/*
Copyright © 2024 Evan Fiordeliso <evan.fiordeliso@gmail.com>
*/
package cmd

import (
	"errors"
	"fmt"
	"log/slog"
	"os"

	"github.com/dgraph-io/badger/v2"
	"github.com/spf13/cobra"
	"github.com/spf13/viper"
	"go.fifitido.net/ytdl-web/config"
	"go.fifitido.net/ytdl-web/pkg/server"
	"go.fifitido.net/ytdl-web/pkg/utils"
	"go.fifitido.net/ytdl-web/pkg/ytdl"
	"go.fifitido.net/ytdl-web/pkg/ytdl/cache"
)

var (
	cfgFile string
	cfg     *config.Config

	rootCmd = &cobra.Command{
		Use:   "ytdl-web",
		Short: "A web frontend for yt-dlp",
		Long: `YTDL Web is a web application that grabs the links to videos
from over a thousand websites using the yt-dlp project under the hood.`,
		RunE: func(cmd *cobra.Command, args []string) error {
			initLogging()
			logger := slog.Default()

			db, err := badger.Open(
				badger.
					DefaultOptions(cfg.Cache.DirPath).
					WithLogger(utils.NewBadgerLogger(logger.With("module", "badger"))),
			)
			if err != nil {
				return err
			}
			defer db.Close()

			cache := cache.NewDefaultMetadataCache(db)
			yt := ytdl.NewYtdl(cfg, slog.Default(), cache)
			ytdl.SetDefault(yt)

			return server.ListenAndServe(
				server.WithListenAddr(viper.GetString("http.listen")),
				server.WithListenPort(viper.GetInt("http.port")),
				server.WithLogger(logger.With("module", "server")),
			)
		},
	}
)

func Execute() error {
	return rootCmd.Execute()
}

func init() {
	cobra.OnInitialize(initConfig)

	rootCmd.PersistentFlags().StringVar(&cfgFile, "config", "", "config file (default is $XDG_CONFIG_HOME/ytdl-web/config.yml)")

	rootCmd.PersistentFlags().IntP("port", "p", 8080, "port to listen on")
	rootCmd.PersistentFlags().StringP("listen", "l", "", "address to listen on")
	rootCmd.PersistentFlags().StringP("base-path", "b", "", "the base path, used when behind reverse proxy")
	rootCmd.PersistentFlags().StringP("ytdlp-path", "y", "", "the path to the yt-dlp binary, used when it is not in $PATH")
	rootCmd.PersistentFlags().BoolP("cookies-enabled", "C", false, "whether cookies are enabled")
	rootCmd.PersistentFlags().StringP("cookies", "c", "", "the path to the cookies file")

	viper.BindPFlag("http.port", rootCmd.PersistentFlags().Lookup("port"))
	viper.BindPFlag("http.listen", rootCmd.PersistentFlags().Lookup("listen"))
	viper.BindPFlag("http.basePath", rootCmd.PersistentFlags().Lookup("base-path"))
	viper.BindPFlag("ytdlp.binaryPath", rootCmd.PersistentFlags().Lookup("ytdlp-path"))
	viper.BindPFlag("cookies.enabled", rootCmd.PersistentFlags().Lookup("cookies-enabled"))
	viper.BindPFlag("cookies.filePath", rootCmd.PersistentFlags().Lookup("cookies"))
}

func initConfig() {
	var err error
	if cfgFile != "" {
		cfg, err = config.LoadConfig(cfgFile)
	} else {
		cfg, err = config.LoadConfig()
	}

	notFound := &viper.ConfigFileNotFoundError{}
	switch {
	case err != nil && !errors.As(err, notFound):
		cobra.CheckErr(err)
	case err != nil && errors.As(err, notFound):
		// The config file is optional, we shouldn't exit when the config is not found
		break
	default:
		fmt.Fprintln(os.Stderr, "Using config file:", viper.ConfigFileUsed())
	}
}

func initLogging() {
	if cfg.IsProduction() {
		slog.SetDefault(slog.New(slog.NewJSONHandler(os.Stdout, &slog.HandlerOptions{
			AddSource: true,
			Level:     slog.LevelInfo,
		})))
	} else {
		slog.SetDefault(slog.New(slog.NewTextHandler(os.Stdout, &slog.HandlerOptions{
			AddSource: true,
			Level:     slog.LevelDebug,
		})))
	}
}