# frozen_string_literal: true

module Spree
  class SimpleOrderContents
    attr_accessor :order

    def initialize(order)
      @order = order
    end

    # Add a line items to the order if there is inventory to do so
    # and populate Promotions
    #
    # @param [Spree::Variant] variant The variant the line_item should
    #   be associated with
    # @param [Integer] quantity The line_item quantity
    # @param [Hash] options Options for the adding proccess
    #   Valid options:
    #     shipment: [Spree::Shipment] LineItem target shipment
    #
    # @return [Spree::LineItem]
    def add(variant, quantity = 1, options = {})
      line_item = add_to_line_item(variant, quantity, options)
      after_add_or_remove(line_item, options)
    end

    def remove(variant, quantity = 1, options = {})
      line_item = remove_from_line_item(variant, quantity, options)
      after_add_or_remove(line_item, options)
    end

    def remove_line_item(line_item, options = {})
      order.line_items.destroy(line_item)
      after_add_or_remove(line_item, options)
    end

    def update_cart(params)
      if order.update(params)
        unless order.completed?
          order.line_items = order.line_items.select { |li| li.quantity > 0 }
          order.check_shipments_and_restart_checkout
        end
        reload_totals
        true
      else
        false
      end
    end

    def advance
      while @order.next; end
    end

    def approve(user: nil, name: nil)
      if user.blank? && name.blank?
        raise ArgumentError, 'user or name must be specified'
      end

      order.update!(
        approver: user,
        approver_name: name,
        approved_at: Time.current
      )
    end

    private

    def after_add_or_remove(line_item, options = {})
      shipment = options[:shipment]
      shipment.present? ? shipment.update_amounts : order.check_shipments_and_restart_checkout
      reload_totals
      line_item
    end

    def reload_totals
      @order.recalculate
    end

    def add_to_line_item(variant, quantity, options = {})
      line_item = grab_line_item_by_variant(variant, false, options)

      line_item ||= order.line_items.new(
        quantity: 0,
        variant:,
        adjustments: []
      )

      line_item.quantity += quantity.to_i
      line_item.options = ActionController::Parameters.new(options).permit(PermittedAttributes.line_item_attributes).to_h

      line_item.target_shipment = options[:shipment]
      line_item.save!
      line_item
    end

    def remove_from_line_item(variant, quantity, options = {})
      line_item = grab_line_item_by_variant(variant, true, options)
      line_item.quantity -= quantity
      line_item.target_shipment = options[:shipment]

      if line_item.quantity <= 0
        order.line_items.destroy(line_item)
      else
        line_item.save!
      end

      line_item
    end

    def grab_line_item_by_variant(variant, raise_error = false, options = {})
      line_item = order.find_line_item_by_variant(variant, options)

      if line_item.blank? && raise_error
        raise ActiveRecord::RecordNotFound, "Line item not found for variant #{variant.sku}"
      end

      line_item
    end
  end
end