import { Cart, Line } from '@inmotion/swift-libs';
import * as _ from 'lodash';
import { NEW_CART, OrderUtils, Product, ProductDisplayFunc, ProductUtils, Validator } from '@whittaker/swift-libs';
import { CartBuilderInput, LineInput } from './models.cart';

export class CartCreateUtils {

  constructor() {
  }

  public transformCommonCartBuilderInputProperties(cart: Cart, addEmptyLineIfNone: boolean = true): CartBuilderInput {
    if (!cart) return null;
    let input = new CartBuilderInput();
    input.guid = cart.CartId;
    input.userEmail = cart.User ? cart.User.EmailAddress : null;

    if (Validator.hasValues(cart.Lines)) {
      input.lines = this.mapInputLines(cart.Lines);
    } else {
      input.lines = [];
      if (addEmptyLineIfNone) input.lines.push(new LineInput());
    }

    input.shipping = cart.Shipping;
    input.billing = cart.Billing;
    input.paymentMethod = OrderUtils.getPaymentMethod(cart);
    input.paymentVoucher = cart.Payment.Voucher;
    input.discountSku = cart.Discount && cart.Discount.Sku ? cart.Discount.Sku : null;

    return input;
  }

  public skuOnHandNameProductDisplay(): ProductDisplayFunc {
    return (p: Product): string => `(${p.Sku}) OnHand: ${p.Inventory.OnHand} \r\n${p.Name}`;
  }


  public getCartGuid(cart: Cart): string {
    return cart ? (cart.CartId || cart.__i ? cart.__i.guid : null) : null;
  }

  public isNew(cartGuid: string): boolean {
    return !cartGuid || cartGuid == NEW_CART;
  }

  public isGuest(email: string) {
    const DEFAULT_CART_EMAIL = 'api@buildinmotion.com';
    return !email || email == DEFAULT_CART_EMAIL;
  }

  public validateLineInput(lineInput: LineInput): void {
    Validator.throwIfNil(lineInput, `Missing params to add line.`);
    Validator.throwIfNil(lineInput.product, `Missing p.product`);
    Validator.throwIfNil(lineInput.product.Id, `Missing p.product.Id`);
    Validator.throwIfNil(lineInput.quantity, `Missing p.quantity`);
  }

  protected toInputLine(line: Line): LineInput {
    if (!line) return null;
    return {
      //product: ProductUtils.toSimpleInstance(line.Product, this.skuOnHandNameProductDisplay()),
      product: ProductUtils.toSimpleInstance(line.Product, null),
      sku: line.Sku,
      quantity: line.Quantity
    };
  }

  protected mapInputLines(lines: Line[]): LineInput[] {
    return _.map(lines, line => this.toInputLine(line));
  }
}