import { Request, Response, NextFunction } from "express"
import FileManager from "./data/FileManager.ts"
import TokenManager from "./api/TokenManager.ts"
import UserChatLinker from "./data/UserChatLinker.ts"
import fileUpload from "express-fileupload"

export default class FileUploadMiddleware {
    static checkUser(req: Request, res: Response, chat_id: string | undefined) {
        const userToken = TokenManager.decode(req.headers.token || req.cookies.token)
        if (!TokenManager.checkToken(userToken, req.headers["device-id"] || req.cookies.device_id)) {
            res.status(401).send({
                msg: "401 UnAuthorized",
            })
            return false
        }
        if (chat_id && !UserChatLinker.checkUserIsLinkedToChat(userToken.author, chat_id)) {
            res.status(403).send({
                msg: "403 Forbidden",
            })
            return false
        }
        return true
    }

    static checkAccessingUploadedFiles(req: Request, res: Response, next: NextFunction) {
        const hash = req.params.hash as string
        if (hash == null) {
            res.status(404).send({
                msg: "404 Not Found",
            })
            return
        }
        const file = FileManager.findByHash(hash)

        if (file == null) {
            res.status(404).send({
                msg: "404 Not Found",
            })
            return
        }

        if (file.getChatId() != null) {
            if (!FileUploadMiddleware.checkUser(req, res, file.getChatId() as string)) {
                return
            }
        }
        next()
    }

    static checkUploadedFile(req: Request, res: Response, next: NextFunction) {
        if (!FileUploadMiddleware.checkUser(req, res, req.body.chat_id)) {
            return
        }
        const file = req.files?.file as fileUpload.UploadedFile
        if (file?.data == null) {
            res.status(400).send({
                msg: "No file was found or multiple files were uploaded",
            })
            return
        }
        if (req.body.file_name == null) {
            res.status(400).send({
                msg: "Filename is required",
            })
            return
        }
        next()
    }
}