popiart-server/internal/server/server.go

package server

import (
	"context"
	"encoding/base64"
	"encoding/json"
	"errors"
	"fmt"
	"io"
	"log"
	"net/http"
	"os"
	"path/filepath"
	"strconv"
	"strings"
	"time"
)

type Server struct {
	store  *store
	mux    *http.ServeMux
	cfg    Config
	newapi *newAPIClient
}

func New() *Server {
	svc, err := NewWithConfig(ConfigFromEnv())
	if err != nil {
		panic(err)
	}
	return svc
}

func NewWithConfig(cfg Config) (*Server, error) {
	cfg = normalizeConfig(cfg)
	store, err := newStore(cfg)
	if err != nil {
		return nil, err
	}
	s := &Server{
		store:  store,
		mux:    http.NewServeMux(),
		cfg:    cfg,
		newapi: newNewAPIClient(cfg),
	}
	s.routes()
	return s, nil
}

func (s *Server) Handler() http.Handler {
	return s.mux
}

func (s *Server) routes() {
	s.mux.HandleFunc("/health", s.handleHealth)
	s.mux.HandleFunc("/v1/auth/login", s.handleAuthLogin)
	s.mux.HandleFunc("/v1/auth/me", s.handleAuthMe)
	s.mux.HandleFunc("/v1/auth/logout", s.handleAuthLogout)
	s.mux.HandleFunc("/v1/auth/token/rotate", s.handleAuthTokenRotate)
	s.mux.HandleFunc("/v1/skills", s.handleSkills)
	s.mux.HandleFunc("/v1/skills/", s.handleSkill)
	s.mux.HandleFunc("/v1/jobs", s.handleJobs)
	s.mux.HandleFunc("/v1/jobs/", s.handleJob)
	s.mux.HandleFunc("/v1/media/upload", s.handleMediaUpload)
	s.mux.HandleFunc("/v1/media/", s.handleMedia)
	s.mux.HandleFunc("/v1/artifacts/upload", s.handleArtifactUpload)
	s.mux.HandleFunc("/v1/artifacts/", s.handleArtifact)
	s.mux.HandleFunc("/v1/budget", s.handleBudget)
	s.mux.HandleFunc("/v1/budget/usage", s.handleBudgetUsage)
	s.mux.HandleFunc("/v1/budget/limits", s.handleBudgetLimits)
	s.mux.HandleFunc("/v1/projects", s.handleProjects)
	s.mux.HandleFunc("/v1/projects/", s.handleProject)
	s.mux.HandleFunc("/v1/models", s.handleModels)
	s.mux.HandleFunc("/v1/models/routes", s.handleModelRoutes)
	s.mux.HandleFunc("/v1/models/routes/overrides", s.handleModelRouteOverrides)
	s.mux.HandleFunc("/v1/models/routes/overrides/unset", s.handleModelRouteOverrideUnset)
	s.mux.HandleFunc("/v1/models/infer", s.handleModelsInfer)
}

func (s *Server) handleHealth(w http.ResponseWriter, r *http.Request) {
	writeJSON(w, http.StatusOK, map[string]any{
		"ok":      true,
		"service": "popiart-server-dev",
		"version": "0.2.0",
		"time":    time.Now().UTC().Format(time.RFC3339),
	})
}

func (s *Server) handleAuthLogin(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodPost {
		methodNotAllowed(w)
		return
	}
	var req struct {
		Key string `json:"key"`
	}
	if !decodeJSON(w, r, &req) {
		return
	}
	req.Key = strings.TrimSpace(req.Key)
	if req.Key == "" {
		writeError(w, http.StatusUnauthorized, "UNAUTHENTICATED", "key is required", nil)
		return
	}
	if s.newapi == nil || !s.newapi.enabled() {
		writeError(w, http.StatusInternalServerError, "SERVER_ERROR", "PopiNewAPI base URL is not configured", nil)
		return
	}
	ctx, cancel := context.WithTimeout(r.Context(), 30*time.Second)
	defer cancel()
	if err := s.newapi.verifyKey(ctx, req.Key); err != nil {
		writeError(w, http.StatusUnauthorized, "UNAUTHENTICATED", "key invalid or expired", map[string]any{
			"details": err.Error(),
		})
		return
	}

	key, u, ok, err := s.store.createSession(req.Key)
	if err != nil {
		writeInternalError(w, "failed to create session", err)
		return
	}
	if !ok {
		writeError(w, http.StatusUnauthorized, "UNAUTHENTICATED", "key invalid or expired", nil)
		return
	}
	writeData(w, http.StatusOK, map[string]any{
		"key":   key,
		"token": key,
		"user":  u,
	})
}

func (s *Server) handleAuthMe(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		methodNotAllowed(w)
		return
	}
	current, ok := s.authenticateSession(w, r)
	if !ok {
		return
	}
	writeData(w, http.StatusOK, authSessionView{
		User:              current.User,
		SessionKey:        current.Token,
		UpstreamKeyMasked: maskSecret(current.UpstreamKey),
	})
}

func (s *Server) handleAuthLogout(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodPost {
		methodNotAllowed(w)
		return
	}
	token, ok := bearerToken(r)
	if ok {
		_ = s.store.deleteSession(token)
	}
	writeData(w, http.StatusOK, map[string]any{"logged_out": true})
}

func (s *Server) handleAuthTokenRotate(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodPost {
		methodNotAllowed(w)
		return
	}
	token, ok := bearerToken(r)
	if !ok {
		writeError(w, http.StatusUnauthorized, "UNAUTHENTICATED", "missing bearer key", nil)
		return
	}
	newToken, u, exists, err := s.store.rotateSession(token)
	if err != nil {
		writeInternalError(w, "failed to rotate session", err)
		return
	}
	if !exists {
		writeError(w, http.StatusUnauthorized, "UNAUTHENTICATED", "key invalid or expired", nil)
		return
	}
	writeData(w, http.StatusOK, map[string]any{
		"key":   newToken,
		"token": newToken,
		"user":  u,
	})
}

func (s *Server) handleSkills(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		methodNotAllowed(w)
		return
	}
	_, ok := s.authenticateSession(w, r)
	if !ok {
		return
	}
	tag := r.URL.Query().Get("tag")
	search := r.URL.Query().Get("search")
	limit := intQuery(r, "limit", 50)
	offset := intQuery(r, "offset", 0)
	items, total := s.store.listSkills(tag, search, limit, offset)
	writeData(w, http.StatusOK, map[string]any{
		"items":  items,
		"total":  total,
		"limit":  limit,
		"offset": offset,
	})
}

func (s *Server) handleSkill(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		methodNotAllowed(w)
		return
	}
	_, ok := s.authenticateSession(w, r)
	if !ok {
		return
	}

	path := strings.TrimPrefix(r.URL.Path, "/v1/skills/")
	if path == "" {
		notFound(w)
		return
	}

	if strings.HasSuffix(path, "/schema") {
		id := strings.TrimSuffix(strings.TrimSuffix(path, "/schema"), "/")
		item, exists := s.store.getSkill(id)
		if !exists {
			notFound(w)
			return
		}
		writeData(w, http.StatusOK, map[string]any{
			"input_schema":  item.InputSchema,
			"output_schema": item.OutputSchema,
		})
		return
	}

	item, exists := s.store.getSkill(strings.Trim(path, "/"))
	if !exists {
		notFound(w)
		return
	}
	writeData(w, http.StatusOK, item)
}

func (s *Server) handleJobs(w http.ResponseWriter, r *http.Request) {
	current, ok := s.authenticateSession(w, r)
	if !ok {
		return
	}

	switch r.Method {
	case http.MethodPost:
		var req struct {
			SkillID        string         `json:"skill_id"`
			Input          map[string]any `json:"input"`
			ProjectID      string         `json:"project_id"`
			Priority       string         `json:"priority"`
			IdempotencyKey string         `json:"idempotency_key"`
		}
		if !decodeJSON(w, r, &req) {
			return
		}
		if req.SkillID == "" {
			writeError(w, http.StatusBadRequest, "VALIDATION_ERROR", "skill_id is required", nil)
			return
		}
		item, exists := s.store.getSkill(req.SkillID)
		if !exists {
			writeError(w, http.StatusNotFound, "NOT_FOUND", "skill not found", nil)
			return
		}
		routeKey := normalizeRouteKey(item.RouteKey)
		modelID := s.resolveModelID(routeKey, req.ProjectID)
		record, statusCode, err := s.store.createJob(
			req.SkillID,
			routeKey,
			modelID,
			routeExecMode(routeKey),
			req.Input,
			req.ProjectID,
			defaultString(req.Priority, "normal"),
			req.IdempotencyKey,
			current,
		)
		if err != nil {
			writeInternalError(w, "failed to create job", err)
			return
		}
		if statusCode == http.StatusAccepted {
			go s.dispatchJob(record)
		}
		writeData(w, statusCode, map[string]any{
			"job_id":     record.JobID,
			"status":     record.Status,
			"created_at": record.CreatedAt,
		})
	case http.MethodGet:
		status := r.URL.Query().Get("status")
		skillID := r.URL.Query().Get("skill_id")
		projectID := r.URL.Query().Get("project_id")
		limit := intQuery(r, "limit", 20)
		offset := intQuery(r, "offset", 0)
		items, total, err := s.store.listJobs(current.User.ID, status, skillID, projectID, limit, offset)
		if err != nil {
			writeInternalError(w, "failed to list jobs", err)
			return
		}
		writeData(w, http.StatusOK, map[string]any{
			"items":  items,
			"total":  total,
			"limit":  limit,
			"offset": offset,
		})
	default:
		methodNotAllowed(w)
	}
}

func (s *Server) handleJob(w http.ResponseWriter, r *http.Request) {
	current, ok := s.authenticateSession(w, r)
	if !ok {
		return
	}

	path := strings.TrimPrefix(r.URL.Path, "/v1/jobs/")
	parts := strings.Split(strings.Trim(path, "/"), "/")
	if len(parts) == 0 || parts[0] == "" {
		notFound(w)
		return
	}
	jobID := parts[0]

	if len(parts) == 1 && r.Method == http.MethodGet {
		record, exists, err := s.store.getJob(current.User.ID, jobID)
		if err != nil {
			writeInternalError(w, "failed to load job", err)
			return
		}
		if !exists {
			notFound(w)
			return
		}
		writeData(w, http.StatusOK, record)
		return
	}

	if len(parts) == 2 && parts[1] == "cancel" && r.Method == http.MethodPost {
		record, exists, conflict, err := s.store.cancelJob(current.User.ID, jobID)
		if err != nil {
			writeInternalError(w, "failed to cancel job", err)
			return
		}
		if !exists {
			notFound(w)
			return
		}
		if conflict {
			writeError(w, http.StatusConflict, "CONFLICT", "job already in terminal state", nil)
			return
		}
		writeData(w, http.StatusOK, record)
		return
	}

	if len(parts) == 2 && parts[1] == "logs" && r.Method == http.MethodGet {
		logs, exists, err := s.store.jobLogs(current.User.ID, jobID)
		if err != nil {
			writeInternalError(w, "failed to load job logs", err)
			return
		}
		if !exists {
			notFound(w)
			return
		}
		if strings.Contains(r.Header.Get("Accept"), "text/event-stream") {
			w.Header().Set("Content-Type", "text/event-stream")
			w.Header().Set("Cache-Control", "no-cache")
			flusher, _ := w.(http.Flusher)
			for _, item := range logs {
				fmt.Fprintf(w, "data: %s\n\n", mustJSON(item))
				if flusher != nil {
					flusher.Flush()
				}
				time.Sleep(150 * time.Millisecond)
			}
			return
		}
		writeData(w, http.StatusOK, logs)
		return
	}

	if len(parts) == 2 && parts[1] == "artifacts" && r.Method == http.MethodGet {
		items, exists, err := s.store.artifactsForJob(current.User.ID, jobID)
		if err != nil {
			writeInternalError(w, "failed to list job artifacts", err)
			return
		}
		if !exists {
			notFound(w)
			return
		}
		writeData(w, http.StatusOK, map[string]any{"items": items})
		return
	}

	notFound(w)
}

func (s *Server) handleArtifactUpload(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodPost {
		methodNotAllowed(w)
		return
	}
	current, ok := s.authenticateSession(w, r)
	if !ok {
		return
	}

	r.Body = http.MaxBytesReader(w, r.Body, 20<<20)
	if err := r.ParseMultipartForm(20 << 20); err != nil {
		writeError(w, http.StatusBadRequest, "VALIDATION_ERROR", "failed to parse multipart form", map[string]any{
			"details": err.Error(),
		})
		return
	}

	file, header, err := r.FormFile("file")
	if err != nil {
		writeError(w, http.StatusBadRequest, "VALIDATION_ERROR", "file is required", nil)
		return
	}
	defer file.Close()

	content, err := io.ReadAll(file)
	if err != nil {
		writeError(w, http.StatusBadRequest, "BAD_REQUEST", "failed to read upload file", map[string]any{
			"details": err.Error(),
		})
		return
	}
	if len(content) == 0 {
		writeError(w, http.StatusBadRequest, "VALIDATION_ERROR", "uploaded file is empty", nil)
		return
	}

	var metadata any
	metadataJSON := strings.TrimSpace(r.FormValue("metadata_json"))
	if metadataJSON != "" {
		if err := json.Unmarshal([]byte(metadataJSON), &metadata); err != nil {
			writeError(w, http.StatusBadRequest, "VALIDATION_ERROR", "metadata_json must be valid JSON", map[string]any{
				"details": err.Error(),
			})
			return
		}
	}

	filename := strings.TrimSpace(r.FormValue("filename"))
	if filename == "" {
		filename = strings.TrimSpace(header.Filename)
	}
	contentType := strings.TrimSpace(r.FormValue("content_type"))
	if contentType == "" {
		contentType = strings.TrimSpace(header.Header.Get("Content-Type"))
	}
	if contentType == "" || contentType == "application/octet-stream" {
		contentType = http.DetectContentType(content)
	}
	if filename == "" {
		filename = "artifact" + extensionFromContentType(contentType)
	}
	filename = sanitizeFilename(filename)
	visibility := strings.TrimSpace(r.FormValue("visibility"))

	input := map[string]any{
		"filename":     filename,
		"content_type": contentType,
		"size_bytes":   len(content),
		"role":         strings.TrimSpace(r.FormValue("role")),
	}
	projectID := strings.TrimSpace(r.FormValue("project_id"))
	if projectID != "" {
		input["project_id"] = projectID
	}
	if metadata != nil {
		input["metadata"] = metadata
	}

	record, _, err := s.store.createJob(
		"popiskill-artifact-upload-local-v1",
		"artifact.upload",
		"",
		"local_upload",
		input,
		projectID,
		"normal",
		"",
		current,
	)
	if err != nil {
		writeInternalError(w, "failed to create upload job", err)
		return
	}

	refMedia, err := persistMediaContent(
		s.cfg,
		current.User.ID,
		projectID,
		buildArtifactID(record.JobID, 0),
		filename,
		contentType,
		visibility,
		content,
		"",
	)
	if err != nil {
		writeInternalError(w, "failed to persist upload media", err)
		return
	}

	ref := resultRef{
		Kind:          "local_path",
		URL:           refMedia.URL,
		LocalPath:     refMedia.LocalPath,
		MediaID:       refMedia.ID,
		Filename:      refMedia.Filename,
		ContentType:   refMedia.ContentType,
		SizeBytes:     refMedia.SizeBytes,
		Visibility:    refMedia.Visibility,
		SHA256:        refMedia.SHA256,
		StorageStatus: "ready",
	}
	if err := s.store.completeJobWithResults(record.JobID, []resultRef{ref}, nil); err != nil {
		writeInternalError(w, "failed to persist upload artifact", err)
		return
	}

	item, _, exists, err := s.store.artifactRef(current.User.ID, buildArtifactID(record.JobID, 0))
	if err != nil {
		writeInternalError(w, "failed to load uploaded artifact", err)
		return
	}
	if !exists || item == nil {
		writeInternalError(w, "uploaded artifact missing after persistence", errors.New("artifact not found"))
		return
	}
	writeData(w, http.StatusCreated, item)
}

func (s *Server) handleMediaUpload(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodPost {
		methodNotAllowed(w)
		return
	}
	current, ok := s.authenticateSession(w, r)
	if !ok {
		return
	}

	if err := r.ParseMultipartForm(32 << 20); err != nil {
		writeError(w, http.StatusBadRequest, "VALIDATION_ERROR", "failed to parse multipart form", map[string]any{
			"details": err.Error(),
		})
		return
	}

	file, header, err := r.FormFile("file")
	if err != nil {
		writeError(w, http.StatusBadRequest, "VALIDATION_ERROR", "file is required", nil)
		return
	}
	defer file.Close()

	content, err := io.ReadAll(file)
	if err != nil {
		writeError(w, http.StatusBadRequest, "BAD_REQUEST", "failed to read upload file", map[string]any{
			"details": err.Error(),
		})
		return
	}
	if len(content) == 0 {
		writeError(w, http.StatusBadRequest, "VALIDATION_ERROR", "uploaded file is empty", nil)
		return
	}

	metadataJSON := strings.TrimSpace(r.FormValue("metadata_json"))
	if metadataJSON != "" {
		var metadata any
		if err := json.Unmarshal([]byte(metadataJSON), &metadata); err != nil {
			writeError(w, http.StatusBadRequest, "VALIDATION_ERROR", "metadata_json must be valid JSON", map[string]any{
				"details": err.Error(),
			})
			return
		}
	}

	filename := strings.TrimSpace(r.FormValue("filename"))
	if filename == "" {
		filename = strings.TrimSpace(header.Filename)
	}
	contentType := strings.TrimSpace(r.FormValue("content_type"))
	if contentType == "" {
		contentType = strings.TrimSpace(header.Header.Get("Content-Type"))
	}
	if contentType == "" || contentType == "application/octet-stream" {
		contentType = http.DetectContentType(content)
	}
	if filename == "" {
		filename = "media" + extensionFromContentType(contentType)
	}
	filename = sanitizeFilename(filename)

	record, err := persistMediaContent(
		s.cfg,
		current.User.ID,
		strings.TrimSpace(r.FormValue("project_id")),
		"",
		filename,
		contentType,
		strings.TrimSpace(r.FormValue("visibility")),
		content,
		"",
	)
	if err != nil {
		writeInternalError(w, "failed to persist media", err)
		return
	}
	writeData(w, http.StatusCreated, record.media)
}

func (s *Server) handleMedia(w http.ResponseWriter, r *http.Request) {
	path := strings.TrimPrefix(r.URL.Path, "/v1/media/")
	parts := strings.Split(strings.Trim(path, "/"), "/")
	if len(parts) == 0 || parts[0] == "" {
		notFound(w)
		return
	}

	record, exists, err := loadMediaRecord(s.cfg, parts[0])
	if err != nil {
		writeInternalError(w, "failed to load media", err)
		return
	}
	if !exists || record == nil {
		notFound(w)
		return
	}

	if len(parts) == 2 && parts[1] == "content" && r.Method == http.MethodGet {
		file, err := os.Open(record.LocalPath)
		if err != nil {
			writeInternalError(w, "failed to read media content", err)
			return
		}
		defer file.Close()

		w.Header().Set("Content-Type", defaultString(record.ContentType, "application/octet-stream"))
		if record.SizeBytes > 0 {
			w.Header().Set("Content-Length", strconv.FormatInt(record.SizeBytes, 10))
		}
		w.WriteHeader(http.StatusOK)
		if _, err := io.Copy(w, file); err != nil {
			log.Printf("popiartServer: streaming media %s failed: %v", record.ID, err)
		}
		return
	}

	current, ok := s.authenticateSession(w, r)
	if !ok {
		return
	}
	if current.User.ID != record.UserID {
		notFound(w)
		return
	}
	if len(parts) == 1 && r.Method == http.MethodGet {
		writeData(w, http.StatusOK, record.media)
		return
	}

	notFound(w)
}

func (s *Server) handleArtifact(w http.ResponseWriter, r *http.Request) {
	current, ok := s.authenticateSession(w, r)
	if !ok {
		return
	}

	path := strings.TrimPrefix(r.URL.Path, "/v1/artifacts/")
	parts := strings.Split(strings.Trim(path, "/"), "/")
	if len(parts) == 0 || parts[0] == "" {
		notFound(w)
		return
	}
	artifactID := parts[0]
	item, ref, exists, err := s.store.artifactRef(current.User.ID, artifactID)
	if err != nil {
		writeInternalError(w, "failed to load artifact", err)
		return
	}
	if !exists {
		notFound(w)
		return
	}

	if len(parts) == 1 && r.Method == http.MethodGet {
		writeData(w, http.StatusOK, item)
		return
	}

	if len(parts) == 2 && parts[1] == "content" && r.Method == http.MethodGet {
		ctx, cancel := context.WithTimeout(r.Context(), 3*time.Minute)
		defer cancel()
		contentType, sizeBytes, reader, err := s.newapi.openResultRef(ctx, current.UpstreamKey, ref)
		if err != nil {
			writeInternalError(w, "failed to read artifact content", err)
			return
		}
		defer reader.Close()
		w.Header().Set("Content-Type", defaultString(contentType, item.ContentType))
		if sizeBytes > 0 {
			w.Header().Set("Content-Length", strconv.FormatInt(sizeBytes, 10))
		}
		w.WriteHeader(http.StatusOK)
		if _, err := io.Copy(w, reader); err != nil {
			log.Printf("popiartServer: streaming artifact %s failed: %v", artifactID, err)
		}
		return
	}

	notFound(w)
}

func (s *Server) handleBudget(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		methodNotAllowed(w)
		return
	}
	_, ok := s.authenticateSession(w, r)
	if !ok {
		return
	}
	writeData(w, http.StatusOK, map[string]any{
		"period": map[string]any{
			"start": time.Now().UTC().AddDate(0, 0, -30).Format(time.RFC3339),
			"end":   time.Now().UTC().Format(time.RFC3339),
		},
		"used": map[string]any{
			"tokens":   12000,
			"cost_usd": 4.62,
		},
		"limit": map[string]any{
			"monthly_tokens":   1000000,
			"monthly_cost_usd": 200,
		},
		"remaining": map[string]any{
			"tokens":   988000,
			"cost_usd": 195.38,
		},
	})
}

func (s *Server) handleBudgetUsage(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		methodNotAllowed(w)
		return
	}
	_, ok := s.authenticateSession(w, r)
	if !ok {
		return
	}
	writeData(w, http.StatusOK, map[string]any{
		"rows": []map[string]any{
			{"dimension": "popiskill-image-text2image-basic-v1", "tokens_used": 3000, "cost_usd": 1.2, "job_count": 3},
			{"dimension": "popiskill-video-image2video-basic-v1", "tokens_used": 9000, "cost_usd": 3.42, "job_count": 2},
		},
		"total": map[string]any{"tokens_used": 12000, "cost_usd": 4.62, "job_count": 5},
	})
}

func (s *Server) handleBudgetLimits(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		methodNotAllowed(w)
		return
	}
	_, ok := s.authenticateSession(w, r)
	if !ok {
		return
	}
	writeData(w, http.StatusOK, map[string]any{
		"rate_limits": []map[string]any{
			{"window": "1m", "limit": 60, "remaining": 59, "reset_at": time.Now().UTC().Add(time.Minute).Format(time.RFC3339)},
		},
		"quota": map[string]any{"monthly_tokens": 1000000, "monthly_cost_usd": 200},
	})
}

func (s *Server) handleProjects(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		methodNotAllowed(w)
		return
	}
	_, ok := s.authenticateSession(w, r)
	if !ok {
		return
	}
	writeData(w, http.StatusOK, map[string]any{
		"items":  s.store.projects,
		"total":  len(s.store.projects),
		"limit":  intQuery(r, "limit", 20),
		"offset": 0,
	})
}

func (s *Server) handleProject(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		methodNotAllowed(w)
		return
	}
	_, ok := s.authenticateSession(w, r)
	if !ok {
		return
	}

	path := strings.TrimPrefix(r.URL.Path, "/v1/projects/")
	parts := strings.Split(strings.Trim(path, "/"), "/")
	if len(parts) == 0 || parts[0] == "" {
		notFound(w)
		return
	}
	projectID := parts[0]

	var found *project
	for _, item := range s.store.projects {
		if item.ID == projectID {
			copyItem := item
			found = &copyItem
			break
		}
	}
	if found == nil {
		notFound(w)
		return
	}

	if len(parts) == 1 {
		writeData(w, http.StatusOK, found)
		return
	}

	if len(parts) == 2 && parts[1] == "context" {
		routes, err := s.store.routesForProject(projectID)
		if err != nil {
			writeInternalError(w, "failed to load project routes", err)
			return
		}
		writeData(w, http.StatusOK, map[string]any{
			"project": found,
			"budget": map[string]any{
				"used":      map[string]any{"tokens": 12000, "cost_usd": 4.62},
				"limit":     map[string]any{"monthly_tokens": 1000000, "monthly_cost_usd": 200},
				"remaining": map[string]any{"tokens": 988000, "cost_usd": 195.38},
			},
			"route_overrides":  routes,
			"available_skills": s.store.skills,
		})
		return
	}

	notFound(w)
}

func (s *Server) handleModels(w http.ResponseWriter, r *http.Request) {
	if r.URL.Path != "/v1/models" {
		notFound(w)
		return
	}
	current, ok := s.authenticateSession(w, r)
	if !ok {
		return
	}
	if r.Method != http.MethodGet {
		methodNotAllowed(w)
		return
	}
	if s.newapi == nil || !s.newapi.enabled() {
		writeError(w, http.StatusServiceUnavailable, "MODEL_LIST_UNAVAILABLE", "PopiNewAPI is not configured for popiartServer", nil)
		return
	}

	ctx, cancel := context.WithTimeout(r.Context(), 30*time.Second)
	defer cancel()
	items, err := s.newapi.listModels(ctx, current.UpstreamKey)
	if err != nil {
		writeError(w, http.StatusBadGateway, "MODEL_LIST_FAILED", "failed to load models from PopiNewAPI", map[string]any{
			"details": err.Error(),
		})
		return
	}

	modelType := r.URL.Query().Get("type")
	provider := r.URL.Query().Get("provider")
	filtered := make([]model, 0, len(items))
	for _, item := range items {
		if modelType != "" && item.Type != modelType {
			continue
		}
		if provider != "" && item.Provider != provider {
			continue
		}
		filtered = append(filtered, item)
	}
	writeData(w, http.StatusOK, map[string]any{"items": filtered})
}

func (s *Server) handleModelRoutes(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		methodNotAllowed(w)
		return
	}
	_, ok := s.authenticateSession(w, r)
	if !ok {
		return
	}
	projectID := r.URL.Query().Get("project_id")
	routes, err := s.store.routesForProject(projectID)
	if err != nil {
		writeInternalError(w, "failed to load route overrides", err)
		return
	}
	writeData(w, http.StatusOK, map[string]any{
		"global": map[string]any{
			"image": s.cfg.DefaultImageModel,
			"video": s.cfg.DefaultVideoModel,
			"audio": "",
		},
		"overrides": map[string]any{
			projectID: routes,
		},
	})
}

func (s *Server) handleModelRouteOverrides(w http.ResponseWriter, r *http.Request) {
	_, ok := s.authenticateSession(w, r)
	if !ok {
		return
	}

	switch r.Method {
	case http.MethodGet:
		projectID := r.URL.Query().Get("project_id")
		routes, err := s.store.routesForProject(projectID)
		if err != nil {
			writeInternalError(w, "failed to load route overrides", err)
			return
		}
		writeData(w, http.StatusOK, map[string]any{
			"project_id": projectID,
			"items":      routes,
		})
	case http.MethodPost:
		var req struct {
			ProjectID string `json:"project_id"`
			SkillType string `json:"skill_type"`
			ModelID   string `json:"model_id"`
		}
		if !decodeJSON(w, r, &req) {
			return
		}
		if req.ProjectID == "" || req.SkillType == "" || req.ModelID == "" {
			writeError(w, http.StatusBadRequest, "VALIDATION_ERROR", "project_id, skill_type, and model_id are required", nil)
			return
		}
		routeKey := normalizeRouteKey(req.SkillType)
		if err := s.store.setRouteOverride(req.ProjectID, routeKey, req.ModelID); err != nil {
			writeInternalError(w, "failed to save route override", err)
			return
		}
		writeData(w, http.StatusOK, map[string]any{
			"project_id": req.ProjectID,
			"skill_type": req.SkillType,
			"route_key":  routeKey,
			"model_id":   req.ModelID,
		})
	default:
		methodNotAllowed(w)
	}
}

func (s *Server) handleModelRouteOverrideUnset(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodPost {
		methodNotAllowed(w)
		return
	}
	_, ok := s.authenticateSession(w, r)
	if !ok {
		return
	}
	var req struct {
		ProjectID string `json:"project_id"`
		SkillType string `json:"skill_type"`
	}
	if !decodeJSON(w, r, &req) {
		return
	}
	if req.ProjectID == "" || req.SkillType == "" {
		writeError(w, http.StatusBadRequest, "VALIDATION_ERROR", "project_id and skill_type are required", nil)
		return
	}
	routeKey := normalizeRouteKey(req.SkillType)
	if err := s.store.unsetRouteOverride(req.ProjectID, routeKey); err != nil {
		writeInternalError(w, "failed to delete route override", err)
		return
	}
	writeData(w, http.StatusOK, map[string]any{
		"project_id": req.ProjectID,
		"skill_type": req.SkillType,
		"route_key":  routeKey,
		"unset":      true,
	})
}

func (s *Server) handleModelsInfer(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodPost {
		methodNotAllowed(w)
		return
	}
	current, ok := s.authenticateSession(w, r)
	if !ok {
		return
	}
	var req struct {
		ModelID        string         `json:"model_id"`
		Input          map[string]any `json:"input"`
		ProjectID      string         `json:"project_id"`
		Priority       string         `json:"priority"`
		IdempotencyKey string         `json:"idempotency_key"`
	}
	if !decodeJSON(w, r, &req) {
		return
	}
	if req.ModelID == "" {
		writeError(w, http.StatusBadRequest, "VALIDATION_ERROR", "model_id is required", nil)
		return
	}
	routeKey := inferRouteKeyForModel(req.ModelID)
	record, statusCode, err := s.store.createJob(
		"",
		routeKey,
		req.ModelID,
		routeExecMode(routeKey),
		req.Input,
		req.ProjectID,
		defaultString(req.Priority, "normal"),
		req.IdempotencyKey,
		current,
	)
	if err != nil {
		writeInternalError(w, "failed to create model job", err)
		return
	}
	if statusCode == http.StatusAccepted {
		go s.dispatchJob(record)
	}
	writeData(w, statusCode, map[string]any{
		"job_id":     record.JobID,
		"status":     record.Status,
		"created_at": record.CreatedAt,
	})
}

func (s *Server) dispatchJob(record *job) {
	if record == nil {
		return
	}

	switch normalizeRouteKey(record.RouteKey) {
	case "image.text2image":
		s.executeTextToImageJob(record)
	case "image.img2img":
		s.executeImageToImageJob(record)
	case "video.image2video":
		s.executeImageToVideoJob(record)
	default:
		s.executeUnsupportedSkill(record)
	}
}

func (s *Server) executeTextToImageJob(record *job) {
	if _, _, err := s.store.startJob(record.JobID); err != nil {
		log.Printf("popiartServer: start job %s failed: %v", record.JobID, err)
	}

	if s.newapi == nil || !s.newapi.enabled() {
		if err := s.store.failJob(record.JobID, "NEWAPI_NOT_CONFIGURED", "PopiNewAPI is not configured for popiartServer", nil); err != nil {
			log.Printf("popiartServer: fail job %s failed: %v", record.JobID, err)
		}
		return
	}

	modelID := strings.TrimSpace(record.ModelID)
	if modelID == "" {
		modelID = s.resolveModelID(record.RouteKey, record.ProjectID)
	}
	ctx, cancel := context.WithTimeout(context.Background(), 3*time.Minute)
	defer cancel()

	refs, usage, err := s.newapi.generateImageRefs(ctx, record.UpstreamKey, modelID, record.Input)
	if err != nil {
		if repoErr := s.store.failJob(record.JobID, "MODEL_REQUEST_FAILED", err.Error(), map[string]any{
			"model_id": modelID,
		}); repoErr != nil {
			log.Printf("popiartServer: fail job %s failed: %v", record.JobID, repoErr)
		}
		return
	}

	refs, err = s.persistResultRefs(ctx, record, refs)
	if err != nil {
		if repoErr := s.store.failJob(record.JobID, "MEDIA_PERSIST_FAILED", "failed to persist generated media", map[string]any{
			"details":  err.Error(),
			"model_id": modelID,
		}); repoErr != nil {
			log.Printf("popiartServer: fail job %s failed: %v", record.JobID, repoErr)
		}
		return
	}

	if err := s.store.completeJobWithResults(record.JobID, refs, usage); err != nil {
		log.Printf("popiartServer: complete job %s failed: %v", record.JobID, err)
		if failErr := s.store.failJob(record.JobID, "RESULT_REF_PERSIST_FAILED", "failed to persist job result refs", map[string]any{
			"details": err.Error(),
		}); failErr != nil {
			log.Printf("popiartServer: fail job %s after result ref error failed: %v", record.JobID, failErr)
		}
	}
}

func (s *Server) executeImageToImageJob(record *job) {
	if _, _, err := s.store.startJob(record.JobID); err != nil {
		log.Printf("popiartServer: start job %s failed: %v", record.JobID, err)
	}

	if s.newapi == nil || !s.newapi.enabled() {
		if err := s.store.failJob(record.JobID, "NEWAPI_NOT_CONFIGURED", "PopiNewAPI is not configured for popiartServer", nil); err != nil {
			log.Printf("popiartServer: fail job %s failed: %v", record.JobID, err)
		}
		return
	}

	modelID := strings.TrimSpace(record.ModelID)
	if modelID == "" {
		modelID = s.resolveModelID(record.RouteKey, record.ProjectID)
	}
	ctx, cancel := context.WithTimeout(context.Background(), 3*time.Minute)
	defer cancel()

	input := buildImageToImageInput(record)
	ref, err := s.resolveImageToImageReference(ctx, record, input)
	if err != nil {
		if repoErr := s.store.failJob(record.JobID, "REFERENCE_IMAGE_RESOLUTION_FAILED", err.Error(), map[string]any{
			"skill_id":  record.SkillID,
			"route_key": record.RouteKey,
		}); repoErr != nil {
			log.Printf("popiartServer: fail job %s failed: %v", record.JobID, repoErr)
		}
		return
	}

	refs, usage, err := s.newapi.generateEditedImageRefs(ctx, record.UpstreamKey, modelID, input, ref)
	if err != nil {
		if repoErr := s.store.failJob(record.JobID, "MODEL_REQUEST_FAILED", err.Error(), map[string]any{
			"model_id":  modelID,
			"route_key": record.RouteKey,
		}); repoErr != nil {
			log.Printf("popiartServer: fail job %s failed: %v", record.JobID, repoErr)
		}
		return
	}

	refs, err = s.persistResultRefs(ctx, record, refs)
	if err != nil {
		if repoErr := s.store.failJob(record.JobID, "MEDIA_PERSIST_FAILED", "failed to persist generated media", map[string]any{
			"details":   err.Error(),
			"model_id":  modelID,
			"route_key": record.RouteKey,
		}); repoErr != nil {
			log.Printf("popiartServer: fail job %s failed: %v", record.JobID, repoErr)
		}
		return
	}

	if err := s.store.completeJobWithResults(record.JobID, refs, usage); err != nil {
		log.Printf("popiartServer: complete job %s failed: %v", record.JobID, err)
		if failErr := s.store.failJob(record.JobID, "RESULT_REF_PERSIST_FAILED", "failed to persist job result refs", map[string]any{
			"details": err.Error(),
		}); failErr != nil {
			log.Printf("popiartServer: fail job %s after result ref error failed: %v", record.JobID, failErr)
		}
	}
}

func (s *Server) executeImageToVideoJob(record *job) {
	if _, _, err := s.store.startJob(record.JobID); err != nil {
		log.Printf("popiartServer: start job %s failed: %v", record.JobID, err)
	}

	if s.newapi == nil || !s.newapi.enabled() {
		if err := s.store.failJob(record.JobID, "NEWAPI_NOT_CONFIGURED", "PopiNewAPI is not configured for popiartServer", nil); err != nil {
			log.Printf("popiartServer: fail job %s failed: %v", record.JobID, err)
		}
		return
	}

	modelID := strings.TrimSpace(record.ModelID)
	if modelID == "" {
		modelID = s.resolveModelID(record.RouteKey, record.ProjectID)
	}

	input := buildImageToVideoInput(record)
	submitCtx, cancelSubmit := context.WithTimeout(context.Background(), 2*time.Minute)
	defer cancelSubmit()

	ref, err := s.resolveImageToImageReference(submitCtx, record, input)
	if err != nil {
		if repoErr := s.store.failJob(record.JobID, "REFERENCE_IMAGE_RESOLUTION_FAILED", err.Error(), map[string]any{
			"skill_id":  record.SkillID,
			"route_key": record.RouteKey,
		}); repoErr != nil {
			log.Printf("popiartServer: fail job %s failed: %v", record.JobID, repoErr)
		}
		return
	}

	upstreamTaskID, err := s.newapi.submitImageToVideoTask(submitCtx, record.UpstreamKey, modelID, input, ref)
	if err != nil {
		if repoErr := s.store.failJob(record.JobID, "MODEL_REQUEST_FAILED", err.Error(), map[string]any{
			"model_id":  modelID,
			"route_key": record.RouteKey,
		}); repoErr != nil {
			log.Printf("popiartServer: fail job %s failed: %v", record.JobID, repoErr)
		}
		return
	}

	if err := s.store.linkUpstreamTask(record.JobID, upstreamTaskID); err != nil {
		if repoErr := s.store.failJob(record.JobID, "TASK_LINK_PERSIST_FAILED", "failed to persist upstream task id", map[string]any{
			"details":        err.Error(),
			"newapi_task_id": upstreamTaskID,
		}); repoErr != nil {
			log.Printf("popiartServer: fail job %s failed: %v", record.JobID, repoErr)
		}
		return
	}

	pollCtx, cancelPoll := context.WithTimeout(context.Background(), 20*time.Minute)
	defer cancelPoll()

	taskResult, err := s.waitForVideoTask(pollCtx, record.UpstreamKey, upstreamTaskID)
	if err != nil {
		if repoErr := s.store.failJob(record.JobID, "TASK_POLL_FAILED", err.Error(), map[string]any{
			"model_id":       modelID,
			"route_key":      record.RouteKey,
			"newapi_task_id": upstreamTaskID,
		}); repoErr != nil {
			log.Printf("popiartServer: fail job %s failed: %v", record.JobID, repoErr)
		}
		return
	}

	refs := []resultRef{buildVideoResultRef(s.newapi.baseURL, upstreamTaskID, modelID, taskResult)}
	usage := map[string]any{
		"newapi_task_id": upstreamTaskID,
		"status":         taskResult.Status,
	}
	if strings.TrimSpace(taskResult.Format) != "" {
		usage["format"] = taskResult.Format
	}

	persistCtx, cancelPersist := context.WithTimeout(context.Background(), 5*time.Minute)
	defer cancelPersist()
	refs, err = s.persistResultRefs(persistCtx, record, refs)
	if err != nil {
		if repoErr := s.store.failJob(record.JobID, "MEDIA_PERSIST_FAILED", "failed to persist generated media", map[string]any{
			"details":        err.Error(),
			"model_id":       modelID,
			"route_key":      record.RouteKey,
			"newapi_task_id": upstreamTaskID,
		}); repoErr != nil {
			log.Printf("popiartServer: fail job %s failed: %v", record.JobID, repoErr)
		}
		return
	}

	if err := s.store.completeJobWithResults(record.JobID, refs, usage); err != nil {
		log.Printf("popiartServer: complete job %s failed: %v", record.JobID, err)
		if failErr := s.store.failJob(record.JobID, "RESULT_REF_PERSIST_FAILED", "failed to persist job result refs", map[string]any{
			"details": err.Error(),
		}); failErr != nil {
			log.Printf("popiartServer: fail job %s after result ref error failed: %v", record.JobID, failErr)
		}
	}
}

func (s *Server) executeUnsupportedSkill(record *job) {
	if _, _, err := s.store.startJob(record.JobID); err != nil {
		log.Printf("popiartServer: start job %s failed: %v", record.JobID, err)
	}
	time.Sleep(300 * time.Millisecond)
	if err := s.store.failJob(record.JobID, "NOT_IMPLEMENTED", "skill runtime is not connected yet", map[string]any{
		"skill_id":  record.SkillID,
		"route_key": record.RouteKey,
		"exec_mode": record.ExecMode,
	}); err != nil {
		log.Printf("popiartServer: fail job %s failed: %v", record.JobID, err)
	}
}

func (s *Server) resolveModelID(routeKey, projectID string) string {
	routes, err := s.store.routesForProject(projectID)
	if err == nil {
		if override := routes[normalizeRouteKey(routeKey)]; override != "" {
			return override
		}
	}
	switch normalizeRouteKey(routeKey) {
	case "video.image2video":
		return s.cfg.DefaultVideoModel
	default:
		return s.cfg.DefaultImageModel
	}
}

func inferRouteKeyForModel(modelID string) string {
	if modelType, _ := classifyModelIDFallback(modelID); modelType == "video" {
		return "video.image2video"
	}
	return "image.text2image"
}

func (s *Server) resolveImageToImageReference(ctx context.Context, record *job, input map[string]any) (imageEditReference, error) {
	if record == nil {
		return imageEditReference{}, fmt.Errorf("job record is required")
	}
	if artifactID := strings.TrimSpace(stringValue(input["source_artifact_id"])); artifactID != "" {
		item, ref, exists, err := s.store.artifactRef(record.UserID, artifactID)
		if err != nil {
			return imageEditReference{}, err
		}
		if !exists {
			return imageEditReference{}, fmt.Errorf("source artifact not found: %s", artifactID)
		}
		contentType, _, reader, err := s.newapi.openResultRef(ctx, record.UpstreamKey, ref)
		if err != nil {
			return imageEditReference{}, err
		}
		defer reader.Close()
		content, err := io.ReadAll(reader)
		if err != nil {
			return imageEditReference{}, err
		}
		return imageEditReference{
			Filename:    item.Filename,
			ContentType: defaultString(contentType, item.ContentType),
			Content:     content,
			URL:         item.URL,
		}, nil
	}

	refURL := strings.TrimSpace(stringValue(
		input["reference_image_url"],
		input["image_url"],
	))
	if refURL == "" && strings.Contains(record.SkillID, "popistudio-alice-showcase") {
		refURL = defaultAliceReferenceURL
	}
	if refURL == "" {
		return imageEditReference{}, fmt.Errorf("reference image is required")
	}
	return s.downloadReferenceImage(ctx, refURL)
}

func (s *Server) waitForVideoTask(ctx context.Context, token, taskID string) (*videoTaskResult, error) {
	ticker := time.NewTicker(3 * time.Second)
	defer ticker.Stop()

	for {
		result, err := s.newapi.fetchVideoTask(ctx, token, taskID)
		if err != nil {
			return nil, err
		}
		switch result.Status {
		case "completed":
			return result, nil
		case "failed":
			message := defaultString(strings.TrimSpace(result.ErrorReason), "video task failed")
			return nil, errors.New(message)
		case "queued", "in_progress", "":
		default:
			if strings.TrimSpace(result.Status) != "" {
				return nil, fmt.Errorf("unexpected video task status: %s", result.Status)
			}
		}

		select {
		case <-ctx.Done():
			return nil, ctx.Err()
		case <-ticker.C:
		}
	}
}

func (s *Server) downloadReferenceImage(ctx context.Context, rawURL string) (imageEditReference, error) {
	req, err := http.NewRequestWithContext(ctx, http.MethodGet, rawURL, nil)
	if err != nil {
		return imageEditReference{}, err
	}
	resp, err := s.newapi.httpClient.Do(req)
	if err != nil {
		return imageEditReference{}, err
	}
	defer resp.Body.Close()
	if resp.StatusCode >= 400 {
		body, _ := io.ReadAll(resp.Body)
		return imageEditReference{}, fmt.Errorf("download reference image failed: %s", strings.TrimSpace(string(body)))
	}
	content, err := io.ReadAll(resp.Body)
	if err != nil {
		return imageEditReference{}, err
	}
	contentType := defaultString(strings.TrimSpace(resp.Header.Get("Content-Type")), http.DetectContentType(content))
	return imageEditReference{
		Filename:    filenameFromURL(rawURL, "reference"+extensionFromContentType(contentType)),
		ContentType: contentType,
		Content:     content,
		URL:         strings.TrimSpace(rawURL),
	}, nil
}

func buildImageToImageInput(record *job) map[string]any {
	input := cloneMap(record.Input)
	if input == nil {
		input = map[string]any{}
	}

	prompt := strings.TrimSpace(stringValue(
		input["prompt"],
		input["scene_prompt"],
	))

	if strings.Contains(record.SkillID, "popistudio-alice-showcase") {
		prompt = buildAliceShowcasePrompt(input, prompt)
	} else {
		prompt = buildGenericImageToImagePrompt(input, prompt)
	}

	input["prompt"] = prompt
	delete(input, "scene_prompt")
	return input
}

func buildImageToVideoInput(record *job) map[string]any {
	input := cloneMap(record.Input)
	if input == nil {
		input = map[string]any{}
	}

	prompt := strings.TrimSpace(stringValue(
		input["prompt"],
		input["motion_prompt"],
		input["scene_prompt"],
	))

	parts := make([]string, 0, 6)
	if prompt != "" {
		parts = append(parts, prompt)
	}
	if cameraMotion := strings.TrimSpace(stringValue(input["camera_motion"])); cameraMotion != "" {
		parts = append(parts, "camera motion "+cameraMotion)
	}
	if shotType := strings.TrimSpace(stringValue(input["shot_type"])); shotType != "" {
		parts = append(parts, shotType)
	}
	if mood := strings.TrimSpace(stringValue(input["mood"])); mood != "" {
		parts = append(parts, mood)
	}
	if aspectRatio := strings.TrimSpace(stringValue(input["aspect_ratio"])); aspectRatio != "" {
		parts = append(parts, "aspect ratio "+aspectRatio)
	}
	if len(parts) == 0 {
		parts = append(parts, "Generate a short polished cinematic motion clip that preserves the reference image subject identity.")
	}

	input["prompt"] = strings.Join(parts, ", ")
	delete(input, "motion_prompt")
	delete(input, "scene_prompt")
	return input
}

func buildAliceShowcasePrompt(input map[string]any, scenePrompt string) string {
	parts := []string{
		"PopiStudio Alice as the same fixed main protagonist from the canonical Alice reference image",
		"preserve the same anime facial structure, recognizability, hairstyle, hair color, clothing language, and main palette",
		"Alice remains the visual center of the frame",
	}

	if scenePrompt != "" {
		parts = append(parts, scenePrompt)
	}
	if shotType := strings.TrimSpace(stringValue(input["shot_type"])); shotType != "" {
		parts = append(parts, shotType)
	}
	if camera := strings.TrimSpace(stringValue(input["camera"])); camera != "" {
		parts = append(parts, camera)
	}
	if mood := strings.TrimSpace(stringValue(input["mood"])); mood != "" {
		parts = append(parts, mood)
	}
	if aspectRatio := strings.TrimSpace(stringValue(input["aspect_ratio"])); aspectRatio != "" {
		parts = append(parts, "aspect ratio "+aspectRatio)
	}

	parts = append(parts,
		"real-world modern Chinese living scene",
		"Sony photo realism",
		"natural light",
		"warm realistic tone",
		"high detail",
		"clean composition",
	)

	return strings.Join(parts, ", ")
}

func buildGenericImageToImagePrompt(input map[string]any, prompt string) string {
	parts := make([]string, 0, 6)
	if prompt != "" {
		parts = append(parts, prompt)
	}
	if refURL := strings.TrimSpace(stringValue(input["reference_image_url"], input["image_url"])); refURL != "" {
		parts = append(parts, "preserve the same main subject identity and key visual traits from the reference image")
	}
	if aspectRatio := strings.TrimSpace(stringValue(input["aspect_ratio"])); aspectRatio != "" {
		parts = append(parts, "aspect ratio "+aspectRatio)
	}
	if len(parts) == 0 {
		return "preserve the same main subject identity and render a polished high-detail image"
	}
	return strings.Join(parts, ", ")
}

func stringValue(values ...any) string {
	for _, value := range values {
		if text, ok := value.(string); ok && strings.TrimSpace(text) != "" {
			return text
		}
	}
	return ""
}

func buildVideoResultRef(baseURL, taskID, modelID string, task *videoTaskResult) resultRef {
	urlValue := strings.TrimSpace(task.URL)
	if urlValue == "" {
		urlValue = strings.TrimRight(baseURL, "/") + "/v1/videos/" + taskID + "/content"
	}

	contentType := "video/mp4"
	ext := ".mp4"
	if format := strings.TrimSpace(task.Format); format != "" {
		switch strings.ToLower(strings.TrimPrefix(format, ".")) {
		case "mov", "quicktime":
			contentType = "video/quicktime"
			ext = ".mov"
		case "webm":
			contentType = "video/webm"
			ext = ".webm"
		case "mp4":
			contentType = "video/mp4"
			ext = ".mp4"
		}
	}
	filename := filenameFromURL(urlValue, "")
	if filename == "" || filename == "content" || !strings.Contains(filepath.Base(filename), ".") {
		filename = sanitizeFilename(defaultString(modelID, "video")) + "-" + sanitizeFilename(taskID) + ext
	}

	if strings.HasPrefix(urlValue, "data:") {
		return resultRef{
			Kind:        "data_url",
			DataURL:     urlValue,
			Filename:    filename,
			ContentType: contentType,
		}
	}
	return resultRef{
		Kind:        "url",
		URL:         urlValue,
		Filename:    filename,
		ContentType: contentType,
	}
}

const defaultAliceReferenceURL = "http://8.136.121.101:8790/media/Character_id_card/alice.jpg"

func (s *Server) authenticateSession(w http.ResponseWriter, r *http.Request) (session, bool) {
	token, ok := bearerToken(r)
	if !ok {
		writeError(w, http.StatusUnauthorized, "UNAUTHENTICATED", "missing bearer key", nil)
		return session{}, false
	}
	current, exists, err := s.store.session(token)
	if err != nil {
		writeInternalError(w, "failed to load session", err)
		return session{}, false
	}
	if !exists {
		writeError(w, http.StatusUnauthorized, "UNAUTHENTICATED", "key invalid or expired", nil)
		return session{}, false
	}
	return current, true
}

func bearerToken(r *http.Request) (string, bool) {
	header := strings.TrimSpace(r.Header.Get("Authorization"))
	if header == "" || !strings.HasPrefix(header, "Bearer ") {
		return "", false
	}
	return strings.TrimSpace(strings.TrimPrefix(header, "Bearer ")), true
}

func decodeJSON(w http.ResponseWriter, r *http.Request, dst any) bool {
	defer r.Body.Close()
	body, err := io.ReadAll(r.Body)
	if err != nil {
		writeError(w, http.StatusBadRequest, "BAD_REQUEST", "failed to read request body", nil)
		return false
	}
	if len(strings.TrimSpace(string(body))) == 0 {
		body = []byte(`{}`)
	}
	if err := json.Unmarshal(body, dst); err != nil {
		writeError(w, http.StatusBadRequest, "VALIDATION_ERROR", "invalid JSON body", map[string]any{
			"details": err.Error(),
		})
		return false
	}
	return true
}

func intQuery(r *http.Request, key string, fallback int) int {
	value := r.URL.Query().Get(key)
	if value == "" {
		return fallback
	}
	n, err := strconv.Atoi(value)
	if err != nil || n < 0 {
		return fallback
	}
	return n
}

func writeData(w http.ResponseWriter, status int, data any) {
	writeJSON(w, status, map[string]any{
		"ok":   true,
		"data": data,
	})
}

func buildDataURL(contentType string, content []byte) string {
	return "data:" + defaultString(strings.TrimSpace(contentType), "application/octet-stream") + ";base64," + base64.StdEncoding.EncodeToString(content)
}

func writeError(w http.ResponseWriter, status int, code, message string, details map[string]any) {
	errBody := map[string]any{
		"code":    code,
		"message": message,
	}
	for key, value := range details {
		errBody[key] = value
	}
	writeJSON(w, status, map[string]any{
		"ok":    false,
		"error": errBody,
	})
}

func writeInternalError(w http.ResponseWriter, message string, err error) {
	details := map[string]any{}
	if err != nil {
		details["details"] = err.Error()
	}
	writeError(w, http.StatusInternalServerError, "SERVER_ERROR", message, details)
}

func writeJSON(w http.ResponseWriter, status int, payload any) {
	w.Header().Set("Content-Type", "application/json; charset=utf-8")
	w.WriteHeader(status)
	_ = json.NewEncoder(w).Encode(payload)
}

func notFound(w http.ResponseWriter) {
	writeError(w, http.StatusNotFound, "NOT_FOUND", "resource not found", nil)
}

func methodNotAllowed(w http.ResponseWriter) {
	writeError(w, http.StatusMethodNotAllowed, "BAD_REQUEST", "method not allowed", nil)
}

func mustJSON(value any) string {
	data, err := json.Marshal(value)
	if err != nil {
		return `{"level":"error","message":"marshal failed"}`
	}
	return string(data)
}

func defaultString(value, fallback string) string {
	if value != "" {
		return value
	}
	return fallback
}