package amphis;

import java.io.File;
import java.io.FileNotFoundException;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Scanner;
import java.util.TreeMap;

// illustration de l'utilisation de TreeMap sur des données de consommation
// électrique en France récupérées sur
// https://www.data.gouv.fr/fr/datasets/consommation-quotidienne-brute/

class Date implements Comparable<Date> {
  final int year, month, day;
  final int hours, minutes;

  // format "15/04/2015" et "12:30"
  Date(String d, String t) {
    String[] dc = d.split("/");
    this.day = Integer.parseInt(dc[0]);
    this.month = Integer.parseInt(dc[1]);
    this.year = Integer.parseInt(dc[2]);
    String[] tc = t.split(":");
    this.hours = Integer.parseInt(tc[0]);
    this.minutes = Integer.parseInt(tc[1]);
  }

  @Override
  public int compareTo(Date that) {
    if (this.year != that.year) return this.year - that.year;
    if (this.month != that.month) return this.month - that.month;
    if (this.day != that.day) return this.day - that.day;
    if (this.hours != that.hours) return this.hours - that.hours;
    return this.minutes - that.minutes;
  }

  @Override
  public String toString() {
      return String.format("%02d", this.day) + "/" +
             String.format("%02d", this.month) + "/" + this.year + " " +
             String.format("%02d", this.hours) + ":" +
             String.format("%02d", this.minutes);

  }

}

class Amphi5 {

  public static void main(String[] args) throws FileNotFoundException {
    double start = System.currentTimeMillis();
    Scanner sc = new Scanner(new File("consommation-quotidienne-brute.csv"));
    sc.nextLine(); // ignorer les entêtes
    // on remplit un dictionnaire date -> consommation électrique
    TreeMap<Date, Integer> map = new TreeMap<>();
    while (sc.hasNextLine()) {
      String s = sc.nextLine();
      String[] col = s.split(";");
      Date e = new Date(col[1], col[2]);
      int v = Integer.parseInt(col[8]);
      map.put(e, v);
    }
    sc.close();
    System.out.println(map.size() + " entrées entre "
                       + map.firstKey() + " et " + map.lastKey());

    // exemple d'opération sur TreeMap : on récupère la consommation
    // d'octobre 2015
    Date from = new Date("01/10/2015", "00:00");
    Date to   = new Date("31/10/2015", "23:30");
    Map<Date, Integer> oct2015 = map.subMap(from, to);
    System.out.println("octobre 2015 : " + oct2015.size() + " entrées");
    int total = 0;
    for (Entry<Date, Integer> e : oct2015.entrySet())
      total += e.getValue();
    System.out.println("total : " + total + " MWh");

    System.err.println((System.currentTimeMillis() - start) + " ms");
  }



}