import { Injectable } from '@angular/core';
import { MatDialog } from '@angular/material';
import { BehaviorSubject } from 'rxjs';
import { Observable } from 'rxjs/internal/Observable';
import { Product } from '../core/product';
import { ModifiersComponent } from './modifiers/modifiers.component';
import { ModifierCategoryService } from '../modifier-categories/modifier-category.service';
import { ModifierCategory } from '../core/modifier-category';
import { Bill, Inventory, Kot, PrintType } from './bills/bill';
import { VoucherService } from './bills/voucher.service';
import { ToasterService } from "../core/toaster.service";
import { tap } from "rxjs/operators";

@Injectable()
export class BillService {
  public dataObs;
  public data;
  private bill;

  constructor(
    private dialog: MatDialog,
    private toaster: ToasterService,
    private ser: VoucherService,
    private modifierCategoryService: ModifierCategoryService
  ) {
    this.data = [];
    this.dataObs = new BehaviorSubject<any[]>(this.data);
  }

  loadData(bill: Bill): void {
    this.bill = bill;
    const view = this.bill.kots.map(k => {
      return [{
        isKot: true,
        info: `Kot: ${k.code} / ${k.date} (${k.user.name}) `
      }, ...k.inventories.map(i => {
        return {
          id: i.id,
          isKot: false,
          product: i.product,
          productId: i.product.id,
          isHappyHour: i.isHappyHour,
          isPrinted: true,
          info: `${i.product.name} (${i.product.units}) @ ${i.price} - ${i.discount * 100}%`,
          price: i.price,
          quantity: i.quantity,
          discount: i.discount,
          taxRate: i.taxRate,
          tax: i.tax,
          modifiers: i.modifiers
        };
      })];
    });
    this.data = view.reduce((a, c) => a.concat(c) , []);
    this.data.push({isKot: true, newKot: true, info: '== New Kot =='});
    this.dataObs.next(this.data);

  }
  addProduct(product: Product): void {
    const old = this.data.find(x => !x.isKot && x.productId === product.id && x.isHappyHour === product.hasHappyHour);
    if (old !== undefined) {
      old.quantity += 1;
    } else {
      const item = {
        isKot: false,
        product: product,
        productId: product.id,
        isHappyHour: product.hasHappyHour,
        info: `${product.name} (${product.units}) @ ${product.price} - ${0}%`,
        price: product.price,
        quantity: 1,
        discount: 0,
        taxRate: product.saleCategory.tax.rate,
        tax: product.saleCategory.tax,
        modifiers: []
      };
      this.data.push(item);
      this.modifierCategoryService.listIsActiveOfProduct(product.id).subscribe(result => {
        if (result.reduce((a: any, c: ModifierCategory) => {
          return a + c.minimum;
        }, 0)) {
          this.showModifier(item);
        }
      });
    }
    this.dataObs.next(this.data);
  }

  showModifier(item: any): void {
    // [routerLink]="['/sales', 'modifiers', item.id]"
    const dialogRef = this.dialog.open(ModifiersComponent, {
      position: {
        top: '10vh'
      },
      data: {
        list: this.modifierCategoryService.listIsActiveOfProduct(item.productId),
        selected: item.modifiers
      }
    });

    dialogRef.afterClosed().subscribe(result => {
      if (result !== undefined) {
        item.modifiers = result;
      }
    });
  }

  addOne(item: any): void {
    item.quantity += 1;
    this.dataObs.next(this.data);
  }

  quantity(item: any, quantity: number): void {
    item.quantity = quantity;
    this.dataObs.next(this.data);
  }

  subtractOne(item: any): void {
    if (item.quantity > 1) {
      item.quantity -= 1;
      this.dataObs.next(this.data);
    } else if (item.quantity === 0) {
      this.removeItem(item);
    }
  }

  removeItem(item: any): void {
    this.data.splice(this.data.indexOf(item), 1);
    this.dataObs.next(this.data);
  }

  modifier(item: any): void {
    this.showModifier(item);
  }

  discount(discounts:{id: string, name: string, discount: number}[]): void {
    this.data.forEach(x=> {
      if (!x.isKot) {
        x.discount = discounts.find(d => d.id === x.product.saleCategory.id).discount / 100;
        x.info = `${x.product.name} (${x.product.units}) @ ${x.price} - ${x.discount * 100}%`;
      }
    });
    this.dataObs.next(this.data);
  }

  private getKot(): Kot {
    return new Kot({
      inventories: this.data.filter(x => !x.isKot && !x.isPrinted).map(y => new Inventory({
        product: y.product,
        quantity: y.quantity,
        price: y.price,
        isHappyHour: y.isHappyHour,
        discount: y.discount,
        modifiers: y.modifiers,
        taxRate: y.taxRate,
        tax: y.tax
      }))
    });
  }

  printKot(guest_book_id: string): Observable<Bill> {
    let item = JSON.parse(JSON.stringify(this.bill));
    let newKot = this.getKot();
    if (newKot.inventories.length == 0) {
      this.toaster.show('Error', 'Cannot print a blank KOT\nPlease add some products!');
    }
    item.kots.push(newKot);
    return this.ser.saveOrUpdate(item, PrintType.Kot, guest_book_id, true).pipe(
      tap(x => console.log(x))
    );
  }

  printBill(guest_book_id: string): Observable<Bill> {
    let item = JSON.parse(JSON.stringify(this.bill));
    item.kots.forEach(k => {
      k.inventories.forEach(i => {
        i.discount = this.data.find(x => !x.isKot && x.id === i.id).discount;
      })
    });
    console.log(item);
    item.kots.push(this.getKot());
    return this.ser.saveOrUpdate(item, PrintType.Bill, guest_book_id, true).pipe(
      tap(x => console.log(x))
    );
  }

}