290 lines
10 KiB
Go
290 lines
10 KiB
Go
// Package npcoccurrences normalizes merged D&D NPC occurrence candidates.
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package npcoccurrences
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import (
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"context"
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"fmt"
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"sort"
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"gitea.maximumdirect.net/eric/notarius/internal/core/source"
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"gitea.maximumdirect.net/eric/notarius/internal/framework/contracts"
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"gitea.maximumdirect.net/eric/notarius/internal/framework/pipeline"
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"gitea.maximumdirect.net/eric/notarius/internal/modules/dnd"
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occurrencemodel "gitea.maximumdirect.net/eric/notarius/internal/modules/dnd/npcoccurrences"
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npcregistry "gitea.maximumdirect.net/eric/notarius/internal/modules/dnd/npcs/registry"
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"gitea.maximumdirect.net/eric/notarius/internal/modules/dnd/shared"
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"gitea.maximumdirect.net/eric/notarius/internal/modules/dnd/shared/diagnostics"
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)
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const (
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Key = "dnd/npc-occurrences"
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normalizationPolicy = "dnd.npc_occurrences.normalize.v2"
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NormalizationPolicy = normalizationPolicy
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ReasonCodeSourceRefsNormalized = "source_references_normalized"
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ReasonCodeOccurrencesReordered = "npc_occurrences_reordered"
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ReasonCodeDuplicateCollapsed = "duplicate_npc_occurrence_collapsed"
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ReasonCodeWarningsOmitted = "npc_occurrence_normalization_warnings_omitted"
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)
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const (
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NPCRegistryReferenceSlot = npcregistry.ReferenceSlot
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NPCRegistryMaxBytes = npcregistry.MaxBytes
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)
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var requiredCapabilities = []string{"merged"}
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var providedCapabilities = []string{"normalized"}
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var _ contracts.Normalizer[dnd.NPCOccurrenceList] = (*Normalizer)(nil)
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var _ contracts.ManifestMetadataProvider = (*Normalizer)(nil)
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var _ pipeline.CheckpointFingerprintProvider = (*Normalizer)(nil)
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type Options struct{}
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type Normalizer struct {
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npcResolver *npcregistry.Resolver
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}
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func New(_ Options, references ...contracts.ReferenceSet) (*Normalizer, error) {
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if len(references) > 1 {
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return nil, normalizerErrorf("at most one reference set may be supplied")
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}
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var referenceSet contracts.ReferenceSet
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if len(references) == 1 {
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referenceSet = references[0]
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}
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resolver, err := npcregistry.NewResolver(referenceSet)
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if err != nil {
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return nil, normalizerErrorf("prepare NPC registry: %w", err)
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}
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return &Normalizer{npcResolver: resolver}, nil
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}
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func (n *Normalizer) Key() string { return Key }
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func (n *Normalizer) ReferenceSlots() []contracts.ReferenceSlot { return referenceSlots() }
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func (n *Normalizer) ManifestMetadata() map[string]any {
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if n == nil || n.npcResolver == nil {
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return nil
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}
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metadata := map[string]any{
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"normalization_policy": normalizationPolicy,
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}
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seeded := n.npcResolver.Seeded()
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if seeded.Bound() {
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metadata["npc_registry_digest"] = seeded.Digest()
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metadata["npc_count"] = seeded.Count()
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}
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return metadata
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}
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func (n *Normalizer) CheckpointFingerprints() []pipeline.CheckpointFingerprint {
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if n == nil || n.npcResolver == nil {
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return nil
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}
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return []pipeline.CheckpointFingerprint{
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{Name: "normalization_policy", Value: normalizationPolicy},
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{Name: "npc_registry", Value: n.npcResolver.Seeded().IdentityDigest()},
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}
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}
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func (n *Normalizer) Normalize(ctx context.Context, req contracts.TypedNormalizeRequest[dnd.NPCOccurrenceList]) (contracts.TypedNormalizeResult[dnd.NPCOccurrenceList], error) {
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if n == nil || n.npcResolver == nil {
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return contracts.TypedNormalizeResult[dnd.NPCOccurrenceList]{}, normalizerErrorf("normalizer must not be nil")
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}
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if ctx == nil {
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return contracts.TypedNormalizeResult[dnd.NPCOccurrenceList]{}, normalizerErrorf("context must not be nil")
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}
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if err := ctx.Err(); err != nil {
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return contracts.TypedNormalizeResult[dnd.NPCOccurrenceList]{}, normalizerErrorf("context error before normalize: %w", err)
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}
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registry, err := n.npcResolver.Resolve(req.References)
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if err != nil {
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return contracts.TypedNormalizeResult[dnd.NPCOccurrenceList]{}, normalizerErrorf("resolve NPC registry: %w", err)
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}
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if !registry.Bound() {
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return contracts.TypedNormalizeResult[dnd.NPCOccurrenceList]{}, normalizerErrorf("NPC registry reference is required")
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}
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index := source.NewDocumentIndex(req.Source)
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order := shared.NewSourceRefOrderFromIndex(index)
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value, warnings, err := normalizeList(req.MergeOutput.Value, index, order, registry)
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if err != nil {
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return contracts.TypedNormalizeResult[dnd.NPCOccurrenceList]{}, normalizerErrorf("validate NPC registry pairs: %w", err)
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}
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return contracts.TypedNormalizeResult[dnd.NPCOccurrenceList]{Value: value, Warnings: warnings}, nil
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}
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type normalizedRecord struct {
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occurrence dnd.NPCOccurrence
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inputIndex int
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}
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func normalizeList(input dnd.NPCOccurrenceList, documentIndex source.DocumentIndex, order shared.SourceRefOrder, registry *npcregistry.Registry) (dnd.NPCOccurrenceList, []contracts.Warning, error) {
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if input.Occurrences == nil {
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return dnd.NPCOccurrenceList{}, nil, nil
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}
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records := make([]normalizedRecord, len(input.Occurrences))
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warnings := make([]contracts.Warning, 0)
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for index, inputOccurrence := range input.Occurrences {
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occurrence, refsChanged, err := normalizeOccurrence(inputOccurrence, order, registry)
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if err != nil {
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return dnd.NPCOccurrenceList{}, nil, fmt.Errorf("occurrences[%d]: %w", index, err)
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}
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records[index] = normalizedRecord{occurrence: occurrence, inputIndex: index}
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if refsChanged {
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warnings = append(warnings, contracts.Warning{
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Scope: occurrenceScope(index),
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ReasonCode: ReasonCodeSourceRefsNormalized,
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Message: fmt.Sprintf("input index %d: source references normalized (original count %d, final count %d)",
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index, len(inputOccurrence.SourceRefs), len(occurrence.SourceRefs)),
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})
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}
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}
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sort.SliceStable(records, func(left, right int) bool {
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return occurrencemodel.Less(order, records[left].occurrence, records[right].occurrence)
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})
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for position, record := range records {
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if position == record.inputIndex {
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continue
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}
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warnings = append(warnings, contracts.Warning{
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Scope: occurrenceScope(record.inputIndex),
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ReasonCode: ReasonCodeOccurrencesReordered,
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Message: fmt.Sprintf("input index %d moved to normalized position %d by source chronology", record.inputIndex, position),
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})
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}
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output, duplicateWarnings := collapseDuplicates(records, documentIndex)
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warnings = append(warnings, duplicateWarnings...)
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return dnd.NPCOccurrenceList{Occurrences: output},
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diagnostics.LimitWarnings(warnings, "npc_occurrences", ReasonCodeWarningsOmitted), nil
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}
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func normalizeOccurrence(input dnd.NPCOccurrence, order shared.SourceRefOrder, registry *npcregistry.Registry) (dnd.NPCOccurrence, bool, error) {
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canonical, ok := registry.LookupID(input.NPCID)
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if !ok {
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return dnd.NPCOccurrence{}, false, fmt.Errorf("npc_id is not in the NPC registry")
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}
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if input.Name != canonical.Name {
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return dnd.NPCOccurrence{}, false, fmt.Errorf("name does not match npc_id")
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}
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output := cloneOccurrence(input)
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output.SourceRefs = order.Canonicalize(input.SourceRefs)
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return output, !occurrencemodel.SourceRefsEqual(input.SourceRefs, output.SourceRefs), nil
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}
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func cloneOccurrence(input dnd.NPCOccurrence) dnd.NPCOccurrence {
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output := input
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if input.SourceRefs != nil {
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output.SourceRefs = append([]source.SourceRef(nil), input.SourceRefs...)
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}
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return output
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}
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type duplicateGroup struct {
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retainedIndex int
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removed []int
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}
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func collapseDuplicates(records []normalizedRecord, documentIndex source.DocumentIndex) ([]dnd.NPCOccurrence, []contracts.Warning) {
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if len(records) == 0 {
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return make([]dnd.NPCOccurrence, 0), nil
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}
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keep := make([]bool, len(records))
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groups := make([]duplicateGroup, 0)
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groupByKey := make(map[string]int)
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for index, record := range records {
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if !occurrencemodel.ValidSourceRefs(documentIndex, record.occurrence.SourceRefs) {
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keep[index] = true
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continue
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}
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key := occurrencemodel.ExactIdentity(record.occurrence)
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groupIndex, exists := groupByKey[key]
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if !exists {
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groupByKey[key] = len(groups)
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groups = append(groups, duplicateGroup{retainedIndex: record.inputIndex})
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keep[index] = true
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continue
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}
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groups[groupIndex].removed = append(groups[groupIndex].removed, record.inputIndex)
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}
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output := make([]dnd.NPCOccurrence, 0, len(records))
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for index, record := range records {
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if keep[index] {
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output = append(output, cloneOccurrence(record.occurrence))
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}
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}
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warnings := make([]contracts.Warning, 0)
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for _, group := range groups {
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if len(group.removed) != 0 {
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warnings = append(warnings, duplicateWarning(group.retainedIndex, group.removed))
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}
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}
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return output, warnings
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}
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func duplicateWarning(retainedIndex int, removed []int) contracts.Warning {
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issues := make([]string, len(removed))
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for index, removedIndex := range removed {
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issues[index] = fmt.Sprintf("removed input index %d", removedIndex)
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}
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return contracts.Warning{
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Scope: occurrenceScope(retainedIndex),
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ReasonCode: ReasonCodeDuplicateCollapsed,
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Message: diagnostics.Aggregate(
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fmt.Sprintf("duplicate NPC occurrence collapsed; retained input index %d", retainedIndex), issues),
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}
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}
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func occurrenceScope(index int) string { return fmt.Sprintf("occurrences[%d]", index) }
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func referenceSlots() []contracts.ReferenceSlot {
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return []contracts.ReferenceSlot{{
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Name: NPCRegistryReferenceSlot,
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Description: "Required normalized NPC registry used only for occurrence identity grounding, never as occurrence evidence.",
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Required: true,
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AcceptedMediaTypes: []string{"application/json"},
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AcceptedArtifactKinds: []contracts.ArtifactKind{dnd.NPCRegistryKind},
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MaxBytes: NPCRegistryMaxBytes,
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}}
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}
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func ModuleSpec() pipeline.ModuleSpec {
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return pipeline.ModuleSpec{
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Key: Key,
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Stage: pipeline.StageNormalize,
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ExecutionClass: contracts.ExecutionClassDeterministic,
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Requires: append([]string(nil), requiredCapabilities...),
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Provides: append([]string(nil), providedCapabilities...),
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ArtifactKind: dnd.NPCOccurrenceListKind,
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ReferenceSlots: referenceSlots(),
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}
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}
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func Register(registry *pipeline.NormalizerRegistry) error {
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return pipeline.RegisterNormalizerBuilder(registry, ModuleSpec(), validateOptions, func(request pipeline.BuildRequest) (contracts.Normalizer[dnd.NPCOccurrenceList], error) {
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options, err := DecodeOptions(request.Options)
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if err != nil {
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return nil, err
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}
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return New(options, request.References)
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})
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}
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func DecodeOptions(options map[string]any) (Options, error) {
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if err := pipeline.RejectUnknownOptions(options); err != nil {
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return Options{}, normalizerErrorf("%w", err)
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}
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return Options{}, nil
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}
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func validateOptions(options map[string]any) error { _, err := DecodeOptions(options); return err }
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func normalizerErrorf(format string, args ...any) error {
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return fmt.Errorf("dnd NPC occurrences normalizer: "+format, args...)
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}
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