import { createWriteStream, mkdirSync } from "node:fs";import type { WriteStream } from "node:fs";import { dirname } from "node:path";import { Effect } from "effect"; export type LogLevel = "debug" | "info" | "warn" | "error"; export interface LoggerOptions {  filePath?: string;  onLine?: (line: string, meta: { level: LogLevel }) => void;} export interface Logger {  debug: (message: string, details?: Record<string, unknown>) => void;  info: (message: string, details?: Record<string, unknown>) => void;  warn: (message: string, details?: Record<string, unknown>) => void;  error: (message: string, details?: Record<string, unknown>) => void;  shutdown: () => Effect.Effect<void>;} export const createLogger = (level: LogLevel, options: LoggerOptions = {}): Logger => {  const stream = ((): WriteStream | null => {    if (!options.filePath) return null;    try {      mkdirSync(dirname(options.filePath), { recursive: true });      const output = createWriteStream(options.filePath, { flags: "a" });      output.on("error", () => {});      return output;    } catch {      return null;    }  })();   const priority: Record<LogLevel, number> = {    debug: 10,    info: 20,    warn: 30,    error: 40,  };   const shouldLog = (target: LogLevel): boolean => priority[target] >= priority[level];   const format = (message: string, details?: Record<string, unknown>): string => {    if (!details || Object.keys(details).length === 0) {      return message;    }    return `${message} ${JSON.stringify(details)}`;  };   const toFileLine = (    target: LogLevel,    message: string,    details?: Record<string, unknown>,  ): string => {    const ts = new Date().toISOString();    const base = format(message, details);    return `${ts} ${target.toUpperCase()} ${base}\n`;  };   const tryWrite = (target: LogLevel, message: string, details?: Record<string, unknown>): void => {    const line = toFileLine(target, message, details);     if (stream) {      try {        stream.write(line);      } catch {}    }     if (options.onLine) {      try {        options.onLine(line.trimEnd(), { level: target });      } catch {}    }  };   const shutdown = (): Effect.Effect<void> => {    if (!stream || stream.closed || stream.destroyed) return Effect.void;    return Effect.callback<void>((resume) => {      let completed = false;      const cleanup = (): void => {        stream.removeListener("close", finish);        stream.removeListener("error", finish);      };      const finish = (): void => {        if (completed) return;        completed = true;        cleanup();        resume(Effect.void);      };      stream.once("close", finish);      stream.once("error", finish);      stream.end();      return Effect.sync(() => {        cleanup();        if (!stream.closed) stream.destroy();      });    }).pipe(      Effect.timeoutOrElse({        duration: 2_000,        orElse: () => Effect.sync(() => stream.destroy()),      }),    );  };   return {    debug: (message, details): void => {      if (shouldLog("debug")) {        console.debug(format(message, details));        tryWrite("debug", message, details);      }    },    info: (message, details): void => {      if (shouldLog("info")) {        console.info(format(message, details));        tryWrite("info", message, details);      }    },    warn: (message, details): void => {      if (shouldLog("warn")) {        console.warn(format(message, details));        tryWrite("warn", message, details);      }    },    error: (message, details): void => {      if (shouldLog("error")) {        console.error(format(message, details));        tryWrite("error", message, details);      }    },    shutdown,  };}; export const resolveLogLevel = (fallback: LogLevel): LogLevel => {  const raw = process.env["LOCAL_STUDIO_LOG_LEVEL"]?.toLowerCase();  if (raw === "debug" || raw === "info" || raw === "warn" || raw === "error") {    return raw;  }  return fallback;};