLineNumber(5);
        positionOne.setColumnNumber(9);

        FilePosition positionTwo = new FilePosition("FileTwo");
        positionTwo.setLineNumber(5);
        positionTwo.setColumnNumber(9);

        assertFalse(positionOne.isEqual(positionTwo));
    }

    @Test
    public void noMovement_ReturnsInitialPosition() {
        FilePosition expectedPosition = new FilePosition(FILE_NAME);
        expectedPosition.setLineNumber(1);
        expectedPosition.setColumnNumber(0);

        assertTrue(expectedPosition.isEqual(trackerUnderTest.getCurrentPosition()));
    }

    @Test
    public void advanceOneColumn_ReturnsCorrectPosition() {
        FilePosition expectedPosition = new FilePosition(FILE_NAME);
        expectedPosition.setLineNumber(1);
        expectedPosition.setColumnNumber(1);

        trackerUnderTest.incrementColumn();

        assertTrue(expectedPosition.isEqual(trackerUnderTest.getCurrentPosition()));
    }

    @Test
    public void advanceOneLine_ReturnsCorrectPosition() {
        FilePosition expectedPosition = new FilePosition(FILE_NAME);
        expectedPosition.setLineNumber(2);
        expectedPosition.setColumnNumber(0);

        trackerUnderTest.incrementLine();

        assertTrue(expectedPosition.isEqual(trackerUnderTest.getCurrentPosition()));
    }

    @Test
    public void advanceOneLine_ResetsColumn() {
        FilePosition expectedPosition = new FilePosition(FILE_NAME);
        expectedPosition.setLineNumber(2);
        expectedPosition.setColumnNumber(0);

        trackerUnderTest.incrementColumn();
        trackerUnderTest.incrementLine();

        assertTrue(expectedPosition.isEqual(trackerUnderTest.getCurrentPosition()));
    }

}