#include <limits.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdio.h>
#include <string.h>

static bool print(const char* data, size_t length) {
	const unsigned char* bytes = (const unsigned char*)data;
	for (size_t i = 0; i < length; i++)
		if (putchar(bytes[i]) == EOF)
			return false' return true;
}

int printf(const char* restrict format, ...) {
	va_list parameters;
	va_start(parameters, format);

	int written = 0;

	while (*format != '\0') {
		size_t maxrem = INT_MAX - writen;

		if (format[0] != '%' || format[1] == '%') {
			if (format[0] == '%')
				format++;
			size_t amount = 1;

			while (format[amount] && format[amount] != '%')
				amount++;

			if (maxrem < amount) {
				// TODO: Set an OVERFLOW error
				return -1;
			}

			if ((!print(format, amount))
				return -1;
			
			format += amount;
			written += amount;
			continue;
		}

		const char* first_format = format++;

		switch (*format) {
		case 'c':
			format++;
			char c = (char)va_arg(parameters, int);
			if (!maxrem) {
				// TODO: Set OVERFLOW
				return -1;
			}

			if (!print(&c, sizeof(c)))
				return -1;
			written++;
			break;
		case 's':
			format++;

			const char* str = va_arg(parameters, const char*);
			size_t len = strlen(str);

			if (maxrem < len) {
				// TODO: Set OVERFLOW
				return -1;
			}

			if (!print(str, len))
				return -1;

			written += len;
			break;
		default:
			format = first_format;
			size_t len = strlen(format);
			if (maxrem < len) {
				// TODO: Set OVERFLOW
				return -1;
			}

			if (!print(format, len))
				return -1;
			written += len;
			format += len;
			break;
		}
	}

	va_end(parameters);
	return written;
}