using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using RomashkiContracts.DataModels;
using RomashkiContracts.Exceptions;

namespace RomashkiTests
{
    [TestFixture]
    internal class ProductHistoryDataModelTests
    {
        [Test]
        public void ProductIdIsNullOrEmptyTest()
        {
            var product = CreateDataModel(null, 10);
            Assert.That(() => product.Validate(), Throws.TypeOf<ValidationException>());
            product = CreateDataModel(string.Empty, 10);
            Assert.That(() => product.Validate(), Throws.TypeOf<ValidationException>());
        }
        [Test]
        public void ProductIdIsNotGuidTest()
        {
            var product = CreateDataModel("id", 10);
            Assert.That(() => product.Validate(), Throws.TypeOf<ValidationException>());
        }
        [Test]
        public void OldPriceIsLessOrZeroTest()
        {
            var product = CreateDataModel(Guid.NewGuid().ToString(), 0);
            Assert.That(() => product.Validate(), Throws.TypeOf<ValidationException>());
            product = CreateDataModel(Guid.NewGuid().ToString(), -10);
            Assert.That(() => product.Validate(), Throws.TypeOf<ValidationException>());
        }
        [Test]
        public void AllFieldsIsCorrectTest()
        {
            var productId = Guid.NewGuid().ToString();
            var oldPrice = 10;
            var productHistory = CreateDataModel(productId, oldPrice);
            Assert.That(() => productHistory.Validate(), Throws.Nothing);
            Assert.Multiple(() =>
            {
                Assert.That(productHistory.ProductId, Is.EqualTo(productId));
                Assert.That(productHistory.OldPrice, Is.EqualTo(oldPrice));
                Assert.That(productHistory.ChangeDate,
                Is.LessThan(DateTime.UtcNow));
                Assert.That(productHistory.ChangeDate,
                Is.GreaterThan(DateTime.UtcNow.AddMinutes(-1)));
            });
        }
        private static ProductHistoryDataModel CreateDataModel(string? productId, double oldPrice) => new(productId, oldPrice);
    }

}