import { Scalar, CustomScalar } from "@nestjs/graphql";
import { FileUpload } from "../helpers";

export type ImageProps = Promise<FileUpload>;

@Scalar("Upload", (type) => Upload)
export class Upload implements CustomScalar<ImageProps, ImageProps> {
  description = "Image file upload type.";
  supportedFormats = ["image/jpeg", "image/png"];
  async parseValue(value: ImageProps): ImageProps {
    return value;
  }

  async serialize(value: ImageProps): ImageProps {
    return value;
  }

  parseLiteral(file: any): any {
    return file;
  }

  // parseLiteral(file: ValueNode) {
  //   if (file.kind === "ObjectValue") {
  //     const fileObject = file as any;
  //     if (
  //       typeof fileObject.filename === "string" &&
  //       typeof fileObject.mimetype === "string" &&
  //       typeof fileObject.encoding === "string" &&
  //       typeof fileObject.createReadStream === "function"
  //     )
  //       return Promise.resolve(fileObject);
  //   }

  //   return null;
  // }

  // async parseValue(value: ImageFileProps) {
  //   // Comes through ok here

  //   const upload = await value;
  //   const stream = upload.createReadStream();
  //   const fileType = await FileType.fromStream(stream);

  //   if (isUndefined(fileType))
  //     throw new BadRequestException("Mime type is unknown.");

  //   if (fileType.mime !== upload.mimetype)
  //     throw new BadRequestException("Mime type does not match file content.");

  //   if (!this.supportedFormats.includes(fileType.mime))
  //     throw new BadRequestException(
  //       `Unsupported file format. Supports: ${this.supportedFormats.join(" ")}.`
  //     );

  //   return upload;
  // }

  // serialize(value: ImageFileProps) {
  //   return value;
  // }
}