config.ts

import * as process from "process";
import DB from "./db";
import Robot from "./robot";

// const CONFIG_COLLECTION = "config"

export default class Config {
  private db: DB;
  private robot: Robot;
  private loadedConfig: {[key: string]: any} = {};
  private defaultConfig: {[key: string]: any} = {};

  constructor(robot: Robot, db: DB, defaultConfig?: {[key: string]: any}) {
    this.robot = robot;
    this.db = db;
    this.defaultConfig = defaultConfig;
  }

  public async init() {
    await this.refreshConfig();
    await this.setDefaultConfig();
  }

  public async refreshConfig() {
    this.loadedConfig = await this.db.getConfig();
  }

  public requireKeys(...keys) {
    for (let key of keys) {
      this.get(key);
    }
  }

  public async set(key: string, value: any) {
    const config = await this.db.getConfig();
    config[key] = value;
    await this.db.setConfig(config);
    await this.refreshConfig();
  }

  public async setDefaultConfig() {
    if (this.loadedConfig && Object.keys(this.loadedConfig).length > 0) {
      this.robot.logger.error(
        "[config] Not setting default config since there is config data already there"
      );
      return;
    }
    // eslint-disable-next-line @typescript-eslint/no-var-requires
    const exampleConfig = require("../configuration.example.json");
    await this.db.setConfig(exampleConfig);

    for (let key of Object.keys(exampleConfig)) {
      console.log("Loading default", key, exampleConfig[key]);
    }
  }

  // Fetch a config variable. Picks environment variables, then config file variables, then
  public get(key: string, defaultValue: any = undefined) {
    if (process.env[key] !== undefined) {
      return process.env[key];
    } else if (this.loadedConfig[key] !== undefined) {
      return this.loadedConfig[key];
    } else if (this.defaultConfig && this.defaultConfig[key] !== undefined) {
      return this.defaultConfig[key];
    } else if (defaultValue !== undefined) {
      return defaultValue;
    } else {
      throw new Error(`Cannot find config variable: ${key}`);
    }
  }
}