package alerts

import (
	"git.tornberg.me/go-otel/internal/features"
	"git.tornberg.me/go-otel/internal/triage"
)

// TriageOf classifies a pattern's example event with the deterministic rules.
func TriageOf(e features.Event) triage.Result {
	return triage.Classify(triage.Input{Service: e.Service, Kind: e.Kind, Status: e.StatusCode, Route: e.Route, Title: e.SpanName, Message: e.Message,
		IsTimeout: e.IsTimeout, IsCancellation: e.IsCancellation, IsRetry: e.IsRetry})
}

// FilterActionable keeps only patterns whose category should page a human
// (unless keepMuted), recomputing each spike's excess so a probe storm cannot
// alert by itself. muted, when non-nil, counts what was dropped per category.
func FilterActionable(spikes []features.Spike, keepMuted bool, muted map[triage.Category]int) []features.Spike {
	var out []features.Spike
	for _, sp := range spikes {
		var kept []features.PatternDelta
		sp.Excess = 0
		for _, p := range sp.Patterns {
			c := TriageOf(p.Example).Category
			if !keepMuted && !c.Actionable() {
				if muted != nil {
					muted[c]++
				}
				continue
			}
			kept = append(kept, p)
			sp.Excess += p.Excess
		}
		if len(kept) > 0 {
			sp.Patterns = kept
			out = append(out, sp)
		}
	}
	return out
}