/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_atoi.c                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: tischmid <marvin@42.fr>                    +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2023/03/27 19:51:48 by tischmid          #+#    #+#             */
/*   Updated: 2023/03/31 21:58:42 by tischmid         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

unsigned int	char_count(const char *str, char c)
{
	unsigned int	count;

	count = 0;
	while (*str)
	{
		if (*str == c)
			++count;
		++str;
	}
	return (count);
}

// Return 0 if the base is invalid or the length of the base otherwise
unsigned int	is_valid_base(const char *base)
{
	unsigned int	size;

	size = 0;
	while (*base)
	{
		if (*base == '+' || *base == '-' || *base == ' ')
			return (0);
		if (char_count(base, *base) > 1)
			return (0);
		++size;
		++base;
	}
	if (size < 2)
		return (0);
	return (size);
}

int	char_index(const char *str, const char c)
{
	int	idx;

	idx = 0;
	while (*str)
	{
		if (*str++ == c)
			return (idx);
		++idx;
	}
	return (-1);
}

int	ft_atoi(char *str)
{
	int				sign;
	int				abs;
	int				index_in_base;
	unsigned int	base_len;

	abs = 0;
	sign = 1;
	base_len = is_valid_base("0123456789");
	if (!base_len)
		return (0);
	while (*str == ' ' || *str == '\t'
		|| *str == '\n' || *str == '\r'
		|| *str == '\f' || *str == '\v')
		++str;
	while (*str == '+' || *str == '-')
		if (*str++ == '-')
			sign *= -1;
	index_in_base = char_index("0123456789", *str);
	while (index_in_base >= 0)
	{
		abs = abs * base_len + index_in_base;
		++str;
		index_in_base = char_index("0123456789", *str);
	}
	return (sign * abs);
}

/* ////
#include <stdio.h>

int	main(void)
{
	printf("Expected:<> Actual:<%d>\n", ft_atoi(""));
	printf("Expected:<0> Actual:<%d>\n", ft_atoi("0"));
	printf("Expected:<1> Actual:<%d>\n", ft_atoi("1"));
	printf("Expected:<14> Actual:<%d>\n", ft_atoi("14"));
	printf("Expected:<120> Actual:<%d>\n", ft_atoi("120"));
	printf("Expected:<-0> Actual:<%d>\n", ft_atoi("-0"));
	printf("Expected:<-1> Actual:<%d>\n", ft_atoi("-1"));
	printf("Expected:<-14> Actual:<%d>\n", ft_atoi("-14"));
	printf("Expected:<-120> Actual:<%d>\n", ft_atoi("-120"));
	printf("Expected:<2147483647> Actual:<%d>\n", ft_atoi("2147483647"));
	printf("Expected:<-2147483648> Actual:<%d>\n", ft_atoi("-2147483648"));
	printf("Expected:<--2147483648> Actual:<%d>\n", ft_atoi("--2147483648"));
	printf("Expected:<---2147483648> Actual:<%d>\n", ft_atoi("---2147483648"));
	printf("Expected:<----2147483648> Actual:<%d>\n", ft_atoi("----2147483648"));
	printf("Expected:<+-+14> Actual:<%d>\n", ft_atoi("+-+14"));
	printf("Expected:<-+-+14> Actual:<%d>\n", ft_atoi("-+-+14"));
	printf("Expected:<-+-14> Actual:<%d>\n", ft_atoi("-+-14"));
	printf("Expected:<+-+-14> Actual:<%d>\n", ft_atoi("+-+-14"));
	printf("Expected:< -14> Actual:<%d>\n", ft_atoi(" -14"));
	printf("Expected:< +-+14> Actual:<%d>\n", ft_atoi(" +-+14"));
	printf("Expected:< -+-+14> Actual:<%d>\n", ft_atoi(" -+-+14"));
	printf("Expected:< -+-14> Actual:<%d>\n", ft_atoi(" -+-14"));
	printf("Expected:< +-+-14> Actual:<%d>\n", ft_atoi(" +-+-14"));
	printf("Expected:<       -14> Actual:<%d>\n", ft_atoi("       -14"));
	printf("Expected:<       +-+14> Actual:<%d>\n", ft_atoi("       +-+14"));
	printf("Expected:<       -+-+14> Actual:<%d>\n", ft_atoi("       -+-+14"));
	printf("Expected:<       -+-14> Actual:<%d>\n", ft_atoi("       -+-14"));
	printf("Expected:<       +-+-14> Actual:<%d>\n", ft_atoi("       +-+-14"));
	printf("Expected:<\t\t-14> Actual:<%d>\n", ft_atoi("\t\t-14"));
	printf("Expected:<\t\t+-+14> Actual:<%d>\n", ft_atoi("\t\t+-+14"));
	printf("Expected:<\t\t-+-+14> Actual:<%d>\n", ft_atoi("\t\t-+-+14"));
	printf("Expected:<\t\t-+-14> Actual:<%d>\n", ft_atoi("\t\t-+-14"));
	printf("Expected:<\t\t+-+-14> Actual:<%d>\n", ft_atoi("\t\t+-+-14"));
	printf("Expected:<\n\n-14> Actual:<%d>\n", ft_atoi("\n\n-14"));
	printf("Expected:<\n\n+-+14> Actual:<%d>\n", ft_atoi("\n\n+-+14"));
	printf("Expected:<\n\n-+-+14> Actual:<%d>\n", ft_atoi("\n\n-+-+14"));
	printf("Expected:<\n\n-+-14> Actual:<%d>\n", ft_atoi("\n\n-+-14"));
	printf("Expected:<\n\n+-+-14> Actual:<%d>\n", ft_atoi("\n\n+-+-14"));
	printf("Expected:<\n\n-14baba1> Actual:<%d>\n", ft_atoi("\n\n-14baba1"));
	printf("Expected:<\n\n+-+14baba1> Actual:<%d>\n", ft_atoi("\n\n+-+14baba1"));
	printf("Expected:<\n\n-+-+14baba1> Actual:<%d>\n", ft_atoi("\n\n-+-+14baba1"));
	printf("Expected:<\n\n-+-14baba1> Actual:<%d>\n", ft_atoi("\n\n-+-14baba1"));
	printf("Expected:<\n\n+-+-14baba1> Actual:<%d>\n", ft_atoi("\n\n+-+-14baba1"));
}
*/ ////