Add D&D enemy event extractor

internal/modules/dnd/extract/enemyevents/mapping.go

@@ -0,0 +1,60 @@
+package enemyevents
+
+import (
+	"sort"
+
+	"gitea.maximumdirect.net/eric/notarius/internal/core/source"
+	"gitea.maximumdirect.net/eric/notarius/internal/modules/dnd"
+	"gitea.maximumdirect.net/eric/notarius/internal/modules/dnd/shared"
+)
+
+type orderedEnemyEvent struct {
+	value       dnd.EnemyEvent
+	earliest    int
+	hasEvidence bool
+}
+
+func canonicalEnemyEventList(response extractionResponse, order shared.SourceRefOrder, sourceID string) dnd.EnemyEventList {
+	if response.Events == nil {
+		return dnd.EnemyEventList{}
+	}
+	ordered := make([]orderedEnemyEvent, len(response.Events))
+	for index, event := range response.Events {
+		refs := order.Canonicalize(sourceRefs(event.SourceRefs, sourceID))
+		earliest, hasEvidence := order.EarliestValid(refs)
+		ordered[index] = orderedEnemyEvent{
+			value: dnd.EnemyEvent{
+				Name:       event.Name,
+				Kind:       dnd.EnemyEventKind(event.Kind),
+				SourceRefs: refs,
+			},
+			earliest:    earliest,
+			hasEvidence: hasEvidence,
+		}
+	}
+	sort.SliceStable(ordered, func(left, right int) bool {
+		if ordered[left].hasEvidence != ordered[right].hasEvidence {
+			return ordered[left].hasEvidence
+		}
+		if !ordered[left].hasEvidence {
+			return false
+		}
+		return ordered[left].earliest < ordered[right].earliest
+	})
+	events := make([]dnd.EnemyEvent, len(ordered))
+	for index := range ordered {
+		events[index] = ordered[index].value
+	}
+	return dnd.EnemyEventList{Events: events}
+}
+
+func sourceRefs(refs []enemySourceRefResponse, sourceID string) []source.SourceRef {
+	if refs == nil {
+		return nil
+	}
+	values := make([]source.SourceRef, len(refs))
+	for index, ref := range refs {
+		values[index] = source.SourceRef{SourceID: sourceID, StartUnitID: ref.StartUnitID, EndUnitID: ref.EndUnitID}
+	}
+	return values
+}