#include <cassert>
#include <iostream>

#include "AppendBuffer.h"


namespace kte {

void
AppendBuffer::Append(const char *s, int slen)
{
	char	*nc = nullptr;
	int	 sz = this->len + slen;

	assert(this->len + slen > this->len);

	if (sz >= this->cap) {
        std::cerr << "AppendBuffer: resizing from " << this->cap << "b to ";
        while (sz > this->cap) {
            if (this->cap == 0) {
                this->cap = sizeof(uintptr_t);
            } else {
                this->cap <<= 1;
            }

        }

        std::cerr << this->cap << "bytes.\n";
        nc = new char[this->cap];
        std::copy_n(this->b, this->len, nc);
        delete[] this->b;
        this->b = nc;
    }
	std::copy_n(s, slen, this->b+len);
	this->len += slen;
}


void
AppendBuffer::Append(const std::string& s)
{
	return this->Append(s.c_str(), static_cast<int>(s.length()));
}


void
AppendBuffer::Append(const char ch)
{
    return this->Append(&ch, 1);
}


std::ostream& operator<<(std::ostream &stream, const AppendBuffer buf) {
    return stream << "AppendBuffer<" << buf.cap << ", " << buf.len << "> " << buf.b;
}


} // namespace kte