/**
 * @file WebSocketsClient.h
 * @date 20.05.2015
 * @author Markus Sattler
 *
 * Copyright (c) 2015 Markus Sattler. All rights reserved.
 * This file is part of the WebSockets for Arduino.
 *
 * 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; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * 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 St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 */

#ifndef ESP_WEBSOCKETSCLIENT_H_
#define ESP_WEBSOCKETSCLIENT_H_

#include "WebSockets.h"

class WebSocketsClient : protected WebSockets {
  public:
    typedef std::function<void(WStype_t type, uint8_t * payload, size_t length)> WebSocketClientEvent;

    WebSocketsClient(void);
    virtual ~WebSocketsClient(void);

    void begin(const char * host, uint16_t port, const char * url = "/", const char * protocol = "arduino");
    void begin(String host, uint16_t port, String url = "/", String protocol = "arduino");
    void begin(IPAddress host, uint16_t port, const char * url = "/", const char * protocol = "arduino");

#if defined(HAS_SSL)
#ifdef SSL_AXTLS
    void beginSSL(const char * host, uint16_t port, const char * url = "/", const char * fingerprint = "", const char * protocol = "arduino");
    void beginSSL(String host, uint16_t port, String url = "/", String fingerprint = "", String protocol = "arduino");
#else
    void beginSSL(const char * host, uint16_t port, const char * url = "/", const uint8_t * fingerprint = NULL, const char * protocol = "arduino");
    void beginSslWithCA(const char * host, uint16_t port, const char * url = "/", BearSSL::X509List * CA_cert = NULL, const char * protocol = "arduino");
    void setSSLClientCertKey(BearSSL::X509List * clientCert = NULL, BearSSL::PrivateKey * clientPrivateKey = NULL);
    void setSSLClientCertKey(const char * clientCert = NULL, const char * clientPrivateKey = NULL);
#endif
    void beginSslWithCA(const char * host, uint16_t port, const char * url = "/", const char * CA_cert = NULL, const char * protocol = "arduino");
#endif

    void beginSocketIO(const char * host, uint16_t port, const char * url = "/socket.io/?EIO=3", const char * protocol = "arduino");
    void beginSocketIO(String host, uint16_t port, String url = "/socket.io/?EIO=3", String protocol = "arduino");

#if defined(HAS_SSL)
    void beginSocketIOSSL(const char * host, uint16_t port, const char * url = "/socket.io/?EIO=3", const char * protocol = "arduino");
    void beginSocketIOSSL(String host, uint16_t port, String url = "/socket.io/?EIO=3", String protocol = "arduino");

    void beginSocketIOSSLWithCA(const char * host, uint16_t port, const char * url = "/socket.io/?EIO=3", const char * CA_cert = NULL, const char * protocol = "arduino");
#if defined(SSL_BARESSL)
    void beginSocketIOSSLWithCA(const char * host, uint16_t port, const char * url = "/socket.io/?EIO=3", BearSSL::X509List * CA_cert = NULL, const char * protocol = "arduino");
#endif
#endif

    void onEvent(WebSocketClientEvent cbEvent);

    bool sendTXT(uint8_t * payload, size_t length = 0, bool headerToPayload = false);
    bool sendTXT(const uint8_t * payload, size_t length = 0);
    bool sendTXT(char * payload, size_t length = 0, bool headerToPayload = false);
    bool sendTXT(const char * payload, size_t length = 0);
    bool sendTXT(String & payload);
    bool sendTXT(char payload);

    bool sendBIN(uint8_t * payload, size_t length, bool headerToPayload = false);
    bool sendBIN(const uint8_t * payload, size_t length);

    bool sendPing(uint8_t * payload = NULL, size_t length = 0);
    bool sendPing(String & payload);

    void disconnect(void);

    void setAuthorization(const char * user, const char * password);
    void setAuthorization(const char * auth);

    void setExtraHeaders(const char * extraHeaders = NULL);
    void setReconnectInterval(unsigned long time);

    void enableHeartbeat(uint32_t pingInterval, uint32_t pongTimeout, uint8_t disconnectTimeoutCount);
    void disableHeartbeat();

    bool isConnected(void);

  protected:
    String _host;
    uint16_t _port;

#if defined(HAS_SSL)
#ifdef SSL_AXTLS
    String _fingerprint;
    const char * _CA_cert;
#define SSL_FINGERPRINT_IS_SET (_fingerprint.length())
#define SSL_FINGERPRINT_NULL ""
#else
    const uint8_t * _fingerprint;
    BearSSL::X509List * _CA_cert;
    BearSSL::X509List * _client_cert;
    BearSSL::PrivateKey * _client_key;
#define SSL_FINGERPRINT_IS_SET (_fingerprint != NULL)
#define SSL_FINGERPRINT_NULL NULL
#endif

#endif
    WSclient_t _client;

    WebSocketClientEvent _cbEvent;

    unsigned long _lastConnectionFail;
    unsigned long _reconnectInterval;
    unsigned long _lastHeaderSent;

    void messageReceived(WSclient_t * client, WSopcode_t opcode, uint8_t * payload, size_t length, bool fin);
    void clientDisconnect(WSclient_t * client);
    bool clientIsConnected(WSclient_t * client);
    void handleClientData(void);
    void sendHeader(WSclient_t * client);
    void handleHeader(WSclient_t * client, String * headerLine);
    void connectFailedCb();
    void handleHBPing();    // send ping in specified intervals

    void loop(void);
    void connectedCb();

    /**
     * called for sending a Event to the app
     * @param type WStype_t
     * @param payload uint8_t *
     * @param length size_t
     */
    virtual void runCbEvent(WStype_t type, uint8_t * payload, size_t length) {
        if(_cbEvent) {
            _cbEvent(type, payload, length);
        }
    }
};

#endif /* WEBSOCKETSCLIENT_H_ */
