import * as Effect from "effect/Effect";

import type { PlatformFilter, PlatformTarget } from "@packall/core";
import { allPlatforms, parsePlatformTarget, platformTargets } from "@packall/core";

/**
 * Parses `--platform win32,linux`, `--platform "win32 linux"`, and
 * `--platform win32 --platform linux` — all to the same thing.
 *
 * Whitespace counts as a separator because PowerShell turns an unquoted
 * `win32,linux` into the single argument `"win32 linux"`: a comma builds an
 * array literal there, and arrays are space-joined on their way to a native
 * command. Accepting that costs nothing — no platform token contains a space —
 * and it means the obvious command works in the shell most of these users are
 * sitting in, rather than failing with a confusing quoting error.
 */
export const parsePlatforms = (
	inputs: ReadonlyArray<string>,
): Effect.Effect<PlatformFilter, Error> =>
	Effect.gen(function* () {
		const targets: Array<PlatformTarget> = [];
		const invalid: Array<string> = [];
		for (const input of inputs) {
			for (const piece of input.split(/[,\s]+/)) {
				const trimmed = piece.trim();
				if (trimmed.length === 0) continue;
				const target = parsePlatformTarget(trimmed);
				if (target === null) invalid.push(trimmed);
				else targets.push(target);
			}
		}

		if (invalid.length > 0) {
			return yield* Effect.fail(
				new Error(
					`Unrecognised --platform value(s): ${invalid.join(", ")}\n` +
						"  Expected <os>[-<cpu>][-<libc>], where <os> is one of aix, android, cygwin,\n" +
						"  darwin, freebsd, haiku, linux, netbsd, openbsd, sunos, win32.\n" +
						"  e.g. win32,linux (every arch) · linux-x64 · darwin-arm64 · linux-x64-musl",
				),
			);
		}

		return targets.length === 0 ? allPlatforms : platformTargets(targets);
	});