import * as os from 'os';
import * as fs from 'fs';
import * as braces from 'braces';

declare module 'braces' {
	interface Options {
		keepEscaping?: boolean; // Workaround for option not present in @types/braces 3.0.0
	}
}

export function normalizeHomeDir(path: string): string {
	if (path.substring(0, 1) === '~') {
		return `${os.homedir()}/${path.substring(1)}`;
	}
	return path;
}

export function expandPattern(pattern: string): string[] {
	return braces(pattern, { expand: true, keepEscaping: true });
}

export function normalizePaths(patterns: string[], defaultPatterns: string[] = []): string[] {
	return patterns
		.map((pattern) =>
			expandPattern(pattern)
				.map((path) => {
					path = normalizeHomeDir(path);
					if (fs.existsSync(path) && fs.statSync(path).isDirectory()) {
						return defaultPatterns.map((defaultPattern) => path + defaultPattern);
					}
					return path;
				})
				.flat()
		)
		.flat();
}