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

namespace StellaOps.Provcache.Api;

public static partial class ProvcacheEndpointExtensions
{
    /// <summary>
    /// GET /v1/provcache/{veriKey}/manifest
    /// </summary>
    private static async Task<IResult> GetInputManifestAsync(
        string veriKey,
        IProvcacheService provcacheService,
        TimeProvider timeProvider,
        ILogger<ProvcacheApiEndpoints> logger,
        CancellationToken cancellationToken)
    {
        logger.LogDebug("GET /v1/provcache/{VeriKey}/manifest", veriKey);

        try
        {
            // First get the entry to verify it exists
            var result = await provcacheService.GetAsync(veriKey, bypassCache: false, cancellationToken);

            if (result.Status == ProvcacheResultStatus.CacheMiss)
            {
                return Results.NotFound(new ProblemDetails
                {
                    Title = "Entry not found",
                    Detail = $"No cache entry found for VeriKey: {veriKey}",
                    Status = StatusCodes.Status404NotFound
                });
            }

            if (result.Status == ProvcacheResultStatus.Expired)
            {
                return Results.NotFound(new ProblemDetails
                {
                    Title = "Entry expired",
                    Detail = $"Cache entry for VeriKey '{veriKey}' has expired",
                    Status = StatusCodes.Status404NotFound
                });
            }

            var entry = result.Entry;
            if (entry is null)
            {
                return Results.NotFound(new ProblemDetails
                {
                    Title = "Entry not found",
                    Detail = $"No cache entry found for VeriKey: {veriKey}",
                    Status = StatusCodes.Status404NotFound
                });
            }

            // Build the input manifest from the entry metadata
            // In a full implementation, we'd resolve these hashes to more detailed metadata
            // from their respective stores (SBOM store, VEX store, policy registry, etc.)
            var manifest = BuildInputManifest(entry, timeProvider);

            return Results.Ok(manifest);
        }
        catch (Exception ex)
        {
            logger.LogError(ex, "Error getting input manifest for VeriKey {VeriKey}", veriKey);
            return InternalError("Manifest retrieval failed");
        }
    }
}