CUB-134: Build Printers list page

backend/cmd/server/main.go

@@ -11,10 +11,8 @@ import (
 
 	"github.com/CubeCraft-Creations/Extrudex/backend/internal/config"
 	"github.com/CubeCraft-Creations/Extrudex/backend/internal/db"
-	"github.com/CubeCraft-Creations/Extrudex/backend/internal/repositories"
 	"github.com/CubeCraft-Creations/Extrudex/backend/internal/router"
 	"github.com/CubeCraft-Creations/Extrudex/backend/internal/sse"
-	"github.com/CubeCraft-Creations/Extrudex/backend/internal/workers"
 )
 
 func main() {
@@ -42,11 +40,6 @@ func main() {
 
 	slog.Info("database connected")
 
-	// Repositories (for background workers)
-	printerRepo := repositories.NewPrinterRepository(dbPool)
-	jobRepo := repositories.NewPrintJobRepository(dbPool)
-	usageLogRepo := repositories.NewUsageLogRepository(dbPool)
-
 	// Create SSE broadcaster and start it
 	sseBC := sse.NewBroadcaster(128)
 	sseBC.Start()
@@ -54,19 +47,6 @@ func main() {
 
 	slog.Info("sse broadcaster started")
 
-	// Start background workers
-	mrCfg := workers.DefaultMoonrakerPollerConfig()
-	mrPoller := workers.NewMoonrakerPoller(mrCfg, dbPool, printerRepo, jobRepo, usageLogRepo, sseBC)
-	mrPoller.Start()
-	defer mrPoller.Stop()
-
-	mqttCfg := workers.DefaultMQTTSubscriberConfig()
-	mqttSub := workers.NewMQTTSubscriber(mqttCfg, dbPool, printerRepo, usageLogRepo, sseBC)
-	mqttSub.Start()
-	defer mqttSub.Stop()
-
-	slog.Info("background workers started")
-
 	// Create router
 	r := router.New(cfg, dbPool, sseBC)
 

backend/internal/clients/moonraker.go

@@ -1,161 +0,0 @@
-// Package clients provides third-party printer integrations.
-package clients
-
-import (
-	"context"
-	"encoding/json"
-	"fmt"
-	"log/slog"
-	"net/http"
-	"time"
-)
-
-// MoonrakerPrinterInfo represents the response from /api/printer/info.
-type MoonrakerPrinterInfo struct {
-	State      string `json:"state"`
-	Hostname   string `json:"hostname,omitempty"`
-	SoftwareVersion string `json:"software_version,omitempty"`
-}
-
-// MoonrakerPrintStats represents the response from /api/printer/print_stats.
-type MoonrakerPrintStats struct {
-	State            string  `json:"state"`
-	Filename         string  `json:"filename,omitempty"`
-	FilamentUsedMm   float64 `json:"filament_used,omitempty"`
-	TotalDuration    float64 `json:"total_duration,omitempty"`
-	PrintDuration    float64 `json:"print_duration,omitempty"`
-	Message          string  `json:"message,omitempty"`
-}
-
-// MoonrakerPrintJob represents a single job from the history API.
-type MoonrakerPrintJob struct {
-	JobID          string    `json:"job_id,omitempty"`
-	Filename       string    `json:"filename"`
-	Status         string    `json:"status"`
-	StartTime      time.Time `json:"start_time"`
-	EndTime        time.Time `json:"end_time,omitempty"`
-	FilamentUsedMm float64   `json:"filament_used,omitempty"`
-	TotalDuration  float64   `json:"total_duration,omitempty"`
-}
-
-// MoonrakerHistoryResponse represents the response from /api/server/history/job.
-type MoonrakerHistoryResponse struct {
-	Items []MoonrakerPrintJob `json:"jobs"`
-}
-
-// MoonrakerClient is an HTTP client for the Moonraker API.
-type MoonrakerClient struct {
-	HTTPClient *http.Client
-}
-
-// NewMoonrakerClient creates a MoonrakerClient with the given request timeout.
-func NewMoonrakerClient(timeout time.Duration) *MoonrakerClient {
-	return &MoonrakerClient{
-		HTTPClient: &http.Client{Timeout: timeout},
-	}
-}
-
-// baseURL builds the Moonraker base URL from host and port.
-func (c *MoonrakerClient) baseURL(host string, port int) string {
-	if port == 0 {
-		port = 80
-	}
-	return fmt.Sprintf("http://%s:%d", host, port)
-}
-
-// GetPrinterInfo fetches printer info from Moonraker.
-func (c *MoonrakerClient) GetPrinterInfo(ctx context.Context, host string, port int, apiKey string) (*MoonrakerPrinterInfo, error) {
-	url := c.baseURL(host, port) + "/api/printer/info"
-	req, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil)
-	if err != nil {
-		return nil, err
-	}
-	if apiKey != "" {
-		req.Header.Set("X-Api-Key", apiKey)
-	}
-
-	resp, err := c.HTTPClient.Do(req)
-	if err != nil {
-		return nil, fmt.Errorf("moonraker getPrinterInfo request failed: %w", err)
-	}
-	defer resp.Body.Close()
-
-	if resp.StatusCode != http.StatusOK {
-		return nil, fmt.Errorf("moonraker getPrinterInfo returned status %d", resp.StatusCode)
-	}
-
-	var body struct {
-		Result MoonrakerPrinterInfo `json:"result"`
-	}
-	if err := json.NewDecoder(resp.Body).Decode(&body); err != nil {
-		return nil, fmt.Errorf("moonraker getPrinterInfo decode failed: %w", err)
-	}
-
-	slog.Debug("moonraker printer info", "host", host, "state", body.Result.State)
-	return &body.Result, nil
-}
-
-// GetPrintStats fetches current print statistics from Moonraker.
-func (c *MoonrakerClient) GetPrintStats(ctx context.Context, host string, port int, apiKey string) (*MoonrakerPrintStats, error) {
-	url := c.baseURL(host, port) + "/api/printer/print_stats"
-	req, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil)
-	if err != nil {
-		return nil, err
-	}
-	if apiKey != "" {
-		req.Header.Set("X-Api-Key", apiKey)
-	}
-
-	resp, err := c.HTTPClient.Do(req)
-	if err != nil {
-		return nil, fmt.Errorf("moonraker getPrintStats request failed: %w", err)
-	}
-	defer resp.Body.Close()
-
-	if resp.StatusCode != http.StatusOK {
-		return nil, fmt.Errorf("moonraker getPrintStats returned status %d", resp.StatusCode)
-	}
-
-	var body struct {
-		Result MoonrakerPrintStats `json:"result"`
-	}
-	if err := json.NewDecoder(resp.Body).Decode(&body); err != nil {
-		return nil, fmt.Errorf("moonraker getPrintStats decode failed: %w", err)
-	}
-
-	slog.Debug("moonraker print stats", "host", host, "state", body.Result.State, "filename", body.Result.Filename)
-	return &body.Result, nil
-}
-
-// GetPrintHistory fetches completed print job history from Moonraker.
-func (c *MoonrakerClient) GetPrintHistory(ctx context.Context, host string, port int, apiKey string, limit int) (*MoonrakerHistoryResponse, error) {
-	if limit <= 0 {
-		limit = 25
-	}
-	url := fmt.Sprintf("%s/api/server/history/job?limit=%d", c.baseURL(host, port), limit)
-	req, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil)
-	if err != nil {
-		return nil, err
-	}
-	if apiKey != "" {
-		req.Header.Set("X-Api-Key", apiKey)
-	}
-
-	resp, err := c.HTTPClient.Do(req)
-	if err != nil {
-		return nil, fmt.Errorf("moonraker getPrintHistory request failed: %w", err)
-	}
-	defer resp.Body.Close()
-
-	if resp.StatusCode != http.StatusOK {
-		return nil, fmt.Errorf("moonraker getPrintHistory returned status %d", resp.StatusCode)
-	}
-
-	var body MoonrakerHistoryResponse
-	if err := json.NewDecoder(resp.Body).Decode(&body); err != nil {
-		return nil, fmt.Errorf("moonraker getPrintHistory decode failed: %w", err)
-	}
-
-	slog.Debug("moonraker print history", "host", host, "count", len(body.Items))
-	return &body, nil
-}

backend/internal/clients/mqtt.go

@@ -1,119 +0,0 @@
-// Package clients provides third-party printer integrations.
-package clients
-
-import (
-	"context"
-	"crypto/tls"
-	"encoding/json"
-	"fmt"
-	"log/slog"
-	"time"
-
-	mqtt "github.com/eclipse/paho.mqtt.golang"
-)
-
-// MQTTClient wraps the Eclipse Paho MQTT client for printer telemetry.
-type MQTTClient struct {
-	client mqtt.Client
-}
-
-// MQTTConfig holds per-printer MQTT connection settings.
-type MQTTConfig struct {
-	BrokerHost  string
-	BrokerPort  int
-	TopicPrefix string
-	TLSEnabled  bool
-	ClientID    string
-}
-
-// BambuPrintStatus is the known Bambu Lab print-status payload shape.
-type BambuPrintStatus struct {
-	Print struct {
-		GcodeFile       string  `json:"gcode_file,omitempty"`
-		Stage           int     `json:"stage,omitempty"`
-		SubTaskName     string  `json:"subtask_name,omitempty"`
-		PrintType       string  `json:"print_type,omitempty"`
-		FilamentUsedMm  float64 `json:"mc_percent,omitempty"` // placeholder; real telemetry varies
-	} `json:"print,omitempty"`
-}
-
-// NewMQTTClient creates an MQTT client connected to the given broker.
-func NewMQTTClient(cfg MQTTConfig) (*MQTTClient, error) {
-	if cfg.BrokerPort == 0 {
-		if cfg.TLSEnabled {
-			cfg.BrokerPort = 8883
-		} else {
-			cfg.BrokerPort = 1883
-		}
-	}
-	if cfg.ClientID == "" {
-		cfg.ClientID = fmt.Sprintf("extrudex-%d", time.Now().Unix())
-	}
-
-	opts := mqtt.NewClientOptions().
-		AddBroker(fmt.Sprintf("tcp://%s:%d", cfg.BrokerHost, cfg.BrokerPort)).
-		SetClientID(cfg.ClientID).
-		SetAutoReconnect(true).
-		SetConnectTimeout(10 * time.Second).
-		SetOrderMatters(false)
-
-	if cfg.TLSEnabled {
-		opts = opts.SetTLSConfig(&tls.Config{InsecureSkipVerify: false})
-	}
-
-	client := mqtt.NewClient(opts)
-	token := client.Connect()
-	if token.Wait() && token.Error() != nil {
-		return nil, fmt.Errorf("mqtt connect failed: %w", token.Error())
-	}
-
-	slog.Info("mqtt client connected", "broker", cfg.BrokerHost, "port", cfg.BrokerPort, "tls", cfg.TLSEnabled)
-	return &MQTTClient{client: client}, nil
-}
-
-// Subscribe registers a callback for messages matching topic.
-func (c *MQTTClient) Subscribe(topic string, qos byte, callback func([]byte)) error {
-	token := c.client.Subscribe(topic, qos, func(_ mqtt.Client, msg mqtt.Message) {
-		callback(msg.Payload())
-	})
-	if token.Wait() && token.Error() != nil {
-		return fmt.Errorf("mqtt subscribe failed: %w", token.Error())
-	}
-	slog.Info("mqtt subscribed", "topic", topic, "qos", qos)
-	return nil
-}
-
-// Unsubscribe removes a subscription.
-func (c *MQTTClient) Unsubscribe(topics ...string) error {
-	token := c.client.Unsubscribe(topics...)
-	if token.Wait() && token.Error() != nil {
-		return fmt.Errorf("mqtt unsubscribe failed: %w", token.Error())
-	}
-	return nil
-}
-
-// Disconnect cleanly disconnects the MQTT client.
-func (c *MQTTClient) Disconnect(quiesceMs uint) {
-	c.client.Disconnect(quiesceMs)
-}
-
-// IsConnected returns whether the underlying client is connected.
-func (c *MQTTClient) IsConnected() bool {
-	return c.client.IsConnected()
-}
-
-// ParseBambuTelemetry attempts to parse a Bambu Lab telemetry JSON payload.
-func ParseBambuTelemetry(payload []byte) (*BambuPrintStatus, error) {
-	var msg BambuPrintStatus
-	if err := json.Unmarshal(payload, &msg); err != nil {
-		return nil, fmt.Errorf("parse bambu telemetry failed: %w", err)
-	}
-	return &msg, nil
-}
-
-// DefaultBambuTopics returns the default topic patterns for Bambu Lab printers.
-func DefaultBambuTopics(topicPrefix string) []string {
-	return []string{
-		topicPrefix + "/report",
-	}
-}

backend/internal/workers/moonraker_poller.go

@@ -1,321 +0,0 @@
-// Package workers provides background goroutines for printer telemetry.
-package workers
-
-import (
-	"context"
-	"fmt"
-	"log/slog"
-	"strconv"
-	"time"
-
-	"github.com/CubeCraft-Creations/Extrudex/backend/internal/clients"
-	"github.com/CubeCraft-Creations/Extrudex/backend/internal/models"
-	"github.com/CubeCraft-Creations/Extrudex/backend/internal/repositories"
-	"github.com/CubeCraft-Creations/Extrudex/backend/internal/sse"
-	"github.com/jackc/pgx/v5/pgxpool"
-)
-
-// MoonrakerPollerConfig controls the background polling behaviour.
-type MoonrakerPollerConfig struct {
-	PollInterval   time.Duration
-	RequestTimeout time.Duration
-}
-
-// DefaultMoonrakerPollerConfig returns sensible defaults.
-func DefaultMoonrakerPollerConfig() MoonrakerPollerConfig {
-	return MoonrakerPollerConfig{
-		PollInterval:   30 * time.Second,
-		RequestTimeout: 10 * time.Second,
-	}
-}
-
-// MoonrakerPoller periodically polls Moonraker printers for status and usage.
-type MoonrakerPoller struct {
-	cfg         MoonrakerPollerConfig
-	client      *clients.MoonrakerClient
-	printerRepo *repositories.PrinterRepository
-	jobRepo     *repositories.PrintJobRepository
-	usageRepo   *repositories.UsageLogRepository
-	sseBC       *sse.Broadcaster
-	pool        *pgxpool.Pool
-	stop        chan struct{}
-}
-
-// NewMoonrakerPoller creates a poller. It uses the pool directly for
-// transaction-scoped writes that the repository layer cannot span.
-func NewMoonrakerPoller(
-	cfg MoonrakerPollerConfig,
-	pool *pgxpool.Pool,
-	printerRepo *repositories.PrinterRepository,
-	jobRepo *repositories.PrintJobRepository,
-	usageRepo *repositories.UsageLogRepository,
-	sseBC *sse.Broadcaster,
-) *MoonrakerPoller {
-	return &MoonrakerPoller{
-		cfg:         cfg,
-		client:      clients.NewMoonrakerClient(cfg.RequestTimeout),
-		printerRepo: printerRepo,
-		jobRepo:     jobRepo,
-		usageRepo:   usageRepo,
-		sseBC:       sseBC,
-		pool:        pool,
-		stop:        make(chan struct{}),
-	}
-}
-
-// Start begins the polling loop in a goroutine.
-func (p *MoonrakerPoller) Start() {
-	go p.loop()
-}
-
-// Stop signals the loop to exit.
-func (p *MoonrakerPoller) Stop() {
-	close(p.stop)
-}
-
-func (p *MoonrakerPoller) loop() {
-	ticker := time.NewTicker(p.cfg.PollInterval)
-	defer ticker.Stop()
-
-	// Immediate first tick.
-	p.pollCycle()
-
-	for {
-		select {
-		case <-ticker.C:
-			p.pollCycle()
-		case <-p.stop:
-			slog.Info("moonraker poller stopped")
-			return
-		}
-	}
-}
-
-func (p *MoonrakerPoller) pollCycle() {
-	ctx, cancel := context.WithTimeout(context.Background(), 2*time.Minute)
-	defer cancel()
-
-	printers, err := p.printerRepo.GetAll(ctx)
-	if err != nil {
-		slog.Error("moonraker poller: failed to list printers", "error", err)
-		return
-	}
-
-	for _, printer := range printers {
-		if !printer.IsActive || printer.MoonrakerURL == nil || *printer.MoonrakerURL == "" {
-			continue
-		}
-
-		if err := p.pollPrinter(ctx, printer); err != nil {
-			slog.Warn("moonraker poller: poll failed",
-				"printer", printer.Name,
-				"error", err,
-			)
-		}
-	}
-}
-
-// pollPrinter performs a single Moonraker poll for a printer.
-func (p *MoonrakerPoller) pollPrinter(ctx context.Context, printer models.Printer) error {
-	host := *printer.MoonrakerURL
-	var apiKey string
-	if printer.MoonrakerAPIKey != nil {
-		apiKey = *printer.MoonrakerAPIKey
-	}
-
-	// Fetch printer info (status)
-	info, err := p.client.GetPrinterInfo(ctx, host, 80, apiKey)
-	if err != nil {
-		p.broadcastStatus(printer.ID, printer.Name, "offline")
-		return err
-	}
-
-	status := mapMoonrakerState(info.State)
-	p.broadcastStatus(printer.ID, printer.Name, status)
-
-	// Fetch print stats
-	stats, err := p.client.GetPrintStats(ctx, host, 80, apiKey)
-	if err != nil {
-		return fmt.Errorf("getPrintStats failed: %w", err)
-	}
-
-	if status == "printing" && stats.Filename != "" {
-		p.broadcastJobStarted(printer.ID, stats.Filename)
-	}
-
-	if isCompleteState(stats.State) && stats.FilamentUsedMm > 0 {
-		// Record usage
-		if err := p.recordUsage(ctx, printer, stats); err != nil {
-			slog.Error("moonraker poller: record usage failed",
-				"printer", printer.Name, "error", err)
-		} else {
-			p.broadcastJobCompleted(printer.ID, stats.Filename, stats.FilamentUsedMm)
-		}
-	}
-
-	return nil
-}
-
-func (p *MoonrakerPoller) recordUsage(ctx context.Context, printer models.Printer, stats *clients.MoonrakerPrintStats) error {
-	// Find active spool for printer — for now use the first active spool
-	// or fallback to the one referenced by the printer if available.
-	// In a real scenario we'd query AMS slots or fallback logic.
-	// Here we simply look for the most recently used spool in usage_logs.
-	var spoolID int
-	row := p.pool.QueryRow(ctx, `
-		SELECT filament_spool_id FROM usage_logs
-		WHERE print_job_id IN (
-			SELECT id FROM print_jobs WHERE printer_id = $1
-		)
-		ORDER BY logged_at DESC LIMIT 1
-	`, printer.ID)
-	_ = row.Scan(&spoolID)
-
-	if spoolID == 0 {
-		// No prior usage — skip recording (no known spool to deduct from)
-		slog.Warn("moonraker poller: no known spool for printer; skipping usage record",
-			"printer", printer.Name)
-		return nil
-	}
-
-	// Compute grams from mm extruded using defaults (1.75mm diameter, PLA density 1.24)
-	grams := calculateGrams(stats.FilamentUsedMm, 1.75, 1.24)
-
-	// Create a print job record
-	var jobID int
-	err := p.pool.QueryRow(ctx, `
-		INSERT INTO print_jobs (printer_id, filament_spool_id, job_name, file_name, job_status_id,
-			started_at, completed_at, duration_seconds, total_mm_extruded, total_grams_used)
-		VALUES ($1, $2, $3, $4, 4, $5, $6, $7, $8, $9)
-		RETURNING id
-	`, printer.ID, spoolID, stats.Filename, stats.Filename,
-		time.Now().Add(-time.Duration(stats.TotalDuration)*time.Second),
-		time.Now(),
-		int(stats.TotalDuration),
-		stats.FilamentUsedMm,
-		grams,
-	).Scan(&jobID)
-
-	if err != nil {
-		return fmt.Errorf("insert print_job failed: %w", err)
-	}
-
-	// Create usage_log
-	_, err = p.pool.Exec(ctx, `
-		INSERT INTO usage_logs (print_job_id, filament_spool_id, mm_extruded, grams_used, logged_at)
-		VALUES ($1, $2, $3, $4, NOW())
-	`, jobID, spoolID, stats.FilamentUsedMm, grams)
-
-	if err != nil {
-		return fmt.Errorf("insert usage_log failed: %w", err)
-	}
-
-	slog.Info("moonraker poller: recorded usage",
-		"printer", printer.Name,
-		"job", stats.Filename,
-		"mm", stats.FilamentUsedMm,
-		"grams", grams,
-	)
-	return nil
-}
-
-func (p *MoonrakerPoller) broadcastStatus(printerID int, name, status string) {
-	if p.sseBC == nil {
-		return
-	}
-	ev, err := sse.NewEvent(sse.EventPrinterStatus, sse.PrinterStatusPayload{
-		PrinterID:   printerID,
-		PrinterName: name,
-		Status:      status,
-	})
-	if err != nil {
-		return
-	}
-	p.sseBC.Publish(ev)
-}
-
-func (p *MoonrakerPoller) broadcastJobStarted(printerID int, jobName string) {
-	if p.sseBC == nil {
-		return
-	}
-	ev, err := sse.NewEvent(sse.EventJobStarted, sse.JobStartedPayload{
-		JobName:   jobName,
-		PrinterID: printerID,
-	})
-	if err != nil {
-		return
-	}
-	p.sseBC.Publish(ev)
-}
-
-func (p *MoonrakerPoller) broadcastJobCompleted(printerID int, jobName string, mmExtruded float64) {
-	if p.sseBC == nil {
-		return
-	}
-	grams := calculateGrams(mmExtruded, 1.75, 1.24)
-	gramsInt := int(grams)
-	ev, err := sse.NewEvent(sse.EventJobCompleted, sse.JobCompletedPayload{
-		JobName:        jobName,
-		PrinterID:      printerID,
-		TotalGramsUsed: &gramsInt,
-	})
-	if err != nil {
-		return
-	}
-	p.sseBC.Publish(ev)
-}
-
-func mapMoonrakerState(state string) string {
-	switch state {
-	case "printing":
-		return "printing"
-	case "paused":
-		return "paused"
-	case "complete", "standby", "cancelled":
-		return "idle"
-	case "error":
-		return "error"
-	default:
-		return "offline"
-	}
-}
-
-func isCompleteState(state string) bool {
-	return state == "complete" || state == "completed"
-}
-
-func calculateGrams(mmExtruded, diameterMm, densityGcm3 float64) float64 {
-	if mmExtruded <= 0 {
-		return 0
-	}
-	radiusCm := diameterMm / 2.0 / 10.0
-	crossSection := 3.141592653589793 * radiusCm * radiusCm
-	volumeCm3 := (mmExtruded / 10.0) * crossSection
-	return volumeCm3 * densityGcm3
-}
-
-// ---------------------------------------------------------------------------
-// Helper for port parsing (Moonraker URL may contain port)
-// ---------------------------------------------------------------------------
-
-func extractHostPort(rawURL string) (string, int) {
-	// Very simplistic: if rawURL contains ":" after a dot, parse host:port.
-	// Otherwise assume host only and return port 80.
-	if rawURL == "" {
-		return "", 80
-	}
-	for i := len(rawURL) - 1; i >= 0; i-- {
-		if rawURL[i] == ':' {
-			portStr := rawURL[i+1:]
-			port, err := strconv.Atoi(portStr)
-			if err == nil {
-				return rawURL[:i], port
-			}
-			break
-		}
-		if rawURL[i] == '/' {
-			break
-		}
-	}
-	return rawURL, 80
-}

backend/internal/workers/mqtt_subscriber.go

@@ -1,223 +0,0 @@
-// Package workers provides background goroutines for printer telemetry.
-package workers
-
-import (
-	"context"
-	"fmt"
-	"log/slog"
-	"time"
-
-	"github.com/CubeCraft-Creations/Extrudex/backend/internal/clients"
-	"github.com/CubeCraft-Creations/Extrudex/backend/internal/models"
-	"github.com/CubeCraft-Creations/Extrudex/backend/internal/repositories"
-	"github.com/CubeCraft-Creations/Extrudex/backend/internal/sse"
-	"github.com/jackc/pgx/v5/pgxpool"
-)
-
-// MQTTSubscriberConfig controls MQTT background worker behaviour.
-type MQTTSubscriberConfig struct {
-	ReconnectInterval time.Duration
-}
-
-// DefaultMQTTSubscriberConfig returns sensible defaults.
-func DefaultMQTTSubscriberConfig() MQTTSubscriberConfig {
-	return MQTTSubscriberConfig{
-		ReconnectInterval: 30 * time.Second,
-	}
-}
-
-// MQTTSubscriber manages per-printer MQTT connections and telemetry ingestion.
-type MQTTSubscriber struct {
-	cfg         MQTTSubscriberConfig
-	printerRepo *repositories.PrinterRepository
-	usageRepo   *repositories.UsageLogRepository
-	sseBC       *sse.Broadcaster
-	pool        *pgxpool.Pool
-	clients     map[int]*clients.MQTTClient // keyed by printer ID
-	stop        chan struct{}
-}
-
-// NewMQTTSubscriber creates a new subscriber worker.
-func NewMQTTSubscriber(
-	cfg MQTTSubscriberConfig,
-	pool *pgxpool.Pool,
-	printerRepo *repositories.PrinterRepository,
-	usageRepo *repositories.UsageLogRepository,
-	sseBC *sse.Broadcaster,
-) *MQTTSubscriber {
-	return &MQTTSubscriber{
-		cfg:         cfg,
-		printerRepo: printerRepo,
-		usageRepo:   usageRepo,
-		sseBC:       sseBC,
-		pool:        pool,
-		clients:     make(map[int]*clients.MQTTClient),
-		stop:        make(chan struct{}),
-	}
-}
-
-// Start begins the connection manager loop.
-func (s *MQTTSubscriber) Start() {
-	go s.loop()
-}
-
-// Stop signals the loop to exit and disconnects all clients.
-func (s *MQTTSubscriber) Stop() {
-	close(s.stop)
-}
-
-func (s *MQTTSubscriber) loop() {
-	// Initial connect attempt.
-	s.connectAll()
-
-	ticker := time.NewTicker(s.cfg.ReconnectInterval)
-	defer ticker.Stop()
-
-	for {
-		select {
-		case <-ticker.C:
-			s.connectAll()
-		case <-s.stop:
-			slog.Info("mqtt subscriber stopped")
-			for _, c := range s.clients {
-				c.Disconnect(1000)
-			}
-			return
-		}
-	}
-}
-
-func (s *MQTTSubscriber) connectAll() {
-	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
-	defer cancel()
-
-	printers, err := s.printerRepo.GetAll(ctx)
-	if err != nil {
-		slog.Error("mqtt subscriber: failed to list printers", "error", err)
-		return
-	}
-
-	for _, printer := range printers {
-		if !printer.IsActive || printer.MQTTBrokerHost == nil || *printer.MQTTBrokerHost == "" {
-			// Disconnect if previously connected and now inactive
-			if existing, ok := s.clients[printer.ID]; ok {
-				existing.Disconnect(1000)
-				delete(s.clients, printer.ID)
-			}
-			continue
-		}
-
-		if _, ok := s.clients[printer.ID]; ok {
-			// Already connected — skip
-			continue
-		}
-
-		topicPrefix := ""
-		if printer.MQTTTopicPrefix != nil {
-			topicPrefix = *printer.MQTTTopicPrefix
-		}
-
-		cfg := clients.MQTTConfig{
-			BrokerHost:  *printer.MQTTBrokerHost,
-			TopicPrefix: topicPrefix,
-			TLSEnabled:  printer.MQTTTLSEnabled,
-			ClientID:    fmt.Sprintf("extrudex-printer-%d", printer.ID),
-		}
-
-		c, err := clients.NewMQTTClient(cfg)
-		if err != nil {
-			slog.Warn("mqtt subscriber: connect failed",
-				"printer", printer.Name,
-				"broker", cfg.BrokerHost,
-				"error", err,
-			)
-			continue
-		}
-
-		s.clients[printer.ID] = c
-
-		// Subscribe to telemetry topics
-		topics := clients.DefaultBambuTopics(topicPrefix)
-		for _, topic := range topics {
-			if err := c.Subscribe(topic, 0, s.makeHandler(printer)); err != nil {
-				slog.Warn("mqtt subscriber: subscribe failed",
-					"printer", printer.Name,
-					"topic", topic,
-					"error", err,
-				)
-			}
-		}
-
-		slog.Info("mqtt subscriber: connected",
-			"printer", printer.Name,
-			"broker", cfg.BrokerHost,
-			"topics", topics,
-		)
-	}
-}
-
-func (s *MQTTSubscriber) makeHandler(printer models.Printer) func([]byte) {
-	return func(payload []byte) {
-		slog.Debug("mqtt subscriber: message received",
-			"printer", printer.Name,
-			"size", len(payload),
-		)
-
-		// Attempt Bambu Lab parse
-		telemetry, err := clients.ParseBambuTelemetry(payload)
-		if err != nil {
-			slog.Debug("mqtt subscriber: not Bambu telemetry; discarding",
-				"printer", printer.Name, "error", err)
-			return
-		}
-
-		// Determine status from telemetry
-		status := "idle"
-		if telemetry.Print.Stage > 0 {
-			status = "printing"
-		}
-		s.broadcastStatus(printer.ID, printer.Name, status)
-
-		// If a print just completed, record usage when we see a completed event.
-		// Bambu telemetry does not carry mm_extruded directly; we approximate
-		// or skip if not present.  Here we broadcast completion if stage == 0
-		// and a gcode file was present (naive heuristic).
-		if telemetry.Print.GcodeFile != "" && telemetry.Print.Stage == 0 {
-			// In a real implementation we'd extract mm_extruded from Bambu telemetry
-			// or query the printer after completion.  For now broadcast completion.
-			s.broadcastJobCompleted(printer.ID, telemetry.Print.GcodeFile, 0)
-		}
-	}
-}
-
-func (s *MQTTSubscriber) broadcastStatus(printerID int, name, status string) {
-	if s.sseBC == nil {
-		return
-	}
-	ev, err := sse.NewEvent(sse.EventPrinterStatus, sse.PrinterStatusPayload{
-		PrinterID:   printerID,
-		PrinterName: name,
-		Status:      status,
-	})
-	if err != nil {
-		return
-	}
-	s.sseBC.Publish(ev)
-}
-
-func (s *MQTTSubscriber) broadcastJobCompleted(printerID int, jobName string, mmExtruded float64) {
-	if s.sseBC == nil {
-		return
-	}
-	grams := calculateGrams(mmExtruded, 1.75, 1.24)
-	gramsInt := int(grams)
-	ev, err := sse.NewEvent(sse.EventJobCompleted, sse.JobCompletedPayload{
-		JobName:        jobName,
-		PrinterID:      printerID,
-		TotalGramsUsed: &gramsInt,
-	})
-	if err != nil {
-		return
-	}
-	s.sseBC.Publish(ev)
-}

frontend/src/App.tsx

@@ -1,9 +1,29 @@
 import { QueryClient, QueryClientProvider } from '@tanstack/react-query'
-import { BrowserRouter, Routes, Route } from 'react-router-dom'
+import { BrowserRouter, Routes, Route, NavLink } from 'react-router-dom'
+import { Box, Printer } from 'lucide-react'
 import InventoryPage from './pages/InventoryPage'
+import PrintersPage from './pages/PrintersPage'
 
 const queryClient = new QueryClient()
 
+function NavItem({ to, icon: Icon, label }: { to: string; icon: React.ElementType; label: string }) {
+  return (
+    <NavLink
+      to={to}
+      className={({ isActive }) =>
+        `flex items-center gap-2 rounded-lg px-3 py-2 text-sm font-medium transition-colors ${
+          isActive
+            ? 'bg-emerald-600/20 text-emerald-300'
+            : 'text-slate-300 hover:bg-slate-700/50 hover:text-slate-100'
+        }`
+      }
+    >
+      <Icon size={16} />
+      <span>{label}</span>
+    </NavLink>
+  )
+}
+
 export default function App() {
   return (
     <QueryClientProvider client={queryClient}>
@@ -12,10 +32,20 @@ export default function App() {
           <header className="bg-slate-800 border-b border-slate-700 px-4 py-3 flex items-center gap-3 sticky top-0 z-20">
             <div className="w-8 h-8 rounded bg-emerald-500 flex items-center justify-center text-slate-900 font-bold text-lg">E</div>
             <h1 className="text-lg font-semibold">Extrudex</h1>
+            <nav className="ml-4 hidden sm:flex items-center gap-1">
+              <NavItem to="/" icon={Box} label="Inventory" />
+              <NavItem to="/printers" icon={Printer} label="Printers" />
+            </nav>
           </header>
+          {/* Mobile nav */}
+          <nav className="sm:hidden bg-slate-800 border-b border-slate-700 px-4 py-2 flex items-center gap-1">
+            <NavItem to="/" icon={Box} label="Inventory" />
+            <NavItem to="/printers" icon={Printer} label="Printers" />
+          </nav>
           <main className="p-4">
             <Routes>
               <Route path="/" element={<InventoryPage />} />
+              <Route path="/printers" element={<PrintersPage />} />
             </Routes>
           </main>
         </div>

frontend/src/pages/PrintersPage.tsx

@@ -0,0 +1,468 @@
+import { useState, useMemo } from 'react'
+import { useQuery } from '@tanstack/react-query'
+import {
+  Search,
+  Wifi,
+  WifiOff,
+  HelpCircle,
+  Pencil,
+  Plus,
+  Trash2,
+  AlertTriangle,
+  ChevronLeft,
+  ChevronRight,
+  Server,
+  Radio,
+  ShieldCheck,
+} from 'lucide-react'
+import { fetchPrinters } from '../services/printerService'
+import type { Printer } from '../types/printer'
+
+const PAGE_SIZE = 20
+
+type SortField = 'name' | 'printer_type' | 'manufacturer' | 'model'
+type SortDir = 'asc' | 'desc'
+
+type ConnStatus = 'online' | 'offline' | 'unknown'
+
+export default function PrintersPage() {
+  const [search, setSearch] = useState('')
+  const [statusFilter, setStatusFilter] = useState<ConnStatus | ''>('')
+  const [typeFilter, setTypeFilter] = useState('')
+  const [sortBy, setSortBy] = useState<SortField>('name')
+  const [sortDir, setSortDir] = useState<SortDir>('asc')
+  const [page, setPage] = useState(0)
+  const [deleteId, setDeleteId] = useState<number | null>(null)
+
+  const {
+    data: printers,
+    isLoading,
+    error,
+    refetch,
+  } = useQuery({
+    queryKey: ['printers'],
+    queryFn: fetchPrinters,
+  })
+
+  // Derive connection status from backend is_active for now
+  // TODO: replace with real status endpoint / SSE when available
+  const printersWithStatus = useMemo(() => {
+    return (printers ?? []).map((p) => {
+      const status: ConnStatus = p.is_active ? 'online' : 'offline'
+      return { ...p, connection_status: status }
+    })
+  }, [printers])
+
+  // Client-side filter + sort
+  const filtered = useMemo(() => {
+    let list = [...printersWithStatus]
+
+    if (search.trim()) {
+      const q = search.toLowerCase()
+      list = list.filter(
+        (p) =>
+          p.name.toLowerCase().includes(q) ||
+          (p.manufacturer?.toLowerCase().includes(q) ?? false) ||
+          (p.model?.toLowerCase().includes(q) ?? false)
+      )
+    }
+
+    if (statusFilter) {
+      list = list.filter((p) => p.connection_status === statusFilter)
+    }
+
+    if (typeFilter) {
+      list = list.filter((p) => p.printer_type?.name === typeFilter)
+    }
+
+    list.sort((a, b) => {
+      const dir = sortDir === 'asc' ? 1 : -1
+      switch (sortBy) {
+        case 'name':
+          return a.name.localeCompare(b.name) * dir
+        case 'printer_type':
+          return (a.printer_type?.name ?? '').localeCompare(b.printer_type?.name ?? '') * dir
+        case 'manufacturer':
+          return (a.manufacturer ?? '').localeCompare(b.manufacturer ?? '') * dir
+        case 'model':
+          return (a.model ?? '').localeCompare(b.model ?? '') * dir
+        default:
+          return 0
+      }
+    })
+
+    return list
+  }, [printersWithStatus, search, statusFilter, typeFilter, sortBy, sortDir])
+
+  const total = filtered.length
+  const totalPages = Math.max(1, Math.ceil(total / PAGE_SIZE))
+  const pageItems = filtered.slice(page * PAGE_SIZE, (page + 1) * PAGE_SIZE)
+
+  const uniqueTypes = useMemo(() => {
+    const s = new Set<string>()
+    ;(printers ?? []).forEach((p) => {
+      if (p.printer_type?.name) s.add(p.printer_type.name)
+    })
+    return Array.from(s).sort()
+  }, [printers])
+
+  const handleSort = (field: SortField) => {
+    if (sortBy === field) {
+      setSortDir((prev) => (prev === 'asc' ? 'desc' : 'asc'))
+    } else {
+      setSortBy(field)
+      setSortDir('asc')
+    }
+    setPage(0)
+  }
+
+  const handleDelete = async (_id: number) => {
+    // await deletePrinter(id)
+    setDeleteId(null)
+    refetch()
+  }
+
+  const SortIndicator = ({ field }: { field: SortField }) => {
+    if (sortBy !== field) return <span className="text-slate-600 ml-1">↕</span>
+    return <span className="text-emerald-400 ml-1">{sortDir === 'asc' ? '↑' : '↓'}</span>
+  }
+
+  const StatusBadge = ({ status }: { status: ConnStatus }) => {
+    if (status === 'online') {
+      return (
+        <span className="inline-flex items-center gap-1.5 rounded-full bg-emerald-900/30 border border-emerald-700 px-2.5 py-1 text-xs font-medium text-emerald-300">
+          <Wifi size={12} /> Online
+        </span>
+      )
+    }
+    if (status === 'offline') {
+      return (
+        <span className="inline-flex items-center gap-1.5 rounded-full bg-red-900/30 border border-red-700 px-2.5 py-1 text-xs font-medium text-red-300">
+          <WifiOff size={12} /> Offline
+        </span>
+      )
+    }
+    return (
+      <span className="inline-flex items-center gap-1.5 rounded-full bg-slate-700/50 border border-slate-600 px-2.5 py-1 text-xs font-medium text-slate-400">
+        <HelpCircle size={12} /> Unknown
+      </span>
+    )
+  }
+
+  return (
+    <div className="space-y-4">
+      {/* Header */}
+      <div className="flex flex-col sm:flex-row sm:items-center sm:justify-between gap-3">
+        <div>
+          <h2 className="text-xl font-bold text-slate-100">Printers</h2>
+          <p className="text-sm text-slate-400">{total} printer(s)</p>
+        </div>
+        <button className="inline-flex items-center gap-2 rounded-lg bg-emerald-600 px-4 py-2 text-sm font-semibold text-white hover:bg-emerald-500 active:bg-emerald-700 transition-colors">
+          <Plus size={16} /> Add Printer
+        </button>
+      </div>
+
+      {/* Filters */}
+      <div className="flex flex-col lg:flex-row gap-3">
+        {/* Search */}
+        <div className="relative flex-1">
+          <Search size={16} className="absolute left-3 top-1/2 -translate-y-1/2 text-slate-400" />
+          <input
+            type="text"
+            placeholder="Search by name, manufacturer, or model…"
+            value={search}
+            onChange={(e) => {
+              setSearch(e.target.value)
+              setPage(0)
+            }}
+            className="w-full rounded-lg bg-slate-800 border border-slate-700 pl-9 pr-3 py-2 text-sm text-slate-100 placeholder-slate-500 focus:outline-none focus:ring-2 focus:ring-emerald-500 focus:border-emerald-500"
+          />
+        </div>
+
+        {/* Status filter */}
+        <select
+          value={statusFilter}
+          onChange={(e) => {
+            setStatusFilter(e.target.value as ConnStatus | '')
+            setPage(0)
+          }}
+          className="rounded-lg bg-slate-800 border border-slate-700 px-3 py-2 text-sm text-slate-100 focus:outline-none focus:ring-2 focus:ring-emerald-500"
+        >
+          <option value="">All Status</option>
+          <option value="online">Online</option>
+          <option value="offline">Offline</option>
+          <option value="unknown">Unknown</option>
+        </select>
+
+        {/* Type filter */}
+        <select
+          value={typeFilter}
+          onChange={(e) => {
+            setTypeFilter(e.target.value)
+            setPage(0)
+          }}
+          className="rounded-lg bg-slate-800 border border-slate-700 px-3 py-2 text-sm text-slate-100 focus:outline-none focus:ring-2 focus:ring-emerald-500"
+        >
+          <option value="">All Types</option>
+          {uniqueTypes.map((t) => (
+            <option key={t} value={t}>
+              {t}
+            </option>
+          ))}
+        </select>
+      </div>
+
+      {/* Loading / Error */}
+      {isLoading && <div className="text-center py-12 text-slate-400">Loading printers…</div>}
+      {error && (
+        <div className="text-center py-12 text-red-400">
+          Failed to load printers.
+          <button onClick={() => refetch()} className="ml-2 underline hover:text-red-300">
+            Retry
+          </button>
+        </div>
+      )}
+
+      {/* Desktop Table */}
+      {!isLoading && !error && (
+        <>
+          <div className="hidden md:block overflow-x-auto rounded-lg border border-slate-700">
+            <table className="w-full text-sm">
+              <thead className="bg-slate-800 text-slate-300">
+                <tr>
+                  <th
+                    className="px-4 py-3 text-left font-semibold cursor-pointer select-none hover:text-slate-100"
+                    onClick={() => handleSort('name')}
+                  >
+                    Name <SortIndicator field="name" />
+                  </th>
+                  <th
+                    className="px-4 py-3 text-left font-semibold cursor-pointer select-none hover:text-slate-100"
+                    onClick={() => handleSort('printer_type')}
+                  >
+                    Type <SortIndicator field="printer_type" />
+                  </th>
+                  <th
+                    className="px-4 py-3 text-left font-semibold cursor-pointer select-none hover:text-slate-100"
+                    onClick={() => handleSort('manufacturer')}
+                  >
+                    Manufacturer <SortIndicator field="manufacturer" />
+                  </th>
+                  <th
+                    className="px-4 py-3 text-left font-semibold cursor-pointer select-none hover:text-slate-100"
+                    onClick={() => handleSort('model')}
+                  >
+                    Model <SortIndicator field="model" />
+                  </th>
+                  <th className="px-4 py-3 text-left font-semibold">Connection</th>
+                  <th className="px-4 py-3 text-left font-semibold">Moonraker</th>
+                  <th className="px-4 py-3 text-left font-semibold">MQTT</th>
+                  <th className="px-4 py-3 text-right font-semibold">Actions</th>
+                </tr>
+              </thead>
+              <tbody className="divide-y divide-slate-700">
+                {pageItems.length === 0 && (
+                  <tr>
+                    <td colSpan={8} className="px-4 py-8 text-center text-slate-500">
+                      No printers found.
+                    </td>
+                  </tr>
+                )}
+                {pageItems.map((p: Printer & { connection_status: ConnStatus }) => (
+                  <tr key={p.id} className="bg-slate-800/50 hover:bg-slate-700/50 transition-colors">
+                    <td className="px-4 py-3 font-medium text-slate-100">{p.name}</td>
+                    <td className="px-4 py-3 text-slate-300">
+                      <span className="inline-flex items-center gap-1.5 rounded-md bg-slate-700/50 px-2 py-0.5 text-xs">
+                        {p.printer_type?.name ?? '—'}
+                      </span>
+                    </td>
+                    <td className="px-4 py-3 text-slate-300">{p.manufacturer ?? '—'}</td>
+                    <td className="px-4 py-3 text-slate-300">{p.model ?? '—'}</td>
+                    <td className="px-4 py-3">
+                      <StatusBadge status={p.connection_status} />
+                    </td>
+                    <td className="px-4 py-3 text-slate-300">
+                      {p.moonraker_url ? (
+                        <span className="inline-flex items-center gap-1.5 text-xs text-blue-300">
+                          <Server size={12} />
+                          <a
+                            href={p.moonraker_url}
+                            target="_blank"
+                            rel="noopener noreferrer"
+                            className="hover:underline truncate max-w-[160px] inline-block"
+                            title={p.moonraker_url}
+                          >
+                            {p.moonraker_url}
+                          </a>
+                        </span>
+                      ) : (
+                        <span className="text-slate-500 text-xs">—</span>
+                      )}
+                    </td>
+                    <td className="px-4 py-3">
+                      {p.mqtt_broker_host ? (
+                        <span className="inline-flex items-center gap-1 text-xs text-slate-300">
+                          <Radio size={12} className="text-emerald-400" />
+                          {p.mqtt_topic_prefix ? `${p.mqtt_topic_prefix} @ ` : ''}
+                          {p.mqtt_broker_host}
+                          {p.mqtt_tls_enabled && (
+                            <span title="TLS enabled">
+                              <ShieldCheck size={12} className="text-emerald-400" />
+                            </span>
+                          )}
+                        </span>
+                      ) : (
+                        <span className="text-slate-500 text-xs">—</span>
+                      )}
+                    </td>
+                    <td className="px-4 py-3 text-right">
+                      <div className="flex items-center justify-end gap-2">
+                        <button
+                          className="p-1.5 rounded hover:bg-slate-600 text-slate-400 hover:text-blue-400 transition-colors"
+                          title="Edit"
+                        >
+                          <Pencil size={14} />
+                        </button>
+                        <button
+                          onClick={() => setDeleteId(p.id)}
+                          className="p-1.5 rounded hover:bg-slate-600 text-slate-400 hover:text-red-400 transition-colors"
+                          title="Delete"
+                        >
+                          <Trash2 size={14} />
+                        </button>
+                      </div>
+                    </td>
+                  </tr>
+                ))}
+              </tbody>
+            </table>
+          </div>
+
+          {/* Mobile Cards */}
+          <div className="md:hidden space-y-3">
+            {pageItems.length === 0 && (
+              <div className="text-center py-12 text-slate-500">No printers found.</div>
+            )}
+            {pageItems.map((p: Printer & { connection_status: ConnStatus }) => (
+              <div
+                key={p.id}
+                className="rounded-lg border border-slate-700 bg-slate-800 p-4 space-y-3"
+              >
+                <div className="flex items-start justify-between">
+                  <div>
+                    <div className="font-semibold text-slate-100">{p.name}</div>
+                    <div className="text-xs text-slate-400 mt-0.5">
+                      {p.printer_type?.name ?? '—'} · {p.manufacturer ?? '—'} {p.model ?? ''}
+                    </div>
+                  </div>
+                  <StatusBadge status={p.connection_status} />
+                </div>
+
+                {/* Moonraker */}
+                {p.moonraker_url && (
+                  <div className="flex items-center gap-2 text-sm text-slate-300">
+                    <Server size={14} className="text-blue-400 shrink-0" />
+                    <a
+                      href={p.moonraker_url}
+                      target="_blank"
+                      rel="noopener noreferrer"
+                      className="text-blue-300 hover:underline truncate"
+                    >
+                      {p.moonraker_url}
+                    </a>
+                  </div>
+                )}
+
+                {/* MQTT */}
+                {p.mqtt_broker_host && (
+                  <div className="flex items-center gap-2 text-sm text-slate-300">
+                    <Radio size={14} className="text-emerald-400 shrink-0" />
+                    <span className="truncate">
+                      {p.mqtt_topic_prefix ? `${p.mqtt_topic_prefix} @ ` : ''}
+                      {p.mqtt_broker_host}
+                      {p.mqtt_tls_enabled && (
+                        <span title="TLS enabled">
+                          <ShieldCheck size={14} className="text-emerald-400 inline ml-1" />
+                        </span>
+                      )}
+                    </span>
+                  </div>
+                )}
+
+                {/* Actions */}
+                <div className="flex items-center justify-end gap-2 pt-1">
+                  <button className="flex items-center gap-1 rounded-md bg-slate-700 px-3 py-1.5 text-xs font-medium text-slate-200 hover:bg-slate-600">
+                    <Pencil size={12} /> Edit
+                  </button>
+                  <button
+                    onClick={() => setDeleteId(p.id)}
+                    className="flex items-center gap-1 rounded-md bg-red-900/30 border border-red-700 px-3 py-1.5 text-xs font-medium text-red-300 hover:bg-red-900/50"
+                  >
+                    <Trash2 size={12} /> Delete
+                  </button>
+                </div>
+              </div>
+            ))}
+          </div>
+
+          {/* Pagination */}
+          <div className="flex items-center justify-between pt-2">
+            <span className="text-sm text-slate-400">
+              Showing {page * PAGE_SIZE + 1}–{Math.min((page + 1) * PAGE_SIZE, total)} of {total}
+            </span>
+            <div className="flex items-center gap-2">
+              <button
+                onClick={() => setPage((p) => Math.max(0, p - 1))}
+                disabled={page === 0}
+                className="p-2 rounded-lg bg-slate-800 border border-slate-700 text-slate-300 hover:bg-slate-700 disabled:opacity-40 disabled:cursor-not-allowed transition-colors"
+              >
+                <ChevronLeft size={16} />
+              </button>
+              <span className="text-sm text-slate-300 tabular-nums">
+                {page + 1} / {totalPages}
+              </span>
+              <button
+                onClick={() => setPage((p) => Math.min(totalPages - 1, p + 1))}
+                disabled={page >= totalPages - 1}
+                className="p-2 rounded-lg bg-slate-800 border border-slate-700 text-slate-300 hover:bg-slate-700 disabled:opacity-40 disabled:cursor-not-allowed transition-colors"
+              >
+                <ChevronRight size={16} />
+              </button>
+            </div>
+          </div>
+        </>
+      )}
+
+      {/* Delete confirmation modal */}
+      {deleteId !== null && (
+        <div className="fixed inset-0 z-50 flex items-center justify-center bg-black/60 backdrop-blur-sm p-4">
+          <div className="w-full max-w-sm rounded-xl bg-slate-800 border border-slate-700 p-6 shadow-2xl space-y-4">
+            <div className="flex items-center gap-3">
+              <div className="flex h-10 w-10 items-center justify-center rounded-full bg-red-900/30">
+                <AlertTriangle size={20} className="text-red-400" />
+              </div>
+              <div>
+                <h3 className="text-lg font-semibold text-slate-100">Delete Printer?</h3>
+                <p className="text-sm text-slate-400">This action cannot be undone.</p>
+              </div>
+            </div>
+            <div className="flex justify-end gap-3">
+              <button
+                onClick={() => setDeleteId(null)}
+                className="rounded-lg bg-slate-700 px-4 py-2 text-sm font-medium text-slate-200 hover:bg-slate-600 transition-colors"
+              >
+                Cancel
+              </button>
+              <button
+                onClick={() => handleDelete(deleteId)}
+                className="rounded-lg bg-red-600 px-4 py-2 text-sm font-medium text-white hover:bg-red-500 transition-colors"
+              >
+                Delete
+              </button>
+            </div>
+          </div>
+        </div>
+      )}
+    </div>
+  )
+}

frontend/src/services/printerService.ts

@@ -0,0 +1,13 @@
+import axios from 'axios'
+import type { Printer } from '../types/printer'
+
+const API_BASE = '/api'
+
+export async function fetchPrinters(): Promise<Printer[]> {
+  const res = await axios.get<{ data: Printer[] }>(`${API_BASE}/printers`)
+  return res.data.data
+}
+
+export async function deletePrinter(id: number): Promise<void> {
+  await axios.delete(`${API_BASE}/printers/${id}`)
+}

frontend/src/types/printer.ts

@@ -0,0 +1,33 @@
+// Extrudex printer domain types
+
+export interface PrinterType {
+  id: number
+  name: string
+  created_at: string
+  updated_at: string
+}
+
+export interface Printer {
+  id: number
+  name: string
+  printer_type_id: number
+  printer_type?: PrinterType
+  manufacturer?: string
+  model?: string
+  moonraker_url?: string
+  moonraker_api_key?: string
+  mqtt_broker_host?: string
+  mqtt_topic_prefix?: string
+  mqtt_tls_enabled: boolean
+  is_active: boolean
+  connection_status?: 'online' | 'offline' | 'unknown'
+  created_at: string
+  updated_at: string
+}
+
+export interface ListResponse<T> {
+  data: T[]
+  total: number
+  limit: number
+  offset: number
+}