'use strict';

//https://github.com/sindresorhus/opn/blob/master/index.js
//Modified as this uses target as an argument

import * as childProcess from 'child_process';

// tslint:disable:no-any no-function-expression prefer-template
export function open(opts: any): Promise<childProcess.ChildProcess> {
    // opts = objectAssign({wait: true}, opts);
    if (!opts.hasOwnProperty('wait')) {
        (<any>opts).wait = true;
    }

    let cmd;
    let appArgs = [];
    let args: string[] = [];
    const cpOpts: any = {};
    if (opts.cwd && typeof opts.cwd === 'string' && opts.cwd.length > 0) {
        cpOpts.cwd = opts.cwd;
    }
    if (opts.env && Object.keys(opts.env).length > 0) {
        cpOpts.env = opts.env;
    }

    if (Array.isArray(opts.app)) {
        appArgs = opts.app.slice(1);
        opts.app = opts.app[0];
    }

    if (process.platform === 'darwin') {
        const sudoPrefix = opts.sudo === true ? 'sudo ' : '';
        cmd = 'osascript';
        args = [
            '-e',
            'tell application "terminal"',
            '-e',
            'activate',
            '-e',
            'do script "' + sudoPrefix + [opts.app].concat(appArgs).join(' ') + '"',
            '-e',
            'end tell'
        ];
    } else if (process.platform === 'win32') {
        cmd = 'cmd';
        args.push('/c', 'start');

        if (opts.wait) {
            args.push('/wait');
        }

        if (opts.app) {
            args.push(opts.app);
        }

        if (appArgs.length > 0) {
            args = args.concat(appArgs);
        }
    } else {
        cmd = 'gnome-terminal';
        const sudoPrefix = opts.sudo === true ? 'sudo ' : '';
        args = ['-x', 'sh', '-c', `"${sudoPrefix}${opts.app}" ${appArgs.join(' ')}`];
    }

    const cp = childProcess.spawn(cmd, args, cpOpts);

    if (opts.wait) {
        return new Promise(function(resolve, reject) {
            cp.once('error', reject);

            cp.once('close', function(code) {
                if (code > 0) {
                    reject(new Error(`Exited with code ${code}`));
                    return;
                }

                resolve(cp);
            });
        });
    }

    cp.unref();

    return Promise.resolve(cp);
}