package main

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

	"github.com/bams/backend/internal/api"
	"github.com/bams/backend/internal/config"
	"github.com/bams/backend/internal/logger"
	"github.com/bams/backend/internal/services"
)

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

	// Initialize logger
	logger := logger.New(cfg.LogLevel)

	// Initialize services
	svcManager := services.NewServiceManager(cfg, logger)

	// Initialize API router
	router := api.NewRouter(svcManager, logger)

	// Create HTTP server
	srv := &http.Server{
		Addr:         fmt.Sprintf(":%d", cfg.Port),
		Handler:      router,
		ReadTimeout:  15 * time.Second,
		WriteTimeout: 15 * time.Second,
		IdleTimeout:  60 * time.Second,
	}

	// Start server in goroutine
	go func() {
		logger.Info("Starting BAMS backend server", "port", cfg.Port)
		if err := srv.ListenAndServe(); err != nil && err != http.ErrServerClosed {
			logger.Error("Server failed to start", "error", err)
			os.Exit(1)
		}
	}()

	// Graceful shutdown
	quit := make(chan os.Signal, 1)
	signal.Notify(quit, syscall.SIGINT, syscall.SIGTERM)
	<-quit

	logger.Info("Shutting down server...")
	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
	defer cancel()

	if err := srv.Shutdown(ctx); err != nil {
		logger.Error("Server forced to shutdown", "error", err)
	}

	svcManager.Shutdown()
	logger.Info("Server exited")
}