module Eco::Data::Locations
  # Differences between node before and after
  # @note this works with `Hash` object where basic keys are:
  #   - `nodeId`
  #   - `name`
  #   - `parentId`
  #   - `archived`
  # @note other properties can be part of the `Hash` although
  #   they may not influence the results.
  class NodeDiff < Eco::Data::Hashes::DiffResult
    require_relative 'node_diff/accessors'
    require_relative 'node_diff/selectors'
    require_relative 'node_diff/nodes_diff'

    include Eco::Data::Locations::NodeDiff::Accessors

    key     :nodeId
    compare :parentId, :name, :archived
    case_sensitive false

    attr_expose :nodeId, :name, :parentId, :archived

    alias_method :insert?, :new?

    alias_method :diff_name_src?, :diff_name?
    # Has the property `name` changed?
    def diff_name?
      diff_name_src? && update?
    end
    alias_method :name?, :diff_name?
    alias_method :id? , :diff_name? # currently a change of name is a change of id (tag)
    #alias_method :id? , :key?
    #alias_method :nodeId? , :id?

    # Has any of `id` or `name` properties changed?
    def id_name?
      id? || diff_name?
    end

    # Has the parent id changed?
    def move?
      update? && diff_parentId?
    end

    # Has the `archived` property changed and it was `true`?
    def unarchive?
      !archived && update? && diff_archived?
    end

    # Has the `archived` property changed and it was `false`?
    def archive?
      !prev_archived && (del? || archived)
    end
  end
end