import { ReqUrlBuilder } from "../utils/url_builder.ts";

export const SAFEBOORU_HOST = "safebooru.org"

export type GetSafebooruPostsFunc = (limit: number, pageId: number, tags: string[]) => Promise<SafebooruPostData[]>
interface SafebooruPostData {
    preview_url: string;
    sample_url: string;
    file_url: string;
    directory: number;
    hash: string;
    width: number;
    height: number;
    id: number;
    image: string;
    change: number;
    owner: string;
    parent_id: number;
    rating: string;
    sample: boolean;
    sample_height: number;
    sample_width: number;
    score: number | null;
    tags: string;
    source: string;
    status: string;
    has_notes: boolean;
    comment_count: number;
}


const tagsArrToUrlParam = (tags: string[]): string => {
  if (tags.length > 0) {
    let hasNonEmpty = false
    for (let i = 0; i < tags.length; i++) {
      if (tags[i].length > 0) {
        hasNonEmpty = true
        break
      }
    }
    if (!hasNonEmpty) return ""

    let param: string = "tags="
    tags.forEach((tag, i) => {
      if (i != 0) { param += " " }
      param += tag
    })
    return param
  }
  return "" 
}
const mkPostsLimitParam = (limit: number): string => `limit=${limit}`
const mkPageIdParam = (pid: number): string => `pid=${pid}`


export const getSafebooruPosts = async (limit: number, pageId: number, tags: string[]): Promise<SafebooruPostData[]> => {
    const reqURL = new ReqUrlBuilder(`${SAFEBOORU_HOST}`).setProtocol("https").setPath("/index.php")
        .setParams("page=dapi", "s=post", "q=index", "json=1") // Default for safebooru API
        .setParams(mkPostsLimitParam(limit), mkPageIdParam(pageId))
        .setParams(tagsArrToUrlParam(tags)).getReqURL() 

    const resp = await fetch(reqURL)
    if (!resp.ok) { return [] }
    const respData = await resp.text() 
    if (respData.length < 3) return []
    const posts: SafebooruPostData[] = JSON.parse(respData)
    return posts
}