#include <string.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>

#include "String.h"
#include "util.h"

String::String() {
	this->set("");
}

String::String(const String & other) {
	this->set(other.data(), other.size());
}

String::String(const char * c_str) {
	if (c_str == nullptr) c_str = "";
	this->set(c_str);
}

String String::fmt(const char * fmt, ...) {
	va_list args;
	va_start(args, fmt);
	String out = String::va_fmt(args, fmt);
	va_end(args);
	return out;
}

String String::va_fmt(va_list args, const char * fmt) {
	String out;
	va_list args_copy;
	va_copy(args_copy, args);
	out._data_len = vsnprintf(NULL, 0, fmt, args_copy);
	va_end(args_copy);

	safe_free(out._data);
	out._data = static_cast<char *>(malloc(out._data_len + 1));
	vsnprintf(out._data, out._data_len + 1, fmt, args);
	return out;
}

String::~String() {
	safe_free(this->_data);
}

void String::set(const char * data) {
	this->set(data, strlen(data));
}

void String::set(const char * data, size_t data_len) {
	safe_free(this->_data);
	this->_data = static_cast<char *>(malloc(data_len + 1));
	this->_data_len = data_len;
	memcpy(this->_data, data, data_len);
	this->_data[this->_data_len] = '\0';
}

const char * String::c_str() const {
	return this->_data;
}
char * String::data() const {
	return this->_data;
}
size_t String::size() const {
	return this->_data_len;
}
bool String::empty() const {
	return this->_data_len == 0;
}