# frozen_string_literal: true

require 'open_food_network/address_finder'

class SplitCheckoutController < ::BaseController
  layout 'darkswarm'

  include OrderStockCheck
  include Spree::BaseHelper
  include CheckoutCallbacks

  helper 'terms_and_conditions'
  helper 'checkout'
  helper 'spree/orders'
  helper OrderHelper

  def edit
    return handle_redirect_from_stripe if valid_payment_intent_provided?

    redirect_to_step unless checkout_step

    OrderWorkflow.new(@order).next if @order.cart?

    # This is only required because of spree_paypal_express. If we implement
    # a version of paypal that uses this controller, and more specifically
    # the #action_failed method, then we can remove this call
    # OrderCheckoutRestart.new(@order).call
    @order.errors.clear
    @order.bill_address.errors.clear
    @order.ship_address.errors.clear
    @ship_address_same_as_billing = "1" if ship_address_matches_bill_address?
  rescue Spree::Core::GatewayError => e
    rescue_from_spree_gateway_error(e)
  end

  def update
    load_shipping_method
    handle_shipping_method_selection

    if confirm_order || update_order
      clear_invalid_payments
      redirect_to_step
    else
      if @shipping_method_id.blank?
        @order.errors.add(:base, "no_shipping_method_selected")
      end
      flash.now[:error] = "#{I18n.t('split_checkout.errors.global')}"
      render :edit
    end
  end

  private

  def ship_address_matches_bill_address?
    attrs_to_check = %w(firstname lastname address1 address2 state_id city zipcode phone country_id)
    ((@order.bill_address.attributes.to_a -
      @order.ship_address.attributes.to_a).map(&:first) & attrs_to_check).blank?
  end

  def handle_shipping_method_selection
    return unless @shipping_method

    populate_ship_address_params
  end

  def load_shipping_method
    if params[:shipping_method_id]
      @shipping_method = Spree::ShippingMethod.where(id: params[:shipping_method_id]).first
      @shipping_method_id = params[:shipping_method_id]
    else
      @shipping_method = @order.shipping_method
      @shipping_method_id = @shipping_method&.id
    end
  end

  def populate_ship_address_params
    return unless params.dig(:order, :ship_address_attributes).present? &&
                  params.dig(:order, :bill_address_attributes).present?

    if params.dig(:order, "Checkout.ship_address_same_as_billing") == "1"
      params[:order][:ship_address_attributes] = params[:order][:bill_address_attributes]
      return
    end

    address_attrs = [
      :firstname,
      :lastname,
      :phone,
      :address1,
      :address2,
      :city,
      :state_id,
      :zipcode,
      :country_id,
      :id
    ]
    address_attrs.each do |attr|
      next if params[:order][:ship_address_attributes][attr].present?

      params[:order][:ship_address_attributes][attr] = params[:order][:bill_address_attributes][attr]
    end
  end

  def clear_invalid_payments
    @order.payments.with_state(:invalid).delete_all
  end

  def confirm_order
    return unless @order.confirmation? && params[:confirm_order]
    return unless validate_terms_and_conditions!

    @order.confirm!
  end

  def update_order
    return unless params[:order]
    return if @order.state == "address" && params[:shipping_method_id].blank?

    @order.update(order_params) && advance_order_state
  end

  def advance_order_state
    return true if @order.complete?

    OrderWorkflow.new(@order).advance_checkout(raw_params.slice(:shipping_method_id))
  end

  def checkout_step
    @checkout_step ||= params[:step]
  end

  def validate_terms_and_conditions!
    return true if params[:accept_terms]

    @order.errors.add(:terms_and_conditions, t("split_checkout.errors.terms_not_accepted"))
    false
  end

  def order_params
    return @order_params unless @order_params.nil?

    @order_params = params.require(:order).permit(
      :email, :shipping_method_id, :special_instructions,
      bill_address_attributes: PermittedAttributes::Address.attributes,
      ship_address_attributes: PermittedAttributes::Address.attributes,
      payments_attributes: [:payment_method_id]
    )

    set_payment_amount

    @order_params
  end

  def set_payment_amount
    return unless @order_params[:payments_attributes]

    @order_params[:payments_attributes].first[:amount] = @order.total
  end

  def redirect_to_step
    case @order.state
    when "cart", "address", "delivery"
      redirect_to checkout_step_path(:details)
    when "payment"
      redirect_to checkout_step_path(:payment)
    when "confirmation"
      redirect_to checkout_step_path(:summary)
    else
      redirect_to order_path(@order)
    end
  end

  def valid_payment_intent_provided?
    return false unless params["payment_intent"]&.starts_with?("pi_")

    last_payment = OrderPaymentFinder.new(@order).last_payment
    @order.state == "payment" &&
      last_payment&.state == "requires_authorization" &&
      last_payment&.response_code == params["payment_intent"]
  end

  def handle_redirect_from_stripe
    return checkout_failed unless @order.process_payments!

    if OrderWorkflow.new(@order).next && order_complete?
      checkout_succeeded
      redirect_to(order_path(@order)) && return
    else
      checkout_failed
    end
  end

  def order_complete?
    @order.state == "complete" || @order.completed?
  end

  def rescue_from_spree_gateway_error(error)
    flash[:error] = t(:spree_gateway_error_flash_for_checkout, error: error.message)
    action_failed(error)
  end
end