import { UnsupportedFileTypeError } from "./errors";
import { RelType } from "./office/relationship";

export const MimeType = Object.freeze({
    Png: 'image/png',
    Jpeg: 'image/jpeg',
    Gif: 'image/gif',
    Bmp: 'image/bmp',
    Svg: 'image/svg+xml'
} as const);

export type MimeType = typeof MimeType[keyof typeof MimeType];

export class MimeTypeHelper {

    public static getDefaultExtension(mime: MimeType): string {
        switch (mime) {
            case MimeType.Png:
                return 'png';
            case MimeType.Jpeg:
                return 'jpg';
            case MimeType.Gif:
                return 'gif';
            case MimeType.Bmp:
                return 'bmp';
            case MimeType.Svg:
                return 'svg';
            default:
                throw new UnsupportedFileTypeError(mime);
        }
    }

    public static getOfficeRelType(mime: MimeType): string {
        switch (mime) {
            case MimeType.Png:
            case MimeType.Jpeg:
            case MimeType.Gif:
            case MimeType.Bmp:
            case MimeType.Svg:
                return RelType.Image;
            default:
                throw new UnsupportedFileTypeError(mime);
        }
    }
}