monorepo/LCU.API.Internal.RepoApi/LCU.API.Internal.RepoApiTests/ServiceTests/RepoLetterServiceTests.cs

using LCU.API.Collections.CollectionsApiLib.Models;
using LCU.API.Internal.RepoApi.Old_Repo_DataAccess;
using LCU.API.Internal.RepoApi.Old_Repo_Exceptions;
using LCU.API.Internal.RepoApi.Repos.Models;
using LCU.API.Internal.RepoApi.Repos.Repositories;
using LCU.API.Internal.RepoApi.Old_Repo_Services;

namespace LCU.API.Internal.RepoApiTests.ServiceTests
{
    public class RepoLetterServiceTests
    {
        private readonly Mock<ILetterRepository> _mockLetterRepository;
        private readonly Mock<ICollectionsDao> _mockCollectionsDao;
        private readonly RepoLetterService _service;

        public RepoLetterServiceTests()
        {
            _mockLetterRepository = new Mock<ILetterRepository>();
            _mockCollectionsDao = new Mock<ICollectionsDao>();
            _service = new RepoLetterService(_mockLetterRepository.Object, _mockCollectionsDao.Object);
        }

        [Fact]
        public async Task ListByAccountIdAsync_ReturnsEmptyList_WhenNoCollectionsLetters()
        {
            // Arrange
            int accountId = 1;
            _mockCollectionsDao
                .Setup(x => x.RetrieveHistoryAsync(accountId))
                .ReturnsAsync(new List<TemenosHistory>());

            // Act
            var result = await _service.ListByAccountIdAsync(accountId);

            // Assert
            Assert.Empty(result);
        }

        [Fact]
        public async Task ListByAccountIdAsync_ReturnsProcessedLetters_WhenCollectionsLettersExist()
        {
            // Arrange
            int accountId = 1;
            var collectionsHistory = new List<TemenosHistory>
        {
            new TemenosHistory { Type = HistoryType.Letter, Message = "Test Message", Created = DateTime.UtcNow }
        };
            var letters = new List<Letter>
        {
            new Letter { LetterDescription = "Test", DaysToWait = 5, ActionCode = "A1" }
        };

            _mockCollectionsDao
                .Setup(x => x.RetrieveHistoryAsync(accountId))
                .ReturnsAsync(collectionsHistory);

            _mockLetterRepository
                .Setup(x => x.ListAsync())
                .ReturnsAsync(letters);

            // Act
            var result = await _service.ListByAccountIdAsync(accountId);

            // Assert
            Assert.Single(result);
            Assert.Equal("Test Message", result.First().NoticeType);
        }

        [Fact]
        public async Task ListByAccountIdAsync_ThrowsServerErrorException_OnGeneralException()
        {
            // Arrange
            int accountId = 1;
            _mockCollectionsDao
                .Setup(x => x.RetrieveHistoryAsync(accountId))
                .ThrowsAsync(new Exception("Test Exception"));

            // Act & Assert
            await Assert.ThrowsAsync<ServerErrorException>(() => _service.ListByAccountIdAsync(accountId));
        }

        [Fact]
        public void ProcessLetters_ThrowsMissingRequirementException_WhenLetterDescriptionIsNull()
        {
            // Arrange
            var collectionsLetters = new List<TemenosHistory>
        {
            new TemenosHistory { Message = "Test Message", Created = DateTime.UtcNow }
        };
            var letters = new List<Letter>
        {
            new Letter { LetterDescription = null }
        };

            // Act & Assert
            Assert.Throws<MissingRequirementException>(() =>
                RepoLetterService.ProcessLetters(collectionsLetters, letters));
        }

        [Fact]
        public void ProcessLetters_ReturnsProcessedLetters_WhenValidDataProvided()
        {
            // Arrange
            var collectionsLetters = new List<TemenosHistory>
        {
            new TemenosHistory { Message = "Test Message", Created = DateTime.UtcNow }
        };
            var letters = new List<Letter>
        {
            new Letter { LetterDescription = "Test", DaysToWait = 5, ActionCode = "A1" }
        };

            // Act
            var result = RepoLetterService.ProcessLetters(collectionsLetters, letters);

            // Assert
            Assert.Single(result);
            Assert.Equal("Test Message", result.First().NoticeType);
        }
    }
}