import {Component, OnInit} from '@angular/core';
import {FormArray, FormBuilder, FormGroup} from '@angular/forms';
import {MatDialog} from '@angular/material';
import {ActivatedRoute, Router} from '@angular/router';
import {BehaviorSubject, Observable} from 'rxjs';
import {IncentiveDataSource} from './incentive-datasource';
import {Account} from '../account/account';
import {VoucherService} from '../journal/voucher.service';
import {Incentive, Voucher} from '../journal/voucher';
import * as moment from 'moment';
import {AuthService} from '../auth/auth.service';
import {ConfirmDialogComponent} from '../shared/confirm-dialog/confirm-dialog.component';
import {ToasterService} from '../core/toaster.service';
import {map} from 'rxjs/operators';

@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,
    private auth: AuthService,
    private ser: VoucherService
  ) {
    this.createForm();
    this.listenToDateChange();
  }

  ngOnInit() {
    this.route.data
      .subscribe((data: { voucher: Voucher }) => {
        this.voucher = data.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.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(
                i => this.fb.group({
                  points: i.points
                })
              )
            ));
            this.dataSource = new IncentiveDataSource(this.incentiveObservable);
            this.incentiveObservable.next(this.voucher.incentives);
          });
      }
    });
  }

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

  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;
    } else if (this.voucher.posted && this.auth.user.perms.indexOf('Edit Posted Vouchers') !== -1) {
      return true;
    } else {
      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.toaster.show('Success', 'Voucher Posted');
        },
        (error) => {
          this.toaster.show('Danger', error.error);
        }
      );
  }

  save() {
    this.ser.save(this.getVoucher())
      .subscribe(
        (result) => {
          this.toaster.show('Success', '');
          this.router.navigate(['/Incentive', result.id]);
        },
        (error) => {
          this.toaster.show('Danger', error.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;
    });
    this.voucher.narration = formModel.narration;
    return this.voucher;
  }

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