require 'clamp'

require 'siren'

module Siren
module CLI

  class SongfileCommand < Clamp::Command

    subcommand %w(c conv convert), "Convert songfile to resources" do
      parameter "SONGFILE", "the Songfile"
      def execute
        song = Siren::Song.load(songfile)
        puts song.to_stack.to_yaml
      end
    end

  end

  class CryptoCommand < Clamp::Command

    subcommand %w(g gen genkeys), "Generate encryption keys" do
      option %w(-f --force), :flag, "overwrite keys if they already exist"
      option %w(-k --privkey), "FILE", "private key file", default: "private.jwk"
      option %w(-p --pubkey), "FILE", "public key file", default: "public.jwk"
      def execute
        if File.exists?(privkey) && !force?
          STDERR.puts "Won't overwrite #{privkey}. Delete it first if you want to generate a new key."
          exit 1
        end
        private, public = Siren::Crypto.genkeys
        public.to_file(privkey)
        private.to_file(pubkey)
        puts "Keys generated. Keep #{privkey} secret. Give #{pubkey} to whoever needs it."
        puts "Thumbprint: #{JOSE::JWK.thumbprint(private)}"
      end
    end

    subcommand %w(e enc encrypt), "Encrypt data using public key" do
      option %w(-k --pubkey), "FILE", "public key file", default: "public.jwk"
      parameter "WORDS ...", "the data to encrypt", attribute_name: :words
      def execute
        require "jose"
        key = JOSE::JWK.from_file(pubkey)
        STDERR.puts "multiple arguments will be joined with single spaces" if words.length > 1
        plain = words.join(" ")
        cyphertext = key.box_encrypt(plain)[0].compact
        puts cyphertext
      end
    end

    subcommand %w(d dec decrypt), "Decrypt data using private key" do
      option %w(-k --privkey), "FILE", "private key file", default: "private.jwk"
      parameter "CYPHERTEXT", "the data to decrypt", attribute_name: :cyphertext
      def execute
        require "jose"
        key = JOSE::JWK.from_file(privkey)
        puts key.block_decrypt(cyphertext)[0]
      end
    end

  end

  class SirenCommand < Clamp::Command

    subcommand %w(ver version), "Show version" do
      def execute
        puts "siren #{Siren::VERSION}"
        exit(0)
      end
    end

    subcommand %w(c crypto cryptography), "Cryptography (JOSE) commands", CryptoCommand
    subcommand %w(s song songs songfile), "Songfile commands", SongfileCommand

  end

  def self.start
    SirenCommand.run
  end

end
end