import * as Mime from 'mime-types';
import { randomUUID } from 'crypto';

getFilename(
    basename: string,
    type: string,
    id: number | string, // так то number должен быть, но хз
    mime: string,
  ): string {
    if (!basename || basename.startsWith('.')) {
      return this.createFilename(type, id, mime);
    }
    return this.getFilenameWithExtension(basename, mime);
  }

  private getFilenameWithExtension(basename: string, mime: string): string {
    const extFromMime = this.getExtension(mime);

    const parts = basename.split('.').filter((p) => p.length > 0);

    if (parts.length > 1) {
      return parts.join('.');
    }

    const namePart = parts[0] || this.getBasename();

    return `${namePart}${extFromMime ? `.${extFromMime}` : ''}`;
  }

  private createFilename(
    type: string,
    id: number | string,
    mime: string,
  ): string {
    const basename = this.getBasename(type, id);
    return this.getFilenameWithExtension(basename, mime);
  }

  private getBasename(type?: string, id?: number | string): string {
    if (type && id) {
      return `${type}-${id}`;
    }
    const baseId = randomUUID();
    if (type) {
      return `${type}-${baseId}`;
    }
    return `${baseId}`;
  }

  private getExtension(mime: string): string {
    const ext = Mime.extension(mime);
    return ext || '';
  }
  
  
  
  // usage
  coreMessage.filename = this.getFilename(
      storeResponse.filename,
      attach._type,
      attach.fileId,
      storeResponse.contentType,
    );