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package revenueProcessor;

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Set;

public class Solution{
  
  public static void main(String[] args) throws IOException{
    Solution obj = new Solution();
    obj.process();
  }
  
  void process() throws IOException {
    String fileLine;
    String delimiter = "\\|";
    List<String> linesInFile = new LinkedList<String>();
    List<PurchaseRecord> record = new ArrayList<PurchaseRecord>();
    Set<String> distinctNames = new HashSet<String>();
    Set<String> distinctCategories = new HashSet<String>();
    FileReader newFile = new FileReader("c:/test.txt");
    BufferedReader buffer = new BufferedReader(newFile);
    // Store file contents into a String array by Line
    do
    { 
      fileLine = buffer.readLine();
      if(fileLine != null){
        linesInFile.add(fileLine);
      }
    } while(fileLine != null);
    buffer.close();
    /**
     * Very important for loop
     * Create a new PurchaseRecord object for each line above
     * Store each Purchase record object in an ArrayList called record
     * Store each distinct name in a HashSet called distinctNames
     * Store each distinct category in a Distinct Category called distinctCategories
     */
    
    for(String line: linesInFile){
      String[] temp = line.split(delimiter);
      PurchaseRecord pr = new PurchaseRecord();
      pr.name = temp[0];
      pr.category = temp[1];
      pr.description = temp[2];
      pr.cost = temp[3];
      distinctNames.add(pr.name);
      distinctCategories.add(pr.category);
      record.add(pr);
    }
    //Sort the ArrayList record by PurchaseRecord.name
    Collections.sort(record, PurchaseRecord.recordNameComparator);
    calculateRecordByName(record, distinctNames);
    calculateRecordByNameAndCategory(record, distinctNames, distinctCategories);
  }
  
  void calculateRecordByName(List<PurchaseRecord> record, Set<String> allNames){
    System.out.println("Total Revenue By Customer:");
    double sum;
    for(String name : allNames){
      sum = 0;
      for(PurchaseRecord pr2 : record){
        if(name.equals(pr2.name)){
          sum = sum + pr2.costInt();
        }
      }
      printRecordByName(name, sum);
    }
    System.out.println("");
  }
  
  void calculateRecordByNameAndCategory(List<PurchaseRecord> record, 
      Set<String> allNames, Set<String> allCategories){
    double sum;
    for(String name : allNames){
      System.out.println("Purchases by "+name);
      for(String category : allCategories){
        sum = 0;
        for(PurchaseRecord pr : record){
          if(name.equals(pr.name) && category.equals(pr.category)){
            sum = sum + pr.costInt();
          }
          
        }
        printRecordByCategory(category, sum);
      }
      System.out.println("");
    }
  }
  
  void printRecordByName(String name, double revenue){
    System.out.println(name+": $"+ revenue);
  }
  
  void printRecordByCategory(String category, double revenue){
    if(revenue > 0){
      System.out.println(category+": $"+revenue);
    }
    
  }
}
package revenueProcessor;

import java.util.Comparator;

public class PurchaseRecord{
  String name;
  String category;
  String description;
  String cost;

  public double costInt(){
    return Double.parseDouble(cost);
  }
  
  public static Comparator<PurchaseRecord> recordNameComparator
              = new Comparator<PurchaseRecord>(){

    @Override
    public int compare(PurchaseRecord r1, PurchaseRecord r2) {
      String recordName1 = r1.name;
      String recordName2 = r2.name;
      return recordName1.compareTo(recordName2);
    }
    
  };


  
}