package mindustry.graphics;

import arc.*;
import arc.graphics.*;
import arc.graphics.g2d.*;
import arc.math.*;
import arc.math.geom.*;
import arc.util.*;
import mindustry.core.*;
import mindustry.gen.*;
import mindustry.world.*;

import static arc.Core.*;
import static mindustry.Vars.*;

public class DebugCollisionRenderer{
    static final float[] edges = {
    1, -1,
    1, 1,
    -1, 1,
    -1, -1,
    };

    public static void draw(){
        Rect rect = camera.bounds(new Rect());
        Draw.draw(Layer.overlayUI, () -> {
            //hitboxes
            Draw.color(Color.green, 0.3f);
            Groups.draw.each(d -> {
                if(d instanceof Hitboxc h && rect.overlaps(Tmp.r1.setCentered(d.x(), d.y(), d.clipSize()))){
                    Fill.square(d.x(), d.y(), h.hitSize()/2f);
                }
            });

            //tile hitboxes for units
            Lines.stroke(0.4f, Color.magenta);

            int rx = Mathf.clamp((int)(Core.camera.width / tilesize / 2) + 1, 0, world.width()/2);
            int ry = Mathf.clamp((int)(Core.camera.height / tilesize / 2) + 1, 0, world.height()/2);

            for(int x = -rx; x <= rx; x++){
                for(int y = -ry; y <= ry; y++){
                    int wx = World.toTile(Core.camera.position.x) + x;
                    int wy = World.toTile(Core.camera.position.y) + y;
                    Tile tile = world.tile(wx, wy);
                    if(tile != null && tile.solid()){
                        for(int i = 0; i < 4; i++){
                            Tile other = tile.nearby(i);
                            if(other == null || !other.solid()){
                                Lines.line(
                                    wx * tilesize + edges[i*2] * tilesize/2f,
                                    wy * tilesize + edges[i*2+1] * tilesize/2f,
                                    wx * tilesize + edges[((i + 1) % 4)*2] * tilesize/2f,
                                    wy * tilesize + edges[((i + 1) % 4)*2+1] * tilesize/2f
                                );
                            }
                        }
                    }
                }
            }


            Groups.draw.each(d -> {
                if(d instanceof Unit u && rect.overlaps(Tmp.r1.setCentered(u.x, u.y, d.clipSize())) && !u.isFlying()){
                    u.hitboxTile(Tmp.r1);

                    Lines.rect(Tmp.r1);
                }
            });

            //physics hitboxes
            Lines.stroke(0.5f);
            Draw.color(Color.red, 0.5f);
            Groups.draw.each(d -> {
                if(d instanceof Unit u && rect.overlaps(Tmp.r1.setCentered(u.x, u.y, u.clipSize()))){
                    Lines.circle(u.x, u.y, u.hitSize * unitCollisionRadiusScale);
                }
            });
            Draw.reset();

        });


        Draw.reset();
    }
}