#include <ESP8266WiFi.h>          /* Basic ESP WiFi support */
#include <DNSServer.h>            /* Needed by other libraries */
#include <ESP8266WebServer.h>     /* WebServer for config and RET api */
#include <ArduinoJson.h>          /* JSON handling for REST api */
#include <WiFiManager.h>          /* Runtime WiFi Configuration */
#include <Adafruit_NeoPixel.h>    /* Comfortable control for WS2812 */

// Pin the LED strip is connected to
#define LED_PIN D4                /* D4 is not the same as just 4 */

// Number of LEDs in the strip
#define LED_COUNT 150

// Allocate a runtime object for the LED strip
Adafruit_NeoPixel strip(LED_COUNT, LED_PIN, NEO_GRB + NEO_KHZ800);

// Port for the REST api to control the LEDs
#define HTTP_REST_PORT 80
// Webserver handling the REST api
ESP8266WebServer http_rest_server(HTTP_REST_PORT);


void get_leds() {
    StaticJsonDocument<200> jsonDocument;
    JsonObject jsonObj = jsonDocument.as<JsonObject>();
    char JSONmessageBuffer[200];

//    if (led_resource.id == 0)
//        http_rest_server.send(204);
//    else {
        jsonObj["id"] = 1;
//       jsonObj["gpio"] = led_resource.gpio;
//        jsonObj["status"] = led_resource.status;
        serializeJsonPretty(jsonDocument, JSONmessageBuffer);
        //jsonObj.prettyPrintTo(JSONmessageBuffer, sizeof(JSONmessageBuffer));
        http_rest_server.send(200, "application/json", JSONmessageBuffer);
//    }
}


void config_rest_server_routing() {
    http_rest_server.on("/", HTTP_GET, []() {
        http_rest_server.send(200, "text/html",
            "Welcome to the ESP8266 REST Web Server");
    });
    http_rest_server.on("/leds", HTTP_GET, get_leds);
    //http_rest_server.on("/leds", HTTP_POST, post_put_leds);
    //http_rest_server.on("/leds", HTTP_PUT, post_put_leds);
}


void setup() {
  // Enable serial port for debugging
  Serial.begin(115200);
  Serial.println("Booting ...");

  // Initialize the LED strip as soon as possible
  Serial.print("Initializing NeoPixel strip ... ");
  strip.begin();           /* Initialize NeoPixel strip object */
  strip.show();            /* Turn off all pixels asap */
  /* Set brightness to something manageable, 
   * to reduce current draw and don't burn 
   * the eyes of bystanders */ 
  strip.setBrightness(30);
  Serial.println("done");

  // Take care of the WiFi connection
  // Local intialization of the manager, not needed at runtime anymore
  Serial.println("Initializing WiFiManager");
  WiFiManager wifiManager;
  //reset saved settings
  //wifiManager.resetSettings();

  // Try to connect with existing credentials
  // If that doesn't work fall back to config mode
  // If nothing is configured until the timeout, fall back to AP mode
  wifiManager.autoConnect();
    
  //if you get here you have connected to the WiFi
  Serial.println("WiFi connected");

  Serial.print("Starting WebServer for REST api ... ");
  config_rest_server_routing();
  http_rest_server.begin();
  Serial.println("done");
}

void loop() {

   http_rest_server.handleClient();

  // Fill along the length of the strip in various colors...
  Serial.println("Red ColorWipe");
  colorWipe(strip.Color(255,   0,   0), 50); // Red

  http_rest_server.handleClient();

  Serial.println("Green ColorWipe");
  colorWipe(strip.Color(  0, 255,   0), 50); // Green

  http_rest_server.handleClient();
  
  Serial.println("Blue ColorWipe");
  colorWipe(strip.Color(  0,   0, 255), 50); // Blue

  // Do a theater marquee effect in various colors...

  http_rest_server.handleClient();
  
  Serial.println("White TheaterChase");
  theaterChase(strip.Color(127, 127, 127), 50); // White, half brightness

  http_rest_server.handleClient();
  
  Serial.println("Red TheaterChase");
  theaterChase(strip.Color(127,   0,   0), 50); // Red, half brightness

  http_rest_server.handleClient();
  
  Serial.println("Blue TheaterChase");
  theaterChase(strip.Color(  0,   0, 127), 50); // Blue, half brightness


  http_rest_server.handleClient();
  
  Serial.println("Rainbow");
  rainbow(10);             // Flowing rainbow cycle along the whole strip

  http_rest_server.handleClient();
  
  Serial.println("Rainbow Chase");
  theaterChaseRainbow(50); // Rainbow-enhanced theaterChase variant
}


// Some functions of our own for creating animated effects -----------------

// Fill strip pixels one after another with a color. Strip is NOT cleared
// first; anything there will be covered pixel by pixel. Pass in color
// (as a single 'packed' 32-bit value, which you can get by calling
// strip.Color(red, green, blue) as shown in the loop() function above),
// and a delay time (in milliseconds) between pixels.
void colorWipe(uint32_t color, int wait) {
  for(int i=0; i<strip.numPixels(); i++) { // For each pixel in strip...
    strip.setPixelColor(i, color);         //  Set pixel's color (in RAM)
    strip.show();                          //  Update strip to match
    delay(wait);                           //  Pause for a moment
  }
}

// Theater-marquee-style chasing lights. Pass in a color (32-bit value,
// a la strip.Color(r,g,b) as mentioned above), and a delay time (in ms)
// between frames.
void theaterChase(uint32_t color, int wait) {
  for(int a=0; a<10; a++) {  // Repeat 10 times...
    for(int b=0; b<3; b++) { //  'b' counts from 0 to 2...
      strip.clear();         //   Set all pixels in RAM to 0 (off)
      // 'c' counts up from 'b' to end of strip in steps of 3...
      for(int c=b; c<strip.numPixels(); c += 3) {
        strip.setPixelColor(c, color); // Set pixel 'c' to value 'color'
      }
      strip.show(); // Update strip with new contents
      delay(wait);  // Pause for a moment
    }
  }
}

// Rainbow cycle along whole strip. Pass delay time (in ms) between frames.
void rainbow(int wait) {
  // Hue of first pixel runs 5 complete loops through the color wheel.
  // Color wheel has a range of 65536 but it's OK if we roll over, so
  // just count from 0 to 5*65536. Adding 256 to firstPixelHue each time
  // means we'll make 5*65536/256 = 1280 passes through this outer loop:
  for(long firstPixelHue = 0; firstPixelHue < 5*65536; firstPixelHue += 256) {
    for(int i=0; i<strip.numPixels(); i++) { // For each pixel in strip...
      // Offset pixel hue by an amount to make one full revolution of the
      // color wheel (range of 65536) along the length of the strip
      // (strip.numPixels() steps):
      int pixelHue = firstPixelHue + (i * 65536L / strip.numPixels());
      // strip.ColorHSV() can take 1 or 3 arguments: a hue (0 to 65535) or
      // optionally add saturation and value (brightness) (each 0 to 255).
      // Here we're using just the single-argument hue variant. The result
      // is passed through strip.gamma32() to provide 'truer' colors
      // before assigning to each pixel:
      strip.setPixelColor(i, strip.gamma32(strip.ColorHSV(pixelHue)));
    }
    strip.show(); // Update strip with new contents
    delay(wait);  // Pause for a moment
  }
}

// Rainbow-enhanced theater marquee. Pass delay time (in ms) between frames.
void theaterChaseRainbow(int wait) {
  int firstPixelHue = 0;     // First pixel starts at red (hue 0)
  for(int a=0; a<30; a++) {  // Repeat 30 times...
    for(int b=0; b<3; b++) { //  'b' counts from 0 to 2...
      strip.clear();         //   Set all pixels in RAM to 0 (off)
      // 'c' counts up from 'b' to end of strip in increments of 3...
      for(int c=b; c<strip.numPixels(); c += 3) {
        // hue of pixel 'c' is offset by an amount to make one full
        // revolution of the color wheel (range 65536) along the length
        // of the strip (strip.numPixels() steps):
        int      hue   = firstPixelHue + c * 65536L / strip.numPixels();
        uint32_t color = strip.gamma32(strip.ColorHSV(hue)); // hue -> RGB
        strip.setPixelColor(c, color); // Set pixel 'c' to value 'color'
      }
      strip.show();                // Update strip with new contents
      delay(wait);                 // Pause for a moment
      firstPixelHue += 65536 / 90; // One cycle of color wheel over 90 frames
    }
  }
}