import { Request, Response } from "express";
import { fileTypeFromFile } from "file-type";
import { FileTypeResult } from "file-type/core";
import fs from "fs-extra";
import { logger } from "../server.js";
import GenerateUrl from "../util/MediaUrlGen.js";
import GenerateThumbnail from "../util/generateThumbnail.js";
import MediaFile from "../util/interfaces/MediaFile.js";
import ListableChecker from "../util/listableChecker.js";
import { PathToRoFolder } from "../util/pathGenerators.js";
import { FolderPaths, JobRelativeFilePath } from "../util/serverInit.js";

export async function JobsListMedia(req: Request, res: Response) {
  const jobid: string = (req.body.jobid || "").trim();
  await fs.ensureDir(PathToRoFolder(jobid));
  logger.debug("Listing media for job: " + PathToRoFolder(jobid));

  try {
    let ret: MediaFile[];

    if (req.files) {
      ret = await processUploadedFiles(req.files as Express.Multer.File[], jobid);
    } else {
      ret = await processExistingFiles(jobid);
    }

    if (!res.headersSent) res.json(ret);
  } catch (error) {
    logger.error("Error listing job media.", { jobid, error });
    if (!res.headersSent) res.status(500).json(error);
  }
}

async function processUploadedFiles(files: Express.Multer.File[], jobid: string): Promise<MediaFile[]> {
  const processFile = async (file: Express.Multer.File): Promise<MediaFile> => {
    const relativeFilePath: string = JobRelativeFilePath(jobid, file.filename);

    try {
      const relativeThumbPath: string = await GenerateThumbnail(relativeFilePath);

      const type: FileTypeResult | undefined = await Promise.race([
        fileTypeFromFile(relativeFilePath),
        new Promise<undefined>((resolve) => setTimeout(() => resolve(undefined), 5000))
      ]);

      return {
        type,
        size: file.size,
        src: GenerateUrl([FolderPaths.StaticPath, FolderPaths.JobsFolder, jobid, file.filename]),
        thumbnail: GenerateUrl([FolderPaths.StaticPath, FolderPaths.JobsFolder, jobid, relativeThumbPath]),
        thumbnailHeight: 250,
        thumbnailWidth: 250,
        filename: file.filename,
        name: file.filename,
        path: relativeFilePath,
        thumbnailPath: relativeThumbPath
      };
    } catch (error) {
      logger.error(`Error processing uploaded file ${file.filename}:`, error);
      return {
        type: undefined,
        size: file.size,
        src: GenerateUrl([FolderPaths.StaticPath, FolderPaths.JobsFolder, jobid, file.filename]),
        thumbnail: GenerateUrl([FolderPaths.StaticPath, "assets", "file.svg"]),
        thumbnailHeight: 250,
        thumbnailWidth: 250,
        filename: file.filename,
        name: file.filename,
        path: relativeFilePath,
        thumbnailPath: ""
      };
    }
  };

  return (await Promise.all(files.map(processFile))).filter((r): r is MediaFile => r !== null);
}

async function processExistingFiles(jobid: string): Promise<MediaFile[]> {
  const dirPath = PathToRoFolder(jobid);
  const mediaFiles: MediaFile[] = [];
  const dir = await fs.opendir(dirPath);

  for await (const dirent of dir) {
    if (!dirent.isFile() || !ListableChecker(dirent)) continue;

    const file = dirent.name;
    const relativeFilePath: string = JobRelativeFilePath(jobid, file);

    try {
      if (!(await fs.pathExists(relativeFilePath))) {
        logger.warning(`File no longer exists: ${relativeFilePath}`);
        continue;
      }

      const fileStats = await Promise.race([
        fs.stat(relativeFilePath),
        new Promise<never>((_, reject) => setTimeout(() => reject(new Error("File stat timeout")), 5000))
      ]);

      const relativeThumbPath: string = await GenerateThumbnail(relativeFilePath);

      const type: FileTypeResult | undefined = await Promise.race([
        fileTypeFromFile(relativeFilePath),
        new Promise<undefined>((resolve) => setTimeout(() => resolve(undefined), 5000))
      ]);

      mediaFiles.push({
        type,
        size: fileStats.size,
        src: GenerateUrl([FolderPaths.StaticPath, FolderPaths.JobsFolder, jobid, file]),
        thumbnail: GenerateUrl([FolderPaths.StaticPath, FolderPaths.JobsFolder, jobid, relativeThumbPath]),
        thumbnailHeight: 250,
        thumbnailWidth: 250,
        filename: file,
        name: file,
        path: relativeFilePath,
        thumbnailPath: relativeThumbPath
      });
    } catch (error) {
      logger.error(`Error processing existing file ${file}:`, error);

      try {
        const fileStats = await fs.stat(relativeFilePath);
        mediaFiles.push({
          type: undefined,
          size: fileStats.size,
          src: GenerateUrl([FolderPaths.StaticPath, FolderPaths.JobsFolder, jobid, file]),
          thumbnail: GenerateUrl([FolderPaths.StaticPath, "assets", "file.svg"]),
          thumbnailHeight: 250,
          thumbnailWidth: 250,
          filename: file,
          name: file,
          path: relativeFilePath,
          thumbnailPath: ""
        });
      } catch (statError) {
        logger.error(`Could not get stats for ${file}:`, statError);
      }
    }
  }

  return mediaFiles;
}