package http

import (
	"crypto/sha256"
	"go-socket/packages/convertions"
	"go-socket/packages/globals"
	"go-socket/packages/minio"
	"io"
	"net/http"
)

func handleExistingUpload() {
	
}

func HandleFileUpload(response http.ResponseWriter, request *http.Request) {
	if !postValidCheckWithResponseOnFail(&response, request, true) {
		return
	}
	ctx := request.Context()

	user, err := getUserByToken(ctx, request.Header.Get("token"))
	if err != nil {
		http.Error(response, "invalid token", http.StatusUnauthorized)
		return
	}

	connectionId, err := convertions.ConvertStringUuid(request.FormValue("connectionid"))
	if err != nil {
		http.Error(response, "invalid connectionid", http.StatusBadRequest)
		return
	}
	_, ok := user.Connections[connectionId]
	if !ok {
		http.Error(response, "no such connection", http.StatusUnauthorized)
		return
	}

	request.Body = http.MaxBytesReader(response, request.Body, int64(globals.MaxPostWithFileBytes))
	multipartReader, err := request.MultipartReader()
	if err != nil {
		http.Error(response, "expected multipart form", http.StatusBadRequest)
		return
	}

	uploaded := false
	for {
		part, err := multipartReader.NextPart()
		if err == io.EOF {
			break
		}
		if err != nil {
			http.Error(response, "bad request", http.StatusBadRequest)
			return
		}

		if part.FileName() == "" {
			part.Close()
			continue
		}

		if len(part.FileName()) != sha256.Size*2 {
			part.Close()
			http.Error(response, "filename must be hex-encoded sha256 of whole file", http.StatusBadRequest)
			return
		}

		contentType := part.Header.Get("Content-Type")
		key := minio.GetKey(part.FileName(), contentType)

		if minio.DoesExist(ctx, key) {
			part.Close()
			uploaded = true
			continue
		}

		err = minio.Upload(ctx, key, part, -1, contentType, user.Id)
		part.Close()
		if err != nil {
			http.Error(response, "upload failed", http.StatusInternalServerError)
			return
		}

		uploaded = true
	}

	if !uploaded {
		http.Error(response, "no file in request", http.StatusBadRequest)
		return
	}

	response.WriteHeader(http.StatusAccepted)
}