/*---------------------------------------------------------------------------------------------
 *  Copyright (c) Microsoft Corporation. All rights reserved.
 *  Licensed under the MIT License. See License.txt in the project root for license information.
 *--------------------------------------------------------------------------------------------*/
let net = require('net');
let fs = require('fs');
let ENABLE_LOGGING = false;
let log = (function () {
    if (!ENABLE_LOGGING) {
        return function () { }; // tslint:disable-line
    }
    let isFirst = true;
    let LOG_LOCATION = 'C:\\stdFork.log';
    return function log(str) {
        if (isFirst) {
            isFirst = false;
            fs.writeFileSync(LOG_LOCATION, str + '\n');
            return;
        }
        fs.appendFileSync(LOG_LOCATION, str + '\n');
    };
})();
let stdInPipeName = process.env['STDIN_PIPE_NAME']; // tslint:disable-line
let stdOutPipeName = process.env['STDOUT_PIPE_NAME']; // tslint:disable-line
let stdErrPipeName = process.env['STDERR_PIPE_NAME']; // tslint:disable-line
log('STDIN_PIPE_NAME: ' + stdInPipeName);
log('STDOUT_PIPE_NAME: ' + stdOutPipeName);
log('STDERR_PIPE_NAME: ' + stdErrPipeName);
(function () {
    log('Beginning stdout redirection...');
    // Create a writing stream to the stdout pipe
    let stdOutStream = net.connect(stdOutPipeName);
    // unref stdOutStream to behave like a normal standard out
    stdOutStream.unref();
    process.__defineGetter__('stdout', function () {
        return stdOutStream;
    });
    // Create a writing stream to the stderr pipe
    let stdErrStream = net.connect(stdErrPipeName);
    // unref stdErrStream to behave like a normal standard out
    stdErrStream.unref();
    process.__defineGetter__('stderr', function () {
        return stdErrStream;
    });
    let fsWriteSyncString = function (// tslint:disable-line
    fd, str, _position, encoding) {
        //  fs.writeSync(fd, string[, position[, encoding]])
        let buf = Buffer.from(str, encoding || 'utf8');
        return fsWriteSyncBuffer(fd, buf, 0, buf.length); // tslint:disable-line
    };
    let fsWriteSyncBuffer = function (// tslint:disable-line
    fd, buffer, off, len) {
        off = Math.abs(off | 0);
        len = Math.abs(len | 0);
        //  fs.writeSync(fd, buffer, offset, length[, position])
        let buffer_length = buffer.length;
        if (off > buffer_length) {
            throw new Error('offset out of bounds');
        }
        if (len > buffer_length) {
            throw new Error('length out of bounds');
        }
        if (((off + len) | 0) < off) {
            throw new Error('off + len overflow');
        }
        if (buffer_length - off < len) {
            // Asking for more than is left over in the buffer
            throw new Error('off + len > buffer.length');
        }
        let slicedBuffer = buffer;
        if (off !== 0 || len !== buffer_length) {
            slicedBuffer = buffer.slice(off, off + len);
        }
        if (fd === 1) {
            stdOutStream.write(slicedBuffer);
        }
        else {
            stdErrStream.write(slicedBuffer);
        }
        return slicedBuffer.length;
    };
    // handle fs.writeSync(1, ...)
    let originalWriteSync = fs.writeSync;
    fs.writeSync = function (// tslint:disable-line
    fd, data, _position, _encoding) {
        if (fd !== 1 && fd !== 2) {
            return originalWriteSync.apply(fs, arguments);
        }
        // usage:
        //  fs.writeSync(fd, buffer, offset, length[, position])
        // OR
        //  fs.writeSync(fd, string[, position[, encoding]])
        if (data instanceof Buffer) {
            return fsWriteSyncBuffer.apply(null, arguments);
        }
        // For compatibility reasons with fs.writeSync, writing null will write "null", etc
        if (typeof data !== 'string') {
            data += '';
        }
        return fsWriteSyncString.apply(null, arguments);
    };
    log('Finished defining process.stdout, process.stderr and fs.writeSync');
})();
(function () {
    // Begin listening to stdin pipe
    let server = net.createServer(function (stream) {
        // Stop accepting new connections, keep the existing one alive
        server.close();
        log('Parent process has connected to my stdin. All should be good now.');
        process.__defineGetter__('stdin', function () {
            return stream;
        });
        // Remove myself from process.argv
        process.argv.splice(1, 1);
        // Load the actual program
        let program = process.argv[1];
        log('Loading program: ' + program);
        // Unset the custom environmental variables that should not get inherited
        delete process.env['STDIN_PIPE_NAME']; // tslint:disable-line
        delete process.env['STDOUT_PIPE_NAME']; // tslint:disable-line
        delete process.env['STDERR_PIPE_NAME']; // tslint:disable-line
        require(program);
        log('Finished loading program.');
        let stdinIsReferenced = true;
        let timer = setInterval(function () {
            let listenerCount = stream.listeners('data').length +
                stream.listeners('end').length +
                stream.listeners('close').length +
                stream.listeners('error').length;
            // log('listenerCount: ' + listenerCount)
            if (listenerCount <= 1) {
                // No more "actual" listeners, only internal node
                if (stdinIsReferenced) {
                    stdinIsReferenced = false;
                    // log('unreferencing stream!!!')
                    stream.unref();
                }
            }
            else {
                // There are "actual" listeners
                if (!stdinIsReferenced) {
                    stdinIsReferenced = true;
                    stream.ref();
                }
            }
            // log(
            // 	'' + stream.listeners('data').length +
            // 	' ' + stream.listeners('end').length +
            // 	' ' + stream.listeners('close').length +
            // 	' ' + stream.listeners('error').length
            // )
        }, 1000);
        if (timer.unref) { // tslint:disable-line
            timer.unref(); // tslint:disable-line
        }
    });
    server.listen(stdInPipeName, function () {
        // signal via stdout that the parent process can now begin writing to stdin pipe
        process.stdout.write('ready');
    });
})();