baron-sso/backend/internal/handler/dev_handler.go

package handler

import (
	"baron-sso-backend/internal/domain"
	"baron-sso-backend/internal/repository"
	"baron-sso-backend/internal/service"
	"context"
	"crypto/rand"
	"encoding/base64"
	"errors"
	"fmt"
	"log/slog"
	"strings"
	"time"

	"github.com/gofiber/fiber/v2"
	"github.com/google/uuid"
)

type DevHandler struct {
	Hydra       *service.HydraAdminService
	Redis       domain.RedisRepository
	SecretRepo  domain.ClientSecretRepository
	KratosAdmin *service.KratosAdminService
	ConsentRepo repository.ClientConsentRepository
	Keto        service.KetoService
	RPSvc       service.RelyingPartyService
}

func NewDevHandler(redis domain.RedisRepository, secretRepo domain.ClientSecretRepository, consentRepo repository.ClientConsentRepository, rpSvc service.RelyingPartyService, keto service.KetoService) *DevHandler {
	return &DevHandler{
		Hydra:       service.NewHydraAdminService(),
		Redis:       redis,
		SecretRepo:  secretRepo,
		KratosAdmin: service.NewKratosAdminService(),
		ConsentRepo: consentRepo,
		Keto:        keto,
		RPSvc:       rpSvc,
	}
}

type clientSummary struct {
	ID           string                 `json:"id"`
	Name         string                 `json:"name"`
	Type         string                 `json:"type"`
	Status       string                 `json:"status"`
	CreatedAt    *time.Time             `json:"createdAt,omitempty"`
	RedirectURIs []string               `json:"redirectUris"`
	Scopes       []string               `json:"scopes"`
	ClientSecret string                 `json:"clientSecret,omitempty"`
	Metadata     map[string]interface{} `json:"metadata,omitempty"`
}

type clientListResponse struct {
	Items  []clientSummary `json:"items"`
	Limit  int             `json:"limit"`
	Offset int             `json:"offset"`
}

type clientDetailResponse struct {
	Client    clientSummary   `json:"client"`
	Endpoints clientEndpoints `json:"endpoints"`
}

type clientEndpoints struct {
	Discovery     string `json:"discovery"`
	Issuer        string `json:"issuer"`
	Authorization string `json:"authorization"`
	Token         string `json:"token"`
	UserInfo      string `json:"userinfo"`
}

type consentSummary struct {
	Subject         string    `json:"subject"`
	UserName        string    `json:"userName,omitempty"`
	ClientID        string    `json:"clientId"`
	ClientName      string    `json:"clientName,omitempty"`
	GrantedScopes   []string  `json:"grantedScopes"`
	AuthenticatedAt string    `json:"authenticatedAt,omitempty"`
	CreatedAt       time.Time `json:"createdAt"`
	TenantID        string    `json:"tenantId,omitempty"`
	TenantName      string    `json:"tenantName,omitempty"`
}

type consentListResponse struct {
	Items []consentSummary `json:"items"`
}

type clientUpsertRequest struct {
	ID                      *string                 `json:"id"`
	Name                    *string                 `json:"name"`
	Type                    *string                 `json:"type"`
	Status                  *string                 `json:"status"`
	RedirectURIs            *[]string               `json:"redirectUris"`
	Scopes                  *[]string               `json:"scopes"`
	GrantTypes              *[]string               `json:"grantTypes"`
	ResponseTypes           *[]string               `json:"responseTypes"`
	TokenEndpointAuthMethod *string                 `json:"tokenEndpointAuthMethod"`
	Metadata                *map[string]interface{} `json:"metadata"`
}

func (h *DevHandler) checkAppManagerPermission(c *fiber.Ctx) (bool, error) {
	profile, ok := c.Locals("user_profile").(*domain.UserProfileResponse)
	if !ok || profile == nil {
		return false, nil
	}

	// Super Admin bypass
	if profile.Role == domain.RoleSuperAdmin {
		return true, nil
	}

	// Check with Keto: System:AppManager#member
	allowed, err := h.Keto.CheckPermission(c.Context(), profile.ID, "System", "AppManager", "member")
	if err != nil {
		return false, err
	}

	return allowed, nil
}

func (h *DevHandler) ListClients(c *fiber.Ctx) error {
	limit := c.QueryInt("limit", 50)
	offset := c.QueryInt("offset", 0)
	if limit <= 0 {
		limit = 50
	}
	if offset < 0 {
		offset = 0
	}

	isAppManager, err := h.checkAppManagerPermission(c)
	if err != nil {
		slog.Error("Failed to check app manager permission", "error", err)
	}

	clients, err := h.Hydra.ListClients(c.Context(), limit, offset)
	if err != nil {
		if errors.Is(err, service.ErrHydraNotFound) {
			return c.Status(fiber.StatusNotFound).JSON(fiber.Map{"error": "clients not found"})
		}
		errMsg := err.Error()
		if strings.Contains(errMsg, "connection refused") || strings.Contains(errMsg, "dial tcp") {
			return c.Status(fiber.StatusServiceUnavailable).JSON(fiber.Map{
				"error": "Hydra service is unavailable. Please check if Ory Hydra is running.",
			})
		}
		return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{"error": errMsg})
	}

	items := make([]clientSummary, 0, len(clients))
	for _, client := range clients {
		summary := h.mapClientSummary(client)
		// Filter out 'private' clients if user is not an AppManager
		if summary.Type == "private" && !isAppManager {
			continue
		}
		items = append(items, summary)
	}

	return c.JSON(clientListResponse{
		Items:  items,
		Limit:  limit,
		Offset: offset,
	})
}

func (h *DevHandler) GetClient(c *fiber.Ctx) error {
	clientID := c.Params("id")
	if clientID == "" {
		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{"error": "client id is required"})
	}

	client, err := h.Hydra.GetClient(c.Context(), clientID)
	if err != nil {
		if errors.Is(err, service.ErrHydraNotFound) {
			return c.Status(fiber.StatusNotFound).JSON(fiber.Map{"error": "client not found"})
		}
		return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{"error": err.Error()})
	}

	summary := h.mapClientSummary(*client)

	// Check permission for private clients
	if summary.Type == "private" {
		isAppManager, err := h.checkAppManagerPermission(c)
		if err != nil {
			return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{"error": "permission check error"})
		}
		if !isAppManager {
			return c.Status(fiber.StatusForbidden).JSON(fiber.Map{"error": "forbidden: insufficient permissions for private client"})
		}
	}

	return c.JSON(clientDetailResponse{
		Client: summary,
		Endpoints: clientEndpoints{
			Discovery:     strings.TrimRight(h.Hydra.PublicURL, "/") + "/.well-known/openid-configuration",
			Issuer:        h.Hydra.PublicURL,
			Authorization: strings.TrimRight(h.Hydra.PublicURL, "/") + "/oauth2/auth",
			Token:         strings.TrimRight(h.Hydra.PublicURL, "/") + "/oauth2/token",
			UserInfo:      strings.TrimRight(h.Hydra.PublicURL, "/") + "/userinfo",
		},
	})
}

func (h *DevHandler) UpdateClientStatus(c *fiber.Ctx) error {
	clientID := c.Params("id")
	if clientID == "" {
		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{"error": "client id is required"})
	}

	var req struct {
		Status string `json:"status"`
	}
	if err := c.BodyParser(&req); err != nil {
		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{"error": "invalid request body"})
	}

	status := strings.ToLower(strings.TrimSpace(req.Status))
	if status != "active" && status != "inactive" {
		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{"error": "status must be active or inactive"})
	}

	// [Security] Check permission before patching
	current, err := h.Hydra.GetClient(c.Context(), clientID)
	if err == nil {
		summary := h.mapClientSummary(*current)
		if summary.Type == "private" {
			isAppManager, _ := h.checkAppManagerPermission(c)
			if !isAppManager {
				return c.Status(fiber.StatusForbidden).JSON(fiber.Map{"error": "forbidden: insufficient permissions for private client"})
			}
		}
	}

	updated, err := h.Hydra.PatchClientStatus(c.Context(), clientID, status)
	if err != nil {
		if errors.Is(err, service.ErrHydraNotFound) {
			return c.Status(fiber.StatusNotFound).JSON(fiber.Map{"error": "client not found"})
		}
		return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{"error": err.Error()})
	}

	summary := h.mapClientSummary(*updated)
	return c.JSON(clientDetailResponse{
		Client: summary,
		Endpoints: clientEndpoints{
			Discovery:     strings.TrimRight(h.Hydra.PublicURL, "/") + "/.well-known/openid-configuration",
			Issuer:        h.Hydra.PublicURL,
			Authorization: strings.TrimRight(h.Hydra.PublicURL, "/") + "/oauth2/auth",
			Token:         strings.TrimRight(h.Hydra.PublicURL, "/") + "/oauth2/token",
			UserInfo:      strings.TrimRight(h.Hydra.PublicURL, "/") + "/userinfo",
		},
	})
}

func (h *DevHandler) CreateClient(c *fiber.Ctx) error {
	var req clientUpsertRequest
	if err := c.BodyParser(&req); err != nil {
		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{"error": "invalid request body"})
	}

	clientID := strings.TrimSpace(valueOr(req.ID, ""))
	if clientID == "" {
		clientID = uuid.NewString()
	}

	name := strings.TrimSpace(valueOr(req.Name, ""))
	if name == "" {
		name = clientID
	}

	redirectURIs := derefSlice(req.RedirectURIs, nil)
	if len(redirectURIs) == 0 {
		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{"error": "redirectUris is required"})
	}

	scopes := derefSlice(req.Scopes, defaultClientScopes())
	grantTypes := derefSlice(req.GrantTypes, defaultGrantTypes())
	responseTypes := derefSlice(req.ResponseTypes, defaultResponseTypes())

	clientType := strings.ToLower(strings.TrimSpace(valueOr(req.Type, "private")))
	if clientType != "pkce" && clientType != "private" {
		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{"error": "type must be pkce or private"})
	}

	// [Security] Check permission for private clients
	if clientType == "private" {
		isAppManager, err := h.checkAppManagerPermission(c)
		if err != nil {
			return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{"error": "permission check error"})
		}
		if !isAppManager {
			return c.Status(fiber.StatusForbidden).JSON(fiber.Map{"error": "forbidden: insufficient permissions to create private client"})
		}
	}

	status := strings.ToLower(strings.TrimSpace(valueOr(req.Status, "active")))
	if status != "active" && status != "inactive" {
		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{"error": "status must be active or inactive"})
	}

	metadata := mergeMetadata(nil, req.Metadata)
	if metadata == nil {
		metadata = map[string]interface{}{}
	}
	metadata["status"] = status

	tokenAuthMethod := strings.TrimSpace(valueOr(req.TokenEndpointAuthMethod, ""))
	if tokenAuthMethod == "" {
		if clientType == "pkce" {
			tokenAuthMethod = "none"
		} else {
			tokenAuthMethod = "client_secret_basic"
		}
	}

	clientReq := domain.HydraClient{
		ClientID:                clientID,
		ClientName:              name,
		RedirectURIs:            redirectURIs,
		GrantTypes:              grantTypes,
		ResponseTypes:           responseTypes,
		Scope:                   strings.Join(scopes, " "),
		TokenEndpointAuthMethod: tokenAuthMethod,
		Metadata:                metadata,
	}

	created, err := h.Hydra.CreateClient(c.Context(), clientReq)
	if err != nil {
		return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{"error": err.Error()})
	}

	// Store secret in metadata for later retrieval
	if created.ClientSecret != "" {
		// 1. Store in PostgreSQL (Source of Truth)
		if h.SecretRepo != nil {
			_ = h.SecretRepo.Upsert(c.Context(), created.ClientID, created.ClientSecret)
		}

		// 2. Also store in Redis (Cache)
		if h.Redis != nil {
			_ = h.Redis.Set("client_secret:"+created.ClientID, created.ClientSecret, 0)
		}
	}

	summary := h.mapClientSummary(*created)
	return c.Status(fiber.StatusCreated).JSON(clientDetailResponse{
		Client: summary,
		Endpoints: clientEndpoints{
			Discovery:     strings.TrimRight(h.Hydra.PublicURL, "/") + "/.well-known/openid-configuration",
			Issuer:        h.Hydra.PublicURL,
			Authorization: strings.TrimRight(h.Hydra.PublicURL, "/") + "/oauth2/auth",
			Token:         strings.TrimRight(h.Hydra.PublicURL, "/") + "/oauth2/token",
			UserInfo:      strings.TrimRight(h.Hydra.PublicURL, "/") + "/userinfo",
		},
	})
}

func (h *DevHandler) UpdateClient(c *fiber.Ctx) error {
	clientID := strings.TrimSpace(c.Params("id"))
	if clientID == "" {
		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{"error": "client id is required"})
	}

	var req clientUpsertRequest
	if err := c.BodyParser(&req); err != nil {
		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{"error": "invalid request body"})
	}

	current, err := h.Hydra.GetClient(c.Context(), clientID)
	if err != nil {
		if errors.Is(err, service.ErrHydraNotFound) {
			return c.Status(fiber.StatusNotFound).JSON(fiber.Map{"error": "client not found"})
		}
		return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{"error": err.Error()})
	}

	clientType := ""
	if req.Type != nil {
		clientType = strings.ToLower(strings.TrimSpace(*req.Type))
		if clientType != "pkce" && clientType != "private" {
			return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{"error": "type must be pkce or private"})
		}
	}

	// [Security] Check permission for private clients (both current and new type)
	currentSummary := h.mapClientSummary(*current)
	if currentSummary.Type == "private" || clientType == "private" {
		isAppManager, err := h.checkAppManagerPermission(c)
		if err != nil {
			return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{"error": "permission check error"})
		}
		if !isAppManager {
			return c.Status(fiber.StatusForbidden).JSON(fiber.Map{"error": "forbidden: insufficient permissions for private client"})
		}
	}

	status := ""
	if req.Status != nil {
		status = strings.ToLower(strings.TrimSpace(*req.Status))
		if status != "active" && status != "inactive" {
			return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{"error": "status must be active or inactive"})
		}
	}

	tokenAuthMethod := strings.TrimSpace(valueOr(req.TokenEndpointAuthMethod, ""))
	if tokenAuthMethod == "" && clientType != "" {
		if clientType == "pkce" {
			tokenAuthMethod = "none"
		} else {
			tokenAuthMethod = "client_secret_basic"
		}
	}

	if req.RedirectURIs != nil && len(*req.RedirectURIs) == 0 {
		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{"error": "redirectUris cannot be empty"})
	}

	metadata := mergeMetadata(current.Metadata, req.Metadata)
	if status != "" {
		if metadata == nil {
			metadata = map[string]interface{}{}
		}
		metadata["status"] = status
	}

	updated := domain.HydraClient{
		ClientID:                current.ClientID,
		ClientName:              valueOr(req.Name, current.ClientName),
		RedirectURIs:            derefSlice(req.RedirectURIs, current.RedirectURIs),
		GrantTypes:              derefSlice(req.GrantTypes, current.GrantTypes),
		ResponseTypes:           derefSlice(req.ResponseTypes, current.ResponseTypes),
		Scope:                   buildScope(valueOrSlice(req.Scopes, strings.Fields(current.Scope))),
		TokenEndpointAuthMethod: resolveTokenAuthMethod(tokenAuthMethod, current.TokenEndpointAuthMethod),
		Metadata:                metadata,
	}

	updatedClient, err := h.Hydra.UpdateClient(c.Context(), clientID, updated)
	if err != nil {
		if errors.Is(err, service.ErrHydraNotFound) {
			return c.Status(fiber.StatusNotFound).JSON(fiber.Map{"error": "client not found"})
		}
		return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{"error": err.Error()})
	}

	summary := h.mapClientSummary(*updatedClient)
	return c.JSON(clientDetailResponse{
		Client: summary,
		Endpoints: clientEndpoints{
			Discovery:     strings.TrimRight(h.Hydra.PublicURL, "/") + "/.well-known/openid-configuration",
			Issuer:        h.Hydra.PublicURL,
			Authorization: strings.TrimRight(h.Hydra.PublicURL, "/") + "/oauth2/auth",
			Token:         strings.TrimRight(h.Hydra.PublicURL, "/") + "/oauth2/token",
			UserInfo:      strings.TrimRight(h.Hydra.PublicURL, "/") + "/userinfo",
		},
	})
}

func (h *DevHandler) DeleteClient(c *fiber.Ctx) error {
	clientID := strings.TrimSpace(c.Params("id"))
	if clientID == "" {
		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{"error": "client id is required"})
	}

	// [Security] Check permission for private clients
	current, err := h.Hydra.GetClient(c.Context(), clientID)
	if err == nil {
		summary := h.mapClientSummary(*current)
		if summary.Type == "private" {
			isAppManager, _ := h.checkAppManagerPermission(c)
			if !isAppManager {
				return c.Status(fiber.StatusForbidden).JSON(fiber.Map{"error": "forbidden: insufficient permissions for private client"})
			}
		}
	}

	if err := h.Hydra.DeleteClient(c.Context(), clientID); err != nil {
		if errors.Is(err, service.ErrHydraNotFound) {
			return c.Status(fiber.StatusNotFound).JSON(fiber.Map{"error": "client not found"})
		}
		return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{"error": err.Error()})
	}

	// 1. Clean up PostgreSQL
	if h.SecretRepo != nil {
		_ = h.SecretRepo.Delete(c.Context(), clientID)
	}

	// 2. Clean up Redis
	if h.Redis != nil {
		_ = h.Redis.Delete("client_secret:" + clientID)
	}

	return c.SendStatus(fiber.StatusNoContent)
}

func (h *DevHandler) ListConsents(c *fiber.Ctx) error {
	clientID := strings.TrimSpace(c.Query("client_id"))
	if clientID == "" {
		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{"error": "client_id is required"})
	}

	subject := strings.TrimSpace(c.Query("subject"))
	limit := c.QueryInt("limit", 50)
	offset := c.QueryInt("offset", 0)
	if limit <= 0 {
		limit = 50
	}

	// [Isolation] Get admin tenant ID from header or locals
	adminTenantID := c.Get("X-Tenant-ID") // Assume middleware sets this or trusted in dev

	var consents []domain.ClientConsentWithTenantInfo
	var total int64
	var err error

	if subject != "" {
		// Resolve subject if it's email/name (Legacy support)
		if _, err := uuid.Parse(subject); err != nil {
			resolved, _ := h.KratosAdmin.FindIdentityIDByIdentifier(c.Context(), subject)
			if resolved != "" {
				subject = resolved
			}
		}

		// Single user fetch from Hydra (to get latest status) or Local DB
		// Issue says: "List All", so we prefer Local DB for consistency in listing
		// But for a single user, we could still use Hydra.
		// Let's use Local DB to support tenant filtering even for search.
		// For simplicity, we just filter the list later if search is used.
	}

	if adminTenantID != "" {
		consents, total, err = h.ConsentRepo.ListByTenant(c.Context(), clientID, adminTenantID, limit, offset)
	} else {
		consents, total, err = h.ConsentRepo.List(c.Context(), clientID, limit, offset)
	}

	if err != nil {
		return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{"error": err.Error()})
	}

	items := make([]consentSummary, 0, len(consents))
	for _, consent := range consents {
		// Filter by subject if search is active
		if subject != "" && consent.Subject != subject {
			continue
		}

		userName := ""
		identity, err := h.KratosAdmin.GetIdentity(c.Context(), consent.Subject)
		if err == nil && identity != nil {
			if name, ok := identity.Traits["name"].(string); ok {
				userName = name
			} else if email, ok := identity.Traits["email"].(string); ok {
				userName = email
			}
		}

		items = append(items, consentSummary{
			Subject:         consent.Subject,
			UserName:        userName,
			ClientID:        consent.ClientID,
			GrantedScopes:   consent.GrantedScopes,
			AuthenticatedAt: consent.UpdatedAt.Format(time.RFC3339),
			CreatedAt:       consent.CreatedAt,
			TenantID:        consent.TenantID,
			TenantName:      consent.TenantName,
		})
	}

	return c.JSON(fiber.Map{
		"items": items,
		"total": total,
	})
}

func (h *DevHandler) RevokeConsents(c *fiber.Ctx) error {
	subject := strings.TrimSpace(c.Query("subject"))
	if subject == "" {
		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{"error": "subject is required"})
	}
	clientID := strings.TrimSpace(c.Query("client_id"))

	// If subject is not a UUID, try to resolve it as an identifier (email/username)
	if _, err := uuid.Parse(subject); err != nil {
		resolved, err := h.KratosAdmin.FindIdentityIDByIdentifier(c.Context(), subject)
		if err == nil && resolved != "" {
			subject = resolved
		}
	}

	// 1. Revoke in Hydra
	if err := h.Hydra.RevokeConsentSessions(c.Context(), subject, clientID); err != nil {
		return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{"error": err.Error()})
	}

	// 2. Sync to Local DB (Delete)
	if h.ConsentRepo != nil {
		_ = h.ConsentRepo.Delete(c.Context(), subject, clientID)
	}

	return c.SendStatus(fiber.StatusNoContent)
}

func (h *DevHandler) RotateClientSecret(c *fiber.Ctx) error {
	clientID := strings.TrimSpace(c.Params("id"))
	if clientID == "" {
		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{"error": "client id is required"})
	}

	// [Security] Check permission for private clients
	current, err := h.Hydra.GetClient(c.Context(), clientID)
	if err == nil {
		summary := h.mapClientSummary(*current)
		if summary.Type == "private" {
			isAppManager, _ := h.checkAppManagerPermission(c)
			if !isAppManager {
				return c.Status(fiber.StatusForbidden).JSON(fiber.Map{"error": "forbidden: insufficient permissions for private client"})
			}
		}
	}

	// 1. Generate new secret
	newSecret, err := generateRandomSecret(20)
	if err != nil {
		return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{"error": "failed to generate secret"})
	}

	// 2. Get current client to preserve other fields (already fetched above)
	if err != nil {
		if errors.Is(err, service.ErrHydraNotFound) {
			return c.Status(fiber.StatusNotFound).JSON(fiber.Map{"error": "client not found"})
		}
		return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{"error": err.Error()})
	}

	// 3. Update Hydra
	current.ClientSecret = newSecret
	updated, err := h.Hydra.UpdateClient(c.Context(), clientID, *current)
	if err != nil {
		return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{"error": err.Error()})
	}

	// 4. Update Persistence (DB & Redis)
	if h.SecretRepo != nil {
		if err := h.SecretRepo.Upsert(c.Context(), clientID, newSecret); err != nil {
			// Log error but don't fail the request as Hydra is already updated
			fmt.Printf("failed to update secret in repo: %v\n", err)
		}
	}

	if h.Redis != nil {
		_ = h.Redis.Set("client_secret:"+clientID, newSecret, 0)
	}

	// Return the new secret
	summary := h.mapClientSummary(*updated)
	summary.ClientSecret = newSecret

	return c.JSON(clientDetailResponse{
		Client: summary,
		Endpoints: clientEndpoints{
			Discovery:     strings.TrimRight(h.Hydra.PublicURL, "/") + "/.well-known/openid-configuration",
			Issuer:        h.Hydra.PublicURL,
			Authorization: strings.TrimRight(h.Hydra.PublicURL, "/") + "/oauth2/auth",
			Token:         strings.TrimRight(h.Hydra.PublicURL, "/") + "/oauth2/token",
			UserInfo:      strings.TrimRight(h.Hydra.PublicURL, "/") + "/userinfo",
		},
	})
}

func generateRandomSecret(length int) (string, error) {
	bytes := make([]byte, length)
	if _, err := rand.Read(bytes); err != nil {
		return "", err
	}
	// Use Base64 URL encoding (no padding) to look like Hydra's native secrets
	return base64.RawURLEncoding.EncodeToString(bytes), nil
}

func (h *DevHandler) mapClientSummary(client domain.HydraClient) clientSummary {
	status := "active"
	if client.Metadata != nil {
		if value, ok := client.Metadata["status"].(string); ok && strings.ToLower(value) == "inactive" {
			status = "inactive"
		}
	}

	clientType := "private"
	if strings.EqualFold(client.TokenEndpointAuthMethod, "none") {
		clientType = "pkce"
	}

	name := strings.TrimSpace(client.ClientName)
	if name == "" {
		name = client.ClientID
	}

	scopes := strings.Fields(client.Scope)

	clientSecret := client.ClientSecret
	// 1. Check Metadata (Legacy/Fallback)
	if clientSecret == "" && client.Metadata != nil {
		if val, ok := client.Metadata["client_secret"].(string); ok {
			clientSecret = val
		}
	}

	// 2. Check Redis (Cache)
	if clientSecret == "" && h.Redis != nil {
		if val, err := h.Redis.Get("client_secret:" + client.ClientID); err == nil && val != "" {
			clientSecret = val
		}
	}

	// 3. Check PostgreSQL (Source of Truth) & Cache Warming
	if clientSecret == "" && h.SecretRepo != nil {
		if val, err := h.SecretRepo.GetByID(context.Background(), client.ClientID); err == nil && val != "" {
			clientSecret = val
			// Warm up cache
			if h.Redis != nil {
				_ = h.Redis.Set("client_secret:"+client.ClientID, clientSecret, 0)
			}
		}
	}

	return clientSummary{
		ID:           client.ClientID,
		Name:         name,
		Type:         clientType,
		Status:       status,
		RedirectURIs: client.RedirectURIs,
		Scopes:       scopes,
		ClientSecret: clientSecret,
		Metadata:     client.Metadata,
	}
}

func defaultClientScopes() []string {
	return []string{"openid", "profile", "email"}
}

func defaultGrantTypes() []string {
	return []string{"authorization_code", "refresh_token"}
}

func defaultResponseTypes() []string {
	return []string{"code"}
}

func buildScope(scopes []string) string {
	return strings.Join(scopes, " ")
}

func valueOr(ptr *string, fallback string) string {
	if ptr == nil {
		return fallback
	}
	return *ptr
}

func valueOrSlice(ptr *[]string, fallback []string) []string {
	if ptr == nil {
		return fallback
	}
	return *ptr
}

func derefSlice(ptr *[]string, fallback []string) []string {
	if ptr == nil {
		return fallback
	}
	return *ptr
}

func mergeMetadata(current map[string]interface{}, incoming *map[string]interface{}) map[string]interface{} {
	if incoming == nil {
		return current
	}
	merged := map[string]interface{}{}
	for k, v := range current {
		merged[k] = v
	}
	for k, v := range *incoming {
		merged[k] = v
	}
	return merged
}

func resolveTokenAuthMethod(requested, fallback string) string {
	if strings.TrimSpace(requested) == "" {
		return fallback
	}
	return requested
}