package se.urmo.my2dgame.util;

import se.urmo.my2dgame.entity.Entity;
import se.urmo.my2dgame.main.Screen;
import se.urmo.my2dgame.tile.World;

public class CollisionChecker {

    private final World world;

    public CollisionChecker(World world) {
        this.world = world;
    }

    public boolean checkTile(Entity entity) {
        int entityLeftCol = entity.boxLeft() / Screen.TILE_SIZE;
        int entityRightCol = entity.boxRight() / Screen.TILE_SIZE;
        int entityTopRow = entity.boxTop() / Screen.TILE_SIZE;
        int entityBottomRow = entity.boxBottom() / Screen.TILE_SIZE;

        switch (entity.direction){
            case N -> {
                entityTopRow = (entity.boxTop() - entity.speed)/ Screen.TILE_SIZE;
                return isNonePassable(entityTopRow, entityLeftCol, entityTopRow, entityRightCol);
            }
            case S -> {
                entityBottomRow = (entity.boxBottom() + entity.speed)/ Screen.TILE_SIZE;
                return isNonePassable(entityBottomRow,entityLeftCol,entityBottomRow,entityRightCol);
            }
            case W -> {
                entityLeftCol = (entity.boxLeft() - entity.speed)/ Screen.TILE_SIZE;
                return isNonePassable(entityTopRow, entityLeftCol, entityBottomRow, entityLeftCol);
            }
            case E -> {
                entityRightCol = (entity.boxRight() + entity.speed)/ Screen.TILE_SIZE;
                return isNonePassable(entityTopRow, entityRightCol, entityBottomRow, entityRightCol);
            }
            case NE -> {
                entityTopRow = (entity.boxTop() - entity.speed)/ Screen.TILE_SIZE;
                entityRightCol = (entity.boxRight() + entity.speed)/ Screen.TILE_SIZE;
                entityLeftCol = (entity.boxLeft() + entity.speed)/ Screen.TILE_SIZE;
                entityBottomRow = (entity.boxBottom() - entity.speed)/ Screen.TILE_SIZE;
                return isNonePassable(entityTopRow, entityLeftCol, entityBottomRow, entityRightCol);
            }
            case NW -> {
                entityTopRow = (entity.boxTop() - entity.speed)/ Screen.TILE_SIZE;
                entityRightCol = (entity.boxRight() - entity.speed)/ Screen.TILE_SIZE;
                entityLeftCol = (entity.boxLeft() - entity.speed)/ Screen.TILE_SIZE;
                entityBottomRow = (entity.boxBottom() - entity.speed)/ Screen.TILE_SIZE;
                return isNonePassable(entityBottomRow, entityLeftCol, entityTopRow, entityRightCol);
            }
            case SW -> {
                entityTopRow = (entity.boxTop() + entity.speed)/ Screen.TILE_SIZE;
                entityRightCol = (entity.boxRight() - entity.speed)/ Screen.TILE_SIZE;
                entityLeftCol = (entity.boxLeft() - entity.speed)/ Screen.TILE_SIZE;
                entityBottomRow = (entity.boxBottom() + entity.speed)/ Screen.TILE_SIZE;
                return isNonePassable(entityTopRow, entityLeftCol, entityBottomRow, entityRightCol);
            }
            case SE -> {
                entityTopRow = (entity.boxTop() + entity.speed)/ Screen.TILE_SIZE;
                entityRightCol = (entity.boxRight() + entity.speed)/ Screen.TILE_SIZE;
                entityLeftCol = (entity.boxLeft() + entity.speed)/ Screen.TILE_SIZE;
                entityBottomRow = (entity.boxBottom() + entity.speed)/ Screen.TILE_SIZE;
                return isNonePassable(entityBottomRow, entityLeftCol, entityTopRow, entityRightCol);
            }
        }
        return false;
    }

    private boolean isNonePassable(int row1, int col1, int row2, int col2) {
        int tileNum2 = world.mapTileNum[row1][col1];
        int tileNum1 = world.mapTileNum[row2][col2];

        return world.tiles[tileNum1].isCollision() || world.tiles[tileNum2].isCollision();
    }
}