Apply official naming guidelines to Octobot (#306)

1. The root namespace was changed from `Octobot` to
`TeamOctolings.Octobot`:
> DO prefix namespace names with a company name to prevent namespaces
from different companies from having the same name.
2. `Octobot.cs` was renamed to `Program.cs`:
> DO NOT use the same name for a namespace and a type in that namespace.
3. `IOption`, `Option` were renamed to `IGuildOption` and `GuildOption`
respectively:
> DO NOT introduce generic type names such as Element, Node, Log, and
Message.
4. `Utility` was moved out of the `Services` namespace. It didn't belong
there anyway
5. `Program` static fields were moved to `Utility`
6. Localisation files were moved back to the project source files. Looks
like this fixed `Message.Designer.cs` code generation

---------

Signed-off-by: Octol1ttle <l1ttleofficial@outlook.com>

TeamOctolings.Octobot/Services/GuildDataService.cs

@@ -0,0 +1,200 @@
+using System.Collections.Concurrent;
+using System.Text.Json;
+using System.Text.Json.Nodes;
+using Microsoft.Extensions.Hosting;
+using Microsoft.Extensions.Logging;
+using Remora.Rest.Core;
+using TeamOctolings.Octobot.Data;
+
+namespace TeamOctolings.Octobot.Services;
+
+/// <summary>
+///     Handles saving, loading, initializing and providing <see cref="GuildData" />.
+/// </summary>
+public sealed class GuildDataService : BackgroundService
+{
+    private readonly ConcurrentDictionary<Snowflake, GuildData> _datas = new();
+    private readonly ILogger<GuildDataService> _logger;
+
+    public GuildDataService(ILogger<GuildDataService> logger)
+    {
+        _logger = logger;
+    }
+
+    public override Task StopAsync(CancellationToken ct)
+    {
+        base.StopAsync(ct);
+        return SaveAsync(ct);
+    }
+
+    private Task SaveAsync(CancellationToken ct)
+    {
+        var tasks = new List<Task>();
+        var datas = _datas.Values.ToArray();
+        foreach (var data in datas.Where(data => !data.DataLoadFailed))
+        {
+            tasks.Add(SerializeObjectSafelyAsync(data.Settings, data.SettingsPath, ct));
+            tasks.Add(SerializeObjectSafelyAsync(data.ScheduledEvents, data.ScheduledEventsPath, ct));
+
+            var memberDatas = data.MemberData.Values.ToArray();
+            tasks.AddRange(memberDatas.Select(memberData =>
+                SerializeObjectSafelyAsync(memberData, $"{data.MemberDataPath}/{memberData.Id}.json", ct)));
+        }
+
+        return Task.WhenAll(tasks);
+    }
+
+    private static async Task SerializeObjectSafelyAsync<T>(T obj, string path, CancellationToken ct)
+    {
+        var tempFilePath = path + ".tmp";
+        await using (var tempFileStream = File.Create(tempFilePath))
+        {
+            await JsonSerializer.SerializeAsync(tempFileStream, obj, cancellationToken: ct);
+        }
+
+        File.Copy(tempFilePath, path, true);
+        File.Delete(tempFilePath);
+    }
+
+    protected override async Task ExecuteAsync(CancellationToken ct)
+    {
+        using var timer = new PeriodicTimer(TimeSpan.FromMinutes(5));
+
+        while (await timer.WaitForNextTickAsync(ct))
+        {
+            await SaveAsync(ct);
+        }
+    }
+
+    public async Task<GuildData> GetData(Snowflake guildId, CancellationToken ct = default)
+    {
+        return _datas.TryGetValue(guildId, out var data) ? data : await InitializeData(guildId, ct);
+    }
+
+    private async Task<GuildData> InitializeData(Snowflake guildId, CancellationToken ct = default)
+    {
+        var path = $"GuildData/{guildId}";
+        var memberDataPath = $"{path}/MemberData";
+        var settingsPath = $"{path}/Settings.json";
+        var scheduledEventsPath = $"{path}/ScheduledEvents.json";
+
+        MigrateDataDirectory(guildId, path);
+
+        Directory.CreateDirectory(path);
+
+        if (!File.Exists(settingsPath))
+        {
+            await File.WriteAllTextAsync(settingsPath, "{}", ct);
+        }
+
+        if (!File.Exists(scheduledEventsPath))
+        {
+            await File.WriteAllTextAsync(scheduledEventsPath, "{}", ct);
+        }
+
+        var dataLoadFailed = false;
+
+        await using var settingsStream = File.OpenRead(settingsPath);
+        JsonNode? jsonSettings = null;
+        try
+        {
+            jsonSettings = await JsonNode.ParseAsync(settingsStream, cancellationToken: ct);
+        }
+        catch (Exception e)
+        {
+            _logger.LogError(e, "Guild settings load failed: {Path}", settingsPath);
+            dataLoadFailed = true;
+        }
+
+        if (jsonSettings is not null)
+        {
+            FixJsonSettings(jsonSettings);
+        }
+
+        await using var eventsStream = File.OpenRead(scheduledEventsPath);
+        Dictionary<ulong, ScheduledEventData>? events = null;
+        try
+        {
+            events = await JsonSerializer.DeserializeAsync<Dictionary<ulong, ScheduledEventData>>(
+                eventsStream, cancellationToken: ct);
+        }
+        catch (Exception e)
+        {
+            _logger.LogError(e, "Guild scheduled events load failed: {Path}", scheduledEventsPath);
+            dataLoadFailed = true;
+        }
+
+        var memberData = new Dictionary<ulong, MemberData>();
+        foreach (var dataFileInfo in Directory.CreateDirectory(memberDataPath).GetFiles())
+        {
+            await using var dataStream = dataFileInfo.OpenRead();
+            MemberData? data;
+            try
+            {
+                data = await JsonSerializer.DeserializeAsync<MemberData>(dataStream, cancellationToken: ct);
+            }
+            catch (Exception e)
+            {
+                _logger.LogError(e, "Member data load failed: {MemberDataPath}/{FileName}", memberDataPath,
+                    dataFileInfo.Name);
+                dataLoadFailed = true;
+                continue;
+            }
+
+            if (data is null)
+            {
+                continue;
+            }
+
+            memberData.Add(data.Id, data);
+        }
+
+        var finalData = new GuildData(
+            jsonSettings ?? new JsonObject(), settingsPath,
+            events ?? new Dictionary<ulong, ScheduledEventData>(), scheduledEventsPath,
+            memberData, memberDataPath,
+            dataLoadFailed);
+
+        _datas.TryAdd(guildId, finalData);
+
+        return finalData;
+    }
+
+    private void MigrateDataDirectory(Snowflake guildId, string newPath)
+    {
+        var oldPath = $"{guildId}";
+
+        if (Directory.Exists(oldPath))
+        {
+            Directory.CreateDirectory($"{newPath}/..");
+            Directory.Move(oldPath, newPath);
+
+            _logger.LogInformation("Moved guild data to separate folder: \"{OldPath}\" -> \"{NewPath}\"", oldPath,
+                newPath);
+        }
+    }
+
+    private static void FixJsonSettings(JsonNode settings)
+    {
+        var language = settings[GuildSettings.Language.Name]?.GetValue<string>();
+        if (language is "mctaylors-ru")
+        {
+            settings[GuildSettings.Language.Name] = "ru";
+        }
+    }
+
+    public async Task<JsonNode> GetSettings(Snowflake guildId, CancellationToken ct = default)
+    {
+        return (await GetData(guildId, ct)).Settings;
+    }
+
+    public ICollection<Snowflake> GetGuildIds()
+    {
+        return _datas.Keys;
+    }
+
+    public bool UnloadGuildData(Snowflake id)
+    {
+        return _datas.TryRemove(id, out _);
+    }
+}