// TODO: Add EUPL banner everywhere
package main

import (
	"embed"
	"flag"
	"fmt"
	"net/http"
	"os"
	"os/signal"
	"path"
	"sync"

	"git.mstar.dev/mstar/goutils/other"
	"github.com/rs/zerolog/log"
	"gopkg.in/natefinch/lumberjack.v2"
	"gorm.io/driver/postgres"
	"gorm.io/gorm"

	"git.mstar.dev/mstar/linstrom/config"
	"git.mstar.dev/mstar/linstrom/shared"
	storagenew "git.mstar.dev/mstar/linstrom/storage-new"
	"git.mstar.dev/mstar/linstrom/storage-new/dbgen"
	webdebug "git.mstar.dev/mstar/linstrom/web/debug"
	webpublic "git.mstar.dev/mstar/linstrom/web/public"
)

// TODO: Add frontend overwrite
// Serve frontend files from a given directory instead of embedded data

//go:embed frontend-reactive/dist/* frontend-reactive/dist/assets
var reactiveFS embed.FS

//go:embed frontend-noscript
var nojsFS embed.FS

//go:embed duck.webp
var defaultDuck string

//go:embed duck.webp
var duckFS embed.FS

func main() {
	_ = reactiveFS
	_ = nojsFS
	other.SetupFlags()
	flag.Parse()
	logfile := getLogFilePathOrNil()
	if logfile == nil {
		other.ConfigureLogging(nil)
		log.Warn().Msg("Can't write to target logfile, not creating one")
	} else {
		other.ConfigureLogging(&lumberjack.Logger{
			Filename:   *logfile,
			MaxSize:    500, // Megabytes
			MaxBackups: 3,
			MaxAge:     3, // Days
			Compress:   false,
		})
		log.Info().Str("logfile", *logfile).Msg("Logging to stderr and logfile")
	}
	if err := config.ReadAndWriteToGlobal(*shared.FlagConfigFile); err != nil {
		log.Fatal().
			Err(err).
			Str("config-file", *shared.FlagConfigFile).
			Msg("Failed to read config and couldn't write default")
	}
	log.Trace().Any("config", config.GlobalConfig).Msg("Full config")

	// Request to only check config
	if *shared.FlagConfigOnly {
		return
	}
	newServer()
}

func getLogFilePathOrNil() *string {
	logfile := *shared.FlagLogFile
	logPath := path.Dir(logfile)
	if shared.IsWritable(logPath) {
		return &logfile
	} else {
		return nil
	}
}

func newServer() {
	log.Info().Msg("Connecting to db")
	db, err := gorm.Open(
		postgres.Open(config.GlobalConfig.Storage.BuildPostgresDSN()),
		&gorm.Config{
			Logger: shared.NewGormLogger(log.Logger),
		},
	)
	if err != nil {
		log.Fatal().Err(err).Msg("Failed to start db")
	}
	dbgen.SetDefault(db)
	log.Info().Msg("Applying migrations")
	if err = storagenew.Migrate(db); err != nil {
		log.Fatal().Err(err).Msg("Failed to automigrate structure")
	}
	log.Info().Msg("Inserting self into db")
	if err = storagenew.InsertSelf(); err != nil {
		log.Fatal().Err(err).Msg("Failed to insert self properly")
	}
	log.Info().Msg("Inserting placeholder/unknown user")
	if err = storagenew.InsertUnknownActorPlaceholder(); err != nil {
		log.Fatal().Err(err).Msg("Failed to insert self properly")
	}
	debugShutdownChan := make(chan *sync.WaitGroup, 1)
	interuptChan := make(chan os.Signal, 1)
	signal.Notify(interuptChan, os.Interrupt)
	if *shared.FlagStartDebugServer {
		go func() {
			log.Info().Msg("Starting debug server")
			s := webdebug.New(*shared.FlagDebugPort)
			go func() {
				wg := <-debugShutdownChan
				if err := s.Stop(); err != nil {
					log.Fatal().Err(err).Msg("Failed to cleanly stop debug server")
				}
				log.Info().Msg("Debug server stopped")
				wg.Done()
			}()
			if err = s.Start(); err != nil && err != http.ErrServerClosed {
				log.Fatal().Err(err).Msg("Debug server failed")
			}
		}()
	}
	public := webpublic.New(
		fmt.Sprintf(":%v", config.GlobalConfig.General.PrivatePort),
		&defaultDuck,
		duckFS,
	)
	go func() {
		log.Info().Msg("Starting public server")
		if err = public.Start(); err != nil && err != http.ErrServerClosed {
			log.Fatal().Err(err).Msg("Failed to start public server")
		}
	}()
	<-interuptChan
	log.Info().Msg("Received interrupt, shutting down")
	wg := sync.WaitGroup{}
	wg.Add(1)
	debugShutdownChan <- &wg
	if err = public.Stop(); err != nil {
		log.Fatal().Err(err).Msg("Failed to stop public server")
	}
	log.Info().Msg("Public server stopped")
	wg.Wait()
}