using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace d2l
{
    class Program
    {
        //d2l <d2l template> <grade file>
        static void Main(string[] args)
        {
            if (args.Length < 2 || args.Length > 32)
            {
                Console.Error.WriteLine("Usage: d2l <d2l template> <grade file> [<question count>]");
                return;
            }
            if (!File.Exists(args[0]))
            {
                Console.Error.WriteLine("Can't find {0}", args[0]);
                return;
            }
            if (!File.Exists(args[1]))
            {
                Console.Error.WriteLine("Can't find {0}", args[1]);
                return;
            }
            int questions = 6;
            if (args.Length == 3)
            {
                if (!int.TryParse(args[2], out questions))
                {
                    Console.Error.WriteLine("Question count was invlaid");
                    return;
                }
            }

            Dictionary<string, int> grades = new Dictionary<string, int>();
            foreach (string gradeline in File.ReadAllLines(args[1]))
            {
                string[] parts = gradeline.Split(',');
                string student = parts[0].Trim();
                int grade = 0;
                for (int i = 1; i <= questions; i++)
                {
                    int score = 0;
                    if (!int.TryParse(parts[i], out score))
                    {
                        Console.Error.WriteLine("{0} non-parsable question score {1}", student, parts[i]);
                    }
                    grade += score;
                }
                if (!grades.ContainsKey(student))
                {
                    grades.Add(student, grade);
                    //Console.WriteLine("{0}={1}", parts[0], grade);
                }
                else
                {
                    Console.Error.WriteLine("{0} submitted multiple results", student);
                }
            }

            bool header = true;
            foreach (string templateline in File.ReadAllLines(args[0]))
            {
                if (header)
                {
                    Console.WriteLine(templateline);
                    header = false;
                }
                else {
                    string[] parts = templateline.Split(',');
                    string student = parts[0].Trim().Substring(1).Trim();
                    int grade = 0;
                    if (grades.ContainsKey(student))
                    {
                        grade = grades[student];
                        Console.Error.WriteLine("{0} scored {1}", student, grade);
                        grades[student] = -1;//mark as recorded
                    }
                    else
                    {
                        Console.Error.WriteLine("{0} does not have a grade", student);
                    }
                    if (parts[4].Trim() == "")
                    {
                        parts[4] = grade.ToString();
                    }

                    string mergeline = string.Join(",", parts);
                    Console.WriteLine(mergeline);
                }
            }

            foreach(KeyValuePair<string, int> entry in grades)
            {
                if (entry.Value != -1)
                {
                    Console.Error.WriteLine("{0} is unknown", entry.Key);
                }
            }
            //Console.ReadKey();
        }
    }
}