const patterns = [
    // pack.zip.001, pack.zip.002
    {
        regex: /^(.+\.zip)\.(\d{3,})$/i,
        format: "ZIP",
        pattern: "ZIP_NUMBERED",
        getBaseName: (m) => m[1],
        getPartNumber: (m) => parseInt(m[2], 10),
    },
    // pack.z01, pack.z02 (legacy split — final part is pack.zip)
    {
        regex: /^(.+)\.z(\d{2,})$/i,
        format: "ZIP",
        pattern: "ZIP_LEGACY",
        getBaseName: (m) => m[1],
        getPartNumber: (m) => parseInt(m[2], 10),
    },
    // pack.part1.rar, pack.part2.rar
    {
        regex: /^(.+)\.part(\d+)\.rar$/i,
        format: "RAR",
        pattern: "RAR_PART",
        getBaseName: (m) => m[1],
        getPartNumber: (m) => parseInt(m[2], 10),
    },
    // pack.r00, pack.r01 (legacy split — final part is pack.rar)
    {
        regex: /^(.+)\.r(\d{2,})$/i,
        format: "RAR",
        pattern: "RAR_LEGACY",
        getBaseName: (m) => m[1],
        getPartNumber: (m) => parseInt(m[2], 10),
    },
];
/**
 * Detect if a filename is an archive and extract multipart info.
 */
export function detectArchive(fileName) {
    // Check multipart patterns first
    for (const p of patterns) {
        const match = fileName.match(p.regex);
        if (match) {
            return {
                baseName: p.getBaseName(match),
                partNumber: p.getPartNumber(match),
                format: p.format,
                pattern: p.pattern,
            };
        }
    }
    // Single .zip file — could be a standalone or the final part of a ZIP_LEGACY set
    if (/\.zip$/i.test(fileName)) {
        return {
            baseName: fileName.replace(/\.zip$/i, ""),
            partNumber: -1, // -1 signals "could be single or final legacy part"
            format: "ZIP",
            pattern: "SINGLE",
        };
    }
    // Single .rar file — could be standalone or final part of RAR_LEGACY set
    if (/\.rar$/i.test(fileName)) {
        return {
            baseName: fileName.replace(/\.rar$/i, ""),
            partNumber: -1,
            format: "RAR",
            pattern: "SINGLE",
        };
    }
    return null;
}
/**
 * Check if a filename looks like any archive attachment we should process.
 */
export function isArchiveAttachment(fileName) {
    return detectArchive(fileName) !== null;
}
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