/***********************************************************************************************************************************************************************
 * File Name: media.controller.js  (admin)
 * Type of Program: Controller
 * Description: Issues short-lived JWT stream tokens for admin asset preview.
 *              Works identically to the client media token flow but is scoped to
 *              admin-authenticated requests and allows any asset regardless of
 *              is_public.  The stream endpoint (/api/client/media/stream/:token)
 *              is shared — the JWT payload shape is identical.
 *
 * Author: Kenneth Obsequio (@lash0000)
 * Date Created: Jun. 22, 2026
 ***********************************************************************************************************************************************************************/
"use strict";

const jwt = require("jsonwebtoken");

const R          = require("../../utils/response.util");
const mdl_Assets = require("../../models/assets/assets.mdl");
const s3         = require("../../services/s3.service");

const MEDIA_SECRET  = process.env.MEDIA_JWT_SECRET ?? process.env.JWT_SECRET;
const TOKEN_TTL_SEC = 30 * 60; // 30 min — admin preview session

const SUPPORTED_TYPES = ["video", "audio", "document", "image"];

function resolveIp(req) {
  const forwarded = req.headers["x-forwarded-for"];
  if (forwarded) return forwarded.split(",")[0].trim();
  return req.ip ?? req.socket?.remoteAddress ?? "unknown";
}

// ─── POST /admin/media/token ──────────────────────────────────────────────────

exports.issueToken = async (req, res) => {
  try {
    const { asset_id } = req.body;
    if (!asset_id) return R.error(res, "asset_id is required.", 400);

    const asset = await mdl_Assets.findOne({
      where: { asset_id, deletedAt: null },
      attributes: ["asset_id", "file_type", "storage_provider", "storage_key", "mime_type", "thumbnail_storage_key"],
    });

    if (!asset) return R.error(res, "Asset not found.", 404);

    if (!SUPPORTED_TYPES.includes(asset.file_type)) {
      return R.error(res, `Asset type "${asset.file_type}" is not supported.`, 400);
    }

    if (asset.storage_provider !== "s3") {
      return R.error(res, "Token flow is for S3 assets only. Use the raw file_url for other providers.", 400);
    }

    const ip = resolveIp(req);

    const token = jwt.sign(
      {
        asset_id,
        user_id:     req.user.user_id,
        storage_key: asset.storage_key,
        file_type:   asset.file_type,
        mime_type:   asset.mime_type,
        ip,
      },
      MEDIA_SECRET,
      { expiresIn: TOKEN_TTL_SEC }
    );

    // ── Presign thumbnail URL so the browser can load it directly ─────────────
    let thumbnail_url = null;
    if (asset.thumbnail_storage_key) {
      try {
        thumbnail_url = await s3.getSignedDownloadUrl(asset.thumbnail_storage_key, TOKEN_TTL_SEC);
      } catch {
        // Non-fatal — thumbnail is cosmetic
      }
    }

    return R.success(res, "Token issued.", {
      token,
      provider:      "s3",
      file_type:     asset.file_type,
      thumbnail_url,
    });

  } catch (err) {
    console.error("[ADMIN][MEDIA][TOKEN]", err);
    return R.error(res, "Could not issue media token.", 500);
  }
};