import dotenv from "dotenv";
import { Request, Response } from "express";
import fs from "fs-extra";
import multer from "multer";
import path, { resolve } from "path";
import { logger } from "../server";
import GenerateThumbnail from "../util/generateThumbnail";
import generateUniqueFilename, { generateUniqueBillFilename } from "../util/generateUniqueFilename";
import { ConvertHeicFiles } from "../util/heicConverter";
import { PathToRoBillsFolder, PathToVendorBillsFile } from "../util/pathGenerators";
import { BillsListMedia } from "./billsListMedia";

dotenv.config({
  path: resolve(process.cwd(), `.env.${process.env.NODE_ENV || "development"}`)
});

export const BillsMediaUploadMulter = multer({
  storage: multer.diskStorage({
    destination: function (req, file, cb) {
      const jobid: string = (req.body.jobid || "").trim();
      const DestinationFolder: string = PathToRoBillsFolder(jobid);
      fs.ensureDirSync(DestinationFolder);
      cb(jobid === "" || jobid === null ? new Error("Job ID not specified.") : null, DestinationFolder);
    },
    filename: function (req, file, cb) {
      logger.info("Uploading file: ", {
        file: path.basename(file.originalname)
      });
      const invoice_number: string = (req.body.invoice_number || "").trim();

      cb(
        invoice_number === "" || invoice_number === null ? new Error("Invoice number not specified.") : null,
        generateUniqueBillFilename(file, invoice_number)
      );
    }
  })
});

export async function BillsUploadMedia(req: Request, res: Response) {
  try {
    if (!req.files) {
      res.send({
        status: false,
        message: "No file uploaded"
      });
    } else {
      await ConvertHeicFiles(req.files as Express.Multer.File[]);

      const thumbnailGenerationQueue: Promise<string>[] = [];

      //for each file.path, generate the thumbnail.
      (req.files as Express.Multer.File[]).forEach((file) => {
        thumbnailGenerationQueue.push(GenerateThumbnail(file.path));
      });
      await Promise.all(thumbnailGenerationQueue);
      //Check to see if it should be duplicated to the vendor.
      if (process.env.DUPLICATE_BILL_TO_VENDOR) {
        const copyQueue: Promise<void>[] = [];

        //for each file.path, generate the thumbnail.
        (req.files as Express.Multer.File[]).forEach((file) => {
          const vendorid: string = (req.body.vendorid || "").trim();
          const invoice_number: string = (req.body.invoice_number || "").trim();

          copyQueue.push(
            (async () => {
              const target: string = path.join(PathToVendorBillsFile(vendorid), file.filename);
              await fs.ensureDir(path.dirname(target));
              await fs.copyFile(file.path, target);
            })()
          );
          //Copy Queue is not awaited - we don't care if it finishes before we serve up the thumbnails from the jobs directory.
        });
      }

      BillsListMedia(req, res);
    }
  } catch (error) {
    logger.error("Error while uploading Bill Media", {
      files: req.files,
      error
    });
    res.status(500).send(error);
  }
}