class RailsAiAdmin::Queries::NamedScope

# File lib/rails_ai_admin/queries/named_scope.rb, line 18
def initialize(name, body = nil, label: nil, default: false)
  unless (name.is_a?(String) || name.is_a?(Symbol)) && name.to_s.match?(NAME)
    raise ConfigurationError, "Named scope needs a lowercase identifier of at most 40 characters"
  end
  unless body.nil? || body.is_a?(Proc) && body.lambda? && body.arity.zero?
    raise ConfigurationError, "Named scope body must be a zero-argument lambda"
  end
  raise ConfigurationError, "Named scope default must be boolean" unless [ true, false ].include?(default)
  @name = name.to_sym
  @label = Navigation::Settings.caption(label) || Navigation::Settings.caption(@name.to_s.humanize)
  @body = body
  @default = default
  freeze
end

# File lib/rails_ai_admin/queries/named_scope.rb, line 37
def apply(relation)
  return relation if body.nil?
  model = relation.klass
  primary_key = model.primary_key
  raise ConfigurationError, "Named scopes require a single-column primary key" unless primary_key.is_a?(String)
  candidate = build(model)
  unless candidate.is_a?(ActiveRecord::Relation) && candidate.klass == model
    raise ConfigurationError, "Named scope #{name} must return the resource's ActiveRecord relation"
  end
  if candidate.limit_value || candidate.offset_value || candidate.select_values.any? || candidate.group_values.any? ||
      !candidate.having_clause.empty? || !candidate.from_clause.empty? ||
      candidate.includes_values.any? || candidate.eager_load_values.any? || candidate.preload_values.any?
    raise ConfigurationError, "Named scope #{name} must be a filter relation without limit, offset, select, group, having, from or eager loading"
  end
  relation.where(primary_key => candidate.unscope(:order).select(model.arel_table[primary_key]))
end

# File lib/rails_ai_admin/queries/named_scope.rb, line 56
def build(model)
  ActiveRecord::Base.while_preventing_writes { model.all.instance_exec(&body) }
rescue ConfigurationError
  raise
rescue StandardError
  raise ConfigurationError, "Named scope #{name} failed", cause: nil
end

# File lib/rails_ai_admin/queries/named_scope.rb, line 33
  def default? = @default

  # Returns the policy relation narrowed to this scope. Trusted host Ruby
  # still runs here; writes are prevented and failures stay generic.
  def apply(relation)
    return relation if body.nil?
    model = relation.klass
    primary_key = model.primary_key
    raise ConfigurationError, "Named scopes require a single-column primary key" unless primary_key.is_a?(String)
    candidate = build(model)
    unless candidate.is_a?(ActiveRecord::Relation) && candidate.klass == model
      raise ConfigurationError, "Named scope #{name} must return the resource's ActiveRecord relation"
    end
    if candidate.limit_value || candidate.offset_value || candidate.select_values.any? || candidate.group_values.any? ||
        !candidate.having_clause.empty? || !candidate.from_clause.empty? ||
        candidate.includes_values.any? || candidate.eager_load_values.any? || candidate.preload_values.any?
      raise ConfigurationError, "Named scope #{name} must be a filter relation without limit, offset, select, group, having, from or eager loading"
    end
    relation.where(primary_key => candidate.unscope(:order).select(model.arel_table[primary_key]))
  end

  private

  def build(model)
    ActiveRecord::Base.while_preventing_writes { model.all.instance_exec(&body) }
  rescue ConfigurationError
    raise
  rescue StandardError
    raise ConfigurationError, "Named scope #{name} failed", cause: nil
  end
end