service.go

package main

import (
	"context"
	"embed"
	"fmt"
	"html/template"
	"log"
	"net/http"
	"time"

	"github.com/gorilla/mux"
)

//go:embed web/templates/*
var templateFS embed.FS

// PrintServer manages the HTTP server and routes
type PrintServer struct {
	httpServer *http.Server
	config     *Config
	templates  *template.Template
}

// NewPrintServer creates a new PrintServer instance
func NewPrintServer() *PrintServer {
	tmpl, err := template.ParseFS(templateFS, "web/templates/*.html")
	if err != nil {
		log.Printf("Warning: Could not parse templates: %v", err)
		tmpl = template.New("empty")
	}

	return &PrintServer{
		config:    LoadConfig(),
		templates: tmpl,
	}
}

// Start begins the HTTP server
func (ps *PrintServer) Start() error {
	router := mux.NewRouter()

	// API routes
	api := router.PathPrefix("/api").Subrouter()
	api.Use(corsMiddleware)

	api.HandleFunc("/health", ps.HealthCheckHandler).Methods("GET", "OPTIONS")
	api.HandleFunc("/printers", ps.ListPrintersHandler).Methods("GET", "OPTIONS")
	api.HandleFunc("/config", ps.GetConfigHandler).Methods("GET", "OPTIONS")
	api.HandleFunc("/config", ps.SetConfigHandler).Methods("POST", "OPTIONS")
	api.HandleFunc("/print", ps.PrintHandler).Methods("POST", "OPTIONS")

	// Web interface
	router.HandleFunc("/", ps.SettingsPageHandler).Methods("GET")
	router.HandleFunc("/settings", ps.SettingsPageHandler).Methods("GET")

	ps.httpServer = &http.Server{
		Addr:         fmt.Sprintf(":%d", ps.config.Port),
		Handler:      router,
		ReadTimeout:  15 * time.Second,
		WriteTimeout: 15 * time.Second,
		IdleTimeout:  60 * time.Second,
	}

	log.Printf("Starting server on port %d", ps.config.Port)
	return ps.httpServer.ListenAndServe()
}

// Stop gracefully shuts down the server
func (ps *PrintServer) Stop() error {
	if ps.httpServer != nil {
		ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
		defer cancel()
		return ps.httpServer.Shutdown(ctx)
	}
	return nil
}

func corsMiddleware(next http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {

		w.Header().Set("Access-Control-Allow-Origin", "*")
		w.Header().Set("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE, OPTIONS")
		w.Header().Set("Access-Control-Allow-Headers", "Content-Type, Authorization")
		w.Header().Set("Access-Control-Max-Age", "86400")

		if r.Method == http.MethodOptions {
			w.WriteHeader(http.StatusNoContent)
			return
		}

		next.ServeHTTP(w, r)
	})
}