using Microsoft.eShopWeb.ApplicationCore.Entities;
using Moq;
using System.Collections.Generic;
using System.Linq;
using Xunit;

namespace Microsoft.eShopWeb.UnitTests.ApplicationCore.Specifications
{
    public class CatalogItemsSpecification
    {
        [Fact]
        public void MatchesSpecificCatalogItem()
        {
            var catalogItemIds = new int[] { 1 };
            var spec = new eShopWeb.ApplicationCore.Specifications.CatalogItemsSpecification(catalogItemIds);

            var result = GetTestCollection()
                .AsQueryable()
                .Where(spec.WhereExpressions.FirstOrDefault());

            Assert.NotNull(result);
            Assert.Single(result.ToList());
        }

        [Fact]
        public void MatchesAllCatalogItems()
        {
            var catalogItemIds = new int[] { 1, 3 };
            var spec = new eShopWeb.ApplicationCore.Specifications.CatalogItemsSpecification(catalogItemIds);

            var result = GetTestCollection()
                .AsQueryable()
                .Where(spec.WhereExpressions.FirstOrDefault());

            Assert.NotNull(result);
            Assert.Equal(2, result.ToList().Count);
        }

        private List<CatalogItem> GetTestCollection()
        {
            var catalogItems = new List<CatalogItem>();

            var mockCatalogItem1 = new Mock<CatalogItem>(1, 1, "Item 1 description", "Item 1", 1.5m, "Item1Uri");
            mockCatalogItem1.SetupGet(x => x.Id).Returns(1);

            var mockCatalogItem3 = new Mock<CatalogItem>(3, 3, "Item 3 description", "Item 3", 3.5m, "Item3Uri");
            mockCatalogItem3.SetupGet(x => x.Id).Returns(3);

            catalogItems.Add(mockCatalogItem1.Object);
            catalogItems.Add(mockCatalogItem3.Object);

            return catalogItems;
        }
    }
}