/**
 * @file       TinyGsmClientM590.h
 * @author     Volodymyr Shymanskyy
 * @license    LGPL-3.0
 * @copyright  Copyright (c) 2016 Volodymyr Shymanskyy
 * @date       Nov 2016
 */

#ifndef TinyGsmClientM590_h
#define TinyGsmClientM590_h
//#pragma message("TinyGSM:  TinyGsmClientM590")

//#define TINY_GSM_DEBUG Serial

#if !defined(TINY_GSM_RX_BUFFER)
  #define TINY_GSM_RX_BUFFER 256
#endif

#define TINY_GSM_MUX_COUNT 2

#include <TinyGsmCommon.h>

#define GSM_NL "\r\n"
static const char GSM_OK[] TINY_GSM_PROGMEM = "OK" GSM_NL;
static const char GSM_ERROR[] TINY_GSM_PROGMEM = "ERROR" GSM_NL;

enum SimStatus {
  SIM_ERROR = 0,
  SIM_READY = 1,
  SIM_LOCKED = 2,
};

enum RegStatus {
  REG_UNREGISTERED = 0,
  REG_SEARCHING    = 3,
  REG_DENIED       = 2,
  REG_OK_HOME      = 1,
  REG_OK_ROAMING   = 5,
  REG_UNKNOWN      = 4,
};


class TinyGsmM590
{

public:

class GsmClient : public Client
{
  friend class TinyGsmM590;
  typedef TinyGsmFifo<uint8_t, TINY_GSM_RX_BUFFER> RxFifo;

public:
  GsmClient() {}

  GsmClient(TinyGsmM590& modem, uint8_t mux = 1) {
    init(&modem, mux);
  }

  bool init(TinyGsmM590* modem, uint8_t mux = 1) {
    this->at = modem;
    this->mux = mux;
    sock_connected = false;

    at->sockets[mux] = this;

    return true;
  }

public:
  virtual int connect(const char *host, uint16_t port, int timeout_s) {
    stop();
    TINY_GSM_YIELD();
    rx.clear();
    sock_connected = at->modemConnect(host, port, mux, timeout_s);

    return sock_connected;
  }

TINY_GSM_CLIENT_CONNECT_OVERLOADS()

  virtual void stop() {
    TINY_GSM_YIELD();
    at->sendAT(GF("+TCPCLOSE="), mux);
    sock_connected = false;
    at->waitResponse();
    rx.clear();
  }

TINY_GSM_CLIENT_WRITE()

TINY_GSM_CLIENT_AVAILABLE_NO_MODEM_FIFO()

TINY_GSM_CLIENT_READ_NO_MODEM_FIFO()

TINY_GSM_CLIENT_PEEK_FLUSH_CONNECTED()

  /*
   * Extended API
   */

  String remoteIP() TINY_GSM_ATTR_NOT_IMPLEMENTED;

private:
  TinyGsmM590*    at;
  uint8_t         mux;
  bool            sock_connected;
  RxFifo          rx;
};


public:

  TinyGsmM590(Stream& stream)
    : stream(stream)
  {
    memset(sockets, 0, sizeof(sockets));
  }

  /*
   * Basic functions
   */

  bool begin(const char* pin = NULL) {
    return init(pin);
  }

  bool init(const char* pin = NULL) {
    DBG(GF("### TinyGSM Version:"), TINYGSM_VERSION);
    if (!testAT()) {
      return false;
    }
    sendAT(GF("&FZE0"));  // Factory + Reset + Echo Off
    if (waitResponse() != 1) {
      return false;
    }
#ifdef TINY_GSM_DEBUG
    sendAT(GF("+CMEE=2"));
    waitResponse();
#endif
    DBG(GF("### Modem:"), getModemName());
    getSimStatus();
    return true;
  }

  String getModemName() {
    return "Neoway M590";
  }

TINY_GSM_MODEM_SET_BAUD_IPR()

TINY_GSM_MODEM_TEST_AT()

TINY_GSM_MODEM_MAINTAIN_LISTEN()

  bool factoryDefault() {
    sendAT(GF("&FZE0&W"));  // Factory + Reset + Echo Off + Write
    waitResponse();
    sendAT(GF("+ICF=3,1")); // 8 data 0 parity 1 stop
    waitResponse();
    sendAT(GF("+ENPWRSAVE=0")); // Disable PWR save
    waitResponse();
    sendAT(GF("+XISP=0"));  // Use internal stack
    waitResponse();
    sendAT(GF("&W"));       // Write configuration
    return waitResponse() == 1;
  }

TINY_GSM_MODEM_GET_INFO_ATI()

  bool hasSSL() {
    return false;
  }

  bool hasWifi() {
    return false;
  }

  bool hasGPRS() {
    return true;
  }

  /*
   * Power functions
   */

  bool restart() {
    if (!testAT()) {
      return false;
    }
    sendAT(GF("+CFUN=15"));
    if (waitResponse(10000L) != 1) {
      return false;
    }
    //MODEM:STARTUP
    waitResponse(60000L, GF(GSM_NL "+PBREADY" GSM_NL));
    return init();
  }

  bool poweroff() {
    sendAT(GF("+CPWROFF"));
    return waitResponse(3000L) == 1;
  }

  bool radioOff() TINY_GSM_ATTR_NOT_IMPLEMENTED;

  bool sleepEnable(bool enable = true) {
    sendAT(GF("+ENPWRSAVE="), enable);
    return waitResponse() == 1;
  }

  /*
   * SIM card functions
   */

TINY_GSM_MODEM_SIM_UNLOCK_CPIN()

TINY_GSM_MODEM_GET_SIMCCID_CCID()

TINY_GSM_MODEM_GET_IMEI_GSN()

  SimStatus getSimStatus(unsigned long timeout_ms = 10000L) {
    for (unsigned long start = millis(); millis() - start < timeout_ms; ) {
      sendAT(GF("+CPIN?"));
      if (waitResponse(GF(GSM_NL "+CPIN:")) != 1) {
        delay(1000);
        continue;
      }
      int status = waitResponse(GF("READY"), GF("SIM PIN"), GF("SIM PUK"));
      waitResponse();
      switch (status) {
        case 2:
        case 3:  return SIM_LOCKED;
        case 1:  return SIM_READY;
        default: return SIM_ERROR;
      }
    }
    return SIM_ERROR;
  }

TINY_GSM_MODEM_GET_REGISTRATION_XREG(CREG)

TINY_GSM_MODEM_GET_OPERATOR_COPS()

  /*
   * Generic network functions
   */

TINY_GSM_MODEM_GET_CSQ()

  bool isNetworkConnected() {
    RegStatus s = getRegistrationStatus();
    return (s == REG_OK_HOME || s == REG_OK_ROAMING);
  }

TINY_GSM_MODEM_WAIT_FOR_NETWORK()

  /*
   * GPRS functions
   */

  bool gprsConnect(const char* apn, const char* user = NULL, const char* pwd = NULL) {
    gprsDisconnect();

    sendAT(GF("+XISP=0"));
    waitResponse();

    sendAT(GF("+CGDCONT=1,\"IP\",\""), apn, '"');
    waitResponse();

    if (!user) user = "";
    if (!pwd)  pwd = "";
    sendAT(GF("+XGAUTH=1,1,\""), user, GF("\",\""), pwd, GF("\""));
    waitResponse();

    sendAT(GF("+XIIC=1"));
    waitResponse();

    const unsigned long timeout_ms = 60000L;
    for (unsigned long start = millis(); millis() - start < timeout_ms; ) {
      if (isGprsConnected()) {
        //goto set_dns; // TODO
        return true;
      }
      delay(500);
    }
    return false;

// set_dns:  // TODO
//     sendAT(GF("+DNSSERVER=1,8.8.8.8"));
//     waitResponse();
//
//     sendAT(GF("+DNSSERVER=2,8.8.4.4"));
//     waitResponse();

    return true;
  }

  bool gprsDisconnect() {
    // TODO: There is no command in AT command set
    // XIIC=0 does not work
    return true;
  }

  bool isGprsConnected() {
    sendAT(GF("+XIIC?"));
    if (waitResponse(GF(GSM_NL "+XIIC:")) != 1) {
      return false;
    }
    int res = stream.readStringUntil(',').toInt();
    waitResponse();
    return res == 1;
  }

  /*
   * IP Address functions
   */

  String getLocalIP() {
    sendAT(GF("+XIIC?"));
    if (waitResponse(GF(GSM_NL "+XIIC:")) != 1) {
      return "";
    }
    stream.readStringUntil(',');
    String res = stream.readStringUntil('\n');
    waitResponse();
    res.trim();
    return res;
  }

  IPAddress localIP() {
    return TinyGsmIpFromString(getLocalIP());
  }

  /*
   * Phone Call functions
   */

  bool setGsmBusy(bool busy = true) TINY_GSM_ATTR_NOT_AVAILABLE;

  bool callAnswer() TINY_GSM_ATTR_NOT_AVAILABLE;

  bool callNumber(const String& number) TINY_GSM_ATTR_NOT_AVAILABLE;

  bool callHangup() TINY_GSM_ATTR_NOT_AVAILABLE;

  /*
   * Messaging functions
   */

  String sendUSSD(const String& code) {
    sendAT(GF("+CMGF=1"));
    waitResponse();
    sendAT(GF("+CSCS=\"HEX\""));
    waitResponse();
    sendAT(GF("D"), code);
    if (waitResponse(10000L, GF(GSM_NL "+CUSD:")) != 1) {
      return "";
    }
    stream.readStringUntil('"');
    String hex = stream.readStringUntil('"');
    stream.readStringUntil(',');
    int dcs = stream.readStringUntil('\n').toInt();

    if (waitResponse() != 1) {
      return "";
    }

    if (dcs == 15) {
      return TinyGsmDecodeHex8bit(hex);
    } else if (dcs == 72) {
      return TinyGsmDecodeHex16bit(hex);
    } else {
      return hex;
    }
  }

  bool sendSMS(const String& number, const String& text) {
    sendAT(GF("+CSCS=\"GSM\""));
    waitResponse();
    sendAT(GF("+CMGF=1"));
    waitResponse();
    sendAT(GF("+CMGS=\""), number, GF("\""));
    if (waitResponse(GF(">")) != 1) {
      return false;
    }
    stream.print(text);
    stream.write((char)0x1A);
    stream.flush();
    return waitResponse(60000L) == 1;
  }

  bool sendSMS_UTF16(const String& number, const void* text, size_t len)
  TINY_GSM_ATTR_NOT_AVAILABLE;

  /*
   * Location functions
   */

  String getGsmLocation() TINY_GSM_ATTR_NOT_AVAILABLE;

  /*
   * Battery & temperature functions
   */

  uint16_t getBattVoltage() TINY_GSM_ATTR_NOT_AVAILABLE;
  int8_t getBattPercent() TINY_GSM_ATTR_NOT_AVAILABLE;
  uint8_t getBattChargeState() TINY_GSM_ATTR_NOT_AVAILABLE;
  bool getBattStats(uint8_t &chargeState, int8_t &percent, uint16_t &milliVolts) TINY_GSM_ATTR_NOT_AVAILABLE;
  float getTemperature() TINY_GSM_ATTR_NOT_AVAILABLE;

  /*
   * Client related functions
   */

protected:

  bool modemConnect(const char* host, uint16_t port, uint8_t mux, int timeout_s = 75) {
    uint32_t timeout_ms = ((uint32_t)timeout_s)*1000;
    for (int i=0; i<3; i++) { // TODO: no need for loop?
      String ip = dnsIpQuery(host);

      sendAT(GF("+TCPSETUP="), mux, GF(","), ip, GF(","), port);
      int rsp = waitResponse(timeout_ms,
                            GF(",OK" GSM_NL),
                            GF(",FAIL" GSM_NL),
                            GF("+TCPSETUP:Error" GSM_NL));
      if (1 == rsp) {
        return true;
      } else if (3 == rsp) {
        sendAT(GF("+TCPCLOSE="), mux);
        waitResponse();
      }
      delay(1000);
    }
    return false;
  }

  int16_t modemSend(const void* buff, size_t len, uint8_t mux) {
    sendAT(GF("+TCPSEND="), mux, ',', len);
    if (waitResponse(GF(">")) != 1) {
      return 0;
    }
    stream.write((uint8_t*)buff, len);
    stream.write((char)0x0D);
    stream.flush();
    if (waitResponse(30000L, GF(GSM_NL "+TCPSEND:")) != 1) {
      return 0;
    }
    stream.readStringUntil('\n');
    return len;
  }

  bool modemGetConnected(uint8_t mux) {
    sendAT(GF("+CIPSTATUS="), mux);
    int res = waitResponse(GF(",\"CONNECTED\""), GF(",\"CLOSED\""), GF(",\"CLOSING\""), GF(",\"INITIAL\""));
    waitResponse();
    return 1 == res;
  }

  String dnsIpQuery(const char* host) {
    sendAT(GF("+DNS=\""), host, GF("\""));
    if (waitResponse(10000L, GF(GSM_NL "+DNS:")) != 1) {
      return "";
    }
    String res = stream.readStringUntil('\n');
    waitResponse(GF("+DNS:OK" GSM_NL));
    res.trim();
    return res;
  }

public:

  /*
   Utilities
   */

TINY_GSM_MODEM_STREAM_UTILITIES()

  // TODO: Optimize this!
  uint8_t waitResponse(uint32_t timeout_ms, String& data,
                       GsmConstStr r1=GFP(GSM_OK), GsmConstStr r2=GFP(GSM_ERROR),
                       GsmConstStr r3=NULL, GsmConstStr r4=NULL, GsmConstStr r5=NULL)
  {
    /*String r1s(r1); r1s.trim();
    String r2s(r2); r2s.trim();
    String r3s(r3); r3s.trim();
    String r4s(r4); r4s.trim();
    String r5s(r5); r5s.trim();
    DBG("### ..:", r1s, ",", r2s, ",", r3s, ",", r4s, ",", r5s);*/
    data.reserve(64);
    int index = 0;
    unsigned long startMillis = millis();
    do {
      TINY_GSM_YIELD();
      while (stream.available() > 0) {
        int a = stream.read();
        if (a <= 0) continue; // Skip 0x00 bytes, just in case
        data += (char)a;
        if (r1 && data.endsWith(r1)) {
          index = 1;
          goto finish;
        } else if (r2 && data.endsWith(r2)) {
          index = 2;
          goto finish;
        } else if (r3 && data.endsWith(r3)) {
          index = 3;
          goto finish;
        } else if (r4 && data.endsWith(r4)) {
          index = 4;
          goto finish;
        } else if (r5 && data.endsWith(r5)) {
          index = 5;
          goto finish;
        } else if (data.endsWith(GF("+TCPRECV:"))) {
          int mux = stream.readStringUntil(',').toInt();
          int len = stream.readStringUntil(',').toInt();
          int len_orig = len;
          if (len > sockets[mux]->rx.free()) {
            DBG("### Buffer overflow: ", len, "->", sockets[mux]->rx.free());
          } else {
            DBG("### Got: ", len, "->", sockets[mux]->rx.free());
          }
          while (len--) {
            TINY_GSM_MODEM_STREAM_TO_MUX_FIFO_WITH_DOUBLE_TIMEOUT
          }
          if (len_orig > sockets[mux]->available()) { // TODO
            DBG("### Fewer characters received than expected: ", sockets[mux]->available(), " vs ", len_orig);
          }
          data = "";
        } else if (data.endsWith(GF("+TCPCLOSE:"))) {
          int mux = stream.readStringUntil(',').toInt();
          stream.readStringUntil('\n');
          if (mux >= 0 && mux < TINY_GSM_MUX_COUNT) {
            sockets[mux]->sock_connected = false;
          }
          data = "";
          DBG("### Closed: ", mux);
        }
      }
    } while (millis() - startMillis < timeout_ms);
finish:
    if (!index) {
      data.trim();
      if (data.length()) {
        DBG("### Unhandled:", data);
      }
      data = "";
    }
    //DBG('<', index, '>');
    return index;
  }

  uint8_t waitResponse(uint32_t timeout_ms,
                       GsmConstStr r1=GFP(GSM_OK), GsmConstStr r2=GFP(GSM_ERROR),
                       GsmConstStr r3=NULL, GsmConstStr r4=NULL, GsmConstStr r5=NULL)
  {
    String data;
    return waitResponse(timeout_ms, data, r1, r2, r3, r4, r5);
  }

  uint8_t waitResponse(GsmConstStr r1=GFP(GSM_OK), GsmConstStr r2=GFP(GSM_ERROR),
                       GsmConstStr r3=NULL, GsmConstStr r4=NULL, GsmConstStr r5=NULL)
  {
    return waitResponse(1000, r1, r2, r3, r4, r5);
  }

public:
  Stream&       stream;

protected:
  GsmClient*    sockets[TINY_GSM_MUX_COUNT];
};

#endif