/**
 * Give a path to an application config file, return a compatible PM2 app object with
 * details and support for .nvmrc, port allocation, and debug mode.
 * 
 * @param {*} path - the path to the *.config.js file, contains the user, domain, etc.
 */

const { version } = require('os');

module.exports = function(path) {
    // Get the app name, user, domain, other details given the file path
    const fs = require('fs');
    let details = {};
    let parse = path.split('/');
    details._config = parse.pop();
    details._app = details._config.replace('.config.js', '');
    details._domain = parse[4];
    details.name = details._app + ' | ' + details._domain;
    details._user = parse[2];
    details.cwd = path.substr(0, path.length - details._config.length - 1);
    details.script = details.cwd + '/' + details._app + '.js';
    details.watch = ['.restart'];
    details.ignore_watch = [];
    details.watch_delay = 5000;
    details.restart_delay = 5000;

    // Support optional .nvmrc file or default to current version
    let nvmrc = details.cwd + '/.nvmrc';
    let ver = 'current';
    if (fs.existsSync(nvmrc)) {
        ver = fs.readFileSync(nvmrc, {encoding: 'utf8', flat: 'r'}).trim();
    }
    const {execSync} = require('child_process');
    ver = execSync('/bin/bash -c "source /opt/nvm/nvm.sh && nvm which ' + ver + '"').toString().trim();
    if (!fs.existsSync(ver)) {
        console.error(ver);
        process.exit(1);
    }
    details.interpreter = ver;

    // Get the interpreter version from path
    let versionMatch = ver.match(/v\d+\.\d+\.\d+/); // Regular expression to match 'v' followed by version numbers
    if (versionMatch) {
        let version = versionMatch[0]; // Extract the matched version
        details.version = version;
    } else {
        console.error('Version not found in the path');
    }

    // Pass the allocated port number as a -p argument
    let port = 0;
    let pfile = '/usr/local/hestia/data/hcpp/ports/' + details._user + '/' + details._domain + '.ports';
    let ports = fs.readFileSync(pfile, {encoding:'utf8', flag:'r'});
    ports = ports.split(/\r?\n/);
    for( let i = 0; i < ports.length; i++) {
        if (ports[i].indexOf(details._app + '_port') > -1) {
            port = ports[i];
            break;
        }
    }
    port = parseInt(port.trim().split(' ').pop());
    details._port = port;
    details.args = "-p " + details._port;

    // Check for debug mode and pass debug port as port + 3000 offset
    if ( fs.existsSync(details.cwd + '/.debug') ) {
        details._debugPort = port + 3000;
        details.interpreter_args = '--inspect=' + details._debugPort;
    }


    details.linkGlobalModules = function(modules) {

        // Ensure node_modules directory exists
        const nodeModulesPath = this.cwd + '/node_modules';
        if (!fs.existsSync(nodeModulesPath)) {
            fs.mkdirSync(nodeModulesPath);
        }
        
        // Setup nvm, use npm version specified in .nvmrc
        let cmd = "bash -c 'export NVM_DIR=/opt/nvm && source /opt/nvm/nvm.sh && nvm use " + this.version + " && ";
        cmd += "cd " + this.cwd + " && ";

        // Link global modules to local node_modules
        for (let i = 0; i < modules.length; i++) {
            cmd += "unlink node_modules/" + modules[i] + " > /dev/null 2>&1 ; npm link " + modules[i] + " > /dev/null 2>&1 ; ";
        }
        cmd += "'";

        // Update npm links
        try {
            const {execSync} = require('child_process');
            execSync(cmd);
        } catch (error) {
            // Eat npm link permissions errors
        }
    }
    return details;
}