require 'workers/stack_bootstrap/chef_node_name_builder'

# Fetches info about stack servers from provider and then persist them in mongo.
class StackServersPersister
  include PutsAndFlush
  attr_reader :stack, :out

  def initialize(stack, out)
    @stack, @out = stack, out
    @project = mongo.project(stack.project)
    @deploy_env = @project.deploy_env(stack.deploy_env)
    @provider = stack.provider_instance
  end

  # returns: {  priority_as_integer => [Servers] }
  def persist
    puts_and_flush 'Start saving stack servers into CID database.'
    stack_servers_with_priority = {}

    @provider.stack_servers(stack).each do |provider_info|
      server = persist_stack_server(provider_info)
      priority = provider_info['tags']['cid:priority'].to_i
      stack_servers_with_priority[priority] ||= []
      stack_servers_with_priority[priority] << server
    end

    puts_and_flush "Stack servers have been saved."
    stack_servers_with_priority.each do |priority, servers|
      out.puts "Servers with priority '#{priority}': #{servers.map(&:id).join(", ")}"
    end
    out.flush
    stack_servers_with_priority
  end

  private

  # takes a hash, returns Server model
  def persist_stack_server(server_info)
    server_attrs = {
      '_id' => server_info['id'],
      'chef_node_name' => get_name_builder(server_info).build_node_name!(incrementers_values),
      'created_by' => stack.owner,
      'deploy_env' => @deploy_env.identifier,
      'key' => server_info['key_name'] || @provider.ssh_key,
      'project' => @project.id,
      'provider' => @stack.provider,
      'provider_account' => @stack.provider_account,
      'remote_user' => mongo.image(@deploy_env.image).remote_user,
      'private_ip' => server_info['private_ip'],
      'public_ip' => server_info['public_ip'],
      'run_list' => stack.run_list || [],
      'stack' => stack.name
    }

    server = ::Devops::Model::Server.new(server_attrs)
    mongo.server_insert(server)
    server
  end

  def get_name_builder(server_info)
    ChefNodeNameBuilder.new(
      provider_server_info: server_info,
      project_id: @project.id,
      env_id: @deploy_env.identifier,
      owner: stack.owner
    )
  end

  def incrementers_values
    @incrementers_values ||= {}
  end

  def mongo
    Devops::Db.connector
  end
end