#include <ESP8266WiFi.h>
#include <WiFiClient.h> 
#include <ESP8266WebServer.h>
#include <string>
#define D0 2

ESP8266WebServer server(80);
char *APssid = "HomeDynamic";
char *APpw = "homedynamic";
//Global variables for mode
int CurrentMode = 0; //0 = softAP, 1 = STA 
String CurrentStatus = "ON";
String deviceUuid = "3e763aed-be40-4c38-bdda-4d1324d93f06";
String identifier = "relay.std.hd.com.imuslab";

void setup() {
Serial.begin(9600);
delay(1000);
WiFi.hostname("IMUS Relay Module");
boolean result = WiFi.softAP(APssid, APpw);
if(result == true){
Serial.println("Soft AP Starting Ready");
}else{
Serial.println("Soft AP Starting Failed!");
}

//Declare System Function for NodeMCU
server.on("/", showForm);
server.on("/submitForm", submitForm);
server.on("/uuid", uuid);
server.on("/info", info);
server.on("/on", ON);
server.on("/off", OFF);
server.on("/status", Status);

//Declare Output Pins
pinMode(D0, OUTPUT);

//Start Server
server.begin();
Serial.println("Home Dynamic controller started at:");
Serial.println(WiFi.softAPIP());
}

void showForm(){
  int size=1000;
  char temp[size];
  snprintf( temp, size, "<form action='/submitForm' method='GET'> Your Wifi name:<br> <input type='text' name='ssid'><br>Your Wifi password:<br> <input type='text' name='wifipw'><br><br><input type='submit' value='Enter'></form>");
  server.send(200, "text/html", temp);
}

void submitForm(){
  WiFiClient client;

  // ssid and pw from user form GET
  String ssidStr = server.arg("ssid");
  String pwStr = server.arg("wifipw");
  Serial.println(ssidStr);
  Serial.println(pwStr);
  // use the ssid and pw to connect
  int sl1 = ssidStr.length() + 2;
  int sl2 = pwStr.length() + 2;
  char ssidbuf[sl1];
  char pwbuf[sl2];
  char temp[50];
  snprintf( temp, 50, "Please wait while processing...");
  ssidStr.toCharArray(ssidbuf,sl1);
  pwStr.toCharArray(pwbuf,sl2);
  WiFi.begin(ssidbuf, pwbuf);
  WiFi.mode(WIFI_STA);
  Serial.println("Home Dynamic controller connected to user WIFI at: ");
  Serial.println(WiFi.localIP());
  client.print("Connected");
  CurrentMode = 1;
}


void info(){
  int size=1000;
  char temp[size];
  snprintf( temp, size, ("Standard Relay Module_" + identifier).c_str ());
  server.send(200, "text/html", temp);
}

void uuid(){
  int size=100;
  char temp[size];
  snprintf( temp, size, deviceUuid.c_str ());
  server.send(200, "text/html", temp);
}

void ON(){
  digitalWrite(D0,LOW);
  Serial.println("Turned ON");
  CurrentStatus = "ON";
  sendDone();
}

void OFF(){
  digitalWrite(D0,HIGH);
  Serial.println("Turned OFF");
  CurrentStatus = "OFF";
  sendDone();
}

void Status(){
  int size=1000;
  char temp[size];
  snprintf( temp, size, "");
  server.send(200, "text/html", CurrentStatus);
}

void sendDone(){
  int size=100;
  char temp[size];
  snprintf( temp, size, "DONE");
  server.send(200, "text/html", temp);
}

void loop() {
  if (CurrentMode == 0){
    Serial.printf("client count = %d\n", WiFi.softAPgetStationNum());
    delay(300);
  }
server.handleClient();


}