package main

import (
	"context"
	"errors"
	"flag"
	"fmt"
	"log/slog"
	"net/http"
	"os"
	"os/signal"
	"syscall"
	"time"
	// Embed the timezone database so eBay's Pacific-time quota reset resolves
	// correctly even on minimal hosts without system zoneinfo.
	_ "time/tzdata"

	"veola/internal/apify"
	"veola/internal/auth"
	"veola/internal/config"
	"veola/internal/crypto"
	"veola/internal/db"
	"veola/internal/handlers"
	"veola/internal/ntfy"
	"veola/internal/scheduler"
)

func main() {
	configPath := flag.String("config", "config.toml", "path to config TOML file")
	debug := flag.Bool("debug", false, "enable debug-level logging (verbose; raw external payloads logged)")
	flag.Parse()

	level := slog.LevelInfo
	if *debug {
		level = slog.LevelDebug
	}
	slog.SetDefault(slog.New(slog.NewTextHandler(os.Stderr, &slog.HandlerOptions{Level: level})))

	if *debug {
		slog.Debug("debug logging enabled")
	}

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

func run(configPath string) error {
	cfg, err := config.Load(configPath)
	if err != nil {
		return fmt.Errorf("config: %w", err)
	}

	key, err := crypto.DeriveKey([]byte(cfg.Security.EncryptionKey))
	if err != nil {
		return fmt.Errorf("derive key: %w", err)
	}

	sqlDB, err := db.Open(cfg.Server.DBPath)
	if err != nil {
		return fmt.Errorf("db open: %w", err)
	}
	defer sqlDB.Close()

	store := db.NewStore(sqlDB, key)
	authMgr, err := auth.NewManager(sqlDB, store, cfg.Security.SessionSecret, cfg.Server.UseSecureCookies())
	if err != nil {
		return fmt.Errorf("auth manager: %w", err)
	}

	apifyClient := apify.New(cfg.Apify.APIKey)
	ntfyClient := ntfy.New(cfg.Ntfy.BaseURL)
	sched := scheduler.New(cfg, store, apifyClient, ntfyClient)

	startCtx, cancelStart := context.WithTimeout(context.Background(), 30*time.Second)
	defer cancelStart()
	if err := sched.Start(startCtx); err != nil {
		return fmt.Errorf("scheduler start: %w", err)
	}

	app := handlers.New(cfg, store, authMgr, apifyClient, ntfyClient, sched)
	addr := fmt.Sprintf(":%d", cfg.Server.Port)
	srv := &http.Server{
		Addr:              addr,
		Handler:           app.Routes(),
		ReadHeaderTimeout: 10 * time.Second,
		ReadTimeout:       30 * time.Second,
		WriteTimeout:      60 * time.Second,
		IdleTimeout:       120 * time.Second,
	}

	errCh := make(chan error, 1)
	go func() {
		slog.Info("listening", "addr", addr)
		if err := srv.ListenAndServe(); err != nil && !errors.Is(err, http.ErrServerClosed) {
			errCh <- err
		}
		close(errCh)
	}()

	sigCh := make(chan os.Signal, 1)
	signal.Notify(sigCh, syscall.SIGINT, syscall.SIGTERM)

	select {
	case sig := <-sigCh:
		slog.Info("shutting down", "signal", sig.String())
	case err := <-errCh:
		if err != nil {
			return fmt.Errorf("http: %w", err)
		}
	}

	shutdownCtx, cancelShutdown := context.WithTimeout(context.Background(), 30*time.Second)
	defer cancelShutdown()
	if err := srv.Shutdown(shutdownCtx); err != nil {
		slog.Error("http shutdown", "err", err)
	}
	sched.Stop()
	slog.Info("shutdown complete")
	return nil
}