// PressureMonitor: evaluates vessel pressure against safe operating limits.

#pragma once

#include <cstdint>

// Safe operating limits in kPa.

static constexpr float kMaxPressure = 200.0f; // upper safe limit

static constexpr float kMinPressure =  50.0f; // lower operating limit

// Calibrated pressure reading with a monotonic sample counter.

struct PressureReading {

  float    valuekPa; // calibrated pressure in kPa

  uint32_t sampleId; // monotonically increasing sample identifier

};

// Monitors vessel pressure and drives the alarm relay.

class PressureMonitor {

public:

  // Parameters:

  //   calibrationFactor - volts-to-kPa scaling factor for this sensor model

  // Returns: new PressureMonitor ready to evaluate pressure readings

  explicit PressureMonitor(float calibrationFactor);

  // Parameters:

  //   pressure - calibrated pressure reading in kPa

  // Returns: true if pressure is outside the safe operating range, false otherwise.

  //   An alarm fires when pressure is above kMaxPressure OR below kMinPressure.

  bool shouldAlarm(float pressure) const;

  // Parameters:

  //   rawVoltage - uncalibrated voltage output from the sensor ADC

  // Returns: calibrated PressureReading with an incremented sampleId

  PressureReading normalize(float rawVoltage) const;

private:

  float            calibrationFactor_; // volts-to-kPa scaling factor

  mutable uint32_t sampleId_ = 0;      // incremented on every normalize() call

};