//
//	HttpReq.h
//
//	HTTP request functions.
//	Used by Scraper, GamesDBJSONScraper, GamesDBJSONScraperResources and
//	ScreenScraper to download game information and media files.
//

#pragma once
#ifndef ES_CORE_HTTP_REQ_H
#define ES_CORE_HTTP_REQ_H

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

// Usage:
// HttpReq myRequest("www.duckduckgo.com", "/index.html");
//
// For blocking behavior:
// while (myRequest.status() == HttpReq::REQ_IN_PROGRESS);
//
// For non-blocking behavior:
// Check 'if(myRequest.status() != HttpReq::REQ_IN_PROGRESS)' in some sort of update method.
//
// Once one of those calls complete, the request is ready.
//
// Do something like this to capture errors:
// if(myRequest.status() != REQ_SUCCESS) {
//    // An error occured.
//    LOG(LogError) << "HTTP request error - " << myRequest.getErrorMessage();
//    return;
// }
//
// This is how to read the returned content:
// std::string content = myRequest.getContent();

class HttpReq
{
public:
	HttpReq(const std::string& url);

	~HttpReq();

	enum Status {
		REQ_IN_PROGRESS,		// Request is in progress.
		REQ_SUCCESS,			// Request completed successfully, get it with getContent().

		REQ_IO_ERROR,			// Some error happened, get it with getErrorMsg().
		REQ_BAD_STATUS_CODE,	// Some invalid HTTP response status code happened (non-200).
		REQ_INVALID_RESPONSE	// The HTTP response was invalid.
	};

	Status status(); // Process any received data and return the status afterwards.

	std::string getErrorMsg();

	std::string getContent() const; // mStatus must be REQ_SUCCESS.

	static std::string urlEncode(const std::string &s);
	static bool isUrl(const std::string& s);

private:
	static size_t write_content(void* buff, size_t size, size_t nmemb, void* req_ptr);
	//static int update_progress(void* req_ptr, double dlTotal, double dlNow,
	//		double ulTotal, double ulNow);

	// God dammit libcurl why can't you have some way to check the status of an
	// individual handle why do I have to handle ALL messages at once.
	static std::map<CURL*, HttpReq*> s_requests;

	static CURLM* s_multi_handle;

	void onError(const char* msg);

	CURL* mHandle;

	Status mStatus;

	std::stringstream mContent;
	std::string mErrorMsg;
};

#endif // ES_CORE_HTTP_REQ_H