package main

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

	"dockermanager/backend/internal/config"
	dockerconn "dockermanager/backend/internal/docker"
	"dockermanager/backend/internal/httpserver"
)

func main() {
	logger := slog.New(slog.NewJSONHandler(os.Stdout, nil))

	if err := run(logger); err != nil {
		logger.Error("fatal error", "err", err)
		os.Exit(1)
	}
}

func run(logger *slog.Logger) error {
	cfg, err := config.Load()
	if err != nil {
		return fmt.Errorf("loading config: %w", err)
	}

	dockerCli, err := dockerconn.NewLocalConnector(cfg.DockerHost)
	if err != nil {
		return fmt.Errorf("connecting to docker: %w", err)
	}
	defer dockerCli.Close()

	router := httpserver.NewRouter(httpserver.Deps{
		Logger:  logger,
		Docker:  dockerCli,
		Origins: cfg.CORSAllowedOrigins,
	})

	srv := &http.Server{
		Addr:              fmt.Sprintf(":%d", cfg.Port),
		Handler:           router,
		ReadHeaderTimeout: 5 * time.Second,
	}

	ctx, stop := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM)
	defer stop()

	go func() {
		logger.Info("server listening", "port", cfg.Port, "env", cfg.Env)
		if err := srv.ListenAndServe(); err != nil && !errors.Is(err, http.ErrServerClosed) {
			logger.Error("server error", "err", err)
		}
	}()

	<-ctx.Done()
	logger.Info("shutting down")

	shutdownCtx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
	defer cancel()
	return srv.Shutdown(shutdownCtx)
}