package triangle.syntacticAnalyser;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotEquals;
import static org.junit.Assert.assertThrows;

import org.junit.Test;
import org.junit.function.ThrowingRunnable;

import triangle.ErrorReporter;
import triangle.syntacticAnalyzer.Parser;
import triangle.syntacticAnalyzer.Scanner;
import triangle.syntacticAnalyzer.SourceFile;

public class TestScanner {

	@Test
	public void testHi() {
		compileExpectSuccess("/hi.tri");
	}
	

	@Test
	public void testHiNewComment() {
		compileExpectFailure("/hi-newcomment.tri");
	}
	

	@Test
	public void testHiNewComment2() {
		compileExpectFailure("/hi-newcomment2.tri");
	}
	

	@Test
	public void testPoundDemo() {
		compileExpectFailure("/pounddemo.tri");
	}
	
	
	
	private void compileExpectSuccess(String filename) {
		// build.gradle has a line sourceSets.test.resources.srcDir file("$rootDir/programs")
		// which adds the programs directory to the list of places Java can easily find files
		// getResource() below searches for a file, which is in /programs 
		SourceFile source = SourceFile.ofPath(this.getClass().getResource(filename).getFile().toString());

		Scanner scanner = new Scanner(source);
		ErrorReporter reporter = new ErrorReporter(true);
		Parser parser = new Parser(scanner, reporter);
		
		parser.parseProgram();
		
		// we should get to here with no exceptions
		
		assertEquals("Problem compiling " + filename, 0, reporter.getNumErrors());
	}
	
	private void compileExpectFailure(String filename) {
		SourceFile source = SourceFile.ofPath(this.getClass().getResource(filename).getFile().toString());
		Scanner scanner = new Scanner(source);
		ErrorReporter reporter = new ErrorReporter(true);
		Parser parser = new Parser(scanner, reporter);

		// we expect an exception here as the program has invalid syntax
		assertThrows(RuntimeException.class, new ThrowingRunnable() {
			public void run(){
				parser.parseProgram();
			}
		});
		
		// currently this program will fail
		assertNotEquals("Problem compiling " + filename, 0, reporter.getNumErrors());
	}

}