// Command server runs the Super Auto Pets board game server: game API,
// WebSocket sync, and the built web frontend.
package main

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

	"github.com/greyson/super-auto-pets-board-game/internal/env"
	"github.com/greyson/super-auto-pets-board-game/internal/server"
	"github.com/greyson/super-auto-pets-board-game/internal/store"
)

// isTruthy reports whether an env value means "on".
func isTruthy(v string) bool {
	switch strings.ToLower(strings.TrimSpace(v)) {
	case "1", "true", "yes", "on":
		return true
	}
	return false
}

func main() {
	if err := env.Load(".env"); err != nil {
		slog.Error("failed to read .env", "err", err)
		os.Exit(1)
	}
	dataDir := env.Get("DATA_DIR", "data")
	port := env.Get("PORT", "8080")
	staticDir := env.Get("STATIC_DIR", "web/dist")
	debug := isTruthy(env.Get("DEBUG", ""))
	if debug {
		slog.Warn("DEBUG mode on: the buy-any-card panel is enabled")
	}

	st, err := store.Open(dataDir)
	if err != nil {
		slog.Error("failed to open store", "err", err)
		os.Exit(1)
	}
	defer st.Close()

	if _, err := os.Stat(staticDir); err != nil {
		slog.Warn("static dir missing; only the API will be served", "dir", staticDir)
		staticDir = ""
	}

	srv := &http.Server{
		Addr:    ":" + port,
		Handler: server.New(st, staticDir, debug).Handler(),
	}

	go func() {
		slog.Info("listening", "addr", "http://localhost:"+port, "dataDir", dataDir)
		if err := srv.ListenAndServe(); err != nil && !errors.Is(err, http.ErrServerClosed) {
			slog.Error("server failed", "err", err)
			os.Exit(1)
		}
	}()

	stop := make(chan os.Signal, 1)
	signal.Notify(stop, os.Interrupt, syscall.SIGTERM)
	<-stop
	slog.Info("shutting down")
	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()
	srv.Shutdown(ctx)
}