/**
 * Instagram Downloader By: Fastdl.app
 * Base : https://fastdl.app/
 * Author : Gienetic
 * Fitur  : Download Video IG, Reels, Foto, IGTV & korsel IG
 */


import { gotScraping } from "got-scraping";
import crypto from "crypto";

const KUNCI = '792525efde6d921d6055a5d62dcebd39c8b5364e99fa87c5adf0e89391266d9c';
const HOST = 'fastdl.app';
const API = `https://api-wh.${HOST}/api/convert`;
const DATA = { _ts: 1773148641059, _tsc: 0, _sv: 2 };

const saring = (url) => {
  let u = url.trim();
  if (!u.includes("www.instagram.com") && !u.includes("instagr.am")) {
    u = u.replace("instagram.com", "www.instagram.com");
  }
  return u;
};

const tandai = (teks) => {
  const ts = Date.now();
  const k = Buffer.from(KUNCI, 'hex');
  const h = crypto.createHmac('sha256', k);
  h.update(teks + String(ts));
  return { ts, _s: h.digest('hex') };
};

const urai = (xml) => {
  const v = [];
  const a = [];
  const blok = xml.match(/<Representation[^>]*>[\s\S]*?<\/Representation>/g) || [];
  for (const b of blok) {
    const mime = b.match(/mimeType="([^"]+)"/)?.[1] || '';
    const bw = b.match(/bandwidth="(\d+)"/)?.[1];
    const w = b.match(/bandwidth="\d+"[^>]*width="(\d+)"/)?.[1] || b.match(/width="(\d+)"/)?.[1];
    const h = b.match(/height="(\d+)"/)?.[1];
    const ql = b.match(/FBQualityLabel="([^"]+)"/)?.[1];
    const url = b.match(/<BaseURL>([^<]+)<\/BaseURL>/)?.[1];
    if (!url || !bw) continue;
    const isi = { bandwidth: parseInt(bw), url: 'https://' + url.replace(/^https?:\/\//, '') };
    if (mime.startsWith('video/')) {
      isi.width = parseInt(w);
      isi.height = parseInt(h);
      isi.label = ql || (w ? w + 'p' : null);
      v.push(isi);
    } else if (mime.startsWith('audio/')) {
      isi.rate = b.match(/audioSamplingRate="(\d+)"/)?.[1] ? parseInt(b.match(/audioSamplingRate="(\d+)"/)?.[1]) : null;
      a.push(isi);
    }
  }
  return { v, a };
};

export async function ambil(input) {
  const link = saring(input);
  const { ts, _s } = tandai(link);
  const muatan = `sf_url=${encodeURIComponent(link)}&ts=${ts}&_ts=${DATA._ts}&_tsc=${DATA._tsc}&_sv=${DATA._sv}&_s=${_s}`;
  
  const hasil = await gotScraping.post(API, {
    headers: {
      'Accept': 'application/json, text/plain, */*',
      'Origin': `https://${HOST}`,
      'Referer': `https://${HOST}/`,
      'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36 (Gienetic)',
      'Content-Type': 'application/x-www-form-urlencoded;charset=UTF-8'
    },
    body: muatan
  }).json();

  if (hasil?.invalid_request) throw new Error("Format url tidak valid");
  if (!hasil || (!hasil.url && !hasil.meta)) throw new Error("Konten tidak ditemukan");
  
  const m = hasil.meta || {};
  const t = hasil.thumb || null;
  const list = [];
  
  for (const i of (hasil.url || [])) {
    const ext = (i.ext || i.type || "mp4").replace(/[^a-zA-Z0-9]/g, '');
    const isV = /mp4|mov|mkv|webm|gif/i.test(ext);
    const num = i.slide_number || 1;
    let s = list.find(x => x.slide === num);
    if (!s) {
      s = { slide: num, jenis: isV ? 'video' : 'image', format: ext, daftar: [] };
      list.push(s);
    }
    s.daftar.push({ label: i.quality || i.subname || "unknown", url: i.url, sumber: 'direct' });
  }
  
  if (m.dash_manifest) {
    const p = urai(m.dash_manifest);
    if (list.length === 0) list.push({ slide: 1, jenis: 'video', format: 'mp4', daftar: [] });
    for (const v of p.v) {
      if (!list[0].daftar.some(q => q.height === v.height)) {
        list[0].daftar.push({ label: v.label, width: v.width, height: v.height, url: v.url, sumber: 'dash' });
      }
    }
  }
  
  return {
    info: {
      id: m.shortcode || null,
      user: m.username || null,
      judul: m.title || null,
      durasi: m.duration || null,
      like: m.like_count || 0,
      komen: m.comment_count || 0,
      thumb: t,
      waktu: m.taken_at ? new Date(m.taken_at * 1000).toISOString() : null
    },
    media: list,
    audio: m.dash_manifest ? urai(m.dash_manifest).a : []
  };
}

const arg = process.argv[2];
if (arg) {
  ambil(arg)
    .then(r => console.log(JSON.stringify(r, null, 2)))
    .catch(e => console.error(JSON.stringify({ error: e.message }, null, 2)));
}

// node fastdl.js "https://www.instagram.com/reel/DZeY_j7vS9O/"