import { CurrencyPipe, DecimalPipe } from '@angular/common';
import { signal, Component, inject, input, computed, linkedSignal } from '@angular/core';
import { form as createForm, FormField, FormRoot } from '@angular/forms/signals';
import { MatButtonModule } from '@angular/material/button';
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 { MatTableModule } from '@angular/material/table';
import { Router } from '@angular/router';
import moment from 'moment';

import { AuthService } from '../auth/auth.service';
import { Account } from '../core/account';
import { AccountBalance } from '../core/account-balance';
import { Incentive } from '../core/incentive';
import { User } from '../core/user';
import { Voucher } from '../core/voucher';
import { VoucherService } from '../core/voucher.service';
import { ConfirmDialogComponent } from '../shared/confirm-dialog/confirm-dialog.component';
import { LocalTimePipe } from '../shared/local-time.pipe';

export interface IncentiveFormData {
  date: Date;
  incentives: { points: number }[];
}

@Component({
  selector: 'app-incentive',
  templateUrl: './incentive.component.html',
  styleUrls: ['./incentive.component.css'],
  host: {
    '(window:keydown.f2)': 'focusDate($event)',
  },
  imports: [
    FormField,
    FormRoot,
    MatFormFieldModule,
    MatInputModule,
    MatDatepickerModule,
    MatTableModule,
    MatIconModule,
    MatButtonModule,
    DecimalPipe,
    CurrencyPipe,
    LocalTimePipe,
  ],
})
export class IncentiveComponent {
  private router = inject(Router);
  private dialog = inject(MatDialog);
  private snackBar = inject(MatSnackBar);
  auth = inject(AuthService);
  private ser = inject(VoucherService);
  id = input(null, { transform: (v: string | null | undefined) => v ?? null });
  voucherResource = this.ser.getVoucher(this.id, signal('Incentive'), signal(null), signal(null));
  voucher = computed(() => this.voucherResource.value() ?? new Voucher());
  model = linkedSignal({
    source: this.voucher,
    computation: (v): IncentiveFormData => ({
      date: moment(v.date, 'DD-MMM-YYYY').toDate(),
      incentives: v.incentives.map((x) => ({ points: x.points })),
    }),
  });

  form = createForm(this.model);

  incentives = linkedSignal(() => this.voucher().incentives);

  account: Account = new Account();
  accBal: AccountBalance | null = null;

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

  focusDate(event: Event) {
    event.preventDefault();
    this.form().focusBoundControl();
  }

  totalPoints = computed(() => {
    return this.incentives()
      .map((item: Incentive, i: number) => item.daysWorked * (this.model().incentives[i]?.points ?? 0))
      .reduce((sum: number, item: number) => sum + item, 0);
  });

  pointValue = computed(() => {
    const tp = this.totalPoints();
    if (!tp) return 0;
    return Math.round(((this.voucher().incentive as number) * 100) / tp) / 100;
  });

  less(i: number) {
    const currentPoints = this.model().incentives[i]?.points ?? 0;
    if (currentPoints >= 1) {
      this.model.update((m) => {
        const arr = [...m.incentives];
        if (arr[i]) {
          arr[i] = { ...arr[i], points: currentPoints - 1 };
        }
        return { ...m, incentives: arr };
      });
    }
  }

  more(i: number) {
    const currentPoints = this.model().incentives[i]?.points ?? 0;
    this.model.update((m) => {
      const arr = [...m.incentives];
      if (arr[i]) {
        arr[i] = { ...arr[i], points: currentPoints + 1 };
      }
      return { ...m, incentives: arr };
    });
  }

  amount(row: Incentive, i: number) {
    const currentPoints = this.model().incentives[i]?.points ?? 0;
    return currentPoints * row.daysWorked * this.pointValue();
  }

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

  post() {
    this.ser.post(this.voucher().id as string).subscribe({
      next: (result: Voucher) => {
        this.snackBar.open('Voucher Posted', 'Success');
        this.router.navigate(['/incentive', (result as Voucher).id], { replaceUrl: true });
      },
      error: (error) => {
        this.snackBar.open(error as string, 'Danger');
      },
    });
  }

  save() {
    const voucher: Voucher = this.getVoucher();
    this.ser.saveOrUpdate(voucher).subscribe({
      next: (result: Voucher) => {
        this.router.navigate(['/incentive', (result as Voucher).id], { replaceUrl: true });
      },
      error: (error) => {
        this.snackBar.open(error as string, 'Danger');
      },
    });
  }

  getVoucher(): Voucher {
    const formModel = this.model();
    const v = this.voucher();
    v.date = moment(formModel.date).format('DD-MMM-YYYY');
    const array = formModel.incentives;

    v.incentives.forEach((item: Incentive, index: number) => {
      item.points = array[index]?.points ?? 0;
    });
    return v;
  }

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

  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();
      }
    });
  }
}