import * as Sentry from "@sentry/node";
import { graphql } from "@octokit/graphql";
import type { NextApiRequest, NextApiResponse } from "next";

Sentry.init({
  dsn: process.env.SENTRY_DSN || process.env.NEXT_PUBLIC_SENTRY_DSN || "",
  environment: process.env.NODE_ENV || process.env.VERCEL_ENV || process.env.NEXT_PUBLIC_VERCEL_ENV || "",
});

const handler = async (req: NextApiRequest, res: NextApiResponse) => {
  try {
    if (req.method !== "GET") {
      return res.status(405).send(""); // 405 Method Not Allowed
    }

    // allow custom limit, max. 24 results
    let limit = 24;
    if (parseInt(req.query.limit as string) > 0 && parseInt(req.query.limit as string) < limit) {
      limit = parseInt(req.query.limit as string);
    }

    const result = await fetchRepos(req.query.sort === "top" ? "STARGAZERS" : "PUSHED_AT", limit);

    // let Vercel edge cache results for 15 mins
    res.setHeader("Cache-Control", "s-maxage=900, stale-while-revalidate");

    return res.status(200).json(result);
  } catch (error) {
    console.error(error);

    // log error to sentry, give it 2 seconds to finish sending
    Sentry.captureException(error);
    await Sentry.flush(2000);

    const message = error instanceof Error ? error.message : "Unknown error.";

    // 500 Internal Server Error
    return res.status(500).json({ success: false, message });
  }
};

const fetchRepos = async (sort, limit) => {
  // https://docs.github.com/en/graphql/reference/objects#repository
  const { user } = await graphql(
    `
      query ($username: String!, $sort: String, $limit: Int) {
        user(login: $username) {
          repositories(
            first: $limit
            isLocked: false
            isFork: false
            ownerAffiliations: OWNER
            privacy: PUBLIC
            orderBy: { field: $sort, direction: DESC }
          ) {
            edges {
              node {
                name
                url
                description
                pushedAt
                stargazerCount
                forkCount
                primaryLanguage {
                  name
                  color
                }
              }
            }
          }
        }
      }
    `,
    {
      username: "jakejarvis",
      limit,
      sort,
      headers: {
        authorization: `token ${process.env.GH_PUBLIC_TOKEN}`,
      },
    }
  );

  return user.repositories.edges.map(({ node: repo }) => ({
    name: repo.name,
    url: repo.url,
    description: repo.description,
    updatedAt: new Date(repo.pushedAt),
    stars: repo.stargazerCount,
    forks: repo.forkCount,
    language: repo.primaryLanguage,
  }));
};

export default handler;