import accounting from "accounting-js";

/**
 * @param {Object} [billingAddress] Billing address, if one was collected
 * @param {String} [cartId] The source cart ID, if applicable
 * @param {Object} collections Map of MongoDB collections
 * @param {String} currencyCode The currency code
 * @param {Object} group The order fulfillment group
 * @param {String} orderId The order ID
 * @returns {Object} Valid CommonOrder for the given order group
 */
export default async function xformOrderGroupToCommonOrder({
  accountId = null,
  billingAddress = null,
  cartId,
  collections,
  currencyCode,
  group,
  orderId,
  discountTotal
}) {
  // ** If you add any data here, be sure to add the same data to the matching xformCartGroupToCommonOrder xform
  const items = group.items.map((item) => ({
    _id: item._id,
    attributes: item.attributes,
    isTaxable: item.isTaxable,
    parcel: item.parcel,
    price: item.price,
    productId: item.productId,
    productVendor: item.productVendor,
    quantity: item.quantity,
    shopId: item.shopId,
    subtotal: {
      amount: +accounting.toFixed(item.price.amount * item.quantity, 3),
      currencyCode
    },
    taxCode: item.taxCode,
    title: item.title,
    variantId: item.variantId,
    variantTitle: item.variantTitle
  }));

  const { address, shipmentMethod, shopId, type: fulfillmentType } = group;
  const shop = await collections.Shops.findOne({ _id: shopId });

  let fulfillmentPrices = {
    handling: null,
    shipping: null,
    total: null
  };
  let fulfillmentMethodId;

  if (shipmentMethod) {
    fulfillmentPrices = {
      handling: {
        amount: shipmentMethod.handling || 0,
        currencyCode
      },
      shipping: {
        amount: shipmentMethod.rate || 0,
        currencyCode
      },
      total: {
        amount: +accounting.toFixed((shipmentMethod.handling || 0) + (shipmentMethod.rate || 0), 3),
        currencyCode
      }
    };

    fulfillmentMethodId = shipmentMethod._id;
  }

  // TODO: In the future, we should update this with a discounts update
  // Discounts are stored as the sum of all discounts, per cart. This will need to be updated when we refactor discounts to go by group.
  const groupItemTotal = +accounting.toFixed(group.items.reduce((sum, item) => (sum + item.subtotal), 0), 3);
  // orderItemTotal will need to be updated to be the actual total when we eventually have more than one group available
  const orderItemTotal = groupItemTotal;

  const totals = {
    groupDiscountTotal: {
      amount: discountTotal,
      currencyCode
    },
    groupItemTotal: {
      amount: groupItemTotal,
      currencyCode
    },
    groupTotal: {
      amount: +accounting.toFixed(groupItemTotal - discountTotal, 3),
      currencyCode
    },
    orderDiscountTotal: {
      amount: discountTotal,
      currencyCode
    },
    orderItemTotal: {
      amount: orderItemTotal,
      currencyCode
    },
    orderTotal: {
      amount: +accounting.toFixed(orderItemTotal - discountTotal, 3),
      currencyCode
    }
  };

  return {
    accountId,
    billingAddress,
    cartId,
    currencyCode,
    fulfillmentMethodId,
    fulfillmentPrices,
    fulfillmentType,
    items,
    orderId,
    originAddress: (shop && Array.isArray(shop.addressBook) && shop.addressBook[0]) || null,
    shippingAddress: address || null,
    shopId,
    sourceType: "order",
    totals
  };
}
