#include "cube3d.h"

// tmp, to draw rays
	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	wall_length(t_rcast *rcast)
{
	int	len;

	rcast->wall.start.x = rcast->ray_nb;
	rcast->wall.end.x = rcast->ray_nb;
	if (rcast->is_x == 1)
	{
		len = rcast->next_x - rcast->ray_step_x;
		if (rcast->slope_y)
			len /= ft_abs(rcast->slope_y);
		len = rcast->screen_dist * len / (rcast->slope_x);
	}
	else if (rcast->is_x == 0)
	{
		len = rcast->next_y - rcast->ray_step_y;
		if (rcast->slope_x)
			len /= ft_abs(rcast->slope_x);
		len = rcast->screen_dist * len / (rcast->slope_y);
	}
	rcast->ray_len = ft_abs(len);
}

static void	wall_height(t_rcast *rcast)
{
	int	height;

	height = rcast->screen_height * (rcast->hor - rcast->ray_len) / rcast->hor;

	if (height < 0)
		height = 0;
	if (height > rcast->screen_height)
		height = rcast->screen_height;

	rcast->wall.start.y = rcast->screen_height / 2 + height / 2;
	rcast->wall.end.y = rcast->screen_height / 2 - height / 2;
}

void	draw_column(t_game *game, t_rcast *rcast)
{
	t_vec	plan;
	int		color;

	plan.start.x = rcast->ray_nb;
	plan.end.x = rcast->ray_nb;
	if (rcast->wall.start.y > 0)
	{
		plan.start.y = rcast->screen_height;
		plan.end.y = rcast->wall.start.y;
		draw_line(&game->img, &plan, 0x00FF0000);
	}
	if (rcast->wall.start.y < rcast->screen_height)
	{
		plan.start.y = rcast->wall.end.y;
		plan.end.y = 0;
		draw_line(&game->img, &plan, 0x000000FF);
	}
	color = 0x00FF00FF;
	if (rcast->is_x)
		color = 0x00EE00EE;
	draw_line(&game->img, &rcast->wall, color);
}

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

	rcast->ray_nb = 0;
	while (rcast->ray_nb <= rcast->screen_width)
	{
		ray_intersect(game, rcast, &ray);

		// tmp, to draw the map
			calcul_ray_end(rcast, &ray);
			draw_line(&game->map_img, &ray, 0x00FF00FF);
		// tmp end

		wall_length(rcast);
		wall_height(rcast);
		draw_column(game, rcast);
		(rcast->ray_nb)++;
	}
}