# CLAUDE.md

This file provides guidance to Claude Code when working with code in this repository.

## Architecture Overview

DeepDrftHome is a **net10.0** solution consisting of ten projects implementing a dual-database media management system for the DeepDrft electronic music collective, split into two independent Blazor applications: the public site (`DeepDrftPublic`) and the CMS (`DeepDrftManager`).

### Core Projects

- **DeepDrftPublic**: ASP.NET Core host. Blazor Web App with Server + WASM render modes. Owns the SQL-backed `api/track/page` endpoint, MudBlazor theme prerender, and TypeScript→JS audio interop. Public-facing site for listeners.
- **DeepDrftPublic.Client**: Blazor WebAssembly assembly. All interactive UI (pages, player stack, dark-mode plumbing, HTTP clients for both backends). Consumed by the public site.
- **DeepDrftManager**: ASP.NET Core host. Blazor Web App with server-rendered `InteractiveServer` render mode. Hosts all CMS Razor components and pages under `Components/Pages/Cms/`, `Components/Pages/Tracks/`, `Components/Layout/CmsLayout.razor`, and `Components/Shared/` (all inlined from the former `DeepDrftCms` RCL). Gated by AuthBlocks login and hierarchical `Admin` role authorization. All track operations (upload, metadata read/write, delete) are HTTP proxies via `ICmsTrackService` / `CmsTrackService` injected directly into Blazor components; no in-process data layer.
- **DeepDrftShared.Client**: Razor Class Library. Shared Blazor components consumed by both `DeepDrftPublic` and `DeepDrftManager` for consistency across public and admin surfaces.
- **DeepDrftData**: Class library. EF Core domain logic: `DeepDrftContext`, `TrackConfiguration`, `Migrations`, `TrackRepository`, `TrackService`, `TrackManager`. Consumed by `DeepDrftAPI`, `DeepDrftPublic`, and tests.
- **DeepDrftAPI**: ASP.NET Core host. Dual-database authority (SQL metadata + FileDatabase binary). AuthBlocks API host (owns registration, migration/seed, JWT endpoints). Seven track endpoints: `GET api/track/{id}` unauthenticated streaming; `PUT api/track/{id}` vault write (ApiKey); `POST api/track/upload` upload + SQL persist (ApiKey); `DELETE api/track/{id:long}` SQL delete + vault remove (ApiKey); `GET api/track/page` paged metadata list (ApiKey); `GET api/track/meta/{id:long}` single metadata (ApiKey); `PUT api/track/meta/{id:long}` metadata update (ApiKey).
- **DeepDrftContent**: Class library. The FileDatabase implementation in full (Models, Services, Utils, Abstractions, Constants), `WavOffsetService`, `AudioProcessor`, content-side `TrackService`. Consumed by hosts and tests.
- **DeepDrftModels**: Shared contracts. `TrackEntity`, `TrackDto`, `PagingParameters<T>`, `PagedResult<T>`. Every project references this.
- **DeepDrftTests**: NUnit test suite. Comprehensive FileDatabase tests (vault creation, media storage, indexing, factory patterns, utilities). Integration-focused with temp-directory test isolation.

External: **NetBlocks** (absolute path `C:\lib\NetBlocks\`). Provides `Result`, `ResultContainer<T>`, `ApiResult<T>`, `ApiResultDto<T>`.

### Database Architecture

**Dual-database approach** — browser never reaches storage directly:

```
DeepDrftPublic.Client (WASM)
    ├── HttpClient "DeepDrft.API"     ──►  DeepDrftPublic host ──►  EF Core / SQLite (metadata)
    └── HttpClient "DeepDrft.Content" ──►  DeepDrftContent     ──►  FileDatabase / disk (binary)
```

1. **SQL Database (SQLite)**: Metadata and track info via Entity Framework
   - Location: `../Database/deepdrft.db`
   - Entity: `TrackEntity` with `Id`, `EntryKey`, `TrackName`, `Artist`, `Album?`, `Genre?`, `ReleaseDate?`, `ImagePath?`
   - Context: `DeepDrftContext` in `DeepDrftData`

2. **FileDatabase**: Custom file-based binary storage system
   - Location: `../Database/Vaults` (configurable via `filedatabase.json`)
   - Root contains typed **MediaVaults** (Media, Image, Audio)
   - Each vault has a JSON `index` file listing entries + per-entry metadata
   - Entries are user-supplied strings sanitized to `[a-zA-Z0-9-]` + file extension
   - Binary hierarchy: `FileBinary` → `MediaBinary` (+ Extension/MIME) → `AudioBinary` (+ Duration/Bitrate) | `ImageBinary` (+ AspectRatio)
   - **Error-handling philosophy**: public operations swallow exceptions and return `null`/`false` — callers must check return values, not catch.

## Key Architectural Decisions

### Service projects vs. host projects

The split between host projects (`DeepDrftPublic`, `DeepDrftManager`, `DeepDrftContent`) and `*.Services` class libraries (e.g., `DeepDrftData`, `DeepDrftContent.Services`) is deliberate: hosts own HTTP surface (endpoints/controllers exposed to network), config, DI wiring, and UI components; `*.Services` are plain class libraries holding domain logic. This separation allows multiple hosts to consume the same service implementations. Within a host, domain logic like CMS mutations lives in host-internal service classes (e.g., `CmsTrackService` in `DeepDrftManager/Services/`), injected directly into Blazor components with no in-process HTTP roundtrip.

**New domain logic goes in `*.Services` (shared class libraries) for logic consumed by multiple hosts, or in host-internal service classes (e.g., `Services/`) for host-specific logic** — not in controllers, which should be thin HTTP boundaries.

### TrackEntity is a join, not a content blob

`TrackEntity` holds *only* metadata. The link to binary content is `EntryKey` (string) — the entry id inside the `tracks` vault in FileDatabase. Dual-database add flow:

1. `DeepDrftContent.TrackService.AddTrackFromWavAsync` processes WAV, generates entry GUID, stores audio in vault, returns unpersisted `TrackEntity`.
2. `DeepDrftAPI.Services.UnifiedTrackService.UploadAsync` persists the entity to SQL via `DeepDrftData.TrackManager` and returns the persisted entity with `Id`.

If step 1 succeeds and step 2 fails, audio is orphaned in the vault (no rollback today).

### Streaming-first audio playback

The player is not fetch-then-play:

1. Client calls `GET api/track/{id}` on DeepDrftContent and receives WAV bytes as a stream (`HttpCompletionOption.ResponseHeadersRead`).
2. `StreamingAudioPlayerService` reads in adaptive 16–64 KB chunks, pushes each via `AudioInteropService.processStreamingChunk`.
3. TypeScript `StreamDecoder` parses WAV header, decodes chunks to `AudioBuffer`s. `PlaybackScheduler` schedules them on a Web Audio graph.
4. Playback starts as soon as a min buffer is queued; UI duration from parsed header (not waiting for full file).
5. **Seek beyond buffer**: if seek target is past what's decoded, client issues `GET api/track/{id}?offset={byteOffset}`. Server's `WavOffsetService` block-aligns offset, synthesises a fresh 44-byte WAV header, streams `[new header][data from offset]`. Player tears down and re-initialises decoder for the new stream.

Keep this seam clean — it is the most architecturally load-bearing part of the playback path.

### Theming and dark mode

- MudBlazor is the UI framework. Light and dark palettes (bespoke "Charleston in the Day" / "Lowcountry Summer Nights") defined inline in `MainLayout.razor`.
- Dark mode toggles via cookie (`darkMode`, 365 days). Client-side via JS interop.
- During server prerender, `DarkModeService` (in `DeepDrftPublic`) reads the cookie and seeds `DarkModeSettings.IsDarkMode`, which carries into WASM render via `PersistentComponentState`. Avoids "wrong theme flash" on initial paint.
- `DarkModeSettings` lives in `DeepDrftPublic.Client.Common` (consumed by both server prerender and client components).
- Typography: Google Fonts (Bodoni Moda, Cormorant, DM Sans). Hand-rolled gas-lamp icon (lit/unlit) lives in `DDIcons.cs`.

### TypeScript interop, not raw JS

Audio interop authored in TypeScript under `DeepDrftPublic/Interop/audio/`, compiled to `wwwroot/js/audio/` via `Microsoft.TypeScript.MSBuild`. One module per responsibility (AudioContextManager, StreamDecoder, PlaybackScheduler, SpectrumAnalyzer, AudioPlayer), plus `index.ts` exposing `window.DeepDrftAudio`. `tsconfig.json` is **not** copied to output. In dev, raw `.ts` served from `/Interop/` for source-map debugging.

## Development Commands

### Build and Test
```bash
# Build entire solution
dotnet build DeepDrftHome.sln

# Run all tests
dotnet test DeepDrftTests/

# Run specific test class
dotnet test DeepDrftTests/ --filter "ClassName=FileDatabaseTests"
```

### Running Applications
```bash
# Run main web application
dotnet run --project DeepDrftPublic

# Run API (dual-database authority and AuthBlocks host)
dotnet run --project DeepDrftAPI
```

### Entity Framework (SQL Database)
```bash
# Add migration (from solution root)
dotnet ef migrations add MigrationName --project DeepDrftData --startup-project DeepDrftPublic

# Update database
dotnet ef database update --project DeepDrftData --startup-project DeepDrftPublic
```

## Key Configuration Files

All projects load secrets via `CredentialTools.ResolvePathOrThrow()` from gitignored `environment/` files:

- `DeepDrftPublic/appsettings.json`: Logging and URL config. Secrets loaded from `environment/connections.json` (SQL connection string).
- `DeepDrftManager/appsettings.json`: Logging and URL config. Secrets loaded from `environment/api.json` (DeepDrftAPI base URL and API key).
- `DeepDrftAPI/appsettings.json`: Logging and hosting config. Secrets loaded from `environment/filedatabase.json` (FileDatabase vault path), `environment/apikey.json` (API key), `environment/connections.json` (SQL and Auth connection strings), `environment/authblocks.json` (AuthBlocks JWT/email/admin creds).

## Folder-Level Guidance

Folder-level `CLAUDE.md` files provide specifics on structure, patterns, and commands for each project. Start with the project's folder `CLAUDE.md` when entering that directory. The root CLAUDE.md here sets the architectural context; folder files answer "what's in this folder and how do I work here?"

## Important Patterns

### Result Pattern (NetBlocks)

Services return `Result`, `ResultContainer<T>`, or `ApiResult<T>` rather than throwing for expected failure modes. Catch at service boundary, surface via result.

### Error Swallowing in FileDatabase

Public `Load*` / `Register*` operations in FileDatabase swallow exceptions and return `null` / `false`. Callers must check return values. This matches the TypeScript original and is load-bearing — do not change without a design pass.

### Pagination

Services build `PagingParameters<T>` with an `OrderBy` expression. Switch in the service maps a string sort column to the expression. New sort columns extend this switch. Nulls sort to end (padded sentinel strings / `DateOnly.MaxValue`).

## External Dependencies

- Entity Framework Core 10.0.1 (SQLite)
- MudBlazor 8.15.0
- NUnit 4.4.0
- NetBlocks (Result patterns)
- Microsoft.TypeScript.MSBuild (TS compilation)

See individual project files for detailed dependency lists and versions.