import { Component, OnInit } from '@angular/core';
import { FormArray, FormBuilder, FormGroup } from '@angular/forms';
import { MatDialog } from '@angular/material/dialog';
import { ActivatedRoute, Router } from '@angular/router';
import * as moment from 'moment';
import { BehaviorSubject, Observable } from 'rxjs';
import { map } from 'rxjs/operators';

import { AuthService } from '../auth/auth.service';
import { Account } from '../core/account';
import { Incentive } from '../core/incentive';
import { ToasterService } from '../core/toaster.service';
import { Voucher } from '../core/voucher';
import { VoucherService } from '../core/voucher.service';
import { ConfirmDialogComponent } from '../shared/confirm-dialog/confirm-dialog.component';

import { IncentiveDataSource } from './incentive-datasource';

@Component({
  selector: 'app-incentive',
  templateUrl: './incentive.component.html',
  styleUrls: ['./incentive.component.css'],
})
export class IncentiveComponent implements OnInit {
  public incentiveObservable = new BehaviorSubject<Incentive[]>([]);
  dataSource: IncentiveDataSource;
  form: FormGroup;
  voucher: Voucher;
  account: Account;
  accBal: any;

  displayedColumns = ['name', 'designation', 'department', 'daysWorked', 'points', 'amount'];

  accounts: Observable<Account[]>;

  constructor(
    private route: ActivatedRoute,
    private router: Router,
    private fb: FormBuilder,
    private dialog: MatDialog,
    private toaster: ToasterService,
    public auth: AuthService,
    private ser: VoucherService,
  ) {
    this.createForm();
    this.listenToDateChange();
  }

  ngOnInit() {
    this.route.data.subscribe((data: { voucher: Voucher }) => {
      this.loadVoucher(data.voucher);
    });
  }

  loadVoucher(voucher) {
    this.voucher = voucher;
    this.form.get('date').setValue(moment(this.voucher.date, 'DD-MMM-YYYY').toDate());
    this.form.setControl(
      'incentives',
      this.fb.array(
        this.voucher.incentives.map((x) =>
          this.fb.group({
            points: x.points,
          }),
        ),
      ),
    );
    this.dataSource = new IncentiveDataSource(this.incentiveObservable);
    this.incentiveObservable.next(this.voucher.incentives);
  }

  createForm() {
    this.form = this.fb.group({
      date: '',
      incentives: this.fb.array([]),
    });
  }

  listenToDateChange(): void {
    this.form
      .get('date')
      .valueChanges.pipe(map((x) => moment(x).format('DD-MMM-YYYY')))
      .subscribe((x) => {
        if (x !== this.voucher.date && !this.voucher.id) {
          return this.ser.getIncentive(x).subscribe((voucher: Voucher) => {
            this.loadVoucher(voucher);
          });
        }
        return '';
      });
  }

  totalPoints() {
    return this.voucher.incentives
      .map((item) => item.daysWorked * item.points)
      .reduce((sum, item) => sum + item);
  }

  pointValue() {
    return Math.round((this.voucher.incentive * 100) / this.totalPoints()) / 100;
  }

  less(row: Incentive, i: number) {
    if (row.points >= 1) {
      row.points -= 1;
      this.form
        .get('incentives')
        .get(`${i}`)
        .setValue({ points: `${row.points}` });
    }
  }

  change(row: Incentive, i: number) {
    row.points = +this.form.get('incentives').get(`${i}`).get('points').value;
    this.form
      .get('incentives')
      .get(`${i}`)
      .setValue({ points: `${row.points}` });
  }

  more(row: Incentive, i: number) {
    row.points += 1;
    this.form
      .get('incentives')
      .get(`${i}`)
      .setValue({ points: `${row.points}` });
  }

  amount(row) {
    return row.points * row.daysWorked * this.pointValue();
  }

  canSave() {
    if (!this.voucher.id) {
      return true;
    }
    if (this.voucher.posted && this.auth.user.perms.indexOf('edit-posted-vouchers') !== -1) {
      return true;
    }
    return (
      this.voucher.user.id === this.auth.user.id ||
      this.auth.user.perms.indexOf("edit-other-user's-vouchers") !== -1
    );
  }

  post() {
    this.ser.post(this.voucher.id).subscribe(
      (result) => {
        this.loadVoucher(result);
        this.toaster.show('Success', 'Voucher Posted');
      },
      (error) => {
        this.toaster.show('Danger', error);
      },
    );
  }

  save() {
    const voucher: Voucher = this.getVoucher();
    this.ser.saveOrUpdate(voucher).subscribe(
      (result) => {
        if (voucher.id === result.id) {
          this.loadVoucher(result);
        } else {
          this.router.navigate(['/incentive', result.id]);
        }
      },
      (error) => {
        this.toaster.show('Danger', error);
      },
    );
  }

  getVoucher(): Voucher {
    const formModel = this.form.value;
    this.voucher.date = moment(formModel.date).format('DD-MMM-YYYY');
    const array = this.form.get('incentives') as FormArray;
    this.voucher.incentives.forEach((item, index) => {
      item.points = array.controls[index].value.points;
    });
    return this.voucher;
  }

  delete() {
    this.ser.delete(this.voucher.id).subscribe(
      () => {
        this.toaster.show('Success', '');
        this.router.navigate(['/incentive'], { replaceUrl: true });
      },
      (error) => {
        this.toaster.show('Danger', error);
      },
    );
  }

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

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