using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using AsbCloudApp.Data;
using AsbCloudApp.Exceptions;
using AsbCloudApp.Repositories;
using AsbCloudApp.Services;
using AsbCloudInfrastructure.Services;
using Moq;
using Xunit;

namespace AsbCloudWebApi.Tests.ServicesTests;

public class HelpPageServiceTest
{
    private const string directoryNameHelpPageFiles = "helpPages";

    private static List<HelpPageDto> HelpPages = new()
    {
        new()
        {
            Id = 123,
            IdCategory = 20000,
            Name = "Справка1.pdf",
            Size = 54000,
            UrlPage = "test"
        },
        new()
        {
            Id = 134,
            IdCategory = 20000,
            Name = "Справка2.pdf",
            Size = 51000,
            UrlPage = "test1"
        },
        new()
        {
            Id = 178,
            IdCategory = 10000,
            Name = "Справка3.pdf",
            Size = 49000,
            UrlPage = "test2"
        }
    };
    
    private readonly Mock<IHelpPageRepository> helpPageRepository = new();
    private readonly Mock<IFileStorageRepository> fileStorageRepository = new();

    private readonly IHelpPageService helpPageService;

    public HelpPageServiceTest()
    {
        helpPageService = new HelpPageService(helpPageRepository.Object,
            fileStorageRepository.Object,
            directoryNameHelpPageFiles);
    }

    [Fact]
    public async Task CreateAsync_ShouldReturn_PositiveId()
    {
        //arrange
        int idHelpPage = new Random().Next(1, 100);
        string urlPage = "test";
        int idCategory = 20000;
        string fullName = "test.pdf";
        MemoryStream fileStream = new MemoryStream(Array.Empty<byte>());

        helpPageRepository.Setup(x => x.InsertAsync(It.IsAny<HelpPageDto>(),
                It.IsAny<CancellationToken>()))
            .Returns(() => Task.FromResult(idHelpPage));

        fileStorageRepository.Setup(x => x.SaveFileAsync(It.IsAny<string>(),
            It.IsAny<Stream>(),
            It.IsAny<CancellationToken>()));
        
        //act
        int result = await helpPageService.CreateAsync(urlPage,
            idCategory,
            fullName,
            fileStream,
            CancellationToken.None);

        //assert
        Assert.True(result > 0);
    }

    [Fact]
    public async Task CreateAsync_ShouldReturn_ArgumentsInvalidException()
    {
        //arrange
        string urlPage = "test";
        int idCategory = 20000;
        string fullName = "test.pdf";
        MemoryStream fileStream = new MemoryStream(Array.Empty<byte>());
        bool isExistingHelpPage  = true;
        
        helpPageRepository.Setup(x => x.IsCheckHelpPageWithUrlPageAndIdCategoryAsync(It.IsAny<string>(),
                It.IsAny<int>(),
                It.IsAny<CancellationToken>()))
            .Returns(() => Task.FromResult(isExistingHelpPage));
        
        //act
        Task Result () => helpPageService.CreateAsync(urlPage,
            idCategory,
            fullName,
            fileStream,
            CancellationToken.None);

        //assert
        await Assert.ThrowsAsync<ArgumentsInvalidException>(Result);
    }

    [Fact]
    public async Task UpdateAsync_ShouldReturn_UpdatedHelpPage()
    {
        //arrange
        HelpPageDto helpPage = new()
        {
            Id = 123,
            IdCategory = 134,
            UrlPage = "test",
            Name = "Справка.pdf",
            Size = 54000
        };
        
        int newIdCategory = 451;
        string newFileName = "Новая справка.pdf";
        MemoryStream newFileStream = new MemoryStream(Array.Empty<byte>());
        
        //act
        await helpPageService.UpdateAsync(helpPage,
            newIdCategory,
            newFileName,
            newFileStream,
            CancellationToken.None);
        
        //assert
        Assert.Equal(newFileName, helpPage.Name);
        Assert.Equal(newIdCategory, helpPage.IdCategory);
        Assert.Equal(newFileStream.Length, helpPage.Size);
    }

    [Theory]
    [InlineData(20000, "test")]
    [InlineData(20000, "test1")]
    public async Task GetOrDefaultByUrlPageAndIdCategoryAsync_ShouldReturn_HelpPageDto(int idCategory,
        string urlPage)
    {
        //arrange
        helpPageRepository.Setup(x => x.GetOrDefaultByUrlPageAndIdCategoryAsync(It.IsAny<string>(),
            It.IsAny<int>(), It.IsAny<CancellationToken>()))
            .Returns(() =>
            {
                var helpPage = HelpPages.FirstOrDefault(x =>
                    x.UrlPage == urlPage &&
                    x.IdCategory == idCategory);
                
                return Task.FromResult(helpPage); 
            });
        
        //act
        var result = await helpPageService.GetOrDefaultByUrlPageAndIdCategoryAsync(urlPage,
            idCategory,
            CancellationToken.None);
        
        //assert
        Assert.NotNull(result);
    }
    
    [Theory]
    [InlineData(123)]
    [InlineData(178)]
    public async Task GetOrDefaultByIdAsync_ShouldReturn_HelpPageDto(int id)
    {
        //arrange
        helpPageRepository.Setup(x => x.GetOrDefaultAsync(It.IsAny<int>(), 
                It.IsAny<CancellationToken>()))
            .Returns(() =>
            {
                var helpPage = HelpPages.FirstOrDefault(x => 
                    x.Id == id);
                
                return Task.FromResult(helpPage); 
            });
        
        //act
        var result = await helpPageService.GetOrDefaultByIdAsync(id,
            CancellationToken.None);
        
        //assert
        Assert.NotNull(result);
    }
}