# Copyright (C) 2012-2024 Zammad Foundation, https://zammad-foundation.org/

module ApplicationModel::CanAssets
  extend ActiveSupport::Concern

=begin

get all assets / related models for this user

  user = User.find(123)
  result = user.assets(assets_if_exists)

returns

  result = {
    :User => {
      123  => user_model_123,
      1234 => user_model_1234,
    }
  }

=end

  def assets(data = {})
    return data if !authorized_asset?

    app_model = self.class.to_app_model

    if !data[ app_model ]
      data[ app_model ] = {}
    end
    if !data[ app_model ][ id ]
      data[ app_model ][ id ] = attributes_with_association_ids
    end

    return data if !self['created_by_id'] && !self['updated_by_id']

    app_model_user = User.to_app_model
    %w[created_by_id updated_by_id].each do |local_user_id|
      next if !self[ local_user_id ]
      next if data[ app_model_user ] && data[ app_model_user ][ self[ local_user_id ] ]

      user = User.lookup(id: self[ local_user_id ])
      next if !user

      data = user.assets(data)
    end
    data
  end

  def authorized_asset?
    true
  end

=begin

get assets and record_ids of selector

  model = Model.find(123)

  assets = model.assets_of_selector('attribute_name_of_selector', assets)

=end

  def assets_of_selector(selector, assets = {})
    send(selector)
      .each_with_object(assets) do |(item, content), memo|
        assets_of_single_selector(item, content, memo)
      end
  end

  def assets_added_to?(data)
    data.dig(self.class.to_app_model, id).present?
  end

  private

  def assets_of_single_selector(item, content, assets = {})
    area, key = item.split('.')
    return if !key
    return if %w[ticket_customer ticket_owner].include?(area)

    area = 'user' if %w[customer session].include? area

    attribute_ref_class, item_ids = if area == 'notification'
                                      notifications_assets_data(content)
                                    else
                                      non_notifications_assets_data(area, key, content)
                                    end

    return if !attribute_ref_class

    items = item_ids
      .compact_blank
      .filter_map { |elem| attribute_ref_class.lookup(id: elem) }

    ApplicationModel::CanAssets.reduce items, assets
  end

  def notifications_assets_data(content)
    return if content['recipient'].blank?

    item_ids = Array(content['recipient'])
      .filter_map do |elem|
        match = elem.match %r{\Auserid_(?<id>\d+)\z}

        match[:id] if match
      end

    [::User, item_ids]
  end

  def non_notifications_assets_data(area, key, content)
    return if %w[article execution_time].include? area

    begin
      attribute_class = area.to_classname.constantize
    rescue => e
      logger.error "Unable to get asset for '#{area}': #{e.inspect}"
      return
    end

    reflection = key.delete_suffix '_id'

    klass = Models.all.dig(attribute_class, :reflections, reflection)&.klass

    return if !klass

    [klass, Array(content['value'])]
  end

  # methods defined here are going to extend the class, not the instance of it
  class_methods do

=begin

return object and assets

  data = Model.full(123)
  data = {
    id:     123,
    assets: assets,
  }

=end

    def full(id)
      object = find(id)
      assets = object.assets({})
      {
        id:     object.id,
        assets: assets,
      }
    end

=begin

get assets of object list

  list = [
    {
      object => 'Ticket',
      o_id   => 1,
    },
    {
      object => 'User',
      o_id   => 121,
    },
  ]

  assets = Model.assets_of_object_list(list, assets)

=end

    def assets_of_object_list(list, assets = {})
      list.each do |item|
        record = item['object'].constantize.lookup(id: item['o_id'])
        next if record.blank?

        assets = record.assets(assets)
        if item['created_by_id'].present?
          user = User.find(item['created_by_id'])
          assets = user.assets(assets)
        end
        if item['updated_by_id'].present?
          user = User.find(item['updated_by_id'])
          assets = user.assets(assets)
        end
      end
      assets
    end
  end

  class << self

=begin

Compiles an assets hash for given items

@param items  [Array<CanAssets>] list of items responding to @see #assets
@param data   [Hash] given collection. Empty {} or assets collection in progress
@param suffix [String] try to use non-default assets method
@return [Hash] collection including assets of items

@example
  list = Ticket.all
  ApplicationModel::CanAssets.reduce(list, {})

=end

    def reduce(items, data = {}, suffix = nil)
      items.reduce(data) do |memo, elem|
        method_name = if suffix.present? && elem.respond_to?(:"assets_#{suffix}")
                        "assets_#{suffix}"
                      else
                        :assets
                      end

        elem.send method_name, memo
      end
    end
  end
end