import { Stream } from "stream";

import { File } from "@file/file";

import { Compiler } from "./next-compiler";

/**
 * Use blanks to prettify
 */
export const PrettifyType = {
    NONE: "",
    WITH_2_BLANKS: "  ",
    WITH_4_BLANKS: "    ",

    WITH_TAB: "\t",
} as const;

const convertPrettifyType = (
    prettify?: boolean | (typeof PrettifyType)[keyof typeof PrettifyType],
): (typeof PrettifyType)[keyof typeof PrettifyType] | undefined =>
    prettify === true ? PrettifyType.WITH_2_BLANKS : prettify === false ? undefined : prettify;

export class Packer {
    public static async toString(file: File, prettify?: boolean | (typeof PrettifyType)[keyof typeof PrettifyType]): Promise<string> {
        const zip = this.compiler.compile(file, convertPrettifyType(prettify));
        const zipData = await zip.generateAsync({
            type: "string",
            mimeType: "application/vnd.openxmlformats-officedocument.wordprocessingml.document",
            compression: "DEFLATE",
        });

        return zipData;
    }

    public static async toBuffer(file: File, prettify?: boolean | (typeof PrettifyType)[keyof typeof PrettifyType]): Promise<Buffer> {
        const zip = this.compiler.compile(file, convertPrettifyType(prettify));
        const zipData = await zip.generateAsync({
            type: "nodebuffer",
            mimeType: "application/vnd.openxmlformats-officedocument.wordprocessingml.document",
            compression: "DEFLATE",
        });

        return zipData;
    }

    public static async toBase64String(file: File, prettify?: boolean | (typeof PrettifyType)[keyof typeof PrettifyType]): Promise<string> {
        const zip = this.compiler.compile(file, convertPrettifyType(prettify));
        const zipData = await zip.generateAsync({
            type: "base64",
            mimeType: "application/vnd.openxmlformats-officedocument.wordprocessingml.document",
            compression: "DEFLATE",
        });

        return zipData;
    }

    public static async toBlob(file: File, prettify?: boolean | (typeof PrettifyType)[keyof typeof PrettifyType]): Promise<Blob> {
        const zip = this.compiler.compile(file, convertPrettifyType(prettify));
        const zipData = await zip.generateAsync({
            type: "blob",
            mimeType: "application/vnd.openxmlformats-officedocument.wordprocessingml.document",
            compression: "DEFLATE",
        });

        return zipData;
    }

    public static toStream(file: File, prettify?: boolean | (typeof PrettifyType)[keyof typeof PrettifyType]): Stream {
        const stream = new Stream();
        const zip = this.compiler.compile(file, convertPrettifyType(prettify));

        zip.generateAsync({
            type: "nodebuffer",
            mimeType: "application/vnd.openxmlformats-officedocument.wordprocessingml.document",
            compression: "DEFLATE",
        }).then((z) => {
            stream.emit("data", z);
            stream.emit("end");
        });

        return stream;
    }

    private static readonly compiler = new Compiler();
}