function [dh, dv] = wallDistance(corners, x, y)
% Calculates the distances from the walls.
% - Negative value means colision
% - Inf value means no wall in this direction
% 
% Inputs:
%   corners[] : corner matrix (each line is a corner point)
%   x:          Car's x position
%   y:          Car's y position
% Outputs:
%   dh:         Horizontal distance from wall
%   dv:         Vertical distance from wall

    % Calculate the distances in the x direction
    srt_corners = sortrows(corners, 2);
    active_corners = -Inf(size(corners));

    for i=1:length(srt_corners)
        if srt_corners(i, 2) >= y
            active_corners = srt_corners(i:end, :);
            break;
        end
    end
    dx = active_corners(:, 1) - x;  % Walls are on the right
    dh = min(dx); % Minimum distance in x direction

    % Calculate the distances in the y direction
    srt_corners = sortrows(corners, 1, 'descend');
    active_corners = -Inf(size(corners));

    for i=1:length(srt_corners)
        if srt_corners(i, 1) <= x
            active_corners = srt_corners(i:end, :);
            break;
        end
    end
    dy = y - active_corners(:, 2);  % Walls are on the bottom
    dv = min(dy); % Minimum distance in y direction

    if ~isfinite(dh) dh = Inf; end
    if ~isfinite(dv) dv = Inf; end
end