import { Component, inject, signal } from '@angular/core';
import { FormsModule } from '@angular/forms';
import { HttpClient } from '@angular/common/http';

const API_URL = 'https://qr.vitanova.network:567/qr';

@Component({
  selector: 'app-root',
  imports: [FormsModule],
  templateUrl: './app.html',
  styleUrl: './app.scss'
})
export class App {
  private http = inject(HttpClient);

  amount = signal<number>(10);
  error = signal<string>('');
  loading = signal<boolean>(false);

  private get paymentId(): string | null {
    const params = new URLSearchParams(window.location.search);
    return params.get('id');
  }

  goToPayment(): void {
    const val = this.amount();
    if (!val || val <= 0) {
      this.error.set('Введите корректную сумму');
      return;
    }

    const id = this.paymentId;
    if (id === null) {
      this.error.set('Не указан идентификатор платежа (параметр id)');
      return;
    }

    this.error.set('');
    this.loading.set(true);

    this.http.post<{ qrId: string; qrStatus: string; qrExpirationDate: string; payload: string; qrUrl: string }>(API_URL, {
      payment: 'sbp',
      amount: val,
      currency: 'rub',
      id
    }).subscribe({
      next: (res) => {
        this.loading.set(false);
        if (res?.payload) {
          window.location.href = res.payload;
        }
      },
      error: () => {
        this.loading.set(false);
        this.error.set('Ошибка при создании платежа. Попробуйте ещё раз.');
      }
    });
  }

  onAmountChange(value: number): void {
    this.amount.set(value);
    if (value > 0) this.error.set('');
  }
}