const fork = require("child_process").fork;

let debugArg = process.execArgv.find(args => /^--(debug|inspect)/.test(args));

const debugging = !!debugArg;

debugArg = debugArg ? debugArg.replace('-brk', '').split('=') : ['--debug', 5859];
let lastAddress = parseInt(debugArg[1], 10);

function debugFork(modulePath, args, options) {
    let execArgv = [];
    if (global.v8debug || debugging) {
        lastAddress += 1;
        execArgv = [debugArg[0] + '=' + lastAddress, '--nolazy'];
    }
    if (!Array.isArray(args)) {
        options = args;
        args = [];
    }

    options = options || {};
    options = Object.assign({}, options, {execArgv});

    return fork(modulePath, args, options);
}
debugFork.debugging = debugging;

module.exports = debugFork;