// Use from 0 to 4. Higher number, more debugging messages and memory usage.
#define _WIFIMGR_LOGLEVEL_  1
#define DEBUG               1

#include <WiFi.h>
#include <WiFiManager.h>
#include "debug.h"
#include <Arduino.h>
#include <ESPmDNS.h>
#include <LiquidCrystal_I2C.h>
#include <looper.h>
#include <RunningMedian.h>
#include <ESPDateTime.h>

#define MDNS_NAME             "wlanthermometer"
#define AP_SSID_CONFIG_NAME   "WLANTHERMOMETER-Config"
#define AP_CONFIG_PASSWORD    "wlanthermometer"
#define AP_DATA_RESET_PIN     35
#define TEMP_SENS_PIN         34
#define LCD_I2C_ADDR          0x3f
#define LCD_COL               20
#define LCD_ROW               4
#define KRATE_TEMP            5000
#define KRATE_TIME            500
#define MEDIAN_SAMPLES        60

void check_mode(void);

LiquidCrystal_I2C lcd(LCD_I2C_ADDR, LCD_COL, LCD_ROW);
looper sched;
RunningMedian samples = RunningMedian(MEDIAN_SAMPLES);
float temp_min = (analogRead(TEMP_SENS_PIN) / 2048.0) * 330.0;
float temp_max = temp_min;

void setup()
{
  pinMode(AP_DATA_RESET_PIN, INPUT_PULLUP);

  Serial.begin(115200);
  Serial.println(F("WLANThermometer (c)2020 H. Wirtz <wirtz@parasitstudio.de>"));

  lcd.init();
  lcd.backlight();
  lcd.clear();
  lcd.noCursor();
  lcd.setCursor(0, 0);
  lcd.print(F("WLAN THERMOMETER"));
  lcd.setCursor(0, 1);
  lcd.print(F("(c)parasiTstudio"));
  delay(1000);

  DEBUG_MSG("Mode Client\n");

  WiFi.mode(WIFI_STA); // explicitly set mode, esp defaults to STA+AP

  WiFiManager wm;

  if (digitalRead(AP_DATA_RESET_PIN) != LOW)
  {
    wm.resetSettings();
    DEBUG_MSG("Resetting AP data\n");
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print(F("Resetting AP data"));
    delay(2000);
  }

  // Automatically connect using saved credentials,
  // if connection fails, it starts an access point with the specified name ( "AutoConnectAP"),
  // if empty will auto generate SSID, if password is blank it will be anonymous AP (wm.autoConnect())
  // then goes into a blocking loop awaiting configuration and will return success result

  lcd.clear();
  lcd.setCursor(0, 3);
  lcd.print(F("Mode Config-AP"));
  lcd.setCursor(0, 4);
  lcd.print(F("192.168.4.1"));

  if (!wm.autoConnect(AP_SSID_CONFIG_NAME, AP_CONFIG_PASSWORD))
  {
    DEBUG_MSG("Failed to connect\n");
    lcd.setCursor(0, 4);
    lcd.print(F("Failed              "));
    delay(1000);
    lcd.setCursor(8, 4);
    lcd.print(F("- restart"));
    delay(1000);
    ESP.restart();
  }
  else {
    //if you get here you have connected to the WiFi
    DEBUG_MSG("Connected\n");


    if (!MDNS.begin(MDNS_NAME))
    {
      DEBUG_MSG("Error setting up MDNS responder!\n");
    }
    else
    {
      DEBUG_MSG("mDNS started.\n");
    }

    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print(F("Mode WiFi client"));
    lcd.setCursor(0, 1);
    lcd.print(WiFi.localIP());

    delay(500);
  }

  DateTime.setTimeZone(2);
  DateTime.begin();
  if (!DateTime.isTimeValid()) {
    Serial.println("Failed to get time from server.");
  }

  sched.addJob(show_temperature, KRATE_TEMP);
  sched.addJob(show_time, KRATE_TIME);

  lcd.clear();
  show_time();
  show_temperature();
}

void loop()
{
  sched.scheduler();
}

void show_time(void)
{
  DateTimeParts p = DateTime.getParts();
  char dt[21];

  Serial.println(DateTime.format(DateFormatter::DATE_ONLY));
  Serial.println(DateTime.format(DateFormatter::TIME_ONLY));

  sprintf(dt, "%02d.%02d.%4d  %02d:%02d:%02d", p.getMonthDay(), p.getMonth() + 1, p.getYear(), p.getHours(), p.getMinutes(), p.getSeconds());
  lcd.setCursor(0, 0);
  lcd.print(dt);
}

void show_temperature(void)
{
  float temp = (analogRead(TEMP_SENS_PIN) / 2048.0) * 330.0;

  Serial.println(temp, 1);

  samples.add(temp);

  if (samples.getLowest() < temp_min)
    temp_min = samples.getLowest();
  if (samples.getHighest() > temp_max)
    temp_max = samples.getHighest();

  lcd.setCursor(0, 1);
  lcd.print("Temperatur: ");
  lcd.print(temp);
  lcd.setCursor(0, 2);
  lcd.print("Minimum:    ");
  lcd.print(temp_min);
  lcd.setCursor(0, 3);
  lcd.print("Maximum:    ");
  lcd.print(temp_max);
}