import * as fsp from "node:fs/promises"

import { parseLog } from "@devicescript/compiler"

export interface LogParseOptions {

stats?: boolean

generation?: string

}

export async function logParse(fn: string, options: LogParseOptions) {

const h = await fsp.open(fn, "r")

const r = await parseLog((off, size) => {

const r = Buffer.alloc(size)

return h.read(r, 0, r.length, off).then(() => r)

})

console.log(await r.dump())

if (options.generation != undefined) {

const genidx = parseInt(options.generation)

if (genidx) {

const gen = await r.generation(genidx)

if (options.stats) console.log(await gen.computeStats())

else await gen.forEachEvent()

}

}

}