Libation/Source/LibationCli/Options/ScanOptions.cs

using ApplicationServices;
using AudibleUtilities;
using CommandLine;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace LibationCli;

[Verb("scan", HelpText = "Scan library. Default: scan all accounts. Optional: use 'account' flag to specify a single account.")]
public class ScanOptions : OptionsBase
{
	[Value(0, MetaName = "Accounts", HelpText = "Optional: user ID or nicknames of accounts to scan.", Required = false)]
	public IEnumerable<string>? AccountNames { get; set; }

	protected override async Task ProcessAsync()
	{
		var accounts = getAccounts();
		if (!accounts.Any())
		{
			Console.WriteLine("No accounts. Exiting.");
			Environment.ExitCode = (int)ExitCode.RunTimeError;
			return;
		}

		var _accounts = accounts.ToArray();

		var intro
			= (_accounts.Length == 1)
			? "Scanning Audible library. This may take a few minutes."
			: $"Scanning Audible library: {_accounts.Length} accounts. This may take a few minutes per account.";
		Console.WriteLine(intro);

		var (TotalBooksProcessed, NewBooksAdded) = await LibraryCommands.ImportAccountAsync(_accounts);

		Console.WriteLine("Scan complete.");
		Console.WriteLine($"Total processed: {TotalBooksProcessed}");
		Console.WriteLine($"New: {NewBooksAdded}");
	}

	private Account[] getAccounts()
	{
		using var persister = AudibleApiStorage.GetAccountsSettingsPersister();
		var allAccounts = persister.AccountsSettings.GetAll().ToArray();

		if (AccountNames?.Any() is not true)
			return allAccounts;

		var accountNames = AccountNames.Select(n => n.ToLower()).ToArray();

		var found
			= allAccounts
			.Where(acct => accountNames.Contains(acct.AccountName?.ToLower()) || accountNames.Contains(acct.AccountId.ToLower()))
			.ToArray();

		var notFound = allAccounts.Except(found).ToArray();

		// no accounts found. do not continue
		if (!found.Any())
		{
			Console.WriteLine("Accounts not found:");
			foreach (var nf in notFound)
				Console.WriteLine($"- {nf}");
			return found;
		}

		// some accounts not found. continue after message
		if (notFound.Any())
		{
			Console.WriteLine("Accounts found:");
			foreach (var f in found)
				Console.WriteLine($"- {f}");
			Console.WriteLine("Accounts not found:");
			foreach (var nf in notFound)
				Console.WriteLine($"- {nf}");
		}

		// else: all accounts area found. silently continue

		return found;
	}
}