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

package cmd

import (
	"log"
	"math"
	"regexp"

	"github.com/spf13/cobra"
)

const (
	AllowedCharacters string = `^[A-z0-9.\-_]+$`
	ReleaseVersion    string = "3.6.0"
)

var (
	AdminPrefix    string
	All            bool
	Audio          bool
	Bind           string
	CaseSensitive  bool
	Code           bool
	CodeTheme      string
	Concurrency    int
	DisableButtons bool
	ExitOnError    bool
	Fallback       bool
	Filtering      bool
	Flash          bool
	Fun            bool
	Handlers       bool
	Ignore         bool
	IgnoreFile     string
	Images         bool
	Index          bool
	IndexFile      string
	Info           bool
	MaxFileCount   int
	MinFileCount   int
	PageLength     int
	Port           int
	Prefix         string
	Profile        bool
	Recursive      bool
	Refresh        bool
	Russian        bool
	Sorting        bool
	Text           bool
	Verbose        bool
	Version        bool
	Videos         bool

	RequiredArgs = []string{
		"all",
		"audio",
		"code",
		"fallback",
		"flash",
		"images",
		"text",
		"video",
	}

	rootCmd = &cobra.Command{
		Use:   "roulette <path> [path]...",
		Short: "Serves random media from the specified directories.",
		Args:  cobra.MinimumNArgs(1),
		PreRunE: func(cmd *cobra.Command, args []string) error {
			switch {
			case MaxFileCount < 0 || MinFileCount < 0 || MaxFileCount > math.MaxInt32 || MinFileCount > math.MaxInt32:
				return ErrInvalidFileCountValue
			case MinFileCount > MaxFileCount:
				return ErrInvalidFileCountRange
			case Port < 1 || Port > 65535:
				return ErrInvalidPort
			case Concurrency < 1 || Concurrency > 8192:
				return ErrInvalidConcurrency
			case Ignore && !regexp.MustCompile(AllowedCharacters).MatchString(IgnoreFile):
				return ErrInvalidIgnoreFile
			case AdminPrefix != "" && !regexp.MustCompile(AllowedCharacters).MatchString(AdminPrefix):
				return ErrInvalidAdminPrefix
			case AdminPrefix != "":
				AdminPrefix = "/" + AdminPrefix
			}

			return nil
		},
		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().StringVar(&AdminPrefix, "admin-prefix", "", "string to prepend to administrative paths")
	rootCmd.Flags().BoolVarP(&All, "all", "a", false, "enable all supported file types")
	rootCmd.Flags().BoolVar(&Audio, "audio", false, "enable support for audio files")
	rootCmd.Flags().StringVarP(&Bind, "bind", "b", "0.0.0.0", "address to bind to")
	rootCmd.Flags().BoolVar(&CaseSensitive, "case-sensitive", false, "use case-sensitive matching for filters")
	rootCmd.Flags().BoolVar(&Code, "code", false, "enable support for source code files")
	rootCmd.Flags().StringVar(&CodeTheme, "code-theme", "solarized-dark256", "theme for source code syntax highlighting")
	rootCmd.Flags().IntVar(&Concurrency, "concurrency", 8192, "maximum concurrency for scan threads")
	rootCmd.Flags().BoolVar(&DisableButtons, "disable-buttons", false, "disable first/prev/next/last buttons")
	rootCmd.Flags().BoolVar(&ExitOnError, "exit-on-error", false, "shut down webserver on error, instead of just printing the error")
	rootCmd.Flags().BoolVar(&Fallback, "fallback", false, "serve files as application/octet-stream if no matching format is registered")
	rootCmd.Flags().BoolVarP(&Filtering, "filter", "f", false, "enable filtering")
	rootCmd.Flags().BoolVar(&Flash, "flash", false, "enable support for shockwave flash files (via ruffle.rs)")
	rootCmd.Flags().BoolVar(&Fun, "fun", false, "add a bit of excitement to your day")
	rootCmd.Flags().BoolVar(&Handlers, "handlers", false, "display registered handlers (for debugging)")
	rootCmd.Flags().BoolVar(&Ignore, "ignore", false, "skip all directories containing a specified filename")
	rootCmd.Flags().StringVar(&IgnoreFile, "ignore-file", ".roulette-ignore", "filename used to indicate directory to be skipped")
	rootCmd.Flags().BoolVar(&Images, "images", false, "enable support for image files")
	rootCmd.Flags().BoolVar(&Index, "index", false, "generate index of supported file paths at startup")
	rootCmd.Flags().StringVar(&IndexFile, "index-file", "", "path to optional persistent index file")
	rootCmd.Flags().BoolVarP(&Info, "info", "i", false, "expose informational endpoints")
	rootCmd.Flags().IntVar(&MaxFileCount, "max-file-count", math.MaxInt32, "skip directories with file counts above this value")
	rootCmd.Flags().IntVar(&MinFileCount, "min-file-count", 0, "skip directories with file counts below this value")
	rootCmd.Flags().IntVar(&PageLength, "page-length", 0, "pagination length for info pages")
	rootCmd.Flags().IntVarP(&Port, "port", "p", 8080, "port to listen on")
	rootCmd.Flags().StringVar(&Prefix, "prefix", "/", "root path for http handlers (for reverse proxying)")
	rootCmd.Flags().BoolVar(&Profile, "profile", false, "register net/http/pprof handlers")
	rootCmd.Flags().BoolVarP(&Recursive, "recursive", "r", false, "recurse into subdirectories")
	rootCmd.Flags().BoolVar(&Refresh, "refresh", false, "enable automatic page refresh via query parameter")
	rootCmd.Flags().BoolVar(&Russian, "russian", false, "remove selected images after serving")
	rootCmd.Flags().BoolVarP(&Sorting, "sort", "s", false, "enable sorting")
	rootCmd.Flags().BoolVar(&Text, "text", false, "enable support for text files")
	rootCmd.Flags().BoolVarP(&Verbose, "verbose", "v", false, "log accessed files and other information to stdout")
	rootCmd.Flags().BoolVarP(&Version, "version", "V", false, "display version and exit")
	rootCmd.Flags().BoolVar(&Videos, "video", false, "enable support for video files")

	rootCmd.CompletionOptions.HiddenDefaultCmd = true

	rootCmd.Flags().SetInterspersed(true)

	rootCmd.MarkFlagsOneRequired(RequiredArgs...)

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

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

	rootCmd.SilenceErrors = true

	rootCmd.Version = ReleaseVersion
}