package api

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

	"github.com/google/uuid"

	"github.com/vasyakrg/dns-autoresolver/internal/diff"
	"github.com/vasyakrg/dns-autoresolver/internal/model"
	"github.com/vasyakrg/dns-autoresolver/internal/provider"
	"github.com/vasyakrg/dns-autoresolver/internal/store"
	"github.com/vasyakrg/dns-autoresolver/internal/store/dto"
)

const testPID = "00000000-0000-0000-0000-000000000002"

// --- mocks ---

type mockTenantStore struct {
	accounts       []store.Account
	createAccounts []struct{ provider, secretEnc, comment string }

	templates      []store.Template
	createTemplate *store.Template

	domains       []store.Domain
	createDomains int

	importDomains    []store.Domain
	importDomainsErr error
	importCalled     bool

	setDomainTemplateErr error
}

func (m *mockTenantStore) CreateAccount(_ context.Context, projectID uuid.UUID, prov, secretEnc, comment string) (store.Account, error) {
	m.createAccounts = append(m.createAccounts, struct{ provider, secretEnc, comment string }{prov, secretEnc, comment})
	acc := store.Account{ID: uuid.New(), ProjectID: projectID, Provider: prov, SecretEnc: secretEnc, Comment: comment}
	m.accounts = append(m.accounts, acc)
	return acc, nil
}

func (m *mockTenantStore) ListAccounts(context.Context, uuid.UUID) ([]store.Account, error) {
	return m.accounts, nil
}

func (m *mockTenantStore) GetAccount(_ context.Context, id, _ uuid.UUID) (store.Account, error) {
	for _, a := range m.accounts {
		if a.ID == id {
			return a, nil
		}
	}
	return store.Account{}, errors.New("account not found")
}

func (m *mockTenantStore) DeleteAccount(context.Context, uuid.UUID, uuid.UUID) error { return nil }

func (m *mockTenantStore) CreateTemplate(_ context.Context, projectID uuid.UUID, name string, doc dto.TemplateDoc) (store.Template, error) {
	tpl := store.Template{ID: uuid.New(), ProjectID: projectID, Name: name, Doc: doc, Version: 1}
	m.createTemplate = &tpl
	m.templates = append(m.templates, tpl)
	return tpl, nil
}

func (m *mockTenantStore) ListTemplates(context.Context, uuid.UUID) ([]store.Template, error) {
	return m.templates, nil
}

func (m *mockTenantStore) UpdateTemplate(_ context.Context, id, projectID uuid.UUID, name string, doc dto.TemplateDoc) (store.Template, error) {
	return store.Template{ID: id, ProjectID: projectID, Name: name, Doc: doc, Version: 2}, nil
}

func (m *mockTenantStore) DeleteTemplate(context.Context, uuid.UUID, uuid.UUID) error { return nil }

func (m *mockTenantStore) GetTemplate(_ context.Context, id, _ uuid.UUID) (store.Template, error) {
	for _, t := range m.templates {
		if t.ID == id {
			return t, nil
		}
	}
	return store.Template{}, errors.New("template not found")
}

func (m *mockTenantStore) CreateDomain(_ context.Context, projectID, accountID uuid.UUID, zoneName, zoneID string, templateID *uuid.UUID) (store.Domain, error) {
	m.createDomains++
	d := store.Domain{ID: uuid.New(), ProjectID: projectID, ProviderAccountID: accountID, ZoneName: zoneName, ZoneID: zoneID, TemplateID: templateID}
	m.domains = append(m.domains, d)
	return d, nil
}

func (m *mockTenantStore) ListDomains(context.Context, uuid.UUID) ([]store.Domain, error) {
	return m.domains, nil
}

func (m *mockTenantStore) DeleteDomain(context.Context, uuid.UUID, uuid.UUID) error { return nil }

func (m *mockTenantStore) SetDomainTemplate(_ context.Context, domainID, projectID uuid.UUID, templateID *uuid.UUID) (store.Domain, error) {
	if m.setDomainTemplateErr != nil {
		return store.Domain{}, m.setDomainTemplateErr
	}
	for i, d := range m.domains {
		if d.ID == domainID {
			m.domains[i].TemplateID = templateID
			return m.domains[i], nil
		}
	}
	d := store.Domain{ID: domainID, ProjectID: projectID, TemplateID: templateID}
	m.domains = append(m.domains, d)
	return d, nil
}

func (m *mockTenantStore) ImportDomains(_ context.Context, projectID, accountID uuid.UUID, zones []provider.Zone) ([]store.Domain, error) {
	m.importCalled = true
	if m.importDomainsErr != nil {
		return nil, m.importDomainsErr
	}
	out := make([]store.Domain, 0, len(zones))
	for _, z := range zones {
		d := store.Domain{ID: uuid.New(), ProjectID: projectID, ProviderAccountID: accountID, ZoneName: z.Name, ZoneID: z.ID}
		out = append(out, d)
	}
	m.domains = append(m.domains, out...)
	m.importDomains = out
	return out, nil
}

type mockCipher struct{}

func (mockCipher) Encrypt(plaintext []byte) (string, error) {
	return "ENC(" + string(plaintext) + ")", nil
}
func (mockCipher) Decrypt(enc string) ([]byte, error) {
	return []byte(strings.TrimSuffix(strings.TrimPrefix(enc, "ENC("), ")")), nil
}

type mockRegistry struct {
	zones       []provider.Zone
	validateErr error
}

func (r *mockRegistry) ByName(name string) (provider.Provider, error) {
	return &mockProvider{zones: r.zones, validateErr: r.validateErr}, nil
}

type mockProvider struct {
	zones []provider.Zone
	// validateErr, when set, makes Validate reject the credentials — lets
	// tests exercise the 400-before-save path of handleCreateAccount.
	validateErr error
}

func (mockProvider) Name() string { return "mock" }
func (p mockProvider) ListZones(context.Context, provider.Credentials) ([]provider.Zone, error) {
	return p.zones, nil
}
func (mockProvider) GetRecords(context.Context, provider.Credentials, string) ([]model.Record, error) {
	return nil, nil
}
func (mockProvider) ApplyChanges(context.Context, provider.Credentials, string, diff.Changeset) error {
	return nil
}
func (p mockProvider) Validate(context.Context, provider.Credentials) error {
	return p.validateErr
}

// newTenantTestAPI wires a fixed authenticated user who owns whatever
// project id is requested (alwaysOwnedAuthStore/alwaysValidSessions, see
// middleware_test.go) — these tests exercise CRUD behavior past the
// RequireAuth/RequireProjectAccess boundary, which has its own dedicated
// coverage in middleware_test.go.
func newTenantTestAPI() (*API, *mockTenantStore) {
	ts := &mockTenantStore{}
	a := &API{
		Store: ts, Cipher: mockCipher{}, Reg: &mockRegistry{},
		Auth: alwaysOwnedAuthStore(), Sessions: alwaysValidSessions(uuid.New()),
	}
	return a, ts
}

// --- accounts ---

// TestCreateAccount_ValidCredentials_EncryptsRawSecretAndCreates covers the
// happy path of the structured-secret contract: secret is a provider-specific
// JSON object, Validate accepts it, and the *raw* JSON (not a re-serialized
// or unwrapped form) is what gets encrypted and handed to the store.
func TestCreateAccount_ValidCredentials_EncryptsRawSecretAndCreates(t *testing.T) {
	a, ts := newTenantTestAPI()
	a.Reg = &mockRegistry{}
	router := NewRouter(a)

	body := `{"provider":"selectel","secret":{"username":"u","password":"super-secret-token","account_id":"123","project_name":"proj"},"comment":"prod"}`
	req := requestWithSessionCookie(http.MethodPost, "/api/v1/projects/"+testPID+"/accounts", strings.NewReader(body))
	w := httptest.NewRecorder()
	router.ServeHTTP(w, req)

	if w.Code != http.StatusCreated {
		t.Fatalf("status %d body %s", w.Code, w.Body.String())
	}
	if strings.Contains(w.Body.String(), "super-secret-token") {
		t.Fatalf("response leaks plaintext secret: %s", w.Body.String())
	}
	if len(ts.createAccounts) != 1 {
		t.Fatalf("expected 1 CreateAccount call, got %d", len(ts.createAccounts))
	}
	got := ts.createAccounts[0].secretEnc
	if got == `{"username":"u","password":"super-secret-token","account_id":"123","project_name":"proj"}` {
		t.Fatalf("store received plaintext secret instead of encrypted value")
	}
	wantEnc := `ENC({"username":"u","password":"super-secret-token","account_id":"123","project_name":"proj"})`
	if got != wantEnc {
		t.Fatalf("unexpected encrypted secret stored: %q, want %q", got, wantEnc)
	}

	var resp accountResponse
	if err := json.Unmarshal(w.Body.Bytes(), &resp); err != nil {
		t.Fatal(err)
	}
	if resp.Provider != "selectel" || resp.Comment != "prod" {
		t.Fatalf("unexpected response: %+v", resp)
	}
}

// TestCreateAccount_InvalidCredentials_Returns400BeforeSave covers the
// trial-auth gate: when the provider rejects the credentials, the handler
// must reject with 400 and a generic message, and must never reach
// Store.CreateAccount (so no bad account is persisted).
func TestCreateAccount_InvalidCredentials_Returns400BeforeSave(t *testing.T) {
	a, ts := newTenantTestAPI()
	a.Reg = &mockRegistry{validateErr: errors.New("identity: invalid password")}
	router := NewRouter(a)

	body := `{"provider":"selectel","secret":{"username":"u","password":"wrong","account_id":"123","project_name":"proj"},"comment":"prod"}`
	req := requestWithSessionCookie(http.MethodPost, "/api/v1/projects/"+testPID+"/accounts", strings.NewReader(body))
	w := httptest.NewRecorder()
	router.ServeHTTP(w, req)

	if w.Code != http.StatusBadRequest {
		t.Fatalf("expected 400, got %d body %s", w.Code, w.Body.String())
	}
	if len(ts.createAccounts) != 0 {
		t.Fatalf("expected CreateAccount not to be called, got %d calls", len(ts.createAccounts))
	}
	if strings.Contains(w.Body.String(), "wrong") || strings.Contains(w.Body.String(), "invalid password") {
		t.Fatalf("response leaks credential/provider error detail: %s", w.Body.String())
	}
}

func TestListAccounts_NoSecretsInResponse(t *testing.T) {
	a, ts := newTenantTestAPI()
	ts.accounts = []store.Account{
		{ID: uuid.New(), Provider: "selectel", SecretEnc: "ENC(top-secret)", Comment: "one"},
		{ID: uuid.New(), Provider: "selectel", SecretEnc: "ENC(other-secret)", Comment: "two"},
	}
	router := NewRouter(a)

	req := requestWithSessionCookie(http.MethodGet, "/api/v1/projects/"+testPID+"/accounts", nil)
	w := httptest.NewRecorder()
	router.ServeHTTP(w, req)

	if w.Code != http.StatusOK {
		t.Fatalf("status %d body %s", w.Code, w.Body.String())
	}
	if strings.Contains(w.Body.String(), "secret") {
		t.Fatalf("response leaks secret field: %s", w.Body.String())
	}
	var resp []accountResponse
	if err := json.Unmarshal(w.Body.Bytes(), &resp); err != nil {
		t.Fatal(err)
	}
	if len(resp) != 2 {
		t.Fatalf("expected 2 accounts, got %d", len(resp))
	}
}

func TestDeleteAccount_BadUUID(t *testing.T) {
	a, _ := newTenantTestAPI()
	router := NewRouter(a)

	req := requestWithSessionCookie(http.MethodDelete, "/api/v1/projects/"+testPID+"/accounts/not-a-uuid", nil)
	w := httptest.NewRecorder()
	router.ServeHTTP(w, req)

	if w.Code != http.StatusBadRequest {
		t.Fatalf("expected 400, got %d", w.Code)
	}
}

// --- templates ---

func TestCreateTemplate_SavesRecords(t *testing.T) {
	a, ts := newTenantTestAPI()
	router := NewRouter(a)

	body := `{"name":"base","records":[{"type":"A","name":"@","ttl":300,"values":["1.2.3.4"]}]}`
	req := requestWithSessionCookie(http.MethodPost, "/api/v1/projects/"+testPID+"/templates", strings.NewReader(body))
	w := httptest.NewRecorder()
	router.ServeHTTP(w, req)

	if w.Code != http.StatusCreated {
		t.Fatalf("status %d body %s", w.Code, w.Body.String())
	}
	if ts.createTemplate == nil {
		t.Fatal("expected CreateTemplate to be called")
	}
	if len(ts.createTemplate.Doc.Records) != 1 || ts.createTemplate.Doc.Records[0].Type != "A" {
		t.Fatalf("unexpected saved doc: %+v", ts.createTemplate.Doc)
	}

	var resp templateResponse
	if err := json.Unmarshal(w.Body.Bytes(), &resp); err != nil {
		t.Fatal(err)
	}
	if resp.Name != "base" || len(resp.Records) != 1 {
		t.Fatalf("unexpected response: %+v", resp)
	}
}

func TestUpdateTemplate_BadUUID(t *testing.T) {
	a, _ := newTenantTestAPI()
	router := NewRouter(a)

	body := `{"name":"x","records":[]}`
	req := requestWithSessionCookie(http.MethodPut, "/api/v1/projects/"+testPID+"/templates/not-a-uuid", strings.NewReader(body))
	w := httptest.NewRecorder()
	router.ServeHTTP(w, req)

	if w.Code != http.StatusBadRequest {
		t.Fatalf("expected 400, got %d", w.Code)
	}
}

// --- domains / import ---

func TestImportZones_CreatesDomainPerZone(t *testing.T) {
	a, ts := newTenantTestAPI()
	accID := uuid.New()
	ts.accounts = []store.Account{{ID: accID, Provider: "selectel", SecretEnc: "ENC(token)"}}
	a.Reg = &mockRegistry{zones: []provider.Zone{
		{ID: "z1", Name: "example.com"},
		{ID: "z2", Name: "example.net"},
	}}
	router := NewRouter(a)

	req := requestWithSessionCookie(http.MethodPost, "/api/v1/projects/"+testPID+"/accounts/"+accID.String()+"/import", nil)
	w := httptest.NewRecorder()
	router.ServeHTTP(w, req)

	if w.Code != http.StatusCreated {
		t.Fatalf("status %d body %s", w.Code, w.Body.String())
	}
	if !ts.importCalled {
		t.Fatal("expected ImportDomains to be called")
	}
	if len(ts.importDomains) != 2 {
		t.Fatalf("expected 2 domains created via ImportDomains, got %d", len(ts.importDomains))
	}
	var resp []domainResponse
	if err := json.Unmarshal(w.Body.Bytes(), &resp); err != nil {
		t.Fatal(err)
	}
	if len(resp) != 2 {
		t.Fatalf("expected 2 domains in response, got %d", len(resp))
	}
}

// TestImportZones_AtomicRollbackOnError verifies that when the store fails
// to import the batch (e.g. a mid-batch DB error), the handler surfaces a
// 500 and — per store.ImportDomains' transactional contract — no partial
// set of domains is left behind (modeled here by ImportDomains returning no
// domains alongside the error).
func TestImportZones_AtomicRollbackOnError(t *testing.T) {
	a, ts := newTenantTestAPI()
	accID := uuid.New()
	ts.accounts = []store.Account{{ID: accID, Provider: "selectel", SecretEnc: "ENC(token)"}}
	ts.importDomainsErr = errors.New("boom: mid-batch failure")
	a.Reg = &mockRegistry{zones: []provider.Zone{
		{ID: "z1", Name: "example.com"},
		{ID: "z2", Name: "example.net"},
	}}
	router := NewRouter(a)

	req := requestWithSessionCookie(http.MethodPost, "/api/v1/projects/"+testPID+"/accounts/"+accID.String()+"/import", nil)
	w := httptest.NewRecorder()
	router.ServeHTTP(w, req)

	if w.Code != http.StatusInternalServerError {
		t.Fatalf("expected 500, got %d body %s", w.Code, w.Body.String())
	}
	if strings.Contains(w.Body.String(), "boom") {
		t.Fatalf("internal error details leaked to response: %s", w.Body.String())
	}
	if len(ts.domains) != 0 {
		t.Fatalf("expected no domains to be created on rollback, got %d", len(ts.domains))
	}
}

func TestImportZones_BadAccountUUID(t *testing.T) {
	a, _ := newTenantTestAPI()
	router := NewRouter(a)

	req := requestWithSessionCookie(http.MethodPost, "/api/v1/projects/"+testPID+"/accounts/not-a-uuid/import", nil)
	w := httptest.NewRecorder()
	router.ServeHTTP(w, req)

	if w.Code != http.StatusBadRequest {
		t.Fatalf("expected 400, got %d", w.Code)
	}
}

func TestCreateDomain_BadProjectUUID(t *testing.T) {
	a, _ := newTenantTestAPI()
	router := NewRouter(a)

	body := `{"providerAccountId":"` + uuid.New().String() + `","zoneName":"example.com","zoneId":"z1"}`
	req := requestWithSessionCookie(http.MethodPost, "/api/v1/projects/not-a-uuid/domains", strings.NewReader(body))
	w := httptest.NewRecorder()
	router.ServeHTTP(w, req)

	if w.Code != http.StatusBadRequest {
		t.Fatalf("expected 400, got %d", w.Code)
	}
}

// TestCreateDomain_AccountNotFoundInProject covers the HIGH tenant-isolation
// fix: a providerAccountId that scoped GetAccount can't find within this
// project must be rejected before any domain is created — otherwise a
// caller could attach a domain to another tenant's provider account.
func TestCreateDomain_AccountNotFoundInProject(t *testing.T) {
	a, ts := newTenantTestAPI()
	router := NewRouter(a)

	// ts.accounts is empty, so GetAccount will not find this id.
	foreignAccID := uuid.New()
	body := `{"providerAccountId":"` + foreignAccID.String() + `","zoneName":"example.com","zoneId":"z1"}`
	req := requestWithSessionCookie(http.MethodPost, "/api/v1/projects/"+testPID+"/domains", strings.NewReader(body))
	w := httptest.NewRecorder()
	router.ServeHTTP(w, req)

	if w.Code != http.StatusNotFound {
		t.Fatalf("expected 404, got %d body %s", w.Code, w.Body.String())
	}
	if ts.createDomains != 0 {
		t.Fatalf("expected CreateDomain not to be called, got %d calls", ts.createDomains)
	}
}

// TestCreateDomain_TemplateNotFoundInProject covers the same isolation fix
// for the optional templateId: a template belonging to another project (or
// nonexistent) must reject the request before the domain is created.
func TestCreateDomain_TemplateNotFoundInProject(t *testing.T) {
	a, ts := newTenantTestAPI()
	accID := uuid.New()
	ts.accounts = []store.Account{{ID: accID, Provider: "selectel", SecretEnc: "ENC(token)"}}
	router := NewRouter(a)

	foreignTplID := uuid.New()
	body := `{"providerAccountId":"` + accID.String() + `","zoneName":"example.com","zoneId":"z1","templateId":"` + foreignTplID.String() + `"}`
	req := requestWithSessionCookie(http.MethodPost, "/api/v1/projects/"+testPID+"/domains", strings.NewReader(body))
	w := httptest.NewRecorder()
	router.ServeHTTP(w, req)

	if w.Code != http.StatusNotFound {
		t.Fatalf("expected 404, got %d body %s", w.Code, w.Body.String())
	}
	if ts.createDomains != 0 {
		t.Fatalf("expected CreateDomain not to be called, got %d calls", ts.createDomains)
	}
}

// TestCreateDomain_HappyPath ensures the tenant-isolation checks don't break
// the existing success path: a valid account in-project and no template.
func TestCreateDomain_HappyPath(t *testing.T) {
	a, ts := newTenantTestAPI()
	accID := uuid.New()
	ts.accounts = []store.Account{{ID: accID, Provider: "selectel", SecretEnc: "ENC(token)"}}
	router := NewRouter(a)

	body := `{"providerAccountId":"` + accID.String() + `","zoneName":"example.com","zoneId":"z1"}`
	req := requestWithSessionCookie(http.MethodPost, "/api/v1/projects/"+testPID+"/domains", strings.NewReader(body))
	w := httptest.NewRecorder()
	router.ServeHTTP(w, req)

	if w.Code != http.StatusCreated {
		t.Fatalf("expected 201, got %d body %s", w.Code, w.Body.String())
	}
	if ts.createDomains != 1 {
		t.Fatalf("expected 1 CreateDomain call, got %d", ts.createDomains)
	}
	var resp domainResponse
	if err := json.Unmarshal(w.Body.Bytes(), &resp); err != nil {
		t.Fatal(err)
	}
	if resp.ZoneName != "example.com" || resp.TemplateID != nil {
		t.Fatalf("unexpected response: %+v", resp)
	}
}

// TestCreateDomain_ValidTemplateInProject ensures a template that scoped
// GetTemplate does find (i.e. belongs to this project) is accepted.
func TestCreateDomain_ValidTemplateInProject(t *testing.T) {
	a, ts := newTenantTestAPI()
	accID := uuid.New()
	tplID := uuid.New()
	ts.accounts = []store.Account{{ID: accID, Provider: "selectel", SecretEnc: "ENC(token)"}}
	ts.templates = []store.Template{{ID: tplID, Name: "base"}}
	router := NewRouter(a)

	body := `{"providerAccountId":"` + accID.String() + `","zoneName":"example.com","zoneId":"z1","templateId":"` + tplID.String() + `"}`
	req := requestWithSessionCookie(http.MethodPost, "/api/v1/projects/"+testPID+"/domains", strings.NewReader(body))
	w := httptest.NewRecorder()
	router.ServeHTTP(w, req)

	if w.Code != http.StatusCreated {
		t.Fatalf("expected 201, got %d body %s", w.Code, w.Body.String())
	}
	var resp domainResponse
	if err := json.Unmarshal(w.Body.Bytes(), &resp); err != nil {
		t.Fatal(err)
	}
	if resp.TemplateID == nil || *resp.TemplateID != tplID.String() {
		t.Fatalf("unexpected response: %+v", resp)
	}
}

// --- domain template binding (import -> check loop) ---

func TestSetDomainTemplate_ValidTemplateId(t *testing.T) {
	a, ts := newTenantTestAPI()
	domID := uuid.New()
	tplID := uuid.New()
	ts.domains = []store.Domain{{ID: domID, ZoneName: "example.com", ZoneID: "z1"}}
	router := NewRouter(a)

	body := `{"templateId":"` + tplID.String() + `"}`
	req := requestWithSessionCookie(http.MethodPatch, "/api/v1/projects/"+testPID+"/domains/"+domID.String(), strings.NewReader(body))
	w := httptest.NewRecorder()
	router.ServeHTTP(w, req)

	if w.Code != http.StatusOK {
		t.Fatalf("expected 200, got %d body %s", w.Code, w.Body.String())
	}
	var resp domainResponse
	if err := json.Unmarshal(w.Body.Bytes(), &resp); err != nil {
		t.Fatal(err)
	}
	if resp.TemplateID == nil || *resp.TemplateID != tplID.String() {
		t.Fatalf("unexpected response: %+v", resp)
	}
}

func TestSetDomainTemplate_BadTemplateUUID(t *testing.T) {
	a, ts := newTenantTestAPI()
	domID := uuid.New()
	ts.domains = []store.Domain{{ID: domID}}
	router := NewRouter(a)

	body := `{"templateId":"not-a-uuid"}`
	req := requestWithSessionCookie(http.MethodPatch, "/api/v1/projects/"+testPID+"/domains/"+domID.String(), strings.NewReader(body))
	w := httptest.NewRecorder()
	router.ServeHTTP(w, req)

	if w.Code != http.StatusBadRequest {
		t.Fatalf("expected 400, got %d body %s", w.Code, w.Body.String())
	}
}

func TestSetDomainTemplate_TemplateNotFound(t *testing.T) {
	a, ts := newTenantTestAPI()
	domID := uuid.New()
	ts.domains = []store.Domain{{ID: domID}}
	ts.setDomainTemplateErr = errors.New("template not found in project")
	router := NewRouter(a)

	body := `{"templateId":"` + uuid.New().String() + `"}`
	req := requestWithSessionCookie(http.MethodPatch, "/api/v1/projects/"+testPID+"/domains/"+domID.String(), strings.NewReader(body))
	w := httptest.NewRecorder()
	router.ServeHTTP(w, req)

	if w.Code != http.StatusNotFound {
		t.Fatalf("expected 404, got %d body %s", w.Code, w.Body.String())
	}
}

func TestDeleteDomain_BadUUID(t *testing.T) {
	a, _ := newTenantTestAPI()
	router := NewRouter(a)

	req := requestWithSessionCookie(http.MethodDelete, "/api/v1/projects/"+testPID+"/domains/not-a-uuid", nil)
	w := httptest.NewRecorder()
	router.ServeHTTP(w, req)

	if w.Code != http.StatusBadRequest {
		t.Fatalf("expected 400, got %d", w.Code)
	}
}