using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

​

    public class Program

    {

        static List<Person> people = Database.GetPeople();

​

        public static void Main(string[] args)

        {

            bool running = true;

            Console.WriteLine("Program START");

            while(running)

            {

                Console.WriteLine("Select a command: list, add, exit");

                string command = Console.ReadLine();

                if (command == "list")

                {

                    List();

                }

                if (command == "add")

                {

                    Add();

                }

                /* TODO: Implement the following additional commands:

                   edit - edits an existing record

                   delete - deletes an existing record

                   listbyname - order by Name A-Z

                   listbyid - order by Id

                   listmen - list men only

                   listwomen - list women only

                   listbyscore - list by score highest to lowest

                   purgefailure - delete people whose score is lower than 70

                   *advanced add function - make it such that the command below will add a new person quickly given the inputs*

                   add Name:Alvin Paul Malinis,Gender:Male,Score:99

                */

                /* TODO: There is Score information for each person (see below for more information) 

                Please display the score on every list */

                if (command == "exit")

                {

                    running = false;

​

                }

            }

​

            Console.WriteLine("Program END");

        }

​

        static void List()

        {

            /* TODO: Remove this hard-coded longest name length 

            and determine programatically how many characters is the 

            longest name of a person in people 

            in such a way that the list commands will pad whitespace to accomodate 

            */

            int namelength = 17;

​

            Console.WriteLine("=======PEOPLE=======");

​

            /* TODO: There is Score information for each person. 

               Please display the score on every list */

            /* TODO: String manipulation below is very inefficient

              Change the implementation to use StringBuilder instead */

            Console.WriteLine("Id  " + "Name".PadRight(namelength + 2) + "Gender");

            foreach(var person in people)

            {

                Console.WriteLine(person.Id.ToString().PadRight(4) + person.Name.PadRight(namelength + 2), person.Gender.ToString());

            }

        }

​

        static void Add()

        {

            /* TODO: System must be robust enough to check for invalid inputs.

            For example, you should not allow empty fields.

            If invalid input detected, repeat the action of inputting the value.

            Also, if the name already exists in the database, display a message that 

            "Person already exists in the database", then repeat the action of inputting the name.

            */

             /* TODO: User must avoid inputting the Id, instead this should be 

             automatically incremented and generated.

             */

            Console.WriteLine("Input Id#");

            string id = Console.ReadLine();

            Console.WriteLine("Input Name");

            string name = Console.ReadLine();

            Console.WriteLine("Input Gender");

            string gender = Console.ReadLine();

​

            Person person = new Person();

            person.Id = Convert.ToInt32(id);

            person.Name = name;

            person.Gender = gender;

​

            people.Add(person);

        }

        static void Delete()

        {

            Database.

        }

    }

​

    public class Database

    {

        public static List<Person> GetPeople()

        {

            /* TODO: There is Score information for each person. 

           Please pre-define the following scores for

           each existing person:

           John Doe - 60

           Jane Doe - 90

           Juan Dela Cruz - 95

           Juanita Dela Cruz - 90

           Remember that the commands must also input scores as well (ex. add, edit, delete)

            */

​

            var result = new List<Person>();

​

            result.Add(new Person()

            {

                Id = 2, Name = "John Doe", Gender = "Male"

            });

​

            result.Add(new Person()

            {

                Id = 3, Name = "Jane Doe", Gender = "Female"

            });

​

            result.Add(new Person()

            {

                Id = 1, Name = "Juan Dela Cruz", Gender = "Male"

            });

​

            result.Add(new Person()

            {

                Id = 4, Name = "Juanita Dela Cruz", Gender = "Female"

            });

​

            return result;

        }

    }

​

    public class Person

    {

        public int Id { get; set; }

        public string Name { get; set; }

​

        /* TODO: Use the Gender enum below and change the Type of this property from string to Gender

           Also, any function that manipulates this data should be checked for sanity.

           For example, only inputting "M", "Male" or "m" is allowed for Male. 

           System must be robust enough to check for invalid inputs.

           If invalid input detected, repeat the action of inputting the value.

         */

        public string Gender { get; set; }

​

        /* TODO: There is Score information for each person. 

           Please implement a new Score property here

         */

​

    }

    public enum Gender

    {

        Male,

        Female

    }

​