/*
I was having issues printing doubles, so i used serial.println
given more time i would use the method in the api 
*/
#include "api.h"
#include <stdio.h>

uint16_t timer = 0; //variable to track how long the ignition switch has been on for, assumption is that everyloop iteration is 1 second
double threshold = 180; //threshold temp for turning on the oven
double no_data = 999; //hardcoded variable for when the temperture reading can't be used

void setup() {
  Serial.begin(115200);
  setup_api();

//mock unit tests
//I don't know how to actually implement these with out doing some more research
//but theses are two example of cases to be tested and values to test them

//unit test for door sensor voltage inbetween 5V and ground
/* 
sensor_voltage = 2000;
reference_voltage = 5000;
door_voltage = 2500;
*/

//unit test for dividing by zero when calcuating temp
/*
uint16_t sensor_voltage = 2000;
uint16_t reference_voltage = 0;
uint16_t door_voltage = 0;
*/

  Serial.println("Elf oven 2000 starting up.");
  serial_printf("Days without fire incident: %i\n", 0);
}


void loop() {
  //read the various sensor voltages
  uint16_t sensor_voltage = read_voltage(TEMPERATURE_SENSOR);
  uint16_t reference_voltage = read_voltage(TEMPERATURE_SENSOR_REFERENCE);
  uint16_t door_voltage = read_voltage(DOOR_SENSOR);
  Serial.println("sensor_voltage " + String(sensor_voltage));
  Serial.println("reference_voltage " + String(reference_voltage));
  Serial.println("door_voltage " + String(door_voltage));

  
  //linearly scale the refernce voltage so that the possible values for the reference voltages is 4v to 6V
  //this was done to make the pot easier to operate was as ass the fact that the requirmentes state the normal 
  //opertaing voltage is 4.5V - 5.5V
  //TODO: migrate this to the api and make read_voltage return this scaled value 
  double reference = 4000 + (double)read_voltage(TEMPERATURE_SENSOR_REFERENCE) * (2/5);

  //open door or no reference voltage
  //therefore oven is shut off, igntion timer is reset
  if(door_voltage > 0 || reference ==0)
  {
    set_output(GAS_VALVE, 0);
    set_output(IGNITER, 0);
    timer = 0;
  }

  //door sensor indicates closed door  
  //therefore oven operates normally
  else 
  {
    double temp = calculate_temperature();
    Serial.println("temp: " + String(temp));
    
    //oven off: temperature is above the threshold or unreliable temperature data 
    if(temp > threshold || temp == no_data)
    {
      set_output(GAS_VALVE, 0);
      set_output(IGNITER, 0);
      timer = 0;
    }
    //oven on: temperature below threshold
    else 
    {
      //ignition has been on for less than 5 seconds
      //therefore ignition and gas remain on, add second to timer
      if(timer < 5)
      {
        set_output(GAS_VALVE, 1);
        set_output(IGNITER, 1);
        timer = timer + 1;
      }
      
      //ignition has been on for 5 seconds
      //therefore ignition shut off, gas remain on, timer value remains for next loop iteration
      else
      {
        set_output(GAS_VALVE, 1);
        set_output(IGNITER, 0);
      }
    }
  }
  


  delay(1000);
}