#include "cube3d.h"

// tmp draw map
	static void	calcul_ray_end(t_rcast *rcast, t_vec *ray)
	{
		if (rcast->is_x)
		{
			ray->end.x = rcast->cell_x * rcast->cell;
			if (rcast->ray_sign_x == 1)
				ray->end.x += rcast->cell;
			if (rcast->slope_x)
			{
				rcast->ratio = (double)(ray->end.x - ray->start.x);
				rcast->ratio /= (double)rcast->slope_x;
				ray->end.y = ray->start.y + (double)rcast->slope_y * rcast->ratio;
			}
		}
		else
		{
			ray->end.y = rcast->cell_y * rcast->cell;
			if (rcast->ray_sign_y == 1)
				ray->end.y += rcast->cell;
			if (rcast->slope_y)
			{
				rcast->ratio = (double)(ray->end.y - ray->start.y);
				rcast->ratio /= (double)rcast->slope_y;
				ray->end.x = ray->start.x + (double)rcast->slope_x * rcast->ratio;
			}
		}
	}
// tmp end

static void	calcul_img_column(t_game *game, t_rcast *rcast, t_wall *wall)
{
	int	tmp;

	if (rcast->is_x == 1)
	{
		tmp = (rcast->slope_y + wall->delta) / ft_abs(rcast->slope_x);
		tmp += game->plr.pos.y;
		wall->posx = tmp % rcast->cell;
	}
	else
	{
		tmp = (rcast->slope_x + wall->delta) / ft_abs(rcast->slope_y);
		tmp += game->plr.pos.x;
		wall->posx = tmp % rcast->cell;
	}
}

static void fill_wall_vector(t_rcast *rcast, t_wall *wall)
{
	int	height;

	height = wall->height;
	if (height < 0)
		height = 0;
	wall->limit = 0;
	if (height > rcast->screen_height)
	{
		wall->limit = (height - rcast->screen_height) / 2;
		height = rcast->screen_height;
	}
	rcast->wall.vec.start.y = rcast->screen_height / 2 + height / 2;
	rcast->wall.vec.end.y = rcast->screen_height / 2 - height / 2;
}

static void	calcul_wall(t_rcast *rcast)
{
	long int	height;

	rcast->wall.vec.start.x = rcast->ray_nb;
	rcast->wall.vec.end.x = rcast->ray_nb;
	if (rcast->is_x == 1)
		rcast->wall.delta = rcast->next_x - rcast->ray_step_x;
	else
		rcast->wall.delta = rcast->next_y - rcast->ray_step_y;
	height = rcast->screen_height * rcast->cell;
	if (rcast->slope_x)
		height *= rcast->slope_x;
	if (rcast->slope_y)
		height *= rcast->slope_y;
	if (rcast->wall.delta && rcast->screen_dist)
		height /= (rcast->wall.delta * rcast->screen_dist);
	rcast->wall.height = ft_abs(height);
	fill_wall_vector(rcast, &rcast->wall);
}

void	raycast(t_game *game, t_rcast *rcast)
{
	t_vec	ray;

	rcast->ray_nb = 0;
	while (rcast->ray_nb <= rcast->screen_width)
	{
		// tmp draw map
			// rays
			game->ray_activ = 0;
			if (rcast->ray_nb == game->ray_highlight)
				game->ray_activ = 1;
			//if (game->ray_activ) printf("hello\n");
		// tmp end

		ray_intersect_wall(game, rcast, &ray);

		// tmp draw map
			calcul_ray_end(rcast, &ray);
			if (game->ray_activ)
				draw_line(&game->map_img, &ray, 0x00FF00FF);
			else if (rcast->ray_nb % 10 == 0)
				draw_line(&game->map_img, &ray, 0x00FFFFFF);
		// tmp end

		calcul_wall(rcast);
		calcul_img_column(game, rcast, &rcast->wall);
		draw_column(game, rcast, &rcast->wall, &game->txt);
		(rcast->ray_nb)++;
	}
}