import { authenticate } from "../shopify.server";

export async function getTurn14AccessTokenFromMetafield(request) {
  const { admin, session } = await authenticate.admin(request);
  const shop = session.shop;

  // Step 1: Get credentials from metafield
  const gqlRes = await admin.graphql(`
    {
      shop {
        id
        metafield(namespace: "turn14", key: "credentials") {
          value
        }
      }
    }
  `);
  const result = await gqlRes.json();
  const shopId = result?.data?.shop?.id;
  const raw = result?.data?.shop?.metafield?.value;

  if (!raw) {
    throw new Error("❌ No Turn14 credentials found in Shopify metafield.");
  }

  let creds;
  try {
    creds = JSON.parse(raw);
  } catch (err) {
    console.error("❌ Failed to parse Turn14 metafield JSON:", err);
    throw new Error("Malformed Turn14 credential metafield.");
  }

  const now = new Date();
  const expiresAt = new Date(creds.expiresAt);
  const isExpired = now > expiresAt;

  if (!isExpired && creds.accessToken) {
    return creds.accessToken;
  }

  // ⏰ Expired — refresh token from Turn14 API
  const response = await fetch("https://turn14.data4autos.com/v1/auth/token", {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify({
      grant_type: "client_credentials",
      client_id: creds.clientId,
      client_secret: creds.clientSecret,
    }),
  });

  const data = await response.json();

  if (!response.ok) {
    console.error("❌ Failed to refresh Turn14 token:", data);
    throw new Error(data.error || "Failed to refresh Turn14 token");
  }

  const newToken = data.access_token;
  const newExpiresAt = new Date(Date.now() + 3600 * 1000).toISOString();

  const newValue = JSON.stringify({
    clientId: creds.clientId,
    clientSecret: creds.clientSecret,
    accessToken: newToken,
    expiresAt: newExpiresAt,
  }).replace(/"/g, '\\"');

  // Step 3: Update metafield in Shopify
  await admin.graphql(`
    mutation {
      metafieldsSet(metafields: [
        {
          ownerId: "${shopId}"
          namespace: "turn14"
          key: "credentials"
          type: "json"
          value: "${newValue}"
        }
      ]) {
        userErrors {
          field
          message
        }
      }
    }
  `);

  return newToken;
}