package forage

// SourceRecord remembers a URL that the organism fetched.
// Bond ratio indicates how useful the content was.
type SourceRecord struct {
	URL       string  `json:"url"`
	BondRatio float64 `json:"bond_ratio"` // fraction of elements that bonded
	Gen       int     `json:"gen"`         // generation when fetched
	Hash      string  `json:"hash"`        // SHA-256 of content
}

// FilterUsefulSources returns sources with bond ratio above threshold.
// These are URLs that produced content the lattice could absorb.
func FilterUsefulSources(records []SourceRecord, minRatio float64) []SourceRecord {
	var useful []SourceRecord
	for _, r := range records {
		if r.BondRatio >= minRatio {
			useful = append(useful, r)
		}
	}
	return useful
}