#ifndef MB_Time_H
#define MB_Time_H

#include "ESP_Mail_Client_Version.h"
#if !VALID_VERSION_CHECK(30409)
#error "Mixed versions compilation."
#endif

/*
 * Time helper class v1.0.7
 *
 * Created August 28, 2023
 *
 * Do not remove or modify this file as it required for AVR, ARM, SAMD devices and external client to work.
 *
 * The MIT License (MIT)
 * Copyright (c) 2022 K. Suwatchai (Mobizt)
 *
 *
 * Permission is hereby granted, free of charge, to any person returning a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
 * the Software, and to permit persons to whom the Software is furnished to do so,
 * subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

#include <Arduino.h>
#include "Networks_Provider.h"

#define ESP_TIME_DEFAULT_TS 1577836800
#define ESP_TIME_NON_TS -1000

#include <vector>
#include <string>

#if defined(ESP32) && !defined(ESP_ARDUINO_VERSION) /* ESP32 core < v2.0.x */
#include <sys/time.h>
#else
#include <time.h>
#endif

#if defined(ESP_MAIL_USE_PSRAM)
#define MB_STRING_USE_PSRAM
#endif

#include "MB_String.h"
#include "MB_MCU.h"

#if defined(ESP8266)
#include "user_interface.h"
#endif

#if defined(__AVR__) || defined(MB_ARDUINO_TEENSY)
#define MB_TIME_PGM_ATTR
#else
#define MB_TIME_PGM_ATTR PROGMEM
#endif

#if !defined(MB_ARDUINO_ESP)
static const char *mb_months[12] MB_TIME_PGM_ATTR = {"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
#endif

enum base_time_type_t
{
  base_time_type_undefined = -1,
  base_time_type_unset = 0,
  base_time_type_auto = 1,
  base_time_type_user = 2
};

class MB_Time
{
public:
  MB_Time()
  {
  }

  ~MB_Time()
  {
    clear();
  }

  void clear()
  {
#if defined(ENABLE_NTP_TIME)
    if (_sv1.length())
    {
      _sv1.clear();
      _sv2.clear();
      _sv3.clear();
    }
#endif
  }

  void readNTPTime(unsigned long waitMs, bool debugProgress)
  {
    if (!timeReady())
    {
      if (WiFI_CONNECTED)
      {

#if defined(ENABLE_NTP_TIME)
#if (defined(ESP32) || defined(ESP8266))
        configTime(_gmt_offset * 3600, _daylight_offset * 60, _sv1.c_str(), _sv2.c_str(), _sv3.c_str());
#elif defined(ARDUINO_RASPBERRY_PI_PICO_W)
        NTP.begin(_sv1.c_str(), _sv2.c_str());
        NTP.waitSet();
#endif
#endif
        unsigned long ms = millis();

#if !defined(SILENT_MODE)
        unsigned long pgms = 0;
#endif
        do
        {
#if defined(ESP_MAIL_HAS_WIFI_TIME)
          _base_ts = WiFi.getTime() > ESP_TIME_DEFAULT_TS ? WiFi.getTime() : _base_ts;
#elif defined(ENABLE_NTP_TIME)
          _base_ts = time(nullptr) > ESP_TIME_DEFAULT_TS ? time(nullptr) : _base_ts;
#else
          break;
#endif

#if !defined(SILENT_MODE)
          if (debugProgress && millis() - pgms > 50)
          {
            pgms = millis();
            esp_mail_debug_print(".", false);
          }
#endif

          yield_impl();
        } while (millis() - ms < waitMs && _base_ts < ESP_TIME_DEFAULT_TS);
#if !defined(SILENT_MODE)
        if (debugProgress)
          esp_mail_debug_print("", true);
#endif
      }
    }
  }

  int setTimestamp(time_t ts, float gmtOffset)
  {
    _gmt_offset = gmtOffset;
    _base_time_type = ts > ESP_TIME_DEFAULT_TS ? base_time_type_user : base_time_type_unset;
#if defined(MB_ARDUINO_ESP)
    struct timeval tm; // sec, us
    tm.tv_sec = ts;
    tm.tv_usec = 0;
    return settimeofday((const struct timeval *)&tm, 0);
#else
    _ts_offset = ts - millis() / 1000;
    return 1;
#endif
  }

  /** Get the timestamp from the year, month, date, hour, minute,
   * and second provided.
   *
   * @param year The year.
   * @param mon The month from 1 to 12.
   * @param date The dates.
   * @param hour The hours.
   * @param mins The minutes.
   * @param sec The seconds.
   * @return time_t The value of timestamp.
   */
  time_t getTimestamp(int year, int mon, int date, int hour, int mins, int sec)
  {
    struct tm timeinfo;
    timeinfo.tm_year = year - 1900;
    timeinfo.tm_mon = mon - 1;
    timeinfo.tm_mday = date;
    timeinfo.tm_hour = hour;
    timeinfo.tm_min = mins;
    timeinfo.tm_sec = sec;
    time_t ts = mktime(&timeinfo);
    return ts;
  }

  /** Get the timestamp from the RFC 2822 time string.
   * e.g. Mon, 02 May 2022 00:30:00 +0000 or 02 May 2022 00:30:00 +0000
   *
   * @param gmt Return the GMT time.
   * @return timestamp of time string.
   */
  time_t getTimestamp(const char *timeString, bool gmt = false)
  {
#if defined(MB_ARDUINO_ESP)
    struct tm timeinfo;

    if (strstr(timeString, ",") != NULL)
      strptime(timeString, "%a, %d %b %Y %H:%M:%S %z", &timeinfo);
    else
      strptime(timeString, "%d %b %Y %H:%M:%S %z", &timeinfo);

    time_t ts = mktime(&timeinfo);
    return ts;

#else

    time_t ts = 0;
    _vectorImpl<MB_String> tk;
    MB_String s1 = timeString;

    splitToken(s1, tk, ' ');
    int day = 0, mon = 0, year = 0, hr = 0, mins = 0, sec = 0, tz_h = 0, tz_m = 0;

    int tkindex = tk.size() == 5 ? -1 : 0; // No week days?

    // some response may include (UTC) and (ICT)
    if (tk.size() >= 5)
    {
      day = atoi(tk[tkindex + 1].c_str());
      for (size_t i = 0; i < 12; i++)
      {
        if (strcmp_P(mb_months[i], tk[tkindex + 2].c_str()) == 0)
          mon = i;
      }

      // RFC 822 year to RFC 2822
      if (tk[tkindex + 3].length() == 2)
        tk[tkindex + 3].prepend("20");

      year = atoi(tk[tkindex + 3].c_str());

      _vectorImpl<MB_String> tk2;
      splitToken(tk[tkindex + 4], tk2, ':');
      if (tk2.size() == 3)
      {
        hr = atoi(tk2[0].c_str());
        mins = atoi(tk2[1].c_str());
        sec = atoi(tk2[2].c_str());
      }

      ts = getTimestamp(year, mon + 1, day, hr, mins, sec);

      if (tk[tkindex + 5].length() == 5 && gmt)
      {
        char tmp[6];
        memset(tmp, 0, 6);
        strncpy(tmp, tk[tkindex + 5].c_str() + 1, 2);
        tz_h = atoi(tmp);

        memset(tmp, 0, 6);
        strncpy(tmp, tk[tkindex + 5].c_str() + 3, 2);
        tz_m = atoi(tmp);

        time_t tz = tz_h * 60 * 60 + tz_m * 60;
        if (tk[tkindex + 5][0] == '+')
          ts -= tz; // remove time zone offset
        else
          ts += tz;
      }
    }
    return ts;
#endif
  }

  /** Get the current timestamp.
   *
   * @return uint64_t The value of current timestamp.
   */
  uint64_t getCurrentTimestamp()
  {
    getBaseTime();
    return _base_ts;
  }

  /** Get the current rfc822 date time string that valid for Email.
   * @return String The current date time string.
   */
  String getDateTimeString()
  {
    getBaseTime();

    char tbuf[40];
    strftime(tbuf, 40, "%a, %d %b %Y %H:%M:%S %z", &_time_info);
    MB_String tStr = tbuf, tzStr;

    int p = _gmt_offset < 0 ? -1 : 1;
    float dif = (p * (_gmt_offset * 10 - (int)_gmt_offset * 10)) * 60.0 / 10;
    tzStr = (_gmt_offset < 0) ? '-' : '+';

    if ((int)_gmt_offset < 10)
      tzStr += 0;

    tzStr += (int)_gmt_offset;

    if (dif < 10)
      tzStr += 0;

    tzStr += (int)dif;

    // replace for valid timezone
    tStr.replaceAll("+0000", tzStr);
    return tStr.c_str();
  }

  String getDateTimeString(time_t ts, const char *format)
  {
    char tbuf[100];
    strftime(tbuf, 100, format, localtime(&ts));
    return tbuf;
  }

  void begin(float gmtOffset, float daylightOffset, const char *servers)
  {
    if (timeReady() && _base_time_type == base_time_type_undefined)
      _base_time_type = base_time_type_auto;
    else if (_base_time_type == base_time_type_undefined)
      _base_time_type = base_time_type_unset;

#if defined(ENABLE_NTP_TIME) && (defined(ESP32) || defined(ESP8266) || defined(ARDUINO_RASPBERRY_PI_PICO_W))

    _vectorImpl<MB_String> tk;
    MB_String sv = servers;

    clear();

    splitToken(sv, tk, ',');

    if (tk.size() > 0)
      _sv1 = tk[0];
    if (tk.size() > 1)
      _sv2 = tk[1];
    if (tk.size() > 2)
      _sv3 = tk[2];

#endif

    if ((gmtOffset > ESP_TIME_NON_TS && _gmt_offset != gmtOffset) || (daylightOffset > ESP_TIME_NON_TS && _daylight_offset != daylightOffset))
    {
      // Reset system timestamp when config changed
      _base_ts = 0;
      if (gmtOffset > ESP_TIME_NON_TS)
        _gmt_offset = gmtOffset;
      if (daylightOffset > ESP_TIME_NON_TS)
        _daylight_offset = daylightOffset;

      if (_base_time_type == base_time_type_unset)
        setTimestamp(millis(), _gmt_offset);
    }
  }

  /** get the clock ready state
   */
  bool timeReady()
  {
    getBaseTime();
    return _time_ready;
  }

private:
  time_t _base_ts = 0;
  struct tm _time_info;
  float _gmt_offset = ESP_TIME_NON_TS;
  float _daylight_offset = ESP_TIME_NON_TS;
  void splitToken(MB_String &str, _vectorImpl<MB_String> &tk, char delim)
  {
    size_t current, previous = 0;
    current = str.find(delim, previous);
    MB_String s;
    while (current != MB_String::npos)
    {

      s = str.substr(previous, current - previous);
      s.trim();

      if (s.length() > 0)
        tk.push_back(s);
      previous = current + 1;
      current = str.find(delim, previous);
    }

    s = str.substr(previous, current - previous);

    s.trim();

    if (s.length() > 0)
      tk.push_back(s);

    s.clear();
  }

  // 9Safe) Get base timestamp
  void getBaseTime()
  {

#if defined(ESP32) || defined(ESP8266) || defined(MB_ARDUINO_PICO)

    if (_base_ts < time(nullptr) && time(nullptr) > ESP_TIME_DEFAULT_TS)
      _base_ts = time(nullptr);

#if defined(ESP32)
    getLocalTime(&_time_info);
#elif defined(ESP8266) || defined(MB_ARDUINO_PICO)
    localtime_r(&_base_ts, &_time_info);
#endif

#elif defined(ESP_MAIL_HAS_WIFI_TIME)
    if (WiFI_CONNECTED)
      _base_ts = WiFi.getTime() > ESP_TIME_DEFAULT_TS ? WiFi.getTime() : _base_ts;
#else
    _base_ts = _ts_offset + millis() / 1000;
#endif

    _time_ready = _base_ts > ESP_TIME_DEFAULT_TS;
    if (_time_ready)
      _ts_offset = _base_ts - millis() / 1000;
  }

#if defined(ENABLE_NTP_TIME)
  // in ESP8266 these NTP sever strings should be existed during configuring time.
  MB_String _sv1, _sv2, _sv3;
#endif

  uint32_t _ts_offset = 0;
  bool _time_ready = false;
  base_time_type_t _base_time_type = base_time_type_undefined;
};

#endif // MB_Time_H