import type { ForgeProvider, RepoRef } from 'forges'
import { github } from 'forges/github'

export const SLIDES_REPO: RepoRef = { forge: 'github', instance: 'github.com', owner: 'danielroe', name: 'slides' }

export function createGitHub (token: string): ForgeProvider {
  return github({
    auth: { type: 'token', token },
    userAgent: 'roe (https://roe.dev, 0.1)',
  }).create()
}

export async function githubGraphQL<T> (
  gh: ForgeProvider,
  query: string,
  variables?: Record<string, unknown>,
): Promise<T> {
  const { data } = await gh.request<{ data?: T, errors?: Array<{ message: string }> }>('POST', '/graphql', {
    body: { query, variables },
  })
  if (data.errors?.length || !data.data) {
    throw new Error(`GitHub GraphQL request failed: ${data.errors?.map(e => e.message).join('; ') || 'empty response'}`)
  }
  return data.data
}

export async function downloadSlides (gh: ForgeProvider, tag: string): Promise<ArrayBuffer | undefined> {
  const release = await gh.releases.getByTag(SLIDES_REPO, tag)
  const asset = release.assets?.find(a => a.name.endsWith('.pdf'))?.ref
  if (!asset) return
  return new Response(await gh.releases.downloadAsset(asset)).arrayBuffer()
}