#include <ESP8266WiFi.h>
#include <WiFiClient.h> 
#include <ESP8266WebServer.h>
#include <string>

ESP8266WebServer server(80);
const char *APssid = "Home_Dynamic";
const char *APpw = "homedynamic";

void setup() {
Serial.begin(9600);
delay(1000);
WiFi.hostname("Home_Dynamic");
WiFi.softAP(APssid, APpw);
server.on("/", showForm);
server.on("/submitForm", submitForm);
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;
  int size=1000;
  char temp[size];

  // ssid and pw from user form GET
  String ssidStr = server.arg("ssid");
  String pwStr = server.arg("wifipw");

  // SSID: put String into char array, then char pointer point to the char array
  char tempSSIDStr[ssidStr.length()];
  int i;
  for(i=0;i<4;i++){
    tempSSIDStr[i] = ssidStr[i];
  }
  tempSSIDStr[ssidStr.length()] = '\0';
  char *ssid = tempSSIDStr;

  // pw: put String into char array, then char pointer point to the char array
  char tempPWStr[pwStr.length()];
  for(i=0;i<4;i++){
    tempPWStr[i] = pwStr[i];
  }
  tempPWStr[pwStr.length()] = '\0';
  char *pw = tempPWStr;

  // use the ssid and pw to connect
  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, pw);
  Serial.println("Home Dynamic controller connected to user WIFI at: ");
  Serial.println(WiFi.localIP());
  client.print("Connected");
}

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