#ifdef ESP32

#include <DNSServer.h>

#include <WebServer.h>

#include <WiFi.h>

#else

#include <DNSServer.h>

#include <ESP8266WebServer.h>

#include <ESP8266WiFi.h>

#endif

#include <WiFiManager.h>

#include <Adafruit_GFX.h>

#include <Max72xxPanel.h>

#include <ESP8266HTTPClient.h>

#include <ArduinoJson.h>

 

int pinCS = D4; // Attach CS to this pin, DIN to MOSI and CLK to SCK (cf http://arduino.cc/en/Reference/SPI )

int numberOfHorizontalDisplays = 4;

int numberOfVerticalDisplays   = 1;

DynamicJsonBuffer jsonBuffer;

 

// LED Matrix Pin -> ESP8266 Pin

// Vcc            -> 3v  (3V on NodeMCU 3V3 on WEMOS)

// Gnd            -> Gnd (G on NodeMCU)

// DIN            -> D7  (Same Pin for WEMOS)

// CS             -> D4  (Same Pin for WEMOS)

// CLK            -> D5  (Same Pin for WEMOS)

 

Max72xxPanel matrix = Max72xxPanel(pinCS, numberOfHorizontalDisplays, numberOfVerticalDisplays);

 

int wait = 100; // In milliseconds

 

int zaehler = -1;

// https://www.finanzen.net/aktien/Tesla-Aktie

char* coins[] = {"share:Tesla-Aktie", "share:BVB-Aktie", "bitcoin", "ethereum", "dash", "pivx", "verge"};

 

String text = "CONNECTING...";

String coin = "";

String coinText = "";

String coinSymbol = "";

 

int arraySize = 0;

int spacer = 1;

int width  = 5 + spacer; // The font width is 5 pixels

 

void setup() {

  Serial.begin(115200);

  WiFi_Setup();

 

  matrix.setIntensity(0); // Use a value between 0 and 15 for brightness

  matrix.setRotation(0, 1);    // The first display is position upside down

  matrix.setRotation(1, 1);    // The first display is position upside down

  matrix.setRotation(2, 1);    // The first display is position upside down

  matrix.setRotation(3, 1);    // The first display is position upside down

}

 

void loop() {

  matrix.fillScreen(LOW);

 

  Serial.println(zaehler);

 

  if (zaehler == -1) {

    display_message(text);

    delay(2000);

    zaehler = 1;

  }

  else if (zaehler == 0) {

    zaehler = 10;

    if (WiFi.status() == WL_CONNECTED) {

      HTTPClient http;

      text = "";

      arraySize = sizeof(coins) / sizeof(char *);

      for (int i = 0; i < arraySize; i++) {

        coin = String(coins[i]);

        coinText = "";

        coinSymbol = "";

        Serial.println(i);

        http.begin("http://coin.blessuren.de/get.php?coin=" + coin);

        int httpCode = http.GET();

        if (httpCode > 0) {

          coinText = http.getString();

          if(coin.indexOf(':') < 0) {

            JsonArray& array = jsonBuffer.parseArray(coinText);

            JsonObject& root = jsonBuffer.parseObject(array.get<String>(0));

            coinText = root["price_usd"].as<String>(); // or price_eur

            coinSymbol = root["symbol"].as<String>();

            coinText = coinSymbol + ":$" + coinText.substring(0, coinText.indexOf('.') + 3); // 4 = 3 digits after . 3 = 2 digits after .

            jsonBuffer.clear();

          }

        }

        else {

          text = "HTTPS Error";

        }

        http.end();

        text = text + ' ' + coinText;

      }

    }

 

 

  }

 

  zaehler--;

  display_message(text);

}

 

void display_message(String message) {

  for ( int i = 0 ; i < width * message.length() + matrix.width() - spacer; i++ ) {

    //matrix.fillScreen(LOW);

    int letter = i / width;

    int x = (matrix.width() - 1) - i % width;

    int y = (matrix.height() - 8) / 2; // center the text vertically

    while ( x + width - spacer >= 0 && letter >= 0 ) {

      if ( letter < message.length() ) {

        matrix.drawChar(x, y, message[letter], HIGH, LOW, 1); // HIGH LOW means foreground ON, background off, reverse to invert the image

      }

      letter--;

      x -= width;

    }

    matrix.write(); // Send bitmap to display

    delay(wait / 2);

  }

}

 

void WiFi_Setup() {

  WiFiManager wifiManager; // Connect to Wi-Fi

  // A new OOB ESP has no Wi-Fi credentials so will connect and not need the next command to be uncommented and compiled in, a used one with incorrect credentials will

  // so restart the ESP and connect your PC to the wireless access point called 'ESP_AP' or whatever you call it below in ""

  // wifiManager.resetSettings(); // Command to be included if needed, then connect to http://192.168.4.1/ and follow instructions to make the WiFi connection

  // Set a timeout until configuration is turned off, useful to retry or go to sleep in n-seconds

  wifiManager.setTimeout(180);

  //fetches ssid and password and tries to connect, if connections succeeds it starts an access point with the name called "ESP8266_AP" and waits in a blocking loop for configuration

  if (!wifiManager.autoConnect("ESP_AP")) {

    Serial.println(F("failed to connect and timeout occurred"));

    delay(6000);

    ESP.restart(); //reset and try again

  }

  // At this stage the WiFi manager will have successfully connected to a network, or if not will try again in 180-seconds

  Serial.println(F("WiFi connected..."));

  //----------------------------------------------------------------------

  Serial.println(F("Use this URL to connect: http://")); Serial.println(WiFi.localIP().toString() + "/"); // Print the IP address

}