/********************************************************************************
 * The MIT License (MIT)
 *
 * Copyright (c) 2015 Nis Wechselberg
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 ********************************************************************************/

/********************************************************************************
 * ESP8266-RGB-WiFiServer
 * Sets the color of an RGB LED Ribbon through an HTTP Server
 ********************************************************************************/
#include <ESP8266WiFi.h>
#include "ESP8266-RGB-WiFiServer.h"

// Pin configuration
const int redPin = 12;
const int greenPin = 13;
const int bluePin = 14;

// HTTP configuration
const unsigned char port = 80;

// Create an instance of the server
WiFiServer server(port);

void setup() {
  // Initialize Serial connection
  Serial.begin(115200);
  delay(10);

  // Prepare color pins
  pinMode(redPin, OUTPUT);
  pinMode(greenPin, OUTPUT);
  pinMode(bluePin, OUTPUT);
  
  // Connect to WiFi network
  Serial.println();
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);
  
  WiFi.begin(ssid, password);
  
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.println("WiFi connected");
  
  // Start the server
  server.begin();
  Serial.println("Server started");

  // Print the IP address
  Serial.println(WiFi.localIP());
  
  // Test the LED color channels
  setColourRgb(0,0,0);
  delay(500);
  setColourRgb(200,0,0);
  delay(500);
  setColourRgb(0,200,0);
  delay(500);
  setColourRgb(0,0,200);
  delay(500);
  setColourRgb(200,200,200);
  delay(500);
  setColourRgb(0,0,0);
}

void loop() {
  // Check if a client has connected
  WiFiClient client = server.available();
  if (!client) {
    return;
  }
  
  // Wait until the client sends some data
  Serial.println("new client");
  while(!client.available()){
    delay(1);
  }
  
  // Read the first line of the request
  String req = client.readStringUntil('\r');
  Serial.println(req);
  client.flush();
  
  // Match the request
  if (req.indexOf("/gpio/rgb/") != -1) {
    // Request of the form "/gpio/rgb/red/green/blue/"
    // Delimiters for pwm values
    int br, er, eg, eb;
    br = req.indexOf("/gpio/rgb/") + 10;
    er = req.indexOf("/",br+1);
    eg = req.indexOf("/",er+1);
    eb = req.indexOf("/",eg+1);
    // Check if all values were filled in the request
    if (br == -1 || er == -1 || eg == -1 || eb == -1) {
      Serial.println("Invalid request");
      client.stop();
      return;
    }
    // Parse values in request
    int red   = req.substring(br,er).toInt();
    int green = req.substring(er+1,eg).toInt();
    int blue  = req.substring(eg+1,eb).toInt();

    // Sanitize values
    if (red < 0) { red = 0; }
    if (green < 0) { green = 0; }
    if (blue < 0) { blue = 0; }
    if (red > 1023) { red = 1023; }
    if (green > 1023) { green = 1023; }
    if (blue > 1023) { blue = 1023; }

    // Apply colors    
    setColourRgb(red, green, blue);
  } else {
    Serial.println("invalid request");
    client.stop();
    return;
  }

  client.flush();

  // Prepare the response
  String s = "HTTP/1.1 200 OK\r\nContent-Type: text/html\r\n\r\n<!DOCTYPE HTML>\r\n<html>\r\nOK</html>\n";

  // Send the response to the client
  client.print(s);
  delay(1);

  Serial.println("Disconnecting client");
  // The client will actually be disconnected 
  // when the function returns and 'client' object is detroyed
}

/* Helper function to set the colors of the led strip */
void setColourRgb(unsigned int red, unsigned int green, unsigned int blue) {
  analogWrite(redPin, red);
  analogWrite(greenPin, green);
  analogWrite(bluePin, blue);
}