module Kanjai
	class CurrentPage

		attr_reader :domain, :lang, :url

		PAGE_ID = 0
		PARENT_PAGE_ID=1
		PAGE_URL=2
		PAGE_DATA_ID=3

		def initialize(domain:, lang:, url:)
			@domain = domain
			@lang = lang
			@url = url
		end

		def call
			mas = url.split('/').reject { |c| c.empty? }
			root_page = nil			
			page_datum = nil


			params = {}

			page_urls = prepare_data
			p url
			p page_urls

			record = page_urls.select{|item| item[:url] == url }.first
			if record
				page_datum = Kanjai::PageDatum.find(record[:data_id])
			else
				collection = page_urls.select{|item| item[:url].to_s.include?(':param') }
				collection.each do |item|
					if page_datum.nil?
						mas_url = url.split('/')
						mas_item_url = item[:url].split('/')

						if mas_url.count == mas_item_url.count
							mas_item_url.each_with_index do |segment, index|
								if segment == ':param'
									mas_item_url[index] = mas_url[index]
									params[:param] = mas_url[index]
								end
							end

							if mas_url == mas_item_url
								page_datum = Kanjai::PageDatum.find(item[:data_id])
							end

						end
					end
				end
			end

			if page_datum.nil? && url == '/'
				record = scope.select{|item| item[PAGE_URL] == '/' }.first
				if record
					page_datum = Kanjai::PageDatum.find(record[PAGE_DATA_ID])
				end
			end

			{page: page_datum, params: params}
		end

		private

		def scope
			@scope ||= domain.pages.joins("left join kanjai_page_data on kanjai_pages.id = kanjai_page_data.page_id and kanjai_page_data.lang='#{lang}'").pluck(:id, :parent_id, 'kanjai_page_data.url', "kanjai_page_data.id")
		end

		def prepare_data
			[].tap do |n|
				scope.each do |item|
				  url = ((item[PAGE_URL].to_s.first == '/' ? [] : generate_url(item[PARENT_PAGE_ID])) + [item[PAGE_URL]]).flatten.reject { |e| e.nil? || e&.empty? || e.to_s == '/' }.join('/')
				  url = '/' + url if url.to_s.present? && url.first != '/'
				  n << {
				    id: item[PAGE_ID],
				    data_id: item[PAGE_DATA_ID],
				    url: url
				  }
				end
			end
		end

		def generate_url(parent_id)
		  url = []
		  if parent_id
		    parent_item = scope.select{|item| item[PAGE_ID] == parent_id }.first
		    url = [parent_item[PAGE_URL]] + url
		    url = (parent_item[PAGE_URL].to_s.first == '/' ? [] : generate_url(parent_item[PARENT_PAGE_ID])) + url
		  end
		  return url
		end

	end
end