// Copyright 2018 the Deno authors. All rights reserved. MIT license.
import * as fbs from "gen/msg_generated";
import { flatbuffers } from "flatbuffers";
import * as dispatch from "./dispatch";

/**
 * Removes the named file or (empty) directory synchronously.
 * Would throw error if permission denied, not found, or
 * directory not empty.
 *
 *     import { removeSync } from "deno";
 *     removeSync("/path/to/empty_dir/or/file");
 */
export function removeSync(path: string): void {
  dispatch.sendSync(...req(path, false));
}

/**
 * Removes the named file or (empty) directory.
 * Would throw error if permission denied, not found, or
 * directory not empty.
 *
 *     import { remove } from "deno";
 *     await remove("/path/to/empty_dir/or/file");
 */
export async function remove(path: string): Promise<void> {
  await dispatch.sendAsync(...req(path, false));
}

/**
 * Recursively removes the named file or directory synchronously.
 * Would throw error if permission denied or not found
 *
 *     import { removeAllSync } from "deno";
 *     removeAllSync("/path/to/dir/or/file");
 */
export function removeAllSync(path: string): void {
  dispatch.sendSync(...req(path, true));
}

/**
 * Recursively removes the named file or directory.
 * Would throw error if permission denied or not found
 *
 *     import { removeAll } from "deno";
 *     await removeAll("/path/to/dir/or/file");
 */
export async function removeAll(path: string): Promise<void> {
  await dispatch.sendAsync(...req(path, true));
}

function req(
  path: string,
  recursive: boolean
): [flatbuffers.Builder, fbs.Any, flatbuffers.Offset] {
  const builder = new flatbuffers.Builder();
  const path_ = builder.createString(path);
  fbs.Remove.startRemove(builder);
  fbs.Remove.addPath(builder, path_);
  fbs.Remove.addRecursive(builder, recursive);
  const msg = fbs.Remove.endRemove(builder);
  return [builder, fbs.Any.Remove, msg];
}