folder structure fixes
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# AGENTS.md
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This file provides guidance to AI agent when working with code in this repository.
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## Project Overview
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Wino Mail is a native Windows mail client (Windows 10 1809+ / Windows 11) replacing the deprecated Windows Mail & Calendar. It's **transitioning from UWP to WinUI 3** - always work with WinUI projects (Wino.Mail.WinUI), never edit the deprecated Wino.Mail UWP project.
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## Build and Development Commands
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```bash
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# Open solution
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# WinoMail.slnx is the main solution file (VS 2022+)
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# Build WinUI project (Debug x64)
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dotnet restore Wino.Mail.WinUI/Wino.Mail.WinUI.csproj --configfile nuget.config -p:Platform=x64 -p:RuntimeIdentifier=win-x64 && dotnet build Wino.Mail.WinUI/Wino.Mail.WinUI.csproj -c Debug --no-restore /p:Platform=x64 /p:RuntimeIdentifier=win-x64 /p:GenerateAppxPackageOnBuild=false /p:AppxPackageSigningEnabled=false
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# Run tests (Debug x64)
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dotnet test Wino.Core.Tests/Wino.Core.Tests.csproj -c Debug /p:Platform=x64
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# Copilot CLI build command (Debug x64)
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dotnet restore Wino.Mail.WinUI/Wino.Mail.WinUI.csproj --configfile nuget.config -p:Platform=x64 -p:RuntimeIdentifier=win-x64 && dotnet build Wino.Mail.WinUI/Wino.Mail.WinUI.csproj -c Debug --no-restore /p:Platform=x64 /p:RuntimeIdentifier=win-x64 /p:GenerateAppxPackageOnBuild=false /p:AppxPackageSigningEnabled=false
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```
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**Prerequisites:** Visual Studio 2022+ with ".NET desktop development" workload, .NET SDK 10+
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**Startup project:** Wino.Mail.WinUI
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**Platforms:** x86, x64, ARM64
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## Architecture
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### Solution Structure
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```
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Wino.Core.Domain → Entities, interfaces, translations, enums (shared contracts)
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Wino.Core → Synchronization engine, authenticators, request processing
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Wino.Services → Database, mail, folder, account services
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Wino.Authentication → OAuth2 authenticators (Outlook, Gmail)
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Wino.Mail.ViewModels → Mail-specific ViewModels
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Wino.Core.ViewModels → Shared ViewModels (settings, personalization)
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Wino.Messaging → Pub-sub message definitions
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Wino.Mail.WinUI → **Active WinUI 3 UI project** (use this)
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Wino.Mail → **Deprecated UWP project** (DO NOT EDIT)
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```
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### Mail Synchronization Flow
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1. **WinoRequestDelegator** → Validates and delegates user actions (mark read, delete, move)
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2. **WinoRequestProcessor** → Batches requests using RequestComparer, queues to synchronizers
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3. **Synchronizers** (OutlookSynchronizer, GmailSynchronizer, ImapSynchronizer) → Execute batched operations
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4. **ChangeProcessors** → Apply changes to local SQLite database
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5. Database updates trigger **Messenger** events (MailAddedMessage, MailUpdatedMessage, etc.)
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### Synchronizer Types
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- **OutlookSynchronizer** - Microsoft Graph SDK for Office 365
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- **GmailSynchronizer** - Gmail API
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- **ImapSynchronizer** - MimeKit/MailKit for IMAP/SMTP
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### Queue-Based Sync Pattern
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- Initial sync queues mail IDs first (MailItemQueue table), downloads metadata only
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- MIME content downloaded on-demand when user opens mail
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- Check `MailItemFolder.IsInitialSyncCompleted` for sync state
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- See QUEUE_SYNC_IMPLEMENTATION.md for details
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### Dependency Injection
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- `RegisterCoreServices()` in Wino.Core/CoreContainerSetup.cs
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- `RegisterSharedServices()` in Wino.Services/ServicesContainerSetup.cs
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- ViewModels registered in App.xaml.cs
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## Key Patterns
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### MVVM with Source Generators
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**CORRECT - use public partial properties:**
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```csharp
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[ObservableProperty]
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public partial string SearchQuery { get; set; } = string.Empty;
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```
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**WRONG - will not work:**
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```csharp
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[ObservableProperty]
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private string searchQuery = string.Empty;
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```
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### Messenger Pattern
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- ViewModels inherit from CoreBaseViewModel or MailBaseViewModel
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- Register handlers in `RegisterRecipients()`, unregister in `UnregisterRecipients()`
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- Send via `WeakReferenceMessenger.Default.Send(new MessageType(...))`
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### Data Binding - No Converters
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- **NEVER** create IValueConverter classes
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- WinUI 3 auto-converts bool to Visibility: `Visibility="{x:Bind IsVisible, Mode=OneWay}"`
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- Use XamlHelpers for complex conversions: `{x:Bind helpers:XamlHelpers.ReverseBoolToVisibilityConverter(Prop)}`
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## Localization
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1. Add English strings ONLY to `Wino.Core.Domain/Translations/en_US/resources.json`
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2. Build project - source generators create Translator properties
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3. Use `Translator.{PropertyName}` in code/XAML
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4. **NEVER** edit other language files - Crowdin manages translations
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## Storage
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- **SQLite database** in publisher cache folder (shared with future Wino Calendar)
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- **EML files** in app local storage, referenced by `MailCopy.FileId`
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- Paths resolved via `MimeFileService.GetMimeMessagePath()`
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## WebView2 Mail Rendering
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- `reader.html` for reading mails, `editor.html` for composing (Jodit editor)
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- Virtual host mapping: `https://wino.mail/reader.html`
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- JavaScript interop via `ExecuteScriptFunctionAsync()`
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- MIME content downloaded on-demand, not during sync
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## Common Pitfalls
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- Forgetting to register ViewModels in App.xaml.cs `RegisterViewModels()`
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- Not calling `RegisterRecipients()` for message handlers
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- Using private fields with `[ObservableProperty]` instead of public partial
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- Creating IValueConverter classes instead of using XamlHelpers
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- Editing UWP project files instead of WinUI equivalents
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- Hardcoding strings instead of using Translator
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- Forgetting to unregister Messenger recipients (memory leaks)
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## Code Style
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- Avoid introducing new NuGet packages when possible
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- Use existing libraries (MimeKit, MailKit, Microsoft Graph, Gmail API)
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- Use `var` where type is obvious
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- String interpolation over string.Format
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- Wrap async operations in try-catch
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- Log errors via IWinoLogger
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- In ViewModels, update all UI-bound properties/collections via `ExecuteUIThread(...)` (especially after awaited calls and any use of `ConfigureAwait(false)`).
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