/**
 * SaaS Auth Methods — Mixin
 *
 * Installs authentication-related methods onto SaaSClient.prototype.
 * Uses the same mixin pattern as gateway-api.ts.
 */

import type {
  SaaSAccountInfo,
  SaaSLoginResponse,
  SaaSRefreshResponse,
  TotpSetupResponse,
  TotpResultResponse,
} from './saas-types';

export function installAuthMethods(ClientClass: { prototype: any }): void {
  const proto = ClientClass.prototype;

  /**
   * Login with username and password.
   * Auto-sets the client token on success.
   */
  proto.login = async function (this: { token: string | null; refreshTokenValue: string | null; request<T>(method: string, path: string, body?: unknown): Promise<T> }, username: string, password: string, totpCode?: string): Promise<SaaSLoginResponse> {
    const body: Record<string, string> = { username, password };
    if (totpCode) body.totp_code = totpCode;    // Clear stale token before login — avoid sending expired token on auth endpoint
    this.token = null;
    const data = await this.request<SaaSLoginResponse>(
      'POST', '/api/v1/auth/login', body,
    );
    this.token = data.token;
    this.refreshTokenValue = data.refresh_token;
    return data;
  };

  /**
   * Register a new account.
   * Auto-sets the client token on success.
   */
  proto.register = async function (this: { token: string | null; refreshTokenValue: string | null; request<T>(method: string, path: string, body?: unknown): Promise<T> }, data: {
    username: string;
    email: string;
    password: string;
    display_name?: string;
  }): Promise<SaaSLoginResponse> {
    // Clear stale token before register
    this.token = null;
    const result = await this.request<SaaSLoginResponse>(
      'POST', '/api/v1/auth/register', data,
    );
    this.token = result.token;
    this.refreshTokenValue = result.refresh_token;
    return result;
  };

  /**
   * Get the current authenticated user's account info.
   */
  proto.me = async function (this: { request<T>(method: string, path: string, body?: unknown): Promise<T> }): Promise<SaaSAccountInfo> {
    return this.request<SaaSAccountInfo>('GET', '/api/v1/auth/me');
  };

  /**
   * Refresh the current token.
   * Auto-updates the client token on success.
   */
  proto.refreshToken = async function (this: { token: string | null; refreshTokenValue: string | null; request<T>(method: string, path: string, body?: unknown): Promise<T> }): Promise<string> {
    if (!this.refreshTokenValue) {
      throw new Error('No refresh token available');
    }
    const data = await this.request<SaaSRefreshResponse>('POST', '/api/v1/auth/refresh', {
      refresh_token: this.refreshTokenValue,
    });
    this.token = data.token;
    if (data.refresh_token) {
      this.refreshTokenValue = data.refresh_token;
    }
    return data.token;
  };

  /**
   * Change the current user's password.
   */
  proto.changePassword = async function (this: { request<T>(method: string, path: string, body?: unknown): Promise<T> }, oldPassword: string, newPassword: string): Promise<void> {
    await this.request<unknown>('PUT', '/api/v1/auth/password', {
      old_password: oldPassword,
      new_password: newPassword,
    });
  };

  // --- TOTP Endpoints ---

  /** Generate a TOTP secret and otpauth URI */
  proto.setupTotp = async function (this: { request<T>(method: string, path: string, body?: unknown): Promise<T> }): Promise<TotpSetupResponse> {
    return this.request<TotpSetupResponse>('POST', '/api/v1/auth/totp/setup');
  };

  /** Verify a TOTP code and enable 2FA */
  proto.verifyTotp = async function (this: { request<T>(method: string, path: string, body?: unknown): Promise<T> }, code: string): Promise<TotpResultResponse> {
    return this.request<TotpResultResponse>('POST', '/api/v1/auth/totp/verify', { code });
  };

  /** Disable 2FA (requires password confirmation) */
  proto.disableTotp = async function (this: { request<T>(method: string, path: string, body?: unknown): Promise<T> }, password: string): Promise<TotpResultResponse> {
    return this.request<TotpResultResponse>('POST', '/api/v1/auth/totp/disable', { password });
  };
}