package supply

// Valid checks only telemetry. Callers must degrade invalid observations without
// rejecting the business run or its archive.
func (s Snapshot) Valid() bool {
	if s.SchemaVersion != 1 || s.ResolutionMS != 1000 || s.Summary.Targets < 0 || s.Summary.Valid < 0 || s.Summary.Valid > s.Summary.Targets || s.Summary.Confirmed < 0 || s.Summary.Confirmed > s.Summary.Targets || s.Summary.Unknown < 0 || s.Summary.Unknown > s.Summary.Targets || s.Summary.TotalMS < 0 || s.Summary.LongestMS < 0 || s.Summary.UnknownMS < 0 || s.Summary.UnconfirmedMS < 0 || s.Summary.ConsumerMS < 0 {
		return false
	}
	seen := make(map[string]bool, len(s.Channels))
	for _, c := range s.Channels {
		if c.Key == "" || seen[c.Key] || c.ValidSamples < 0 || c.MissingSamples < 0 || c.UnknownMS < 0 {
			return false
		}
		seen[c.Key] = true
		for _, w := range []Wait{c.Startup, c.Confirmed, c.Unconfirmed, c.Consumer} {
			if w.Count < 0 || w.TotalMS < 0 || w.LongestMS < 0 || w.LongestMS > w.TotalMS {
				return false
			}
		}
		for _, v := range c.Stages {
			if v < 0 {
				return false
			}
		}
	}
	return len(s.Channels) <= s.Summary.Targets
}