using Microsoft.Extensions.Logging;
using mws.backend.dotnet.application.Common;
using mws.backend.dotnet.application.Documents;

namespace mws.backend.dotnet.infrastructure.CloudFile;

public class CloudFileDocumentContentStore(
    ICloudFileHttpClient cf,
    ILogger<CloudFileDocumentContentStore> log) : IDocumentContentStore
{
    private static string Bucket(Guid projectId) => $"mws-p-{projectId:N}";
    private static string Key(Guid documentId) => $"{documentId:N}.html";

    public Task EnsureBucketAsync(Guid projectId, CancellationToken ct) =>
        cf.EnsureBucketAsync(Bucket(projectId), ct);

    public async Task UploadAsync(Guid projectId, Guid documentId, string contentType, Stream body, CancellationToken ct)
    {
        try
        {
            var meta = await cf.UploadAsync(Bucket(projectId), Key(documentId), contentType, body, ct);
            log.LogDebug("Uploaded document {DocumentId} to cloudfile: {Hash}", documentId, meta?.ContentHash);
        }
        catch (HttpRequestException ex)
        {
            log.LogError(ex, "CloudFile upload failed for document {DocumentId}", documentId);
            throw new StorageUnavailableException("Cloud file upload failed", ex);
        }
    }

    public async Task<Stream> DownloadAsync(Guid projectId, Guid documentId, CancellationToken ct)
    {
        try
        {
            return await cf.DownloadAsync(Bucket(projectId), Key(documentId), ct);
        }
        catch (HttpRequestException ex)
        {
            log.LogError(ex, "CloudFile download failed for document {DocumentId}", documentId);
            throw new StorageUnavailableException("Cloud file download failed", ex);
        }
    }

    public async Task<bool> ExistsAsync(Guid projectId, Guid documentId, CancellationToken ct)
    {
        try
        {
            return await cf.ExistsAsync(Bucket(projectId), Key(documentId), ct);
        }
        catch (HttpRequestException)
        {
            return false;
        }
    }

    public async Task DeleteAsync(Guid projectId, Guid documentId, CancellationToken ct)
    {
        var bucket = Bucket(projectId);
        var key = Key(documentId);
        log.LogInformation("CloudFile delete: bucket={Bucket}, key={Key}", bucket, key);
        try
        {
            await cf.DeleteAsync(bucket, key, ct);
            log.LogInformation("CloudFile delete OK for document {DocumentId}", documentId);
        }
        catch (HttpRequestException ex)
        {
            log.LogWarning(ex, "CloudFile delete failed for document {DocumentId} (bucket={Bucket}, key={Key})", documentId, bucket, key);
        }
    }
}