import { COMMA, ENTER } from '@angular/cdk/keycodes';
import { AsyncPipe, CurrencyPipe } from '@angular/common';
import { AfterViewInit, Component, ElementRef, OnInit, ViewChild, HostListener } from '@angular/core';
import { FormControl, FormGroup, ReactiveFormsModule } from '@angular/forms';
import { MatAutocompleteSelectedEvent, MatAutocompleteTrigger, MatAutocomplete } from '@angular/material/autocomplete';
import { MatButton, MatIconButton } from '@angular/material/button';
import {
  MatCard,
  MatCardHeader,
  MatCardTitleGroup,
  MatCardTitle,
  MatCardContent,
  MatCardActions,
} from '@angular/material/card';
import { MatChipInputEvent, MatChipGrid, MatChipRow, MatChipRemove, MatChipInput } from '@angular/material/chips';
import { MatOption } from '@angular/material/core';
import { MatDatepickerInput, MatDatepickerToggle, MatDatepicker } from '@angular/material/datepicker';
import { MatDialog } from '@angular/material/dialog';
import { MatSuffix, MatFormField, MatLabel, MatPrefix, MatHint } from '@angular/material/form-field';
import { MatIcon } from '@angular/material/icon';
import { MatInput } from '@angular/material/input';
import { MatSelect } from '@angular/material/select';
import { MatSort } from '@angular/material/sort';
import {
  MatTable,
  MatColumnDef,
  MatHeaderCellDef,
  MatHeaderCell,
  MatCellDef,
  MatCell,
  MatHeaderRowDef,
  MatHeaderRow,
  MatRowDef,
  MatRow,
} from '@angular/material/table';
import { ActivatedRoute, Router } from '@angular/router';
import { round } from 'mathjs';
import moment from 'moment';
import { BehaviorSubject, Observable, of as observableOf } from 'rxjs';
import { debounceTime, distinctUntilChanged, map, switchMap } from 'rxjs/operators';

import { AuthService } from '../auth/auth.service';
import { Account } from '../core/account';
import { AccountBalance } from '../core/account-balance';
import { AccountService } from '../core/account.service';
import { DbFile } from '../core/db-file';
import { Journal } from '../core/journal';
import { Tag } from '../tag/tag';
import { TagService } from '../tag/tag.service';
import { MatSnackBar } from '@angular/material/snack-bar';
import { User } from '../core/user';
import { Voucher } from '../core/voucher';
import { VoucherService } from '../core/voucher.service';
import { AccountingPipe } from '../shared/accounting.pipe';
import { ConfirmDialogComponent } from '../shared/confirm-dialog/confirm-dialog.component';
import { ImageDialogComponent } from '../shared/image-dialog/image-dialog.component';
import { ImageService } from '../shared/image.service';
import { LocalTimePipe } from '../shared/local-time.pipe';
import { MathService } from '../shared/math.service';

import { PaymentDataSource } from './payment-datasource';
import { PaymentDialogComponent } from './payment-dialog.component';

@Component({
  selector: 'app-payment',
  templateUrl: './payment.component.html',
  styleUrls: ['./payment.component.css'],
  standalone: true,
  imports: [
    MatCard,
    MatCardHeader,
    MatCardTitleGroup,
    MatCardTitle,
    MatIcon,
    MatSuffix,
    MatCardContent,
    ReactiveFormsModule,
    MatFormField,
    MatLabel,
    MatInput,
    MatDatepickerInput,
    MatDatepickerToggle,
    MatDatepicker,
    MatSelect,
    MatOption,
    MatPrefix,
    MatAutocompleteTrigger,
    MatHint,
    MatAutocomplete,
    MatButton,
    MatTable,
    MatSort,
    MatColumnDef,
    MatHeaderCellDef,
    MatHeaderCell,
    MatCellDef,
    MatCell,
    MatIconButton,
    MatHeaderRowDef,
    MatHeaderRow,
    MatRowDef,
    MatRow,
    MatChipGrid,
    MatChipRow,
    MatChipRemove,
    MatChipInput,
    MatCardActions,
    AsyncPipe,
    CurrencyPipe,
    AccountingPipe,
    LocalTimePipe,
  ],
})
export class PaymentComponent implements OnInit, AfterViewInit {
  @ViewChild('accountElement', { static: true }) accountElement!: ElementRef<HTMLInputElement>;
  @ViewChild('dateElement', { static: true }) dateElement!: ElementRef<HTMLInputElement>;
  @ViewChild('tagInput') tagInput?: ElementRef<HTMLInputElement>;

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

  @HostListener('window:keydown.control.s', ['$event'])
  saveListner(event: KeyboardEvent) {
    event.preventDefault();
    if (this.canSave()) {
      this.save();
    }
  }

  @HostListener('window:keydown.control.p', ['$event'])
  postListner(event: KeyboardEvent) {
    event.preventDefault();
    if (this.voucher.id && !this.voucher.posted && this.auth.allowed('post-vouchers')) {
      this.post();
    }
  }

  separatorKeysCodes: number[] = [ENTER, COMMA];
  public journalObservable = new BehaviorSubject<Journal[]>([]);
  dataSource: PaymentDataSource = new PaymentDataSource(this.journalObservable);
  form: FormGroup<{
    date: FormControl<Date>;
    paymentAccount: FormControl<string>;
    paymentAmount: FormControl<number>;
    addRow: FormGroup<{
      account: FormControl<string | null>;
      amount: FormControl<string>;
    }>;
    narration: FormControl<string>;
    tags: FormControl<string | null>;
  }>;

  paymentAccounts: Account[] = [];
  paymentJournal: Journal = new Journal();
  voucher: Voucher = new Voucher();
  account: Account | null;
  accBal: AccountBalance | null = null;

  displayedColumns = ['account', 'amount', 'action'];

  accounts: Observable<Account[]>;
  tags: Observable<Tag[]>;

  constructor(
    private route: ActivatedRoute,
    private router: Router,
    private dialog: MatDialog,
    private snackBar: MatSnackBar,
    public auth: AuthService,
    private math: MathService,
    public image: ImageService,
    private ser: VoucherService,
    private accountSer: AccountService,
    private tagSer: TagService,
  ) {
    this.account = null;
    this.form = new FormGroup({
      date: new FormControl(new Date(), { nonNullable: true }),
      paymentAccount: new FormControl('', { nonNullable: true }),
      paymentAmount: new FormControl({ value: 0, disabled: true }, { nonNullable: true }),
      addRow: new FormGroup({
        account: new FormControl(''),
        amount: new FormControl('', { nonNullable: true }),
      }),
      narration: new FormControl('', { nonNullable: true }),
      tags: new FormControl(''),
    });
    this.accBal = null;
    // Listen to Account Autocomplete Change
    this.accounts = this.form.controls.addRow.controls.account.valueChanges.pipe(
      debounceTime(150),
      distinctUntilChanged(),
      switchMap((x) => (x === null ? observableOf([]) : this.accountSer.autocomplete(x))),
    );
    this.tags = this.form.controls.tags.valueChanges.pipe(
      debounceTime(150),
      distinctUntilChanged(),
      map((tag: string | Tag | null) => (tag === null ? '' : typeof tag !== 'string' ? tag.name.toLowerCase() : tag)),
      switchMap((tag: string) => this.tagSer.autocomplete(tag)),
    );
    // Listen to Payment Account Change
    this.form.controls.paymentAccount.valueChanges.subscribe((x) =>
      this.router.navigate([], {
        relativeTo: this.route,
        queryParams: { a: x },
        replaceUrl: true,
      }),
    );
  }

  ngOnInit() {
    this.route.data.subscribe((value) => {
      const data = value as { voucher: Voucher; paymentAccounts: Account[] };

      this.paymentAccounts = data.paymentAccounts;
      this.loadVoucher(data.voucher);
    });
  }

  ngAfterViewInit() {
    this.focusAccount();
  }

  loadVoucher(voucher: Voucher) {
    this.voucher = voucher;
    [this.paymentJournal] = this.voucher.journals.filter((x) => x.debit === -1);
    this.form.setValue({
      date: moment(this.voucher.date, 'DD-MMM-YYYY').toDate(),
      paymentAccount: this.paymentJournal.account.id ?? '',
      paymentAmount: this.paymentJournal.amount,
      addRow: {
        account: '',
        amount: '',
      },
      narration: this.voucher.narration,
      tags: '',
    });
    this.dataSource = new PaymentDataSource(this.journalObservable);
    this.updateView();
  }

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

  addRow() {
    const amount = this.math.parseAmount(this.form.value.addRow?.amount ?? '0', 2);
    const debit = 1;
    if (this.account === null || amount <= 0) {
      return;
    }
    const oldFiltered = this.voucher.journals.filter((x) => x.account.id === (this.account as Account).id);
    const old = oldFiltered.length ? oldFiltered[0] : null;
    if (old && (old.debit === -1 || old.id === this.paymentJournal.id)) {
      return;
    }
    if (old) {
      old.amount += amount;
    } else {
      this.voucher.journals.push(
        new Journal({
          debit,
          amount,
          account: this.account,
          costCentre: null,
        }),
      );
    }
    this.resetAddRow();
    this.updateView();
  }

  resetAddRow() {
    this.form.controls.addRow.reset({ account: null, amount: '' });
    this.account = null;
    this.accBal = null;
    setTimeout(() => {
      this.accountElement.nativeElement.focus();
    }, 0);
  }

  updateView() {
    const journals = this.voucher.journals.filter((x) => x.debit === 1);
    this.journalObservable.next(journals);
    this.paymentJournal.amount = round(Math.abs(journals.map((x) => x.amount).reduce((p, c) => p + c, 0)), 2);
    this.form.controls.paymentAmount.setValue(this.paymentJournal.amount);
  }

  editRow(row: Journal) {
    const dialogRef = this.dialog.open(PaymentDialogComponent, {
      width: '750px',
      data: {
        journal: { ...row },
        date: moment(this.form.value.date).format('DD-MMM-YYYY'),
      },
    });

    dialogRef.afterClosed().subscribe((result: boolean | Journal) => {
      if (!result) {
        return;
      }
      const j = result as Journal;
      if (
        j.account.id !== row.account.id &&
        this.voucher.journals.filter((x) => x.account.id === j.account.id).length
      ) {
        return;
      }
      Object.assign(row, j);
      this.updateView();
    });
  }

  deleteRow(row: Journal) {
    this.voucher.journals.splice(this.voucher.journals.indexOf(row), 1);
    this.updateView();
  }

  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) => {
        this.loadVoucher(result);
        this.snackBar.open('Voucher Posted', 'Success');
      },
      error: (error) => {
        this.snackBar.open(error, 'Danger');
      },
    });
  }

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

  getVoucher(): Voucher {
    const formModel = this.form.value;
    this.voucher.date = moment(formModel.date).format('DD-MMM-YYYY');
    this.paymentJournal.account.id = formModel.paymentAccount;
    this.voucher.narration = formModel.narration ?? '';
    return this.voucher;
  }

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

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

  accountSelected(event: MatAutocompleteSelectedEvent): void {
    const account = event.option.value;
    this.account = account;
    const date = moment(this.form.value.date).format('DD-MMM-YYYY');
    this.accountSer.balance(account.id as string, date).subscribe((v) => {
      this.accBal = v;
    });
  }

  zoomImage(file: DbFile) {
    this.dialog.open(ImageDialogComponent, {
      width: '750px',
      data: file.resized,
    });
  }

  deleteImage(file: DbFile) {
    const index = this.voucher.files.indexOf(file);
    this.voucher.files.splice(index, 1);
  }

  removeTag(tag: Tag): void {
    const index = this.voucher.tags.indexOf(tag);

    if (index >= 0) {
      this.voucher.tags.splice(index, 1);
    }
  }

  addTag(event: MatChipInputEvent): void {
    const value = (event.value || '').trim();

    // Add our tag
    if (value) {
      this.voucher.tags.push(new Tag({ name: value }));
    }

    // Clear the input value
    event.chipInput!.clear();

    this.form.controls.tags.setValue(null);
  }

  selectedTag(event: MatAutocompleteSelectedEvent): void {
    const tag = event.option.value as Tag;
    const index = this.voucher.tags.findIndex((t) => (tag.id === null ? t.name === tag.name : t.id === tag.id));
    if (index === -1) {
      this.voucher.tags.push(tag);
    }
    if (this.tagInput) {
      this.tagInput.nativeElement.value = '';
    }
    this.form.controls.tags.setValue(null);
  }
}