'use strict';

const symphonyRegistry = '\\Software\\Symphony\\Symphony\\';
const { isMac } = require('./misc.js');

var Registry = require('winreg');
var symphonyRegistryHKCU = new Registry({
    hive: Registry.HKCU,
    key:  symphonyRegistry
});

var symphonyRegistryHKLM = new Registry({
    key:  symphonyRegistry
});

var symphonyRegistryHKLM6432 = new Registry({
    key:  symphonyRegistry.replace('\\Software','\\Software\\WOW6432Node')
});
    
/**
 * Reads Windows Registry key. This Registry holds the Symphony registry keys 
 * that are intended to be used as global (or default) value for all users 
 * running this app.
 */
var getRegistry = function (name) {
    var promise = new Promise(function(resolve, reject) {
        if (isMac){
            reject('Mac OS. Using default url from config.json.');
        } else{
            //Try to get registry on HKEY_CURRENT_USER    
            symphonyRegistryHKCU.get( name, function( err1, reg1 ) {
                if ( !err1 && reg1!==null && reg1.value) {
                    resolve(reg1.value);
                } else{
                    //Try to get registry on HKEY_LOCAL_MACHINE                    
                    symphonyRegistryHKLM.get( name, function( err2, reg2 ) {
                        if ( !err2 && reg2!==null && reg2.value) {
                            resolve(reg2.value);
                        } else{
                            //Try to get registry on HKEY_LOCAL_MACHINE in case 32bit app installed on 64bit system.
                            //winreg does not merge keys as normally windows does.
                            symphonyRegistryHKLM6432.get( name, function( err3, reg3 ) {
                                if ( !err3 && reg3!==null && reg3.value) {
                                    resolve(reg3.value);
                                } else{
                                    reject('Cannot find PodUrl Registry. Using default url.');
                                }
                            });
                        }
                    });
                }
            });
        }
    });
    return promise;
}

module.exports = getRegistry