import { Component, ElementRef, Inject, ViewChild } from '@angular/core';
import { FormArray, FormControl, FormGroup } from '@angular/forms';
import { MAT_DIALOG_DATA, MatDialogRef } from '@angular/material/dialog';
import { distinctUntilChanged, map, tap } from 'rxjs/operators';

import { ReceivePaymentItem } from '../../core/receive-payment-item';
import { SettleOption } from '../../core/settle-option';
import { SettleOptionService } from '../../settle-option/settle-option.service';
import { VoucherType } from '../bills/voucher-type';

import { ReceivePaymentDatasource } from './receive-payment-datasource';

@Component({
  selector: 'app-receive-payment',
  templateUrl: './receive-payment.component.html',
  styleUrls: ['./receive-payment.component.css'],
})
export class ReceivePaymentComponent {
  @ViewChild('son', { static: true }) son?: ElementRef;
  choices: ReceivePaymentItem[] = [];

  type: VoucherType;
  amount: number;
  balance: number;
  reason = '';
  displayReason: boolean;
  displayTable: boolean;
  form: FormGroup<{
    amounts: FormArray<
      FormGroup<{
        name: FormControl<string>;
        amount: FormControl<number>;
      }>
    >;
    son: FormControl<string>;
  }>;

  dataSource: ReceivePaymentDatasource;

  displayedColumns = ['name', 'amount'];

  constructor(
    public dialogRef: MatDialogRef<ReceivePaymentComponent>,
    private ser: SettleOptionService,
    @Inject(MAT_DIALOG_DATA) public data: { type: VoucherType; amount: number },
  ) {
    this.form = new FormGroup({
      amounts: new FormArray<
        FormGroup<{
          name: FormControl<string>;
          amount: FormControl<number>;
        }>
      >([]),
      son: new FormControl<string>('', { nonNullable: true }),
    });
    this.type = data.type;
    this.amount = data.amount;
    this.balance = data.amount;
    this.displayReason = false;
    this.displayTable = false;
    this.ser
      .listForType(data.type)
      .pipe(
        tap((x: SettleOption[]) => (this.displayReason = x.reduce((o, n) => o || n.hasReason, this.displayReason))),
        tap((x: SettleOption[]) => (this.displayTable = x.length > 1)),
        map((x: SettleOption[]) =>
          x.map((y) => ({ ...y, amount: !this.displayTable ? this.amount : 0 } as ReceivePaymentItem)),
        ),
      )
      .subscribe((x) => {
        this.choices = x;
        this.form.controls.amounts.clear();
        this.choices.forEach((y: ReceivePaymentItem) =>
          this.form.controls.amounts.push(
            new FormGroup({
              name: new FormControl<string>(y.name, { nonNullable: true }),
              amount: new FormControl<number>(y.amount === 0 ? 0 : this.amount, {
                nonNullable: true,
              }),
            }),
          ),
        );
        this.dataSource = new ReceivePaymentDatasource(this.choices);
        this.listenToAmountChange();
        this.balance = this.amount - this.choices.reduce((a, c) => a + c.amount, 0);
      });
    this.dataSource = new ReceivePaymentDatasource(this.choices);
    this.listenToAmountChange();
  }

  listenToAmountChange() {
    const array = this.form.controls.amounts;
    this.choices.forEach((z, i) =>
      array.controls[i].valueChanges.pipe(distinctUntilChanged()).subscribe((x) => {
        (this.choices.find((s) => s.name === x.name) as ReceivePaymentItem).amount = x.amount ?? 0;
        this.balance = this.amount - this.choices.reduce((a, c) => a + c.amount, 0);
      }),
    );
  }

  select(reason: string) {
    this.reason = reason.trim();
    return true;
  }

  accept(): void {
    this.dialogRef.close({ choices: this.choices, reason: this.reason });
  }

  maxAmount(row: ReceivePaymentItem, index: number) {
    const array = this.form.controls.amounts;
    const ctrl = array.controls[index].controls.amount;
    ctrl.setValue(row.amount + this.balance);
  }
}