#include <WiFiClientSecure.h>

#include <ESP8266WiFi.h>
#include <PubSubClient.h>

#include "mqtt_crt.h"
#include "mqtt_key.h"

#include "time.h"

const char* ssid = "x";
const char* password = "x";
const char* mqtt_server = "192.168.254.8";
const char* my_name = "esp-ctrl-5ccf7f0167f0";

const uint8_t IP[4] = {192, 168, 254, 15};
const uint8_t GATEWAY[4] = {192, 168, 254, 1};
const uint8_t SUBNET[4] = {255, 255, 255, 0};
const uint8_t DNS[4] = {8, 8, 8, 8};

int timezone = 0;
int dst = 0;

WiFiClientSecure espClient;
PubSubClient client(espClient);
long lastMsg = 0;
char msg[50];
int value = 0;

void callback(char* topic, byte* payload, unsigned int length);

void setup() {
  Serial.begin(115200);
  Serial.setDebugOutput(true);

  WiFi.mode(WIFI_STA);

  WiFi.hostname(my_name);
  WiFi.config(IP, GATEWAY, SUBNET, DNS);
  WiFi.begin(ssid, password);

  Serial.println("\nConnecting to WiFi");
  while (WiFi.status() != WL_CONNECTED) {
    Serial.print(".");
    delay(1000);
  }

  configTime(timezone, dst, "pool.ntp.org", "time.nist.gov");
  Serial.println("\nWaiting for time");
  while (!time(nullptr)) {
    Serial.print(".");
    delay(100);
  }
  Serial.println("");


  espClient.setCertificate(esp_crt, esp_crt_len);
  espClient.setPrivateKey(esp_key, esp_key_len);

  client.setServer(mqtt_server, 1883);
  client.setCallback(callback);
}

void callback(char* topic, byte* payload, unsigned int length) {
  Serial.print("Message arrived [");
  Serial.print(topic);
  Serial.print("] ");
  for (int i = 0; i < length; i++) {
    Serial.print((char)payload[i]);
  }
  Serial.println();

  // Switch on the LED if an 1 was received as first character
  if ((char)payload[0] == '1') {
    digitalWrite(BUILTIN_LED, LOW);   // Turn the LED on (Note that LOW is the voltage level
    // but actually the LED is on; this is because
    // it is acive low on the ESP-01)
  } else {
    digitalWrite(BUILTIN_LED, HIGH);  // Turn the LED off by making the voltage HIGH
  }

}

void reconnect() {
  // Loop until we're reconnected
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    // Attempt to connect
    if (client.connect("ESP8266Client")) {
      Serial.println("connected");
      // Once connected, publish an announcement...
      client.publish("outTopic", "hello world");
      // ... and resubscribe
      client.subscribe("inTopic");
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      // Wait 5 seconds before retrying
      delay(5000);
    }
  }
}

void loop() {
  time_t n = time(nullptr);
  Serial.println(ctime(&n));
  delay(1000);

  if (!client.connected()) {
    reconnect();
  }
  client.loop();

  long now = millis();
  if (now - lastMsg > 2000) {
    lastMsg = now;
    ++value;
    snprintf (msg, 75, "hello world #%ld", value);
    Serial.print("Publish message: ");
    Serial.println(msg);
    client.publish("outTopic", msg);
  }
}