class ChefCLI::Policyfile::Lister

def active_revisions
  @active_revisions ||= policies_by_group.inject(Set.new) do |set, (_group, policy_name_rev_id_map)|
    policy_name_rev_id_map.each do |policy_name, rev_id|
      set << rev_id
    end
    set
  end
end

def empty?
  policies_by_name.empty? && policies_by_group.empty?
end

def fetch_policy_lists
  policy_list_data = http_client.get("policies")
  set_policies_by_name_from_api(policy_list_data)
  policy_group_data = http_client.get("policy_groups")
  set_policies_by_group_from_api(policy_group_data)
end

def http_client
  @http_client ||= Chef::ServerAPI.new(config.chef_server_url,
    signing_key_filename: config.client_key,
    client_name: config.node_name)
end

def initialize(config: nil)
  @config = config
  @policies_by_name = nil
  @policies_by_group = nil
  @policy_lock_content = {}
  @active_revisions = nil
end

def orphaned_revisions(policy_name)
  orphans = []
  policies_by_name[policy_name].each do |rev_id, _data|
    orphans << rev_id unless active_revisions.include?(rev_id)
  end
  orphans
end

def policies_by_group
  @policies_by_group || fetch_policy_lists
  @policies_by_group
end

def policies_by_name
  @policies_by_name || fetch_policy_lists
  @policies_by_name
end

def revision_ids_by_group_for(policy_name)
  map = policies_by_group.inject({}) do |rev_id_map, (group_name, rev_id_map_for_group)|
    rev_id_map[group_name] = rev_id_map_for_group[policy_name]
    rev_id_map
  end
  PolicyGroupRevIDMap.new(policy_name, map)
end

def revision_ids_by_group_for_each_policy
  policies_by_name.each do |policy_name, _policies|
    rev_id_by_group = revision_ids_by_group_for(policy_name)
    yield policy_name, rev_id_by_group
  end
end

def revision_info_for(policy_name, _revision_id_list)
  RevIDLockDataMap.new(policy_name, policy_lock_content[policy_name])
end

def set!(policies_by_name, policies_by_group)
  @policies_by_name = policies_by_name
  @policies_by_group = policies_by_group
  @active_revisions = nil
end

def set_policies_by_group_from_api(policy_group_data)
  @policies_by_group = policy_group_data.inject({}) do |map, (policy_group, policy_info)|
    map[policy_group] = (policy_info["policies"] || []).inject({}) do |rev_map, (policy_name, rev_info)|
      rev_map[policy_name] = rev_info["revision_id"]; rev_map
    end
    map
  end
end

def set_policies_by_name_from_api(policy_list_data)
  @policies_by_name = policy_list_data.inject({}) do |map, (policy_name, policy_info)|
    map[policy_name] = policy_info["revisions"]
    map
  end
end