module FuckingShellScripts
  class SCP
    FILENAME = "fss.tar.gz"

    def initialize(server, opts)
      @server, @opts = server, opts
    end

    def to_server
      check_executable_permissions
      create_local_archive
      scp_files_to_server
      extract_remote_archive
      remove_remote_archive
      remove_local_archive
    end

    private

    def check_executable_permissions
      @opts.fetch(:scripts).each do |file|
        raise FuckingShellScripts::Errors::ScriptNotExecutable , "The script #{file} is not executable." unless File.executable?(file)
      end
    end
    
    def create_local_archive
      includes = @opts.fetch(:files){ [] } + @opts.fetch(:scripts)
      `tar -czf #{FILENAME} #{includes.join(" ")}`
    end

    def scp_files_to_server
      @server.scp(FILENAME, ".")
    end

    def extract_remote_archive
      @server.ssh("tar -xzf #{FILENAME}")
    end

    def remove_remote_archive
      @server.ssh("rm #{FILENAME}")
    end

    def remove_local_archive
      `rm -f #{FILENAME}`
    end
  end
end