// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
import * as dntShim from "../../../../_dnt.shims.js";

import { join } from "../path/mod.js";
import { toPathString } from "./_util.js";

/**
 * Ensures that a directory is empty.
 * Deletes directory contents if the directory is not empty.
 * If the directory does not exist, it is created.
 * The directory itself is not deleted.
 * Requires the `--allow-read` and `--allow-write` flag.
 *
 * @example
 * ```ts
 * import { emptyDir } from "https://deno.land/std@$STD_VERSION/fs/mod.ts";
 *
 * emptyDir("./foo"); // returns a promise
 * ```
 */
export async function emptyDir(dir: string | URL) {
  try {
    const items = [];
    for await (const dirEntry of dntShim.Deno.readDir(dir)) {
      items.push(dirEntry);
    }

    while (items.length) {
      const item = items.shift();
      if (item && item.name) {
        const filepath = join(toPathString(dir), item.name);
        await dntShim.Deno.remove(filepath, { recursive: true });
      }
    }
  } catch (err) {
    if (!(err instanceof dntShim.Deno.errors.NotFound)) {
      throw err;
    }

    // if not exist. then create it
    await dntShim.Deno.mkdir(dir, { recursive: true });
  }
}

/**
 * Ensures that a directory is empty.
 * Deletes directory contents if the directory is not empty.
 * If the directory does not exist, it is created.
 * The directory itself is not deleted.
 * Requires the `--allow-read` and `--allow-write` flag.
 *
 * @example
 * ```ts
 * import { emptyDirSync } from "https://deno.land/std@$STD_VERSION/fs/mod.ts";
 *
 * emptyDirSync("./foo"); // void
 * ```
 */
export function emptyDirSync(dir: string | URL) {
  try {
    const items = [...dntShim.Deno.readDirSync(dir)];

    // If the directory exists, remove all entries inside it.
    while (items.length) {
      const item = items.shift();
      if (item && item.name) {
        const filepath = join(toPathString(dir), item.name);
        dntShim.Deno.removeSync(filepath, { recursive: true });
      }
    }
  } catch (err) {
    if (!(err instanceof dntShim.Deno.errors.NotFound)) {
      throw err;
    }
    // if not exist. then create it
    dntShim.Deno.mkdirSync(dir, { recursive: true });
  }
}