using System;

using System.Collections.Generic;

using System.Collections.ObjectModel;

using System.Linq;

using System.Security.Cryptography;

using System.Text;

​

using RestSharp;

public class Program

{

    public static void Main()

    {

         //1. List time zones in .NET

            var timeZones = GetTimeZones();

            foreach (var tz in timeZones)

            {

                Console.WriteLine(string.Format("{0}  =>  {1}", tz.DisplayName, tz.StandardName));

            }

​

            //2. List of dates of the year

            for (int i = 1; i < 13; i++)

            {

               var dates =  GetDates(2018, i);              

                Console.WriteLine(String.Format("{0:y}", dates.First().Date));

                dates.ForEach(d => Console.WriteLine(String.Format("{0:D}", d.Date)));

​

            }

            //3. Given a user and password use SHA1 to encode decode password

​

            //SHA1 is not an encryption algorithm, so it is not possible to decrypt it, so the password string is not decrypted back to original string.

            //To compare the signature and hash already stored in database

​

            // steps

            // get hash value stored in database and store in variable1.

            var variable1 = "10d1e5bc4f55c05050f4ae697d0703f7d63af0a4";

            // compute hash for your input string and store in variable2.

            string inputString  = "SomePassword";

            var variable2 = Hash(inputString);

            // compare variable1 and variable2.

            if (variable1.Equals(variable2))

            {

                Console.WriteLine("Password stored in DB is equals to the password entered from the input");

                //continue with login funtionality               

​

            }

            // 4.   Complete the TODO statements

            List<Dog> dogs = new List<Dog>();

            dogs.Add(new Dog("Fido"));

            dogs.Add(new Dog("Bob"));

            dogs.Add(new Dog("Adam"));

            dogs.Sort();

            foreach (Dog dog in dogs)

                Console.WriteLine(dog.Describe());

            Console.WriteLine(dogs[0].CompareTo(dogs[2]));

            Console.WriteLine(dogs[1].CompareTo(dogs[2]));

            //5. Using reflection enumerate all the properties of the given class

            foreach (var prop in typeof(Course).GetProperties())

            {

                Console.WriteLine("{0}", prop.Name);

            }

​

            var course = new Course {Id =1 , Name = "Software", Term = "Something", Level = 1 };

            foreach (var prop in course.GetType().GetProperties())

            {

                Console.WriteLine("{0} = {1}", prop.Name, prop.GetValue(course, null));

            }

            //6.Given this code

            List<Course> courses = new List<Course>();

            courses.Add(new Course() { Id = 1, Name = "Maths", Level = 1 });

            courses.Add(new Course() { Id = 2, Name = "Science", Level = 1 });

            courses.Add(new Course() { Id = 3, Name = "Physics", Level = 2 });

​

            var firstCourse = courses.OrderBy(c =>c.Id).First();

            Console.WriteLine("The first course is {0}", firstCourse.Name);

            var level1List = courses.Where(c => c.Level == 1).ToList();

            Console.WriteLine("The courses of level 1 are");

            level1List.ForEach(c => Console.WriteLine(c.Name));

            //7. Using this boilerplate   https://dotnetfiddle.net/VhwfFv

            var client = new RestClient("https://www.metaweather.com");

​

            var request = new RestRequest("/api/location/search/?query=san", Method.GET);

​

            IRestResponse response = client.Execute(request);

            var content = response.Content;

            Console.WriteLine(content);

    }

    /// <summary>

    /// To List time zones in .NET

    /// </summary>

    /// <returns>Read Only Collection of TimeZoneInfo</returns>

    static ReadOnlyCollection<TimeZoneInfo> GetTimeZones()

    {

        ReadOnlyCollection<TimeZoneInfo> tz;

        tz = TimeZoneInfo.GetSystemTimeZones();

        return tz;

    }

​

    /// <summary>

    /// List of dates (DateTime)

    /// </summary>

    /// <param name="year">year</param>

    /// <param name="month">month</param>

    /// <returns></returns>

    public static List<DateTime> GetDates(int year, int month)

    {

        return Enumerable.Range(1, DateTime.DaysInMonth(year, month))  // Days: 1, 2 ... 31 etc.

            .Select(day => new DateTime(year, month, day)) // Map each day to a date

            .ToList(); // Load dates into a list

    }

    /// <summary>

    /// To hash some string

    /// </summary>

    /// <param name="password">string password</param>

    /// <returns>Return the hash value</returns>

    public static string Hash(string password)

    {

        var hash = (new SHA1Managed()).ComputeHash(Encoding.UTF8.GetBytes(password));

        return string.Join("", hash.Select(b => b.ToString("x2")).ToArray());

    }

    interface IAnimal

    {

        string Describe();

        string Name

        {

            get;

            set;

        }

    }

    class Dog : IAnimal, IComparable<Dog>

    {

        private string _name;

        public Dog(string name)

        {

            _name = name;

        }

        public string Describe()

        {

            return string.Format("Description of the dog {0}, he is black and strong,...", _name);

        }

        public int CompareTo(Dog dog)

        {

            if (this._name.Equals(dog.Name)) return 0;                

            return 1;

        }

        public string Name

        {

            get

            {

                return _name;

            }

            set

            {

                _name = value;

            }

        }

    }

    public class Course

    {

        public int Id { get; set; }

        public string Name { get; set; }

        public string Term { get; set; }

         public int Level { get; set; }

    }

​

}