import { intersection, difference } from "lodash";

import { FirebaseError } from "./error";

import { Options } from "./options";

/**

* Filters targets from options with valid targets as specified.

* @param options CLI options.

* @param validTargets Targets that are valid.

* @return List of targets as specified and filtered by options and validTargets.

*/

export function filterTargets(options: Options, validTargets: string[]): string[] {

let targets = validTargets.filter((t) => {

return options.config.has(t);

});

if (options.only) {

targets = intersection(

targets,

options.only.split(",").map((opt: string) => {

return opt.split(":")[0];

}),

);

} else if (options.except) {

targets = difference(targets, options.except.split(","));

}

if (targets.length === 0) {

let msg = "Cannot understand what targets to deploy/serve.";

if (options.only) {

msg += ` No targets in firebase.json match '--only ${options.only}'.`;

} else if (options.except) {

msg += ` No targets in firebase.json match '--except ${options.except}'.`;

}

if (process.platform === "win32") {

msg +=

' If you are using PowerShell make sure you place quotes around any comma-separated lists (ex: --only "functions,firestore").';

}

throw new FirebaseError(msg);

}

return targets;

}