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}/manifest
    /// </summary>
    private static async Task<IResult> GetProofManifestAsync(
        string proofRoot,
        [FromServices] IEvidenceChunkRepository chunkRepository,
        ILogger<ProofsApiEndpoints> logger,
        CancellationToken cancellationToken)
    {
        logger.LogDebug("GET /v1/provcache/proofs/{ProofRoot}/manifest", proofRoot);

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

            var chunkMetadata = manifest.Chunks
                .OrderBy(c => c.Index)
                .Select(c => new ChunkMetadataResponse
                {
                    ChunkId = c.ChunkId,
                    Index = c.Index,
                    Hash = c.Hash,
                    Size = c.Size,
                    ContentType = c.ContentType
                }).ToList();

            return Results.Ok(new ProofManifestResponse
            {
                ProofRoot = proofRoot,
                TotalChunks = manifest.TotalChunks,
                TotalSize = manifest.TotalSize,
                Chunks = chunkMetadata,
                GeneratedAt = manifest.GeneratedAt
            });
        }
        catch (Exception ex)
        {
            logger.LogError(ex, "Error getting manifest for proof root {ProofRoot}", proofRoot);
            return InternalError("Manifest retrieval failed");
        }
    }
}