export enum NodeEnv {
  Production = "production",
  Development = "development"
}

export enum OcastEnv {
  Altair = "altair",
  Development = "development",
  Staging = "stage",
  Production = "production"
}

/**
 * Build options that may be customized freely depending on what kind of build you want to produce,
 * whether it's about customizing your developer experience or fine tuning a deployed build.
 */
export type BuildOptions = {
  outputFolder?: string;
  sourceMaps?: boolean;
  hashFilenames?: boolean;
  log?: boolean;
  debug?: boolean;
  cache?: boolean;
  compress?: boolean;
  minify?: boolean;
  hmr?: boolean;
};

/**
 * Returns the most commonly used options depending on the node and ocast environment.
 * NOTE Do not change these defaults for your personal preference. Extend the options object that is returned.
 */
export function getCommonBuildOptions (ocastEnv: OcastEnv, nodeEnv: NodeEnv): BuildOptions {
  const inProd = ocastEnv === OcastEnv.Production && nodeEnv === NodeEnv.Production;
  const inDev = !inProd;
  return {
    outputFolder: "dist",
    hashFilenames: inProd,
    compress: inProd,
    minify: inProd,
    sourceMaps: inDev,
    log: inDev,
    debug: inDev,
    hmr: inDev,
    cache: inDev
  };
}

/**
 * Gets the OcastEnv and NodeEnv defined in the systems environment variables.
 * - If an invalid configuration is found an error will be thrown.
 * - Defaults to Development if nothing is configured.
 * - Allows you to pass in your own environment strings. Useful for parsing CLI arguments.
 * @returns {{ocastEnv: OcastEnv | OcastEnv.Development; nodeEnv: NodeEnv | NodeEnv.Development}}
 */
export function getEnvironments (
  ocastEnvString = process.env.OCAST_CONFIG,
  nodeEnvString = process.env.NODE_ENV
) {
  const ocastEnv = ocastEnvString ? OcastEnv[ocastEnvString as any] as OcastEnv : OcastEnv.Development;
  const nodeEnv = nodeEnvString ? OcastEnv[nodeEnvString as any] as NodeEnv : NodeEnv.Development;

  if (Object.values(OcastEnv).indexOf(ocastEnv) === -1) {
    throw new Error(`Unknown OcastEnv: ${ocastEnv}. Supported values: ${Object.values(OcastEnv)}`);
  }

  if (Object.values(NodeEnv).indexOf(nodeEnv) === -1) {
    throw new Error(`Unknown NodeEnv: ${nodeEnv}. Supported values: ${Object.values(NodeEnv)}`);
  }

  return {ocastEnv, nodeEnv};
}