package cmd

import (
	"errors"
	"github.com/spf13/cobra"
	"huffman/internal/huffman"
	"os"
)

var decodeCmd = &cobra.Command{
	Use:   "decode <archive name> <file name>",
	Short: "Decodes the file",
	Args: func(cmd *cobra.Command, args []string) error {
		if len(args) < 2 {
			return errors.New("filename is required")
		}

		if _, err := os.Stat(args[0]); os.IsNotExist(err) {
			return errors.New("archive file is not exists")
		} else if err != nil {
			panic(err)
		}

		if _, err := os.Stat(args[1]); err == nil {
			return errors.New("output file exists")
		} else if !os.IsNotExist(err) {
			panic(err)
		}

		return nil
	},
	Run: func(cmd *cobra.Command, args []string) {
		fromFile, err := os.Open(args[0])
		if err != nil {
			panic(err)
		}

		toFile, err := os.Create(args[1])

		huffman.Decode(fromFile, toFile)
	},
}

func init() {
	rootCmd.AddCommand(decodeCmd)
}