adding initial project and solution files

src/Web/Services/CatalogService.cs

@@ -0,0 +1,88 @@
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using Microsoft.eShopWeb.Models;
+using Microsoft.AspNetCore.Mvc.Rendering;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.Options;
+using Microsoft.eShopWeb.Infrastructure;
+using Microsoft.eShopWeb.ViewModels;
+
+namespace Microsoft.eShopWeb.Services
+{
+    public class CatalogService : ICatalogService
+    {
+        private readonly CatalogContext _context;
+        private readonly IOptionsSnapshot<CatalogSettings> _settings;
+        
+        public CatalogService(CatalogContext context, IOptionsSnapshot<CatalogSettings> settings)
+        {
+            _context = context;
+            _settings = settings;            
+        }
+
+        public async Task<Catalog> GetCatalogItems(int pageIndex, int itemsPage, int? brandId, int? typeId)
+        {
+            var root = (IQueryable<CatalogItem>)_context.CatalogItems;
+
+            if (typeId.HasValue)
+            {
+                root = root.Where(ci => ci.CatalogTypeId == typeId);
+            }
+
+            if (brandId.HasValue)
+            {
+                root = root.Where(ci => ci.CatalogBrandId == brandId);
+            }
+
+            var totalItems = await root
+                .LongCountAsync();
+
+            var itemsOnPage = await root
+                .Skip(itemsPage * pageIndex)
+                .Take(itemsPage)
+                .ToListAsync();
+
+            itemsOnPage = ComposePicUri(itemsOnPage);
+
+            return new Catalog() { Data = itemsOnPage, PageIndex = pageIndex, Count = (int)totalItems };           
+        }
+
+        public async Task<IEnumerable<SelectListItem>> GetBrands()
+        {
+            var brands = await _context.CatalogBrands.ToListAsync();
+            var items = new List<SelectListItem>();
+            items.Add(new SelectListItem() { Value = null, Text = "All", Selected = true });
+            foreach (CatalogBrand brand in brands)
+            {
+                items.Add(new SelectListItem() { Value = brand.Id.ToString(), Text = brand.Brand });
+            }
+
+            return items;
+        }
+
+        public async Task<IEnumerable<SelectListItem>> GetTypes()
+        {
+            var types = await _context.CatalogTypes.ToListAsync();
+            var items = new List<SelectListItem>();
+            items.Add(new SelectListItem() { Value = null, Text = "All", Selected = true });
+            foreach (CatalogType type in types)
+            {
+                items.Add(new SelectListItem() { Value = type.Id.ToString(), Text = type.Type });
+            }
+
+            return items;
+        }
+
+        private List<CatalogItem> ComposePicUri(List<CatalogItem> items)
+        {
+            var baseUri = _settings.Value.CatalogBaseUrl;                      
+            items.ForEach(x =>
+            {
+                x.PictureUri = x.PictureUri.Replace("http://catalogbaseurltobereplaced", baseUri);
+            });
+
+            return items;
+        }
+    }
+}