import { Component, OnInit } from '@angular/core';
import {User} from '../../models/User';
import { UsersService } from '../../services/users.service';
import { Need } from '../../models/Need';
import { NeedListComponent } from '../need-list/need-list.component';
import { Router } from '@angular/router';

@Component({
  selector: 'app-funding-basket',
  standalone: false,
  templateUrl: './funding-basket.component.html',
  styleUrl: './funding-basket.component.css'
})
export class FundingBasketComponent implements
  OnInit {
  user!: User;
  basket: Need[] = [];
  needCount = 0;
  need_quantity: {[key: number]: number} = {};

  constructor(
    private router: Router,
      private usersService: UsersService
  ) {}
    
  ngOnInit(): void {
    if (!this.usersService.getCurrentUser()) {
      this.router.navigate(['/login'], {queryParams: {redir: this.router.url}});
      return;
    }
    this.usersService.getCurrentUser()?.subscribe(user => {
      this.user = user;
      this.getBasketNeeds();
    });
  }

  getBasketNeeds(): void {
    if (this.user && this.user.cupboard) {
      this.user.cupboard.forEach(need => {
        if (this.isInBasket(need)){
          this.basket.push(need);
        }
      });
    }
  }

  isInBasket(need: Need): boolean {
    return this.basket.some(n => n.id == need.id);
  }
  
  addNeed(need: Need, quantity: number=1): void {
    if (this.user && !this.isInBasket(need)) {
      this.basket.push(need);
      this.need_quantity[need.id] = quantity;
    } if (this.isInBasket(need)) {
        this.need_quantity[need.id] += quantity;
    }
      this.needCount++;
    }
  
  removeNeed(need: Need, quantity:number=1): void {
    if (this.user && this.isInBasket(need)) {
      this.need_quantity[need.id] -= quantity;
      if (this.need_quantity[need.id] === 0) {
        this.basket = this.basket.filter(n => need.id !== n.id);
      }
      this.needCount--;
    }
  }

  removeAllNeeds(): void {
    this.basket.forEach(need => {
      this.need_quantity = [];
    });
    this.basket = [];
    this.needCount = 0;
  }

  isBasketEmpty(): boolean {
    return this.needCount === 0;
  }

  checkout(): void {
    this.removeAllNeeds();
  }
}