package integration_test

import (
	"context"
	"crypto/sha256"
	"encoding/json"
	"fmt"
	"os"
	"path/filepath"
	"reflect"
	"strings"
	"sync"
	"testing"

	"gitea.maximumdirect.net/eric/notarius/internal/core/config"
	"gitea.maximumdirect.net/eric/notarius/internal/core/source"
	"gitea.maximumdirect.net/eric/notarius/internal/framework/contracts"
	"gitea.maximumdirect.net/eric/notarius/internal/framework/evidencecontext"
	"gitea.maximumdirect.net/eric/notarius/internal/framework/pipeline"
	"gitea.maximumdirect.net/eric/notarius/internal/framework/semanticreconcile"
	"gitea.maximumdirect.net/eric/notarius/internal/modules/dnd"
	combatcodec "gitea.maximumdirect.net/eric/notarius/internal/modules/dnd/codec/combatturns"
	npccodec "gitea.maximumdirect.net/eric/notarius/internal/modules/dnd/codec/npcregistry"
	scenecodec "gitea.maximumdirect.net/eric/notarius/internal/modules/dnd/codec/scenedescriptions"
	spellcodec "gitea.maximumdirect.net/eric/notarius/internal/modules/dnd/codec/spells"
	combatextract "gitea.maximumdirect.net/eric/notarius/internal/modules/dnd/extract/combatturns"
	"gitea.maximumdirect.net/eric/notarius/internal/modules/dnd/extract/npcregistry"
	sceneextract "gitea.maximumdirect.net/eric/notarius/internal/modules/dnd/extract/scenedescriptions"
	"gitea.maximumdirect.net/eric/notarius/internal/modules/dnd/extract/spells"
	npcnormalize "gitea.maximumdirect.net/eric/notarius/internal/modules/dnd/normalize/npcregistry"
)

func TestNPCOutputGroundsSpellAndCombatConsumersThroughOneOperation(t *testing.T) {
	registries := productionNPCRegistries(t)
	catalog := moduleCatalog(registries)
	configValue := loadGroundedPipelineConfig(t)
	campaignInputs := configureGroundedCampaignReferences(t, &configValue)
	effective, err := configValue.Resolve(config.ResolveInput{PipelineID: "dnd-npc-grounded", Catalog: catalog})
	if err != nil {
		t.Fatalf("Resolve() error = %v", err)
	}
	materialized, warnings, err := pipeline.MaterializeReferences(effective.ResolvedPipeline, catalog, pipeline.ReferenceMaterializationOptions{})
	if err != nil || len(warnings) != 0 {
		t.Fatalf("MaterializeReferences() error = %v warnings = %#v", err, warnings)
	}

	client := &groundedDNDLLMClient{}
	prepared, err := pipeline.Prepare(materialized, registries, pipeline.ModuleDependencies{LLM: client})
	if err != nil {
		t.Fatalf("Prepare() error = %v", err)
	}
	for name, value := range map[string]string{
		"extract:npc_registry:dnd/npc-registry:mapping_policy":                   "dnd.npc_registry.extract_mapping.v2",
		"normalize:npc_registry:dnd/npc-registry:identity_policy":                "dnd.npc_registry.identity.v1",
		"normalize:npc_registry:dnd/npc-registry:normalization_policy":           npcnormalize.NormalizationPolicy,
		"normalize:npc_registry:dnd/npc-registry:semantic_reconciliation_policy": semanticreconcile.Policy,
		"extract:spells:dnd/spells:mapping_policy":                               "dnd.spells.extract_mapping.v2",
		"extract:combat:dnd/combat-turns:scene_gate_policy":                      "dnd.combat_turns.scene_gate.v1",
	} {
		assertFingerprintValue(t, prepared.CheckpointFingerprints(), name, value)
	}
	for _, name := range []string{
		"extract:npc_registry:dnd/npc-registry:prompt",
		"extract:npc_registry:dnd/npc-registry:response_schema",
		"normalize:npc_registry:dnd/npc-registry:prompt",
		"normalize:npc_registry:dnd/npc-registry:response_schema",
		"normalize:npc_registry:dnd/npc-registry:semantic_reconciliation_limits",
		"extract:spells:dnd/spells:prompt",
		"extract:spells:dnd/spells:response_schema",
		"extract:spells:dnd/spells:npc_registry",
		"extract:combat:dnd/combat-turns:prompt",
		"extract:combat:dnd/combat-turns:response_schema",
		"extract:combat:dnd/combat-turns:scene_eligibility",
		"extract:combat:dnd/combat-turns:npc_registry",
		"normalize:combat:dnd/combat-turns:npc_registry",
	} {
		assertCombatFingerprint(t, prepared.CheckpointFingerprints(), name)
	}
	checkpoint := newGeneratedReferenceCheckpointLoader()
	output, err := pipeline.New().Run(context.Background(), pipeline.RunInput{
		Prepared:       prepared,
		RawInput:       readNPCFixture(t),
		ExtractWorkers: 1,
		Checkpoint:     checkpoint,
	})
	if err != nil {
		t.Fatalf("Run() error = %v", err)
	}
	if len(output.Rejected) != 0 || len(output.NormalizeOutputs) != 4 {
		t.Fatalf("run outputs = %#v rejected = %#v, want NPC, scene, spell, and combat outputs", output.NormalizeOutputs, output.Rejected)
	}
	wantSchemas := map[string]string{"npc_registry": npccodec.SchemaID, "scene-descriptions": scenecodec.SchemaID, "spells": spellcodec.SchemaID, "combat": combatcodec.SchemaID}
	for _, serialized := range output.NormalizeOutputs {
		if serialized.Artifact.Schema.ID != wantSchemas[serialized.LaneID] || serialized.Artifact.Schema.Version != "v1" {
			t.Fatalf("%s artifact schema = %#v, want minimal v1 identity", serialized.LaneID, serialized.Artifact.Schema)
		}
	}
	wantExtractorIdentity := map[string]struct{ promptID, schemaID string }{
		"npc_registry":       {npcregistry.PromptID, npcregistry.ResponseSchemaID},
		"scene-descriptions": {sceneextract.PromptID, sceneextract.ResponseSchemaID},
		"spells":             {spells.PromptID, spells.ResponseSchemaID},
		"combat":             {combatextract.PromptID, combatextract.ResponseSchemaID},
	}
	for _, lane := range output.Manifest.ArtifactLanes {
		want, ok := wantExtractorIdentity[lane.ID]
		metadata, metadataOK := lane.Metadata["extractor"].(map[string]any)
		if !ok || !metadataOK || metadata["prompt_id"] != want.promptID || metadata["prompt_version"] != "v1" || metadata["response_schema_id"] != want.schemaID || metadata["response_schema_version"] != "v1" {
			t.Fatalf("%s extractor metadata = %#v, want v1 prompt/schema identity", lane.ID, metadata)
		}
	}

	var npcPayload, scenePayload []byte
	seenSteps := map[string]string{}
	for _, serialized := range output.NormalizeOutputs {
		seenSteps[serialized.LaneID] = serialized.StepID
		switch serialized.LaneID {
		case "npc_registry":
			npcPayload = append([]byte(nil), serialized.Artifact.Content...)
		case "scene-descriptions":
			scenePayload = append([]byte(nil), serialized.Artifact.Content...)
		}
	}
	if seenSteps["npc_registry"] != "identify-npcs" || seenSteps["scene-descriptions"] != "identify-npcs" || seenSteps["spells"] != "grounded-events" || seenSteps["combat"] != "grounded-events" {
		t.Fatalf("normalized output steps = %#v, want ordered producer and consumer steps", seenSteps)
	}
	if len(npcPayload) == 0 {
		t.Fatal("NPC producer did not publish a canonical payload")
	}
	if len(scenePayload) == 0 {
		t.Fatal("scene producer did not publish a canonical payload")
	}
	npcValue, err := npccodec.New().Decode(npcPayload)
	if err != nil {
		t.Fatalf("decode NPC producer payload: %v", err)
	}
	npcPayload, err = npccodec.New().Encode(npcValue)
	if err != nil {
		t.Fatalf("encode canonical NPC producer payload: %v", err)
	}
	canonicalDigest := digestBytes(npcPayload)
	sceneValue, err := scenecodec.New().Decode(scenePayload)
	if err != nil {
		t.Fatalf("decode scene producer payload: %v", err)
	}
	scenePayload, err = scenecodec.New().Encode(sceneValue)
	if err != nil {
		t.Fatalf("encode canonical scene producer payload: %v", err)
	}
	sceneDigest := digestBytes(scenePayload)
	projection := []byte(`{"npcs":[{"name":"Mira Thorn"},{"name":"Hooded Guard"}]}`)
	projectionDigest := digestBytes(projection)
	seenConsumers := map[string]bool{}
	for _, request := range client.requestsSnapshot() {
		if request.PromptID != spells.PromptID && request.PromptID != combatextract.PromptID {
			continue
		}
		input := request.Inputs["npc_registry"]
		if input.MediaType != npccodec.MediaType || input.Digest != projectionDigest || string(input.Content) != string(projection) || input.OriginURI != "" {
			t.Fatalf("%s NPC prompt input = %#v, want names-only generated registry", request.PromptID, input)
		}
		if request.PromptID == combatextract.PromptID {
			transcript, ok := request.Inputs["transcript"]
			if !ok || !strings.Contains(string(transcript.Content), "Mira Thorn asks the party") {
				t.Fatalf("combat transcript input = %#v, want configured transcript content", transcript)
			}
			for name, want := range campaignInputs {
				input, ok := request.Inputs[name]
				if !ok || string(input.Content) != want {
					t.Fatalf("combat %s input = %#v, want configured campaign reference", name, input)
				}
			}
			if _, ok := request.Inputs["scene_descriptions"]; ok {
				t.Fatalf("combat prompt inputs = %#v, must not contain scene descriptions", request.Inputs)
			}
		}
		seenConsumers[request.PromptID] = true
	}
	if !seenConsumers[spells.PromptID] || !seenConsumers[combatextract.PromptID] {
		t.Fatalf("consumer prompt IDs = %#v, want spell and combat requests", seenConsumers)
	}
	if combatCompletionCount(client.requestsSnapshot()) != 1 {
		t.Fatalf("combat completion requests = %#v, want exactly one for the exact combat scene", client.requestsSnapshot())
	}

	provenanceCount := 0
	for _, reference := range output.Manifest.References {
		if reference.SlotName != "npc_registry" {
			continue
		}
		provenanceCount++
		if reference.Digest != canonicalDigest || reference.OriginType != "generated" {
			t.Fatalf("NPC generated provenance = %#v, want canonical digest and generated origin", reference)
		}
	}
	if provenanceCount != 3 {
		t.Fatalf("NPC generated provenance count = %d, want spell extract plus combat extract/normalize", provenanceCount)
	}
	sceneProvenanceCount := 0
	for _, reference := range output.Manifest.References {
		if reference.SlotName == "scene_descriptions" {
			sceneProvenanceCount++
			if reference.Stage != string(pipeline.StageExtract) || reference.StepID != "grounded-events" || reference.LaneID != "combat" || reference.OriginType != "generated" || reference.Digest != sceneDigest || reference.ArtifactKind != string(dnd.SceneDescriptionListKind) || reference.SchemaID != scenecodec.SchemaID || reference.SchemaName != scenecodec.SchemaName || reference.SchemaVersion != scenecodec.SchemaVersion || reference.MediaType != scenecodec.MediaType || reference.ProducerPipeline != "dnd-npc-grounded" || reference.ProducerStep != "identify-npcs" || reference.ProducerLane != "scene-descriptions" || reference.ProducerModule != "dnd/scene-descriptions" {
				t.Fatalf("scene generated provenance = %#v, want canonical combat handoff identity", reference)
			}
		}
	}
	if sceneProvenanceCount != 1 {
		t.Fatalf("scene generated provenance count = %d, want combat extractor handoff", sceneProvenanceCount)
	}
	assertGeneratedSceneDependency(t, checkpoint.extractDependencies("combat"))
	manifestContent, err := json.Marshal(output.Manifest)
	if err != nil {
		t.Fatal(err)
	}
	for _, forbidden := range []string{"Mira Thorn", "Hooded Guard", "For every NPC record", "Extract Dungeons & Dragons", "A combat encounter", "The party faces an active encounter.", "Mira Thorn asks the party", `"scenes":`} {
		if strings.Contains(string(manifestContent), forbidden) {
			t.Fatalf("manifest exposes prompt or reference payload content %q", forbidden)
		}
	}
	for _, lane := range output.Manifest.ArtifactLanes {
		componentContent, err := json.Marshal(lane.Metadata)
		if err != nil {
			t.Fatalf("marshal %s component metadata: %v", lane.ID, err)
		}
		for _, forbidden := range []string{"A combat encounter", "The party faces an active encounter.", "Mira Thorn asks the party", `"scenes":`} {
			if strings.Contains(string(componentContent), forbidden) {
				t.Fatalf("%s component metadata exposes scene or transcript content %q", lane.ID, forbidden)
			}
		}
		for _, component := range []string{"extractor", "normalizer"} {
			metadata, ok := lane.Metadata[component].(map[string]any)
			if ok && (metadata["npc_registry_digest"] != nil || metadata["scene_eligibility_digest"] != nil) {
				t.Fatalf("%s %s metadata = %#v, want generated identity only in framework provenance", lane.ID, component, metadata)
			}
		}
	}

	var combatValue dnd.CombatTurnList
	for _, serialized := range output.NormalizeOutputs {
		switch serialized.LaneID {
		case "spells":
			spellValue := decodeRunnerSpellResponse(t, serialized.Artifact.Content)
			if len(spellValue.SpellCasts) != 1 || spellValue.SpellCasts[0].Caster != "Mira Thorn" {
				t.Fatalf("spell output = %#v, want one registry-grounded-context spell", spellValue)
			}
			assertCurrentEvidence(t, spellValue.SpellCasts[0].SourceRefs)
		case "combat":
			decoded, decodeErr := combatcodec.New().Decode(serialized.Artifact.Content)
			if decodeErr != nil {
				t.Fatalf("decode combat output: %v", decodeErr)
			}
			combatValue = decoded
		}
	}
	if len(combatValue.CombatTurns) != 1 || combatValue.CombatTurns[0].Actor != "Mira Thorn" {
		t.Fatalf("combat output = %#v, want registry-normalized actor", combatValue)
	}
	assertCurrentEvidence(t, combatValue.CombatTurns[0].SourceRefs)
}

func TestProductionDNDOutputPublishesSelectedEvidenceContext(t *testing.T) {
	registries := productionNPCRegistries(t)
	configValue := loadGroundedPipelineConfig(t)
	profile := configValue.Pipelines["dnd-npc-grounded"]
	profile.Output.Options = map[string]any{"evidence_context": map[string]any{
		"enabled": true, "window_units": 0, "lanes": []any{"npc_registry", "spells", "combat"},
	}}
	configValue.Pipelines["dnd-npc-grounded"] = profile
	raw := strings.NewReplacer(
		`"id": 1`, `"id": 10`,
		`"id": 2`, `"id": 30`,
		`"id": 3`, `"id": 20`,
		`"id": 4`, `"id": 50`,
		`"id": 5`, `"id": 40`,
	).Replace(string(readNPCFixture(t)))
	output := runGroundedPipelineWithRaw(t, configValue, registries, &groundedDNDLLMClient{firstUnitID: 10, thirdUnitID: 20}, nil, []byte(raw))

	value, err := evidencecontext.New().Decode(outputFileContent(t, output.OutputFiles, "evidence-context.json"))
	if err != nil {
		t.Fatalf("Decode(evidence context) error = %v", err)
	}
	if actual := evidenceUnitIDs(value); !reflect.DeepEqual(actual, []int{10, 20}) {
		t.Fatalf("evidence units = %#v, want deduplicated source-position union without scene descriptions", actual)
	}
}

func TestProductionDNDOutputCanExplicitlySelectSceneDescriptionEvidence(t *testing.T) {
	registries := productionNPCRegistries(t)
	configValue := loadGroundedPipelineConfig(t)
	profile := configValue.Pipelines["dnd-npc-grounded"]
	profile.Output.Options = map[string]any{"evidence_context": map[string]any{
		"enabled": true, "lanes": []any{"scene-descriptions"},
	}}
	configValue.Pipelines["dnd-npc-grounded"] = profile
	output := runGroundedPipeline(t, configValue, registries, &groundedDNDLLMClient{}, nil)

	value, err := evidencecontext.New().Decode(outputFileContent(t, output.OutputFiles, "evidence-context.json"))
	if err != nil {
		t.Fatalf("Decode(evidence context) error = %v", err)
	}
	if len(value) == 0 {
		t.Fatalf("evidence context = %#v, want explicitly selected scene-description source units", value)
	}
}

func evidenceUnitIDs(value evidencecontext.Document) []int {
	ids := make([]int, len(value))
	for index, unit := range value {
		ids[index] = unit.ID
	}
	return ids
}

func TestGroundedPipelineSkipsCombatForExactNarrativeScene(t *testing.T) {
	registries := productionNPCRegistries(t)
	configValue := loadGroundedPipelineConfig(t)
	profile := configValue.Pipelines["dnd-npc-grounded"]
	combat := profile.Steps[1].Artifacts["combat"]
	combat.Extract.Retries = 2
	profile.Steps[1].Artifacts["combat"] = combat
	configValue.Pipelines["dnd-npc-grounded"] = profile

	client := &groundedDNDLLMClient{sceneKind: dnd.SceneKindNarrative}
	output := runGroundedPipeline(t, configValue, registries, client, nil)
	if combatCompletionCount(client.requestsSnapshot()) != 0 {
		t.Fatalf("combat completion requests = %#v, want none for an exact narrative scene", client.requestsSnapshot())
	}
	if len(output.Rejected) != 0 || hasCombatWarning(output.Warnings, "scene_classification_unavailable") {
		t.Fatalf("narrative output rejected/warnings = %#v / %#v, want accepted skip without unavailable warning", output.Rejected, output.Warnings)
	}
	combatValue := normalizedCombatOutput(t, output)
	if combatValue.CombatTurns == nil || len(combatValue.CombatTurns) != 0 {
		t.Fatalf("narrative combat output = %#v, want an accepted empty combat list", combatValue)
	}
}

func TestGeneratedSceneReferenceChangesCombatCheckpointDependency(t *testing.T) {
	registries := productionNPCRegistries(t)
	first := generatedSceneDependency(t, registries, "A combat encounter")
	second := generatedSceneDependency(t, registries, "A revised combat encounter")
	if first == second {
		t.Fatalf("generated combat dependencies = %q and %q, want canonical scene artifact change to invalidate reuse", first, second)
	}
}

func assertFingerprintValue(t *testing.T, fingerprints []pipeline.CheckpointFingerprint, name, want string) {
	t.Helper()
	for _, fingerprint := range fingerprints {
		if fingerprint.Name == name && fingerprint.Value == want {
			return
		}
	}
	t.Fatalf("fingerprints = %#v, want %q = %q", fingerprints, name, want)
}

func assertCurrentEvidence(t *testing.T, references []source.SourceRef) {
	t.Helper()
	for _, reference := range references {
		if reference.SourceID != "npc-session" {
			t.Fatalf("evidence reference = %#v, want current source only", reference)
		}
	}
}

func loadGroundedPipelineConfig(t *testing.T) config.Config {
	t.Helper()
	fileConfig, err := config.LoadFileConfig(repositoryPathForIntegration("internal", "modules", "integration", "testdata", "dnd_npc_grounded_pipeline.yml"))
	if err != nil {
		t.Fatalf("LoadFileConfig() error = %v", err)
	}
	cfg := config.Default()
	if err := cfg.ApplyFileConfig(fileConfig); err != nil {
		t.Fatalf("ApplyFileConfig() error = %v", err)
	}
	return cfg
}

func configureGroundedCampaignReferences(t *testing.T, cfg *config.Config) map[string]string {
	t.Helper()
	values := map[string]string{
		"party":    "Mira Thorn: ally\n",
		"glossary": "Greencloak: Mira Thorn's title\n",
	}
	profile := cfg.Pipelines["dnd-npc-grounded"]
	profile.References = make(map[string]pipeline.ReferenceSource, len(values))
	for name, content := range values {
		path := filepath.Join(t.TempDir(), name+".txt")
		if err := os.WriteFile(path, []byte(content), 0o600); err != nil {
			t.Fatalf("write %s reference: %v", name, err)
		}
		profile.References[name] = pipeline.ExternalReference(path)
	}
	cfg.Pipelines["dnd-npc-grounded"] = profile
	return values
}

func runGroundedPipeline(t *testing.T, configValue config.Config, registries pipeline.Registries, client *groundedDNDLLMClient, checkpoint pipeline.CheckpointLoader) pipeline.RunOutput {
	return runGroundedPipelineWithRaw(t, configValue, registries, client, checkpoint, readNPCFixture(t))
}

func runGroundedPipelineWithRaw(t *testing.T, configValue config.Config, registries pipeline.Registries, client *groundedDNDLLMClient, checkpoint pipeline.CheckpointLoader, raw []byte) pipeline.RunOutput {
	t.Helper()
	catalog := moduleCatalog(registries)
	effective, err := configValue.Resolve(config.ResolveInput{PipelineID: "dnd-npc-grounded", Catalog: catalog})
	if err != nil {
		t.Fatalf("Resolve() error = %v", err)
	}
	materialized, warnings, err := pipeline.MaterializeReferences(effective.ResolvedPipeline, catalog, pipeline.ReferenceMaterializationOptions{})
	if err != nil || len(warnings) != 0 {
		t.Fatalf("MaterializeReferences() error = %v warnings = %#v", err, warnings)
	}
	prepared, err := pipeline.Prepare(materialized, registries, pipeline.ModuleDependencies{LLM: client})
	if err != nil {
		t.Fatalf("Prepare() error = %v", err)
	}
	output, err := pipeline.New().Run(context.Background(), pipeline.RunInput{
		Prepared:       prepared,
		RawInput:       append([]byte(nil), raw...),
		ExtractWorkers: 1,
		Checkpoint:     checkpoint,
	})
	if err != nil {
		t.Fatalf("Run() error = %v", err)
	}
	return output
}

func outputFileContent(t *testing.T, files []contracts.OutputFile, name string) []byte {
	t.Helper()
	for _, file := range files {
		if file.Name == name {
			return append([]byte(nil), file.Bytes...)
		}
	}
	t.Fatalf("output files = %#v, missing %q", files, name)
	return nil
}

func normalizedCombatOutput(t *testing.T, output pipeline.RunOutput) dnd.CombatTurnList {
	t.Helper()
	for _, serialized := range output.NormalizeOutputs {
		if serialized.LaneID != "combat" {
			continue
		}
		value, err := combatcodec.New().Decode(serialized.Artifact.Content)
		if err != nil {
			t.Fatalf("decode combat output: %v", err)
		}
		return value
	}
	t.Fatalf("normalized outputs = %#v, want combat lane", output.NormalizeOutputs)
	return dnd.CombatTurnList{}
}

func combatCompletionCount(requests []contracts.StructuredCompletionRequest) int {
	count := 0
	for _, request := range requests {
		if request.PromptID == combatextract.PromptID {
			count++
		}
	}
	return count
}

func generatedSceneDependency(t *testing.T, registries pipeline.Registries, sceneTitle string) string {
	t.Helper()
	client := &groundedDNDLLMClient{sceneTitle: sceneTitle}
	checkpoint := newGeneratedReferenceCheckpointLoader()
	runGroundedPipeline(t, loadGroundedPipelineConfig(t), registries, client, checkpoint)
	return assertGeneratedSceneDependency(t, checkpoint.extractDependencies("combat"))
}

func assertGeneratedSceneDependency(t *testing.T, dependencies []pipeline.CheckpointFingerprint) string {
	t.Helper()
	for _, dependency := range dependencies {
		if dependency.Name == "generated-reference:scene_descriptions:0" && strings.HasPrefix(dependency.Value, "sha256:") {
			return dependency.Value
		}
	}
	t.Fatalf("combat extract checkpoint dependencies = %#v, want generated scene reference fingerprint", dependencies)
	return ""
}

type generatedReferenceCheckpointLoader struct {
	pipeline.CheckpointLoader
	extract map[string][][]pipeline.CheckpointFingerprint
}

func newGeneratedReferenceCheckpointLoader() *generatedReferenceCheckpointLoader {
	return &generatedReferenceCheckpointLoader{
		CheckpointLoader: pipeline.NoopCheckpointLoader(),
		extract:          make(map[string][][]pipeline.CheckpointFingerprint),
	}
}

func (loader *generatedReferenceCheckpointLoader) Enabled() bool { return true }

func (loader *generatedReferenceCheckpointLoader) Extract(laneID, _ string, dependencies []pipeline.CheckpointFingerprint) (pipeline.ExtractCheckpoint, pipeline.CheckpointDecision) {
	loader.extract[laneID] = append(loader.extract[laneID], append([]pipeline.CheckpointFingerprint(nil), dependencies...))
	return pipeline.ExtractCheckpoint{}, pipeline.NewCheckpointDecision(pipeline.CheckpointDecisionExecuted, pipeline.CheckpointReasonMissing)
}

func (loader *generatedReferenceCheckpointLoader) extractDependencies(laneID string) []pipeline.CheckpointFingerprint {
	if len(loader.extract[laneID]) != 1 {
		return nil
	}
	return loader.extract[laneID][0]
}

type groundedDNDLLMClient struct {
	mu          sync.Mutex
	requests    []contracts.StructuredCompletionRequest
	sceneKind   dnd.SceneKind
	sceneTitle  string
	firstUnitID int
	thirdUnitID int
}

func (client *groundedDNDLLMClient) CompleteStructured(ctx context.Context, request contracts.StructuredCompletionRequest, out any) (contracts.StructuredCompletionResponse, error) {
	if err := ctx.Err(); err != nil {
		return contracts.StructuredCompletionResponse{}, err
	}
	client.mu.Lock()
	client.requests = append(client.requests, cloneStructuredCompletionRequest(request))
	client.mu.Unlock()

	var payload any
	firstUnitID := client.firstUnitID
	if firstUnitID == 0 {
		firstUnitID = 1
	}
	thirdUnitID := client.thirdUnitID
	if thirdUnitID == 0 {
		thirdUnitID = 3
	}
	switch request.PromptID {
	case npcregistry.PromptID:
		payload = map[string]any{"npcs": []any{
			map[string]any{
				"name": "Mira Thorn", "source_refs": []any{map[string]int{"start_unit_id": firstUnitID, "end_unit_id": firstUnitID}},
			},
			map[string]any{
				"name": "Hooded Guard", "source_refs": []any{map[string]int{"start_unit_id": thirdUnitID, "end_unit_id": thirdUnitID}},
			},
		}}
	case npcnormalize.PromptID:
		payload = map[string]any{"duplicate_groups": []any{}}
	case sceneextract.PromptID:
		kind := client.sceneKind
		if kind == "" {
			kind = dnd.SceneKindCombat
		}
		title := client.sceneTitle
		if title == "" {
			title = "A combat encounter"
		}
		payload = map[string]any{"kind": kind, "title": title, "summary": "The party faces an active encounter."}
	case spells.PromptID:
		payload = map[string]any{"spell_casts": []any{map[string]any{
			"caster": "Mira Thorn", "spell": "Cure Wounds",
			"source_refs": []any{map[string]int{"start_unit_id": firstUnitID, "end_unit_id": firstUnitID}},
		}}}
	case combatextract.PromptID:
		payload = map[string]any{"combat_turns": []any{map[string]any{
			"actor":       "Mira Thorn",
			"turn_kind":   "turn",
			"source_refs": []any{map[string]int{"start_unit_id": firstUnitID, "end_unit_id": firstUnitID}},
		}}}
	default:
		return contracts.StructuredCompletionResponse{}, fmt.Errorf("unexpected grounded prompt %q", request.PromptID)
	}
	content, err := json.Marshal(payload)
	if err != nil {
		return contracts.StructuredCompletionResponse{}, err
	}
	if err := json.Unmarshal(content, out); err != nil {
		return contracts.StructuredCompletionResponse{}, fmt.Errorf("populate grounded response: %w", err)
	}
	return contracts.StructuredCompletionResponse{Content: content, Provider: "test", Model: "grounded-fake"}, nil
}

func (client *groundedDNDLLMClient) requestsSnapshot() []contracts.StructuredCompletionRequest {
	client.mu.Lock()
	defer client.mu.Unlock()
	return append([]contracts.StructuredCompletionRequest(nil), client.requests...)
}

func digestBytes(content []byte) string {
	sum := sha256.Sum256(content)
	return fmt.Sprintf("sha256:%x", sum[:])
}

var _ contracts.StructuredLLMClient = (*groundedDNDLLMClient)(nil)