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#include <Arduino.h>

#include <ESP8266WiFi.h>
#include <ESP8266WiFiMulti.h>

#include <ESP8266HTTPClient.h>

#include <WiFiClient.h>

const char* ssid = "你的wifi名";
const char* password = "你的wifi密码";

bool isSent = false;
bool isFirst = true;
bool isDark = false;

void setup() {

  Serial.begin(19200);
  Serial.setDebugOutput(true);

  Serial.println();
  Serial.println();
  Serial.println();

  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);
}

void loop() {
  // wait for WiFi connection
  if ((WiFi.status() == WL_CONNECTED)) {
    int lightValue = analogRead(0); // 1024 is dark
    if (lightValue > 1000) { // dark mode
      if (isDark) {
        isSent = true;
      } else {
        isSent = false;
      }
      isDark = true;
    } else { // light mode
      isDark = false;
    }
    if (isFirst) { // If is first start
      // do nothing
      isSent = false;
      isFirst = false;
    } 
    if (!isSent) { // is sent value to server
      isSent = true;
      sendToServer();
    }
  }
  delay(1000);
}

void sendToServer() {
  WiFiClient client;

  HTTPClient http;

  Serial.print("[HTTP] begin...\n");
  if (http.begin(client, "这里是你的服务器地址")) {  // HTTP


    Serial.print("[HTTP] GET...\n");
    // start connection and send HTTP header
    int httpCode = http.GET();

    // httpCode will be negative on error
    if (httpCode > 0) {
      // HTTP header has been send and Server response header has been handled
      Serial.print("[HTTP] GET... code: \n");
      
      // file found at server
      if (httpCode == HTTP_CODE_OK || httpCode == HTTP_CODE_MOVED_PERMANENTLY) {
        String payload = http.getString();
        Serial.print(payload);
        Serial.println();
      }
    } else {
      Serial.print("error start");
      Serial.print(http.errorToString(httpCode).c_str());
      Serial.print("error end");
    }

    http.end();
  } else {
    Serial.print("[HTTP} Unable to connect\n");
  }
}