require 'date'

module Rawbotz
  class OrderProcessor
    def initialize(order, logger=Logger.new("/dev/null"))
      @order = order
      @logger = logger
      @form_token = YAML::load_file(
        Rawbotz::conf_file_path)["remote_shop"]["form_token"]
    end

    # Yield items, if block given
    def process!
      mech = Rawbotz::new_mech
      mech.login

      @order.order_items.processible.find_each do |item|
        if item.remote_product_id.present? && item.num_wished.present?
          log_product_handling item

          begin
            ordered_qty = mech.add_to_cart! item.remote_product_id, item.num_wished, @form_token
          rescue Exception => e
            STDERR.puts e.message.to_s
            STDERR.puts e.backtrace
            ordered_qty = nil
            item.update(state: "error")
          end

          item.update(num_ordered: ordered_qty.to_i)

          log_result item

          yield item if block_given?
        else
          @logger.warn("Cannot order this item (no rem. prod/num_wished)")
          @logger.warn(item.attributes)
        end
      end
      @order.update(ordered_at: DateTime.now)
    end

    # Returns diff -> perfect: [], ...
    def check_against_cart
      diff = {perfect: [], under_avail: [], extra: [], modified: [], miss: [], error: []}.to_h
      # have logger
      mech = Rawbotz::new_mech
      mech.login
      cart_c = mech.get_cart_content
      cart = cart_c.map{|i| [i[0],i[1]]}.to_h

      @order.order_items.processible.find_each do |item|
        remote_name = item.local_product.try(:remote_product).try(:name)
        qty = cart.delete remote_name
        # missing case: more than wanted
        if !qty.nil?
          # Is in cart
          if qty.to_i == item.num_wished && qty.to_i == item.num_ordered
            diff[:perfect] << [item, qty.to_i]
          elsif qty.to_i == item.num_ordered
            diff[:under_avail] << [item, qty.to_i]
          else
            # + information qty.to_i
            diff[:modified] << [item, qty.to_i]
          end
        else
          diff[:miss] << [item, nil]
          # probably not available
        end
      end
      cart.each do |name, qty|
        diff[:extra] << [name, qty]
      end

      @order.order_items.where(state: "error").find_each do |item|
        diff[:error] << [item.local_product.name]
      end

      diff
    end

    private

    def log_product_handling item
      @logger.info ("Will put in cart: #{item.remote_product_id}: #{item.num_wished}")
      @logger.debug ("  Local  Product: #{item.local_product.name}")
      @logger.debug ("  Remote Product: #{item.local_product.remote_product.name}")
    end

    def log_result item
      if item.state == "error"
        @logger.warn "Error when ordering #{item.num_wished} #{item.local_product.name}"
      end
      if item.out_of_stock?
        @logger.info "Product out of stock"
      elsif !item.all_ordered?
        @logger.info "Only #{item.num_ordered} (of #{item.num_wished}) could be ordered."
      else
        @logger.info "Ordered #{item.num_ordered} (of #{item.num_wished})."
      end
    end
  end
end