/*
  ESP8266 Server program to read Luminox O2 sensor.

  By: Paul O'Neill

  (C) Copyright 2017 by Paul X. O'Neill, All rights reserved.
  This work may be reproduced, modified, distributed, performed, and
  displayed for any purpose, but must acknowledge the author.
  Copyright is retained and must be preserved. The work is
  provided as is; no warranty is provided, and users accept all
  liability.

  Receives from software serial port, sends to hardware serial port.
   RX is digital pin 10 (connect to TX of level shifter: pin B1)
   TX is digital pin 11 (connect to RX of level shifter: pin B2)
  The code was written for hello-nodeMCU and Arduino IDE ver. 1.6.1.

  Adapted from an example program called WiFiWebClient
  included in the Arduino IDE written by dlf (Metodo2 srl)
  and modified by Tom Igoe.

*/


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

const char* ssid = "wf-b";
const char* password = "2627f68597";

String form = "<form action='led'><input type='radio' name='state' value='0' checked>On<input type='radio' name='state' value='1'>Off<input type='submit' value='Submit'></form>";

String imagepage = "<img src='/led.png'>";

// This is a png file (led.png)
const char image[] = {
  0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a, 0x00, 0x00, 0x00, 0x0d, 0x49, 0x48, 0x44, 0x52,
  0x00, 0x00, 0x00, 0x10, 0x00, 0x00, 0x00, 0x10, 0x08, 0x02, 0x00, 0x00, 0x00, 0x90, 0x91, 0x68,
  0x36, 0x00, 0x00, 0x00, 0x01, 0x73, 0x52, 0x47, 0x42, 0x00, 0xae, 0xce, 0x1c, 0xe9, 0x00, 0x00,
  0x00, 0x04, 0x67, 0x41, 0x4d, 0x41, 0x00, 0x00, 0xb1, 0x8f, 0x0b, 0xfc, 0x61, 0x05, 0x00, 0x00,
  0x00, 0x20, 0x63, 0x48, 0x52, 0x4d, 0x00, 0x00, 0x7a, 0x26, 0x00, 0x00, 0x80, 0x84, 0x00, 0x00,
  0xfa, 0x00, 0x00, 0x00, 0x80, 0xe8, 0x00, 0x00, 0x75, 0x30, 0x00, 0x00, 0xea, 0x60, 0x00, 0x00,
  0x3a, 0x98, 0x00, 0x00, 0x17, 0x70, 0x9c, 0xba, 0x51, 0x3c, 0x00, 0x00, 0x00, 0x18, 0x74, 0x45,
  0x58, 0x74, 0x53, 0x6f, 0x66, 0x74, 0x77, 0x61, 0x72, 0x65, 0x00, 0x50, 0x61, 0x69, 0x6e, 0x74,
  0x2e, 0x4e, 0x45, 0x54, 0x20, 0x76, 0x33, 0x2e, 0x33, 0x36, 0xa9, 0xe7, 0xe2, 0x25, 0x00, 0x00,
  0x00, 0x57, 0x49, 0x44, 0x41, 0x54, 0x38, 0x4f, 0x95, 0x52, 0x5b, 0x0a, 0x00, 0x30, 0x08, 0x6a,
  0xf7, 0x3f, 0xf4, 0x1e, 0x14, 0x4d, 0x6a, 0x30, 0x8d, 0x7d, 0x0d, 0x45, 0x2d, 0x87, 0xd9, 0x34,
  0x71, 0x36, 0x41, 0x7a, 0x81, 0x76, 0x95, 0xc2, 0xec, 0x3f, 0xc7, 0x8e, 0x83, 0x72, 0x90, 0x43,
  0x11, 0x10, 0xc4, 0x12, 0x50, 0xb6, 0xc7, 0xab, 0x96, 0xd0, 0xdb, 0x5b, 0x41, 0x5c, 0x6a, 0x0b,
  0xfd, 0x57, 0x28, 0x5b, 0xc2, 0xfd, 0xb2, 0xa1, 0x33, 0x28, 0x45, 0xd0, 0xee, 0x20, 0x5c, 0x9a,
  0xaf, 0x93, 0xd6, 0xbc, 0xdb, 0x25, 0x56, 0x61, 0x01, 0x17, 0x12, 0xae, 0x53, 0x3e, 0x66, 0x32,
  0xba, 0x00, 0x00, 0x00, 0x00, 0x49, 0x45, 0x4e, 0x44, 0xae, 0x42, 0x60, 0x82
};

// HTTP server will listen at port 80
ESP8266WebServer server(80);

const int solenoid = 16;  //ESP-12 pin1, D0, GPIO 16
const int led = 4;        //ESP-12 pin3, D2, GPIO 4

void handle_adc() {
  float val = analogRead(0);
  server.send(200, "text/plain", String(val));
}

void handle_led() {
  // get the value of request argument "state" and convert it to an int
  int state = server.arg("state").toInt();

  digitalWrite(led, state);
  digitalWrite(solenoid, state);
  server.send(200, "text/plain", String("LED is now ") + ((state) ? "off" : "on"));
}

void handle_image() {
  server.send(200, "image/png", "");
  WiFiClient client = server.client();
  client.write(image, sizeof(image));
}

void handle_webpage_with_image() {
  server.send(200, "text/html", imagepage);
}

void setup(void) {
  Serial.begin(9600);
  Serial.println("");
  pinMode(led, OUTPUT);
  pinMode(solenoid, OUTPUT);

  // Connect to WiFi network
  WiFi.begin(ssid, password);

  // Wait for connection
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print("-SOLENOID TEST-");
    digitalWrite(solenoid, HIGH);   // turn the SOLENOID on (HIGH is the voltage level)
    delay(1000);                       // wait for a second
    digitalWrite(solenoid, LOW);    // turn the SOLENOID off by making the voltage LOW
    delay(1000);                       // wait for a second
    digitalWrite(solenoid, HIGH);   // turn the SOLENOID on (HIGH is the voltage level)
    delay(1000);                       // wait for a second
    digitalWrite(solenoid, LOW);    // turn the SOLENOID off by making the voltage LOW
    delay(1000);                       // wait for a second
    digitalWrite(solenoid, HIGH);   // turn the SOLENOID on (HIGH is the voltage level)
    delay(1000);                       // wait for a second
    digitalWrite(solenoid, LOW);    // turn the SOLENOID off by making the voltage LOW
    delay(1000);                       // wait for a second
  }
  Serial.println("");
  Serial.print("Connected to ");
  Serial.println(ssid);
  Serial.print("IP address: ");
  Serial.println(WiFi.localIP());

  // Set up the endpoints for HTTP server
  //
  // Endpoints can be written as inline functions:
  server.on("/", []() {
    server.send(200, "text/html", form);
  });

  // And as regular external functions:
  server.on("/adc", handle_adc);
  server.on("/led", handle_led);
  server.on("/led.png", handle_image);
  server.on("/showled", handle_webpage_with_image);

  // Start the server
  server.begin();
  Serial.println("HTTP server started");
}

void loop(void) {
  // check for incomming client connections frequently in the main loop:
  server.handleClient();
}