import type { RedditHotPostsResponse, RedditPost } from '@/tools/reddit/types'
import { normalizeSubreddit } from '@/tools/reddit/utils'
import type { ToolConfig } from '@/tools/types'

interface HotPostsParams {
  subreddit: string
  limit?: number
  accessToken: string
}

export const hotPostsTool: ToolConfig<HotPostsParams, RedditHotPostsResponse> = {
  id: 'reddit_hot_posts',
  name: 'Reddit Hot Posts',
  description: 'Fetch the most popular (hot) posts from a specified subreddit.',
  version: '1.0.0',

  oauth: {
    required: true,
    provider: 'reddit',
  },

  params: {
    accessToken: {
      type: 'string',
      required: true,
      visibility: 'hidden',
      description: 'Access token for Reddit API',
    },
    subreddit: {
      type: 'string',
      required: true,
      visibility: 'user-or-llm',
      description: 'The subreddit to fetch hot posts from (e.g., "technology", "news")',
    },
    limit: {
      type: 'number',
      required: false,
      visibility: 'user-or-llm',
      description: 'Maximum number of posts to return (e.g., 25). Default: 10, max: 100',
    },
  },

  request: {
    url: (params) => {
      const subreddit = normalizeSubreddit(params.subreddit)
      const limit = Math.min(Math.max(1, params.limit ?? 10), 100)

      return `https://oauth.reddit.com/r/${subreddit}/hot?limit=${limit}&raw_json=1`
    },
    method: 'GET',
    headers: (params: HotPostsParams) => {
      if (!params.accessToken) {
        throw new Error('Access token is required for Reddit API')
      }

      return {
        Authorization: `Bearer ${params.accessToken}`,
        'User-Agent': 'sim-studio/1.0 (https://github.com/simstudioai/sim)',
        Accept: 'application/json',
      }
    },
  },

  transformResponse: async (response: Response, requestParams?: HotPostsParams) => {
    const data = await response.json()

    const posts: RedditPost[] =
      data.data?.children?.map((child: any) => {
        const post = child.data || {}
        return {
          id: post.id ?? '',
          name: post.name ?? '',
          title: post.title ?? '',
          author: post.author || '[deleted]',
          url: post.url ?? '',
          permalink: post.permalink ? `https://www.reddit.com${post.permalink}` : '',
          created_utc: post.created_utc ?? 0,
          score: post.score ?? 0,
          num_comments: post.num_comments ?? 0,
          selftext: post.selftext ?? '',
          thumbnail:
            post.thumbnail !== 'self' && post.thumbnail !== 'default' ? post.thumbnail : undefined,
          is_self: !!post.is_self,
          subreddit: post.subreddit ?? requestParams?.subreddit ?? '',
        }
      }) || []

    const subreddit =
      data.data?.children?.[0]?.data?.subreddit ||
      (posts.length > 0 ? posts[0].subreddit : requestParams?.subreddit || '')

    return {
      success: true,
      output: {
        subreddit,
        posts,
        after: data.data?.after ?? null,
        before: data.data?.before ?? null,
      },
    }
  },

  outputs: {
    subreddit: {
      type: 'string',
      description: 'Name of the subreddit where hot posts were fetched from',
    },
    posts: {
      type: 'array',
      description:
        'Array of hot posts with title, author, URL, score, comments count, and metadata',
      items: {
        type: 'object',
        properties: {
          id: { type: 'string', description: 'Post ID' },
          name: { type: 'string', description: 'Thing fullname (t3_xxxxx)' },
          title: { type: 'string', description: 'Post title' },
          author: { type: 'string', description: 'Author username' },
          url: { type: 'string', description: 'Post URL' },
          permalink: { type: 'string', description: 'Reddit permalink' },
          score: { type: 'number', description: 'Post score (upvotes - downvotes)' },
          num_comments: { type: 'number', description: 'Number of comments' },
          created_utc: { type: 'number', description: 'Creation timestamp (UTC)' },
          is_self: { type: 'boolean', description: 'Whether this is a text post' },
          selftext: { type: 'string', description: 'Text content for self posts' },
          thumbnail: { type: 'string', description: 'Thumbnail URL' },
          subreddit: { type: 'string', description: 'Subreddit name' },
        },
      },
    },
    after: {
      type: 'string',
      description: 'Fullname of the last item for forward pagination',
      optional: true,
    },
    before: {
      type: 'string',
      description: 'Fullname of the first item for backward pagination',
      optional: true,
    },
  },
}