import { createRestAPIClient } from 'masto'
import { parseURL, withProtocol } from 'ufo'

import { linkifyBareUrls } from './linkify'

export default defineEventHandler(async event => {
  const acct = useRuntimeConfig(event).social.networks.mastodon.identifier

  const server = acct.split('@')[1]
  if (!server) throw createError('Invalid Mastodon account identifier')
  const data = await $fetch<{ subject: string, aliases: string[] }>(
    '.well-known/webfinger',
    {
      baseURL: withProtocol(server, 'https://'),
      query: {
        resource: `acct:${acct}`,
      },
    },
  )
  const { host, protocol } = parseURL(data.aliases[0])

  const client = createRestAPIClient({
    url: withProtocol(host!, protocol!),
  })
  const { id } = await client.v1.accounts.lookup({ acct })
  const posts = await client.v1.accounts
    .$select(id)
    .statuses.list({ limit: 200 })
  return Promise.all(
    posts
      .filter(p => p.content && !p.inReplyToId)
      .map(p => ({
        network: 'mastodon' as const,
        accountLink: `https://elk.zone/${host}/@${p.account.acct}`,
        avatar: p.account.avatar,
        handle: p.account.displayName.replace(
          /:([a-z-]+):/g,
          (string, shortcode) => {
            const emoji = p.account.emojis.find(
              e => e.shortcode === shortcode,
            )
            if (!emoji) return string
            return `<img src="${emoji.url}" style="height:1em" alt="${shortcode} emoji" />`
          },
        ),
        createdAt: p.createdAt,
        permalink: p.url?.replace('https://', 'https://elk.zone/') ?? p.uri,
        media: p.mediaAttachments.map(m => ({
          url: m.url,
          width: m.meta?.original?.width,
          height: m.meta?.original?.height,
          alt: m.description,
        })),
        html: linkifyBareUrls(p.content),
      })),
  )
})

export interface MastodonFeedItem {
  network: 'mastodon'
  accountLink: string
  avatar?: string
  handle: string
  createdAt: string
  permalink: string
  media: {
    url: string
    width?: number
    height?: number
    alt?: string | null
  }[]
  html: string
}