package main

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

	"data-terminal-cloud/internal/mockalertreceiver"
)

func main() {
	logger := slog.New(slog.NewJSONHandler(os.Stdout, nil)).With("service", "mock-alert-receiver")
	receiver, err := mockalertreceiver.New(mockalertreceiver.Options{
		Secret: env("ALERT_WEBHOOK_SECRET", "local-alert-webhook-secret-32-bytes-minimum"), ClockSkew: 5 * time.Minute,
	}, logger)
	if err != nil {
		logger.Error("configure mock alert receiver", "error", err)
		os.Exit(1)
	}
	server := &http.Server{Addr: env("HTTP_ADDR", "0.0.0.0:8084"), Handler: receiver.Handler(), ReadHeaderTimeout: 5 * time.Second}
	ctx, stop := signal.NotifyContext(context.Background(), syscall.SIGINT, syscall.SIGTERM)
	defer stop()
	go func() {
		<-ctx.Done()
		shutdown, cancel := context.WithTimeout(context.Background(), 5*time.Second)
		defer cancel()
		_ = server.Shutdown(shutdown)
	}()
	logger.Info("mock alert receiver started", "address", server.Addr)
	if err = server.ListenAndServe(); err != nil && err != http.ErrServerClosed {
		logger.Error("mock alert receiver stopped unexpectedly", "error", err)
		os.Exit(1)
	}
}

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