package main

import (
	"context"
	"errors"
	"log"
	"net/http"
	"os"
	"os/signal"
	"syscall"
	"time"

	"havenllo/internal/api"
	"havenllo/internal/app"
	"havenllo/internal/database"
	"havenllo/web"
)

func main() {
	listenAddr := env("HAVENLLO_LISTEN_ADDR", ":8080")
	databasePath := env("HAVENLLO_DATABASE_PATH", "/data/havenllo.db")

	ctx := context.Background()
	db, err := database.Open(ctx, databasePath)
	if err != nil {
		log.Fatalf("database setup failed: %v", err)
	}
	defer db.Close()

	server := &http.Server{
		Addr:              listenAddr,
		Handler:           api.NewHandler(app.New(db), web.Files),
		ReadHeaderTimeout: 10 * time.Second,
	}
	go func() {
		log.Printf("Havenllo listening on %s", listenAddr)
		if err := server.ListenAndServe(); err != nil && !errors.Is(err, http.ErrServerClosed) {
			log.Fatalf("server failed: %v", err)
		}
	}()

	stop := make(chan os.Signal, 1)
	signal.Notify(stop, os.Interrupt, syscall.SIGTERM)
	<-stop
	shutdownCtx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
	defer cancel()
	if err := server.Shutdown(shutdownCtx); err != nil {
		log.Printf("graceful shutdown failed: %v", err)
	}
}

func env(key, fallback string) string {
	if value := os.Getenv(key); value != "" {
		return value
	}
	return fallback
}