import { Router } from "express";
import { randomUUID } from "crypto";
import multer from "multer";
import {
  S3Client, PutObjectCommand, GetObjectCommand,
  CreateBucketCommand, HeadBucketCommand,
} from "@aws-sdk/client-s3";
import pg from "pg";

const { Pool } = pg;
const router = Router();

const s3 = new S3Client({
  region: process.env.S3_REGION || "us-east-1",
  endpoint: process.env.S3_ENDPOINT || "http://127.0.0.1:9000",
  forcePathStyle: true,
  credentials: {
    accessKeyId: process.env.S3_ACCESS_KEY || "UN0-admin",
    secretAccessKey: process.env.S3_SECRET_KEY || "RAygtZHqGN49qKn",
  },
});
const BUCKET = process.env.S3_BUCKET || "uno-click";

// ffmpeg-api теперь доступен на хосте через 127.0.0.1:8000
const FFMPEG_API = process.env.FFMPEG_API_URL || "http://127.0.0.1:8000";

const pool = new Pool({
  host: process.env.PG_HOST || "127.0.0.1",
  port: Number(process.env.PG_PORT || 5432),
  database: process.env.PG_DATABASE || "n8n",
  user: process.env.PG_USER || "n8n",
  password: process.env.PG_PASSWORD,
});

async function ensureBucket() {
  try { await s3.send(new HeadBucketCommand({ Bucket: BUCKET })); }
  catch { await s3.send(new CreateBucketCommand({ Bucket: BUCKET })); }
}
ensureBucket().catch(console.error);

pool.query(`CREATE TABLE IF NOT EXISTS video_jobs (
  job_id TEXT PRIMARY KEY,
  status TEXT NOT NULL DEFAULT 'queued',
  input_s3_key TEXT,
  output_s3_key TEXT,
  error_msg TEXT,
  created_at TIMESTAMPTZ DEFAULT NOW(),
  updated_at TIMESTAMPTZ DEFAULT NOW()
)`).then(() => console.log("[media] video_jobs table ready")).catch(console.error);

const upload = multer({
  storage: multer.memoryStorage(),
  limits: { fileSize: 500 * 1024 * 1024 },
  fileFilter: (req, file, cb) => {
    if (file.mimetype.startsWith("video/")) cb(null, true);
    else cb(new Error("Only video files allowed"));
  },
});

// Рандомные параметры уникализации для ffmpeg-api
function buildFFmpegArgs() {
  const r = (a, b) => Math.random() * (b - a) + a;
  const hue   = r(0, 5).toFixed(1);
  const sat   = r(0, 5).toFixed(1);
  const br    = r(-0.05, 0.05).toFixed(2);
  const con   = r(0.98, 1.05).toFixed(2);
  const satv  = r(0.95, 1.1).toFixed(2);
  const noise = Math.round(r(10, 20));
  const speed = r(0.97, 0.99).toFixed(3);
  const tempo = (1 / parseFloat(speed)).toFixed(3);
  const scale = r(0.94, 0.98).toFixed(2);
  const pad   = (1 / parseFloat(scale)).toFixed(4);
  const vol   = r(1.0, 1.1).toFixed(2);
  const crf   = Math.round(r(20, 24));

  return [
    "-c:v", "libx264", "-preset", "medium", "-crf", String(crf),
    "-c:a", "aac", "-b:a", "128k",
    "-vf", [
      `hue=s=${sat}:h=${hue}`,
      `eq=brightness=${br}:contrast=${con}:saturation=${satv}`,
      `noise=alls=${noise}:allf=t+u`,
      `setpts=${speed}*PTS`,
      `scale=iw*${scale}:ih*${scale}`,
      `pad=iw*${pad}:ih*${pad}:(ow-iw)/2:(oh-ih)/2`,
    ].join(","),
    "-af", `volume=${vol},atempo=${tempo}`,
    "-max_muxing_queue_size", "1024",
  ];
}

// Вызывает ffmpeg-api /run-s3 асинхронно, потом обновляет БД
async function processVideoJob(jobId, inputKey, outputKey) {
  console.log("[media] calling ffmpeg-api for job:", jobId);
  try {
    await pool.query(
      "UPDATE video_jobs SET status='processing', updated_at=NOW() WHERE job_id=$1",
      [jobId],
    );

    const body = {
      job_id:      jobId,
      input_s3:    `s3://${BUCKET}/${inputKey}`,
      output_s3:   `s3://${BUCKET}/${outputKey}`,
      ffmpeg_args: buildFFmpegArgs(),
    };

    const resp = await fetch(`${FFMPEG_API}/run-s3`, {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify(body),
      signal: AbortSignal.timeout(600_000), // 10 минут
    });

    const data = await resp.json();
    console.log("[media] ffmpeg-api response:", resp.status, JSON.stringify(data).slice(0, 200));

    if (!resp.ok || !data.ok) {
      throw new Error(data.detail ? JSON.stringify(data.detail) : "ffmpeg-api error");
    }

    await pool.query(
      "UPDATE video_jobs SET status='done', updated_at=NOW() WHERE job_id=$1",
      [jobId],
    );
    console.log("[media] job done:", jobId);
  } catch (err) {
    console.error("[media] job failed:", jobId, err.message);
    await pool.query(
      "UPDATE video_jobs SET status='error', error_msg=$2, updated_at=NOW() WHERE job_id=$1",
      [jobId, err.message],
    ).catch(() => {});
  }
}

// ─── POST /api/media/upload-video ─────────────────────────────────────────────
router.post("/upload-video", upload.single("video"), async (req, res) => {
  if (!req.file) return res.status(400).json({ error: "Field video required" });
  const jobId     = randomUUID();
  const inputKey  = `videos/input/${jobId}.mp4`;
  const outputKey = `videos/output/${jobId}.mp4`;

  try {
    // 1. Загружаем в MinIO
    await s3.send(new PutObjectCommand({
      Bucket: BUCKET, Key: inputKey,
      Body: req.file.buffer, ContentType: req.file.mimetype || "video/mp4",
    }));

    // 2. Создаём задачу в БД
    await pool.query(
      "INSERT INTO video_jobs (job_id, status, input_s3_key, output_s3_key) VALUES ($1,$2,$3,$4)",
      [jobId, "queued", inputKey, outputKey],
    );

    // 3. Отвечаем фронту немедленно
    res.json({ ok: true, job_id: jobId });

    // 4. Запускаем FFmpeg через ffmpeg-api в фоне (не блокирует ответ)
    processVideoJob(jobId, inputKey, outputKey);

  } catch (err) {
    console.error("[upload-video]", err);
    if (!res.headersSent) res.status(500).json({ error: err.message });
  }
});

// ─── GET /api/media/status/:job_id ────────────────────────────────────────────
router.get("/status/:job_id", async (req, res) => {
  const { job_id } = req.params;
  try {
    const { rows } = await pool.query(
      "SELECT status, output_s3_key, error_msg FROM video_jobs WHERE job_id=$1",
      [job_id],
    );
    if (!rows.length) return res.status(404).json({ error: "Job not found" });

    const job = rows[0];
    const PUBLIC_BFF = process.env.PUBLIC_BFF_URL || "https://uno-click.pip-test.ru";
    const url = job.status === "done"
      ? `${PUBLIC_BFF}/api/media/download/${job_id}`
      : null;

    res.json({ status: job.status, url, error: job.error_msg || null });
  } catch (err) {
    res.status(500).json({ error: err.message });
  }
});

// ─── GET /api/media/download/:job_id ──────────────────────────────────────────
router.get("/download/:job_id", async (req, res) => {
  const { job_id } = req.params;
  try {
    const { rows } = await pool.query(
      "SELECT status, output_s3_key FROM video_jobs WHERE job_id=$1",
      [job_id],
    );
    if (!rows.length) return res.status(404).json({ error: "Job not found" });
    if (rows[0].status !== "done") return res.status(409).json({ error: "Not ready yet" });

    const s3Resp = await s3.send(
      new GetObjectCommand({ Bucket: BUCKET, Key: rows[0].output_s3_key }),
    );
    res.setHeader("Content-Type", "video/mp4");
    res.setHeader("Content-Disposition", `attachment; filename="uniqueized_${job_id}.mp4"`);
    if (s3Resp.ContentLength) res.setHeader("Content-Length", s3Resp.ContentLength);
    s3Resp.Body.pipe(res);
  } catch (err) {
    console.error("[download]", err);
    res.status(500).json({ error: err.message });
  }
});

export default router;