module Eye::Cli::Render
private
  def render_status(data)
    return [1, "unexpected server response #{data.inspect}"] unless data.is_a?(Hash)
    data = data[:subtree]
    return [1, "match #{data.size} objects (#{data.map{|d| d[:name]}}), but expected only 1 process"] if data.size != 1
    process = data[0]
    return [1, "unknown status for :#{process[:type]}=#{process[:name]}"] unless process[:type] == :process

    state = process[:state].to_sym
    return [0, ''] if state == :up
    return [3, ''] if state == :unmonitored

    [4, "process #{process[:name]} state :#{state}"]
  end

  def render_info(data)
    error!("unexpected server response #{data.inspect}") unless data.is_a?(Hash)

    make_str data
  end

  def make_str(data, level = -1)
    return nil if !data || data.empty?

    if data.is_a?(Array)
      data.map{|el| make_str(el, level) }.compact * "\n"
    else
      str = nil

      if data[:name]
        return make_str(data[:subtree], level) if data[:name] == '__default__'

        off = level * 2
        off_str = ' ' * off

        short_state = ((data[:type] == :application || data[:type] == :group) && data[:states])
        is_text = data[:state] || data[:states]

        name = (data[:type] == :application && !is_text) ? "\033[1m#{data[:name]}\033[0m" : data[:name].to_s
        off_len = 35
        str = off_str + (name + ' ').ljust(off_len - off, is_text ? '.' : ' ')

        if short_state
          str += ' ' + data[:states].map { |k, v| "#{k}:#{v}" }.join(', ')
        elsif data[:state]
          str += ' ' + data[:state].to_s
          str += '  (' + resources_str(data[:resources]) + ')' if data[:resources] && data[:state].to_sym == :up
          str += " (#{data[:state_reason]} at #{Eye::Utils.human_time2(data[:state_changed_at])})" if data[:state_reason] && data[:state] == 'unmonitored'
        elsif data[:current_command]
          chain_progress = if data[:chain_progress]
            " #{data[:chain_progress][0]} of #{data[:chain_progress][1]}" rescue ''
          end
          str += " \e[1;33m[#{data[:current_command]}#{chain_progress}]\033[0m"
          str += " (#{data[:chain_commands] * ', '})" if data[:chain_commands]
        end

      end

      if data[:subtree].nil?
        str
      elsif !data[:subtree] && data[:type] != :application
        nil
      else
        [str, make_str(data[:subtree], level + 1)].compact * "\n"
      end
    end
  end

  def resources_str(r)
    return '' if !r || r.empty?
    memory, cpu, start_time, pid = r[:memory], r[:cpu], r[:start_time], r[:pid]
    return '' unless memory && cpu && start_time

    "#{Eye::Utils.human_time(start_time)}, #{cpu.to_i}%, #{memory / 1024 / 1024}Mb, <#{pid}>"
  end

  def render_debug_info(data)
    error!("unexpected server response #{data.inspect}") unless data.is_a?(Hash)

    s = ""

    if config_yaml = data.delete(:config_yaml)
      s << config_yaml

    else
      data.each do |k, v|
        s << "#{"#{k}:".ljust(10)} "

        case k
        when :resources
          s << resources_str(v)
        else
          s << "#{v}"
        end

        s << "\n"
      end

      s << "\n"
    end

    s
  end

  def render_history(data)
    error!("unexpected server response #{data.inspect}") unless data.is_a?(Hash)
    data.map { |name, history| detail_process_info(name, history) }.join("\n")
  end

  def detail_process_info(name, history)
    return if history.empty?

    res = "\033[1m#{name}\033[0m\n"
    history = history.reverse

    history.chunk{|h| [h[:state], h[:reason].to_s] }.each do |_, hist|
      if hist.size >= 3
        res << detail_process_info_string(hist[0])
        res << detail_process_info_string(:state => "... #{hist.size - 2} times", :reason => '...')
        res << detail_process_info_string(hist[-1])
      else
        hist.each do |h|
          res << detail_process_info_string(h)
        end
      end
    end

    res
  end

  def detail_process_info_string(h)
    state = h[:state].to_s.ljust(14)
    at = h[:at] ? Eye::Utils.human_time2(h[:at]) : '.' * 12
    "#{at} - #{state} (#{h[:reason]})\n"
  end

end