please analyze this logging module for an obsidian plugin:
import { normalizePath, TFile, TFolder, type Vault } from "obsidian";
import { handleFileSystemError } from "./fileUtils";

let isDebugMode = false;

enum DebugLevel {
    NONE = 0,
    INFO = 1,
    WARNING = 2,
    ERROR = 3,
}

let currentDebugLevel: DebugLevel = DebugLevel.NONE;

export function setDebugLevel(level: DebugLevel): void {
    currentDebugLevel = level;
}

export function setDebugMode(debugMode: boolean) {
    isDebugMode = debugMode;
    if (debugMode) {
        setDebugLevel(DebugLevel.INFO);
    } else {
        setDebugLevel(DebugLevel.NONE);
    }
}

export function devLog(...args: unknown[]): void {
    if (currentDebugLevel === DebugLevel.INFO) {
        console.log(...args.map((arg) => formatMessage(arg)));
        writeLog(args.map((arg) => formatMessage(arg)).join(" "), "INFO");
    }
}

export function devWarn(...args: string[]): void {
    if (currentDebugLevel >= DebugLevel.WARNING) {
        console.warn(...args);
        writeLog(args.map((arg) => formatMessage(arg)).join(" "), "WARNING");
    }
}

export function devError(...args: unknown[]): void {
    if (currentDebugLevel >= DebugLevel.ERROR) {
        console.error(...args.map((arg) => formatMessage(arg)));
        writeLog(args.map((arg) => formatMessage(arg)).join(" "), "ERROR");
    }
}

function formatMessage(arg: unknown): string {
    if (arg instanceof Error) {
        return arg.message;
    }
    if (typeof arg === "object" && arg !== null) {
        return JSON.stringify(arg, null, 2);
    }
    return String(arg);
}

function getFormattedDate(): string {
    const date = new Date();
    return date.toISOString()
        .replace(/[:.]/g, "-") // Replace colons and periods with hyphens
        .replace("T", "_"); // Replace the 'T' in ISO format with an underscore
}

export class LogManager {
    private vault: Vault;
    private logDir: string;
    private logFile: TFile | null = null;
    private logBuffer: string[] = [];
    private isWriting = false;
    private flushTimer: NodeJS.Timeout | undefined;
    private static readonly MAX_BUFFER_SIZE = 1000;
    private static readonly FLUSH_INTERVAL = 1000; // 1 second

    constructor(vault: Vault, logDir: string) {
        this.vault = vault;
        this.logDir = normalizePath(logDir);
    }

    public async initialize(cleanupOptions?: {
        enabled: boolean;
        maxAgeDays?: number;
        maxFiles?: number;
    }): Promise<void> {
        const formattedDate = getFormattedDate();
        try {
            const folderExists = await this.vault.adapter.exists(this.logDir);

            if (!folderExists) {
                devLog(
                    `Log directory ${this.logDir} does not exist. Creating...`,
                );
                try {
                    await this.vault.createFolder(this.logDir);
                    devLog(
                        `Log directory created successfully: ${this.logDir}`,
                    );
                } catch (createError) {
                    console.error(
                        `LogManager: Failed to create log directory ${this.logDir}:`,
                        createError,
                    );
                    throw new Error(
                        `Failed to create log directory: ${
                            createError instanceof Error
                                ? createError.message
                                : String(createError)
                        }`,
                    );
                }
            } else {
                devLog(
                    `Log directory ${this.logDir} exists. Verifying type...`,
                );
                try {
                    const folderStat = await this.vault.adapter.stat(
                        this.logDir,
                    );
                    if (!folderStat || folderStat.type !== "folder") {
                        console.error(
                            `LogManager: Expected folder at ${this.logDir}, but found type '${folderStat?.type}'. Cannot initialize file logging.`,
                        );
                        throw new Error(
                            `Log path ${this.logDir} exists but is not a folder.`,
                        );
                    }
                    devLog(`Log directory ${this.logDir} verified as folder.`);
                    if (cleanupOptions?.enabled) {
                        await this.cleanupOldLogs(
                            cleanupOptions.maxAgeDays,
                            cleanupOptions.maxFiles,
                        );
                    }
                } catch (statError) {
                    console.error(
                        `LogManager: Failed to verify log directory type ${this.logDir}:`,
                        statError,
                    );
                    throw new Error(
                        `Failed to access log directory info: ${
                            statError instanceof Error
                                ? statError.message
                                : String(statError)
                        }`,
                    );
                }
            }

            const levelName = DebugLevel[currentDebugLevel];
            const logFilePath = normalizePath(
                `${this.logDir}/koreader-importer_${formattedDate}_${levelName}.md`,
            );

            const existingLogFile = await this.vault.getAbstractFileByPath(
                logFilePath,
            );
            if (existingLogFile && existingLogFile instanceof TFile) {
                this.logFile = existingLogFile;
                devLog(`Reusing existing log file: ${logFilePath}`);
            } else {
                this.logFile = await this.vault.create(
                    logFilePath,
                    `[${levelName}] Log initialized at ${
                        new Date().toISOString()
                    }\n`,
                );
            }
        } catch (error) {
            console.error("Log initialization failed:", error);
            handleFileSystemError(
                "initializing file logging",
                this.logDir,
                error,
                {
                    shouldThrow: false,
                    customNoticeMessage:
                        "File logging setup failed. Logs will only go to console.",
                },
            );
        }
    }

    public async write(
        message: string,
        level: "INFO" | "WARNING" | "ERROR",
    ): Promise<void> {
        if (currentDebugLevel < DebugLevel.INFO) return;

        const timestamp = new Date().toISOString();
        this.logBuffer.push(`[${timestamp}] [${level}] ${message}`);

        if (this.logBuffer.length >= LogManager.MAX_BUFFER_SIZE) {
            await this.flush();
        } else if (!this.flushTimer) {
            this.flushTimer = setTimeout(
                () => this.flush(),
                LogManager.FLUSH_INTERVAL,
            );
        }
    }

    async flush(): Promise<void> {
        if (this.isWriting || this.logBuffer.length === 0) return;

        this.isWriting = true;
        clearTimeout(this.flushTimer);
        this.flushTimer = undefined;

        const entries = [...this.logBuffer];
        this.logBuffer = [];

        try {
            if (this.logFile) {
                await this.vault.modify(
                    this.logFile,
                    (await this.vault.read(this.logFile)) + entries.join("\n"),
                );
            }
        } catch (e) {
            console.error("Failed to flush log buffer:", e);
            this.logBuffer.unshift(...entries);
        } finally {
            this.isWriting = false;
        }
    }

    private async cleanupOldLogs(
        maxAgeDays = 7,
        maxFileCount?: number,
    ): Promise<void> {
        const folder = this.vault.getAbstractFileByPath(this.logDir);
        if (!folder || !(folder instanceof TFolder)) return;

        const now = Date.now();
        const cutoffTime = now - (maxAgeDays * 24 * 60 * 60 * 1000);
        const logFiles: { file: TFile; mtime: number }[] = [];

        // Collect log files
        for (const file of folder.children) {
            if (
                file instanceof TFile &&
                file.name.startsWith("koreader-importer_")
            ) {
                const stat = await this.vault.adapter.stat(file.path);
                if (stat?.mtime) {
                    logFiles.push({ file, mtime: stat.mtime });
                }
            }
        }

        // Sort by modification time (oldest first)
        logFiles.sort((a, b) => a.mtime - b.mtime);

        // Delete old files
        let i = 0;
        while (i < logFiles.length) {
            const { file, mtime } = logFiles[i];
            if (
                mtime < cutoffTime ||
                (maxFileCount && logFiles.length - i > maxFileCount)
            ) {
                try {
                    await this.vault.delete(file);
                    logFiles.splice(i, 1); // Remove from array
                } catch (error) {
                    console.error(
                        `Failed to delete log file ${file.name}:`,
                        error,
                    );
                    i++;
                }
            } else {
                break;
            }
        }
    }

    public static async promptForCleanup(
        vault: Vault,
        logDir: string,
    ): Promise<{
        enabled: boolean;
        maxAgeDays?: number;
        maxFiles?: number;
    }> {
        return {
            enabled: true,
            maxAgeDays: 7,
        };
    }
}

// Global log manager instance
let logManager: LogManager | null = null;

// Update existing logging functions to use the LogManager
export async function initLogging(
    vault: Vault,
    logFolderPath: string,
    cleanupOptions?: {
        enabled: boolean;
        maxAgeDays?: number;
        maxFiles?: number;
    },
): Promise<string> {
    if (currentDebugLevel < DebugLevel.INFO) return "";

    logManager = new LogManager(vault, logFolderPath);
    await logManager.initialize(cleanupOptions);
    return logFolderPath;
}

export async function closeLogging(): Promise<void> {
    if (logManager) {
        await logManager.flush(); // Ensure buffer is written before unload
        logManager = null; // Release reference
        devLog("Logging flushed and closed.");
    }
}

export async function writeLog(
    message: string,
    level: "INFO" | "WARNING" | "ERROR",
): Promise<void> {
    if (logManager) {
        try {
            await logManager.write(message, level);
        } catch (error) {
            console.error("Error writing log entry:", error);
        }
    } else if (currentDebugLevel >= DebugLevel[level]) {
        console.log(`[LOG FALLBACK - ${level}] ${message}`);
    }
}


and evaluate this suggestion:
Key Observations:

The logging system has a multi-layered structure with DebugLevel enum and multiple logging functions
There's a LogManager class handling file logging
The code has some inconsistencies in logging levels and error handling
Issues to Address:

Logging Levels:

The DebugLevel enum has 4 levels but the logging functions don't fully utilize them
The devWarn function checks for >= WARNING but devError checks for >= ERROR (should be consistent)
Error Handling:

Error handling is inconsistent (some use try/catch, some don't)
Some error messages are not properly formatted
Code Duplication:

Similar logging logic is repeated in multiple functions
Suggested Improvements:

Key Improvements:

Consistent logging level handling
Reduced code duplication
Better error handling
Clearer separation of concerns
More maintainable structure
Additional Recommendations:

Consider using a logging library like winston or loglevel for more features
Add log rotation support in LogManager
Consider adding log level filtering for file vs console output
Add support for structured logging (JSON format)