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

#pragma once

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

class ForecastDisplay: public Observer, public DisplayElement
{
private:
    float currentPressure;
    float lastPressure;
    WeatherData &weatherData;
public:
    ForecastDisplay(WeatherData &weatherData) :
        currentPressure(29.92), lastPressure(0.0), weatherData(weatherData)
    {
        weatherData.registerObserver(*this);
    }

    void update(float temperature, float humidity, float pressure) override
    {
        this->lastPressure = this->currentPressure;
        this->currentPressure = pressure;

        display();
    }

    void display() const override
    {
        std::cout << "Forecast: ";
        if (currentPressure > lastPressure) {
            std::cout << "Improving weather on the way!";
        } else if (currentPressure == lastPressure) {
            std::cout << "More of the same";
        } else if (currentPressure < lastPressure) {
            std::cout << "Watch out for cooler, rainy weather";
        }
        std::cout << std::endl;
    }
};