package runner

import (
	"context"
	"errors"
	"os"
	"path/filepath"
	"regexp"
	"strconv"
	"strings"
	"sync"
	"sync/atomic"
	"testing"
	"time"

	"gitea.maximumdirect.net/eric/audita/internal/core/config"
	"gitea.maximumdirect.net/eric/audita/internal/core/schema"
	"gitea.maximumdirect.net/eric/audita/internal/framework/contracts"
	"gitea.maximumdirect.net/eric/audita/internal/framework/llm"
	"gitea.maximumdirect.net/eric/audita/internal/framework/modules"
	"gitea.maximumdirect.net/eric/audita/internal/framework/proposal_generation"
	"gitea.maximumdirect.net/eric/audita/internal/framework/proposals"
	"gitea.maximumdirect.net/eric/audita/internal/framework/responseschema"
	"gitea.maximumdirect.net/eric/audita/internal/framework/validators"
	validatormetadata "gitea.maximumdirect.net/eric/audita/internal/validators/metadata"
)

type fakeFactory struct {
	modules map[string]contracts.TranscriptModule
}

func (f fakeFactory) ModuleForSpec(spec contracts.ModuleRunSpec) (contracts.TranscriptModule, error) {
	m, ok := f.modules[spec.InstanceName]
	if !ok {
		return nil, errors.New("module not registered")
	}
	return m, nil
}

type fakeModule struct {
	key        string
	policy     proposals.ReplacementPolicy
	validators []contracts.Validator
	proposeF   func(req contracts.ProposalRequest) ([]proposals.CorrectionProposal, error)
}

func (m fakeModule) Key() string                                    { return m.key }
func (m fakeModule) ReplacementPolicy() proposals.ReplacementPolicy { return m.policy }
func (m fakeModule) Validators() []contracts.Validator              { return m.validators }
func (m fakeModule) Propose(ctx context.Context, req contracts.ProposalRequest) (contracts.ProposalResult, error) {
	if m.proposeF == nil {
		return contracts.ProposalResult{}, nil
	}
	proposalsOut, err := m.proposeF(req)
	return contracts.ProposalResult{Proposals: proposalsOut}, err
}

type fakeValidator struct {
	name      string
	validateF func(req contracts.ValidationRequest) (validators.Result, error)
}

func (v fakeValidator) Name() string { return v.name }
func (v fakeValidator) Validate(ctx context.Context, req contracts.ValidationRequest) (validators.Result, error) {
	_ = ctx
	return v.validateF(req)
}

type classifiedFakeValidator struct {
	fakeValidator
	class validatormetadata.ExecutionClass
}

func (v classifiedFakeValidator) ExecutionClass() validatormetadata.ExecutionClass {
	return v.class
}

func TestReorderValidatorsDeterministicBeforeLLMBacked(t *testing.T) {
	llm := classifiedFakeValidator{
		fakeValidator: fakeValidator{name: "llm", validateF: func(req contracts.ValidationRequest) (validators.Result, error) {
			return validators.Result{ValidatorName: "llm"}, nil
		}},
		class: validatormetadata.ExecutionClassLLMBacked,
	}
	deterministic := classifiedFakeValidator{
		fakeValidator: fakeValidator{name: "deterministic", validateF: func(req contracts.ValidationRequest) (validators.Result, error) {
			return validators.Result{ValidatorName: "deterministic"}, nil
		}},
		class: validatormetadata.ExecutionClassDeterministic,
	}

	ordered, _ := reorderValidatorsForPipeline([]contracts.Validator{llm, deterministic})
	if len(ordered) != 2 {
		t.Fatalf("expected 2 validators, got %d", len(ordered))
	}
	if ordered[0].Name() != "deterministic" || ordered[1].Name() != "llm" {
		t.Fatalf("unexpected validator order: %s, %s", ordered[0].Name(), ordered[1].Name())
	}
}

func TestReorderValidatorsDefaultsUnclassifiedToDeterministic(t *testing.T) {
	unclassified := fakeValidator{name: "plain", validateF: func(req contracts.ValidationRequest) (validators.Result, error) {
		return validators.Result{ValidatorName: "plain"}, nil
	}}
	llm := classifiedFakeValidator{
		fakeValidator: fakeValidator{name: "llm", validateF: func(req contracts.ValidationRequest) (validators.Result, error) {
			return validators.Result{ValidatorName: "llm"}, nil
		}},
		class: validatormetadata.ExecutionClassLLMBacked,
	}

	ordered, _ := reorderValidatorsForPipeline([]contracts.Validator{llm, unclassified})
	if len(ordered) != 2 {
		t.Fatalf("expected 2 validators, got %d", len(ordered))
	}
	if ordered[0].Name() != "plain" || ordered[1].Name() != "llm" {
		t.Fatalf("unexpected validator order with unclassified validator: %s, %s", ordered[0].Name(), ordered[1].Name())
	}
}

func TestRunnerOneModuleAppliesProposal(t *testing.T) {
	transcript := &schema.Transcript{Segments: []schema.Segment{{ID: 1, Speaker: "A", Start: 0, End: 1, Text: "teh cat"}}}
	r := New(fakeFactory{modules: map[string]contracts.TranscriptModule{
		"grammar": fakeModule{key: "grammar", policy: proposals.ReplacementPolicyRequireUnique, proposeF: func(req contracts.ProposalRequest) ([]proposals.CorrectionProposal, error) {
			return []proposals.CorrectionProposal{{TargetSegmentID: 1, OriginalText: "teh", CorrectedText: "the", Confidence: 0.9}}, nil
		}},
	}})

	out, err := r.Run(context.Background(), RunInput{Transcript: transcript, ModuleSpecs: []contracts.ModuleRunSpec{{ModuleKey: "grammar", InstanceName: "grammar"}}})
	if err != nil {
		t.Fatalf("Run error: %v", err)
	}
	if out.FinalTranscript.Segments[0].Text != "the cat" {
		t.Fatalf("expected corrected text, got %q", out.FinalTranscript.Segments[0].Text)
	}
	if len(out.ModuleResults) != 1 || len(out.ModuleResults[0].AppliedChanges) != 1 {
		t.Fatalf("expected one module with one applied change, got %+v", out.ModuleResults)
	}
}

func TestRunnerModulesRunSequentially(t *testing.T) {
	transcript := &schema.Transcript{Segments: []schema.Segment{{ID: 1, Speaker: "A", Start: 0, End: 1, Text: "teh cat"}}}
	r := New(fakeFactory{modules: map[string]contracts.TranscriptModule{
		"m1": fakeModule{key: "m1", policy: proposals.ReplacementPolicyRequireUnique, proposeF: func(req contracts.ProposalRequest) ([]proposals.CorrectionProposal, error) {
			return []proposals.CorrectionProposal{{TargetSegmentID: 1, OriginalText: "teh", CorrectedText: "the", Confidence: 1}}, nil
		}},
		"m2": fakeModule{key: "m2", policy: proposals.ReplacementPolicyRequireUnique, proposeF: func(req contracts.ProposalRequest) ([]proposals.CorrectionProposal, error) {
			if req.WorkingTranscript.Segments[0].Text != "the cat" {
				t.Fatalf("second module did not see first module changes: %q", req.WorkingTranscript.Segments[0].Text)
			}
			return []proposals.CorrectionProposal{{TargetSegmentID: 1, OriginalText: "cat", CorrectedText: "dog", Confidence: 1}}, nil
		}},
	}})

	out, err := r.Run(context.Background(), RunInput{Transcript: transcript, ModuleSpecs: []contracts.ModuleRunSpec{{ModuleKey: "m1", InstanceName: "m1"}, {ModuleKey: "m2", InstanceName: "m2"}}})
	if err != nil {
		t.Fatalf("Run error: %v", err)
	}
	if out.FinalTranscript.Segments[0].Text != "the dog" {
		t.Fatalf("expected sequential updates, got %q", out.FinalTranscript.Segments[0].Text)
	}
}

func TestRunnerProposalsExecutePerChunkSection(t *testing.T) {
	cfg := config.Default()
	cfg.MaxSectionTokens = 3
	cfg.MinSectionTokens = 0

	transcript := &schema.Transcript{Segments: []schema.Segment{
		{ID: 1, Text: "one two"},
		{ID: 2, Text: "three four"},
		{ID: 3, Text: "five six"},
	}}

	var (
		mu                sync.Mutex
		seenBySection     = make(map[int]contracts.SectionMetadata)
		segmentCountBySec = make(map[int]int)
	)
	r := New(fakeFactory{modules: map[string]contracts.TranscriptModule{
		"m": fakeModule{key: "m", policy: proposals.ReplacementPolicyRequireUnique, proposeF: func(req contracts.ProposalRequest) ([]proposals.CorrectionProposal, error) {
			if req.Section == nil {
				t.Fatalf("expected section metadata on proposal request")
			}
			mu.Lock()
			seenBySection[req.Section.Index] = *req.Section
			segmentCountBySec[req.Section.Index] = len(req.WorkingTranscript.Segments)
			mu.Unlock()
			return nil, nil
		}},
	}})

	out, err := r.Run(context.Background(), RunInput{
		Config:     &cfg,
		Transcript: transcript,
		ModuleSpecs: []contracts.ModuleRunSpec{
			{ModuleKey: "m", InstanceName: "m"},
		},
	})
	if err != nil {
		t.Fatalf("Run error: %v", err)
	}
	if len(out.ModuleResults) != 1 {
		t.Fatalf("expected one module result, got %+v", out.ModuleResults)
	}
	if len(seenBySection) != 3 {
		t.Fatalf("expected 3 chunked proposal calls, got %d", len(seenBySection))
	}
	for i := 0; i < 3; i++ {
		section, ok := seenBySection[i]
		if !ok {
			t.Fatalf("expected section %d to be observed", i)
		}
		if section.Index != i {
			t.Fatalf("expected section index %d, got %+v", i, section)
		}
		if segmentCountBySec[i] != 1 {
			t.Fatalf("expected one segment per section call, got %d at index %d", segmentCountBySec[i], i)
		}
	}
}

func TestRunnerProposalSectionConcurrencyBoundedByProposalLLMConcurrency(t *testing.T) {
	cfg := config.Default()
	cfg.MaxSectionTokens = 3
	cfg.MinSectionTokens = 0
	cfg.TotalLLMConcurrency = 2
	cfg.ProposalLLMConcurrency = 2

	transcript := &schema.Transcript{Segments: []schema.Segment{
		{ID: 1, Text: "one two"},
		{ID: 2, Text: "three four"},
		{ID: 3, Text: "five six"},
		{ID: 4, Text: "seven eight"},
	}}

	var inFlight int32
	var maxInFlight int32
	entered := make(chan struct{}, len(transcript.Segments))
	release := make(chan struct{})
	scheduler, err := llm.NewScheduler(2)
	if err != nil {
		t.Fatalf("NewScheduler: %v", err)
	}
	r := New(fakeFactory{modules: map[string]contracts.TranscriptModule{
		"m": fakeModule{key: "m", policy: proposals.ReplacementPolicyRequireUnique, proposeF: func(req contracts.ProposalRequest) ([]proposals.CorrectionProposal, error) {
			err := req.LLMScheduler.Run(context.Background(), func(context.Context) error {
				current := atomic.AddInt32(&inFlight, 1)
				for {
					prior := atomic.LoadInt32(&maxInFlight)
					if current <= prior || atomic.CompareAndSwapInt32(&maxInFlight, prior, current) {
						break
					}
				}
				entered <- struct{}{}
				<-release
				atomic.AddInt32(&inFlight, -1)
				return nil
			})
			if err != nil {
				return nil, err
			}
			return nil, nil
		}},
	}})

	resultCh := make(chan error, 1)
	go func() {
		_, err := r.Run(context.Background(), RunInput{
			Config:               &cfg,
			Transcript:           transcript,
			ProposalLLMScheduler: scheduler,
			ModuleSpecs: []contracts.ModuleRunSpec{
				{ModuleKey: "m", InstanceName: "m"},
			},
		})
		resultCh <- err
	}()

	waitForRunnerEntries(t, entered, 2, "proposal workers to enter")
	close(release)

	err = <-resultCh
	if err != nil {
		t.Fatalf("Run error: %v", err)
	}
	if maxInFlight < 2 {
		t.Fatalf("expected proposal execution to run concurrently, got max in-flight %d", maxInFlight)
	}
	if maxInFlight > 2 {
		t.Fatalf("expected proposal concurrency <= 2, got %d", maxInFlight)
	}
}

func TestRunnerProposalIndexOrderingIsDeterministicAcrossParallelSections(t *testing.T) {
	cfg := config.Default()
	cfg.MaxSectionTokens = 3
	cfg.MinSectionTokens = 0
	cfg.TotalLLMConcurrency = 3
	cfg.ProposalLLMConcurrency = 3

	transcript := &schema.Transcript{Segments: []schema.Segment{
		{ID: 1, Text: "alpha one"},
		{ID: 2, Text: "bravo two"},
		{ID: 3, Text: "charlie three"},
	}}

	started := make(chan int, len(transcript.Segments))
	releaseByID := map[int]chan struct{}{
		1: make(chan struct{}),
		2: make(chan struct{}),
		3: make(chan struct{}),
	}

	r := New(fakeFactory{modules: map[string]contracts.TranscriptModule{
		"m": fakeModule{key: "m", policy: proposals.ReplacementPolicyRequireUnique, proposeF: func(req contracts.ProposalRequest) ([]proposals.CorrectionProposal, error) {
			if len(req.WorkingTranscript.Segments) != 1 {
				t.Fatalf("expected one segment per section, got %d", len(req.WorkingTranscript.Segments))
			}
			seg := req.WorkingTranscript.Segments[0]
			started <- seg.ID
			<-releaseByID[seg.ID]
			return []proposals.CorrectionProposal{
				{TargetSegmentID: seg.ID, OriginalText: seg.Text, CorrectedText: strings.ToUpper(seg.Text), Confidence: 1},
			}, nil
		}},
	}})

	resultCh := make(chan struct {
		out RunOutput
		err error
	}, 1)
	go func() {
		out, err := r.Run(context.Background(), RunInput{
			Config:     &cfg,
			Transcript: transcript,
			ModuleSpecs: []contracts.ModuleRunSpec{
				{ModuleKey: "m", InstanceName: "m"},
			},
		})
		resultCh <- struct {
			out RunOutput
			err error
		}{out: out, err: err}
	}()

	waitForRunnerSectionIDs(t, started, map[int]struct{}{1: {}, 2: {}, 3: {}})
	close(releaseByID[3])
	close(releaseByID[2])
	close(releaseByID[1])

	result := <-resultCh
	out, err := result.out, result.err
	if err != nil {
		t.Fatalf("Run error: %v", err)
	}
	if len(out.ModuleResults) != 1 {
		t.Fatalf("expected one module result, got %+v", out.ModuleResults)
	}
	if got := len(out.ModuleResults[0].AppliedChanges); got != 3 {
		t.Fatalf("expected three applied changes, got %d", got)
	}
	for i, change := range out.ModuleResults[0].AppliedChanges {
		wantID := i + 1
		if change.TargetSegmentID != wantID {
			t.Fatalf("expected deterministic applied-change order by section/segment, got %+v", out.ModuleResults[0].AppliedChanges)
		}
	}
	wantFinal := []string{"ALPHA ONE", "BRAVO TWO", "CHARLIE THREE"}
	for i, seg := range out.FinalTranscript.Segments {
		if seg.Text != wantFinal[i] {
			t.Fatalf("expected deterministic final transcript regardless of section completion order; got %+v", out.FinalTranscript.Segments)
		}
	}
}

func waitForRunnerEntries(t *testing.T, entered <-chan struct{}, want int, label string) {
	t.Helper()
	deadline := time.After(350 * time.Millisecond)
	got := 0
	for got < want {
		select {
		case <-entered:
			got++
		case <-deadline:
			t.Fatalf("timed out waiting for %d entries (%s), got %d", want, label, got)
		}
	}
}

func waitForRunnerSectionIDs(t *testing.T, started <-chan int, want map[int]struct{}) {
	t.Helper()
	deadline := time.After(350 * time.Millisecond)
	seen := map[int]struct{}{}
	for len(seen) < len(want) {
		select {
		case id := <-started:
			seen[id] = struct{}{}
		case <-deadline:
			t.Fatalf("timed out waiting for section IDs %v, got %v", mapKeys(want), mapKeys(seen))
		}
	}
}

func mapKeys(values map[int]struct{}) []int {
	keys := make([]int, 0, len(values))
	for key := range values {
		keys = append(keys, key)
	}
	return keys
}

func TestRunnerValidationStartsBeforeAllSectionProposalsComplete(t *testing.T) {
	cfg := config.Default()
	cfg.MaxSectionTokens = 3
	cfg.MinSectionTokens = 0
	cfg.TotalLLMConcurrency = 2
	cfg.ProposalLLMConcurrency = 2

	transcript := &schema.Transcript{Segments: []schema.Segment{
		{ID: 1, Text: "alpha one"},
		{ID: 2, Text: "bravo two"},
	}}

	releaseSectionOne := make(chan struct{})
	validatorStarted := make(chan struct{}, 1)

	validator := fakeValidator{
		name: "capture",
		validateF: func(req contracts.ValidationRequest) (validators.Result, error) {
			if len(req.CandidateProposal) == 1 && req.CandidateProposal[0].TargetSegmentID == 1 {
				select {
				case validatorStarted <- struct{}{}:
				default:
				}
			}
			decisions := make([]validators.Decision, 0, len(req.CandidateProposal))
			for _, p := range req.CandidateProposal {
				decisions = append(decisions, validators.Decision{
					ProposalIndex: p.ProposalIndex,
					Approved:      true,
					ReasonCode:    validators.ReasonApproved,
					Message:       "ok",
				})
			}
			return validators.Result{ValidatorName: "capture", Decisions: decisions}, nil
		},
	}

	r := New(fakeFactory{modules: map[string]contracts.TranscriptModule{
		"m": fakeModule{
			key:        "m",
			policy:     proposals.ReplacementPolicyRequireUnique,
			validators: []contracts.Validator{validator},
			proposeF: func(req contracts.ProposalRequest) ([]proposals.CorrectionProposal, error) {
				seg := req.WorkingTranscript.Segments[0]
				if req.Section != nil && req.Section.Index == 1 {
					<-releaseSectionOne
				}
				return []proposals.CorrectionProposal{
					{TargetSegmentID: seg.ID, OriginalText: seg.Text, CorrectedText: strings.ToUpper(seg.Text), Confidence: 1},
				}, nil
			},
		},
	}})

	resultCh := make(chan error, 1)
	go func() {
		_, err := r.Run(context.Background(), RunInput{
			Config:     &cfg,
			Transcript: transcript,
			ModuleSpecs: []contracts.ModuleRunSpec{
				{ModuleKey: "m", InstanceName: "m"},
			},
		})
		resultCh <- err
	}()

	select {
	case <-validatorStarted:
	case <-time.After(350 * time.Millisecond):
		t.Fatal("expected section-level validator work before all proposal sections complete")
	}

	close(releaseSectionOne)
	if err := <-resultCh; err != nil {
		t.Fatalf("Run error: %v", err)
	}
}

func TestRunnerProposalAndValidationLLMCanOverlapWithinModule(t *testing.T) {
	cfg := config.Default()
	cfg.MaxSectionTokens = 3
	cfg.MinSectionTokens = 0
	cfg.TotalLLMConcurrency = 2
	cfg.ProposalLLMConcurrency = 2
	validationCap := 2
	cfg.ValidationLLMConcurrency = &validationCap

	transcript := &schema.Transcript{Segments: []schema.Segment{
		{ID: 1, Text: "alpha one"},
		{ID: 2, Text: "bravo two"},
	}}

	global, err := llm.NewScheduler(2)
	if err != nil {
		t.Fatalf("NewScheduler: %v", err)
	}
	scheduler := &trackingScheduler{inner: global}

	proposalSectionOneStarted := make(chan struct{}, 1)
	releaseProposalSectionOne := make(chan struct{})

	releaseValidation := make(chan struct{})
	client := &stageAwareStructuredClient{
		startedSection:    make(chan int, 8),
		releaseValidation: releaseValidation,
	}
	llmValidator, err := validators.NewLLMBackedValidator("spoken_form_plausibility_review", validators.LLMValidatorTypeSpokenFormPlausibility, "")
	if err != nil {
		t.Fatalf("NewLLMBackedValidator: %v", err)
	}

	r := New(fakeFactory{modules: map[string]contracts.TranscriptModule{
		"m": fakeModule{
			key:        "m",
			policy:     proposals.ReplacementPolicyRequireUnique,
			validators: []contracts.Validator{llmValidator},
			proposeF: func(req contracts.ProposalRequest) ([]proposals.CorrectionProposal, error) {
				seg := req.WorkingTranscript.Segments[0]
				err := req.LLMScheduler.Run(context.Background(), func(context.Context) error {
					if req.Section != nil && req.Section.Index == 1 {
						select {
						case proposalSectionOneStarted <- struct{}{}:
						default:
						}
						<-releaseProposalSectionOne
					}
					return nil
				})
				if err != nil {
					return nil, err
				}
				return []proposals.CorrectionProposal{
					{TargetSegmentID: seg.ID, OriginalText: seg.Text, CorrectedText: strings.ToUpper(seg.Text), Confidence: 1},
				}, nil
			},
		},
	}})

	resultCh := make(chan struct {
		out RunOutput
		err error
	}, 1)
	go func() {
		out, err := r.Run(context.Background(), RunInput{
			Config:                 &cfg,
			Transcript:             transcript,
			ModuleSpecs:            []contracts.ModuleRunSpec{{ModuleKey: "m", InstanceName: "m"}},
			ProposalLLMScheduler:   scheduler,
			ValidationLLMScheduler: scheduler,
			ValidationLLMClient:    client,
		})
		resultCh <- struct {
			out RunOutput
			err error
		}{out: out, err: err}
	}()

	select {
	case <-proposalSectionOneStarted:
	case <-time.After(350 * time.Millisecond):
		t.Fatal("expected section-1 proposal to start")
	}

	select {
	case section := <-client.startedSection:
		if section != 0 {
			t.Fatalf("expected first validation to start for section 0, got section %d", section)
		}
	case <-time.After(350 * time.Millisecond):
		t.Fatal("expected validation call for section 0 while later section proposal still running")
	}

	close(releaseProposalSectionOne)
	close(releaseValidation)

	result := <-resultCh
	if result.err != nil {
		t.Fatalf("Run error: %v", result.err)
	}
	if got := atomic.LoadInt32(&scheduler.maxInFlight); got > 2 {
		t.Fatalf("expected combined proposal+validation in-flight <= 2, got %d", got)
	}
	if got := atomic.LoadInt32(&scheduler.maxInFlight); got < 2 {
		t.Fatalf("expected observed overlap/in-flight utilization of at least 2, got %d", got)
	}
}

func TestRunnerValidationLLMConcurrencyRespected(t *testing.T) {
	cfg := config.Default()
	cfg.MaxSectionTokens = 3
	cfg.MinSectionTokens = 0
	cfg.TotalLLMConcurrency = 4
	cfg.ProposalLLMConcurrency = 4
	validationCap := 1
	cfg.ValidationLLMConcurrency = &validationCap

	transcript := &schema.Transcript{Segments: []schema.Segment{
		{ID: 1, Text: "one one"},
		{ID: 2, Text: "two two"},
		{ID: 3, Text: "three three"},
	}}

	validationSchedulerInner, err := llm.NewScheduler(1)
	if err != nil {
		t.Fatalf("NewScheduler(validation): %v", err)
	}
	validationScheduler := &trackingScheduler{inner: validationSchedulerInner}

	releaseValidation := make(chan struct{})
	client := &stageAwareStructuredClient{
		startedSection:    make(chan int, 16),
		releaseValidation: releaseValidation,
	}
	llmValidator, err := validators.NewLLMBackedValidator("spoken_form_plausibility_review", validators.LLMValidatorTypeSpokenFormPlausibility, "")
	if err != nil {
		t.Fatalf("NewLLMBackedValidator: %v", err)
	}

	r := New(fakeFactory{modules: map[string]contracts.TranscriptModule{
		"m": fakeModule{
			key:        "m",
			policy:     proposals.ReplacementPolicyRequireUnique,
			validators: []contracts.Validator{llmValidator},
			proposeF: func(req contracts.ProposalRequest) ([]proposals.CorrectionProposal, error) {
				seg := req.WorkingTranscript.Segments[0]
				return []proposals.CorrectionProposal{
					{TargetSegmentID: seg.ID, OriginalText: seg.Text, CorrectedText: strings.ToUpper(seg.Text), Confidence: 1},
				}, nil
			},
		},
	}})

	resultCh := make(chan error, 1)
	go func() {
		_, err := r.Run(context.Background(), RunInput{
			Config:                 &cfg,
			Transcript:             transcript,
			ModuleSpecs:            []contracts.ModuleRunSpec{{ModuleKey: "m", InstanceName: "m"}},
			ValidationLLMScheduler: validationScheduler,
			ValidationLLMClient:    client,
		})
		resultCh <- err
	}()

	select {
	case <-client.startedSection:
	case <-time.After(350 * time.Millisecond):
		t.Fatal("expected validation to start")
	}
	close(releaseValidation)

	if err := <-resultCh; err != nil {
		t.Fatalf("Run error: %v", err)
	}
	if got := atomic.LoadInt32(&validationScheduler.maxInFlight); got > 1 {
		t.Fatalf("expected validation in-flight <= 1, got %d", got)
	}
}

func TestRunnerMixedProposalValidationFIFOOrder(t *testing.T) {
	cfg := config.Default()
	cfg.MaxSectionTokens = 3
	cfg.MinSectionTokens = 0
	cfg.TotalLLMConcurrency = 1
	cfg.ProposalLLMConcurrency = 1
	validationCap := 1
	cfg.ValidationLLMConcurrency = &validationCap

	transcript := &schema.Transcript{Segments: []schema.Segment{
		{ID: 1, Text: "alpha one"},
		{ID: 2, Text: "bravo two"},
	}}

	global, err := llm.NewScheduler(1)
	if err != nil {
		t.Fatalf("NewScheduler: %v", err)
	}
	proposalScheduler := global
	validationScheduler := global

	events := make(chan string, 8)
	releaseProposalSectionOne := make(chan struct{})
	releaseValidation := make(chan struct{})
	sectionZeroEntered := make(chan struct{})
	sectionOneAttempted := make(chan struct{}, 1)

	client := &stageAwareStructuredClient{
		startedSection:    make(chan int, 8),
		releaseValidation: releaseValidation,
		eventSink:         events,
	}
	llmValidator, err := validators.NewLLMBackedValidator("spoken_form_plausibility_review", validators.LLMValidatorTypeSpokenFormPlausibility, "")
	if err != nil {
		t.Fatalf("NewLLMBackedValidator: %v", err)
	}

	r := New(fakeFactory{modules: map[string]contracts.TranscriptModule{
		"m": fakeModule{
			key:        "m",
			policy:     proposals.ReplacementPolicyRequireUnique,
			validators: []contracts.Validator{llmValidator},
			proposeF: func(req contracts.ProposalRequest) ([]proposals.CorrectionProposal, error) {
				seg := req.WorkingTranscript.Segments[0]
				if req.Section != nil && req.Section.Index == 1 {
					<-sectionZeroEntered
					select {
					case sectionOneAttempted <- struct{}{}:
					default:
					}
				}
				err := req.LLMScheduler.Run(context.Background(), func(context.Context) error {
					if req.Section != nil {
						events <- "p" + strconv.Itoa(req.Section.Index)
						if req.Section.Index == 0 {
							select {
							case sectionZeroEntered <- struct{}{}:
							default:
							}
							<-sectionOneAttempted
						}
						if req.Section.Index == 1 {
							<-releaseProposalSectionOne
						}
					}
					return nil
				})
				if err != nil {
					return nil, err
				}
				return []proposals.CorrectionProposal{
					{TargetSegmentID: seg.ID, OriginalText: seg.Text, CorrectedText: strings.ToUpper(seg.Text), Confidence: 1},
				}, nil
			},
		},
	}})

	resultCh := make(chan error, 1)
	go func() {
		_, err := r.Run(context.Background(), RunInput{
			Config:                 &cfg,
			Transcript:             transcript,
			ModuleSpecs:            []contracts.ModuleRunSpec{{ModuleKey: "m", InstanceName: "m"}},
			ProposalLLMScheduler:   proposalScheduler,
			ValidationLLMScheduler: validationScheduler,
			ValidationLLMClient:    client,
		})
		resultCh <- err
	}()

	if got := <-events; got != "p0" {
		t.Fatalf("expected first event p0, got %q", got)
	}
	if got := <-events; got != "p1" {
		t.Fatalf("expected second event p1 (FIFO queued proposal), got %q", got)
	}

	close(releaseProposalSectionOne)
	close(releaseValidation)

	if got := <-events; !strings.HasPrefix(got, "v") {
		t.Fatalf("expected validator event after queued p1, got %q", got)
	}

	if err := <-resultCh; err != nil {
		t.Fatalf("Run error: %v", err)
	}
}

var sectionStagePattern = regexp.MustCompile(`section-(\d+)`)

type stageAwareStructuredClient struct {
	startedSection    chan int
	releaseValidation <-chan struct{}
	eventSink         chan<- string
}

type captureContractStructuredClient struct {
	lastRequest contracts.StructuredCompletionRequest
}

func (c *captureContractStructuredClient) CompleteStructured(ctx context.Context, req contracts.StructuredCompletionRequest, out any) (contracts.StructuredCompletionResponse, error) {
	_ = ctx
	c.lastRequest = req
	if target, ok := out.(*validators.LLMValidationResponse); ok {
		*target = validators.LLMValidationResponse{
			Validations: []validators.LLMValidationDecision{
				{CorrectionIndex: 0, Approved: true, Confidence: 0.9, Reason: "ok"},
			},
		}
	}
	return contracts.StructuredCompletionResponse{}, nil
}

func (c *stageAwareStructuredClient) CompleteStructured(ctx context.Context, req contracts.StructuredCompletionRequest, out any) (contracts.StructuredCompletionResponse, error) {
	section := parseSectionFromStage(req.StageName)
	if c.startedSection != nil {
		select {
		case c.startedSection <- section:
		default:
		}
	}
	if c.eventSink != nil {
		c.eventSink <- "v" + strconv.Itoa(section)
	}
	if c.releaseValidation != nil {
		select {
		case <-c.releaseValidation:
		case <-ctx.Done():
			return contracts.StructuredCompletionResponse{}, ctx.Err()
		}
	}

	target := out.(*validators.LLMValidationResponse)
	*target = validators.LLMValidationResponse{
		Validations: []validators.LLMValidationDecision{
			{CorrectionIndex: section, Approved: true, Confidence: 0.99, Reason: "ok"},
		},
	}
	return contracts.StructuredCompletionResponse{}, nil
}

func parseSectionFromStage(stage string) int {
	match := sectionStagePattern.FindStringSubmatch(stage)
	if len(match) != 2 {
		return 0
	}
	n, err := strconv.Atoi(match[1])
	if err != nil {
		return 0
	}
	return n
}

func TestValidationLLMClientAdapterPassesResponseSchema(t *testing.T) {
	capture := &captureContractStructuredClient{}
	adapter := validationLLMClientAdapter{client: capture}
	schema := responseschema.MustLookup(responseschema.ValidatorDecisionSetKey)

	_, err := adapter.CompleteStructured(context.Background(), validators.StructuredCompletionRequest{
		StageName: "module:validator:batch-0000",
		Messages: []validators.LLMMessage{
			{Role: "system", Content: "system"},
			{Role: "user", Content: "user"},
		},
		Model:          "test-model",
		ResponseSchema: &schema,
	}, &validators.LLMValidationResponse{})
	if err != nil {
		t.Fatalf("CompleteStructured error: %v", err)
	}

	if capture.lastRequest.ResponseSchema == nil {
		t.Fatalf("expected response schema to be forwarded")
	}
	if capture.lastRequest.ResponseSchema.ID != schema.ID ||
		capture.lastRequest.ResponseSchema.Version != schema.Version ||
		capture.lastRequest.ResponseSchema.Name != schema.Name ||
		capture.lastRequest.ResponseSchema.SHA256 != schema.SHA256 {
		t.Fatalf("unexpected forwarded schema metadata: got=%+v want=%+v", *capture.lastRequest.ResponseSchema, schema)
	}
}

type trackingScheduler struct {
	inner       contracts.LLMScheduler
	inFlight    int32
	maxInFlight int32
}

func (s *trackingScheduler) Run(ctx context.Context, fn func(context.Context) error) error {
	return s.inner.Run(ctx, func(callCtx context.Context) error {
		current := atomic.AddInt32(&s.inFlight, 1)
		for {
			prior := atomic.LoadInt32(&s.maxInFlight)
			if current <= prior || atomic.CompareAndSwapInt32(&s.maxInFlight, prior, current) {
				break
			}
		}
		defer atomic.AddInt32(&s.inFlight, -1)
		return fn(callCtx)
	})
}

func TestRunnerSkippedRecorded(t *testing.T) {
	transcript := &schema.Transcript{Segments: []schema.Segment{{ID: 1, Speaker: "A", Start: 0, End: 1, Text: "word word"}}}
	r := New(fakeFactory{modules: map[string]contracts.TranscriptModule{
		"m": fakeModule{key: "m", policy: proposals.ReplacementPolicyRequireUnique, proposeF: func(req contracts.ProposalRequest) ([]proposals.CorrectionProposal, error) {
			return []proposals.CorrectionProposal{{TargetSegmentID: 1, OriginalText: "word", CorrectedText: "term", Confidence: 1}}, nil
		}},
	}})
	out, err := r.Run(context.Background(), RunInput{Transcript: transcript, ModuleSpecs: []contracts.ModuleRunSpec{{ModuleKey: "m", InstanceName: "m"}}})
	if err != nil {
		t.Fatalf("Run error: %v", err)
	}
	if len(out.ModuleResults[0].SkippedChanges) != 1 {
		t.Fatalf("expected one skipped change, got %+v", out.ModuleResults[0].SkippedChanges)
	}
}

func TestRunnerFailureReturnsPartialProgress(t *testing.T) {
	transcript := &schema.Transcript{Segments: []schema.Segment{{ID: 1, Speaker: "A", Start: 0, End: 1, Text: "teh cat"}}}
	r := New(fakeFactory{modules: map[string]contracts.TranscriptModule{
		"m1": fakeModule{key: "m1", policy: proposals.ReplacementPolicyRequireUnique, proposeF: func(req contracts.ProposalRequest) ([]proposals.CorrectionProposal, error) {
			return []proposals.CorrectionProposal{{TargetSegmentID: 1, OriginalText: "teh", CorrectedText: "the", Confidence: 1}}, nil
		}},
		"m2": fakeModule{key: "m2", policy: proposals.ReplacementPolicyRequireUnique, proposeF: func(req contracts.ProposalRequest) ([]proposals.CorrectionProposal, error) {
			return nil, errors.New("boom")
		}},
	}})

	out, err := r.Run(context.Background(), RunInput{Transcript: transcript, ModuleSpecs: []contracts.ModuleRunSpec{{ModuleKey: "m1", InstanceName: "m1"}, {ModuleKey: "m2", InstanceName: "m2"}}})
	if err == nil {
		t.Fatal("expected error")
	}
	if out.FinalTranscript.Segments[0].Text != "the cat" {
		t.Fatalf("expected partial transcript progress preserved, got %q", out.FinalTranscript.Segments[0].Text)
	}
	if len(out.ModuleResults) != 2 || out.ModuleResults[1].Status != ModuleStatusFailed {
		t.Fatalf("expected second module failed in results, got %+v", out.ModuleResults)
	}
}

func TestRunnerDoesNotMutateInputTranscript(t *testing.T) {
	transcript := &schema.Transcript{Segments: []schema.Segment{{ID: 1, Speaker: "A", Start: 0, End: 1, Text: "teh"}}}
	before := transcript.Segments[0].Text
	r := New(fakeFactory{modules: map[string]contracts.TranscriptModule{
		"m": fakeModule{key: "m", policy: proposals.ReplacementPolicyRequireUnique, proposeF: func(req contracts.ProposalRequest) ([]proposals.CorrectionProposal, error) {
			return []proposals.CorrectionProposal{{TargetSegmentID: 1, OriginalText: "teh", CorrectedText: "the", Confidence: 1}}, nil
		}},
	}})

	_, err := r.Run(context.Background(), RunInput{Config: ptrConfig(config.Default()), Transcript: transcript, ModuleSpecs: []contracts.ModuleRunSpec{{ModuleKey: "m", InstanceName: "m"}}})
	if err != nil {
		t.Fatalf("Run error: %v", err)
	}
	if transcript.Segments[0].Text != before {
		t.Fatalf("expected input transcript unchanged, got %q", transcript.Segments[0].Text)
	}
}

func TestRunnerRepeatedModuleInstanceNames(t *testing.T) {
	specs, err := contracts.ResolveModuleRunSpecs([]string{"glossary", "glossary"})
	if err != nil {
		t.Fatalf("ResolveModuleRunSpecs error: %v", err)
	}
	if specs[0].InstanceName != "glossary_1" || specs[1].InstanceName != "glossary_2" {
		t.Fatalf("unexpected instance names: %+v", specs)
	}
}

func TestRunnerValidatorApprovedProposalApplied(t *testing.T) {
	transcript := &schema.Transcript{Segments: []schema.Segment{{ID: 1, Text: "teh cat"}}}
	allowAll := fakeValidator{name: "allow", validateF: func(req contracts.ValidationRequest) (validators.Result, error) {
		decisions := make([]validators.Decision, len(req.CandidateProposal))
		for i, p := range req.CandidateProposal {
			decisions[i] = validators.Decision{ProposalIndex: p.ProposalIndex, Approved: true, ReasonCode: validators.ReasonApproved, Message: "approved"}
		}
		return validators.Result{ValidatorName: "allow", Decisions: decisions}, nil
	}}
	r := New(fakeFactory{modules: map[string]contracts.TranscriptModule{
		"m": fakeModule{
			key:        "m",
			policy:     proposals.ReplacementPolicyRequireUnique,
			validators: []contracts.Validator{allowAll},
			proposeF: func(req contracts.ProposalRequest) ([]proposals.CorrectionProposal, error) {
				return []proposals.CorrectionProposal{{TargetSegmentID: 1, OriginalText: "teh", CorrectedText: "the", Confidence: 1}}, nil
			},
		},
	}})

	out, err := r.Run(context.Background(), RunInput{Transcript: transcript, ModuleSpecs: []contracts.ModuleRunSpec{{ModuleKey: "m", InstanceName: "m"}}})
	if err != nil {
		t.Fatalf("Run error: %v", err)
	}
	if out.FinalTranscript.Segments[0].Text != "the cat" {
		t.Fatalf("expected proposal applied, got %q", out.FinalTranscript.Segments[0].Text)
	}
	if len(out.ModuleResults[0].ValidatorDecisions) != 1 {
		t.Fatalf("expected validator decisions recorded")
	}
}

func TestRunnerValidatorRejectedProposalNotApplied(t *testing.T) {
	transcript := &schema.Transcript{Segments: []schema.Segment{{ID: 1, Text: "teh cat"}}}
	rejectAll := fakeValidator{name: "reject", validateF: func(req contracts.ValidationRequest) (validators.Result, error) {
		decisions := make([]validators.Decision, len(req.CandidateProposal))
		for i, p := range req.CandidateProposal {
			decisions[i] = validators.Decision{ProposalIndex: p.ProposalIndex, Approved: false, ReasonCode: validators.ReasonNoEffect, Message: "rejected"}
		}
		return validators.Result{ValidatorName: "reject", Decisions: decisions}, nil
	}}
	r := New(fakeFactory{modules: map[string]contracts.TranscriptModule{
		"m": fakeModule{key: "m", policy: proposals.ReplacementPolicyRequireUnique, validators: []contracts.Validator{rejectAll}, proposeF: func(req contracts.ProposalRequest) ([]proposals.CorrectionProposal, error) {
			return []proposals.CorrectionProposal{{TargetSegmentID: 1, OriginalText: "teh", CorrectedText: "the", Confidence: 1}}, nil
		}},
	}})
	out, err := r.Run(context.Background(), RunInput{Transcript: transcript, ModuleSpecs: []contracts.ModuleRunSpec{{ModuleKey: "m", InstanceName: "m"}}})
	if err != nil {
		t.Fatalf("Run error: %v", err)
	}
	if out.FinalTranscript.Segments[0].Text != "teh cat" {
		t.Fatalf("expected rejected proposal not applied, got %q", out.FinalTranscript.Segments[0].Text)
	}
	if len(out.ModuleResults[0].ValidatorRejected) != 1 {
		t.Fatalf("expected validator rejection recorded, got %+v", out.ModuleResults[0].ValidatorRejected)
	}
}

func TestRunnerMultipleValidatorsRunInOrderAndFilterSurvivors(t *testing.T) {
	transcript := &schema.Transcript{Segments: []schema.Segment{{ID: 1, Text: "one two"}}}
	first := fakeValidator{name: "first", validateF: func(req contracts.ValidationRequest) (validators.Result, error) {
		if len(req.CandidateProposal) != 2 {
			t.Fatalf("expected first validator to see 2 candidates, got %d", len(req.CandidateProposal))
		}
		return validators.Result{
			ValidatorName: "first",
			Decisions: []validators.Decision{
				{ProposalIndex: req.CandidateProposal[0].ProposalIndex, Approved: true, ReasonCode: validators.ReasonApproved, Message: "ok"},
				{ProposalIndex: req.CandidateProposal[1].ProposalIndex, Approved: false, ReasonCode: validators.ReasonNoEffect, Message: "reject"},
			},
		}, nil
	}}
	second := fakeValidator{name: "second", validateF: func(req contracts.ValidationRequest) (validators.Result, error) {
		if len(req.CandidateProposal) != 1 {
			t.Fatalf("expected second validator to see only survivors, got %d", len(req.CandidateProposal))
		}
		return validators.Result{ValidatorName: "second", Decisions: []validators.Decision{{ProposalIndex: req.CandidateProposal[0].ProposalIndex, Approved: true, ReasonCode: validators.ReasonApproved, Message: "ok"}}}, nil
	}}
	r := New(fakeFactory{modules: map[string]contracts.TranscriptModule{
		"m": fakeModule{key: "m", policy: proposals.ReplacementPolicyRequireUnique, validators: []contracts.Validator{first, second}, proposeF: func(req contracts.ProposalRequest) ([]proposals.CorrectionProposal, error) {
			return []proposals.CorrectionProposal{
				{TargetSegmentID: 1, OriginalText: "one", CorrectedText: "ONE", Confidence: 1},
				{TargetSegmentID: 1, OriginalText: "two", CorrectedText: "TWO", Confidence: 1},
			}, nil
		}},
	}})

	out, err := r.Run(context.Background(), RunInput{Transcript: transcript, ModuleSpecs: []contracts.ModuleRunSpec{{ModuleKey: "m", InstanceName: "m"}}})
	if err != nil {
		t.Fatalf("Run error: %v", err)
	}
	if out.FinalTranscript.Segments[0].Text != "ONE two" {
		t.Fatalf("expected only survivor applied, got %q", out.FinalTranscript.Segments[0].Text)
	}
}

func TestRunnerValidatorCardinalityErrorStopsPipelineWithPartialProgress(t *testing.T) {
	transcript := &schema.Transcript{Segments: []schema.Segment{{ID: 1, Text: "teh cat"}}}
	good := fakeModule{key: "m1", policy: proposals.ReplacementPolicyRequireUnique, proposeF: func(req contracts.ProposalRequest) ([]proposals.CorrectionProposal, error) {
		return []proposals.CorrectionProposal{{TargetSegmentID: 1, OriginalText: "teh", CorrectedText: "the", Confidence: 1}}, nil
	}}
	badValidator := fakeValidator{name: "bad", validateF: func(req contracts.ValidationRequest) (validators.Result, error) {
		// Missing one decision triggers cardinality error.
		return validators.Result{ValidatorName: "bad", Decisions: nil}, nil
	}}
	bad := fakeModule{key: "m2", policy: proposals.ReplacementPolicyRequireUnique, validators: []contracts.Validator{badValidator}, proposeF: func(req contracts.ProposalRequest) ([]proposals.CorrectionProposal, error) {
		return []proposals.CorrectionProposal{{TargetSegmentID: 1, OriginalText: "cat", CorrectedText: "dog", Confidence: 1}}, nil
	}}
	r := New(fakeFactory{modules: map[string]contracts.TranscriptModule{"m1": good, "m2": bad}})

	out, err := r.Run(context.Background(), RunInput{Transcript: transcript, ModuleSpecs: []contracts.ModuleRunSpec{{ModuleKey: "m1", InstanceName: "m1"}, {ModuleKey: "m2", InstanceName: "m2"}}})
	if err == nil {
		t.Fatal("expected cardinality error")
	}
	if out.FinalTranscript.Segments[0].Text != "the cat" {
		t.Fatalf("expected partial progress preserved, got %q", out.FinalTranscript.Segments[0].Text)
	}
	if len(out.ModuleResults) != 2 || out.ModuleResults[1].Status != ModuleStatusFailed {
		t.Fatalf("expected second module failed")
	}
}

func TestRunnerApplicationSkipAfterValidatorApprovalReported(t *testing.T) {
	transcript := &schema.Transcript{Segments: []schema.Segment{{ID: 1, Text: "word word"}}}
	allow := fakeValidator{name: "allow", validateF: func(req contracts.ValidationRequest) (validators.Result, error) {
		return validators.Result{ValidatorName: "allow", Decisions: []validators.Decision{{ProposalIndex: req.CandidateProposal[0].ProposalIndex, Approved: true, ReasonCode: validators.ReasonApproved, Message: "ok"}}}, nil
	}}
	r := New(fakeFactory{modules: map[string]contracts.TranscriptModule{
		"m": fakeModule{key: "m", policy: proposals.ReplacementPolicyRequireUnique, validators: []contracts.Validator{allow}, proposeF: func(req contracts.ProposalRequest) ([]proposals.CorrectionProposal, error) {
			return []proposals.CorrectionProposal{{TargetSegmentID: 1, OriginalText: "word", CorrectedText: "term", Confidence: 1}}, nil
		}},
	}})
	out, err := r.Run(context.Background(), RunInput{Transcript: transcript, ModuleSpecs: []contracts.ModuleRunSpec{{ModuleKey: "m", InstanceName: "m"}}})
	if err != nil {
		t.Fatalf("Run error: %v", err)
	}
	if len(out.ModuleResults[0].SkippedChanges) != 1 {
		t.Fatalf("expected application skip recorded")
	}
	if len(out.ModuleResults[0].ValidatorRejected) != 0 {
		t.Fatalf("expected no validator rejection")
	}
}

func ptrConfig(c config.Config) *config.Config { return &c }

type fakeStructuredClient struct {
	responses []validators.LLMValidationResponse
	err       error
	calls     int
}

func (f *fakeStructuredClient) CompleteStructured(ctx context.Context, req contracts.StructuredCompletionRequest, out any) (contracts.StructuredCompletionResponse, error) {
	_ = ctx
	_ = req
	f.calls++
	if f.err != nil {
		return contracts.StructuredCompletionResponse{}, f.err
	}
	if len(f.responses) == 0 {
		return contracts.StructuredCompletionResponse{}, errors.New("unexpected call")
	}
	resp := f.responses[0]
	f.responses = f.responses[1:]
	target := out.(*validators.LLMValidationResponse)
	*target = resp
	return contracts.StructuredCompletionResponse{}, nil
}

type countingScheduler struct{ runs int }

func (s *countingScheduler) Run(ctx context.Context, fn func(context.Context) error) error {
	s.runs++
	return fn(ctx)
}

type lenEstimator struct{}

func (lenEstimator) EstimateTokens(text string) int { return len(text) }

func TestRunnerLLMValidatorApprovalApplied(t *testing.T) {
	client := &fakeStructuredClient{responses: []validators.LLMValidationResponse{{Validations: []validators.LLMValidationDecision{{CorrectionIndex: 0, Approved: true, Confidence: 0.9, Reason: "ok"}}}}}
	llmValidator, err := validators.NewLLMBackedValidator("spoken_form_plausibility_review", validators.LLMValidatorTypeSpokenFormPlausibility, "")
	if err != nil {
		t.Fatalf("NewLLMBackedValidator: %v", err)
	}

	r := New(fakeFactory{modules: map[string]contracts.TranscriptModule{
		"m": fakeModule{key: "m", policy: proposals.ReplacementPolicyRequireUnique, validators: []contracts.Validator{llmValidator}, proposeF: func(req contracts.ProposalRequest) ([]proposals.CorrectionProposal, error) {
			return []proposals.CorrectionProposal{{TargetSegmentID: 1, OriginalText: "gestures", CorrectedText: "Jesters", Confidence: 1}}, nil
		}},
	}})
	cfg := config.Default()
	out, err := r.Run(context.Background(), RunInput{
		Config:              &cfg,
		Transcript:          &schema.Transcript{Segments: []schema.Segment{{ID: 1, Text: "There were gestures at the temple."}}},
		ModuleSpecs:         []contracts.ModuleRunSpec{{ModuleKey: "m", InstanceName: "m"}},
		ValidationLLMClient: client,
	})
	if err != nil {
		t.Fatalf("Run error: %v", err)
	}
	if out.FinalTranscript.Segments[0].Text != "There were Jesters at the temple." {
		t.Fatalf("expected applied LLM-approved proposal, got %q", out.FinalTranscript.Segments[0].Text)
	}
}

func TestRunnerLLMValidatorRejectionPreventsApplication(t *testing.T) {
	client := &fakeStructuredClient{responses: []validators.LLMValidationResponse{{Validations: []validators.LLMValidationDecision{{CorrectionIndex: 0, Approved: false, Confidence: 0.95, Reason: "reject"}}}}}
	llmValidator, _ := validators.NewLLMBackedValidator("spoken_form_plausibility_review", validators.LLMValidatorTypeSpokenFormPlausibility, "")
	r := New(fakeFactory{modules: map[string]contracts.TranscriptModule{
		"m": fakeModule{key: "m", policy: proposals.ReplacementPolicyRequireUnique, validators: []contracts.Validator{llmValidator}, proposeF: func(req contracts.ProposalRequest) ([]proposals.CorrectionProposal, error) {
			return []proposals.CorrectionProposal{{TargetSegmentID: 1, OriginalText: "gestures", CorrectedText: "Jesters", Confidence: 1}}, nil
		}},
	}})
	cfg := config.Default()
	out, err := r.Run(context.Background(), RunInput{
		Config:              &cfg,
		Transcript:          &schema.Transcript{Segments: []schema.Segment{{ID: 1, Text: "There were gestures at the temple."}}},
		ModuleSpecs:         []contracts.ModuleRunSpec{{ModuleKey: "m", InstanceName: "m"}},
		ValidationLLMClient: client,
	})
	if err != nil {
		t.Fatalf("Run error: %v", err)
	}
	if out.FinalTranscript.Segments[0].Text != "There were gestures at the temple." {
		t.Fatalf("expected rejected proposal not applied")
	}
	if len(out.ModuleResults[0].ValidatorRejected) != 1 {
		t.Fatalf("expected validator rejection record")
	}
}

func TestRunnerLLMValidatorMalformedResponseRejectsBatchAndKeepsPartialProgress(t *testing.T) {
	client := &fakeStructuredClient{responses: []validators.LLMValidationResponse{{Validations: []validators.LLMValidationDecision{{CorrectionIndex: 99, Approved: true, Confidence: 0.9, Reason: "bad index"}}}}}
	llmValidator, _ := validators.NewLLMBackedValidator("spoken_form_plausibility_review", validators.LLMValidatorTypeSpokenFormPlausibility, "")
	r := New(fakeFactory{modules: map[string]contracts.TranscriptModule{
		"m1": fakeModule{key: "m1", policy: proposals.ReplacementPolicyRequireUnique, proposeF: func(req contracts.ProposalRequest) ([]proposals.CorrectionProposal, error) {
			return []proposals.CorrectionProposal{{TargetSegmentID: 1, OriginalText: "teh", CorrectedText: "the", Confidence: 1}}, nil
		}},
		"m2": fakeModule{key: "m2", policy: proposals.ReplacementPolicyRequireUnique, validators: []contracts.Validator{llmValidator}, proposeF: func(req contracts.ProposalRequest) ([]proposals.CorrectionProposal, error) {
			return []proposals.CorrectionProposal{{TargetSegmentID: 1, OriginalText: "cat", CorrectedText: "dog", Confidence: 1}}, nil
		}},
	}})
	cfg := config.Default()
	out, err := r.Run(context.Background(), RunInput{
		Config:              &cfg,
		Transcript:          &schema.Transcript{Segments: []schema.Segment{{ID: 1, Text: "teh cat"}}},
		ModuleSpecs:         []contracts.ModuleRunSpec{{ModuleKey: "m1", InstanceName: "m1"}, {ModuleKey: "m2", InstanceName: "m2"}},
		ValidationLLMClient: client,
	})
	if err != nil {
		t.Fatalf("expected malformed validator response to downgrade, got %v", err)
	}
	if out.FinalTranscript.Segments[0].Text != "the cat" {
		t.Fatalf("expected partial progress retained")
	}
	if len(out.ModuleResults) != 2 || len(out.ModuleResults[1].ValidatorRejected) != 1 {
		t.Fatalf("expected second module rejection, got %+v", out.ModuleResults)
	}
	if len(out.ModuleResults[1].Warnings) != 1 || out.ModuleResults[1].Warnings[0].ReasonCode != validators.ReasonValidatorMalformed {
		t.Fatalf("expected malformed warning, got %+v", out.ModuleResults[1].Warnings)
	}
}

func TestRunnerLLMValidatorMissingDecisionRejectsBatch(t *testing.T) {
	client := &fakeStructuredClient{responses: []validators.LLMValidationResponse{{Validations: []validators.LLMValidationDecision{}}}}
	llmValidator, _ := validators.NewLLMBackedValidator("spoken_form_plausibility_review", validators.LLMValidatorTypeSpokenFormPlausibility, "")
	r := New(fakeFactory{modules: map[string]contracts.TranscriptModule{
		"m": fakeModule{key: "m", policy: proposals.ReplacementPolicyRequireUnique, validators: []contracts.Validator{llmValidator}, proposeF: func(req contracts.ProposalRequest) ([]proposals.CorrectionProposal, error) {
			return []proposals.CorrectionProposal{{TargetSegmentID: 1, OriginalText: "gestures", CorrectedText: "Jesters", Confidence: 1}}, nil
		}},
	}})
	cfg := config.Default()
	_, err := r.Run(context.Background(), RunInput{
		Config:              &cfg,
		Transcript:          &schema.Transcript{Segments: []schema.Segment{{ID: 1, Text: "There were gestures at the temple."}}},
		ModuleSpecs:         []contracts.ModuleRunSpec{{ModuleKey: "m", InstanceName: "m"}},
		ValidationLLMClient: client,
	})
	if err != nil {
		t.Fatalf("expected missing decision downgrade, got %v", err)
	}
}

func TestRunnerLLMValidatorDuplicateDecisionRejectsBatch(t *testing.T) {
	client := &fakeStructuredClient{responses: []validators.LLMValidationResponse{{Validations: []validators.LLMValidationDecision{
		{CorrectionIndex: 0, Approved: true, Confidence: 0.9, Reason: "ok"},
		{CorrectionIndex: 0, Approved: false, Confidence: 0.9, Reason: "dup"},
	}}}}
	llmValidator, _ := validators.NewLLMBackedValidator("spoken_form_plausibility_review", validators.LLMValidatorTypeSpokenFormPlausibility, "")
	r := New(fakeFactory{modules: map[string]contracts.TranscriptModule{
		"m": fakeModule{key: "m", policy: proposals.ReplacementPolicyRequireUnique, validators: []contracts.Validator{llmValidator}, proposeF: func(req contracts.ProposalRequest) ([]proposals.CorrectionProposal, error) {
			return []proposals.CorrectionProposal{{TargetSegmentID: 1, OriginalText: "gestures", CorrectedText: "Jesters", Confidence: 1}}, nil
		}},
	}})
	cfg := config.Default()
	_, err := r.Run(context.Background(), RunInput{
		Config:              &cfg,
		Transcript:          &schema.Transcript{Segments: []schema.Segment{{ID: 1, Text: "There were gestures at the temple."}}},
		ModuleSpecs:         []contracts.ModuleRunSpec{{ModuleKey: "m", InstanceName: "m"}},
		ValidationLLMClient: client,
	})
	if err != nil {
		t.Fatalf("expected duplicate decision downgrade, got %v", err)
	}
}

func TestRunnerLLMValidatorBatchingAndSchedulerUsage(t *testing.T) {
	client := &fakeStructuredClient{responses: []validators.LLMValidationResponse{
		{Validations: []validators.LLMValidationDecision{{CorrectionIndex: 0, Approved: true, Confidence: 0.9, Reason: "ok"}}},
		{Validations: []validators.LLMValidationDecision{{CorrectionIndex: 1, Approved: true, Confidence: 0.9, Reason: "ok"}}},
	}}
	llmValidator, _ := validators.NewLLMBackedValidator("spoken_form_plausibility_review", validators.LLMValidatorTypeSpokenFormPlausibility, "")
	llmValidator.SetTokenEstimator(lenEstimator{})
	scheduler := &countingScheduler{}
	cfg := config.Default()
	cfg.ValidationMaxPromptTokens = 260
	r := New(fakeFactory{modules: map[string]contracts.TranscriptModule{
		"m": fakeModule{key: "m", policy: proposals.ReplacementPolicyReplaceAll, validators: []contracts.Validator{llmValidator}, proposeF: func(req contracts.ProposalRequest) ([]proposals.CorrectionProposal, error) {
			return []proposals.CorrectionProposal{
				{TargetSegmentID: 1, OriginalText: "alpha", CorrectedText: strings.Repeat("B", 40), Confidence: 1},
				{TargetSegmentID: 1, OriginalText: "gamma", CorrectedText: strings.Repeat("D", 40), Confidence: 1},
			}, nil
		}},
	}})
	out, err := r.Run(context.Background(), RunInput{
		Config:                 &cfg,
		Transcript:             &schema.Transcript{Segments: []schema.Segment{{ID: 1, Text: "alpha gamma"}}},
		ModuleSpecs:            []contracts.ModuleRunSpec{{ModuleKey: "m", InstanceName: "m"}},
		ValidationLLMClient:    client,
		ValidationLLMScheduler: scheduler,
	})
	if err != nil {
		t.Fatalf("unexpected run error: %v", err)
	}
	if scheduler.runs < 2 {
		t.Fatalf("expected scheduler to run per batch, got %d", scheduler.runs)
	}
	if client.calls < 2 {
		t.Fatalf("expected multiple llm calls for batching, got %d", client.calls)
	}
	if len(out.ModuleResults[0].AppliedChanges) != 2 {
		t.Fatalf("expected both approved proposals applied")
	}
}

func TestRunnerLLMValidatorDiagnosticsWrittenAndRedacted(t *testing.T) {
	primarySecret := "runner-primary-secret"
	validationSecret := "runner-validation-secret"
	client := &fakeStructuredClient{responses: []validators.LLMValidationResponse{{Validations: []validators.LLMValidationDecision{{CorrectionIndex: 0, Approved: true, Confidence: 0.9, Reason: validationSecret}}}}}
	llmValidator, _ := validators.NewLLMBackedValidator("spoken_form_plausibility_review", validators.LLMValidatorTypeSpokenFormPlausibility, "")
	cfg := config.Default()
	cfg.PrimaryLLM.APIKey = primarySecret
	cfg.ValidationLLM.APIKey = validationSecret
	diagDir := t.TempDir()
	r := New(fakeFactory{modules: map[string]contracts.TranscriptModule{
		"m": fakeModule{key: "m", policy: proposals.ReplacementPolicyRequireUnique, validators: []contracts.Validator{llmValidator}, proposeF: func(req contracts.ProposalRequest) ([]proposals.CorrectionProposal, error) {
			return []proposals.CorrectionProposal{{TargetSegmentID: 1, OriginalText: "gestures", CorrectedText: "Jesters", Confidence: 1}}, nil
		}},
	}})
	out, err := r.Run(context.Background(), RunInput{
		Config:                   &cfg,
		Transcript:               &schema.Transcript{Segments: []schema.Segment{{ID: 1, Text: "There were gestures at the temple. " + primarySecret}}},
		ModuleSpecs:              []contracts.ModuleRunSpec{{ModuleKey: "m", InstanceName: "m"}},
		ValidationLLMClient:      client,
		ValidationDiagnosticsDir: diagDir,
	})
	if err != nil {
		t.Fatalf("Run error: %v", err)
	}
	if len(out.ModuleResults[0].ValidatorDecisions) == 0 || out.ModuleResults[0].ValidatorDecisions[0].DiagnosticArtifactPath == "" {
		t.Fatalf("expected diagnostic artifact path on decision")
	}
	matches, globErr := filepath.Glob(filepath.Join(diagDir, "m", "*.json"))
	if globErr != nil {
		t.Fatalf("glob diagnostics: %v", globErr)
	}
	if len(matches) == 0 {
		t.Fatalf("expected diagnostics JSON artifacts under %s", filepath.Join(diagDir, "m"))
	}
	for _, path := range matches {
		raw, readErr := os.ReadFile(path)
		if readErr != nil {
			t.Fatalf("read diagnostic %q: %v", path, readErr)
		}
		if strings.Contains(string(raw), primarySecret) || strings.Contains(string(raw), validationSecret) {
			t.Fatalf("configured secret leaked in diagnostics %q: %s", path, string(raw))
		}
	}

	raw, readErr := os.ReadFile(out.ModuleResults[0].ValidatorDecisions[0].DiagnosticArtifactPath)
	if readErr != nil {
		t.Fatalf("read decision diagnostic: %v", readErr)
	}
	if !strings.Contains(string(raw), "[REDACTED]") {
		t.Fatalf("expected redaction marker in diagnostics")
	}
}

func TestRunnerAcceptsLLMSchedulerType(t *testing.T) {
	s, err := llm.NewScheduler(1)
	if err != nil {
		t.Fatalf("NewScheduler: %v", err)
	}
	if s == nil {
		t.Fatal("expected scheduler instance")
	}
}

type proposalGenerationModule struct {
	key    string
	policy proposals.ReplacementPolicy
}

func (m proposalGenerationModule) Key() string                                    { return m.key }
func (m proposalGenerationModule) ReplacementPolicy() proposals.ReplacementPolicy { return m.policy }
func (m proposalGenerationModule) Validators() []contracts.Validator              { return nil }
func (m proposalGenerationModule) Propose(ctx context.Context, req contracts.ProposalRequest) (contracts.ProposalResult, error) {
	result, err := proposal_generation.GenerateCandidates(ctx, proposal_generation.Request{
		ModuleKey:         req.RunSpec.ModuleKey,
		ModuleInstance:    req.RunSpec.InstanceName,
		ReplacementPolicy: req.RunSpec.ReplacementPolicy,
		WorkingTranscript: req.WorkingTranscript,
		Config:            req.Config,
		Glossary:          req.Glossary,
		Messages: []contracts.LLMMessage{
			{Role: "system", Content: "return transcript corrections"},
			{Role: "user", Content: "produce one safe correction"},
		},
		LLMClient:      req.LLMClient,
		Scheduler:      req.LLMScheduler,
		DiagnosticsDir: req.DiagnosticsDir,
	})
	if err != nil {
		return contracts.ProposalResult{}, err
	}
	return contracts.ProposalResult{Proposals: result.Corrections, Warnings: result.Warnings}, nil
}

type fakeProposalStructuredClient struct {
	responses []proposal_generation.StructuredCorrectionSet
}

func (f *fakeProposalStructuredClient) CompleteStructured(ctx context.Context, req contracts.StructuredCompletionRequest, out any) (contracts.StructuredCompletionResponse, error) {
	_ = ctx
	_ = req
	if len(f.responses) == 0 {
		return contracts.StructuredCompletionResponse{}, errors.New("unexpected call")
	}
	target, ok := out.(*proposal_generation.StructuredCorrectionSet)
	if !ok {
		return contracts.StructuredCompletionResponse{}, errors.New("unexpected output type")
	}
	*target = f.responses[0]
	f.responses = f.responses[1:]
	return contracts.StructuredCompletionResponse{}, nil
}

func TestRunnerProposalGenerationHelperFlowsThroughPipeline(t *testing.T) {
	client := &fakeProposalStructuredClient{
		responses: []proposal_generation.StructuredCorrectionSet{
			{
				Corrections: []proposal_generation.StructuredCorrectionProposal{
					{TargetSegmentID: 1, OriginalText: "teh", CorrectedText: "the", Confidence: 0.9},
				},
			},
		},
	}
	scheduler := &countingScheduler{}
	cfg := config.Default()
	diagDir := t.TempDir()

	r := New(fakeFactory{modules: map[string]contracts.TranscriptModule{
		"m": proposalGenerationModule{key: "m", policy: proposals.ReplacementPolicyRequireUnique},
	}})

	out, err := r.Run(context.Background(), RunInput{
		Config:                 &cfg,
		Transcript:             &schema.Transcript{Segments: []schema.Segment{{ID: 1, Text: "teh cat"}}},
		ModuleSpecs:            []contracts.ModuleRunSpec{{ModuleKey: "m", InstanceName: "m"}},
		ProposalLLMClient:      client,
		ProposalLLMScheduler:   scheduler,
		ProposalDiagnosticsDir: diagDir,
	})
	if err != nil {
		t.Fatalf("unexpected run error: %v", err)
	}
	if out.FinalTranscript.Segments[0].Text != "the cat" {
		t.Fatalf("expected proposal-generated correction to apply, got %q", out.FinalTranscript.Segments[0].Text)
	}
	if scheduler.runs != 1 {
		t.Fatalf("expected proposal scheduler use, got %d runs", scheduler.runs)
	}
	if len(out.ModuleResults) != 1 || len(out.ModuleResults[0].AppliedChanges) != 1 {
		t.Fatalf("expected one applied change, got %+v", out.ModuleResults)
	}
	matches, globErr := filepath.Glob(filepath.Join(diagDir, "m", "*proposal-generation*response-payload.json"))
	if globErr != nil {
		t.Fatalf("glob diagnostics: %v", globErr)
	}
	if len(matches) == 0 {
		t.Fatalf("expected proposal-generation diagnostics artifacts in %s", filepath.Join(diagDir, "m"))
	}
}

func TestRunnerGrammarModuleUsesConfidenceThreshold(t *testing.T) {
	client := &fakeProposalStructuredClient{
		responses: []proposal_generation.StructuredCorrectionSet{
			{
				Corrections: []proposal_generation.StructuredCorrectionProposal{
					{TargetSegmentID: 1, OriginalText: "hello ,world", CorrectedText: "Hello, world", Confidence: 0.5},
				},
			},
		},
	}
	cfg := config.Default()
	cfg.Thresholds.Grammar = 0.9
	factory := modules.NewFactory(modules.Dependencies{})
	out, err := New(factory).Run(context.Background(), RunInput{
		Config:            &cfg,
		Transcript:        &schema.Transcript{Segments: []schema.Segment{{ID: 1, Text: "hello ,world"}}},
		Glossary:          &schema.Glossary{},
		ModuleSpecs:       []contracts.ModuleRunSpec{{ModuleKey: "grammar", InstanceName: "grammar"}},
		ProposalLLMClient: client,
	})
	if err != nil {
		t.Fatalf("Run error: %v", err)
	}
	if out.FinalTranscript.Segments[0].Text != "hello ,world" {
		t.Fatalf("expected no changes due to confidence threshold, got %q", out.FinalTranscript.Segments[0].Text)
	}
	if len(out.ModuleResults) != 1 || len(out.ModuleResults[0].ValidatorRejected) == 0 {
		t.Fatalf("expected validator rejection, got %+v", out.ModuleResults)
	}
	if out.ModuleResults[0].ValidatorRejected[0].ReasonCode != validators.ReasonLowConfidence {
		t.Fatalf("expected low confidence reason, got %+v", out.ModuleResults[0].ValidatorRejected[0])
	}
}

func TestRunnerGlossaryModuleUsesConfidenceThreshold(t *testing.T) {
	client := &fakeProposalStructuredClient{
		responses: []proposal_generation.StructuredCorrectionSet{
			{
				Corrections: []proposal_generation.StructuredCorrectionProposal{
					{TargetSegmentID: 1, OriginalText: "gestures", CorrectedText: "Jesters", Confidence: 0.5},
				},
			},
		},
	}
	cfg := config.Default()
	cfg.Thresholds.Glossary = 0.9
	factory := modules.NewFactory(modules.Dependencies{})
	out, err := New(factory).Run(context.Background(), RunInput{
		Config:            &cfg,
		Transcript:        &schema.Transcript{Segments: []schema.Segment{{ID: 1, Text: "There were gestures"}}},
		Glossary:          &schema.Glossary{Entries: []schema.GlossaryEntry{{Name: "Jesters", Category: "faction", Summary: "Faction"}}},
		ModuleSpecs:       []contracts.ModuleRunSpec{{ModuleKey: "glossary", InstanceName: "glossary"}},
		ProposalLLMClient: client,
	})
	if err != nil {
		t.Fatalf("Run error: %v", err)
	}
	if out.FinalTranscript.Segments[0].Text != "There were gestures" {
		t.Fatalf("expected no changes due to glossary confidence threshold, got %q", out.FinalTranscript.Segments[0].Text)
	}
	if len(out.ModuleResults) != 1 || len(out.ModuleResults[0].ValidatorRejected) == 0 {
		t.Fatalf("expected validator rejection, got %+v", out.ModuleResults)
	}
	if out.ModuleResults[0].ValidatorRejected[0].ReasonCode != validators.ReasonLowConfidence {
		t.Fatalf("expected low confidence reason, got %+v", out.ModuleResults[0].ValidatorRejected[0])
	}
}