package handlers

import "net/http"

// newResolveEngineVersionImageRefHandler returns the handler for
// `GET /api/v1/internal/engine-versions/{version}/image-ref`. It is
// the hot-path Lobby calls before publishing a `runtime:start_jobs`
// envelope; the response carries only the image reference.
func newResolveEngineVersionImageRefHandler(deps Dependencies) http.HandlerFunc {
	logger := loggerFor(deps.Logger, "internal_rest.resolve_image_ref")
	return func(writer http.ResponseWriter, request *http.Request) {
		if deps.EngineVersions == nil {
			writeError(writer, http.StatusInternalServerError, errorCodeInternal, "engine version service is not wired")
			return
		}

		version, ok := extractVersion(writer, request)
		if !ok {
			return
		}

		imageRef, err := deps.EngineVersions.ResolveImageRef(request.Context(), version)
		if err != nil {
			logger.ErrorContext(request.Context(), "resolve image ref failed",
				"version", version,
				"err", err.Error(),
			)
			status, code, message := mapServiceError(err)
			writeError(writer, status, code, message)
			return
		}

		writeJSON(writer, http.StatusOK, imageRefResponse{ImageRef: imageRef})
	}
}