/*
 * switch.ino
 *
 *  Created on: 2020-05-15
 *      Author: Mixiaoxiao (Wang Bin)
 *
 * HAP section 8.38 Switch
 * An accessory contains a switch.
 *
 * This example shows how to:
 * 1. define a switch accessory and its characteristics (in my_accessory.c).
 * 2. get the switch-event sent from iOS Home APP.
 * 3. report the switch value to HomeKit.
 *
 * You should:
 * 1. read and use the Example01_TemperatureSensor with detailed comments
 *    to know the basic concept and usage of this library before other examples。
 * 2. erase the full flash or call homekit_storage_reset() in setup()
 *    to remove the previous HomeKit pairing storage and
 *    enable the pairing with the new accessory of this new HomeKit example.
 */

#include <Arduino.h>
#include <arduino_homekit_server.h>
#include "wifi_info.h"

#define LOG_D(fmt, ...)   printf_P(PSTR(fmt "\n"), ##__VA_ARGS__);

bool isPCOn;
bool changeExecutedFromHomekit;
const long interval = 20000;
unsigned long previousMillis = 0;

void setup() {

	Serial.begin(115200);
	wifi_connect(); // in wifi_info.h
	//homekit_storage_reset(); // to remove the previous HomeKit pairing storage when you first run this new HomeKit example
	my_homekit_setup();
}

void loop() {

	my_homekit_loop();
  delay(10);

  LOG_D("Loops");

  unsigned long currentMillis = millis();

  //Only continue if we passed the interval
  if (currentMillis - previousMillis < interval) {
    // save the last time you blinked the LED
    return;
  }

  previousMillis = currentMillis;

  syncPCAndHomekitStatus();

}

//==============================
// HomeKit setup and loop
//==============================

// access your HomeKit characteristics defined in my_accessory.c
extern "C" homekit_server_config_t config;
extern "C" homekit_characteristic_t cha_switch_on;

static uint32_t next_heap_millis = 0;

#define GPIO_OUT_SW     14 //D5 - Schaltet Relay
#define GPIO_IN_STATUS  12 //D6 - PC Status mit Pullup
#define DURATION_HOLD_TOGGLE   300
#define DURATION_HOLD_TURN_OFF_HARD   6000
#define RELAY_CLOSED 1
#define RELAY_OPEN (!RELAY_CLOSED)

//Called when the switch value is changed by iOS Home APP
void cha_switch_on_setter(const homekit_value_t value) {

  changeExecutedFromHomekit = true;

  cha_switch_on.value.bool_value = value.bool_value;

  //Read PC Status LED
  syncPCAndHomekitStatus();

}

void pushPowerButton() {
  digitalWrite(GPIO_OUT_SW, RELAY_OPEN);
  delay(DURATION_HOLD_TOGGLE);
  digitalWrite(GPIO_OUT_SW, RELAY_CLOSED);
}

void my_homekit_setup() {

	initRelayPinAsClosed();

	//Add the .setter function to get the switch-event sent from iOS Home APP.
	//The .setter should be added before arduino_homekit_setup.
	//HomeKit sever uses the .setter_ex internally, see homekit_accessories_init function.
	//Maybe this is a legacy design issue in the original esp-homekit library,
	//and I have no reason to modify this "feature".
	cha_switch_on.setter = cha_switch_on_setter;
	arduino_homekit_setup(&config);

	//report the switch value to HomeKit if it is changed (e.g. by a physical button)
	//bool switch_is_on = true/false;
	//cha_switch_on.value.bool_value = switch_is_on;
	//homekit_characteristic_notify(&cha_switch_on, cha_switch_on.value);
}

void my_homekit_loop() {
	arduino_homekit_loop();
	const uint32_t t = millis();
	if (t > next_heap_millis) {
		// show heap info every 5 seconds
		next_heap_millis = t + 5 * 1000;
		LOG_D("Free heap: %d, HomeKit clients: %d",
				ESP.getFreeHeap(), arduino_homekit_connected_clients_count());

	}
}

void updatePCIsOnStatus() {

  isPCOn = false;
  int status = 0;
  status = digitalRead(GPIO_IN_STATUS);

  if (status = 0)
  {
      isPCOn = true;
  }
}

void syncPCAndHomekitStatus() {

  LOG_D("Syncing States");

  updatePCIsOnStatus();

  //Homekit Status
  bool shouldPCBeTurnedOn = cha_switch_on.value.bool_value;

  if (shouldPCBeTurnedOn != isPCOn) {
      //2 Options:
      //Power button was pressed and Homekit status is wrong -> Update HomekitStatus
      if (!changeExecutedFromHomekit) {
          LOG_D("Difference from Power button without scheduled change -> Syncing To Homekit");
          cha_switch_on.value.bool_value = isPCOn;
          homekit_characteristic_notify(&cha_switch_on, cha_switch_on.value);

      } else {
          //Change was executed from Homekit -> Push button!
          LOG_D("Difference from Power button with Sheduled Change -> Push button!");
          changeExecutedFromHomekit = false;
          pushPowerButton();
      }
  }

}

void initRelayPinAsClosed() {
  pinMode(GPIO_OUT_SW, OUTPUT);
  digitalWrite(GPIO_OUT_SW, RELAY_CLOSED);
}