package main

import (
	"context"
	"fmt"
	"io/fs"
	"log"
	"net/http"
	"os/signal"
	"syscall"
	"time"

	hwlab "git.georgsen.dk/hwlab"
	"git.georgsen.dk/hwlab/internal/api"
	"git.georgsen.dk/hwlab/internal/config"
	"git.georgsen.dk/hwlab/internal/queue"
)

func main() {
	cfg, err := config.Load()
	if err != nil {
		log.Fatalf("config: %v", err)
	}

	staticFS, err := fs.Sub(hwlab.StaticFiles, "web/dist")
	if err != nil {
		log.Fatalf("embed: %v", err)
	}

	// Context for graceful shutdown
	ctx, stop := signal.NotifyContext(context.Background(), syscall.SIGINT, syscall.SIGTERM)
	defer stop()

	// Start write-ahead queue worker (non-fatal if DragonFlyDB unavailable)
	waq, err := queue.NewWAQ(cfg.DragonflyURL)
	if err != nil {
		log.Printf("WARNING: WAQ unavailable (%v) — NetBox operations will not be queued during downtime", err)
	} else {
		retryInterval := time.Duration(cfg.WAQRetryIntervalSeconds) * time.Second
		go waq.RunWorker(ctx, queue.NoOpHandler, cfg.WAQMaxAttempts, retryInterval)
		defer waq.Close()
		log.Printf("WAQ worker started")
	}

	router := api.NewRouter(staticFS)
	addr := fmt.Sprintf("%s:%d", cfg.Host, cfg.Port)
	log.Printf("HWLab starting on %s", addr)

	srv := &http.Server{Addr: addr, Handler: router}
	go func() {
		if err := srv.ListenAndServe(); err != nil && err != http.ErrServerClosed {
			log.Fatalf("server: %v", err)
		}
	}()

	// Wait for shutdown signal
	<-ctx.Done()
	log.Println("Shutting down...")
	shutdownCtx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
	defer cancel()
	if err := srv.Shutdown(shutdownCtx); err != nil {
		log.Printf("server shutdown: %v", err)
	}
	log.Println("Shutdown complete")
}