#!/usr/bin/env node
/* -*- Mode:Js */
/* vim: set expandtab ts=4 sw=4: */
/*
 * You may redistribute this program and/or modify it under the terms of
 * the GNU General Public License as published by the Free Software Foundation,
 * either version 3 of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

const cjdns = require('./lib/cjdnsadmin/cjdnsadmin');
const util = require('util');
const vm = require('vm');
const readline = require('readline');

/**
 * Promisify all functions in an object
 * @param {Object} obj Object to promisify
 */
function promisifyAll(obj) {
    for (let k in obj) {
        if (typeof obj[k] === 'function') {
            obj[k] = util.promisify(obj[k]);
        }
    }
}

/**
 * Connect to cjdns
 * @return {Promise} A promise resolving to the session object
 */
function connect() {
    return new Promise((resolve, reject) => {
        cjdns.connectWithAdminInfo(c => resolve(c));
    });
}

/**
 * Start the shell
 */
async function runShell() {
    let session = await connect();
    console.log([
        `Connected`,
        `Run "functions()" for a list of functions`
    ].join('\n'));
    promisifyAll(session);
    let ctx = vm.createContext(session);
    let rl = readline.createInterface({
        input: process.stdin,
        output: process.stdout,
        prompt: 'cjdns> ',
        removeHistoryDuplicates: true
    });
    rl.on('line', async line => {
        let result;
        try {
            result = vm.runInContext(line, ctx);
            if (typeof result === 'undefined') return rl.prompt();
            if (result.then) result = await result;
        } catch (err) {
            result = err;
        }
        console.dir(result, {colors: true});
        rl.prompt();
    });
    rl.on('close', () => process.exit(0));
    rl.prompt();
}

runShell();