package archivos;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.EOFException;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

public class Temperatura
{
    public static String nombreArchivo = "temperaturas.dat";
    public static void escribir()
    {
        String dia = "Viernes 5 de junio de 2020";
        DataOutputStream dataOutputStream = null;
        try
        {
            dataOutputStream = new DataOutputStream(new FileOutputStream(nombreArchivo));
            dataOutputStream.writeUTF(dia);
            for (int i = 0; i<24;i++)
            {
                double temp,presion;
                presion = getPresionRandom();
                temp = getTempRandom();
                dataOutputStream.writeInt(i);
                dataOutputStream.writeDouble(temp);
                dataOutputStream.writeDouble(presion);
            }
            dataOutputStream.close();
        }
        catch (IOException e)
        {
            e.printStackTrace();
        }
    }

    private static double getTempRandom()
    {
        double MAX = 50;
        double MIN = -10;
        return (Math.random() * (MAX - MIN)+MIN);
    }

    private static double getPresionRandom()
    {
        double MAX = 1000;
        double MIN = 100;
        return (Math.random() * (MAX - MIN)+MIN);
    }

    public static void leer()
    {
        FileInputStream fileInputStream;
        DataInputStream dataInputStream;

        try
        {
            fileInputStream = new FileInputStream(nombreArchivo);
            dataInputStream = new DataInputStream(fileInputStream);
            String dia;
            int hora;
            double presion, temperatura;
            boolean bandera = true;
            dia = dataInputStream.readUTF();

            System.out.println("El día es ... "+dia);

            while (bandera)
            {
                hora = dataInputStream.readInt();
                temperatura = dataInputStream.readDouble();
                presion = dataInputStream.readDouble();

                System.out.println("La hora es de ... "+hora+"\n");
                System.out.println("La temperatura es de ... "+temperatura+"\n");
                System.out.println("La presion es de ... "+presion+"\n");
            }

            dataInputStream.close();
        }
        catch (FileNotFoundException ex)
        {
            ex.printStackTrace();
        }
        catch (EOFException ex)
        {
            System.out.println("FIN\n");
        }
        catch (IOException exception)
        {
            exception.printStackTrace();
        }
    }
}