fm-rds-tx/internal/control/control_test.go

package control

import (
	"bytes"
	"encoding/json"
	"errors"
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"

	cfgpkg "github.com/jan/fm-rds-tx/internal/config"
	"github.com/jan/fm-rds-tx/internal/output"
)

func TestHealthz(t *testing.T) {
	srv := NewServer(cfgpkg.Default())
	rec := httptest.NewRecorder()
	srv.Handler().ServeHTTP(rec, httptest.NewRequest(http.MethodGet, "/healthz", nil))
	if rec.Code != 200 {
		t.Fatalf("status: %d", rec.Code)
	}
}

func TestStatus(t *testing.T) {
	srv := NewServer(cfgpkg.Default())
	rec := httptest.NewRecorder()
	srv.Handler().ServeHTTP(rec, httptest.NewRequest(http.MethodGet, "/status", nil))
	if rec.Code != 200 {
		t.Fatalf("status: %d", rec.Code)
	}
	var body map[string]any
	json.Unmarshal(rec.Body.Bytes(), &body)
	if body["service"] != "fm-rds-tx" {
		t.Fatal("missing service")
	}
	if _, ok := body["preEmphasisTauUS"]; !ok {
		t.Fatal("missing preEmphasisTauUS")
	}
}

func TestStatusReportsRuntimeIndicator(t *testing.T) {
	srv := NewServer(cfgpkg.Default())
	srv.SetTXController(&fakeTXController{stats: map[string]any{"runtimeIndicator": "degraded", "runtimeAlert": "late buffers"}})
	rec := httptest.NewRecorder()
	srv.Handler().ServeHTTP(rec, httptest.NewRequest(http.MethodGet, "/status", nil))
	if rec.Code != 200 {
		t.Fatalf("status: %d", rec.Code)
	}
	var body map[string]any
	json.Unmarshal(rec.Body.Bytes(), &body)
	if body["runtimeIndicator"] != "degraded" {
		t.Fatalf("expected runtimeIndicator degraded, got %v", body["runtimeIndicator"])
	}
	if body["runtimeAlert"] != "late buffers" {
		t.Fatalf("expected runtimeAlert late buffers, got %v", body["runtimeAlert"])
	}
}

func TestStatusReportsQueueStats(t *testing.T) {
	cfg := cfgpkg.Default()
	queueStats := output.QueueStats{
		Capacity:  cfg.Runtime.FrameQueueCapacity,
		Depth:     1,
		FillLevel: 0.25,
		Health:    output.QueueHealthLow,
	}
	srv := NewServer(cfg)
	srv.SetTXController(&fakeTXController{stats: map[string]any{"queue": queueStats}})
	rec := httptest.NewRecorder()
	srv.Handler().ServeHTTP(rec, httptest.NewRequest(http.MethodGet, "/status", nil))
	if rec.Code != 200 {
		t.Fatalf("status: %d", rec.Code)
	}
	var body map[string]any
	if err := json.Unmarshal(rec.Body.Bytes(), &body); err != nil {
		t.Fatalf("unmarshal queue stats: %v", err)
	}
	queueRaw, ok := body["queue"]
	if !ok {
		t.Fatalf("missing queue in status")
	}
	queueMap, ok := queueRaw.(map[string]any)
	if !ok {
		t.Fatalf("queue stats type mismatch: %T", queueRaw)
	}
	if queueMap["capacity"] != float64(queueStats.Capacity) {
		t.Fatalf("queue capacity mismatch: want %v got %v", queueStats.Capacity, queueMap["capacity"])
	}
	if queueMap["health"] != string(queueStats.Health) {
		t.Fatalf("queue health mismatch: want %s got %v", queueStats.Health, queueMap["health"])
	}
}

func TestStatusReportsRuntimeState(t *testing.T) {
	srv := NewServer(cfgpkg.Default())
	srv.SetTXController(&fakeTXController{stats: map[string]any{"state": "faulted"}})
	rec := httptest.NewRecorder()
	srv.Handler().ServeHTTP(rec, httptest.NewRequest(http.MethodGet, "/status", nil))
	if rec.Code != 200 {
		t.Fatalf("status: %d", rec.Code)
	}
	var body map[string]any
	if err := json.Unmarshal(rec.Body.Bytes(), &body); err != nil {
		t.Fatalf("unmarshal runtime state: %v", err)
	}
	if body["runtimeState"] != "faulted" {
		t.Fatalf("expected runtimeState faulted, got %v", body["runtimeState"])
	}
}

func TestDryRunEndpoint(t *testing.T) {
	srv := NewServer(cfgpkg.Default())
	rec := httptest.NewRecorder()
	srv.Handler().ServeHTTP(rec, httptest.NewRequest(http.MethodGet, "/dry-run", nil))
	if rec.Code != 200 {
		t.Fatalf("status: %d", rec.Code)
	}
	var body map[string]any
	json.Unmarshal(rec.Body.Bytes(), &body)
	if body["mode"] != "dry-run" {
		t.Fatal("wrong mode")
	}
}

func TestConfigPatch(t *testing.T) {
	srv := NewServer(cfgpkg.Default())
	body := []byte(`{"toneLeftHz":900,"radioText":"hello world","preEmphasisTauUS":75}`)
	rec := httptest.NewRecorder()
	srv.Handler().ServeHTTP(rec, newConfigPostRequest(body))
	if rec.Code != 200 {
		t.Fatalf("status: %d body=%s", rec.Code, rec.Body.String())
	}
}

func TestConfigPatchRejectsOversizeBody(t *testing.T) {
	srv := NewServer(cfgpkg.Default())
	rec := httptest.NewRecorder()
	payload := bytes.Repeat([]byte("x"), maxConfigBodyBytes+32)
	body := append([]byte(`{"ps":"`), payload...)
	body = append(body, []byte(`"}`)...)
	req := newConfigPostRequest(body)
	srv.Handler().ServeHTTP(rec, req)
	if rec.Code != http.StatusRequestEntityTooLarge {
		t.Fatalf("expected 413, got %d response=%q", rec.Code, rec.Body.String())
	}
}

func TestConfigPatchRejectsMissingContentType(t *testing.T) {
	srv := NewServer(cfgpkg.Default())
	rec := httptest.NewRecorder()
	req := httptest.NewRequest(http.MethodPost, "/config", bytes.NewReader([]byte(`{}`)))
	srv.Handler().ServeHTTP(rec, req)
	if rec.Code != http.StatusUnsupportedMediaType {
		t.Fatalf("expected 415 when Content-Type missing, got %d", rec.Code)
	}
}

func TestConfigPatchRejectsNonJSONContentType(t *testing.T) {
	srv := NewServer(cfgpkg.Default())
	rec := httptest.NewRecorder()
	req := httptest.NewRequest(http.MethodPost, "/config", bytes.NewReader([]byte(`{}`)))
	req.Header.Set("Content-Type", "text/plain")
	srv.Handler().ServeHTTP(rec, req)
	if rec.Code != http.StatusUnsupportedMediaType {
		t.Fatalf("expected 415 for non-JSON Content-Type, got %d", rec.Code)
	}
}

func TestRuntimeWithoutDriver(t *testing.T) {
	srv := NewServer(cfgpkg.Default())
	rec := httptest.NewRecorder()
	srv.Handler().ServeHTTP(rec, httptest.NewRequest(http.MethodGet, "/runtime", nil))
	if rec.Code != 200 {
		t.Fatalf("status: %d", rec.Code)
	}
}

func TestRuntimeReportsFaultHistory(t *testing.T) {
	srv := NewServer(cfgpkg.Default())
	history := []map[string]any{
		{
			"time":     "2026-04-06T00:00:00Z",
			"reason":   "queueCritical",
			"severity": "faulted",
			"message":  "queue critical",
		},
	}
	srv.SetTXController(&fakeTXController{stats: map[string]any{"faultHistory": history}})
	rec := httptest.NewRecorder()
	srv.Handler().ServeHTTP(rec, httptest.NewRequest(http.MethodGet, "/runtime", nil))
	if rec.Code != 200 {
		t.Fatalf("status: %d", rec.Code)
	}
	var body map[string]any
	if err := json.Unmarshal(rec.Body.Bytes(), &body); err != nil {
		t.Fatalf("unmarshal runtime: %v", err)
	}
	engineRaw, ok := body["engine"].(map[string]any)
	if !ok {
		t.Fatalf("runtime engine missing")
	}
	histRaw, ok := engineRaw["faultHistory"].([]any)
	if !ok {
		t.Fatalf("faultHistory missing or wrong type: %T", engineRaw["faultHistory"])
	}
	if len(histRaw) != len(history) {
		t.Fatalf("faultHistory length mismatch: want %d got %d", len(history), len(histRaw))
	}
}
func TestRuntimeReportsTransitionHistory(t *testing.T) {
	srv := NewServer(cfgpkg.Default())
	history := []map[string]any{{
		"time":     "2026-04-06T00:00:00Z",
		"from":     "running",
		"to":       "degraded",
		"severity": "warn",
	}}
	srv.SetTXController(&fakeTXController{stats: map[string]any{"transitionHistory": history}})
	rec := httptest.NewRecorder()
	srv.Handler().ServeHTTP(rec, httptest.NewRequest(http.MethodGet, "/runtime", nil))
	if rec.Code != 200 {
		t.Fatalf("status: %d", rec.Code)
	}
	var body map[string]any
	if err := json.Unmarshal(rec.Body.Bytes(), &body); err != nil {
		t.Fatalf("unmarshal runtime: %v", err)
	}
	engineRaw, ok := body["engine"].(map[string]any)
	if !ok {
		t.Fatalf("runtime engine missing")
	}
	histRaw, ok := engineRaw["transitionHistory"].([]any)
	if !ok {
		t.Fatalf("transitionHistory missing or wrong type: %T", engineRaw["transitionHistory"])
	}
	if len(histRaw) != len(history) {
		t.Fatalf("transitionHistory length mismatch: want %d got %d", len(history), len(histRaw))
	}
}

func TestRuntimeFaultResetRejectsGet(t *testing.T) {
	srv := NewServer(cfgpkg.Default())
	rec := httptest.NewRecorder()
	req := httptest.NewRequest(http.MethodGet, "/runtime/fault/reset", nil)
	srv.Handler().ServeHTTP(rec, req)
	if rec.Code != http.StatusMethodNotAllowed {
		t.Fatalf("expected 405 for fault reset GET, got %d", rec.Code)
	}
}

func TestRuntimeFaultResetRequiresController(t *testing.T) {
	srv := NewServer(cfgpkg.Default())
	rec := httptest.NewRecorder()
	req := httptest.NewRequest(http.MethodPost, "/runtime/fault/reset", nil)
	srv.Handler().ServeHTTP(rec, req)
	if rec.Code != http.StatusServiceUnavailable {
		t.Fatalf("expected 503 without controller, got %d", rec.Code)
	}
}

func TestRuntimeFaultResetControllerError(t *testing.T) {
	srv := NewServer(cfgpkg.Default())
	srv.SetTXController(&fakeTXController{resetErr: errors.New("boom")})
	rec := httptest.NewRecorder()
	req := httptest.NewRequest(http.MethodPost, "/runtime/fault/reset", nil)
	srv.Handler().ServeHTTP(rec, req)
	if rec.Code != http.StatusConflict {
		t.Fatalf("expected 409 when controller rejects, got %d", rec.Code)
	}
}

func TestRuntimeFaultResetSuccess(t *testing.T) {
	srv := NewServer(cfgpkg.Default())
	srv.SetTXController(&fakeTXController{})
	rec := httptest.NewRecorder()
	req := httptest.NewRequest(http.MethodPost, "/runtime/fault/reset", nil)
	srv.Handler().ServeHTTP(rec, req)
	if rec.Code != 200 {
		t.Fatalf("expected 200 on success, got %d", rec.Code)
	}
	var body map[string]any
	if err := json.Unmarshal(rec.Body.Bytes(), &body); err != nil {
		t.Fatalf("unmarshal response: %v", err)
	}
	if ok, _ := body["ok"].(bool); !ok {
		t.Fatalf("expected ok true, got %v", body["ok"])
	}
}

func TestRuntimeFaultResetRejectsBody(t *testing.T) {
	srv := NewServer(cfgpkg.Default())
	srv.SetTXController(&fakeTXController{})
	rec := httptest.NewRecorder()
	req := httptest.NewRequest(http.MethodPost, "/runtime/fault/reset", bytes.NewReader([]byte("nope")))
	srv.Handler().ServeHTTP(rec, req)
	if rec.Code != http.StatusBadRequest {
		t.Fatalf("expected 400 when body present, got %d", rec.Code)
	}
	if !strings.Contains(rec.Body.String(), "request must not include a body") {
		t.Fatalf("unexpected response body: %q", rec.Body.String())
	}
}

func TestAudioStreamRequiresSource(t *testing.T) {
	srv := NewServer(cfgpkg.Default())
	rec := httptest.NewRecorder()
	req := httptest.NewRequest(http.MethodPost, "/audio/stream", bytes.NewReader(nil))
	req.Header.Set("Content-Type", "application/octet-stream")
	srv.Handler().ServeHTTP(rec, req)
	if rec.Code != http.StatusServiceUnavailable {
		t.Fatalf("expected 503 when audio stream missing, got %d", rec.Code)
	}
}

func TestAudioStreamPushesPCM(t *testing.T) {
	cfg := cfgpkg.Default()
	srv := NewServer(cfg)
	ingress := &fakeAudioIngress{}
	srv.SetAudioIngress(ingress)
	pcm := []byte{0, 0, 0, 0}
	rec := httptest.NewRecorder()
	req := httptest.NewRequest(http.MethodPost, "/audio/stream", bytes.NewReader(pcm))
	req.Header.Set("Content-Type", "application/octet-stream")
	srv.Handler().ServeHTTP(rec, req)
	if rec.Code != 200 {
		t.Fatalf("expected 200, got %d", rec.Code)
	}
	var body map[string]any
	if err := json.Unmarshal(rec.Body.Bytes(), &body); err != nil {
		t.Fatalf("unmarshal response: %v", err)
	}
	if ok, _ := body["ok"].(bool); !ok {
		t.Fatalf("expected ok true, got %v", body["ok"])
	}
	frames, _ := body["frames"].(float64)
	if frames != 1 {
		t.Fatalf("expected 1 frame, got %v", frames)
	}
	if ingress.totalFrames != 1 {
		t.Fatalf("expected ingress frames=1, got %d", ingress.totalFrames)
	}
}

func TestAudioStreamRejectsNonPost(t *testing.T) {
	srv := NewServer(cfgpkg.Default())
	rec := httptest.NewRecorder()
	req := httptest.NewRequest(http.MethodGet, "/audio/stream", nil)
	srv.Handler().ServeHTTP(rec, req)
	if rec.Code != http.StatusMethodNotAllowed {
		t.Fatalf("expected 405 for audio stream GET, got %d", rec.Code)
	}
}

func TestAudioStreamRejectsMissingContentType(t *testing.T) {
	cfg := cfgpkg.Default()
	srv := NewServer(cfg)
	srv.SetAudioIngress(&fakeAudioIngress{})
	rec := httptest.NewRecorder()
	req := httptest.NewRequest(http.MethodPost, "/audio/stream", bytes.NewReader([]byte{0, 0}))
	srv.Handler().ServeHTTP(rec, req)
	if rec.Code != http.StatusUnsupportedMediaType {
		t.Fatalf("expected 415 when Content-Type missing, got %d", rec.Code)
	}
	if !strings.Contains(rec.Body.String(), "Content-Type must be") {
		t.Fatalf("unexpected response body: %q", rec.Body.String())
	}
}

func TestAudioStreamRejectsUnsupportedContentType(t *testing.T) {
	cfg := cfgpkg.Default()
	srv := NewServer(cfg)
	srv.SetAudioIngress(&fakeAudioIngress{})
	rec := httptest.NewRecorder()
	req := httptest.NewRequest(http.MethodPost, "/audio/stream", bytes.NewReader([]byte{0, 0}))
	req.Header.Set("Content-Type", "text/plain")
	srv.Handler().ServeHTTP(rec, req)
	if rec.Code != http.StatusUnsupportedMediaType {
		t.Fatalf("expected 415 for unsupported Content-Type, got %d", rec.Code)
	}
	if !strings.Contains(rec.Body.String(), "Content-Type must be") {
		t.Fatalf("unexpected response body: %q", rec.Body.String())
	}
}

func TestAudioStreamRejectsBodyTooLarge(t *testing.T) {
	orig := audioStreamBodyLimit
	t.Cleanup(func() {
		audioStreamBodyLimit = orig
	})
	audioStreamBodyLimit = 1024
	limit := int(audioStreamBodyLimit)
	body := make([]byte, limit+1)
	srv := NewServer(cfgpkg.Default())
	srv.SetAudioIngress(&fakeAudioIngress{})
	rec := httptest.NewRecorder()
	req := httptest.NewRequest(http.MethodPost, "/audio/stream", bytes.NewReader(body))
	req.Header.Set("Content-Type", "application/octet-stream")
	srv.Handler().ServeHTTP(rec, req)
	if rec.Code != http.StatusRequestEntityTooLarge {
		t.Fatalf("expected 413 for oversized body, got %d", rec.Code)
	}
	if !strings.Contains(rec.Body.String(), "request body too large") {
		t.Fatalf("unexpected response body: %q", rec.Body.String())
	}
}

func TestTXStartWithoutController(t *testing.T) {
	srv := NewServer(cfgpkg.Default())
	rec := httptest.NewRecorder()
	srv.Handler().ServeHTTP(rec, httptest.NewRequest(http.MethodPost, "/tx/start", nil))
	if rec.Code != http.StatusServiceUnavailable {
		t.Fatalf("expected 503, got %d", rec.Code)
	}
}

func TestTXStartRejectsBody(t *testing.T) {
	srv := NewServer(cfgpkg.Default())
	srv.SetTXController(&fakeTXController{})
	rec := httptest.NewRecorder()
	req := httptest.NewRequest(http.MethodPost, "/tx/start", bytes.NewReader([]byte("body")))
	srv.Handler().ServeHTTP(rec, req)
	if rec.Code != http.StatusBadRequest {
		t.Fatalf("expected 400 when body present, got %d", rec.Code)
	}
	if !strings.Contains(rec.Body.String(), "request must not include a body") {
		t.Fatalf("unexpected response body: %q", rec.Body.String())
	}
}

func TestTXStopRejectsBody(t *testing.T) {
	srv := NewServer(cfgpkg.Default())
	srv.SetTXController(&fakeTXController{})
	rec := httptest.NewRecorder()
	req := httptest.NewRequest(http.MethodPost, "/tx/stop", bytes.NewReader([]byte("body")))
	srv.Handler().ServeHTTP(rec, req)
	if rec.Code != http.StatusBadRequest {
		t.Fatalf("expected 400 when body present, got %d", rec.Code)
	}
	if !strings.Contains(rec.Body.String(), "request must not include a body") {
		t.Fatalf("unexpected response body: %q", rec.Body.String())
	}
}

func TestConfigPatchUpdatesSnapshot(t *testing.T) {
	srv := NewServer(cfgpkg.Default())
	srv.SetTXController(&fakeTXController{})

	rec := httptest.NewRecorder()
	body := []byte(`{"outputDrive":1.2}`)
	srv.Handler().ServeHTTP(rec, newConfigPostRequest(body))
	if rec.Code != 200 {
		t.Fatalf("status: %d", rec.Code)
	}
	var resp map[string]any
	if err := json.Unmarshal(rec.Body.Bytes(), &resp); err != nil {
		t.Fatalf("unmarshal response: %v", err)
	}
	if live, ok := resp["live"].(bool); !ok || !live {
		t.Fatalf("expected live true, got %v", resp["live"])
	}

	rec = httptest.NewRecorder()
	srv.Handler().ServeHTTP(rec, httptest.NewRequest(http.MethodGet, "/config", nil))
	var cfg cfgpkg.Config
	if err := json.NewDecoder(rec.Body).Decode(&cfg); err != nil {
		t.Fatalf("decode config: %v", err)
	}
	if cfg.FM.OutputDrive != 1.2 {
		t.Fatalf("expected snapshot to reflect new drive, got %v", cfg.FM.OutputDrive)
	}
}

func TestConfigPatchEngineRejectsDoesNotUpdateSnapshot(t *testing.T) {
	srv := NewServer(cfgpkg.Default())
	srv.SetTXController(&fakeTXController{updateErr: errors.New("boom")})

	body := []byte(`{"outputDrive":2.2}`)
	rec := httptest.NewRecorder()
	srv.Handler().ServeHTTP(rec, newConfigPostRequest(body))
	if rec.Code != http.StatusBadRequest {
		t.Fatalf("expected 400, got %d", rec.Code)
	}

	rec = httptest.NewRecorder()
	srv.Handler().ServeHTTP(rec, httptest.NewRequest(http.MethodGet, "/config", nil))
	var cfg cfgpkg.Config
	if err := json.NewDecoder(rec.Body).Decode(&cfg); err != nil {
		t.Fatalf("decode config: %v", err)
	}
	if cfg.FM.OutputDrive != cfgpkg.Default().FM.OutputDrive {
		t.Fatalf("expected snapshot untouched, got %v", cfg.FM.OutputDrive)
	}
}

func TestRuntimeIncludesControlAudit(t *testing.T) {
	srv := NewServer(cfgpkg.Default())
	counts := controlAuditCounts(t, srv)
	keys := []string{"methodNotAllowed", "unsupportedMediaType", "bodyTooLarge", "unexpectedBody"}
	for _, key := range keys {
		if counts[key] != 0 {
			t.Fatalf("expected %s to start at 0, got %d", key, counts[key])
		}
	}
}

func TestControlAuditTracksMethodNotAllowed(t *testing.T) {
	srv := NewServer(cfgpkg.Default())
	rec := httptest.NewRecorder()
	srv.Handler().ServeHTTP(rec, httptest.NewRequest(http.MethodGet, "/audio/stream", nil))
	if rec.Code != http.StatusMethodNotAllowed {
		t.Fatalf("expected 405 from audio stream GET, got %d", rec.Code)
	}
	counts := controlAuditCounts(t, srv)
	if counts["methodNotAllowed"] != 1 {
		t.Fatalf("expected methodNotAllowed=1, got %d", counts["methodNotAllowed"])
	}
}

func TestControlAuditTracksUnsupportedMediaType(t *testing.T) {
	srv := NewServer(cfgpkg.Default())
	srv.SetAudioIngress(&fakeAudioIngress{})
	rec := httptest.NewRecorder()
	req := httptest.NewRequest(http.MethodPost, "/audio/stream", bytes.NewReader([]byte{0, 0}))
	srv.Handler().ServeHTTP(rec, req)
	if rec.Code != http.StatusUnsupportedMediaType {
		t.Fatalf("expected 415 for audio stream content type, got %d", rec.Code)
	}
	counts := controlAuditCounts(t, srv)
	if counts["unsupportedMediaType"] != 1 {
		t.Fatalf("expected unsupportedMediaType=1, got %d", counts["unsupportedMediaType"])
	}
}

func TestControlAuditTracksBodyTooLarge(t *testing.T) {
	srv := NewServer(cfgpkg.Default())
	limit := int(maxConfigBodyBytes)
	body := []byte("{\"ps\":\"" + strings.Repeat("x", limit+1) + "\"}")
	rec := httptest.NewRecorder()
	srv.Handler().ServeHTTP(rec, newConfigPostRequest(body))
	if rec.Code != http.StatusRequestEntityTooLarge {
		t.Fatalf("expected 413 for oversized config body, got %d", rec.Code)
	}
	counts := controlAuditCounts(t, srv)
	if counts["bodyTooLarge"] != 1 {
		t.Fatalf("expected bodyTooLarge=1, got %d", counts["bodyTooLarge"])
	}
}

func TestControlAuditTracksUnexpectedBody(t *testing.T) {
	srv := NewServer(cfgpkg.Default())
	srv.SetTXController(&fakeTXController{})
	rec := httptest.NewRecorder()
	req := httptest.NewRequest(http.MethodPost, "/tx/start", bytes.NewReader([]byte("body")))
	srv.Handler().ServeHTTP(rec, req)
	if rec.Code != http.StatusBadRequest {
		t.Fatalf("expected 400 for unexpected body, got %d", rec.Code)
	}
	counts := controlAuditCounts(t, srv)
	if counts["unexpectedBody"] != 1 {
		t.Fatalf("expected unexpectedBody=1, got %d", counts["unexpectedBody"])
	}
}

func controlAuditCounts(t *testing.T, srv *Server) map[string]uint64 {
	t.Helper()
	rec := httptest.NewRecorder()
	srv.Handler().ServeHTTP(rec, httptest.NewRequest(http.MethodGet, "/runtime", nil))
	if rec.Code != http.StatusOK {
		t.Fatalf("runtime request failed: %d", rec.Code)
	}
	var payload map[string]any
	if err := json.Unmarshal(rec.Body.Bytes(), &payload); err != nil {
		t.Fatalf("unmarshal runtime: %v", err)
	}
	raw, ok := payload["controlAudit"].(map[string]any)
	if !ok {
		t.Fatalf("controlAudit missing or wrong type: %T", payload["controlAudit"])
	}
	counts := map[string]uint64{}
	for key, value := range raw {
		num, ok := value.(float64)
		if !ok {
			t.Fatalf("controlAudit %s not numeric: %T", key, value)
		}
		counts[key] = uint64(num)
	}
	return counts
}

func newConfigPostRequest(body []byte) *http.Request {
	req := httptest.NewRequest(http.MethodPost, "/config", bytes.NewReader(body))
	req.Header.Set("Content-Type", "application/json")
	return req
}

type fakeTXController struct {
	updateErr error
	resetErr  error
	stats     map[string]any
}

type fakeAudioIngress struct {
	totalFrames int
}

func (f *fakeAudioIngress) WritePCM16(data []byte) (int, error) {
	frames := len(data) / 4
	f.totalFrames += frames
	return frames, nil
}

func (f *fakeTXController) StartTX() error { return nil }
func (f *fakeTXController) StopTX() error  { return nil }
func (f *fakeTXController) TXStats() map[string]any {
	if f.stats != nil {
		return f.stats
	}
	return map[string]any{}
}
func (f *fakeTXController) UpdateConfig(_ LivePatch) error { return f.updateErr }
func (f *fakeTXController) ResetFault() error              { return f.resetErr }