#include "cube3d.h"

static int	pxl_out_limits(t_game *game, int x, int y)
{
	int	xmax;
	int	ymax;

	xmax = game->sizel / (game->bpp / 8);
	ymax = game->win_size_y;
	if (x < 0 || y < 0 || x > xmax || y > ymax)
		return (1);
	return (0);
}

void	draw_pixel(t_game *game, int x, int y, int color)
{
	unsigned int	position;

	if (pxl_out_limits(game, x, y))
		return ;
	position = y * game->sizel + x * (game->bpp / 8);
	*(unsigned int*)(game->img_data + position) = color;
}

void	rotate(t_game *game, int *x, int *y)
{
	int	old_x;
	int	tmp_x;
	int	tmp_y;

	// do nothing if not rotating
	if (game->rot == 0)
		return ;
	// offset center
	tmp_x = *x - game->plr_x;
	tmp_y = *y - game->plr_y;
	// calculate new coordinates
	old_x = tmp_x;
	tmp_x = tmp_x * game->cosi + tmp_y * game->cosj;
	tmp_y = old_x * game->sini + tmp_y * game->sinj;
	// de-offset center
	*x = tmp_x + game->plr_x;
	*y = tmp_y + game->plr_y;
}

void	rotate_double(t_game *game, double *x, double *y)
{
	double	old_x;
	double	tmp_x;
	double	tmp_y;

	// do nothing if not rotating
	if (game->rot == 0)
		return ;
	// offset center
	tmp_x = *x - game->plr_exact_x;
	tmp_y = *y - game->plr_exact_y;
	// calculate new coordinates
	old_x = tmp_x;
	tmp_x = tmp_x * game->cosi + tmp_y * game->cosj;
	tmp_y = old_x * game->sini + tmp_y * game->sinj;
	// de-offset center
	*x = tmp_x + game->plr_exact_x;
	*y = tmp_y + game->plr_exact_y;
}

void	draw_line(t_game *game, int start_x, int start_y, int end_x, int end_y, int color)
{
	int dx;
	int dy;
	int i;
	int j;

	dx = end_x - start_x;
	dy = end_y - start_y;
	i = 0;
	j = 0;
	while (ft_abs(i) <= ft_abs(dx) && ft_abs(j) <= ft_abs(dy))
	{
		draw_pixel(game, start_x + i, start_y + j, color);
		if (!ft_abs(dx) || ft_abs(j) < ft_abs(i * dy / dx))
			j += ft_sign(dy);
		else
			i += ft_sign(dx);
	}
}

void	draw(t_game *game)
{
	draw_map(game);
	draw_rays(game);
	//draw_view(game);
	mlx_put_image_to_window(game->mlx_ptr, game->win_ptr, game->img_ptr, 0, 0);
}