package version

import (
	"io"
	"net/http"
	"runtime/debug"

	"go.uber.org/fx"

	// import embedded version
	"payouts/internal/version"
)

// Route version route
const Route = "/version"

// Module is a fx module
var Module = fx.Options(
	fx.Provide(New),
)

// New constructs a new config Handler.
func New() (Handler, error) {

	return &handler{
		version.Version,
	}, nil
}

// Handler config handler interface
type Handler interface {
	VersionHandler(http.ResponseWriter, *http.Request)
}

type handler struct {
	version string
}

// VersionHandler handles the version requests
func (h *handler) VersionHandler(w http.ResponseWriter, r *http.Request) {
	defer r.Body.Close()

	ver := h.version
	if ver == "unknown" {
		buildInfo, ok := debug.ReadBuildInfo()
		if ok {
			for _, setting := range buildInfo.Settings {
				if setting.Key == "vcs.revision" {
					ver = ver + "-" + setting.Value
					break
				}
			}
		}
	}

	w.Header().Set("Content-Type", "text/plain")
	w.WriteHeader(http.StatusOK)
	io.WriteString(w, ver+"\n")
}