# frozen_string_literal: true

# Provides methods for working with cart items
class CartService
  def initialize(operator)
    @operator = operator
  end

  def from_hash(cart_items)
    items = []
    plan_info = plan(cart_items)

    @customer = User.find(cart_items[:customer_id])

    items.push(CartItem::Subscription.new(plan_info[:plan])) if cart_items[:subscription]
    items.push(reservable_from_hash(cart_items[:reservation], plan_info)) if cart_items[:reservation]

    coupon = CartItem::Coupon.new(@customer, @operator, cart_items[:coupon_code])
    schedule = CartItem::PaymentSchedule.new(plan_info[:plan], coupon, cart_items[:payment_schedule])

    ShoppingCart.new(
      @customer,
      coupon,
      cart_items[:payment_method],
      items: items,
      payment_schedule: schedule
    )
  end

  private

  def plan(cart_items)
    plan = if @customer.subscribed_plan
             new_plan_being_bought = false
             @customer.subscribed_plan
           elsif cart_items[:subscription]
             new_plan_being_bought = true
             Plan.find(cart_items[:subscription][:plan_id])
           else
             new_plan_being_bought = false
             nil
           end
    { plan: plan, new_subscription: new_plan_being_bought }
  end

  def reservable_from_hash(cart_item, plan_info)
    return nil if cart_item[:reservable_id].blank?

    reservable = cart_item[:reservable_type].constantize.find(cart_item[:reservable_id])
    case reservable
    when Machine
      CartItem::MachineReservation.new(@customer,
                                       @operator,
                                       reservable,
                                       cart_item[:slots_attributes],
                                       plan: plan_info[:plan],
                                       new_subscription: plan_info[:new_subscription])
    when Training
      CartItem::TrainingReservation.new(@customer,
                                        @operator,
                                        reservable,
                                        cart_item[:slots_attributes],
                                        plan: plan_info[:plan],
                                        new_subscription: plan_info[:new_subscription])
    when Event
      CartItem::EventReservation.new(@customer,
                                     @operator,
                                     reservable,
                                     cart_item[:slots_attributes],
                                     normal_tickets: cart_item[:nb_reserve_places],
                                     other_tickets: cart_item[:tickets_attributes])
    when Space
      CartItem::SpaceReservation.new(@customer,
                                     @operator,
                                     reservable,
                                     cart_item[:slots_attributes],
                                     plan: plan_info[:plan],
                                     new_subscription: plan_info[:new_subscription])
    else
      raise NotImplementedError
    end
  end
end