using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Options;
using Moq;
using PowderCoating.Application.Configuration;
using PowderCoating.Application.Interfaces;
using PowderCoating.Application.Services;
using PowderCoating.Core.Enums;

namespace PowderCoating.UnitTests;

public class JobPhotoServiceTests
{
    [Fact]
    public async Task SaveJobPhotoAsync_ReturnsError_WhenFileMissing()
    {
        var service = CreateService();

        var result = await service.SaveJobPhotoAsync(null!, 1, 2);

        Assert.False(result.Success);
        Assert.Equal("No file was uploaded.", result.ErrorMessage);
    }

    [Fact]
    public async Task SaveJobPhotoAsync_ReturnsError_WhenFileTooLarge()
    {
        var service = CreateService();
        var file = CreateFormFile("big.jpg", 10 * 1024 * 1024 + 1);

        var result = await service.SaveJobPhotoAsync(file, 1, 2);

        Assert.False(result.Success);
        Assert.Equal("Photo must be smaller than 10 MB.", result.ErrorMessage);
    }

    [Fact]
    public async Task SaveJobPhotoAsync_ReturnsError_WhenExtensionNotAllowed()
    {
        var service = CreateService();
        var file = CreateFormFile("notes.txt");

        var result = await service.SaveJobPhotoAsync(file, 1, 2);

        Assert.False(result.Success);
        Assert.Equal("Only JPG, PNG, GIF, and WebP images are allowed.", result.ErrorMessage);
    }

    [Fact]
    public async Task SaveJobPhotoAsync_ReturnsBlobError_WhenUploadFails()
    {
        var blobService = new Mock<IAzureBlobStorageService>();
        blobService
            .Setup(x => x.UploadAsync("jobimages", It.IsAny<string>(), It.IsAny<Stream>(), "image/png"))
            .ReturnsAsync((false, "upload failed"));

        var service = CreateService(blobService);

        var result = await service.SaveJobPhotoAsync(CreateFormFile("photo.png"), 9, 7);

        Assert.False(result.Success);
        Assert.Equal("upload failed", result.ErrorMessage);
    }

    [Fact]
    public async Task SaveJobPhotoAsync_UsesTenantScopedBlobPath_WhenSuccessful()
    {
        var blobService = new Mock<IAzureBlobStorageService>();
        blobService
            .Setup(x => x.UploadAsync("jobimages", It.IsAny<string>(), It.IsAny<Stream>(), "image/webp"))
            .ReturnsAsync((true, string.Empty));

        var service = CreateService(blobService);

        var result = await service.SaveJobPhotoAsync(CreateFormFile("photo.webp"), 9, 7, "caption", JobPhotoType.After);

        Assert.True(result.Success);
        Assert.StartsWith("7/job-photos/9/", result.FilePath);
        Assert.EndsWith(".webp", result.FilePath);
    }

    [Fact]
    public async Task DeleteJobPhotoAsync_ReturnsError_WhenPathMissing()
    {
        var service = CreateService();

        var result = await service.DeleteJobPhotoAsync(string.Empty);

        Assert.False(result.Success);
        Assert.Equal("File path is required.", result.ErrorMessage);
    }

    [Fact]
    public async Task GetJobPhotoAsync_ReturnsError_WhenPathMissing()
    {
        var service = CreateService();

        var result = await service.GetJobPhotoAsync(" ");

        Assert.False(result.Success);
        Assert.Equal("File path is required.", result.ErrorMessage);
        Assert.Empty(result.FileContent);
    }

    [Fact]
    public async Task JobPhotoExistsAsync_ReturnsFalse_WhenPathMissing()
    {
        var service = CreateService();

        var result = await service.JobPhotoExistsAsync(null!);

        Assert.False(result);
    }

    [Fact]
    public async Task GetJobPhotoAsync_ProxiesBlobDownload()
    {
        var blobService = new Mock<IAzureBlobStorageService>();
        blobService
            .Setup(x => x.DownloadAsync("jobimages", "7/job-photos/9/photo.jpg"))
            .ReturnsAsync((true, new byte[] { 1, 2 }, "image/jpeg", string.Empty));

        var service = CreateService(blobService);

        var result = await service.GetJobPhotoAsync("7/job-photos/9/photo.jpg");

        Assert.True(result.Success);
        Assert.Equal("image/jpeg", result.ContentType);
        Assert.Equal(new byte[] { 1, 2 }, result.FileContent);
    }

    [Fact]
    public async Task JobPhotoExistsAsync_UsesBlobServiceForValidPath()
    {
        var blobService = new Mock<IAzureBlobStorageService>();
        blobService
            .Setup(x => x.ExistsAsync("jobimages", "7/job-photos/9/photo.jpg"))
            .ReturnsAsync(true);

        var service = CreateService(blobService);

        var result = await service.JobPhotoExistsAsync("7/job-photos/9/photo.jpg");

        Assert.True(result);
    }

    private static JobPhotoService CreateService(Mock<IAzureBlobStorageService>? blobService = null)
    {
        var settings = Options.Create(new StorageSettings
        {
            Containers = new StorageContainers
            {
                JobImages = "jobimages"
            }
        });

        return new JobPhotoService(
            (blobService ?? new Mock<IAzureBlobStorageService>()).Object,
            settings,
            Mock.Of<ILogger<JobPhotoService>>());
    }

    private static IFormFile CreateFormFile(string fileName, long? lengthOverride = null)
    {
        var dataLength = lengthOverride.HasValue
            ? (int)Math.Min(lengthOverride.Value, 1024)
            : 16;
        var bytes = Enumerable.Repeat((byte)65, dataLength).ToArray();
        var stream = new MemoryStream(bytes);

        return new FormFile(stream, 0, lengthOverride ?? bytes.Length, "file", fileName);
    }
}