package cli

import (
	"time"

	"sneak.berlin/go/mfer/mfer"
)

// mtimeAbsent is printed in place of a modification time when a manifest
// entry does not carry one.
const mtimeAbsent = "-"

// entryMtime returns the modification time recorded for a manifest entry.
//
// MFFilePath.Mtime is a message pointer with proto3 field presence, so an
// absent mtime is a representable, on-the-wire-valid state. It must never
// be conflated with a recorded mtime of the Unix epoch: callers that
// compare mtimes have to treat "absent" as "unknown", not as
// 1970-01-01T00:00:00Z, or every entry compares as modified. ok reports
// whether an mtime was actually recorded.
func entryMtime(entry *mfer.MFFilePath) (time.Time, bool) {
	ts := entry.GetMtime()
	if ts == nil {
		return time.Time{}, false
	}

	return time.Unix(ts.GetSeconds(), int64(ts.GetNanos())), true
}