'use strict';

const debug = require("debug")("iso9660:parse:path-table");

const roundEven = require("../../round-even");
const parsePathTableRecord = require("./path-table-record");

module.exports = function parsePathTable(buffer, sectorSize) {
    function roundToNextSector(position) {
        return Math.ceil(position / sectorSize) * sectorSize;
    }

    let records = [];
    let pos = 0;

    while (pos < buffer.length) {
        let recordIdentifierLength = buffer.readUInt8(pos);
        let recordLength = roundEven(recordIdentifierLength + 8);

        if (recordIdentifierLength === 0) {
            /* Reached the end of records for this section, throw away the remainder. */
            debug("Ran out of records, skipping to next sector...");
            pos = roundToNextSector(pos);
        } else {
            let parsedRecord = parsePathTableRecord(buffer.slice(pos, pos + recordLength), "L");
            debug(`Found: ${parsedRecord.identifier.filename}`);
            records.push(parsedRecord);

            pos += recordLength;
        }
    }

    return records;
};