package se.urmo.game;


import java.awt.Point;
import java.util.Collections;
import java.util.List;

public class CollisionChecker {
    private GameMap map;

    public CollisionChecker(GameMap map) {
        this.map = map;
    }

    public Point getValidDestination(Direction direction, Point position, int agent_width, int agent_height) {
        List<Point> list = switch (direction) {
            case RIGHT -> List.of(
                    new Point(position.x + agent_width, position.y), // TOPRIGHT
                    new Point(position.x + agent_width, position.y + agent_height)); // BOTTOMRIGHT
            case LEFT -> List.of(
                    position, // TOPLEFT
                    new Point(position.x, position.y + agent_height)); // BOTTOMLEFT
            case UP -> List.of(
                    position, // TOPLEFT
                    new Point(position.x + agent_width, position.y)); // TOPRIGHT
            case DOWN -> List.of(
                    new Point(position.x, position.y + agent_height), // BOTTOMLEFT
                    new Point(position.x + agent_width, position.y + agent_height)); // BOTTOMRIGHT
            default -> Collections.EMPTY_LIST;
        };

        List<Point> list2 = list.stream()
                .map(p -> normalizePosition(direction, p, agent_width, agent_height))
                .toList();

        if (map.isPassable(list2)) {
            return normalizePosition(direction, position, agent_width, agent_height);
        }
        return null; // Blocked
    }

    public Point normalizePosition(Direction dir, Point pos, int agent_width, int agent_height) {
        int x = pos.x;
        int y = pos.y;
        int width = map.getWidth();
        int height = map.getHeight();

        // tunnel
        if (x < GameMap.OFFSET_X) x = width - agent_width - GameMap.OFFSET_X;       // right
        if (x >= (width - GameMap.OFFSET_X)) x = GameMap.OFFSET_X;     // left
//
//        if (y < 0) y = height - 1;      // optional vertical wrap
//        else if (y >= height) y = 0;

        return new Point(x, y);
    }
}