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

namespace RomashkiTests;

internal class DiscountDataModelTests
{
    [Test]
    public void BuyerIdIsEmptyTest()
    {
        var discount = CreateDataModel(null, DateTime.Now, 10);
        Assert.That(() => discount.Validate(), Throws.TypeOf<ValidationException>());
        discount = CreateDataModel(string.Empty, DateTime.Now, 10);
        Assert.That(() => discount.Validate(), Throws.TypeOf<ValidationException>());
    }
    [Test]
    public void BuyerIdIsNotGuidTest()
    {
        var discount = CreateDataModel("buyerId", DateTime.Now, 10);
        Assert.That(() => discount.Validate(), Throws.TypeOf<ValidationException>());
    }
    [Test]
    public void DiscountIsLessOrMoreTest()
    {
        var discount = CreateDataModel(Guid.NewGuid().ToString(), DateTime.Now, -1);
        Assert.That(() => discount.Validate(), Throws.TypeOf<ValidationException>());
        discount = CreateDataModel(Guid.NewGuid().ToString(), DateTime.Now, 101);
        Assert.That(() => discount.Validate(), Throws.TypeOf<ValidationException>());
    }
    [Test]
    public void AllFieldsIsCorrectTest()
    {
        var buyerId = Guid.NewGuid().ToString();
        var discountDate = DateTime.Now.AddDays(-3).AddMinutes(-5);
        var discountSize = 10;
        var discount = CreateDataModel(buyerId, discountDate, discountSize);
        Assert.That(() => discount.Validate(), Throws.Nothing);
        Assert.Multiple(() =>
        {
            Assert.That(discount.BuyerId, Is.EqualTo(buyerId));
            Assert.That(discount.DiscountDate, Is.EqualTo(discountDate));
            Assert.That(discount.DiscountSize, Is.EqualTo(discountSize));
        });
    }
    private static DiscountDataModel CreateDataModel(string? buyerId, DateTime discountDate, double discountSize) => 
        new(buyerId, discountDate, discountSize);

}