#include "HttpClient.h"
#include "Exceptions.h"

#include <iomanip>
#include <sstream>
#include <curl/curl.h>

namespace HttpClient
{

	std::string UrlEncode(std::string url)
	{
		std::ostringstream ss;
		for (unsigned i=0; i<url.size(); i++)
		{
			char ch = url.at(i);
			if (isalnum(ch))
				ss << ch;
			else
				ss << "%" << std::setw(2) << std::hex << std::setfill('0') <<(int) ch;
		}
		return ss.str();
	}


	size_t writefunction( void *ptr, size_t size, size_t nmemb, void *stream)
	{
		int total = size * nmemb;

		char* bytes = reinterpret_cast<char*>(ptr);
		std::vector<char>* vec = reinterpret_cast< std::vector<char>* >(stream);

		vec->reserve( vec->size() + total); //allow vector to do a preallocation if necessary

		int i;
		for (i=0; i<total; i++)
		{
			vec->push_back( bytes[i] );
		}
		return i;
	}

	std::vector<char> Get(std::string url)
	{
		std::vector<char> buf;
		char errmsg[128] = "";

		CURL* curl = curl_easy_init();
		if (curl == 0)
			throw httpexception("could not init CURL");

		curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, errmsg);

		curl_easy_setopt(curl, CURLOPT_URL, url.c_str() );
		curl_easy_setopt(curl, CURLOPT_FAILONERROR,1);
		curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, writefunction);
		curl_easy_setopt(curl, CURLOPT_WRITEDATA, &buf);

		int res = curl_easy_perform(curl);
		curl_easy_cleanup(curl);

		if (res != 0)
			throw httpexception(errmsg);



		return buf;
	}

	std::string GetString(std::string url)
	{
		std::vector<char> buf = Get(url);
		buf.push_back(0);
		return std::string(&buf[0]);
	}
}