/* --------------------- CONFIG ---------------------------------- */
/* Adapt this sketch to your needs by modifying the config_device.h*/
/* --------------------- GPIO ------------------------------------ */
/* Generic GPIO Control by HTTP REST interface                     */
/* Modify GPIO by accessing DEVICE_IP/gpio?gpio=[GPIO]&value=[0|1] */
/* -------------------- SETUP ------------------------------------ */
/* At first boot it creates a WiFi access point                    */
/*  and provide a web server on it, so you can configure Wifi ssid */
/*  Wifi passwd, and a mDNS HOSTNAME and a mqtt server             */
/* In this mode, device will be available at 192.168.4.1           */
/* --------------------- OTA ------------------------------------- */
/* Device can also be put in OTA Mode: In this case, if you have   */
/*  a little flash (512K), it better to disable SPIFFS in          */
/*  "Flash Size" Menu to save some place for the sketch to upload  */
/*  Use espota.py to upload OTA                                    */
/* After passing in OTA mode, next boot will be in setup mode      */
/* --------------------- BMP180 -----------------------------------*/
/* if BMP180 is available temperature will be published by mqtt    */
/* and on web server interface                                     */
/* --------------------- MQTT ------------------------------------ */
/* Send information to mqtt server configured in the setup mode    */
/* GPIO value configured in config_device.h can be get by          */
/* subscribing to /feeds/[HOSTNAME]/gpio/[GPIO] and modified by    */
/* publishing to  /feeds/[HOSTNAME]/gpio/[GPIO]/set                */
/* BMP180 will be published to /feeds/[HOSTNAME]/temperature and   */
/* /feeds/[HOSTNAME]/pressure                                      */




#include <ESP8266WiFi.h>
#include <WiFiClient.h>
#include <ESP8266WebServer.h>
#include <ESP8266mDNS.h>
#include <EEPROM.h>
#include <ArduinoOTA.h>
#include <errno.h>
#include "config.h"

#include "debug_sketch.h"
#include "BMP180.h"

#include "Adafruit_MQTT.h"
#include "Adafruit_MQTT_Client.h"

#define CONFIG_EEPROM_SIZE 256
char eeprom[CONFIG_EEPROM_SIZE];

#define BOOTMODE_SETUP  0
#define BOOTMODE_NORMAL 1
#define BOOTMODE_OTA    2

double temp, pressure;
uint8_t mode;
char *hostName = "";

/* Set these to your desired credentials. */
const char *ssid = CONFIG_SSID_NAME;

ESP8266WebServer server(80);

/* WebServer decl*/
void WebHandleRoot();
void WebHandleSetup();
void WebHandleGpio();
void WebHandleSave();
void WebHandleOTA();
void WebHandleNotFound();
void WebSetupServer(int bootmode);

/* EEPROM decl */
int EepromSaveConfig(uint8_t bootMode, String ssid, String password, String host, String mqttServer, String mqttUser, String mqttpasswd, int mqttPort);
int EepromSaveBootMode(uint8_t bootMode);
void EepromReadConfig(uint8_t &bootMode, char **ssid, char **password, char **host, char **mqttServer, char **mqttUser, char **mqttPasswd, int &mqttPort);

/* MQTT decl */
int MqttConnect();
int MqttIsConnected();
int MqttSetup(char *server, char *user, char *passwd, int port, char * hostname);
int MqttPublish(double temp, double pressure);
void MqttCheckSubscription();
void MqttChangeGpioValue(int gpio, int value);

void WifiSetup(int bootmode, int forceSetup, char *confSsid, char *confPassword, char *confHost) {
  IPAddress myIP;
  if (bootmode == BOOTMODE_SETUP || forceSetup) {
    SKETCH_DEBUG_PRINTLN("Configuring access point...");
    /* You can set a password to the AP here */
    WiFi.softAP(ssid);
    myIP = WiFi.softAPIP();
  } else {
    SKETCH_DEBUG_PRINTLN("Connecting to Wifi...");
    WiFi.begin(confSsid, confPassword);
    while (WiFi.status() != WL_CONNECTED) {
      delay(500);
      SKETCH_DEBUG_PRINT(".");
    }
    SKETCH_DEBUG_PRINTLN("");
    SKETCH_DEBUG_PRINTLN("WiFi connected");

    if (!MDNS.begin(confHost)) {
      SKETCH_DEBUG_PRINTLN("Error setting up MDNS responder!");
      while (1) {
        delay(1000);
      }
    }
    SKETCH_DEBUG_PRINTLN("mDNS responder started");
    myIP = WiFi.localIP();
  }

  SKETCH_DEBUG_PRINT("My IP address: ");
  SKETCH_DEBUG_PRINTLN(myIP);
}

void OTASetup() {
  // Port defaults to 8266
  // ArduinoOTA.setPort(8266);

  // Hostname defaults to esp8266-[ChipID]
  // ArduinoOTA.setHostname("myesp8266");

  // No authentication by default
  // ArduinoOTA.setPassword((const char *)"123");

  //Disable OTA mode to avoid forever loop
  //Force BOOTMODE_SETUP in case eeprom layout have changed
  EepromSaveBootMode(BOOTMODE_SETUP);

  ArduinoOTA.onStart([]() {
    SKETCH_DEBUG_PRINTLN("Start");
  });
  ArduinoOTA.onEnd([]() {
    SKETCH_DEBUG_PRINTLN("\nEnd");
  });
  ArduinoOTA.onProgress([](unsigned int progress, unsigned int total) {
    SKETCH_DEBUG_PRINTF("Progress: %u%%\r", (progress / (total / 100)));
  });
  ArduinoOTA.onError([](ota_error_t error) {
    SKETCH_DEBUG_PRINTF("Error[%u]: ", error);
    if (error == OTA_AUTH_ERROR){ SKETCH_DEBUG_PRINTLN("Auth Failed");}
    else if (error == OTA_BEGIN_ERROR){ SKETCH_DEBUG_PRINTLN("Begin Failed");}
    else if (error == OTA_CONNECT_ERROR){ SKETCH_DEBUG_PRINTLN("Connect Failed");}
    else if (error == OTA_RECEIVE_ERROR){ SKETCH_DEBUG_PRINTLN("Receive Failed");}
    else if (error == OTA_END_ERROR){ SKETCH_DEBUG_PRINTLN("End Failed");}
  });
  ArduinoOTA.begin();
  SKETCH_DEBUG_PRINTLN("Ready");
  SKETCH_DEBUG_PRINT("IP address: ");
  SKETCH_DEBUG_PRINTLN(WiFi.localIP());
  SKETCH_DEBUG_PRINT("Free Space: ");
  SKETCH_DEBUG_PRINTLN(ESP.getFreeSketchSpace());
}

void setup() {
  pinMode(3, OUTPUT);

  char *confSsid;
  char *confPassword;
  char *confHost;
  char *mqttServer;
  char *mqttUser;
  char *mqttPasswd;
  int mqttPort;

  delay(1000);
  SKETCH_DEBUG_INIT(115200);
  SKETCH_DEBUG_PRINTLN();

  // Get GPIO 3 Status
  Serial.swap(); //Switch Serial on GPIO 13 & 15
  pinMode(3, INPUT_PULLUP);
  int txStatus = digitalRead(3);
#ifndef CONFIG_ENABLE_EXTRA_GPIO
  Serial.swap(); // Switch back on GPIO 1 & 3
#endif

  EEPROM.begin(CONFIG_EEPROM_SIZE);
  EepromReadConfig(mode, &confSsid, &confPassword, &confHost, &mqttServer, &mqttUser, &mqttPasswd, mqttPort);

  hostName = confHost;
  if (mode == BOOTMODE_NORMAL || mode == BOOTMODE_OTA) {
    SKETCH_DEBUG_PRINTLN("Configuration Found !:");
    SKETCH_DEBUG_PRINTLN(mode);
    SKETCH_DEBUG_PRINTLN(confSsid);
    SKETCH_DEBUG_PRINTLN(confPassword);
    SKETCH_DEBUG_PRINTLN(confHost);
    SKETCH_DEBUG_PRINTLN(mqttServer);
    SKETCH_DEBUG_PRINTLN(mqttUser);
    SKETCH_DEBUG_PRINTLN(mqttPasswd);
    SKETCH_DEBUG_PRINTLN(mqttPort);
    SKETCH_DEBUG_PRINTLN();
  } else {
    SKETCH_DEBUG_PRINTLN("No configuration saved");
  }

  SKETCH_DEBUG_PRINT("Force Setup Mode ? :");
  SKETCH_DEBUG_PRINT(txStatus ? "No" : "Yes");
  SKETCH_DEBUG_PRINTLN();

  WifiSetup(mode, txStatus == 0, confSsid, confPassword, confHost);
  MqttSetup(mqttServer, mqttUser, mqttPasswd, mqttPort, confHost);

  if (mode == BOOTMODE_OTA) {
    OTASetup();
  } else {
    if (BMP180Setup(CONFIG_BMP180_SDA, CONFIG_BMP180_SCL))
      SKETCH_DEBUG_PRINTLN("BMP180 init success");
    WebSetupServer(mode);
  }
}

uint nbCycle = 0;
void loop() {
  if (mode == BOOTMODE_OTA) {
    ArduinoOTA.handle();
  } else {
    server.handleClient();
    MqttCheckSubscription();
    delay(CONFIG_WEB_DELAY_MS);

    nbCycle++;
    if (nbCycle > CONFIG_SAMPLING_PERIODE_MS / CONFIG_WEB_DELAY_MS) {
      if (BMP180IsConnected() && BMP180GetTempAndPressure(temp, pressure) == 0) {
        SKETCH_DEBUG_PRINT("Current T°C ");
        SKETCH_DEBUG_PRINT(temp);
        SKETCH_DEBUG_PRINT( " Pressure mB ");
        SKETCH_DEBUG_PRINTLN(pressure);
        MqttPublish(temp, pressure);
      } else {
        SKETCH_DEBUG_PRINTLN("Cannot get T°C");
      }
      nbCycle = 0;

    }
  }
}