import { constants } from "node:fs";
import { access, readFile } from "node:fs/promises";
import { join } from "node:path";
import { glob } from "glob";

import type { FileInfo } from "../types/index.ts";

export { inspect } from "node:util";

/**
 * Asynchronously checks if a file exists
 * @param filePath The path to the file
 * @returns A promise that resolves to true if the file exists, false otherwise
 */
export const fileExists = async (filePath: string): Promise<boolean> => {
	try {
		await access(filePath, constants.F_OK);
		return true;
	} catch {
		return false;
	}
};

/**
 * Find a file in a list of directories
 * @param dirs The directories to search in
 * @param filename The filename to search for
 * @returns The file info
 */
export const findFilesInDirs = async (dirs: string[], filename: string): Promise<FileInfo[]> => {
	const filesInfo: FileInfo[] = [];

	const pattern = dirs.map((dir) => join(dir, filename));
	const _files = await glob(pattern);

	// Remove duplicates
	const files = [...new Set(_files)];

	for (const filePath of files) {
		const fileInfo: FileInfo = {
			path: null,
			filename,
			exists: false,
		};
		fileInfo.exists = await fileExists(filePath);
		if (fileInfo.exists) {
			fileInfo.path = filePath;
			filesInfo.push(fileInfo);
		}
	}

	if (filesInfo.length === 0) {
		filesInfo.push({
			path: null,
			filename,
			exists: false,
		});
	}

	return filesInfo;
};

/**
 * Read a JSON file
 * @param filePath The path to the JSON file
 * @returns The parsed JSON
 */
export const readJsonFile = async <T = unknown>(filePath: string): Promise<T> => {
	const fileContent = await readFile(filePath, "utf8");
	return JSON.parse(fileContent) as T;
};