using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Logging;

namespace StellaOps.Provcache.Api;

public static partial class ProvcacheEndpointExtensions
{
    /// <summary>
    /// GET /v1/provcache/proofs/{proofRoot}/chunks/{chunkIndex}
    /// </summary>
    private static async Task<IResult> GetSingleChunkAsync(
        string proofRoot,
        int chunkIndex,
        [FromServices] IEvidenceChunkRepository chunkRepository,
        ILogger<ProofsApiEndpoints> logger,
        CancellationToken cancellationToken)
    {
        logger.LogDebug("GET /v1/provcache/proofs/{ProofRoot}/chunks/{ChunkIndex}", proofRoot, chunkIndex);

        try
        {
            var chunk = await chunkRepository.GetChunkAsync(proofRoot, chunkIndex, cancellationToken);
            if (chunk is null)
            {
                return Results.NotFound();
            }

            return Results.Ok(new ProofChunkResponse
            {
                ChunkId = chunk.ChunkId,
                Index = chunk.ChunkIndex,
                Hash = chunk.ChunkHash,
                Size = chunk.BlobSize,
                ContentType = chunk.ContentType,
                Data = Convert.ToBase64String(chunk.Blob)
            });
        }
        catch (Exception ex)
        {
            logger.LogError(ex, "Error getting chunk {ChunkIndex} for proof root {ProofRoot}", chunkIndex, proofRoot);
            return InternalError("Chunk retrieval failed");
        }
    }
}