package main

import (
	"context"
	"errors"
	"log/slog"
	"net/http"
	"os"
	"os/signal"
	"path/filepath"
	"syscall"
	"time"
	_ "time/tzdata"

	"pocketwatch-go/internal/app"
)

func main() {
	logger := slog.New(slog.NewJSONHandler(os.Stdout, &slog.HandlerOptions{Level: slog.LevelInfo}))
	addr := env("APP_ADDR", ":8080")
	dataDir := env("DATA_DIR", "/data")
	if err := os.MkdirAll(dataDir, 0o750); err != nil {
		logger.Error("create data directory", "error", err)
		os.Exit(1)
	}

	cfg := app.Config{
		DBPath:       filepath.Join(dataDir, "pocketwatch.db"),
		CookieSecure: env("COOKIE_SECURE", "false") == "true",
		SessionTTL:   30 * 24 * time.Hour,
	}

	a, err := app.New(cfg, logger)
	if err != nil {
		logger.Error("initialize app", "error", err)
		os.Exit(1)
	}
	defer a.Close()

	srv := &http.Server{
		Addr:              addr,
		Handler:           a.Handler(),
		ReadHeaderTimeout: 10 * time.Second,
		ReadTimeout:       20 * time.Second,
		WriteTimeout:      60 * time.Second,
		IdleTimeout:       120 * time.Second,
		MaxHeaderBytes:    1 << 20,
	}

	go func() {
		logger.Info("pocketwatch listening", "addr", addr, "db", cfg.DBPath)
		if err := srv.ListenAndServe(); err != nil && !errors.Is(err, http.ErrServerClosed) {
			logger.Error("http server", "error", err)
			os.Exit(1)
		}
	}()

	stop := make(chan os.Signal, 1)
	signal.Notify(stop, os.Interrupt, syscall.SIGTERM)
	<-stop

	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
	defer cancel()
	if err := srv.Shutdown(ctx); err != nil {
		logger.Error("graceful shutdown", "error", err)
	}
}

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