import fetch from "node-fetch";

// set some important variables
const { CLIENT_ID, APP_SECRET } = process.env;
const base = "https://api-m.sandbox.paypal.com";  

// call the create order method
export async function createOrder(data,PaypalClientId,PaypalAppSecret) {  
  const purchaseAmount = data.price;//"100.00"; // TODO: pull prices from a database 
  const accessToken = await generateAccessToken(PaypalClientId,PaypalAppSecret);
  const url = `${base}/v2/checkout/orders`;
  const response = await fetch(url, {
    method: "post",
    headers: {
      "Content-Type": "application/json",
      Authorization: `Bearer ${accessToken}`,
    },
    body: JSON.stringify({
      intent: "CAPTURE",
      purchase_units: [
        {
          amount: {
            currency_code: "USD",
            value: purchaseAmount,
          },
        },
      ],
    }),
  });

  return handleResponse(response);
}

// capture payment for an order
export async function capturePayment(orderId,PaypalClientId,PaypalAppSecret) {
  const accessToken = await generateAccessToken(PaypalClientId,PaypalAppSecret);
  const url = `${base}/v2/checkout/orders/${orderId}/capture`;
  const response = await fetch(url, {
    method: "post",
    headers: {
      "Content-Type": "application/json",
      Authorization: `Bearer ${accessToken}`,
    },
  });

  return handleResponse(response);
}

// generate access token
export async function generateAccessToken(PaypalClientId,PaypalAppSecret) {
  console.log(PaypalClientId + ":" + PaypalAppSecret);
  const auth = Buffer.from(PaypalClientId + ":" + PaypalAppSecret).toString("base64");
  console.log(auth);
  const response = await fetch(`${base}/v1/oauth2/token`, {
    method: "post",
    body: "grant_type=client_credentials",
    headers: {
      Authorization: `Basic ${auth}`,
    },
  });
  const jsonData = await handleResponse(response);
  return jsonData.access_token;
}

// generate client token
export async function generateClientToken(PaypalClientId,PaypalAppSecret) {
  const accessToken = await generateAccessToken(PaypalClientId,PaypalAppSecret);
  const response = await fetch(`${base}/v1/identity/generate-token`, {
    method: "post",
    headers: {
      Authorization: `Bearer ${accessToken}`,
      "Accept-Language": "en_US",
      "Content-Type": "application/json",
    },
  });
  console.log('response', response.status)
  const jsonData = await handleResponse(response);
  return jsonData.client_token;
}

async function handleResponse(response) {
  if (response.status === 200 || response.status === 201) {
    return response.json();
  }

  const errorMessage = await response.text();
  throw new Error(errorMessage);
}


// capture payment for an order
export async function refundPayment(orderId) { 
  const accessToken = await generateAccessToken();
  const url = `${base}/v2/payments/captures/${capture_id}/refund`;
  const response = await fetch(url, {
    method: "post",
    headers: {
      "Content-Type": "application/json",
      "Authorization": `Bearer ${accessToken}`,
      'PayPal-Request-Id': '123e4567-e89b-12d3-a456-426655440020',
      'Prefer': 'return=representation'
    },
    body: JSON.stringify(
      { 
        "amount": { "value": "10.00", "currency_code": "USD" }, 
        "invoice_id": "INVOICE-123", 
        "note_to_payer": "DefectiveProduct", 
        "payment_instruction": { 
            "platform_fees": [ 
              { 
                "amount": { 
                  "currency_code": "USD", 
                  "value": "1.00" 
                } 
              } 
            ] 
        } 
      })
  });

  return handleResponse(response);
}