/**
 * @license
 * Copyright 2025 Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */
import fs from 'node:fs';
import { debug } from './third_party/index.js';
const mcpDebugNamespace = 'mcp:log';
const namespacesToEnable = [
    mcpDebugNamespace,
    ...(process.env['DEBUG'] ? [process.env['DEBUG']] : []),
];
export function saveLogsToFile(fileName) {
    // Enable overrides everything so we need to add them
    debug.enable(namespacesToEnable.join(','));
    const logFile = fs.createWriteStream(fileName, { flags: 'a+' });
    debug.log = function (...chunks) {
        logFile.write(`${chunks.join(' ')}\n`);
    };
    logFile.on('error', function (error) {
        console.error(`Error when opening/writing to log file: ${error.message}`);
        logFile.end();
        process.exit(1);
    });
    return logFile;
}
export function flushLogs(logFile, timeoutMs = 2000) {
    return new Promise((resolve, reject) => {
        const timeout = setTimeout(reject, timeoutMs);
        logFile.end(() => {
            clearTimeout(timeout);
            resolve();
        });
    });
}
export const logger = debug(mcpDebugNamespace);
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