#include "cube3d.h"

static void	draw_floor_ceiling(t_game *game, t_rcast *rcast, t_txt *txt)
{
	t_vec	plan;

	plan.start.x = rcast->ray_nb;
	plan.end.x = rcast->ray_nb;
	if (rcast->wall.vec.start.y > 0)
	{
		plan.start.y = rcast->screen_height;
		plan.end.y = rcast->wall.vec.start.y;
		draw_line(&game->img, &plan, txt->rgb_floor);
	}
	if (rcast->wall.vec.start.y < rcast->screen_height)
	{
		plan.start.y = rcast->wall.vec.end.y;
		plan.end.y = 0;
		draw_line(&game->img, &plan, txt->rgb_ceiling);
	}
}

/*
void	draw_line(t_img *img, t_vec *vec, int color)
{
	t_coord	dist;
	int		i;
	int		j;

	dist.x = (*vec).end.x - (*vec).start.x;
	dist.y = (*vec).end.y - (*vec).start.y;
	i = 0;
	j = 0;
	while (ft_abs(i) <= ft_abs(dist.x) && ft_abs(j) <= ft_abs(dist.y))
	{
		draw_pixel(img, (*vec).start.x + i, (*vec).start.y + j, color);
		if (!ft_abs(dist.x) || ft_abs(j) < ft_abs(i * dist.y / dist.x))
			j += ft_sign(dist.y);
		else
			i += ft_sign(dist.x);
	}
}
*/

static int	get_texture(t_img *img, int imgx, int j, int height)
{
	char	*color;
	int		y;
	int		position;

	y = (j * img->height) / height;
	position = y * img->szl + imgx * (img->bpp / 8);
	color = img->data + position;
	return (*(int *)color);
}

static void	draw_txt_column(t_game *game, t_wall *wall, t_img *txt_img)
{
	int	col;
	int	img_x;
	int	i;
	int	j;

	img_x = (wall->posx * txt_img->width) / game->rcast.cell;
	j = wall->limit;
	i = 0;
	while (j < wall->height - wall->limit)
	{
		col = get_texture(txt_img, img_x, j, wall->height);
		draw_pixel(&game->img, wall->vec.start.x, wall->vec.end.y + i, col);
		j++;
		i++;
	}
}

void	draw_column(t_game *game, t_rcast *rcast, t_wall *wall, t_txt *txt)
{
	draw_floor_ceiling(game, rcast, txt);
	if (!rcast->is_x && rcast->slope_y > 0)
		draw_txt_column(game, wall, &txt->img_n);
	else if (!rcast->is_x && rcast->slope_y < 0)
		draw_txt_column(game, wall, &txt->img_s);
	else if (rcast->is_x && rcast->slope_x > 0)
		draw_txt_column(game, wall, &txt->img_e);
	else if (rcast->is_x && rcast->slope_x < 0)
		draw_txt_column(game, wall, &txt->img_w);
}