BannerService.cs

using BannerFlow.DataTransferObjects;
using BannerFlow.Models;
using BannerFlow.Repositories;
using BannerFlow.Validators;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace BannerFlow.Services
{
    public class BannerService : IBannerService
    {
        private static IBannerRepository repository;

        private static int key;

        // CTOR
        public BannerService()
        {
            repository = new BannerRepository();
            key = repository.GetLastKey();
            key++;
        }

        // Add an entry logic
        public Banner Add(BannerDTO data)
        {
            if (!HtmlValidator.Validate(data.Html))
            {
                throw new Exception("HTML markup is not valid.");
            }

            Banner input = new Banner();
            input.Created = DateTime.Now;
            input.Modified = DateTime.Now;
            input.Id = key++;
            input.Html = HttpUtility.HtmlDecode(data.Html);

            repository.Add(input);

            return input;
        }

        // Return all entries logic
        public IEnumerable<BannerDTO> GetAll()
        {
            List<BannerDTO> value = new List<BannerDTO>();
            IEnumerable<Banner> banners = repository.GetAll();

            foreach(Banner x in banners)
            {
                value.Add(new BannerDTO(x));
            }
            return value;
        }

        // Return requested entry logic
        public BannerDTO Get(int id)
        {
            BannerDTO value = new BannerDTO(repository.Get(id));

            return value;
        }


        // Edit an entry logic
        public Banner Update(int id, BannerDTO data)
        {
            if (!HtmlValidator.Validate(data.Html))
            {
                throw new Exception("HTML markup is not valid.");
            }

            Banner update = repository.Get(id);
            if (update == null)
            {
                throw new Exception("Banner with the provided ID does not exist.");
            }
            update.Html = HttpUtility.HtmlDecode(data.Html);
            update.Modified = DateTime.Now;

            repository.Update(id, update);
            return update;
        }

        // Delete an entry logic
        public void Delete(int id)
        {
            try
            {
                Banner find = repository.Get(id);
                if(find == null)
                {
                    throw new Exception("Banner with the provided ID does not exist.");
                }
                repository.Delete(id);
            }
            catch(Exception ex)
            {
                throw ex;
            }
        }

        // Returns an HTML of a specified banner
        public BannerDTO GetHtml(int id)
        {
            Banner banner = repository.Get(id);
            BannerDTO value = new BannerDTO();
            value.Html = HttpUtility.HtmlDecode(banner.Html);

            return value;
        }
    }
}