'use strict';

const createBufferReader = require("../buffer-reader");
const createBitParser = require("../../bit-parser");
const decode = require("../decode");
const parseEscapeSequences = require("./escape-sequences");

let parsePermissions = createBitParser([
    "groupOwnerReadable",
    null,
    "groupOwnerExecutable",
    null,
    "ownerReadable",
    null,
    "ownerExecutable",
    null,
    "groupReadable",
    null,
    "groupExecutable",
    null,
    "worldReadable",
    null,
    "worldExecutable",
    null
], {inverse: [0, 2, 4, 6, 8, 10, 12, 14]})

function parseRecordFormat(value) {
    switch (value) {
        case 0:
            return "unspecified";
        case 1:
            return "fixedLength";
        case 2:
            return "variableLengthLSB";
        case 3:
            return "variableLengthMSB";
        default:
            throw new Error(`Unknown record format encountered: ${value}`);
    }
}

function parseRecordAttributes(value) {
    switch (value) {
        case 0:
            return "lineFeedCarriageReturn";
        case 1:
            return "iso1539";
        case 2:
            return "containedInRecord";
        default:
            throw new Error(`Unknown record attributes encountered: ${value}`);
    }
}

module.exports = function parseExtendedAttributeRecord(data, {encoding} = {encoding: "ascii"}) {
    let bufferReader = createBufferReader(data, {encoding: encoding});

    let applicationUseLength = bufferReader.int16_LSB_MSB(246);
    let escapeSequenceLength = bufferReader.int8(181);

    return {
        ownerIdentification: bufferReader.int16_LSB_MSB(0),
        groupIdentification: bufferReader.int16_LSB_MSB(4),
        permissions: parsePermissions(bufferReader.int16_MSB(8)),
        creationDate: bufferReader.decDatetime(10),
        modificationDate: bufferReader.decDatetime(27),
        expirationDate: bufferReader.decDatetime(44),
        effectiveDate: bufferReader.decDatetime(61),
        recordFormat: parseRecordFormat(bufferReader.int8(78)),
        recordAttributes: parseRecordAttributes(bufferReader.int8(79)),
        recordLength: bufferReader.int16_LSB_MSB(80),
        systemIdentifier: bufferReader.strA1(84, 32),
        systemUse: bufferReader.slice(116, 64),
        earVersion: bufferReader.int8(180),
        escapeSequenceLength: escapeSequenceLength,
        applicationUseLength: applicationUseLength,
        applicationUse: bufferReader.slice(250, applicationUseLength),
        escapeSequences: parseEscapeSequences(bufferReader.slice(250 + applicationUseLength, escapeSequenceLength))
    }
};