import java.io.File;
    import java.util.ArrayList;
    import java.util.HashMap;
    import java.util.List;
    import java.util.Map;
    import java.util.Scanner;
     
    public class HashData{
      public static void main(String[] args) throws Exception {
        if (args.length != 1) {
          System.out.println("2013ALL.csv");
          System.exit(1);
        }
     
        File input = new File(args[0]);
        List<String> attributes = readAttributes(input);
     
        if (attributes.size() > 0) {
          int index = 0;
          for (String attribute : attributes) {
            System.out.println(String.format("Attribute %d %s", index, attribute));
            index++;
          }
     
          System.out.println(
              String.format("What attribute would you like to summarize (0..%d)?",
                  attributes.size() - 1));
     
          Scanner scanner = new Scanner(System.in);
          index = scanner.nextInt();
     
          if ((index >= attributes.size()) || (index < 0)) {
            System.out.println(String.format("Wrong attribute index %d", index));
          } else {
            System.out.println(
                String.format("Summarizing attribute %d (%s)", index, attributes.get(index)));
            sum(input, index);
          }
        }
      }
     
      private static List<String> readAttributes(File input) throws Exception {
        List<String> list = new ArrayList<String>();
     
        Scanner scanner = new Scanner(input);
        String line;
     
        while (scanner.hasNextLine()) {
          line = scanner.nextLine();
     
          if (line.startsWith("@data")) {
            break;
          }
     
          if (line.startsWith("@attribute")) {
            String[] parts = line.split(" ");
            list.add(parts[1]);
          }
        }
     
        return list;
      }
     
      private static void sum(File input, int index) throws Exception  {
        Scanner scanner = new Scanner(input);
        Map<String, Integer> values = new HashMap<String, Integer>();
        String line, key;
        boolean dataStarted = false;
     
        while (scanner.hasNextLine()) {
          line = scanner.nextLine();
     
          if (line.startsWith("@data")) {
            dataStarted = true;
          } else if (dataStarted) {
            String[] parts = line.split(",");
            key = parts[index];
     
            if (values.containsKey(key)) {
              values.put(key, values.get(key) + 1);
            } else {
              values.put(key, 1);
            }
          }
        }
     
        for (Map.Entry<String, Integer> entry : values.entrySet()) {
          System.out.println(String.format("%s appeared %d times", entry.getKey(), entry.getValue()));
        }
     
        System.out.println(String.format("There were %d unique attributes values.", values.size()));
      }
    }