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using System;

using System.Linq;

using System.Collections.Generic;

​

public class HelloWorld

{

    public class Response {

        public List<Activity> Activities{get;set;}=new List<Activity>();

        public Filters Filters {get;set;}=new Filters();

    }

    public class Activity{

        public int Id {get;set;}

        public string PostCode {get;set;}

        public string CareOutcome {get;set;}

    }

    public class Filters{

        public List<string> PostCodes {get;set;} = new List<string>();

        public List<string> CareOutcomes {get;set;}=new List<string>();

    }

     static List<Activity> activities=new List<Activity>{

            new Activity {

                Id=1,

                PostCode="G62",

                CareOutcome="Care Outcome 1"

            },

             new Activity {

                Id=2,

                PostCode="G62",

                CareOutcome="Care Outcome 2"

            },

            new Activity {

                Id=2,

                PostCode="G63",

                CareOutcome="Care Outcome 1"

            },

            new Activity {

                Id=2,

                PostCode="G63",

                CareOutcome="Care Outcome 2"

            },

            new Activity {

                Id=3,

                PostCode="G64",

                CareOutcome="Care Outcome 3"

            }

        };

    public static void Main(string[] args)

    {

        /*var response= GetResponse(new Filters(){

            PostCodes= new List<string>{"G64"}

        });*/

        var response= GetResponse(new Filters(){

            PostCodes= new List<string>{"G62"},

            CareOutcomes=new List<string>{"Care Outcome 1"}

        });

        /*var response= GetResponse(new Filters(){

            PostCodes= new List<string>{"G62"}

        });*/

        Console.WriteLine("-----------------Activities--------------------");

        foreach(var activity in response.Activities){

        Console.WriteLine ($"{activity.Id} | {activity.PostCode} | {activity.CareOutcome}");    

        }

        Console.WriteLine("-----------------Care Outcome Filters-----------");

        foreach(var careOutcomeFilter in response.Filters.CareOutcomes)

        Console.WriteLine(careOutcomeFilter);

        Console.WriteLine("-----------------PostCode Filters---------------");

        foreach(var postCodeFilter in response.Filters.PostCodes)

        Console.WriteLine(postCodeFilter);

    }

    public static Response GetResponse(Filters filterRequest){

        var response= new Response();

        response.Activities= activities.Where(x=>(!filterRequest.CareOutcomes.Any() || filterRequest.CareOutcomes.Contains(x.CareOutcome)) && (!filterRequest.PostCodes.Any() ||filterRequest.PostCodes.Contains(x.PostCode))).ToList();

        response.Filters.PostCodes=response.Activities.Select(x=>x.PostCode).Distinct().ToList();

        response.Filters.CareOutcomes=response.Activities.Select(x=>x.CareOutcome).Distinct().ToList();

       return response;

    }

}