#include <ESP8266WiFi.h>
#include <WiFiClient.h>
#include <ESP8266WebServer.h>
#include <ESP8266mDNS.h>
#include <WiFiManager.h> 
#include <FastLED.h>

// LED count and control pin
#define NUM_LEDS 8
#define DATA_PIN D3

// LED array
CRGB leds[NUM_LEDS];

// Web server
ESP8266WebServer server(80);



void setup() {

  // Initialize onboard LED
  pinMode(LED_BUILTIN, OUTPUT);

  // Initialize Wifi, start AP if no saved Wifi in range
  WiFiManager wifiManager;
  wifiManager.autoConnect("WEMOS D1 mini pro");

  // Initialize LEDs
  FastLED.addLeds<WS2812B, DATA_PIN, RGB>(leds, NUM_LEDS);

  // Define web server Handlers
  server.on("/", handleRoot);
  server.onNotFound(handleNotFound);

  // Start webserver
  server.begin();


}

void loop() {
  server.handleClient();
}

void handleRoot() {
  server.send(200, "text/plain", "hello from esp8266!");
}

void handleNotFound() {
  server.send(404, "text/plain", "404 File Not Found");
  blinkLEDs();
}

void blinkLEDs(){
  digitalWrite(LED_BUILTIN, LOW);
  for(int i=0;i<8;i++){
    leds[i] = CRGB::Red;
    FastLED.show();
    delay(20);
  }
  delay(500);
  for(int i=0;i<8;i++){
    leds[i] = CRGB::Black;
    FastLED.show();
    delay(20);
  }
  digitalWrite(LED_BUILTIN, HIGH);
}