package de.tims.tictactoe;

import static org.junit.jupiter.api.Assertions.assertArrayEquals;
import static org.junit.jupiter.api.Assertions.assertEquals;

import java.util.stream.Stream;

import org.junit.jupiter.api.BeforeAll;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.TestInstance;
import org.junit.jupiter.api.TestInstance.Lifecycle;
import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.Arguments;
import org.junit.jupiter.params.provider.MethodSource;

@TestInstance(Lifecycle.PER_CLASS)
class GameLogicTest {

	private final int SIZE = 3;
	private GameLogic game;
	
	@BeforeAll
	void setUpBeforeClass() throws Exception {
		this.game = new GameLogic(SIZE);
	}

	@Test
	void createGameLogicTest() {
		GameLogic expectedResult = this.game;
		GameLogic realResult = new GameLogic(SIZE);
		
		assertEquals(expectedResult.getClass(), realResult.getClass());
	}
	
	@Test
	void getBoardTest() {
		char[][] expectedResult = new char[][]{{'-', '-', '-'}, 
											   {'-', '-', '-'},
											   {'-', '-', '-'}};
		char[][] realResult = this.game.getBoard();

		assertArrayEquals(expectedResult, realResult);
	}
	
	@Test
	void createGameLogicWithGivenBoardTest() {
		char[][] expectedResult = new char[][]{{'x', '-', '-'}, 
											   {'-', 'o', '-'},
											   {'x', '-', '-'}};
		char[][] givenBoard = expectedResult;
		char[][] realResult = new GameLogic(givenBoard).getBoard();
		
		assertArrayEquals(expectedResult, realResult);
	}
	
	 @ParameterizedTest(name = "[{index}] {0} -> {2} fields")
	 @MethodSource("testCasesForCountPlayfields")
	 void fieldCountTest(String testName, int size, int expectedResult) {
		 	GameLogic game = new GameLogic(size);
			int realResult = game.countFields();
			
			assertEquals(expectedResult, realResult);
	 }
	 
	 @ParameterizedTest(name = "[{index}] {0}")
	 @MethodSource("testCasesForSetField")
	 void setFieldTest(String testName, int column, int row, char player, char[][] expectedResult) {
		 	this.game.setField(column, row, player);
			char[][] realResult = this.game.getBoard();
			
			assertArrayEquals(expectedResult, realResult);
	 }
	 
	 @ParameterizedTest(name = "[{index}] {0}")
	 @MethodSource("testCasesForCheckEmptyField")
	 void fieldIsEmptyTest(String testName, int columnToCheck, int rowToCheck, boolean expectedResult, char[][] board) {
		 	GameLogic game = new GameLogic(board);
			boolean realResult = game.fieldIsEmpty(columnToCheck, rowToCheck);
			
			assertEquals(expectedResult, realResult);
	 }
	 
	 @ParameterizedTest(name = "[{index}] {0}")
	 @MethodSource("testCasesForCheckForWin")
	 void checkForWinTest(String testName, boolean expectedResult, char[][] boardToCheck) {
			boolean realResult = new GameLogic(boardToCheck).checkForWin();
			
			assertEquals(expectedResult, realResult);
	 }
	 
	 private static Stream<Arguments> testCasesForCountPlayfields() {
		    return Stream.of(
		    			Arguments.of("1x1 board with too few fields", 1, 9),
		    			Arguments.of("2x2 board with too few fields", 2, 9),
		    			Arguments.of("3x3 board with 9 playfields", 3, 9),
		    			Arguments.of("4x4 board with 16 playfields", 4, 16),
		    			Arguments.of("5x5 board with 25 playfields", 5,25)
		    		);
	 }
	 
	 private static Stream<Arguments> testCasesForSetField() {
		    return Stream.of(
		    			Arguments.of("set field [0][0] for player 1", 0, 0, 'x', new char[][] 
								    											 {{'x', '-', '-'}, 
								    											  {'-', '-', '-'},
								    											  {'-', '-', '-'}}),
					    Arguments.of("set field [1][0] for player 2", 1, 0, 'o', new char[][] 
																				 {{'x', '-', '-'}, 
																				  {'o', '-', '-'},
																				  {'-', '-', '-'}}),
					    Arguments.of("try to set occupied field [1][0] for player 1", 1, 0, 'x', new char[][] 
																								 {{'x', '-', '-'}, 
																								  {'o', '-', '-'},
																								  {'-', '-', '-'}})
		    		);
	 }
	 
	 private static Stream<Arguments> testCasesForCheckEmptyField() {
		    return Stream.of(
		    			Arguments.of("check an empty field", 0, 0, true, new char[][] 
						    											 {{'-', '-', '-'}, 
						    											  {'-', '-', '-'},
						    											  {'-', '-', '-'}}),
		    			Arguments.of("check a field set by player 1", 0, 0, false, new char[][] 
																				 {{'x', '-', '-'}, 
																				  {'-', '-', '-'},
																				  {'-', '-', '-'}}),
		    			Arguments.of("check a field set by player 2", 0, 0, false, new char[][] 
																				 {{'o', '-', '-'}, 
																				  {'-', '-', '-'},
																				  {'-', '-', '-'}})
		    		);
	 }
	 
	 private static Stream<Arguments> testCasesForCheckForWin() {
		    return Stream.of(
		    			Arguments.of("check win for player 1", true, new char[][] 
																 {{'x', '-', '-'}, 
																  {'x', '-', '-'},
																  {'x', '-', '-'}}),
		    			Arguments.of("check win for player 2", true, new char[][] 
																 {{'o', '-', '-'}, 
																  {'o', '-', '-'},
																  {'o', '-', '-'}})
			    		);
	 }
		
}