/*
Copyright © 2023 Seednode <seednode@seedno.de>
*/

package cmd

import (
	"errors"
	"log"
	"time"

	"github.com/spf13/cobra"
)

var (
	ErrIncorrectRefreshInterval = errors.New("refresh interval must be a duration string >= 500ms")
)

const (
	Version string = "0.58.0"
)

var (
	bind             string
	cache            bool
	cacheFile        string
	debug            bool
	filtering        bool
	maximumFileCount uint32
	minimumFileCount uint32
	pageLength       uint16
	port             uint16
	profile          bool
	recursive        bool
	refreshInterval  string
	sorting          bool
	statistics       bool
	statisticsFile   string
	verbose          bool
	version          bool

	rootCmd = &cobra.Command{
		Use:   "roulette <path> [path]...",
		Short: "Serves random images from the specified directories.",
		Args:  cobra.MinimumNArgs(1),
		PreRun: func(cmd *cobra.Command, args []string) {
			if debug {
				cmd.MarkFlagRequired("cache")
			}

			if refreshInterval != "" {
				interval, err := time.ParseDuration(refreshInterval)
				if err != nil || interval < 500*time.Millisecond {
					log.Fatal(ErrIncorrectRefreshInterval)
				}
			}
		},
		RunE: func(cmd *cobra.Command, args []string) error {
			err := ServePage(args)
			if err != nil {
				return err
			}

			return nil
		},
	}
)

func Execute() {
	err := rootCmd.Execute()
	if err != nil {
		log.Fatal(err)
	}
}

func init() {
	rootCmd.Flags().StringVarP(&bind, "bind", "b", "0.0.0.0", "address to bind to")
	rootCmd.Flags().BoolVarP(&cache, "cache", "c", false, "generate directory cache at startup")
	rootCmd.Flags().StringVar(&cacheFile, "cache-file", "", "path to optional persistent cache file")
	rootCmd.Flags().BoolVarP(&debug, "debug", "d", false, "expose debug endpoint")
	rootCmd.Flags().BoolVarP(&filtering, "filter", "f", false, "enable filtering")
	rootCmd.Flags().Uint32Var(&maximumFileCount, "maximum-files", 1<<32-1, "skip directories with file counts over this value")
	rootCmd.Flags().Uint32Var(&minimumFileCount, "minimum-files", 0, "skip directories with file counts under this value")
	rootCmd.Flags().Uint16Var(&pageLength, "page-length", 0, "pagination length for stats page")
	rootCmd.Flags().Uint16VarP(&port, "port", "p", 8080, "port to listen on")
	rootCmd.Flags().BoolVar(&profile, "profile", false, "register net/http/pprof handlers")
	rootCmd.Flags().BoolVarP(&recursive, "recursive", "r", false, "recurse into subdirectories")
	rootCmd.Flags().StringVar(&refreshInterval, "refresh-interval", "", "force refresh interval equal to this duration (minimum 500ms)")
	rootCmd.Flags().BoolVarP(&sorting, "sort", "s", false, "enable sorting")
	rootCmd.Flags().BoolVar(&statistics, "stats", false, "expose stats endpoint")
	rootCmd.Flags().StringVar(&statisticsFile, "stats-file", "", "path to optional persistent stats file")
	rootCmd.Flags().BoolVarP(&verbose, "verbose", "v", false, "log accessed files to stdout")
	rootCmd.Flags().BoolVarP(&version, "version", "V", false, "display version and exit")
	rootCmd.Flags().SetInterspersed(true)

	rootCmd.CompletionOptions.HiddenDefaultCmd = true

	rootCmd.SilenceErrors = true
	rootCmd.SetHelpCommand(&cobra.Command{
		Hidden: true,
	})

	rootCmd.SetVersionTemplate("roulette v{{.Version}}\n")
	rootCmd.Version = Version
}