/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   parse_line.c                                       :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: gbrochar <gbrochar@student.42.fr>          +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2020/12/22 18:41:28 by gbrochar          #+#    #+#             */
/*   Updated: 2020/12/23 21:15:54 by gbrochar         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "scop.h"

t_gl_buf_type		parse_gl_buf_type(char *token)
{
	if (strcmp(token, "v") == SUCCESS)
		return (VERTEX);
	if (strcmp(token, "vt") == SUCCESS)
		return (UV);
	if (strcmp(token, "vn") == SUCCESS)
		return (NORMAL);
	if (strcmp(token, "f") == SUCCESS)
		return (INDEX);
	return (OTHER);
}

void				parse_append_data_tmp(
	t_buf_ui *indices, int vertex_count, unsigned int *data_tmp)
{
	int				i;

	i = 0;
	while (i < 3 * (vertex_count - 2))
	{
		if (indices->ptr == indices->len)
		{
			indices->data = (unsigned int *)realloc(
				indices->data, sizeof(unsigned int) * (indices->len + BUFFER_SIZE));
			indices->len += BUFFER_SIZE;
		}
		indices->data[indices->ptr++] = data_tmp[i++];
	}
}

void				parse_triangulate(t_buf_ui *indices, int vertex_count)
{
	unsigned int	*data_tmp;
	int				i;

	i = 0;
	data_tmp = (unsigned int *)malloc(
		sizeof(unsigned int) * 3 * (vertex_count - 2));
	indices->ptr -= vertex_count;
	while (i < 3 * (vertex_count - 2))
	{
		if (i % 3 == 0)
			data_tmp[i] = indices->data[indices->ptr];
		else if (i % 3 == 1)
			data_tmp[i] = indices->data[indices->ptr + (i - 1) / 3 + 1];
		else if (i % 3 == 2)
			data_tmp[i] = indices->data[indices->ptr + (i - 2) / 3 + 2];
		i++;
	}
	parse_append_data_tmp(indices, vertex_count, data_tmp);
	free(data_tmp);
}

void				parse_triangulate_dispatcher(t_env *e, int vertex_count) {
	parse_triangulate(&(e->object.vertices_indices), vertex_count);
	parse_triangulate(&(e->object.uvs_indices), vertex_count);
	parse_triangulate(&(e->object.normals_indices), vertex_count);
}

int					parse_line(t_env *e, char *line)
{
	char			*token;
	t_gl_buf_type	gl_buf_type;
	int				token_count;
	int				ret;

	token_count = 0;
	ret = SUCCESS;
	while ((token = strtok_r(line, " \t", &line)))
	{
		if (token_count == 0)
			gl_buf_type = parse_gl_buf_type(token);
		else
			ret = parse_token(e, token, gl_buf_type);
		if (ret == FAILURE)
			return (FAILURE);
		token_count++;
	}
	if (gl_buf_type == INDEX && token_count > 4)
		parse_triangulate_dispatcher(e, token_count - 1);
	return (SUCCESS);
}