import { gunzip } from "fflate"
import { parseTar } from "nanotar"
import { toUnit8Array } from "../../../bit"

export async function untgz(data: Blob | ArrayBuffer | Uint8Array): Promise<{ [filePath: string]: Uint8Array }> {
    let buffer = await toUnit8Array(data)
    let tar = await new Promise<Uint8Array | null>((resolve, reject) => {
        gunzip(buffer, (err, data) => {
            if (err) reject(err)
            resolve(data)
        })
    })

    if (tar === null) throw new Error("untgz failed, tar is null")

    let ungzipped = parseTar(tar)

    let files: { [filePath: string]: Uint8Array } = {}
    for (const entry of ungzipped) {
        files[entry.name] = <any>entry.data
    }
    return files
}