WebSocketClient.h

#pragma once
#ifndef LightWSClient_include_WebSocketClient_H_
#define LightWSClient_include_WebSocketClient_H_
#include <string>
#include <vector>
#include <functional>
using std::vector;
using std::string;

namespace cyanray
{
	class WebSocketClient
	{
	public:
		template<typename T>
		using Callback = std::function<void(WebSocketClient&, T)>;

		enum class Status
		{
			Open, Closing, Closed
		};

		WebSocketClient();
		WebSocketClient(const WebSocketClient&) = delete;
		WebSocketClient& operator=(const WebSocketClient&) = delete;
		~WebSocketClient();

		/**
		 * @brief Get status.
		 * @return WebSocketClient::Status
		*/
		Status GetStatus() const { return status; }

		/**
		 * @brief Connect by websocket uri.
		 * @param ws_uri e.g "ws://hostname[:port][/path/path][?query=value]"
		*/
		void Connect(const string& ws_uri);

		/**
		 * @brief Connect by hostname, port and path
		 * @param hostname e.g "localhost" or "example.com"
		 * @param port e.g 80
		 * @param path e.g "/chat?id=1234"
		*/
		void Connect(const string& hostname, int port, const string& path = "/");

		/**
		 * @brief Abort the connection and close tcp socket.
		*/
		void Shutdown();

		/**
		 * @brief After receving text data, the callback function will be called.
		 * @param callback Callback funtion.
		*/
		void OnTextReceived(Callback<string> callback);

		/**
		 * @brief After receving binary data, the callback function will be called.
		 * @param callback Callback funtion.
		*/
		void OnBinaryReceived(Callback<vector<uint8_t>> callback);

		/**
		 * @brief If an error occurs during the receiving process (such as a wrong frame), 
				  this function will be called.
		 * @param callback Callback funtion.
		*/
		void OnError(Callback<string> callback);

		/**
		 * @brief If tcp connection aborted or received close frame, 
		 *		  the callback function will be called.
		 * @param callback Callback funtion.
		*/
		void OnLostConnection(Callback<int> callback);

		/**
		 * @brief Send text data.
		 * @param text Text data.
		*/
		void SendText(const string& text);

		/**
		 * @brief Send binary data.
		 * @param data Binary data.
		 * @param length Length of the binary data.
		*/
		void SendBinary(const char* data, size_t length);

		/**
		 * @brief Send binary data.
		 * @param data Binary data.
		 * @param length Length of the binary data.
		*/
		void SendBinary(const uint8_t* data, size_t length);

		/**
		 * @brief Send ping frame.
		*/
		void Ping();

		/**
		 * @brief Send pong frame.
		*/
		void Pong();

		/**
		 * @brief Send pong frame.
		 * @param ping data
		*/
		void Pong(const vector<uint8_t>& data);

		/**
		 * @brief Send a close frame. 
				  If websocket server response a close frame, 
				  will close tcp socket.
		*/
		void Close();
	private:
		void RecvLoop();
		Callback<string> TextReceivedCallback;
		Callback<vector<uint8_t>> BinaryReceivedCallback;
		Callback<string> ErrorCallback;
		Callback<int> LostConnectionCallback;
		Status status;
		// avoid including implementation-related headers.
		struct pimpl;
		pimpl* PrivateMembers;
	};
}


#endif // !LightWSClient_include_WebSocketClient_H_