export enum FileType {
    Unknown = 0,
    File,
    Directory,
    SymbolicLink
}

export interface UnixPermissions {
    readonly user: number
    readonly group: number
    readonly world: number
}

/**
 * Describes a file, directory or symbolic link.
 */
export class FileInfo {

    static UnixPermission = {
        Read: 4,
        Write: 2,
        Execute: 1
    }

    type = FileType.Unknown
    size = 0
    /**
     * Unparsed, raw modification date as a string.
     *
     * If `modifiedAt` is undefined, the FTP server you're connected to doesn't support the more modern
     * MLSD command for machine-readable directory listings. The older command LIST is then used returning
     * results that vary a lot between servers as the format hasn't been standardized. Here, directory listings
     * and especially modification dates were meant to be human-readable first.
     *
     * Be careful when still trying to parse this by yourself. Parsing dates from listings using LIST is
     * unreliable. This library decides to offer parsed dates only when they're absolutely reliable and safe to
     * use e.g. for comparisons.
     */
    rawModifiedAt = ""
    /**
     * Parsed modification date.
     *
     * Available if the FTP server supports the MLSD command. Only MLSD guarantees dates than can be reliably
     * parsed with the correct timezone and a resolution down to seconds. See `rawModifiedAt` property for the unparsed
     * date that is always available.
     */
    modifiedAt?: Date = undefined
    /**
     * Unix permissions if present. If the underlying FTP server is not running on Unix this will be undefined.
     * If set, you might be able to edit permissions with the FTP command `SITE CHMOD`.
     */
    permissions?: UnixPermissions = undefined
    /**
     * Hard link count if available.
     */
    hardLinkCount?: number = undefined
    /**
     * Link name for symbolic links if available.
     */
    link?: string = undefined
    /**
     * Unix group if available.
     */
    group?: string = undefined
    /**
     * Unix user if available.
     */
    user?: string = undefined
    /**
     * Unique ID if available.
     */
    uniqueID?: string = undefined

    constructor(public name: string) {
        this.name = name
    }

    get isDirectory(): boolean {
        return this.type === FileType.Directory
    }

    get isSymbolicLink(): boolean {
        return this.type === FileType.SymbolicLink
    }

    get isFile(): boolean {
        return this.type === FileType.File
    }

    /**
     * Deprecated, legacy API. Use `rawModifiedAt` instead.
     * @deprecated
     */
    get date(): string {
        return this.rawModifiedAt
    }

    set date(rawModifiedAt: string) {
        this.rawModifiedAt = rawModifiedAt
    }
}