/**
 * Generated by the Lango developer portal. Do not edit by hand.
 * Group: identity (Identity)
 * APIs: Identity Check v1.1.0
 * Generated: 2026-09-28T10:59:58.104Z
 */

export class LangoApiError extends Error {
  status: number;
  error: string;
  requestId?: string;
  constructor(status: number, error: string, message: string, requestId?: string) {
    super(message);
    this.name = "LangoApiError";
    this.status = status;
    this.error = error;
    this.requestId = requestId;
  }
}

export interface CreateVerificationRequest {
  idType: "NATIONAL_ID" | "PASSPORT" | "ALIEN_ID";
  /** In the sandbox, 00000001 and 00000002 trigger mismatch scenarios. */
  idNumber: string;
  firstName: string;
  lastName: string;
  dateOfBirth?: string;
  phoneNumber?: string;
  /** Your record of the customer's consent. */
  consentReference: string;
}

export class IdentityClient {
  private consumerKey: string;
  private consumerSecret: string;
  private baseUrl: string;
  private token: string | null = null;
  private tokenExpiresAt = 0;

  constructor(consumerKey: string, consumerSecret: string, baseUrl: string) {
    this.consumerKey = consumerKey;
    this.consumerSecret = consumerSecret;
    this.baseUrl = baseUrl.replace(/\/+$/, "");
  }

  private async getToken(): Promise<string> {
    if (this.token && Date.now() < this.tokenExpiresAt) return this.token;
    const basic = btoa(`${this.consumerKey}:${this.consumerSecret}`);
    const res = await fetch(`${this.baseUrl}/oauth/v1/token`, {
      method: "POST",
      headers: { authorization: `Basic ${basic}`, "content-type": "application/x-www-form-urlencoded" },
      body: "grant_type=client_credentials",
    });
    const data = (await res.json().catch(() => undefined)) as
      | { access_token?: string; expires_in?: number; error?: string; message?: string; requestId?: string }
      | undefined;
    if (!res.ok || !data?.access_token) {
      throw new LangoApiError(res.status, data?.error ?? "TOKEN_ERROR", data?.message ?? "Could not get a sandbox token.", data?.requestId);
    }
    this.token = data.access_token;
    this.tokenExpiresAt = Date.now() + ((data.expires_in ?? 3600) - 60) * 1000;
    return this.token;
  }

  private async request(
    method: string,
    path: string,
    query: Record<string, string | number | boolean | undefined> | undefined,
    body: unknown,
  ): Promise<unknown> {
    const token = await this.getToken();
    const parts = Object.entries(query ?? {})
      .filter(([, v]) => v !== undefined)
      .map(([k, v]) => `${encodeURIComponent(k)}=${encodeURIComponent(String(v))}`);
    const url = this.baseUrl + path + (parts.length ? `?${parts.join("&")}` : "");
    const res = await fetch(url, {
      method,
      headers: {
        authorization: `Bearer ${token}`,
        ...(body !== undefined ? { "content-type": "application/json" } : {}),
      },
      body: body !== undefined ? JSON.stringify(body) : undefined,
    });
    const data = await res.json().catch(() => undefined);
    if (!res.ok) {
      const d = data as { error?: string; message?: string; requestId?: string } | undefined;
      throw new LangoApiError(res.status, d?.error ?? "REQUEST_FAILED", d?.message ?? res.statusText, d?.requestId);
    }
    return data;
  }

  /** Verify a person */
  async createVerification(body: CreateVerificationRequest): Promise<unknown> {
    return this.request("POST", `/identity/v1/verifications`, undefined, body);
  }

  /** Fetch a past verification */
  async getVerification(params: { verificationId: string }): Promise<unknown> {
    return this.request("GET", `/identity/v1/verifications/${encodeURIComponent(String(params.verificationId))}`, undefined, undefined);
  }
}