"use strict";

const fs = require("fs");
const util = require("util");
const path = require("path");
const { pipeline } = require("stream");
const pump = util.promisify(pipeline);
const crypto = require("crypto");
const mime = require("mime-types");
const exec = util.promisify(require("child_process").execFile);

const UPLOAD_PATH = "./uploads";

module.exports = async function (fastify, opts) {
  fastify.register(require("fastify-multipart"));
  fastify.post("/ocr", async function (req, reply) {
    const data = await req.file();
    const uid = crypto.randomBytes(16).toString("hex");
    const filename = `${UPLOAD_PATH}/${uid}.${mime.extension(data.mimetype)}`;
    const lang = "mal+eng";
    await pump(data.file, fs.createWriteStream(filename));
    const args = [filename, "stdout", "-l", lang];
    const { stdout, stderr } = await exec("tesseract", args);
    exec("rm", ["-f", filename]);
    return {
      text: stdout,
      error: stderr,
    };
  });
};