// Modules
import replace from 'replace-in-file';

class Options {
    constructor(key, updatedValue) {
        this.files = ".env";
        // A regex of the line containing the key in the config file
        this.from = new RegExp(`${key}="?(.+)?"?`, "g");
        // Check to see if the value is a string and needs to be wrapped in double quotes
        if (Array(["string", "number"]).includes(typeof updatedValue)) this.to = `${key}="${updatedValue}",`;
        else this.to = `${key}=${updatedValue}`;
    }
}

/**
 * Wrapper to update the client's saved ID
 * @param updatedId The updated ID assigned to the node
 */
export const updateId = async (updatedId) => {
    await updateConfig('CLIENT_NUID', updatedId);
    process.env.CLIENT_NUID = updatedId;
    console.log("Updated NUID to: ", updatedId);
}

/**
 * Wrapper to update any or all keys in the client config
 * 
 * @param {Object} runningConfig Running config object
 * @param {Object} newConfigObject Object with what keys you wish to update (node object format, will be converted)
 * @param {number} newConfigObject.nuid The ID given to the node to update 
 * @param {string} newConfigObject.name The name of the node
 * @param {string} newConfigObject.ip The IP the server can contact the node on
 * @param {number} newConfigObject.port The port the server can contact the node on 
 * @param {string} newConfigObject.location The physical location of the node
 * @returns 
 */
export function updateClientConfig (runningConfig, newConfigObject) {
    var updatedKeys = []
    const configKeys = Object.keys(newConfigObject);

    if (configKeys.includes("nuid")) {
        if (runningConfig.nuid != newConfigObject.nuid) {
            this.updateId(newConfigObject.nuid);
            updatedKeys.push({ 'CLIENT_NUID': newConfigObject.nuid });
        }
    }
    if (configKeys.includes("name")) {
        if (runningConfig.name != newConfigObject.name) {
            this.updateConfig('CLIENT_NAME', newConfigObject.name);
            updatedKeys.push({ 'CLIENT_NAME': newConfigObject.name });
            process.env.CLIENT_NAME = newConfigObject.name;
            console.log("Updated name to: ", newConfigObject.name);
        }
    }
    if (configKeys.includes("ip")) {
        if (runningConfig.ip != newConfigObject.ip) {
            this.updateConfig('CLIENT_IP', newConfigObject.ip);
            updatedKeys.push({ 'CLIENT_IP': newConfigObject.ip });
            process.env.CLIENT_IP = newConfigObject.ip;
            console.log("Updated ip to: ", newConfigObject.ip);
        }
    }
    if (configKeys.includes("port")) {
        if (runningConfig.port != newConfigObject.port) {
            this.updateConfig('CLIENT_PORT', newConfigObject.port);
            updatedKeys.push({ 'CLIENT_PORT': newConfigObject.port });
            process.env.CLIENT_PORT = newConfigObject.port;
            console.log("Updated port to: ", newConfigObject.port);
        }
    }
    if (configKeys.includes("location")) {
        if (runningConfig.location != newConfigObject.location) {
            this.updateConfig('CLIENT_LOCATION', newConfigObject.location);
            updatedKeys.push({ 'CLIENT_LOCATION': newConfigObject.location });
            process.env.CLIENT_LOCATION = newConfigObject.location;
            console.log("Updated location to: ", newConfigObject.location);
        }
    }

    return updatedKeys;
}

/**
 * 
 * @param {string} key The config file key to update with the value
 * @param {string} value The value to update the key with 
 */
export function updateConfig (key, value) {
    const options = new Options(key, value);

    console.log("Options:", options);

    updateConfigFile(options, (updatedFiles) => {
        // Do Something
    })
}

/**
 * Wrapper to write changes to the file
 * @param options An instance of the Objects class specified to the key being updated
 * @param callback Callback when the files have been modified
 */
function updateConfigFile(options, callback) {
    replace(options, (error, changedFiles) => {
        if (error) return console.error('Error occurred:', error);
        console.log('Updated config file: ', changedFiles);
        callback(changedFiles);
    });
}