/****************************************************************************************************************************
  RingBuffer.cpp - Dead simple web-server.
  For any WiFi shields, such as WiFiNINA W101, W102, W13x, or custom, such as ESP8266/ESP32-AT, Ethernet, etc

  WiFiWebServer is a library for the ESP32-based WiFi shields to run WebServer
  Forked and modified from ESP8266 https://github.com/esp8266/Arduino/releases
  Forked and modified from Arduino WiFiNINA library https://www.arduino.cc/en/Reference/WiFiNINA
  Built by Khoi Hoang https://github.com/khoih-prog/WiFiWebServer
  Licensed under MIT license

  Original author:
  @file       Esp8266WebServer.h
  @author     Ivan Grokhotkov

  Version: 1.10.1

  Version Modified By   Date      Comments
  ------- -----------  ---------- -----------
  1.0.0   K Hoang      12/02/2020 Initial coding for SAMD21, Nano 33 IoT, etc running WiFiNINA
  ...
  1.6.0   K Hoang      13/02/2022 Add support to new ESP32-S3 and ESP32_C3
  1.6.1   K Hoang      13/02/2022 Fix v1.6.0 issue
  1.6.2   K Hoang      22/02/2022 Add support to megaAVR using Arduino megaAVR core
  1.6.3   K Hoang      02/03/2022 Fix decoding error bug
  1.7.0   K Hoang      05/04/2022 Fix issue with Portenta_H7 core v2.7.2+
  1.8.0   K Hoang      26/04/2022 Add WiFiMulti library support and examples
  1.9.0   K Hoang      12/08/2022 Add support to RASPBERRY_PI_PICO_W using CYW4343 WiFi
  1.9.1   K Hoang      13/08/2022 Add WiFiMulti support to RASPBERRY_PI_PICO_W using CYW4343 WiFi
  1.9.2   K Hoang      16/08/2022 Workaround for RP2040W WiFi.status() bug
  1.9.3   K Hoang      16/08/2022 Better workaround for RP2040W WiFi.status() bug using ping() to local gateway
  1.9.4   K Hoang      06/09/2022 Restore support to ESP32 and ESP8266
  1.9.5   K Hoang      10/09/2022 Restore support to Teensy, etc. Fix bug in examples
  1.10.0  K Hoang      13/11/2022 Add new features, such as CORS. Update code and examples
  1.10.1  K Hoang      24/11/2022 Using new WiFi101_Generic library to send larger data
 *****************************************************************************************************************************/

#include "RingBuffer.h"

#include <Arduino.h>

////////////////////////////////////////

WiFi_RingBuffer::WiFi_RingBuffer(unsigned int size)
{
  _size = size;
  // add one char to terminate the string
  ringBuf = new char[size + 1];
  ringBufEnd = &ringBuf[size];
  init();
}

////////////////////////////////////////

WiFi_RingBuffer::~WiFi_RingBuffer() {}

////////////////////////////////////////

void WiFi_RingBuffer::reset()
{
  ringBufP = ringBuf;
}

////////////////////////////////////////

void WiFi_RingBuffer::init()
{
  ringBufP = ringBuf;
  memset(ringBuf, 0, _size + 1);
}

////////////////////////////////////////

void WiFi_RingBuffer::push(char c)
{
  *ringBufP = c;
  ringBufP++;

  if (ringBufP >= ringBufEnd)
    ringBufP = ringBuf;
}

////////////////////////////////////////

bool WiFi_RingBuffer::endsWith(const char* str)
{
  int findStrLen = strlen(str);

  // b is the start position into the ring buffer
  char* b = ringBufP - findStrLen;

  if (b < ringBuf)
    b = b + _size;

  char *p1 = (char*)&str[0];
  char *p2 = p1 + findStrLen;

  for (char *p = p1; p < p2; p++)
  {
    if (*p != *b)
      return false;

    b++;

    if (b == ringBufEnd)
      b = ringBuf;
  }

  return true;
}

////////////////////////////////////////

void WiFi_RingBuffer::getStr(char * destination, unsigned int skipChars)
{
  unsigned int len = ringBufP - ringBuf - skipChars;

  // copy buffer to destination string
  strncpy(destination, ringBuf, len);

  // terminate output string
  //destination[len]=0;
}

////////////////////////////////////////

void WiFi_RingBuffer::getStrN(char * destination, unsigned int skipChars, unsigned int num)
{
  unsigned int len = ringBufP - ringBuf - skipChars;

  if (len > num)
    len = num;

  // copy buffer to destination string
  strncpy(destination, ringBuf, len);

  // terminate output string
  //destination[len]=0;
}