import { Injectable } from '@angular/core';
import { BehaviorSubject } from 'rxjs/internal/BehaviorSubject';
import { Observable } from 'rxjs';
import { environment } from '../../environments/environment';
import { HttpClient } from '@angular/common/http';

@Injectable({
  providedIn: 'root'
})
export class CartService {

  constructor(private httpClient: HttpClient) { }

  public itemsInCartSource = new BehaviorSubject<string>(localStorage.getItem('cartItems'));
  public taxGroupSourceBS: BehaviorSubject<any[]> = new BehaviorSubject([{}]);
  public taxGroupData = this.taxGroupSourceBS.asObservable();
  public taxSlabSourceBS: BehaviorSubject<any[]> = new BehaviorSubject([{}]);
  public taxSlabData = this.taxSlabSourceBS.asObservable();

  public isWalletAmountUsedSource = new BehaviorSubject<boolean>(false);
  public usedWalletAmountSource = new BehaviorSubject<number>(0);

  setIsWalletAmountUsed(item: boolean) {
    this.isWalletAmountUsedSource.next(item);
  }

  getIsWalletAmountUsed() :Observable<boolean> {
    return this.isWalletAmountUsedSource.asObservable();
  }

  setUsedWalletAmount(item: number) {
    this.usedWalletAmountSource.next(item);
  }

  getUsedWalletAmount() :Observable<number> {
    return this.usedWalletAmountSource.asObservable();
  }

  setItemsInCart(items: string) {
    this.itemsInCartSource.next(items);
  }

  getSum(array,attribute) {
    var total = 0
    for (var i = 0; i < array.length; i++) {
      total += array[i][attribute];
    }
    return total;
  }

  getItemsInCart() :Observable<string> {
    return this.itemsInCartSource.asObservable();
  }

  taxGroupDatafn(value: any) {
    this.taxGroupSourceBS.next(value);
  }

  taxSlabDatafn(value: any) {
    this.taxSlabSourceBS.next(value);
  }

  updateItemsInCart(product,operationType) {
      let itemsInCart = JSON.parse(localStorage.getItem('cartItems'));
      itemsInCart.find(cartItem => {
        if (cartItem.item_id === product.item_id && cartItem.variant_id === product.variant_id) {
          
          if(operationType === "decrement")
              cartItem.numItems = cartItem.numItems-1;
          else
            cartItem.numItems = cartItem.numItems+1;

          cartItem.totalDiscountPrice = cartItem.discount_price*cartItem.numItems;
          cartItem.totalSalesPrice = cartItem.sales_price*cartItem.numItems;
        }
      })
      itemsInCart = itemsInCart.filter(cartItem => cartItem.numItems>0);
      localStorage.cartItems = JSON.stringify(itemsInCart);
      this.setItemsInCart(JSON.stringify(itemsInCart))
  }

  checkout(data) {
    return this.httpClient.post(`${environment.apiUrl}/api/v1/customers/customer_payment/checkout`,data);
  }
}