/***********************************************************************************************************************************************************************
 * File Name: paypal.provider.js
 * Type of Program: Payment Provider
 * Description: PayPal Orders API — create order, capture order, refund capture.
 *              Canonical provider used by payment.service.js via the provider registry.
 * Author: Kenneth Obsequio (@lash0000)
 * Date Created: Jun. 29, 2026
 ***********************************************************************************************************************************************************************/
'use strict';

const axios = require('axios');

const BASE_URL = process.env.PAYPAL_ENV === 'live'
  ? 'https://api-m.paypal.com'
  : 'https://api-m.sandbox.paypal.com';

const getAccessToken = async () => {
  const { data } = await axios.post(
    `${BASE_URL}/v1/oauth2/token`,
    'grant_type=client_credentials',
    {
      auth: {
        username: process.env.PAYPAL_CLIENT_ID,
        password: process.env.PAYPAL_CLIENT_SECRET,
      },
      headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
    }
  );
  return data.access_token;
};

exports.createOrder = async ({ amount, currency = 'USD', referenceId, returnUrl, cancelUrl }) => {
  const token = await getAccessToken();
  const { data } = await axios.post(
    `${BASE_URL}/v2/checkout/orders`,
    {
      intent: 'CAPTURE',
      purchase_units: [{
        reference_id: referenceId,
        amount: { currency_code: currency, value: String(amount) },
      }],
      application_context: {
        return_url: returnUrl ?? `${process.env.FRONTEND_URL}/subscriptions/checkout`,
        cancel_url: cancelUrl ?? `${process.env.FRONTEND_URL}/subscriptions/checkout?cancelled=true`,
        brand_name: process.env.PAYPAL_BRAND_NAME ?? 'STARR',
        user_action: 'PAY_NOW',
      },
    },
    { headers: { Authorization: `Bearer ${token}`, 'Content-Type': 'application/json' } }
  );
  return data;
};

exports.captureOrder = async (orderId) => {
  const token = await getAccessToken();
  const { data } = await axios.post(
    `${BASE_URL}/v2/checkout/orders/${orderId}/capture`,
    {},
    { headers: { Authorization: `Bearer ${token}`, 'Content-Type': 'application/json' } }
  );
  return data;
};

exports.refundCapture = async (captureId, amount, currency = 'USD') => {
  const token = await getAccessToken();
  const { data } = await axios.post(
    `${BASE_URL}/v2/payments/captures/${captureId}/refund`,
    { amount: { value: String(amount), currency_code: currency } },
    { headers: { Authorization: `Bearer ${token}`, 'Content-Type': 'application/json' } }
  );
  return data;
};