# Copyright (C) 2012-2014 Zammad Foundation, http://zammad-foundation.org/

class Tag < ApplicationModel
  belongs_to :tag_object,       class_name: 'Tag::Object'
  belongs_to :tag_item,         class_name: 'Tag::Item'

  @@cache_item = {}
  @@cache_object = {}

  def self.tag_add(data)

    # lookups
    if data[:object]
      tag_object_id = self.tag_object_lookup( data[:object] )
    end
    if data[:item]
      tag_item_id = self.tag_item_lookup( data[:item] )
    end

    # create history
    Tag.create(
      tag_object_id: tag_object_id,
      tag_item_id: tag_item_id,
      o_id: data[:o_id],
      created_by_id: data[:created_by_id],
    )
    return true
  end

  def self.tag_remove(data)

    # lookups
    if data[:object]
      tag_object_id = self.tag_object_lookup( data[:object] )
    end
    if data[:item]
      tag_item_id = self.tag_item_lookup( data[:item] )
    end

    # create history
    result = Tag.where(
      tag_object_id: tag_object_id,
      tag_item_id: tag_item_id,
      o_id: data[:o_id],
    )
    result.each { |item|
      item.destroy
    }
    return true
  end

  def self.tag_list( data )
    tag_object_id_requested = self.tag_object_lookup( data[:object] )
    tag_search = Tag.where(
      tag_object_id: tag_object_id_requested,
      o_id: data[:o_id],
    )
    tags = []
    tag_search.each {|tag|
      tags.push self.tag_item_lookup_id( tag.tag_item_id )
    }
    return tags
  end

  private

  def self.tag_item_lookup_id( id )

    # use cache
    return @@cache_item[ id ] if @@cache_item[ id ]

    # lookup
    tag_item = Tag::Item.find(id)
    @@cache_item[ id ] = tag_item.name
    return tag_item.name
  end

  def self.tag_item_lookup( name )

    name = name.downcase

    # use cache
    return @@cache_item[ name ] if @@cache_item[ name ]

    # lookup
    tag_item = Tag::Item.where( name: name ).first
    if tag_item
      @@cache_item[ name ] = tag_item.id
      return tag_item.id
    end

    # create
    tag_item = Tag::Item.create(
      name: name
    )
    @@cache_item[ name ] = tag_item.id
    return tag_item.id
  end

  def self.tag_object_lookup_id( id )

    # use cache
    return @@cache_object[ id ] if @@cache_object[ id ]

    # lookup
    tag_object = Tag::Object.find(id)
    @@cache_object[ id ] = tag_object.name
    return tag_object.name
  end

  def self.tag_object_lookup( name )

    # use cache
    return @@cache_object[ name ] if @@cache_object[ name ]

    # lookup
    tag_object = Tag::Object.where( name: name ).first
    if tag_object
      @@cache_object[ name ] = tag_object.id
      return tag_object.id
    end

    # create
    tag_object = Tag::Object.create(
      name: name
    )
    @@cache_object[ name ] = tag_object.id
    return tag_object.id
  end

  class Object < ActiveRecord::Base
  end

  class Item < ActiveRecord::Base
  end

end