/**
 * Copyright since 2025 Mifos Initiative
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 */

import { Injectable, inject } from '@angular/core';
import { HttpClient, HttpHeaders } from '@angular/common/http';
import { Observable } from 'rxjs';

export interface OtpGenerateResponse {
  success: boolean;
  otpId?: number;
  otpReference?: string;
  message?: string;
}

export interface OtpVerifyResponse {
  verified: boolean;
  message?: string;
}

export type MfaFactorType = 'SMS' | 'EMAIL' | 'TOTP' | 'TOKEN';

export interface MfaFactor {
  id?: number;
  factorType: MfaFactorType;
  destination?: string;
  secret?: string;
  serial?: string;
  verified: boolean;
  verifiedOn?: string;
  otpLogId?: number;
}

/**
 * Wraps the login-OTP endpoints (LincPay SMS + SMTP email) plus the
 * MFA-factor persistence endpoints used by Access Control.
 */
@Injectable({ providedIn: 'root' })
export class AccessControlService {
  private http = inject(HttpClient);

  // ───── Mobile OTP (LincPay) ─────
  sendMobileOtp(username: string): Observable<OtpGenerateResponse> {
    return this.http.post<OtpGenerateResponse>('/login/otp/generate', { username });
  }

  verifyMobileOtp(otpId: number, otp: string): Observable<OtpVerifyResponse> {
    return this.http.post<OtpVerifyResponse>('/login/otp/verify', { otpId, otp });
  }

  // ───── Email OTP (SMTP) ─────
  sendEmailOtp(username: string): Observable<OtpGenerateResponse> {
    return this.http.post<OtpGenerateResponse>('/login/otp/email/generate', { username });
  }

  verifyEmailOtp(otpId: number, otp: string): Observable<OtpVerifyResponse> {
    return this.http.post<OtpVerifyResponse>('/login/otp/email/verify', { otpId, otp });
  }

  // ───── MFA factors persistence (NEW backend endpoints) ─────
  /**
   * Marker header that tells our Fineract security filter to return a plain
   * 401 (no `WWW-Authenticate: Basic`) so the browser doesn't pop up its
   * native Basic-Auth dialog when the endpoint isn't wired up yet.
   */
  private silentHeaders = new HttpHeaders({ 'X-Requested-With': 'XMLHttpRequest' });

  /** List the signed-in user's MFA factors. */
  listMyFactors(): Observable<MfaFactor[]> {
    return this.http.get<MfaFactor[]>('/mfa/factors', { headers: this.silentHeaders });
  }

  /**
   * Persist a verified factor. Backend should set `verified=true`,
   * `verified_on=NOW()`, and link to the matching `m_otp_log` row.
   */
  saveFactor(payload: {
    factorType: MfaFactorType;
    destination?: string;
    secret?: string;
    serial?: string;
    otpId?: number;
  }): Observable<MfaFactor> {
    return this.http.post<MfaFactor>('/mfa/factors', payload, { headers: this.silentHeaders });
  }

  /** Disable a factor (logical delete — sets `disabled_on`). */
  disableFactor(factorId: number): Observable<{ resourceId: number }> {
    return this.http.delete<{ resourceId: number }>(`/mfa/factors/${factorId}`, {
      headers: this.silentHeaders
    });
  }
}