import { Component, OnInit } from '@angular/core';
import { FormArray, FormControl, FormGroup } from '@angular/forms';
import { ActivatedRoute, Router } from '@angular/router';
import * as moment from 'moment';
import { map } from 'rxjs/operators';

import { MenuCategory } from '../core/menu-category';
import { ToasterService } from '../core/toaster.service';
import { ToCsvService } from '../shared/to-csv.service';

import { UpdateProductPrices } from './update-product-prices';
import { UpdateProductPricesDataSource } from './update-product-prices-datasource';
import { UpdateProductPricesService } from './update-product-prices.service';

@Component({
  selector: 'app-update-product-prices',
  templateUrl: './update-product-prices.component.html',
  styleUrls: ['./update-product-prices.component.css'],
})
export class UpdateProductPricesComponent implements OnInit {
  info: UpdateProductPrices = new UpdateProductPrices();
  dataSource: UpdateProductPricesDataSource = new UpdateProductPricesDataSource(this.info.items);
  form: FormGroup<{
    date: FormControl<Date>;
    menuCategory: FormControl<string>;
    prices: FormArray<
      FormGroup<{
        newPrice: FormControl<number | null>;
      }>
    >;
  }>;

  menuCategories: MenuCategory[] = [];

  /** Columns displayed in the table. Columns IDs can be added, removed, or reordered. */
  displayedColumns = ['name', 'oldPrice', 'newPrice'];

  constructor(
    private route: ActivatedRoute,
    private router: Router,
    private toCsv: ToCsvService,
    private toaster: ToasterService,
    private ser: UpdateProductPricesService,
  ) {
    // Create form
    this.form = new FormGroup({
      date: new FormControl(new Date(), { nonNullable: true }),
      menuCategory: new FormControl('', { nonNullable: true }),
      prices: new FormArray<
        FormGroup<{
          newPrice: FormControl<number | null>;
        }>
      >([]),
    });
  }

  ngOnInit() {
    this.route.data
      .pipe(
        map((value) => {
          const data = value as { menuCategories: MenuCategory[]; info: UpdateProductPrices };
          data.menuCategories.unshift(new MenuCategory({ id: undefined, name: '-- All Categories --' }));
          return data;
        }),
      )
      .subscribe((data: { menuCategories: MenuCategory[]; info: UpdateProductPrices }) => {
        this.menuCategories = data.menuCategories;
        this.loadData(data.info);
      });
  }

  loadData(info: UpdateProductPrices) {
    this.info = info;
    this.form.controls.date.setValue(moment(this.info.date, 'DD-MMM-YYYY').toDate());
    this.form.controls.menuCategory.setValue(this.info.menuCategoryId !== undefined ? this.info.menuCategoryId : '');
    this.form.controls.prices.clear();

    this.info.items.forEach((x) =>
      this.form.controls.prices.push(
        new FormGroup({
          newPrice: new FormControl<number | null>(x.newPrice),
        }),
      ),
    ),
      (this.dataSource = new UpdateProductPricesDataSource(this.info.items));
  }

  show() {
    const info = this.getInfo();
    const route = ['update-product-prices'];
    if (info.menuCategoryId !== null) {
      route.push(info.menuCategoryId as string);
    }
    this.router.navigate(route, {
      queryParams: {
        date: info.date,
      },
    });
  }

  getInfo(): UpdateProductPrices {
    const formModel = this.form.value;
    const array = this.form.controls.prices;
    this.info.items.forEach((item, index) => {
      item.newPrice = array.controls[index].value.newPrice ?? null;
    });

    return {
      date: moment(formModel.date).format('DD-MMM-YYYY'),
      menuCategoryId: formModel.menuCategory,
      items: [...this.info.items],
    };
  }

  exportCsv() {
    const headers = {
      Details: 'details',
    };
    const csvData = new Blob([this.toCsv.toCsv(headers, this.dataSource.data)], {
      type: 'text/csv;charset=utf-8;',
    });
    const link = document.createElement('a');
    link.href = window.URL.createObjectURL(csvData);
    link.setAttribute('download', 'update-product-prices.csv');
    document.body.appendChild(link);
    link.click();
    document.body.removeChild(link);
  }

  save() {
    this.ser.save(this.getInfo()).subscribe(
      (result: UpdateProductPrices) => {
        this.toaster.show('Success', '');
        this.loadData(result);
      },
      (error) => {
        this.toaster.show('Error', error);
      },
    );
  }
}