using System;
using System.Threading.Tasks;
using LCU.API.Internal.Operations.IncentiveApi.DataAccess;
using LCU.API.Internal.Operations.IncentiveApi.Services.MicroApiServices;
using LCU.Library.Internal.Exceptions;
using Moq;
using NUnit.Framework;

namespace Application.UnitTests.Services.MicroApiServices
{
    public class FileOperationsApiServiceTest
    {
        private FileOperationsApiService _fileOperationsApiService;
        private Mock<IFileOperationsApiDao> _mockFileOperationsDao;

        [SetUp]
        public void Setup()
        {
            _mockFileOperationsDao = new Mock<IFileOperationsApiDao>();
            _fileOperationsApiService = new FileOperationsApiService(_mockFileOperationsDao.Object);
        }

        [Test]
        public async Task GetFileContent_ValidRequest_Success()
        {
            _mockFileOperationsDao.Setup(s => s.GetFileContent("filePath")).ReturnsAsync("fileContent");

            var fileContent = await _fileOperationsApiService.GetFileContent("filePath");

            _mockFileOperationsDao.Verify(s => s.GetFileContent("filePath"), Times.Once());
            Assert.AreEqual("fileContent", fileContent);
        }

        [Test]
        public void GetFileContent_DaoFails_ExceptionThrown()
        {
            _mockFileOperationsDao.Setup(s => s.GetFileContent("filePath")).ThrowsAsync(new Exception("Failure"));

            Assert.ThrowsAsync<ServiceException>(async () => await _fileOperationsApiService.GetFileContent("filePath"));

            _mockFileOperationsDao.Verify(s => s.GetFileContent("filePath"), Times.Once());
        }
    }
}