utils.js

function getCharAtPos(x, y) {
	// Move the cursor to position (x, y)
	console.gotoxy(x, y);
	// Calculate the index in the screen buffer
	var index = (y - 1) * console.screen_columns + (x - 1);

	// Get the character at that position
	var charAtPosition = console.screen_buf[index];
	return charAtPosition;
}

function loadMapToGrid(filename, grid) {
	var file = new File(filename);
	if (!file.open("r")) {
		alert("Failed to open " + filename);
		return;
	}

	var y = 0;
	while (!file.eof && y < grid.length) {
		var line = file.readln();
		for (var x = 0; x < line.length && x < grid[y].length; x++) {
			grid[y][x] = line.charAt(x);
		}
		y++;
	}

	file.close();
	return grid;
}

function checkSingleCharacter(key) {
	var commonKeys = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789 `~!@#$%^&*()-_=+[]{}|;:\'",.<>/?\\'.split('');
	if (typeof key === 'string' && key.length === 1) {
		var isCommonKey = false;
		for (var i = 0; i < commonKeys.length; i++) {
			if (commonKeys[i] === key) {
				isCommonKey = true;
				break;
			}
		}
		if (!isCommonKey) {
			return false;
		}
		return key;
	}
	return false;
}

function offScreenCursor() {
	console.gotoxy(200, 200); // Move cursor off screen
}

function base64ToInt(str) {
    // Base64 character set
    const base64Chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
    // Validate input
    if (!str || str.length === 0) {
        return 0;
    }
    var result = 0;
    // Process each character
    for (var i = 0; i < str.length; i++) {
        const char = str[i];
        const value = indexOf(base64Chars, char);
        if (value === -1) {
            return "Invalid base64 character"
		}
        result = (result << 6) | value;
    }
    
    return result;
}

function indexOf(array, searchElement) {
	startIndex = 0;
    if (startIndex >= array.length) {
        return -1;
    }
    if (searchElement !== searchElement) {
        for (var i = startIndex; i < array.length; i++) {
            if (array[i] !== array[i]) {
                return i;
            }
        }
        return -1;
    }
    for (var i = startIndex; i < array.length; i++) {
        if (array[i] === searchElement) {
            return i;
        }
    }
    return -1;
}