/*
 * HeatIndexDisplay.hpp
 *
 *  Created on: 31 окт. 2021 г.
 *      Author: alexander
 */

#pragma once

#include "Observer.hpp"
#include "DisplayElement.hpp"
#include "WeatherData.hpp"

class HeatIndexDisplay: public Observer, public DisplayElement
{
private:
    float heatIndex;
    WeatherData &weatherData;

    float computeHeatIndex(float t, float rh)
    {
        float index = (float) ((16.923 + (0.185212 * t) + (5.37941 * rh) - (0.100254 * t * rh) + (0.00941695 * (t * t)) + (0.00728898 * (rh * rh))
                + (0.000345372 * (t * t * rh)) - (0.000814971 * (t * rh * rh)) + (0.0000102102 * (t * t * rh * rh)) - (0.000038646 * (t * t * t))
                + (0.0000291583 * (rh * rh * rh)) + (0.00000142721 * (t * t * t * rh)) + (0.000000197483 * (t * rh * rh * rh))
                - (0.0000000218429 * (t * t * t * rh * rh)) + 0.000000000843296 * (t * t * rh * rh * rh))
                - (0.0000000000481975 * (t * t * t * rh * rh * rh)));
        return index;
    }
public:
    HeatIndexDisplay(WeatherData &weatherData) : heatIndex(0.0), weatherData(weatherData)
    {
        weatherData.registerObserver(*this);
    }

    void update(float temperature, float humidity, float pressure) override
    {
        heatIndex = computeHeatIndex(temperature, humidity);

        display();
    }

    void display() const override
    {
        std::cout << "Heat index is " << heatIndex << std::endl;
    }
};