using System.Net;
using System.Threading.Tasks;
using FluentAssertions;
using Moq;
using NUnit.Framework;
using NzbDrone.Common.Disk;
using NzbDrone.Common.Http;
using NzbDrone.Core.MediaCover;
using NzbDrone.Core.Test.Framework;

namespace NzbDrone.Core.Test.MediaCoverTests
{
    [TestFixture]
    public class CoverAlreadyExistsSpecificationFixture : CoreTest<CoverAlreadyExistsSpecification>
    {
        private HttpResponse _httpResponse;

        [SetUp]
        public void Setup()
        {
            _httpResponse = new HttpResponse(null, new HttpHeader(), "", HttpStatusCode.OK);
            Mocker.GetMock<IDiskProvider>().Setup(c => c.GetFileSize(It.IsAny<string>())).Returns(100);
            Mocker.GetMock<IHttpClient>().Setup(c => c.HeadAsync(It.IsAny<HttpRequest>())).Returns(Task.FromResult(_httpResponse));
        }

        private void GivenFileExistsOnDisk()
        {
            Mocker.GetMock<IDiskProvider>().Setup(c => c.FileExists(It.IsAny<string>())).Returns(true);
        }

        private void GivenExistingFileSize(long bytes)
        {
            GivenFileExistsOnDisk();
            Mocker.GetMock<IDiskProvider>().Setup(c => c.GetFileSize(It.IsAny<string>())).Returns(bytes);
        }

        [Test]
        public async Task should_return_false_if_file_not_exists()
        {
            var result = await Subject.AlreadyExists("http://url", "c:\\file.exe");
            result.Should().BeFalse();
        }

        [Test]
        public async Task should_return_false_if_file_exists_but_diffrent_size()
        {
            GivenExistingFileSize(100);
            _httpResponse.Headers.ContentLength = 200;

            var result = await Subject.AlreadyExists("http://url", "c:\\file.exe");
            result.Should().BeFalse();
        }

        [Test]
        public async Task should_return_true_if_file_exists_and_same_size_and_not_corrupt()
        {
            GivenExistingFileSize(100);
            _httpResponse.Headers.ContentLength = 100;
            var result = await Subject.AlreadyExists("http://url", "c:\\file.exe");
            result.Should().BeTrue();
        }

        [Test]
        public async Task should_return_true_if_there_is_no_size_header_and_file_exist()
        {
            GivenExistingFileSize(100);
            var result = await Subject.AlreadyExists("http://url", "c:\\file.exe");
            result.Should().BeFalse();
        }
    }
}