/**
 * @file httpcommon.cpp
 * @brief 
 *
 * $LicenseInfo:firstyear=2012&license=viewerlgpl$
 * Second Life Viewer Source Code
 * Copyright (C) 2012, Linden Research, Inc.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation;
 * version 2.1 of the License only.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
 * $/LicenseInfo$
 */

#include "httpcommon.h"

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


namespace LLCore
{

HttpStatus::type_enum_t EXT_CURL_EASY;
HttpStatus::type_enum_t EXT_CURL_MULTI;
HttpStatus::type_enum_t LLCORE;

HttpStatus::operator unsigned long() const
{
	static const int shift(sizeof(unsigned long) * 4);

	unsigned long result(((unsigned long) mType) << shift | (unsigned long) (int) mStatus);
	return result;
}


std::string HttpStatus::toHex() const
{
	std::ostringstream result;
	result.width(8);
	result.fill('0');
	result << std::hex << operator unsigned long();
	return result.str();
	
}

std::string HttpStatus::toString() const
{
	static const char * llcore_errors[] =
		{
			"",
			"HTTP error reply status",
			"Services shutting down",
			"Operation canceled",
			"Invalid Content-Range header encountered",
			"Request handle not found",
			"Invalid datatype for argument or option",
			"Option has not been explicitly set",
			"Option is not dynamic and must be set early"
		};
	static const int llcore_errors_count(sizeof(llcore_errors) / sizeof(llcore_errors[0]));

	static const struct
	{
		type_enum_t		mCode;
		const char *	mText;
	}
	http_errors[] =
		{
			// Keep sorted by mCode, we binary search this list.
			{ 100, "Continue" },
			{ 101, "Switching Protocols" },
			{ 200, "OK" },
			{ 201, "Created" },
			{ 202, "Accepted" },
			{ 203, "Non-Authoritative Information" },
			{ 204, "No Content" },
			{ 205, "Reset Content" },
			{ 206, "Partial Content" },
			{ 300, "Multiple Choices" },
			{ 301, "Moved Permanently" },
			{ 302, "Found" },
			{ 303, "See Other" },
			{ 304, "Not Modified" },
			{ 305, "Use Proxy" },
			{ 307, "Temporary Redirect" },
			{ 400, "Bad Request" },
			{ 401, "Unauthorized" },
			{ 402, "Payment Required" },
			{ 403, "Forbidden" },
			{ 404, "Not Found" },
			{ 405, "Method Not Allowed" },
			{ 406, "Not Acceptable" },
			{ 407, "Proxy Authentication Required" },
			{ 408, "Request Time-out" },
			{ 409, "Conflict" },
			{ 410, "Gone" },
			{ 411, "Length Required" },
			{ 412, "Precondition Failed" },
			{ 413, "Request Entity Too Large" },
			{ 414, "Request-URI Too Large" },
			{ 415, "Unsupported Media Type" },
			{ 416, "Requested range not satisfiable" },
			{ 417, "Expectation Failed" },
			{ 500, "Internal Server Error" },
			{ 501, "Not Implemented" },
			{ 502, "Bad Gateway" },
			{ 503, "Service Unavailable" },
			{ 504, "Gateway Time-out" },
			{ 505, "HTTP Version not supported" }
		};
	static const int http_errors_count(sizeof(http_errors) / sizeof(http_errors[0]));
	
	if (*this)
	{
		return std::string("");
	}
	switch (mType)
	{
	case EXT_CURL_EASY:
		return std::string(curl_easy_strerror(CURLcode(mStatus)));

	case EXT_CURL_MULTI:
		return std::string(curl_multi_strerror(CURLMcode(mStatus)));

	case LLCORE:
		if (mStatus >= 0 && mStatus < llcore_errors_count)
		{
			return std::string(llcore_errors[mStatus]);
		}
		break;

	default:
		if (isHttpStatus())
		{
			// Binary search for the error code and string
			int bottom(0), top(http_errors_count);
			while (true)
			{
				int at((bottom + top) / 2);
				if (mType == http_errors[at].mCode)
				{
					return std::string(http_errors[at].mText);
				}
				if (at == bottom)
				{
					break;
				}
				else if (mType < http_errors[at].mCode)
				{
					top = at;
				}
				else
				{
					bottom = at;
				}
			}
		}
		break;
	}
	return std::string("Unknown error");
}
		
} // end namespace LLCore