# -*- encoding : utf-8 -*-
class MenuItem < ActiveRecord::Base

	belongs_to :menu_content, :polymorphic => true
	belongs_to :menu
	validates :name, :presence => true
	validates :slug, :presence => true


	attr_accessor :skip_before_update, :skip_permalink
	
	
	accepts_nested_attributes_for :menu_content

	acts_as_tree

	def url
		if menu_content
			self.permalink
			
		else
			"/404.html"
		end
	end

	before_validation do
		self.slug = self.slug.to_slug
		
	end
	
	before_save do 
		#self.set_permalink
	end

	def generate_permalink
		r = ""
		
		node, ancestors = self, []
		ancestors << node = MenuItem.find(node.parent_id) while node.parent_id?
		      
		
		
		ancestors.reverse.each do |ancestor|
			r += ancestor.slug.to_s
			r+= "/"
		end
		r+= self.slug.to_s
	end
	
	def set_permalink
		
		
		if !skip_permalink
			
			self.permalink = self.generate_permalink
			self.skip_permalink = true
			self.skip_before_update = true
			
			
			
			self.save
		
		
		#	self.children.each do |child|				
		#		child.save
		#	end
		end
		
	end
	
	
	
	def validate
		self.parent_id = nil if self.parent_id == 0
		errors.add(:parent_id, 'doit être différent de la page actuelle') if parent_id == id and id != nil
		
		if self.id
			errors.add(:parent_id, 'attention la page parente à pour page parente celle-ci = boucle') if self.parent_id and self.id == MenuItem.find(self.parent_id).parent_id
		end

		conditions = ["menu_id = ? and parent_id "+(self.parent_id ? "=" : "IS")+" ? and slug = ? "+("and id != ?" if self.id).to_s, self.menu_id,self.parent_id ,self.slug]
		conditions << self.id if self.id
		if MenuItem.where(conditions).first
			errors.add(:slug, 'est déjà utilisé') 
			
		end

	end
	
	




	before_create do
		if !position
			top = MenuItem.find(:first, :conditions =>{ :parent_id => self.parent_id, :menu_id => self.menu_id}, :order => "position DESC")
			if top
				self.position = top.position.to_i + 1
			else
				self.position = 1
			end
		end
		if position
			MenuItem.find(:all, :conditions => ["menu_id = ? and position >= ? and parent_id "+(self.parent_id ? "=" : "IS")+" ?",self.menu_id,self.position,self.parent_id]).each do |portlet|
				portlet.position = portlet.position + 1
				portlet.skip_before_update = true
				portlet.save!
			end
		end
	end

	before_update do
		if !skip_before_update
			if self.parent_id_changed?
				
				MenuItem.find(:all, :conditions => ["menu_id = ? and position > ? and parent_id "+(self.changes['parent_id'][0] ? "=" : "IS")+" ?",self.menu_id,self.position,self.changes['parent_id'][0]]).each do |portlet|
					portlet.position = portlet.position - 1
					portlet.skip_before_update = true
					portlet.save!
				end
				
				self.position = 1
				
				MenuItem.find(:all, :conditions => ["menu_id = ? and parent_id "+(self.parent_id ? "=" : "IS")+" ?",self.menu_id,self.parent_id]).each do |portlet|
					portlet.position = portlet.position + 1
					portlet.skip_before_update = true
					portlet.save!
				end
				
				
				
				
			elsif self.position_changed?
				
				top = MenuItem.find(:first, :conditions =>{ :parent_id => self.parent_id, :menu_id => self.menu_id}, :order => "position DESC")
				
				if self.changes['position'][1] > self.changes['position'][0]
					self.position = self.position - 1
					self.changes['position'][1] = self.changes['position'][1] - 1
					
					MenuItem.find(:all, :conditions => ["menu_id = ? and position > ? and position <= ? and parent_id "+(self.parent_id ? "=" : "IS")+" ?",self.menu_id,self.changes['position'][0],self.changes['position'][1],self.parent_id]).each do |portlet|
						portlet.position = portlet.position - 1
						portlet.skip_before_update = true
						portlet.save!
					end
					
					
				
					
				#si la position est plus petite que l'ancienne.	
				elsif self.changes['position'][1] < self.changes['position'][0]
					MenuItem.find(:all, :conditions => ["menu_id = ? and position >= ? and position < ? and parent_id "+(self.parent_id ? "=" : "IS")+" ?",self.menu_id,self.changes['position'][1],self.changes['position'][0],self.parent_id]).each do |portlet|
						portlet.position = portlet.position + 1
						portlet.skip_before_update = true
						portlet.save!
					end	
				end 
			end
		end
	end

	before_destroy do
		MenuItem.find(:all, :conditions => ["menu_id = ? and position > ? and parent_id "+(self.parent_id ? "=" : "IS")+" ?",self.menu_id,self.position,self.parent_id]).each do |portlet|
			portlet.position = portlet.position - 1
			portlet.skip_before_update = true
			portlet.save!
		end

	end
	
	
	
	
	
	
	


end