trigo-web/tools/testTerminalBug.ts

/**
 * Test case to verify incorrect terminal detection
 *
 * Scenario: 5x1x1 board
 * 1. a y - Black a(0), White y(3)
 * 2. b z - Black b(1), White z(4)
 * 3. 0   - Black 0(2) captures White {y, z}
 *
 * After move 3:
 * Board: [Black(a), Black(b), Black(0), Empty(y), Empty(z)]
 *
 * Problem: System declares game finished with "Black: 5, White: 0"
 * Reality: White can still play at y or z and potentially capture Black stones
 */

import { TrigoGame } from "../inc/trigo/game.js";

function testTerminalDetection() {
	console.log("================================================================================");
	console.log("Testing Terminal Detection Bug in 5x1x1 Board");
	console.log("================================================================================\n");

	const game = new TrigoGame({ x: 5, y: 1, z: 1 });
	game.startGame();

	console.log("Initial board (5x1x1):");
	console.log("Positions: a(0) - b(1) - 0(2) - y(3) - z(4)\n");

	// Move 1: Black a, White y
	console.log("Move 1: Black plays a(0)");
	game.drop({ x: 0, y: 0, z: 0 });
	console.log("Board:", game.getBoard().flat().flat());
	console.log("Territory:", game.getTerritory());

	console.log("\nMove 1b: White plays y(3)");
	game.drop({ x: 3, y: 0, z: 0 });
	console.log("Board:", game.getBoard().flat().flat());
	console.log("Territory:", game.getTerritory());

	// Move 2: Black b, White z
	console.log("\nMove 2: Black plays b(1)");
	game.drop({ x: 1, y: 0, z: 0 });
	console.log("Board:", game.getBoard().flat().flat());
	console.log("Territory:", game.getTerritory());

	console.log("\nMove 2b: White plays z(4)");
	game.drop({ x: 4, y: 0, z: 0 });
	console.log("Board:", game.getBoard().flat().flat());
	console.log("Territory:", game.getTerritory());

	// Move 3: Black 0 - should capture White {y, z}
	console.log("\nMove 3: Black plays 0(2) - should capture White stones");
	game.drop({ x: 2, y: 0, z: 0 });
	console.log("Board:", game.getBoard().flat().flat());
	console.log("Territory:", game.getTerritory());
	console.log("Game status:", game.getGameStatus());

	// Check valid moves for White
	console.log("\n" + "=".repeat(80));
	console.log("Analysis after Move 3:");
	console.log("=".repeat(80));

	const validMoves = game.validMovePositions();
	console.log("\nValid move positions for White:", validMoves);
	console.log("Number of valid moves:", validMoves.length);

	// Check if White can capture
	const whiteCanCapture = game.hasCapturingMove(2);
	console.log("\nWhite has capturing move available?", whiteCanCapture);

	// Try White playing at y(3)
	console.log("\n" + "=".repeat(80));
	console.log("Hypothetical: What if White plays at y(3)?");
	console.log("=".repeat(80));

	const testGame = game.clone();
	try {
		testGame.drop({ x: 3, y: 0, z: 0 });
		console.log("Board after White y(3):", testGame.getBoard().flat().flat());
		console.log("Territory:", testGame.getTerritory());

		// Check if any Black stones were captured
		const boardAfter = testGame.getBoard().flat().flat();
		const blackStones = boardAfter.filter(s => s === 1).length;
		const whiteStones = boardAfter.filter(s => s === 2).length;
		console.log(`Stones on board: Black=${blackStones}, White=${whiteStones}`);

		if (blackStones < 3) {
			console.log("\n⚠️  BLACK STONES WERE CAPTURED!");
			console.log("This proves the game was NOT terminal after move 3!");
		}
	} catch (error: any) {
		console.log("Error:", error.message);
	}

	// Conclusion
	console.log("\n" + "=".repeat(80));
	console.log("CONCLUSION:");
	console.log("=".repeat(80));
	console.log("The current terminal detection logic is INCORRECT.");
	console.log("It only checks hasBlack && hasWhite, which fails when one player");
	console.log("has all their stones captured.");
	console.log("\nThe game should continue until no more captures are possible,");
	console.log("not just when neutral territory is zero.");
}

testTerminalDetection();