import { AsyncPipe, CurrencyPipe } from '@angular/common';
import { AfterViewInit, Component, ElementRef, HostListener, inject, OnInit, ViewChild } from '@angular/core';
import { FormControl, FormGroup, ReactiveFormsModule } from '@angular/forms';
import { MatAutocompleteModule, MatAutocompleteSelectedEvent } from '@angular/material/autocomplete';
import { MatButtonModule } from '@angular/material/button';
import { MatOptionModule } from '@angular/material/core';
import { MatDatepickerModule } from '@angular/material/datepicker';
import { MatDialog } from '@angular/material/dialog';
import { MatFormFieldModule } from '@angular/material/form-field';
import { MatIconModule } from '@angular/material/icon';
import { MatInputModule } from '@angular/material/input';
import { MatSnackBar } from '@angular/material/snack-bar';
import { MatSortModule } from '@angular/material/sort';
import { MatTableModule } from '@angular/material/table';
import { ActivatedRoute, Router } from '@angular/router';
import moment from 'moment';
import { BehaviorSubject, Observable, of as observableOf } from 'rxjs';
import { debounceTime, distinctUntilChanged, switchMap } from 'rxjs/operators';

import { Account } from '../../core/account';
import { AccountService } from '../../core/account.service';
import { Product } from '../../core/product';
import { ProductSku } from '../../core/product-sku';
import { ProductService } from '../../product/product.service';
import { ConfirmDialogComponent } from '../../shared/confirm-dialog/confirm-dialog.component';
import { MathService } from '../../shared/math.service';
import { RateContract } from '../rate-contract';
import { RateContractItem } from '../rate-contract-item';
import { RateContractService } from '../rate-contract.service';
import { RateContractDetailDatasource } from './rate-contract-detail-datasource';

@Component({
  selector: 'app-rate-contract-detail',
  templateUrl: './rate-contract-detail.component.html',
  styleUrls: ['./rate-contract-detail.component.css'],
  imports: [
    ReactiveFormsModule,
    MatFormFieldModule,
    MatInputModule,
    MatDatepickerModule,
    MatAutocompleteModule,
    MatOptionModule,
    MatButtonModule,
    MatTableModule,
    MatSortModule,
    MatIconModule,
    AsyncPipe,
    CurrencyPipe,
  ],
})
export class RateContractDetailComponent implements OnInit, AfterViewInit {
  private route = inject(ActivatedRoute);
  private router = inject(Router);
  private snackBar = inject(MatSnackBar);
  private dialog = inject(MatDialog);
  private math = inject(MathService);
  private ser = inject(RateContractService);
  private productSer = inject(ProductService);
  private accountSer = inject(AccountService);

  @ViewChild('accountElement', { static: true }) accountElement!: ElementRef<HTMLInputElement>;
  @ViewChild('productElement', { static: true }) productElement!: ElementRef<HTMLInputElement>;
  @ViewChild('dateElement', { static: true }) dateElement!: ElementRef<HTMLInputElement>;
  public itemsObservable = new BehaviorSubject<RateContractItem[]>([]);
  dataSource: RateContractDetailDatasource = new RateContractDetailDatasource(this.itemsObservable);
  form: FormGroup<{
    date: FormControl<moment.Moment>;
    account: FormControl<string | null>;
    validFrom: FormControl<moment.Moment>;
    validTill: FormControl<moment.Moment>;
    addRow: FormGroup<{
      product: FormControl<string | null>;
      price: FormControl<string>;
    }>;
    narration: FormControl<string>;
  }>;

  item: RateContract = new RateContract();

  account: Account | null = null;
  product: Product | null = null;

  displayedColumns = ['product', 'price', 'action'];

  accounts: Observable<Account[]>;
  products: Observable<ProductSku[]>;

  @HostListener('window:keydown.f2', ['$event'])
  focusDate(event: Event) {
    event.preventDefault();
    this.dateElement.nativeElement.focus();
    this.dateElement.nativeElement.select();
  }

  constructor() {
    this.form = new FormGroup({
      date: new FormControl(moment(new Date()), { nonNullable: true }),
      account: new FormControl<string | null>(null),
      validFrom: new FormControl(moment(new Date()), { nonNullable: true }),
      validTill: new FormControl(moment(new Date()), { nonNullable: true }),
      addRow: new FormGroup({
        product: new FormControl(''),
        price: new FormControl('', { nonNullable: true }),
      }),
      narration: new FormControl('', { nonNullable: true }),
    });
    this.accounts = this.form.controls.account.valueChanges.pipe(
      debounceTime(150),
      distinctUntilChanged(),
      switchMap((x) => (x === null ? observableOf([]) : this.accountSer.autocomplete(x))),
    );
    // Listen to Product Autocomplete Change
    this.products = this.form.controls.addRow.controls.product.valueChanges.pipe(
      debounceTime(150),
      distinctUntilChanged(),
      switchMap((x) => (x === null ? observableOf([]) : this.productSer.autocompleteSku(x, true))),
    );
  }

  ngOnInit() {
    this.route.data.subscribe((value) => {
      const data = value as { item: RateContract };
      this.loadItem(data.item);
    });
  }

  loadItem(item: RateContract) {
    this.item = item;
    this.form.setValue({
      date: moment(this.item.date, 'DD-MMM-YYYY'),
      validFrom: moment(this.item.validFrom, 'DD-MMM-YYYY'),
      validTill: moment(this.item.validTill, 'DD-MMM-YYYY'),
      account: this.item.vendor?.name ?? '',
      addRow: {
        product: '',
        price: '',
      },
      narration: this.item.narration,
    });
    this.account = this.item.vendor || null;
    this.dataSource = new RateContractDetailDatasource(this.itemsObservable);
    this.updateView();
  }

  ngAfterViewInit() {
    setTimeout(() => {
      this.accountElement.nativeElement.focus();
    }, 0);
  }

  addRow() {
    const formValue = this.form.value.addRow;
    if (formValue === undefined) {
      return;
    }
    const price = this.math.parseAmount(formValue.price, 2);
    if (this.product === null || price <= 0) {
      return;
    }
    const oldFiltered = this.item.items.filter((x) => x.sku.id === (this.product as Product).id);
    if (oldFiltered.length) {
      this.snackBar.open('Product already added', 'Danger');
      return;
    }
    this.item.items.push(
      new RateContractItem({
        price,
        sku: this.product,
      }),
    );
    this.resetAddRow();
    this.updateView();
  }

  resetAddRow() {
    this.form.controls.addRow.reset();
    this.product = null;
    setTimeout(() => {
      this.productElement.nativeElement.focus();
    }, 0);
  }

  displayFn(item?: Account | Product | string): string {
    return !item ? '' : typeof item === 'string' ? item : item.name;
  }

  updateView() {
    this.itemsObservable.next(this.item.items);
  }

  accountSelected(event: MatAutocompleteSelectedEvent): void {
    this.account = event.option.value;
  }

  productSelected(event: MatAutocompleteSelectedEvent): void {
    this.product = event.option.value;
  }

  deleteRow(row: RateContractItem) {
    this.item.items.splice(this.item.items.indexOf(row), 1);
    this.updateView();
  }

  save() {
    this.ser.saveOrUpdate(this.getItem()).subscribe({
      next: () => {
        this.snackBar.open('', 'Success');
        this.router.navigateByUrl('/rate-contracts');
      },
      error: (error) => {
        this.snackBar.open(error, 'Danger');
      },
    });
  }

  delete() {
    this.ser.delete(this.item.id as string).subscribe({
      next: () => {
        this.snackBar.open('', 'Success');
        this.router.navigateByUrl('/rate-contracts');
      },
      error: (error) => {
        this.snackBar.open(error, 'Danger');
      },
    });
  }

  confirmDelete(): void {
    const dialogRef = this.dialog.open(ConfirmDialogComponent, {
      width: '250px',
      data: { title: 'Delete RateContract?', content: 'Are you sure? This cannot be undone.' },
    });

    dialogRef.afterClosed().subscribe((result: boolean) => {
      if (result) {
        this.delete();
      }
    });
  }

  getItem(): RateContract {
    const formModel = this.form.value;
    this.item.date = moment(formModel.date).format('DD-MMM-YYYY');
    this.item.validFrom = moment(formModel.validFrom).format('DD-MMM-YYYY');
    this.item.validTill = moment(formModel.validTill).format('DD-MMM-YYYY');
    this.item.vendor = this.account ?? new Account();
    this.item.narration = formModel.narration ?? '';
    return this.item;
  }
}