Add NPC interaction validators

internal/modules/dnd/validate/npcinteractions/registry/validator.go

@@ -0,0 +1,130 @@
+// Package registry validates D&D NPC interaction names against NPC grounding.
+package registry
+
+import (
+	"context"
+	"fmt"
+
+	"gitea.maximumdirect.net/eric/notarius/internal/framework/contracts"
+	"gitea.maximumdirect.net/eric/notarius/internal/framework/pipeline"
+	"gitea.maximumdirect.net/eric/notarius/internal/modules/dnd"
+	npcregistry "gitea.maximumdirect.net/eric/notarius/internal/modules/dnd/npcs/registry"
+	"gitea.maximumdirect.net/eric/notarius/internal/modules/dnd/shared/diagnostics"
+	interactionshape "gitea.maximumdirect.net/eric/notarius/internal/modules/dnd/validate/npcinteractions/shape"
+)
+
+const (
+	Key        = "extract/dnd/npc-interactions/registry"
+	ReasonCode = "invalid_npc_interaction_registry"
+	policy     = "dnd.npc_interactions.validator.registry.v1"
+)
+
+type Options struct{}
+
+type Validator struct {
+	npcResolver *npcregistry.Resolver
+}
+
+var _ contracts.TypedValidator[dnd.NPCInteractionList] = (*Validator)(nil)
+var _ contracts.ManifestMetadataProvider = (*Validator)(nil)
+var _ pipeline.CheckpointFingerprintProvider = (*Validator)(nil)
+
+func New(_ Options, references ...contracts.ReferenceSet) (*Validator, error) {
+	if len(references) > 1 {
+		return nil, fmt.Errorf("NPC interaction registry validator accepts at most one reference set")
+	}
+	var referenceSet contracts.ReferenceSet
+	if len(references) == 1 {
+		referenceSet = references[0]
+	}
+	resolver, err := npcregistry.NewResolver(referenceSet)
+	if err != nil {
+		return nil, fmt.Errorf("prepare NPC registry: %w", err)
+	}
+	return &Validator{npcResolver: resolver}, nil
+}
+
+func (v *Validator) Name() string { return Key }
+func (v *Validator) ExecutionClass() contracts.ExecutionClass {
+	return contracts.ExecutionClassDeterministic
+}
+
+func (v *Validator) ManifestMetadata() map[string]any {
+	if v == nil || v.npcResolver == nil {
+		return nil
+	}
+	metadata := map[string]any{"policy": policy}
+	seeded := v.npcResolver.Seeded()
+	if seeded.Bound() {
+		metadata["npc_registry_digest"] = seeded.Digest()
+		metadata["npc_count"] = seeded.Count()
+	}
+	return metadata
+}
+
+func (v *Validator) CheckpointFingerprints() []pipeline.CheckpointFingerprint {
+	if v == nil || v.npcResolver == nil {
+		return nil
+	}
+	return []pipeline.CheckpointFingerprint{
+		{Name: "policy", Value: policy},
+		{Name: "npc_registry", Value: v.npcResolver.Seeded().ProjectionDigest()},
+	}
+}
+
+func (v *Validator) Validate(_ context.Context, req contracts.TypedValidationRequest[dnd.NPCInteractionList]) (contracts.ValidationResult, error) {
+	if interactionshape.Validate(req.Value) != nil {
+		return contracts.ValidationResult{Approved: true}, nil
+	}
+	if v == nil || v.npcResolver == nil {
+		return contracts.ValidationResult{}, fmt.Errorf("NPC interaction registry validator must not be nil")
+	}
+	npcRegistry, err := v.npcResolver.Resolve(req.References)
+	if err != nil {
+		return contracts.ValidationResult{}, fmt.Errorf("resolve NPC registry: %w", err)
+	}
+	if !npcRegistry.Bound() {
+		return rejection([]string{"NPC registry reference is required"}), nil
+	}
+	issues := make([]string, 0)
+	for index, interaction := range req.Value.Interactions {
+		if _, ok := npcRegistry.Lookup(interaction.Name); !ok {
+			issues = append(issues, fmt.Sprintf("interactions[%d].name is not in the NPC registry: %s", index, diagnostics.Quote(interaction.Name)))
+		}
+	}
+	if len(issues) == 0 {
+		return contracts.ValidationResult{Approved: true}, nil
+	}
+	return rejection(issues), nil
+}
+
+func rejection(issues []string) contracts.ValidationResult {
+	return contracts.ValidationResult{
+		Approved:   false,
+		ReasonCode: ReasonCode,
+		Message:    diagnostics.Aggregate("invalid NPC interaction registry", issues),
+	}
+}
+
+func Spec() pipeline.ValidatorSpec {
+	return pipeline.ValidatorSpec{Key: Key, ExecutionClass: contracts.ExecutionClassDeterministic}
+}
+
+func Register(registry *pipeline.ValidatorRegistry) error {
+	return pipeline.RegisterTypedValidatorBuilder(registry, dnd.NPCInteractionListKind, Spec(), validateOptions, func(request pipeline.BuildRequest) (contracts.TypedValidator[dnd.NPCInteractionList], error) {
+		options, err := DecodeOptions(request.Options)
+		if err != nil {
+			return nil, err
+		}
+		return New(options, request.References)
+	})
+}
+
+func DecodeOptions(options map[string]any) (Options, error) {
+	if err := pipeline.RejectUnknownOptions(options); err != nil {
+		return Options{}, err
+	}
+	return Options{}, nil
+}
+
+func validateOptions(options map[string]any) error { _, err := DecodeOptions(options); return err }