#pragma once

#include <QObject>
#include <QVector>
#include <QString>

/*
 UtciCalculator
 - lit un fichier de coefficients (format ESM_3/tab-delimited)
 - calcule UTCI via l'approximation polynomiale : UTCI = Ta + Offset(Ta, va, tm, pa)
   where tm = Tr - Ta and pa is water vapour pressure in kPa.
 - fournit une fonction utilitaire pour calculer pa depuis Ta et relative humidity (Magnus-Tetens).
*/

class UtciCalculator : public QObject
{
    Q_OBJECT
public:
    explicit UtciCalculator(QObject *parent = nullptr);

    // Load coefficients from a file (ESM_3 table or exported txt)
    // Return true on success.
    //bool loadCoefficientsFromFile(const QString &path);

    // Calculate UTCI.
    // Ta: air temperature (°C)
    // va: wind speed at 10 m (m/s)
    // Tr: mean radiant temperature (°C)
    // rh: relative humidity in % (0..100). If rh < 0, supply pa directly (next param) and set pa_provided=true.
    // pa_kpa: vapour pressure in kPa (used if pa_provided==true)
    double computeUTCI(double Ta, double va, double Tr, double rh) const;

    // Utility: compute water vapour pressure (kPa) from Ta and relative humidity (Magnus formula)
    // Ta in °C, rh in %
    static double vapourPressureFromRH(double Ta, double rh_percent);

private:
    // coefficients in the same order as the ESM_3 polynomial table terms.
    QVector<double> m_coeffs;

    // Evaluate the polynomial offset = f(Ta, va, tm, pa)
    double evalOffset(double Ta, double va, double tm, double pa) const;
    void initCoefficients();  // initialise m_coeffs avec les 210 valeurs
};