/**
 * Fetch all comments on a given GitHub discussion
 * A simple REST API, built for Cloudflare Workers
 * Code licensed under MIT, (C) Alicia Sykes 2024
 */

addEventListener('fetch', event => {
  event.respondWith(handleRequest(event.request))
})

async function handleRequest(request) {
  const url = new URL(request.url);
  const username = url.searchParams.get('username');
  const repo = url.searchParams.get('repo');
  const discussionId = url.searchParams.get('discussionId');

  if (!username || !repo || !discussionId) {
    return new Response('Missing required parameters', { status: 400 });
  }

  const query = `
  query {
    repository(owner: "${username}", name: "${repo}") {
      discussion(number: ${discussionId}) {
        comments(first: 100) {
          nodes {
            id
            body
            bodyHTML
            author {
              login
              avatarUrl
              ... on User {
                name
                location
                websiteUrl
                createdAt
                followers {
                  totalCount
                }
              }
            }
            createdAt
            lastEditedAt
            upvoteCount
            reactionGroups {
              content
              users {
                totalCount
              }
            }
          }
        }
      }
    }
  }
  
  `;

  try {
    const apiResponse = await fetch('https://api.github.com/graphql', {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json',
        'Authorization': `bearer ${GH_API_TOKEN}`,
				'User-Agent': 'GetDiscussionComments' 
      },
      body: JSON.stringify({ query })
    });

    const result = await apiResponse.json();

    if (!apiResponse.ok) {
      throw new Error(result.message || 'Failed to fetch GitHub data');
    }

    return new Response(JSON.stringify(result.data.repository.discussion.comments.nodes), {
      headers: {
        'Content-Type': 'application/json',
        'Access-Control-Allow-Origin': '*',
        'Access-Control-Allow-Methods': 'GET, OPTIONS',
        'Access-Control-Allow-Headers': 'Content-Type'
      },
    });
  } catch (error) {
    return new Response(error.message, { status: 500 });
  }
}