import development from "./commons/environment/development.env";
import production from "./commons/environment/production.env";
import { Configuration } from "./loader/config";
import defaultConfig from "./loader/default.config";

/**
 * Main RecSys integration module.
 *
 * @export
 * @abstract
 * @class RecSys
 */
export default abstract class RecSys {
    /**
     * Initialization method. This needs to be run before using any of this
     * modules features.
     *
     * @static
     * @param {Configuration} config Store configuration.
     * @memberof RecSys
     */
    public static init(config: Configuration) {
        window._RecSys = window._RecSys || {};
        window._RecSys.Bundle = window._RecSys.Bundle; // eslint-disable-line

        const properties = this.env(config) === "production" ? production : development;

        window._RecSys.Bundle = {
            Properties: properties(config.store.slug),
            Configuration: this.mergeConfig(config),
            Version: "__version__",
            Environment: this.env(config),
        };
    }

    /**
     * Merge current configuration provided by the store with
     * the default configuration, filling in the blanks.
     *
     * @static
     * @param {Configuration} config Current configuration
     * @return {Configuration}
     * @memberof RecSys
     */
    public static mergeConfig(config: Configuration): Configuration {
        return Object.assign(defaultConfig, config);
    }

    /**
     * Environment running right now.
     * NOTE: This comes from `recsys build`.
     *
     * @private
     * @static
     * @param {Configuration} config Configuration
     * @return {string} Current environment
     * @memberof RecSys
     */
    private static env(config: Configuration): string {
        return config.environment || "__environment__";
    }
}