// src/lib/api/paymentApi.ts
// Stripe Payment API — يُستخدم بعد قبول الشيخ للجلسة

import { getApiBaseUrl } from './config';

const BASE_URL = getApiBaseUrl();
const TOKEN_KEY = 'authToken';

// ─── Types ────────────────────────────────────────────────────

export interface InitiatePaymentRequest {
  sessionId: number;
  studentId: number;
  sheikhId: number;
  amount: number;
}

export interface InitiatePaymentResponse {
  publishableKey: string;
  clientSecret: string;
  paymentIntentId: string;
}

export interface ConfirmPaymentResponse {
  success: boolean;
  message: string;
  sessionId?: number;
  paymentIntentId?: string;
}

// ─── Error Class ──────────────────────────────────────────────

export class PaymentApiError extends Error {
  public readonly status: number;
  constructor(status: number, message: string) {
    super(message);
    this.status = status;
    this.name = 'PaymentApiError';
  }
}

// ─── Helper ───────────────────────────────────────────────────

function getAuthHeaders(): HeadersInit {
  const token = localStorage.getItem(TOKEN_KEY) ?? '';
  return {
    'Content-Type': 'application/json',
    ...(token ? { Authorization: `Bearer ${token}` } : {}),
  };
}

// ─── API Functions ────────────────────────────────────────────

/**
 * POST /api/payments/initiate/card
 * يبدأ عملية الدفع ويرجع clientSecret و publishableKey من Stripe
 */
export async function initiateCardPayment(
  req: InitiatePaymentRequest
): Promise<InitiatePaymentResponse> {
  const res = await fetch(`${BASE_URL}/api/payments/initiate/card`, {
    method: 'POST',
    headers: getAuthHeaders(),
    body: JSON.stringify(req),
  });

  if (!res.ok) {
    const msg = await res.text().catch(() => res.statusText);
    throw new PaymentApiError(res.status, msg);
  }

  return res.json() as Promise<InitiatePaymentResponse>;
}

/**
 * POST /api/payments/confirm-payment/{paymentIntentId}
 * يؤكد للـ Backend إن Stripe نجح
 */
export async function confirmPaymentWithBackend(
  paymentIntentId: string
): Promise<ConfirmPaymentResponse> {
  const res = await fetch(
    `${BASE_URL}/api/payments/confirm-payment/${paymentIntentId}`,
    {
      method: 'POST',
      headers: getAuthHeaders(),
    }
  );

  if (!res.ok) {
    const msg = await res.text().catch(() => res.statusText);
    throw new PaymentApiError(res.status, msg);
  }

  return res.json() as Promise<ConfirmPaymentResponse>;
}