import { appendFile, mkdirSync, existsSync } from 'node:fs';
import { join } from 'node:path';
import { paths } from './paths.js';
const LEVELS = ['debug', 'info', 'warn', 'error'] as const;
type Level = (typeof LEVELS)[number];
const levelPriority: Record<Level, number> = { debug: 0, info: 1, warn: 2, error: 3 };
function getLogLevel(): Level {
const env = process.env.LOG_LEVEL?.toLowerCase();
return LEVELS.includes(env as Level) ? (env as Level) : 'info';
}
function getLogFile(): string {
const date = new Date().toISOString().split('T')[0];
return join(paths.backlogDataDir, 'logs', `backlog-${date}.log`);
}
function write(level: Level, message: string, data?: Record<string, unknown>): void {
if (levelPriority[level] < levelPriority[getLogLevel()]) return;
const logDir = join(paths.backlogDataDir, 'logs');
if (!existsSync(logDir)) {
mkdirSync(logDir, { recursive: true });
}
const entry = JSON.stringify({
timestamp: new Date().toISOString(),
level,
message,
...data,
});
appendFile(getLogFile(), entry + '\n', (err) => {
if (err) {
process.stderr.write(`Logger error: ${err.message}\n`);
}
});
}
export const logger = {
debug: (message: string, data?: Record<string, unknown>) => write('debug', message, data),
info: (message: string, data?: Record<string, unknown>) => write('info', message, data),
warn: (message: string, data?: Record<string, unknown>) => write('warn', message, data),
error: (message: string, data?: Record<string, unknown>) => write('error', message, data),
};
