import axios from "axios";
import type { NextApiRequest, NextApiResponse } from "next";
import qs from "qs";

import { WEBAPP_URL } from "@calcom/lib/constants";
import { getSafeRedirectUrl } from "@calcom/lib/getSafeRedirectUrl";

import getAppKeysFromSlug from "../../_utils/getAppKeysFromSlug";
import getInstalledAppPath from "../../_utils/getInstalledAppPath";
import createOAuthAppCredential from "../../_utils/oauth/createOAuthAppCredential";
import { decodeOAuthState } from "../../_utils/oauth/decodeOAuthState";
import appConfig from "../config.json";

let client_id = "";
let client_secret = "";
function isAuthorizedAccountsServerUrl(accountsServer: string) {
  // As per https://www.zoho.com/crm/developer/docs/api/v6/multi-dc.html#:~:text=US:%20https://accounts.zoho,https://accounts.zohocloud.ca&text=The%20%22location=us%22%20parameter,domain%20in%20all%20API%20endpoints.&text=You%20must%20make%20the%20authorization,.zoho.com.cn.
  const authorizedAccountServers = [
    "https://accounts.zoho.com",
    "https://accounts.zoho.eu",
    "https://accounts.zoho.in",
    "https://accounts.zoho.com.cn",
    "https://accounts.zoho.jp",
    "https://accounts.zohocloud.ca",
    "https://accounts.zoho.com.au",
  ];
  return authorizedAccountServers.includes(accountsServer);
}

export default async function handler(req: NextApiRequest, res: NextApiResponse) {
  const { code, "accounts-server": accountsServer } = req.query;

  if (code === undefined && typeof code !== "string") {
    res.status(400).json({ message: "`code` must be a string" });
    return;
  }

  if (!accountsServer || typeof accountsServer !== "string") {
    res.status(400).json({ message: "`accounts-server` is required and must be a string" });
    return;
  }

  if (!isAuthorizedAccountsServerUrl(accountsServer)) {
    res.status(400).json({ message: "`accounts-server` is not authorized" });
    return;
  }

  if (!req.session?.user?.id) {
    return res.status(401).json({ message: "You must be logged in to do this" });
  }

  const appKeys = await getAppKeysFromSlug("zohocrm");
  if (typeof appKeys.client_id === "string") client_id = appKeys.client_id;
  if (typeof appKeys.client_secret === "string") client_secret = appKeys.client_secret;
  if (!client_id) return res.status(400).json({ message: "Zoho Crm consumer key missing." });
  if (!client_secret) return res.status(400).json({ message: "Zoho Crm consumer secret missing." });
  const url = `${accountsServer}/oauth/v2/token`;
  const redirectUri = `${WEBAPP_URL}/api/integrations/zohocrm/callback`;
  const formData = {
    grant_type: "authorization_code",
    client_id: client_id,
    client_secret: client_secret,
    redirect_uri: redirectUri,
    code: code,
  };
  const zohoCrmTokenInfo = await axios({
    method: "post",
    url: url,
    data: qs.stringify(formData),
    headers: {
      "Content-Type": "application/x-www-form-urlencoded;charset=utf-8",
    },
  });
  // set expiry date as offset from current time.
  zohoCrmTokenInfo.data.expiryDate = Math.round(Date.now() + 60 * 60);
  zohoCrmTokenInfo.data.accountServer = accountsServer;

  await createOAuthAppCredential({ appId: appConfig.slug, type: appConfig.type }, zohoCrmTokenInfo.data, req);

  const state = decodeOAuthState(req);

  res.redirect(
    getSafeRedirectUrl(state?.returnTo) ?? getInstalledAppPath({ variant: "other", slug: "zohocrm" })
  );
}