Zazama / node-id3

import { FrameBuilder } from "../FrameBuilder"

import { FrameReader } from "../FrameReader"

import type { Data } from "./type"

export const POPM = {

    create: (data: Data) => {

        const email = data.email

        let rating = Math.trunc(data.rating)

        let counter = Math.trunc(data.counter)

        if(!email) {

            return null

        }

        if(isNaN(rating) || rating < 0 || rating > 255) {

            rating = 0

        }

        if(isNaN(counter) || counter < 0) {

            counter = 0

        }

        return new FrameBuilder("POPM")

            .appendNullTerminatedValue(email)

            .appendNumber(rating, 1)

            .appendNumber(counter, 4)

            .getBuffer()

    },

    read: (buffer: Buffer) => {

        const reader = new FrameReader(buffer)

        return {

            email: reader.consumeNullTerminatedValue('string'),

            rating: reader.consumeStaticValue('number', 1),

            counter: reader.consumeStaticValue('number')

        }

    }

}