class RailsAiAdmin::Fields::Projection

# File lib/rails_ai_admin/fields/projection.rb, line 11
def initialize(access, record, fields)
  @access, @record = access, record
  @fields = fields.index_by(&:name)
  @computed = fields.any?(&:virtual?)
  @cache = {}
  @bytes = 0
  @deadline = monotonic + MAX_SECONDS
end

# File lib/rails_ai_admin/fields/projection.rb, line 26
def value(field)
  check_deadline!
  raise AccessDenied unless @fields[field.name].equal?(field)
  return @cache[field.name] if @cache.key?(field.name)
  unless field.virtual?
    scalar = @access.read_attribute(@record, field)
    check_deadline!
    return @cache[field.name] = scalar
  end
  computed = ActiveRecord::Base.while_preventing_writes do
    dependencies = field.dependencies.to_h { |name| [ name.to_s, snapshot(value(@fields.fetch(name))) ] }.freeze
    check_bound!(dependencies)
    field.compute(dependencies, time_zone: @access.context.time_zone)
  end
  check_deadline!
  @bytes += check_bound!(computed)
  raise ConfigurationError, "Computed projection exceeds output bound" if @bytes > MAX_OUTPUT_BYTES
  @cache[field.name] = computed
end

# File lib/rails_ai_admin/fields/projection.rb, line 20
def values(fields: @fields.values)
  result = fields.to_h { |field| [ field.name.to_s, value(field) ] }
  check_deadline!
  result
end