using System.Net;
using System.Net.Http;
using Microsoft.Extensions.Logging;
using Moq;
using mws.backend.dotnet.infrastructure.CloudFile;

namespace tests;

public class CloudFileDocumentContentStoreTests
{
    private readonly Mock<ICloudFileHttpClient> _cfMock = new();
    private readonly Mock<ILogger<CloudFileDocumentContentStore>> _loggerMock = new();
    private readonly CloudFileDocumentContentStore _sut;

    public CloudFileDocumentContentStoreTests()
    {
        _sut = new CloudFileDocumentContentStore(_cfMock.Object, _loggerMock.Object);
    }

    [Fact]
    public async Task EnsureBucketAsync_CallsCorrectBucket()
    {
        var projectId = Guid.NewGuid();

        await _sut.EnsureBucketAsync(projectId, CancellationToken.None);

        _cfMock.Verify(c => c.EnsureBucketAsync($"mws-p-{projectId:N}", It.IsAny<CancellationToken>()), Times.Once);
    }

    [Fact]
    public async Task UploadAsync_BuildsCorrectBucketAndKey()
    {
        var projectId = Guid.NewGuid();
        var documentId = Guid.NewGuid();
        using var stream = new MemoryStream(new byte[] { 1, 2, 3 });

        await _sut.UploadAsync(projectId, documentId, "text/html; charset=utf-8", stream, CancellationToken.None);

        _cfMock.Verify(c => c.UploadAsync(
            $"mws-p-{projectId:N}",
            $"{documentId:N}.html",
            "text/html; charset=utf-8",
            It.IsAny<Stream>(),
            It.IsAny<CancellationToken>()), Times.Once);
    }

    [Fact]
    public async Task UploadAsync_ThrowsStorageUnavailableOnHttpRequestException()
    {
        var projectId = Guid.NewGuid();
        var documentId = Guid.NewGuid();
        using var stream = new MemoryStream(new byte[] { 1, 2, 3 });

        _cfMock.Setup(c => c.UploadAsync(
                It.IsAny<string>(), It.IsAny<string>(), It.IsAny<string>(),
                It.IsAny<Stream>(), It.IsAny<CancellationToken>()))
            .ThrowsAsync(new HttpRequestException("Connection refused"));

        var ex = await Assert.ThrowsAsync<mws.backend.dotnet.application.Common.StorageUnavailableException>(
            () => _sut.UploadAsync(projectId, documentId, "text/html", stream, CancellationToken.None));

        Assert.Contains("Cloud file upload failed", ex.Message);
    }

    [Fact]
    public async Task DownloadAsync_ReturnsStreamNullOnNotFound()
    {
        var projectId = Guid.NewGuid();
        var documentId = Guid.NewGuid();

        _cfMock.Setup(c => c.DownloadAsync(It.IsAny<string>(), It.IsAny<string>(), It.IsAny<CancellationToken>()))
            .ReturnsAsync(Stream.Null);

        var result = await _sut.DownloadAsync(projectId, documentId, CancellationToken.None);

        Assert.Equal(Stream.Null, result);
    }

    [Fact]
    public async Task DownloadAsync_ThrowsStorageUnavailableOnHttpRequestException()
    {
        var projectId = Guid.NewGuid();
        var documentId = Guid.NewGuid();

        _cfMock.Setup(c => c.DownloadAsync(It.IsAny<string>(), It.IsAny<string>(), It.IsAny<CancellationToken>()))
            .ThrowsAsync(new HttpRequestException("Connection refused"));

        await Assert.ThrowsAsync<mws.backend.dotnet.application.Common.StorageUnavailableException>(
            () => _sut.DownloadAsync(projectId, documentId, CancellationToken.None));
    }

    [Fact]
    public async Task DeleteAsync_Swallows404Errors()
    {
        var projectId = Guid.NewGuid();
        var documentId = Guid.NewGuid();

        // Should not throw
        await _sut.DeleteAsync(projectId, documentId, CancellationToken.None);

        _cfMock.Verify(c => c.DeleteAsync(
            $"mws-p-{projectId:N}",
            $"{documentId:N}.html",
            It.IsAny<CancellationToken>()), Times.Once);
    }

    [Fact]
    public async Task ExistsAsync_ReturnsTrueWhenFileExists()
    {
        var projectId = Guid.NewGuid();
        var documentId = Guid.NewGuid();

        _cfMock.Setup(c => c.ExistsAsync(It.IsAny<string>(), It.IsAny<string>(), It.IsAny<CancellationToken>()))
            .ReturnsAsync(true);

        var result = await _sut.ExistsAsync(projectId, documentId, CancellationToken.None);

        Assert.True(result);
    }

    [Fact]
    public async Task ExistsAsync_ReturnsFalseOnException()
    {
        var projectId = Guid.NewGuid();
        var documentId = Guid.NewGuid();

        _cfMock.Setup(c => c.ExistsAsync(It.IsAny<string>(), It.IsAny<string>(), It.IsAny<CancellationToken>()))
            .ThrowsAsync(new HttpRequestException("Connection refused"));

        var result = await _sut.ExistsAsync(projectId, documentId, CancellationToken.None);

        Assert.False(result);
    }
}