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//This example will use a static IP to control the switching of a relay. Over LAN using a web browser. 
//A lot of this code have been resued from the example on the ESP8266 Learning Webpage below. 
//http://www.esp8266learning.com/wemos-webserver-example.php
 
//CODE START 
//1
#include <ESP8266WiFi.h>
 
// Below you will need to use your own WIFI informaiton.
//2
const char* ssid = ""; //WIFI Name, WeMo will only connect to a 2.4GHz network.
const char* password = ""; //WIFI Password
 
//defining the pin and setting up the "server"
//3
int relayPin = D1; // The Shield uses pin 1 for the relay-
int value = LOW;
WiFiServer server(80);
IPAddress ip(192, 168, 1, 5); // where xx is the desired IP Address
IPAddress gateway(192, 168, 1, 1); // set gateway to match your network
IPAddress subnet(255, 255, 255, 0); // set subnet mask to match your network
 
 
// void setup is where we initialize variables, pin modes, start using libraries, etc. 
//The setup function will only run once, after each powerup or reset of the wemos board.
//4
void setup() {
  Serial.begin(115200);
  delay(10);
 
 
  pinMode(relayPin, OUTPUT);
  digitalWrite(relayPin, LOW);
 
  Serial.print(F("Setting static ip to : "));
  Serial.println(ip);
  
  // Connect to WiFi network
  //5
  Serial.println();
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);
  WiFi.config(ip, gateway, subnet); 
  WiFi.begin(ssid, password);
  //Trying to connect it will display dots
  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.print("Use this URL : ");
  Serial.print("http://");
  Serial.print(WiFi.localIP());
  Serial.println("/"); 
}
 
//void loop is where you put all your code. it is a funtion that returns nothing and will 
//repeat over and over again
//6
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 request = client.readStringUntil('\r');
  Serial.println(request);
  client.flush();
 
  //Match the request, checking to see what the currect state is
  value = LOW;
  if (request.indexOf("/relay=ON") != -1) {
    digitalWrite(relayPin, HIGH);
    value = HIGH;
  } 
  if (request.indexOf("/relay=OFF") != -1){
    digitalWrite(relayPin, LOW);
    value = LOW;
  }
  // Return the response, build the html page
  //7
  
  // showButtons();
 
  // client.print("Relay is now: ");
 
  // if(value == HIGH) {
    // client.print("Engaged (ON)");  
  // } else {
    // client.print("Disengaged (OFF)");
  // }
  // client.println("<br><br><br>");
  // client.println("<a href=\"/relay=ON\">Click here to engage (Turn ON) the relay.</a> <br><br><br>");
  // client.println("<a href=\"/relay=OFF\">Click here to disengage (Turn OFF) the relay.</a><br>");
  // client.println("</html>");
  showButtons(client);
  
  delay(1);
  Serial.println("Client disconnected");
  Serial.println("");
 
}//END
 
void showButtons(WiFiClient client) {
  client.println("HTTP/1.1 200 OK");
  client.println("Content-Type: text/html");
  client.println(""); //  do not forget this one
  client.println("<!DOCTYPE HTML>");
  client.println("<html>");
 
  client.print("Relay is now: ");
 
  if(value == HIGH) {
    client.print("Engaged (ON)");  
  } else {
    client.print("Disengaged (OFF)");
  }
 
  client.println("<a href=\"/relay=ON\"><input type=\"button\" value=\"Relay On\" /></a><br><br><a href=\"/relay=OFF\"><input type=\"button\" value=\"Relay Off\" /></a>");
  
}