package web_test

import (
	"context"
	"crypto"
	"crypto/ecdsa"
	"crypto/elliptic"
	"crypto/rand"
	"crypto/x509"
	"crypto/x509/pkix"
	"encoding/asn1"
	"errors"
	"fmt"
	"math/big"
	"net/http"
	"net/http/httptest"
	"net/url"
	"os"
	"strings"
	"sync"
	"testing"
	"time"

	"github.com/digitorus/timestamp"

	"github.com/netcell-it/deklarix/internal/auth"
	"github.com/netcell-it/deklarix/internal/extract"
	"github.com/netcell-it/deklarix/internal/rules"
	"github.com/netcell-it/deklarix/internal/store"
	"github.com/netcell-it/deklarix/internal/web"
)

const testSessionCookie = "deklarix_session"

// ─── Fakes ────────────────────────────────────────────────────────────

type fakeExtractor struct {
	facts rules.Facts
	raw   []byte
	err   error
}

func (f fakeExtractor) Extract(ctx context.Context, in extract.Input) (extract.Result, error) {
	if f.err != nil {
		return extract.Result{}, f.err
	}
	raw := f.raw
	if raw == nil {
		raw = []byte(`{}`)
	}
	return extract.Result{Facts: f.facts, RawJSON: raw}, nil
}

func (f fakeExtractor) ModelVersion() string { return "fake-model-v0" }

// fakeStore ist eine In-Memory-Implementierung von web.Store, damit die
// Handler-Tests keine echte Postgres-Instanz brauchen.
type fakeStore struct {
	mu           sync.Mutex
	nextID       int
	accounts     map[string]store.Account
	users        map[string]store.User
	usersByEmail map[string]string // email -> user id
	sessions     map[string]store.Session
	submissions  map[string]store.Submission
	extractions  map[string]store.Extraction
	findings     map[string][]store.Finding
	evidencePkgs map[string]store.EvidencePackage
	participants map[string]store.Participant
	auditLog     []store.AuditEntry
}

func newFakeStore() *fakeStore {
	return &fakeStore{
		accounts:     map[string]store.Account{},
		users:        map[string]store.User{},
		usersByEmail: map[string]string{},
		sessions:     map[string]store.Session{},
		submissions:  map[string]store.Submission{},
		extractions:  map[string]store.Extraction{},
		findings:     map[string][]store.Finding{},
		evidencePkgs: map[string]store.EvidencePackage{},
		participants: map[string]store.Participant{},
	}
}

func (f *fakeStore) newID() string {
	f.nextID++
	return fmt.Sprintf("id-%d", f.nextID)
}

func (f *fakeStore) CreateAccount(ctx context.Context, name string) (store.Account, error) {
	f.mu.Lock()
	defer f.mu.Unlock()
	acc := store.Account{ID: f.newID(), Name: name, CreatedAt: time.Now()}
	f.accounts[acc.ID] = acc
	return acc, nil
}

func (f *fakeStore) GetAccount(ctx context.Context, id string) (store.Account, error) {
	f.mu.Lock()
	defer f.mu.Unlock()
	acc, ok := f.accounts[id]
	if !ok {
		return store.Account{}, store.ErrNotFound
	}
	return acc, nil
}

func (f *fakeStore) ListAccounts(ctx context.Context) ([]store.Account, error) {
	f.mu.Lock()
	defer f.mu.Unlock()
	var out []store.Account
	for _, acc := range f.accounts {
		out = append(out, acc)
	}
	return out, nil
}

func (f *fakeStore) ListVerifiedKanzleien(ctx context.Context) ([]store.Account, error) {
	f.mu.Lock()
	defer f.mu.Unlock()
	var out []store.Account
	for _, acc := range f.accounts {
		if !acc.Verified {
			continue
		}
		hasKanzlei := false
		for _, u := range f.users {
			if u.AccountID == acc.ID && u.Role == "kanzlei" {
				hasKanzlei = true
				break
			}
		}
		if hasKanzlei {
			out = append(out, acc)
		}
	}
	return out, nil
}

func (f *fakeStore) SetAccountVerified(ctx context.Context, id string, verified bool) (store.Account, error) {
	f.mu.Lock()
	defer f.mu.Unlock()
	acc, ok := f.accounts[id]
	if !ok {
		return store.Account{}, store.ErrNotFound
	}
	acc.Verified = verified
	f.accounts[id] = acc
	return acc, nil
}

func (f *fakeStore) ListUsersForAccount(ctx context.Context, accountID string) ([]store.User, error) {
	f.mu.Lock()
	defer f.mu.Unlock()
	var out []store.User
	for _, u := range f.users {
		if u.AccountID == accountID {
			out = append(out, u)
		}
	}
	return out, nil
}

func (f *fakeStore) CreateAuditEntry(ctx context.Context, actorUserID, action, targetType, targetID, details string) (store.AuditEntry, error) {
	f.mu.Lock()
	defer f.mu.Unlock()
	e := store.AuditEntry{
		ID: f.newID(), ActorUserID: actorUserID, Action: action, TargetType: targetType,
		TargetID: targetID, Details: details, CreatedAt: time.Now(),
	}
	f.auditLog = append(f.auditLog, e)
	return e, nil
}

func (f *fakeStore) ListAuditLog(ctx context.Context, limit int) ([]store.AuditEntry, error) {
	f.mu.Lock()
	defer f.mu.Unlock()
	// Neueste zuerst, wie die echte Store-Implementierung (ORDER BY
	// created_at DESC) — hier reicht eine Umkehrung der Einfuegereihenfolge.
	out := make([]store.AuditEntry, len(f.auditLog))
	for i, e := range f.auditLog {
		out[len(f.auditLog)-1-i] = e
	}
	if len(out) > limit {
		out = out[:limit]
	}
	return out, nil
}

func (f *fakeStore) CreateUser(ctx context.Context, accountID, email, passwordHash, role string) (store.User, error) {
	f.mu.Lock()
	defer f.mu.Unlock()
	if _, exists := f.usersByEmail[email]; exists {
		return store.User{}, fmt.Errorf("fakeStore: email %s bereits vergeben", email)
	}
	u := store.User{
		ID: f.newID(), AccountID: accountID, Email: email, PasswordHash: passwordHash,
		Role: role, CreatedAt: time.Now(),
	}
	f.users[u.ID] = u
	f.usersByEmail[email] = u.ID
	return u, nil
}

func (f *fakeStore) GetUserByEmail(ctx context.Context, email string) (store.User, error) {
	f.mu.Lock()
	defer f.mu.Unlock()
	id, ok := f.usersByEmail[email]
	if !ok {
		return store.User{}, store.ErrNotFound
	}
	return f.users[id], nil
}

func (f *fakeStore) GetUser(ctx context.Context, id string) (store.User, error) {
	f.mu.Lock()
	defer f.mu.Unlock()
	u, ok := f.users[id]
	if !ok {
		return store.User{}, store.ErrNotFound
	}
	return u, nil
}

func (f *fakeStore) CreateSession(ctx context.Context, token, userID string, expiresAt time.Time) (store.Session, error) {
	f.mu.Lock()
	defer f.mu.Unlock()
	sess := store.Session{Token: token, UserID: userID, ExpiresAt: expiresAt, CreatedAt: time.Now()}
	f.sessions[token] = sess
	return sess, nil
}

func (f *fakeStore) GetSession(ctx context.Context, token string) (store.Session, error) {
	f.mu.Lock()
	defer f.mu.Unlock()
	sess, ok := f.sessions[token]
	if !ok {
		return store.Session{}, store.ErrNotFound
	}
	return sess, nil
}

func (f *fakeStore) DeleteSession(ctx context.Context, token string) error {
	f.mu.Lock()
	defer f.mu.Unlock()
	delete(f.sessions, token)
	return nil
}

func (f *fakeStore) CreateSubmission(ctx context.Context, accountID, platform, postType, caption string) (store.Submission, error) {
	f.mu.Lock()
	defer f.mu.Unlock()
	sub := store.Submission{
		ID: f.newID(), AccountID: accountID, Platform: platform, PostType: postType, Caption: caption,
		Status: "draft", CreatedAt: time.Now(), UpdatedAt: time.Now(),
	}
	f.submissions[sub.ID] = sub
	return sub, nil
}

func (f *fakeStore) GetSubmission(ctx context.Context, id string) (store.Submission, error) {
	f.mu.Lock()
	defer f.mu.Unlock()
	sub, ok := f.submissions[id]
	if !ok {
		return store.Submission{}, store.ErrNotFound
	}
	return sub, nil
}

func (f *fakeStore) SetSubmissionStatus(ctx context.Context, id, status string) error {
	f.mu.Lock()
	defer f.mu.Unlock()
	sub, ok := f.submissions[id]
	if !ok {
		return fmt.Errorf("fakeStore: submission %s nicht gefunden", id)
	}
	sub.Status = status
	f.submissions[id] = sub
	return nil
}

func (f *fakeStore) CreateExtraction(ctx context.Context, submissionID string, payload []byte, modelVersion, promptVersion string) (store.Extraction, error) {
	f.mu.Lock()
	defer f.mu.Unlock()
	ext := store.Extraction{
		ID: f.newID(), SubmissionID: submissionID, Payload: payload,
		ModelVersion: modelVersion, PromptVersion: promptVersion, CreatedAt: time.Now(),
	}
	f.extractions[submissionID] = ext
	return ext, nil
}

func (f *fakeStore) GetLatestExtraction(ctx context.Context, submissionID string) (store.Extraction, error) {
	f.mu.Lock()
	defer f.mu.Unlock()
	ext, ok := f.extractions[submissionID]
	if !ok {
		return store.Extraction{}, fmt.Errorf("fakeStore: keine Extraktion fuer %s", submissionID)
	}
	return ext, nil
}

func (f *fakeStore) CreateFinding(ctx context.Context, submissionID string, extractionID *string, ruleID string, ruleVersion int, severity, title, fix string, sources []string) (store.Finding, error) {
	f.mu.Lock()
	defer f.mu.Unlock()
	finding := store.Finding{
		ID: f.newID(), SubmissionID: submissionID, ExtractionID: extractionID,
		RuleID: ruleID, RuleVersion: ruleVersion, Severity: severity,
		Title: title, Fix: fix, Sources: sources, CreatedAt: time.Now(),
	}
	f.findings[submissionID] = append(f.findings[submissionID], finding)
	return finding, nil
}

func (f *fakeStore) ListCurrentFindings(ctx context.Context, submissionID string) ([]store.Finding, error) {
	f.mu.Lock()
	defer f.mu.Unlock()
	return f.findings[submissionID], nil
}

func (f *fakeStore) CreateEvidencePackage(ctx context.Context, submissionID, dossierPath, sha256Hex string, timestampToken []byte) (store.EvidencePackage, error) {
	f.mu.Lock()
	defer f.mu.Unlock()
	pkg := store.EvidencePackage{
		ID: f.newID(), SubmissionID: submissionID, DossierPath: dossierPath,
		SHA256: sha256Hex, TimestampToken: timestampToken, CreatedAt: time.Now(),
	}
	f.evidencePkgs[submissionID] = pkg
	return pkg, nil
}

func (f *fakeStore) GetLatestEvidencePackage(ctx context.Context, submissionID string) (store.EvidencePackage, error) {
	f.mu.Lock()
	defer f.mu.Unlock()
	pkg, ok := f.evidencePkgs[submissionID]
	if !ok {
		return store.EvidencePackage{}, fmt.Errorf("fakeStore: kein evidence package fuer %s", submissionID)
	}
	return pkg, nil
}

func (f *fakeStore) ListSubmissionsForAccount(ctx context.Context, accountID string) ([]store.SubmissionSummary, error) {
	f.mu.Lock()
	defer f.mu.Unlock()
	var out []store.SubmissionSummary
	for _, sub := range f.submissions {
		if sub.AccountID != accountID {
			continue
		}
		sum := store.SubmissionSummary{Submission: sub}
		rank := 0
		for _, finding := range f.findings[sub.ID] {
			sum.FindingCount++
			r := severityRank(finding.Severity)
			if r > rank {
				rank = r
				sum.HighestSeverity = finding.Severity
			}
		}
		out = append(out, sum)
	}
	return out, nil
}

func severityRank(severity string) int {
	switch severity {
	case "hoch":
		return 3
	case "mittel":
		return 2
	case "niedrig":
		return 1
	default:
		return 0
	}
}

func (f *fakeStore) CreateParticipant(ctx context.Context, submissionID, role, name string, vorgegeben, freigegeben bool) (store.Participant, error) {
	f.mu.Lock()
	defer f.mu.Unlock()
	p := store.Participant{
		ID: f.newID(), SubmissionID: submissionID, Role: role, Name: name,
		Vorgegeben: vorgegeben, Freigegeben: freigegeben, CreatedAt: time.Now(),
	}
	if freigegeben {
		now := time.Now()
		p.ApprovedAt = &now
	}
	f.participants[p.ID] = p
	return p, nil
}

func (f *fakeStore) ListParticipants(ctx context.Context, submissionID string) ([]store.Participant, error) {
	f.mu.Lock()
	defer f.mu.Unlock()
	var out []store.Participant
	for _, p := range f.participants {
		if p.SubmissionID == submissionID {
			out = append(out, p)
		}
	}
	return out, nil
}

func (f *fakeStore) GetParticipant(ctx context.Context, id string) (store.Participant, error) {
	f.mu.Lock()
	defer f.mu.Unlock()
	p, ok := f.participants[id]
	if !ok {
		return store.Participant{}, store.ErrNotFound
	}
	return p, nil
}

func (f *fakeStore) UpdateParticipant(ctx context.Context, id string, vorgegeben, freigegeben bool) (store.Participant, error) {
	f.mu.Lock()
	defer f.mu.Unlock()
	p, ok := f.participants[id]
	if !ok {
		return store.Participant{}, store.ErrNotFound
	}
	p.Vorgegeben = vorgegeben
	p.Freigegeben = freigegeben
	if freigegeben && p.ApprovedAt == nil {
		now := time.Now()
		p.ApprovedAt = &now
	}
	f.participants[id] = p
	return p, nil
}

func (f *fakeStore) DeleteParticipant(ctx context.Context, id string) error {
	f.mu.Lock()
	defer f.mu.Unlock()
	if _, ok := f.participants[id]; !ok {
		return store.ErrNotFound
	}
	delete(f.participants, id)
	return nil
}

// fakeTimestamper liefert einen offline erzeugten, strukturell gültigen
// (selbstsignierten) RFC-3161-Token — genug, damit evidence.TimestampTime
// ihn parsen kann, ohne eine echte TSA zu brauchen.
type fakeTimestamper struct{}

func (fakeTimestamper) Timestamp(ctx context.Context, hash []byte) ([]byte, error) {
	key, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
	if err != nil {
		return nil, err
	}
	now := time.Now()
	certTemplate := &x509.Certificate{
		SerialNumber: big.NewInt(1),
		Subject:      pkix.Name{CommonName: "deklarix-test-tsa"},
		NotBefore:    now.Add(-time.Hour),
		NotAfter:     now.Add(time.Hour),
		KeyUsage:     x509.KeyUsageDigitalSignature,
		ExtKeyUsage:  []x509.ExtKeyUsage{x509.ExtKeyUsageTimeStamping},
	}
	certDER, err := x509.CreateCertificate(rand.Reader, certTemplate, certTemplate, &key.PublicKey, key)
	if err != nil {
		return nil, err
	}
	cert, err := x509.ParseCertificate(certDER)
	if err != nil {
		return nil, err
	}
	ts := timestamp.Timestamp{
		HashAlgorithm: crypto.SHA256,
		HashedMessage: hash,
		Time:          now,
		SerialNumber:  big.NewInt(1),
		Policy:        asn1.ObjectIdentifier{1, 2, 3},
	}
	respDER, err := ts.CreateResponse(cert, key)
	if err != nil {
		return nil, err
	}
	parsed, err := timestamp.ParseResponse(respDER)
	if err != nil {
		return nil, err
	}
	return parsed.RawToken, nil
}

// ─── Test-Setup ───────────────────────────────────────────────────────

func loadRealRules(t *testing.T) []rules.Rule {
	t.Helper()
	rs, err := rules.Load(os.DirFS("../../rules"))
	if err != nil {
		t.Fatalf("rules.Load: %v", err)
	}
	return rs
}

func newServer(t *testing.T, ex web.Extractor, fs *fakeStore) *web.Server {
	t.Helper()
	s, err := web.NewServer(ex, loadRealRules(t), fs, fakeTimestamper{}, t.TempDir())
	if err != nil {
		t.Fatalf("NewServer: %v", err)
	}
	return s
}

// seedAccount legt direkt im fakeStore (ohne HTTP) einen Account, einen
// Nutzer und eine gültige Sitzung an und liefert das Session-Cookie.
func seedAccount(t *testing.T, fs *fakeStore, accountName, email string) *http.Cookie {
	t.Helper()
	return seedAccountWithRole(t, fs, accountName, email, "creator")
}

func seedAccountWithRole(t *testing.T, fs *fakeStore, accountName, email, role string) *http.Cookie {
	t.Helper()
	ctx := context.Background()
	acc, err := fs.CreateAccount(ctx, accountName)
	if err != nil {
		t.Fatalf("CreateAccount: %v", err)
	}
	hash, err := auth.HashPassword("test-passwort-123")
	if err != nil {
		t.Fatalf("HashPassword: %v", err)
	}
	user, err := fs.CreateUser(ctx, acc.ID, email, hash, role)
	if err != nil {
		t.Fatalf("CreateUser: %v", err)
	}
	token, err := auth.NewSessionToken()
	if err != nil {
		t.Fatalf("NewSessionToken: %v", err)
	}
	if _, err := fs.CreateSession(ctx, token, user.ID, time.Now().Add(time.Hour)); err != nil {
		t.Fatalf("CreateSession: %v", err)
	}
	return &http.Cookie{Name: testSessionCookie, Value: token}
}

// newAuthedTestServer ist der Standardfall für Tests, die sich nicht für
// Auth selbst interessieren: ein Server plus ein fertig angemeldeter Mandant.
func newAuthedTestServer(t *testing.T, ex web.Extractor) (*web.Server, *fakeStore, *http.Cookie) {
	t.Helper()
	fs := newFakeStore()
	s := newServer(t, ex, fs)
	cookie := seedAccount(t, fs, "Test-Mandant", "test@example.com")
	return s, fs, cookie
}

func postForm(t *testing.T, s *web.Server, cookie *http.Cookie, path string, form url.Values) *httptest.ResponseRecorder {
	t.Helper()
	req := httptest.NewRequest(http.MethodPost, path, strings.NewReader(form.Encode()))
	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
	if cookie != nil {
		req.AddCookie(cookie)
	}
	w := httptest.NewRecorder()
	s.ServeHTTP(w, req)
	return w
}

func getWithCookie(t *testing.T, s *web.Server, cookie *http.Cookie, path string) *httptest.ResponseRecorder {
	t.Helper()
	req := httptest.NewRequest(http.MethodGet, path, nil)
	if cookie != nil {
		req.AddCookie(cookie)
	}
	w := httptest.NewRecorder()
	s.ServeHTTP(w, req)
	return w
}

func checkForm(extra ...string) url.Values {
	v := url.Values{
		"platform": {"instagram"}, "post_type": {"reel"},
		"consideration": {"bezahlt"}, "caption": {"Werbung: ..."},
	}
	for i := 0; i+1 < len(extra); i += 2 {
		v.Set(extra[i], extra[i+1])
	}
	return v
}

// ─── Tests: Health, statische Assets (kein Auth nötig) ────────────────

func TestHandleHealth(t *testing.T) {
	s, _, _ := newAuthedTestServer(t, fakeExtractor{})

	req := httptest.NewRequest(http.MethodGet, "/health", nil)
	w := httptest.NewRecorder()
	s.ServeHTTP(w, req)

	if w.Code != http.StatusOK {
		t.Fatalf("status = %d, want 200", w.Code)
	}
	if w.Body.String() != `{"ok":true}` {
		t.Fatalf("body = %q, want {\"ok\":true}", w.Body.String())
	}
}

func TestHandleStaticServesHTMX(t *testing.T) {
	s, _, _ := newAuthedTestServer(t, fakeExtractor{})

	req := httptest.NewRequest(http.MethodGet, "/static/htmx.min.js", nil)
	w := httptest.NewRecorder()
	s.ServeHTTP(w, req)

	if w.Code != http.StatusOK {
		t.Fatalf("status = %d, want 200", w.Code)
	}
	if w.Body.Len() < 1000 {
		t.Fatalf("htmx.min.js suspiciously small: %d bytes", w.Body.Len())
	}
}

// ─── Tests: Auth (Registrierung, Login, Logout, Zugriffsschutz) ───────

func TestRegisterThenLoginThenAccessProtectedPage(t *testing.T) {
	fs := newFakeStore()
	s := newServer(t, fakeExtractor{}, fs)

	regResp := postForm(t, s, nil, "/register", url.Values{
		"account_name": {"Meine Agentur"}, "email": {"neu@example.com"},
		"password": {"ein-sicheres-passwort"}, "role": {"agentur"},
	})
	if regResp.Code != http.StatusSeeOther {
		t.Fatalf("register status = %d, want 303, body: %s", regResp.Code, regResp.Body.String())
	}
	cookies := regResp.Result().Cookies()
	if len(cookies) == 0 {
		t.Fatal("expected a session cookie to be set after registration")
	}

	// Mit dem gesetzten Cookie muss die geschützte Startseite erreichbar sein.
	indexResp := getWithCookie(t, s, cookies[0], "/")
	if indexResp.Code != http.StatusOK {
		t.Fatalf("index status with fresh session = %d, want 200", indexResp.Code)
	}
}

func TestRegisterRejectsDuplicateEmail(t *testing.T) {
	fs := newFakeStore()
	s := newServer(t, fakeExtractor{}, fs)
	form := url.Values{
		"account_name": {"A"}, "email": {"doppelt@example.com"},
		"password": {"ein-sicheres-passwort"}, "role": {"creator"},
	}
	if resp := postForm(t, s, nil, "/register", form); resp.Code != http.StatusSeeOther {
		t.Fatalf("first register status = %d, want 303", resp.Code)
	}
	resp := postForm(t, s, nil, "/register", form)
	if resp.Code != http.StatusOK {
		t.Fatalf("second register status = %d, want 200 (re-rendered form with error)", resp.Code)
	}
	if !strings.Contains(resp.Body.String(), "schon vergeben") {
		t.Errorf("expected a duplicate-email error, got: %s", resp.Body.String())
	}
}

func TestLoginWithCorrectPassword(t *testing.T) {
	fs := newFakeStore()
	s := newServer(t, fakeExtractor{}, fs)
	hash, err := auth.HashPassword("richtiges-passwort")
	if err != nil {
		t.Fatalf("HashPassword: %v", err)
	}
	acc, err := fs.CreateAccount(context.Background(), "Bestehender Mandant")
	if err != nil {
		t.Fatalf("CreateAccount: %v", err)
	}
	if _, err := fs.CreateUser(context.Background(), acc.ID, "bestehend@example.com", hash, "marke"); err != nil {
		t.Fatalf("CreateUser: %v", err)
	}

	resp := postForm(t, s, nil, "/login", url.Values{"email": {"bestehend@example.com"}, "password": {"richtiges-passwort"}})
	if resp.Code != http.StatusSeeOther {
		t.Fatalf("login status = %d, want 303, body: %s", resp.Code, resp.Body.String())
	}
	if len(resp.Result().Cookies()) == 0 {
		t.Fatal("expected a session cookie after successful login")
	}
}

func TestLoginRedirectsAdminToAdminDashboard(t *testing.T) {
	fs := newFakeStore()
	s := newServer(t, fakeExtractor{}, fs)
	hash, err := auth.HashPassword("admin-passwort")
	if err != nil {
		t.Fatalf("HashPassword: %v", err)
	}
	acc, err := fs.CreateAccount(context.Background(), "Deklarix Admin")
	if err != nil {
		t.Fatalf("CreateAccount: %v", err)
	}
	if _, err := fs.CreateUser(context.Background(), acc.ID, "admin@example.com", hash, "admin"); err != nil {
		t.Fatalf("CreateUser: %v", err)
	}

	resp := postForm(t, s, nil, "/login", url.Values{"email": {"admin@example.com"}, "password": {"admin-passwort"}})
	if resp.Code != http.StatusSeeOther {
		t.Fatalf("status = %d, want 303, body: %s", resp.Code, resp.Body.String())
	}
	if loc := resp.Header().Get("Location"); loc != "/admin" {
		t.Fatalf("Location = %q, want /admin for an admin login", loc)
	}
}

func TestLoginRejectsWrongPassword(t *testing.T) {
	fs := newFakeStore()
	s := newServer(t, fakeExtractor{}, fs)
	hash, err := auth.HashPassword("richtiges-passwort")
	if err != nil {
		t.Fatalf("HashPassword: %v", err)
	}
	acc, _ := fs.CreateAccount(context.Background(), "X")
	if _, err := fs.CreateUser(context.Background(), acc.ID, "x@example.com", hash, "marke"); err != nil {
		t.Fatalf("CreateUser: %v", err)
	}

	resp := postForm(t, s, nil, "/login", url.Values{"email": {"x@example.com"}, "password": {"falsch"}})
	if resp.Code != http.StatusOK {
		t.Fatalf("status = %d, want 200 (re-rendered login form)", resp.Code)
	}
	if len(resp.Result().Cookies()) != 0 {
		t.Fatal("expected no session cookie for a failed login")
	}
}

func TestLoginRejectsUnknownEmailWithSameMessageAsWrongPassword(t *testing.T) {
	fs := newFakeStore()
	s := newServer(t, fakeExtractor{}, fs)

	resp := postForm(t, s, nil, "/login", url.Values{"email": {"gibtsnicht@example.com"}, "password": {"irgendwas"}})
	if !strings.Contains(resp.Body.String(), "E-Mail oder Passwort falsch") {
		t.Errorf("expected the generic invalid-credentials message, got: %s", resp.Body.String())
	}
}

func TestIndexRedirectsToLoginWithoutSession(t *testing.T) {
	s, _, _ := newAuthedTestServer(t, fakeExtractor{})

	req := httptest.NewRequest(http.MethodGet, "/", nil)
	w := httptest.NewRecorder()
	s.ServeHTTP(w, req)

	if w.Code != http.StatusSeeOther {
		t.Fatalf("status = %d, want 303 redirect to /login", w.Code)
	}
	if loc := w.Header().Get("Location"); loc != "/login" {
		t.Fatalf("Location = %q, want /login", loc)
	}
}

func TestCheckRejectsRequestsWithoutSession(t *testing.T) {
	s, _, _ := newAuthedTestServer(t, fakeExtractor{})

	w := postForm(t, s, nil, "/pruefen", checkForm())
	if w.Code != http.StatusUnauthorized {
		t.Fatalf("status = %d, want 401 without a session", w.Code)
	}
}

func TestLogoutClearsSession(t *testing.T) {
	s, fs, cookie := newAuthedTestServer(t, fakeExtractor{})

	if resp := getWithCookie(t, s, cookie, "/"); resp.Code != http.StatusOK {
		t.Fatalf("index before logout = %d, want 200", resp.Code)
	}

	logoutResp := postForm(t, s, cookie, "/logout", url.Values{})
	if logoutResp.Code != http.StatusSeeOther {
		t.Fatalf("logout status = %d, want 303", logoutResp.Code)
	}
	if _, err := fs.GetSession(context.Background(), cookie.Value); !errors.Is(err, store.ErrNotFound) {
		t.Fatal("expected the session to be deleted from the store after logout")
	}

	if resp := getWithCookie(t, s, cookie, "/"); resp.Code != http.StatusSeeOther {
		t.Fatalf("index after logout = %d, want 303 redirect (session no longer valid)", resp.Code)
	}
}

// ─── Tests: Pre-Publish-Prüfung (angemeldet) ──────────────────────────

func TestHandleIndexRendersForm(t *testing.T) {
	s, _, cookie := newAuthedTestServer(t, fakeExtractor{})

	resp := getWithCookie(t, s, cookie, "/")
	if resp.Code != http.StatusOK {
		t.Fatalf("status = %d, want 200", resp.Code)
	}
	body := resp.Body.String()
	for _, want := range []string{`name="platform"`, `name="post_type"`, `name="caption"`, `hx-post="/pruefen"`} {
		if !strings.Contains(body, want) {
			t.Errorf("index body missing %q\nbody: %s", want, body)
		}
	}
}

func TestHandleCheckRejectsMissingFields(t *testing.T) {
	s, _, cookie := newAuthedTestServer(t, fakeExtractor{})

	w := postForm(t, s, cookie, "/pruefen", url.Values{"platform": {"instagram"}})
	if w.Code != http.StatusBadRequest {
		t.Fatalf("status = %d, want 400 for missing fields", w.Code)
	}
}

func TestHandleCheckPropagatesExtractionError(t *testing.T) {
	s, _, cookie := newAuthedTestServer(t, fakeExtractor{err: fmt.Errorf("simulierter Extraktionsfehler")})

	w := postForm(t, s, cookie, "/pruefen", checkForm())
	if w.Code != http.StatusBadGateway {
		t.Fatalf("status = %d, want 502 when extraction fails", w.Code)
	}
}

func TestHandleCheckPersistsSubmissionExtractionAndFindings(t *testing.T) {
	s, fs, cookie := newAuthedTestServer(t, fakeExtractor{facts: rules.Facts{
		Platform: "instagram", Jurisdiction: "DE", Consideration: rules.ConsiderationPaid,
		DisclosurePresent: true, DisclosureWording: "Werbung", DisclosureBeforeCut: false,
	}, raw: []byte(`{"gegenleistung":"bezahlt"}`)})

	w := postForm(t, s, cookie, "/pruefen", checkForm())
	if w.Code != http.StatusOK {
		t.Fatalf("status = %d, want 200, body: %s", w.Code, w.Body.String())
	}
	if !strings.Contains(w.Body.String(), "WK-004") {
		t.Fatalf("expected WK-004 in result, got: %s", w.Body.String())
	}

	if len(fs.submissions) != 1 {
		t.Fatalf("expected 1 persisted submission, got %d", len(fs.submissions))
	}
	var subID string
	for id, sub := range fs.submissions {
		subID = id
		if sub.Status != "checked" {
			t.Errorf("submission status = %q, want checked", sub.Status)
		}
		if sub.AccountID == "" {
			t.Error("expected the submission to carry the current account's ID")
		}
	}
	if _, ok := fs.extractions[subID]; !ok {
		t.Error("expected an extraction to be persisted")
	}
	if len(fs.findings[subID]) != 1 || fs.findings[subID][0].RuleID != "WK-004" {
		t.Errorf("expected exactly one persisted WK-004 finding, got %+v", fs.findings[subID])
	}
}

func TestHandleCheckRendersNeedsClarificationAndDoesNotOfferArchive(t *testing.T) {
	s, fs, cookie := newAuthedTestServer(t, fakeExtractor{facts: rules.Facts{
		Platform: "instagram", Jurisdiction: "DE", Consideration: rules.ConsiderationUnclear,
	}})

	w := postForm(t, s, cookie, "/pruefen", checkForm())
	body := w.Body.String()
	if strings.Contains(body, "WK-") {
		t.Errorf("expected no rule findings for an unclear extraction, got: %s", body)
	}
	if !strings.Contains(body, "nicht sicher bestimmt") {
		t.Errorf("expected a clarification message, got: %s", body)
	}
	if strings.Contains(body, "/veroeffentlichen") {
		t.Errorf("expected no archive option when clarification is needed, got: %s", body)
	}
	for _, sub := range fs.submissions {
		if sub.Status == "checked" {
			t.Error("submission should not be marked checked when clarification is needed")
		}
	}
}

func TestHandleCheckCleanCaseHasNoFindingsAndOffersArchive(t *testing.T) {
	s, _, cookie := newAuthedTestServer(t, fakeExtractor{facts: rules.Facts{
		Platform: "instagram", Jurisdiction: "DE", Consideration: rules.ConsiderationNone,
	}})

	w := postForm(t, s, cookie, "/pruefen", checkForm())
	if w.Code != http.StatusOK {
		t.Fatalf("status = %d, want 200", w.Code)
	}
	body := w.Body.String()
	if strings.Contains(body, "WK-") {
		t.Errorf("expected no findings for an organic post, got: %s", body)
	}
	if !strings.Contains(body, "Keine Kennzeichnungsrisiken") {
		t.Errorf("expected the no-findings message, got: %s", body)
	}
	if !strings.Contains(body, "/veroeffentlichen") {
		t.Errorf("expected an archive option even with no findings (still a real check), got: %s", body)
	}
}

// ─── Tests: Archivierung + Mandantentrennung ──────────────────────────

func TestFullCheckThenArchiveFlow(t *testing.T) {
	s, fs, cookie := newAuthedTestServer(t, fakeExtractor{facts: rules.Facts{
		Platform: "instagram", Jurisdiction: "DE", Consideration: rules.ConsiderationPaid,
		DisclosurePresent: true, DisclosureWording: "Werbung", DisclosureBeforeCut: false,
	}, raw: []byte(`{"gegenleistung":"bezahlt","kennzeichnung_vorhanden":true,"kennzeichnung_wortlaut":"Werbung","kennzeichnung_vor_kuerzung":false}`)})

	checkResp := postForm(t, s, cookie, "/pruefen", checkForm())
	if checkResp.Code != http.StatusOK {
		t.Fatalf("check status = %d, body: %s", checkResp.Code, checkResp.Body.String())
	}
	if !strings.Contains(checkResp.Body.String(), `name="submission_id"`) {
		t.Fatalf("expected a hidden submission_id field in the result, got: %s", checkResp.Body.String())
	}

	var subID string
	for id := range fs.submissions {
		subID = id
	}

	archiveResp := postForm(t, s, cookie, "/veroeffentlichen", url.Values{"submission_id": {subID}})
	if archiveResp.Code != http.StatusOK {
		t.Fatalf("archive status = %d, body: %s", archiveResp.Code, archiveResp.Body.String())
	}
	if !strings.Contains(archiveResp.Body.String(), "/dossier/"+subID) {
		t.Fatalf("expected a dossier download link, got: %s", archiveResp.Body.String())
	}

	pkg, ok := fs.evidencePkgs[subID]
	if !ok {
		t.Fatal("expected an evidence package to be persisted")
	}
	if fs.submissions[subID].Status != "published" {
		t.Errorf("submission status = %q, want published", fs.submissions[subID].Status)
	}

	downloadReq := httptest.NewRequest(http.MethodGet, "/dossier/"+subID, nil)
	downloadReq.AddCookie(cookie)
	downloadReq.SetPathValue("id", subID)
	downloadW := httptest.NewRecorder()
	s.ServeHTTP(downloadW, downloadReq)
	if downloadW.Code != http.StatusOK {
		t.Fatalf("download status = %d", downloadW.Code)
	}
	if !strings.HasPrefix(downloadW.Body.String(), "%PDF-") {
		t.Fatal("downloaded dossier does not start with the PDF header")
	}

	if _, err := os.Stat(pkg.DossierPath); err != nil {
		t.Fatalf("dossier file does not exist on disk: %v", err)
	}
}

func TestHandleArchiveRejectsUnknownSubmission(t *testing.T) {
	s, _, cookie := newAuthedTestServer(t, fakeExtractor{})

	w := postForm(t, s, cookie, "/veroeffentlichen", url.Values{"submission_id": {"does-not-exist"}})
	if w.Code != http.StatusNotFound {
		t.Fatalf("status = %d, want 404 for an unknown submission", w.Code)
	}
}

func TestTenantIsolationArchiveAndDownload(t *testing.T) {
	fs := newFakeStore()
	s := newServer(t, fakeExtractor{facts: rules.Facts{
		Platform: "instagram", Jurisdiction: "DE", Consideration: rules.ConsiderationNone,
	}, raw: []byte(`{"gegenleistung":"keine","kennzeichnung_vorhanden":false,"kennzeichnung_wortlaut":"","kennzeichnung_vor_kuerzung":false}`)}, fs)

	cookieA := seedAccount(t, fs, "Mandant A", "a@example.com")
	cookieB := seedAccount(t, fs, "Mandant B", "b@example.com")

	checkResp := postForm(t, s, cookieA, "/pruefen", checkForm())
	if checkResp.Code != http.StatusOK {
		t.Fatalf("check status = %d", checkResp.Code)
	}
	var subID string
	for id, sub := range fs.submissions {
		if sub.AccountID != "" {
			subID = id
		}
	}
	if subID == "" {
		t.Fatal("expected a submission to have been created for Mandant A")
	}

	// Mandant B darf As Beitrag weder archivieren noch dessen Dossier
	// abrufen — beides muss wie "nicht gefunden" aussehen, nicht wie ein
	// expliziter Zugriffsfehler.
	archiveResp := postForm(t, s, cookieB, "/veroeffentlichen", url.Values{"submission_id": {subID}})
	if archiveResp.Code != http.StatusNotFound {
		t.Fatalf("cross-tenant archive status = %d, want 404", archiveResp.Code)
	}

	// Damit A tatsächlich etwas zum Herunterladen hat: A archiviert selbst.
	ownArchiveResp := postForm(t, s, cookieA, "/veroeffentlichen", url.Values{"submission_id": {subID}})
	if ownArchiveResp.Code != http.StatusOK {
		t.Fatalf("own archive status = %d, body: %s", ownArchiveResp.Code, ownArchiveResp.Body.String())
	}

	downloadReq := httptest.NewRequest(http.MethodGet, "/dossier/"+subID, nil)
	downloadReq.AddCookie(cookieB)
	downloadReq.SetPathValue("id", subID)
	downloadW := httptest.NewRecorder()
	s.ServeHTTP(downloadW, downloadReq)
	if downloadW.Code != http.StatusNotFound {
		t.Fatalf("cross-tenant download status = %d, want 404", downloadW.Code)
	}
}