package main

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

	// Embeds the timezone database in the binary so the local day rolls over
	// correctly inside a scratch image, which has no /usr/share/zoneinfo.
	_ "time/tzdata"

	"github.com/scottyah/tracker/internal/config"
	"github.com/scottyah/tracker/internal/store"
	"github.com/scottyah/tracker/internal/web"
)

func main() {
	slog.SetDefault(slog.New(slog.NewTextHandler(os.Stdout, nil)))

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

func run() error {
	cfg, err := config.Load()
	if err != nil {
		return err
	}

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

	st, err := store.Open(cfg.DataPath)
	if err != nil {
		return err
	}
	slog.Info("data ready", "path", cfg.DataPath, "tz", cfg.TZ.String())

	srv, err := web.New(cfg, st)
	if err != nil {
		return err
	}

	httpServer := &http.Server{
		Addr:              cfg.Addr,
		Handler:           srv,
		ReadHeaderTimeout: 10 * time.Second,
		ReadTimeout:       30 * time.Second,
		WriteTimeout:      60 * time.Second,
		IdleTimeout:       90 * time.Second,
	}

	go func() {
		<-ctx.Done()
		slog.Info("shutting down")
		shutdownCtx, cancel := context.WithTimeout(context.Background(), 15*time.Second)
		defer cancel()
		if err := httpServer.Shutdown(shutdownCtx); err != nil {
			slog.Error("shutdown", "err", err)
		}
	}()

	slog.Info("listening", "addr", cfg.Addr, "base_url", cfg.BaseURL)
	if err := httpServer.ListenAndServe(); err != nil &&
		!errors.Is(err, http.ErrServerClosed) {
		return err
	}
	return nil
}