// Copyright (c) 2026 Storm Dragon
// Authors: Storm Dragon, Angus Kola
// SPDX-License-Identifier: GPL-3.0-or-later

package version

import (
	"runtime"
	"runtime/debug"
)

// Identity describes the executable itself, without consulting a checkout that
// may have changed since it was built. Missing VCS stamps remain explicit.
type Identity struct {
	GoVersion string `json:"go_version"`
	Revision  string `json:"vcs_revision"`
	Time      string `json:"vcs_time"`
	Modified  string `json:"vcs_modified"`
}

func RuntimeIdentity() Identity {
	info, _ := debug.ReadBuildInfo()
	return build_identity(info)
}

func build_identity(info *debug.BuildInfo) Identity {
	identity := Identity{GoVersion: runtime.Version(), Revision: "unknown", Time: "unknown", Modified: "unknown"}
	if info == nil {
		return identity
	}
	identity.GoVersion = info.GoVersion
	for _, setting := range info.Settings {
		switch setting.Key {
		case "vcs.revision":
			identity.Revision = setting.Value
		case "vcs.time":
			identity.Time = setting.Value
		case "vcs.modified":
			identity.Modified = setting.Value
		}
	}
	return identity
}