require 'workers/stack_bootstrap/chef_node_name_builder'

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 syncing stack servers with CID'

    stack_servers_with_priority = {}
    stack_servers_info.each do |priority, info_array|
      stack_servers_with_priority[priority] = info_array.map do |info_hash|
        out.puts "Instance '#{info_hash["id"]}' has been launched with stack."
        persist_stack_server(info_hash)
      end
    end
    puts_and_flush "Stack servers have been synced with CID"
    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

  # returns: {priority_as_integer => array_of_sersvers_info}
  def stack_servers_info
    stack_servers = @provider.stack_servers(stack)
    stack_servers.each do |info|
      info['tags']['cid:priority'] = info['tags']['cid:priority'].to_i
    end
    stack_servers.group_by{|info| info['tags']['cid:priority']}
  end

  # 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' => @provider.name,
      '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