package api

import (
	"bytes"
	"context"
	"encoding/base64"
	"encoding/json"
	"errors"
	"fmt"
	"io"
	"log"
	"net"
	"net/http"
	"net/url"
	"regexp"
	"strconv"
	"strings"
	"time"

	"fission-console/internal/auth"
	"fission-console/internal/fission"
	"fission-console/internal/model"
	"fission-console/internal/runtime"

	apierrors "k8s.io/apimachinery/pkg/api/errors"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
)

// validFuncName — RFC 1123 subdomain label: строчные буквы+цифры+дефис, без дефиса в начале/конце.
// Максимум 57 символов (не 63): самый длинный суффикс "-route" (HTTPTrigger) = 6 символов.
// 63 - 6 = 57. Fission webhook требует все связанные объекты <= 63 символов.
var validFuncName = regexp.MustCompile(`^[a-z0-9]([a-z0-9-]*[a-z0-9])?$`)

// maxCodeSize — максимальный размер кода функции (1 MB).
// Выше — не имеет смысла для inline функции; лучше использовать Package с URL.
const maxCodeSize = 1 << 20

// defaultFunctionInvokeTimeout совпадает с дефолтом Fission для spec.functionTimeout.
const defaultFunctionInvokeTimeout = 60 * time.Second

func buildDeployArchive(lang, code string) ([]byte, error) {
	switch lang {
	case "nodejs":
		return runtime.BuildJSDeployZip(code)
	case "php":
		return runtime.BuildScriptZip(code, "main.php")
	case "ruby":
		return runtime.BuildScriptZip(code, "handler.rb")
	default:
		return []byte(code), nil
	}
}

// deleteFromStoragesvc удаляет архив из S3 через storagesvc по URL из Package spec.
// URL имеет формат: http://storagesvc.../v1/archive?id=fission/UUID
// Best-effort: ошибка логируется, но не прерывает операцию удаления.
func (s *Server) deleteFromStoragesvc(ctx context.Context, archiveURL string) {
	if s.storagesvcURL == "" || archiveURL == "" {
		return
	}
	// archiveURL = "http://storagesvc.../v1/archive?id=fission/UUID"
	// Строим DELETE URL к storagesvc, сохраняя query-параметр id
	parsed, err := url.Parse(archiveURL)
	if err != nil {
		log.Printf("deleteFromStoragesvc: parse url %q: %v", archiveURL, err)
		return
	}
	deleteURL := strings.TrimRight(s.storagesvcURL, "/") + "/v1/archive?" + parsed.RawQuery
	req, err := http.NewRequestWithContext(ctx, http.MethodDelete, deleteURL, nil)
	if err != nil {
		log.Printf("deleteFromStoragesvc: build request: %v", err)
		return
	}
	resp, err := s.http.Do(req)
	if err != nil {
		log.Printf("deleteFromStoragesvc: %v", err)
		return
	}
	defer resp.Body.Close()
	if resp.StatusCode != http.StatusOK && resp.StatusCode != http.StatusNoContent {
		body, _ := io.ReadAll(resp.Body)
		log.Printf("deleteFromStoragesvc: status %d: %s", resp.StatusCode, strings.TrimSpace(string(body)))
		return
	}
	log.Printf("deleteFromStoragesvc: deleted %s", parsed.Query().Get("id"))
}

// uploadToStoragesvc загружает байты в Fission storagesvc и возвращает URL для package archive.
// Если storagesvcURL не задан — возвращает пустую строку (fallback на literal).
func (s *Server) uploadToStoragesvc(ctx context.Context, data []byte) (string, error) {
	if s.storagesvcURL == "" {
		log.Printf("uploadToStoragesvc: storagesvcURL is empty, skip upload")
		return "", nil
	}
	log.Printf("uploadToStoragesvc: uploading %d bytes to %s", len(data), s.storagesvcURL)
	uploadURL := strings.TrimRight(s.storagesvcURL, "/") + "/v1/archive"
	body := &bytes.Reader{}
	// multipart/form-data с полем uploadfile
	var buf bytes.Buffer
	boundary := fmt.Sprintf("fission%d", time.Now().UnixNano())
	buf.WriteString("--" + boundary + "\r\n")
	buf.WriteString(fmt.Sprintf("Content-Disposition: form-data; name=\"uploadfile\"; filename=\"archive.zip\"\r\n"))
	buf.WriteString("Content-Type: application/octet-stream\r\n\r\n")
	buf.Write(data)
	buf.WriteString("\r\n--" + boundary + "--\r\n")
	body = bytes.NewReader(buf.Bytes())

	req, err := http.NewRequestWithContext(ctx, http.MethodPost, uploadURL, body)
	if err != nil {
		return "", fmt.Errorf("build storagesvc upload request: %w", err)
	}
	req.Header.Set("Content-Type", "multipart/form-data; boundary="+boundary)
	req.Header.Set("X-File-Size", fmt.Sprintf("%d", len(data)))

	resp, err := s.http.Do(req)
	if err != nil {
		return "", fmt.Errorf("storagesvc upload: %w", err)
	}
	defer resp.Body.Close()
	respBody, _ := io.ReadAll(resp.Body)
	if resp.StatusCode != http.StatusOK && resp.StatusCode != http.StatusCreated {
		return "", fmt.Errorf("storagesvc upload status %d: %s", resp.StatusCode, strings.TrimSpace(string(respBody)))
	}
	var result struct {
		ID string `json:"id"`
	}
	if err := json.Unmarshal(respBody, &result); err != nil || result.ID == "" {
		return "", fmt.Errorf("storagesvc upload: bad response: %s", string(respBody))
	}
	archiveURL := strings.TrimRight(s.storagesvcURL, "/") + "/v1/archive?id=" + result.ID
	return archiveURL, nil
}

// buildDeploySpec строит spec.deployment для Fission Package.
// Если storagesvcURL задан — загружает архив в S3 через storagesvc и возвращает type: url.
// Иначе — возвращает type: literal с base64-кодом.
func (s *Server) buildDeploySpec(ctx context.Context, data []byte) (map[string]any, error) {
	archiveURL, err := s.uploadToStoragesvc(ctx, data)
	if err != nil {
		log.Printf("storagesvc upload failed, falling back to literal: %v", err)
		// fallback — сохраняем как literal
		return map[string]any{"type": "literal", "literal": base64.StdEncoding.EncodeToString(data)}, nil
	}
	if archiveURL == "" {
		return map[string]any{"type": "literal", "literal": base64.StdEncoding.EncodeToString(data)}, nil
	}
	return map[string]any{"type": "url", "url": archiveURL}, nil
}

func (s *Server) resolveInvokeTimeout(fn *unstructured.Unstructured) time.Duration {
	if fn != nil {
		seconds, found, err := unstructured.NestedInt64(fn.Object, "spec", "functionTimeout")
		if err == nil && found && seconds > 0 {
			return time.Duration(seconds) * time.Second
		}
	}
	if s.invokeTimeout > 0 {
		return s.invokeTimeout
	}
	return defaultFunctionInvokeTimeout
}

func normalizeFunctionTimeout(seconds int64) int64 {
	if seconds <= 0 {
		return int64(defaultFunctionInvokeTimeout / time.Second)
	}
	return seconds
}

func normalizeRoute(route string) string {
	route = strings.TrimSpace(route)
	if route == "" || route == "/" {
		return "/"
	}
	if !strings.HasPrefix(route, "/") {
		return "/" + route
	}
	return route
}

func routeAllowsMethod(methods []string, method string) bool {
	if len(methods) == 0 {
		return true
	}
	for _, candidate := range methods {
		if strings.EqualFold(strings.TrimSpace(candidate), method) {
			return true
		}
	}
	return false
}

func appendUniqueMethods(dst []string, src []string) []string {
	for _, method := range src {
		method = strings.ToUpper(strings.TrimSpace(method))
		if method == "" {
			continue
		}
		seen := false
		for _, existing := range dst {
			if existing == method {
				seen = true
				break
			}
		}
		if !seen {
			dst = append(dst, method)
		}
	}
	return dst
}

func shouldForwardRequestBody(method string) bool {
	switch method {
	case http.MethodGet, http.MethodHead:
		return false
	default:
		return true
	}
}

func copyProxyRequestHeaders(dst, src http.Header) {
	for key, values := range src {
		switch http.CanonicalHeaderKey(key) {
		case "Authorization", "X-Auth-Token", "X-Auth-Env", "Host", "Content-Length":
			continue
		}
		for _, value := range values {
			dst.Add(key, value)
		}
	}
}

func copyProxyResponseHeaders(dst, src http.Header) {
	for key, values := range src {
		for _, value := range values {
			dst.Add(key, value)
		}
	}
}

func doRequestWithContextTimeout(client *http.Client, req *http.Request) (*http.Response, error) {
	if client == nil {
		return http.DefaultClient.Do(req)
	}
	invokeClient := *client
	// Для invoke реальный лимит должен определяться context timeout функции,
	// а не общим HTTP timeout console.
	invokeClient.Timeout = 0
	return invokeClient.Do(req)
}

// handleFunctionsRoot обрабатывает запросы к /console/api/functions без имени функции.
// GET → список всех функций, POST → создать новую.
func (s *Server) handleFunctionsRoot(w http.ResponseWriter, r *http.Request) {
	switch r.Method {
	case http.MethodGet:
		s.handleList(fission.FunctionGVR)(w, r)
	case http.MethodPost:
		s.handleCreateFunction(w, r)
	default:
		http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
	}
}

// handleFunctionsAction обрабатывает запросы к /console/api/functions/:name[/action].
// Парсит имя функции и опциональный sub-path ("code", "invoke").
func (s *Server) handleFunctionsAction(w http.ResponseWriter, r *http.Request) {
	// Убираем оба возможных префикса (legacy /api/ и основной /console/api/)
	path := strings.TrimPrefix(r.URL.Path, "/api/functions/")
	if path == r.URL.Path {
		path = strings.TrimPrefix(r.URL.Path, "/console/api/functions/")
	}
	path = strings.Trim(path, "/")
	if path == "" {
		http.NotFound(w, r)
		return
	}

	parts := strings.Split(path, "/")
	name := strings.TrimSpace(parts[0])
	if name == "" {
		writeJSONError(w, http.StatusBadRequest, "function name is required")
		return
	}

	if len(parts) == 1 {
		// /functions/:name — CRUD операции с конкретной функцией
		switch r.Method {
		case http.MethodGet:
			s.handleGetFunction(w, r, name)
		case http.MethodDelete:
			s.handleDeleteFunction(w, r, name)
		default:
			http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
		}
		return
	}

	// /functions/:name/code — обновление кода
	if len(parts) == 2 && parts[1] == "code" && r.Method == http.MethodPut {
		s.handleUpdateFunctionCode(w, r, name)
		return
	}

	// /functions/:name/invoke — вызов функции
	if len(parts) == 2 && parts[1] == "invoke" && r.Method == http.MethodPost {
		s.handleInvokeFunction(w, r, name)
		return
	}

	http.NotFound(w, r)
}

// handleCreateFunction создаёт новую функцию: Package + Function + HTTPTrigger.
//
// Порядок создания: Package → Function → HTTPTrigger.
// При ошибке на любом шаге откатываем уже созданные объекты (best-effort).
// TTL парсится ДО создания объектов — невалидный TTL не оставляет мусор.
func (s *Server) handleCreateFunction(w http.ResponseWriter, r *http.Request) {
	ns := s.userNS(r)

	var req model.CreateFunctionRequest
	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		writeJSONError(w, http.StatusBadRequest, fmt.Sprintf("decode request: %v", err))
		return
	}

	// Гарантируем namespace — на случай прямого вызова API без handleAuth
	nsCtx, nsCancel := context.WithTimeout(r.Context(), 60*time.Second)
	defer nsCancel()
	if err := s.nsManager.EnsureUserNS(nsCtx, ns); err != nil {
		writeJSONError(w, http.StatusBadGateway, fmt.Sprintf("ensure namespace: %v", err))
		return
	}

	req.Name = strings.TrimSpace(req.Name)
	req.Language = strings.TrimSpace(req.Language)
	req.Environment = strings.TrimSpace(req.Environment)
	req.Code = strings.TrimSpace(req.Code)
	req.Entrypoint = strings.TrimSpace(req.Entrypoint)
	req.Route = strings.TrimSpace(req.Route)

	// Валидация имени
	if req.Name != "" && (!validFuncName.MatchString(req.Name) || len(req.Name) > 57) {
		writeJSONError(w, http.StatusBadRequest, "invalid function name: must match ^[a-z0-9]([a-z0-9-]*[a-z0-9])?$ and be <= 57 chars")
		return
	}
	if len(req.Code) > maxCodeSize {
		writeJSONError(w, http.StatusBadRequest, "code exceeds 1MB limit")
		return
	}

	// Lazy создание Environment по языку (если язык указан явно)
	if req.Language != "" {
		envCtx, envCancel := context.WithTimeout(r.Context(), 15*time.Second)
		defer envCancel()
		envName, err := fission.EnsureEnvironment(envCtx, s.dyn, ns, req.Language)
		if err != nil {
			if strings.Contains(err.Error(), "unsupported language") {
				writeJSONError(w, http.StatusBadRequest, err.Error())
			} else {
				writeJSONError(w, http.StatusBadGateway, fmt.Sprintf("ensure environment: %v", err))
			}
			return
		}
		req.Environment = envName
	}

	if req.Name == "" || req.Environment == "" || req.Code == "" {
		writeJSONError(w, http.StatusBadRequest, "name, environment/language and code are required")
		return
	}
	if req.Entrypoint == "" {
		req.Entrypoint = runtime.DefaultEntrypoint(req.Language)
	}
	if req.Route == "" {
		// Namespace-prefix route: избегаем коллизий между пользователями
		// (разные пользователи могут создать функцию с одинаковым именем)
		nsShort := ns
		if len(nsShort) > 12 {
			nsShort = nsShort[len(nsShort)-12:]
		}
		req.Route = "/" + nsShort + "/" + req.Name
	}
	if !strings.HasPrefix(req.Route, "/") {
		req.Route = "/" + req.Route
	}
	req.Methods = normalizeMethods(req.Methods)
	req.Timeout = normalizeFunctionTimeout(req.Timeout)

	ctx, cancel := context.WithTimeout(r.Context(), 20*time.Second)
	defer cancel()

	// Проверяем что environment существует (мог быть задан явно без language)
	if _, err := s.dyn.Resource(fission.EnvironmentGVR).Namespace(ns).Get(ctx, req.Environment, metav1.GetOptions{}); err != nil {
		writeJSONError(w, http.StatusBadRequest, fmt.Sprintf("environment %q not found: %v", req.Environment, err))
		return
	}

	pkgName := req.Name + "-pkg"
	triggerName := req.Name + "-route"

	methodValues := make([]any, 0, len(req.Methods))
	for _, method := range req.Methods {
		methodValues = append(methodValues, method)
	}

	// Строим Package spec в зависимости от языка:
	// - Go: source package → builder job компилирует в .so плагин
	// - Node.js: deployment zip с ESM wrapper (package.json + main.js)
	// - Остальные: deployment archive с кодом (S3 или literal fallback)
	var pkgSpec map[string]any
	if req.Language == "go" {
		srcZip, err := runtime.BuildGoSourceZip(req.Code)
		if err != nil {
			writeJSONError(w, http.StatusBadRequest, fmt.Sprintf("build go source archive: %v", err))
			return
		}
		srcSpec, srcErr := s.buildDeploySpec(ctx, srcZip)
		if srcErr != nil {
			writeJSONError(w, http.StatusInternalServerError, fmt.Sprintf("upload go source: %v", srcErr))
			return
		}
		pkgSpec = map[string]any{
			"source":       srcSpec,
			"deployment":   map[string]any{},
			"environment":  map[string]any{"name": req.Environment, "namespace": ns},
			"buildcommand": "build",
		}
	} else {
		deployBytes, archiveErr := buildDeployArchive(req.Language, req.Code)
		if archiveErr != nil {
			writeJSONError(w, http.StatusInternalServerError, fmt.Sprintf("build %s archive: %v", req.Language, archiveErr))
			return
		}
		deploySpec, uploadErr := s.buildDeploySpec(ctx, deployBytes)
		if uploadErr != nil {
			writeJSONError(w, http.StatusInternalServerError, fmt.Sprintf("upload %s archive: %v", req.Language, uploadErr))
			return
		}
		pkgSpec = map[string]any{
			"deployment":  deploySpec,
			"environment": map[string]any{"name": req.Environment, "namespace": ns},
			"source":      map[string]any{},
		}
	}

	pkg := &unstructured.Unstructured{Object: map[string]any{
		"apiVersion": "fission.io/v1",
		"kind":       "Package",
		"metadata":   map[string]any{"name": pkgName, "namespace": ns},
		"spec":       pkgSpec,
	}}

	// Парсим TTL ДО создания K8s ресурсов — невалидный TTL не оставляет мусор
	fnAnnotations := map[string]any{
		"fission-console/language": req.Language,
	}
	now := time.Now().UTC()
	fnAnnotations[functionCreatedAtAnnotation] = now.Format(time.RFC3339)
	fnAnnotations[functionUpdatedAtAnnotation] = now.Format(time.RFC3339)
	if req.TTL != "" {
		expiresAt, ttlErr := parseTTL(req.TTL)
		if ttlErr != nil {
			writeJSONError(w, http.StatusBadRequest, fmt.Sprintf("invalid ttl %q: %v", req.TTL, ttlErr))
			return
		}
		fnAnnotations["fission-console/expires-at"] = expiresAt.UTC().Format(time.RFC3339)
	}

	if _, err := s.dyn.Resource(fission.PackageGVR).Namespace(ns).Create(ctx, pkg, metav1.CreateOptions{}); err != nil {
		if apierrors.IsAlreadyExists(err) {
			writeJSONError(w, http.StatusConflict, fmt.Sprintf("function %q already exists", req.Name))
			return
		}
		if apierrors.IsInvalid(err) {
			writeJSONError(w, http.StatusBadRequest, fmt.Sprintf("invalid function spec: %v", err))
			return
		}
		writeJSONError(w, http.StatusBadGateway, fmt.Sprintf("create package: %v", err))
		return
	}

	fn := &unstructured.Unstructured{Object: map[string]any{
		"apiVersion": "fission.io/v1",
		"kind":       "Function",
		"metadata":   map[string]any{"name": req.Name, "namespace": ns, "annotations": fnAnnotations},
		"spec": map[string]any{
			"environment":     map[string]any{"name": req.Environment, "namespace": ns},
			"functionTimeout": req.Timeout,
			"InvokeStrategy": map[string]any{
				"ExecutionStrategy": map[string]any{"ExecutorType": "poolmgr"},
				"StrategyType":      "execution",
			},
			"package": map[string]any{
				"packageref":   map[string]any{"name": pkgName, "namespace": ns},
				"functionName": req.Entrypoint,
			},
		},
	}}

	if _, err := s.dyn.Resource(fission.FunctionGVR).Namespace(ns).Create(ctx, fn, metav1.CreateOptions{}); err != nil {
		// Откатываем Package если Function не создалась
		_ = s.dyn.Resource(fission.PackageGVR).Namespace(ns).Delete(ctx, pkgName, metav1.DeleteOptions{})
		if apierrors.IsAlreadyExists(err) {
			writeJSONError(w, http.StatusConflict, fmt.Sprintf("function %q already exists", req.Name))
			return
		}
		writeJSONError(w, http.StatusBadGateway, fmt.Sprintf("create function: %v", err))
		return
	}

	httpTrigger := &unstructured.Unstructured{Object: map[string]any{
		"apiVersion": "fission.io/v1",
		"kind":       "HTTPTrigger",
		"metadata":   map[string]any{"name": triggerName, "namespace": ns},
		"spec": map[string]any{
			"relativeurl":   req.Route,
			"methods":       methodValues,
			"createingress": true,
			"functionref":   map[string]any{"type": "name", "name": req.Name},
		},
	}}

	if _, err := s.dyn.Resource(fission.HTTPTrigGVR).Namespace(ns).Create(ctx, httpTrigger, metav1.CreateOptions{}); err != nil {
		// Откатываем Function и Package
		_ = s.dyn.Resource(fission.FunctionGVR).Namespace(ns).Delete(ctx, req.Name, metav1.DeleteOptions{})
		_ = s.dyn.Resource(fission.PackageGVR).Namespace(ns).Delete(ctx, pkgName, metav1.DeleteOptions{})
		writeJSONError(w, http.StatusBadGateway, fmt.Sprintf("create httptrigger: %v", err))
		return
	}

	writeAnyJSON(w, http.StatusCreated, map[string]any{
		"name":        req.Name,
		"package":     pkgName,
		"httptrigger": triggerName,
		"route":       req.Route,
		"expires_at":  fnAnnotations["fission-console/expires-at"],
	})
}

// handleGetFunction возвращает детали функции: код, environment, route, methods.
func (s *Server) handleGetFunction(w http.ResponseWriter, r *http.Request, name string) {
	ctx, cancel := context.WithTimeout(r.Context(), 10*time.Second)
	defer cancel()
	ns := s.userNS(r)

	fn, err := s.dyn.Resource(fission.FunctionGVR).Namespace(ns).Get(ctx, name, metav1.GetOptions{})
	if err != nil {
		status := http.StatusBadGateway
		if apierrors.IsNotFound(err) {
			status = http.StatusNotFound
		}
		writeJSONError(w, status, fmt.Sprintf("get function %q: %v", name, err))
		return
	}

	packageName, _, _ := unstructured.NestedString(fn.Object, "spec", "package", "packageref", "name")
	environment, _, _ := unstructured.NestedString(fn.Object, "spec", "environment", "name")
	entrypoint, _, _ := unstructured.NestedString(fn.Object, "spec", "package", "functionName")
	functionTimeout, foundTimeout, _ := unstructured.NestedInt64(fn.Object, "spec", "functionTimeout")
	if !foundTimeout || functionTimeout <= 0 {
		functionTimeout = int64(defaultFunctionInvokeTimeout / time.Second)
	}

	// Извлекаем исходный код из Package (пробуем source.literal, потом deployment.literal, потом url)
	code := ""
	if packageName != "" {
		pkg, pkgErr := s.dyn.Resource(fission.PackageGVR).Namespace(ns).Get(ctx, packageName, metav1.GetOptions{})
		if pkgErr == nil {
			code = extractPackageSourceCode(ctx, s, pkg)
		}
	}

	// Ищем HTTPTrigger для получения route и methods
	route := ""
	methods := []string{}
	triggers, trigErr := s.dyn.Resource(fission.HTTPTrigGVR).Namespace(ns).List(ctx, metav1.ListOptions{})
	if trigErr == nil {
		for _, trig := range triggers.Items {
			refName, _, _ := unstructured.NestedString(trig.Object, "spec", "functionref", "name")
			if refName != name {
				continue
			}
			route, _, _ = unstructured.NestedString(trig.Object, "spec", "relativeurl")
			methods, _, _ = unstructured.NestedStringSlice(trig.Object, "spec", "methods")
			break
		}
	}

	writeAnyJSON(w, http.StatusOK, map[string]any{
		"name":        name,
		"namespace":   ns,
		"environment": environment,
		"package":     packageName,
		"entrypoint":  entrypoint,
		"timeout":     functionTimeout,
		"created_at":  functionTimestampResponse(fn)["created_at"],
		"updated_at":  functionTimestampResponse(fn)["updated_at"],
		"code":        code,
		"route":       route,
		"methods":     methods,
		"raw":         fn.Object,
	})
}

// handleUpdateFunctionCode обновляет код уже существующей функции.
// Создаёт НОВЫЙ Package (вместо обновления старого) чтобы executor сбросил кэш:
// executor кэширует function service по functionUid и не видит изменений в том же Package.
// Новое имя пакета гарантирует cache miss в executor.
func (s *Server) handleUpdateFunctionCode(w http.ResponseWriter, r *http.Request, name string) {
	var req model.UpdateCodeRequest
	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		writeJSONError(w, http.StatusBadRequest, fmt.Sprintf("decode request: %v", err))
		return
	}
	req.Code = strings.TrimSpace(req.Code)
	if req.Code == "" {
		writeJSONError(w, http.StatusBadRequest, "code is required")
		return
	}

	ctx, cancel := context.WithTimeout(r.Context(), 20*time.Second)
	defer cancel()
	ns := s.userNS(r)

	fn, err := s.dyn.Resource(fission.FunctionGVR).Namespace(ns).Get(ctx, name, metav1.GetOptions{})
	if err != nil {
		status := http.StatusBadGateway
		if apierrors.IsNotFound(err) {
			status = http.StatusNotFound
		}
		writeJSONError(w, status, fmt.Sprintf("get function %q: %v", name, err))
		return
	}

	oldPkgName, _, _ := unstructured.NestedString(fn.Object, "spec", "package", "packageref", "name")

	// Определяем язык из аннотации — нужен для правильной упаковки
	lang, _, _ := unstructured.NestedString(fn.Object, "metadata", "annotations", "fission-console/language")
	deployBytes, archiveErr := buildDeployArchive(lang, req.Code)
	if archiveErr != nil {
		writeJSONError(w, http.StatusInternalServerError, fmt.Sprintf("build %s archive: %v", lang, archiveErr))
		return
	}

	// Создаём новый Package с уникальным именем.
	// Это единственный способ сбросить кэш executor: он кэширует по functionUid и
	// не замечает изменений в существующем Package.
	envName, _, _ := unstructured.NestedString(fn.Object, "spec", "environment", "name")
	createdAt := func() time.Time {
		ann := fn.GetAnnotations()
		if ann != nil {
			if v := strings.TrimSpace(ann[functionCreatedAtAnnotation]); v != "" {
				if ts, err := parseRFC3339(v); err == nil {
					return ts.UTC()
				}
			}
		}
		if ts := fn.GetCreationTimestamp(); !ts.IsZero() {
			return ts.UTC()
		}
		return time.Time{}
	}()
	now := time.Now().UTC()
	newPkgName := name + "-pkg-" + strconv.FormatInt(time.Now().UnixMilli(), 36)
	deploySpec, uploadErr := s.buildDeploySpec(ctx, deployBytes)
	if uploadErr != nil {
		writeJSONError(w, http.StatusInternalServerError, fmt.Sprintf("upload %s archive: %v", lang, uploadErr))
		return
	}
	newPkg := &unstructured.Unstructured{Object: map[string]any{
		"apiVersion": "fission.io/v1",
		"kind":       "Package",
		"metadata":   map[string]any{"name": newPkgName, "namespace": ns},
		"spec": map[string]any{
			"deployment":  deploySpec,
			"environment": map[string]any{"name": envName, "namespace": ns},
			"source":      map[string]any{},
		},
	}}

	createdPkg, err := s.dyn.Resource(fission.PackageGVR).Namespace(ns).Create(ctx, newPkg, metav1.CreateOptions{})
	if err != nil {
		writeJSONError(w, http.StatusBadGateway, fmt.Sprintf("create new package: %v", err))
		return
	}

	// Обновляем Function на новый Package
	if err := unstructured.SetNestedField(fn.Object, normalizeFunctionTimeout(req.Timeout), "spec", "functionTimeout"); err != nil {
		writeJSONError(w, http.StatusInternalServerError, fmt.Sprintf("set function timeout: %v", err))
		_ = s.dyn.Resource(fission.PackageGVR).Namespace(ns).Delete(ctx, newPkgName, metav1.DeleteOptions{})
		return
	}
	ensureFunctionTimestamps(fn, now)
	if createdAt.IsZero() {
		createdAt = now
	}
	fnAnnotations := fn.GetAnnotations()
	if fnAnnotations == nil {
		fnAnnotations = map[string]string{}
	}
	fnAnnotations[functionCreatedAtAnnotation] = createdAt.UTC().Format(time.RFC3339)
	fnAnnotations[functionUpdatedAtAnnotation] = now.Format(time.RFC3339)
	fn.SetAnnotations(fnAnnotations)
	if err := unstructured.SetNestedField(fn.Object, map[string]any{
		"name":            newPkgName,
		"namespace":       ns,
		"resourceversion": createdPkg.GetResourceVersion(),
	}, "spec", "package", "packageref"); err != nil {
		writeJSONError(w, http.StatusInternalServerError, fmt.Sprintf("set function packageref: %v", err))
		_ = s.dyn.Resource(fission.PackageGVR).Namespace(ns).Delete(ctx, newPkgName, metav1.DeleteOptions{})
		return
	}
	if _, err := s.dyn.Resource(fission.FunctionGVR).Namespace(ns).Update(ctx, fn, metav1.UpdateOptions{}); err != nil {
		writeJSONError(w, http.StatusBadGateway, fmt.Sprintf("update function %q: %v", name, err))
		_ = s.dyn.Resource(fission.PackageGVR).Namespace(ns).Delete(ctx, newPkgName, metav1.DeleteOptions{})
		return
	}

	// Удаляем старый Package (best effort)
	if oldPkgName != "" && oldPkgName != newPkgName {
		_ = s.dyn.Resource(fission.PackageGVR).Namespace(ns).Delete(ctx, oldPkgName, metav1.DeleteOptions{})
	}

	writeAnyJSON(w, http.StatusOK, map[string]any{
		"updated": true,
		"package": newPkgName,
	})
}

// handleInvokeFunction вызывает функцию через Fission router.
// Определяет реальный URL из HTTPTrigger, выбирает метод (POST/GET).
func (s *Server) handleInvokeFunction(w http.ResponseWriter, r *http.Request, name string) {
	bodyBytes, err := io.ReadAll(r.Body)
	if err != nil {
		writeJSONError(w, http.StatusBadRequest, fmt.Sprintf("read request body: %v", err))
		return
	}
	if len(bytes.TrimSpace(bodyBytes)) == 0 {
		bodyBytes = []byte("{}")
	}

	ns := s.userNS(r)
	lookupCtx, lookupCancel := context.WithTimeout(r.Context(), 10*time.Second)
	defer lookupCancel()

	// Проверяем существование функции до вызова — лучше 404 чем непонятный timeout
	fn, err2 := s.dyn.Resource(fission.FunctionGVR).Namespace(ns).Get(lookupCtx, name, metav1.GetOptions{})
	if err2 != nil {
		if apierrors.IsNotFound(err2) {
			writeJSONError(w, http.StatusNotFound, fmt.Sprintf("function %q not found", name))
			return
		}
		writeJSONError(w, http.StatusBadGateway, fmt.Sprintf("get function %q: %v", name, err2))
		return
	}

	invokeTimeout := s.resolveInvokeTimeout(fn)
	ctx, cancel := context.WithTimeout(r.Context(), invokeTimeout)
	defer cancel()

	// Ищем HTTPTrigger чтобы получить реальный URL и метод
	invokeURL := buildInternalInvokeURL(s.routerURL, ns, name)
	invokeMethod := http.MethodPost
	triggers, err := s.dyn.Resource(fission.HTTPTrigGVR).Namespace(ns).List(ctx, metav1.ListOptions{})
	if err == nil {
		for _, trig := range triggers.Items {
			refName, _, _ := unstructured.NestedString(trig.Object, "spec", "functionref", "name")
			if refName != name {
				continue
			}
			route, _, _ := unstructured.NestedString(trig.Object, "spec", "relativeurl")
			methods, _, _ := unstructured.NestedStringSlice(trig.Object, "spec", "methods")
			hasPost, hasGet := false, false
			for _, m := range methods {
				switch strings.ToUpper(strings.TrimSpace(m)) {
				case http.MethodPost:
					hasPost = true
				case http.MethodGet:
					hasGet = true
				}
			}
			if route != "" {
				if !strings.HasPrefix(route, "/") {
					route = "/" + route
				}
				invokeURL = s.routerURL + route
				// Если функция поддерживает только GET — используем GET
				if !hasPost && hasGet {
					invokeMethod = http.MethodGet
				}
				break
			}
		}
	}

	start := time.Now()
	var invokeBody io.Reader
	if invokeMethod == http.MethodPost {
		invokeBody = bytes.NewReader(bodyBytes)
	}

	req, err := http.NewRequestWithContext(ctx, invokeMethod, invokeURL, invokeBody)
	if err != nil {
		writeJSONError(w, http.StatusInternalServerError, fmt.Sprintf("build invoke request: %v", err))
		return
	}
	if invokeMethod == http.MethodPost {
		req.Header.Set("Content-Type", "application/json")
	}
	if token := s.getRouterToken(); token != "" {
		req.Header.Set("Authorization", "Bearer "+token)
	}

	resp, err := doRequestWithContextTimeout(s.http, req)
	if err != nil {
		// Отличаем timeout от сетевой ошибки.
		if errors.Is(err, context.DeadlineExceeded) {
			writeJSONError(w, http.StatusBadGateway, fmt.Sprintf("invoke %q timeout after %s", name, invokeTimeout))
			return
		}
		var netErr net.Error
		if errors.As(err, &netErr) && netErr.Timeout() {
			writeJSONError(w, http.StatusBadGateway, fmt.Sprintf("invoke %q timeout after %s", name, invokeTimeout))
			return
		}
		writeJSONError(w, http.StatusBadGateway, fmt.Sprintf("invoke %q: %v", name, err))
		return
	}
	defer resp.Body.Close()

	respBody, _ := io.ReadAll(resp.Body)
	writeAnyJSON(w, http.StatusOK, map[string]any{
		"status":       resp.StatusCode,
		"latency_ms":   time.Since(start).Milliseconds(),
		"invoke_url":   invokeURL,
		"response_raw": string(respBody),
	})
}

func buildInternalInvokeURL(routerURL, namespace, functionName string) string {
	if namespace == "default" || namespace == "" {
		return fmt.Sprintf("%s/fission-function/%s", routerURL, functionName)
	}
	return fmt.Sprintf("%s/fission-function/%s/%s", routerURL, namespace, functionName)
}

// handleFissionFunctionGateway принимает внутренние invoke-запросы timer/router
// и проксирует их через console в upstream router с корректным router JWT.
func (s *Server) handleFissionFunctionGateway(w http.ResponseWriter, r *http.Request) {
	rawPath := strings.Trim(strings.TrimPrefix(r.URL.Path, "/fission-function"), "/")
	if rawPath == "" {
		http.NotFound(w, r)
		return
	}

	parts := strings.Split(rawPath, "/")
	namespace := s.ns
	functionName := ""
	remainingPath := ""

	if len(parts) == 1 {
		functionName = strings.TrimSpace(parts[0])
	} else {
		namespace = strings.TrimSpace(parts[0])
		functionName = strings.TrimSpace(parts[1])
		if len(parts) > 2 {
			remainingPath = "/" + strings.Join(parts[2:], "/")
		}
	}

	if namespace == "" || functionName == "" {
		writeJSONError(w, http.StatusBadRequest, "namespace and function name are required")
		return
	}

	s.invokeInternalFunction(w, r, namespace, functionName, remainingPath)
}

func (s *Server) invokeInternalFunction(w http.ResponseWriter, r *http.Request, namespace, functionName, extraPath string) {
	bodyBytes, err := io.ReadAll(r.Body)
	if err != nil {
		writeJSONError(w, http.StatusBadRequest, fmt.Sprintf("read request body: %v", err))
		return
	}
	if len(bytes.TrimSpace(bodyBytes)) == 0 {
		bodyBytes = []byte("{}")
	}

	lookupCtx, lookupCancel := context.WithTimeout(r.Context(), 10*time.Second)
	defer lookupCancel()

	fn, err := s.dyn.Resource(fission.FunctionGVR).Namespace(namespace).Get(lookupCtx, functionName, metav1.GetOptions{})
	if err != nil {
		if apierrors.IsNotFound(err) {
			writeJSONError(w, http.StatusNotFound, fmt.Sprintf("function %q not found", functionName))
			return
		}
		writeJSONError(w, http.StatusBadGateway, fmt.Sprintf("get function %q: %v", functionName, err))
		return
	}

	invokeTimeout := s.resolveInvokeTimeout(fn)
	ctx, cancel := context.WithTimeout(r.Context(), invokeTimeout)
	defer cancel()

	invokeURL := buildInternalInvokeURL(s.routerURL, namespace, functionName) + extraPath
	if r.URL.RawQuery != "" {
		invokeURL += "?" + r.URL.RawQuery
	}

	var invokeBody io.Reader
	if shouldForwardRequestBody(r.Method) {
		invokeBody = bytes.NewReader(bodyBytes)
	}

	req, err := http.NewRequestWithContext(ctx, r.Method, invokeURL, invokeBody)
	if err != nil {
		writeJSONError(w, http.StatusInternalServerError, fmt.Sprintf("build invoke request: %v", err))
		return
	}
	if shouldForwardRequestBody(r.Method) {
		req.Header.Set("Content-Type", "application/json")
	}
	copyProxyRequestHeaders(req.Header, r.Header)
	if token := s.getRouterToken(); token != "" {
		req.Header.Set("Authorization", "Bearer "+token)
	}

	start := time.Now()
	resp, err := doRequestWithContextTimeout(s.http, req)
	if err != nil {
		if errors.Is(err, context.DeadlineExceeded) {
			writeJSONError(w, http.StatusBadGateway, fmt.Sprintf("invoke %q timeout after %s", functionName, invokeTimeout))
			return
		}
		var netErr net.Error
		if errors.As(err, &netErr) && netErr.Timeout() {
			writeJSONError(w, http.StatusBadGateway, fmt.Sprintf("invoke %q timeout after %s", functionName, invokeTimeout))
			return
		}
		writeJSONError(w, http.StatusBadGateway, fmt.Sprintf("invoke %q: %v", functionName, err))
		return
	}
	defer resp.Body.Close()

	respBody, _ := io.ReadAll(resp.Body)
	writeAnyJSON(w, http.StatusOK, map[string]any{
		"status":       resp.StatusCode,
		"latency_ms":   time.Since(start).Milliseconds(),
		"invoke_url":   invokeURL,
		"response_raw": string(respBody),
	})
}

// handleInvokeRoute даёт пользователю прямой HTTP gateway к своей функции по route.
// Внешний контракт: /fn/<route> + Authorization: Bearer <user-token>.
func (s *Server) handleInvokeRoute(w http.ResponseWriter, r *http.Request) {
	route := normalizeRoute(strings.TrimPrefix(r.URL.Path, "/fn"))
	if route == "/" {
		writeJSONError(w, http.StatusBadRequest, "route is required")
		return
	}

	ns := s.userNS(r)
	lookupCtx, lookupCancel := context.WithTimeout(r.Context(), 10*time.Second)
	defer lookupCancel()

	triggers, err := s.dyn.Resource(fission.HTTPTrigGVR).Namespace(ns).List(lookupCtx, metav1.ListOptions{})
	if err != nil {
		writeJSONError(w, http.StatusBadGateway, fmt.Sprintf("list httptriggers: %v", err))
		return
	}

	matchedFunction := ""
	allowedMethods := make([]string, 0, 4)
	for _, trig := range triggers.Items {
		trigRoute, _, _ := unstructured.NestedString(trig.Object, "spec", "relativeurl")
		if normalizeRoute(trigRoute) != route {
			continue
		}
		methods, _, _ := unstructured.NestedStringSlice(trig.Object, "spec", "methods")
		allowedMethods = appendUniqueMethods(allowedMethods, methods)
		if !routeAllowsMethod(methods, r.Method) {
			continue
		}
		matchedFunction, _, _ = unstructured.NestedString(trig.Object, "spec", "functionref", "name")
		if matchedFunction != "" {
			break
		}
	}

	if matchedFunction == "" {
		if len(allowedMethods) > 0 {
			w.Header().Set("Allow", strings.Join(allowedMethods, ", "))
			writeJSONError(w, http.StatusMethodNotAllowed, fmt.Sprintf("route %q does not allow method %s", route, r.Method))
			return
		}
		writeJSONError(w, http.StatusNotFound, fmt.Sprintf("route %q not found", route))
		return
	}

	fn, err := s.dyn.Resource(fission.FunctionGVR).Namespace(ns).Get(lookupCtx, matchedFunction, metav1.GetOptions{})
	if err != nil {
		writeJSONError(w, http.StatusBadGateway, fmt.Sprintf("get function %q: %v", matchedFunction, err))
		return
	}

	bodyBytes, err := io.ReadAll(r.Body)
	if err != nil {
		writeJSONError(w, http.StatusBadRequest, fmt.Sprintf("read request body: %v", err))
		return
	}

	invokeTimeout := s.resolveInvokeTimeout(fn)
	ctx, cancel := context.WithTimeout(r.Context(), invokeTimeout)
	defer cancel()

	invokeURL := s.routerURL + route
	if r.URL.RawQuery != "" {
		invokeURL += "?" + r.URL.RawQuery
	}

	var invokeBody io.Reader
	if shouldForwardRequestBody(r.Method) {
		invokeBody = bytes.NewReader(bodyBytes)
	}

	req, err := http.NewRequestWithContext(ctx, r.Method, invokeURL, invokeBody)
	if err != nil {
		writeJSONError(w, http.StatusInternalServerError, fmt.Sprintf("build invoke request: %v", err))
		return
	}
	copyProxyRequestHeaders(req.Header, r.Header)
	if token := s.getRouterToken(); token != "" {
		req.Header.Set("Authorization", "Bearer "+token)
	}

	resp, err := doRequestWithContextTimeout(s.http, req)
	if err != nil {
		if errors.Is(err, context.DeadlineExceeded) {
			writeJSONError(w, http.StatusBadGateway, fmt.Sprintf("invoke route %q timeout after %s", route, invokeTimeout))
			return
		}
		var netErr net.Error
		if errors.As(err, &netErr) && netErr.Timeout() {
			writeJSONError(w, http.StatusBadGateway, fmt.Sprintf("invoke route %q timeout after %s", route, invokeTimeout))
			return
		}
		writeJSONError(w, http.StatusBadGateway, fmt.Sprintf("invoke route %q: %v", route, err))
		return
	}
	defer resp.Body.Close()

	copyProxyResponseHeaders(w.Header(), resp.Header)
	w.WriteHeader(resp.StatusCode)
	_, _ = io.Copy(w, resp.Body)
}

// handleDeleteFunction удаляет функцию и связанные объекты: HTTPTrigger, TimeTrigger, Package.
// После удаления вызывает CleanupEnvironmentIfUnused — убирает environment если язык больше не используется.
func (s *Server) handleDeleteFunction(w http.ResponseWriter, r *http.Request, name string) {
	ctx, cancel := context.WithTimeout(r.Context(), 20*time.Second)
	defer cancel()
	ns := s.userNS(r)

	// Получаем Function чтобы знать pkgName и envName для cleanup
	var pkgName, envName string
	fn, err := s.dyn.Resource(fission.FunctionGVR).Namespace(ns).Get(ctx, name, metav1.GetOptions{})
	if err != nil {
		if apierrors.IsNotFound(err) {
			writeJSONError(w, http.StatusNotFound, fmt.Sprintf("function %q not found", name))
			return
		}
		writeJSONError(w, http.StatusBadGateway, fmt.Sprintf("get function %q: %v", name, err))
		return
	}
	pkgName, _, _ = unstructured.NestedString(fn.Object, "spec", "package", "packageref", "name")
	envName, _, _ = unstructured.NestedString(fn.Object, "spec", "environment", "name")

	// Удаляем связанные HTTPTrigger-ы
	triggers, err := s.dyn.Resource(fission.HTTPTrigGVR).Namespace(ns).List(ctx, metav1.ListOptions{})
	if err == nil {
		for _, trig := range triggers.Items {
			refName, _, _ := unstructured.NestedString(trig.Object, "spec", "functionref", "name")
			if refName == name {
				_ = s.dyn.Resource(fission.HTTPTrigGVR).Namespace(ns).Delete(ctx, trig.GetName(), metav1.DeleteOptions{})
			}
		}
	}

	// Удаляем связанные TimeTrigger-ы
	if triggers, err := s.dyn.Resource(fission.TimeTrigGVR).Namespace(ns).List(ctx, metav1.ListOptions{}); err == nil {
		for _, trig := range triggers.Items {
			refName, _, _ := unstructured.NestedString(trig.Object, "spec", "functionref", "name")
			if refName == name {
				_ = s.dyn.Resource(fission.TimeTrigGVR).Namespace(ns).Delete(ctx, trig.GetName(), metav1.DeleteOptions{})
			}
		}
	}

	if err := s.dyn.Resource(fission.FunctionGVR).Namespace(ns).Delete(ctx, name, metav1.DeleteOptions{}); err != nil && !apierrors.IsNotFound(err) {
		writeJSONError(w, http.StatusBadGateway, fmt.Sprintf("delete function %q: %v", name, err))
		return
	}

	if pkgName != "" {
		// Получаем URL архива из Package spec.deployment перед удалением, чтобы потом очистить S3
		var archiveURL string
		if pkg, pkgErr := s.dyn.Resource(fission.PackageGVR).Namespace(ns).Get(ctx, pkgName, metav1.GetOptions{}); pkgErr == nil {
			deployType, _, _ := unstructured.NestedString(pkg.Object, "spec", "deployment", "type")
			if deployType == "url" {
				archiveURL, _, _ = unstructured.NestedString(pkg.Object, "spec", "deployment", "url")
			}
		}
		if err := s.dyn.Resource(fission.PackageGVR).Namespace(ns).Delete(ctx, pkgName, metav1.DeleteOptions{}); err != nil && !apierrors.IsNotFound(err) {
			writeJSONError(w, http.StatusBadGateway, fmt.Sprintf("delete package %q: %v", pkgName, err))
			return
		}
		// Удаляем архив из S3 после успешного удаления Package (best-effort)
		if archiveURL != "" {
			go s.deleteFromStoragesvc(context.Background(), archiveURL)
		}
	}

	// Убираем environment pool pods если язык больше не используется (best-effort)
	if envName != "" {
		cleanupCtx, cleanupCancel := context.WithTimeout(context.Background(), 15*time.Second)
		defer cleanupCancel()
		fission.CleanupEnvironmentIfUnused(cleanupCtx, s.dyn, ns, envName)
	}

	// (reconciler NS удалён — за FISSION_RESOURCE_NAMESPACES теперь отвечает Layer 1 NSWatcher)

	writeAnyJSON(w, http.StatusOK, map[string]any{"deleted": true, "name": name, "package": pkgName})
}

// handleAuth обрабатывает POST /console/api/auth.
// Валидирует токен через authenticator, создаёт namespace, возвращает namespace + email.
func (s *Server) handleAuth(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodPost {
		writeJSONError(w, http.StatusMethodNotAllowed, "method not allowed")
		return
	}

	var body struct {
		Token string `json:"token"`
		Env   string `json:"env"`
	}
	if err := json.NewDecoder(r.Body).Decode(&body); err != nil || strings.TrimSpace(body.Token) == "" {
		writeJSONError(w, http.StatusBadRequest, "token required")
		return
	}

	env := normalizeEnv(body.Env)

	identity, err := s.authenticator.Authenticate(r.Context(), body.Token, env)
	if err != nil {
		writeJSONError(w, http.StatusUnauthorized, "invalid token")
		return
	}

	ns := auth.NamespaceForSub(identity.Sub)

	ctx, cancel := context.WithTimeout(r.Context(), 60*time.Second)
	defer cancel()
	if ensureErr := s.nsManager.EnsureUserNS(ctx, ns); ensureErr != nil {
		log.Printf("handleAuth: ensureUserNS %s: %v", ns, ensureErr)
	}

	w.Header().Set("Content-Type", "application/json; charset=utf-8")
	_ = json.NewEncoder(w).Encode(map[string]any{"ok": true, "env": env, "namespace": ns, "email": identity.Email})
}

// parseTTL парсит строку TTL и возвращает время истечения.
// Поддерживаемые форматы: Go duration (1h, 30m, 24h) и дни (1d, 7d, 30d).
// Суффикс "d" не поддерживается стандартным time.ParseDuration — обрабатываем отдельно.
func parseTTL(ttl string) (time.Time, error) {
	if strings.HasSuffix(ttl, "d") {
		days, err := strconv.Atoi(strings.TrimSuffix(ttl, "d"))
		if err != nil || days <= 0 {
			return time.Time{}, fmt.Errorf("invalid days value: %q", ttl)
		}
		return time.Now().Add(time.Duration(days) * 24 * time.Hour), nil
	}
	d, err := time.ParseDuration(ttl)
	if err != nil {
		return time.Time{}, err
	}
	if d <= 0 {
		return time.Time{}, fmt.Errorf("ttl must be positive")
	}
	return time.Now().Add(d), nil
}

// normalizeMethods приводит список HTTP методов к верхнему регистру, убирает дубли.
// Если список пустой или все элементы пустые — возвращает ["GET"].
func normalizeMethods(in []string) []string {
	if len(in) == 0 {
		return []string{"GET"}
	}
	out := make([]string, 0, len(in))
	seen := map[string]bool{}
	for _, method := range in {
		m := strings.ToUpper(strings.TrimSpace(method))
		if m == "" || seen[m] {
			continue
		}
		seen[m] = true
		out = append(out, m)
	}
	if len(out) == 0 {
		return []string{"GET"}
	}
	return out
}