package lect78_impl.model;

/**
 * @overview Represents a position on the board
 * 
 * @attributes
 *  x           Integer     X coordinate
 *  y           Integer     Y coordinate
 */
public class Position {
    private int x;
    private int y;
    
    /**
     * @effects Initializes this as a Position with coordinates (x,y)
     */
    public Position(int x, int y) {
        this.x = x;
        this.y = y;
    }
    
    /**
     * @effects Returns the x coordinate
     */
    public int getX() {
        return x;
    }
    
    /**
     * @effects Returns the y coordinate
     */
    public int getY() {
        return y;
    }
    
    /**
     * @effects Sets the position to (x,y)
     */
    public void setPosition(int x, int y) {
        this.x = x;
        this.y = y;
    }
    
    /**
     * @effects Calculates distance to another position
     * @return The distance as double
     */
    public double getDistance(Position other) {
        int dx = other.x - this.x;
        int dy = other.y - this.y;
        return Math.sqrt(dx * dx + dy * dy);
    }
    
    /**
     * @effects Creates an array of adjacent positions (up, down, left, right)
     * @return Array of positions
     */
    public Position[] getAdjacent() {
        return new Position[] {
            new Position(x+1, y),   // Right
            new Position(x-1, y),   // Left
            new Position(x, y+1),   // Down
            new Position(x, y-1)    // Up
        };
    }
    
    /**
     * @effects Checks if this position equals another position
     */
    @Override
    public boolean equals(Object obj) {
        if (!(obj instanceof Position)) {
            return false;
        }
        Position other = (Position) obj;
        return this.x == other.x && this.y == other.y;
    }
    
    /**
     * @effects Generates a hash code for this position
     */
    @Override
    public int hashCode() {
        return x * 31 + y;
    }
    
    /**
     * @effects Returns string representation of this position
     */
    @Override
    public String toString() {
        return "(" + x + "," + y + ")";
    }
}