# 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 browser-facing proxy controller for `api/track/*` (metadata listing and audio streaming), 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). Pages include the public `/about` editorial page (`Pages/About.razor` — three-movement **"Liner Notes"** editorial treatment: numbered left-rail (oversized Bodoni numerals + vertical hairline spine + mono marginalia captions), asymmetric content column, pull-quotes breaking into the margin, hand-authored SVG waveform movement dividers (self-contained motif, not the live `WaveformVisualizer`), and stacked editorial definition list for CUTS/SESSIONS/MIXES; active-movement highlight via `about-rail.ts` IntersectionObserver interop; registered in `Layout/Pages.cs`). Home hero stat row (`NowPlayingStats.razor`) is live-data-backed via `IStatsDataService` / `StatsClient` (named `"DeepDrft.API"` client) with a `PersistentComponentState` prerender bridge; `RuntimeFormat` helper converts mix runtime seconds to `hh:mm`. 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). Public entry point: `Components/Pages/Home.razor` (`@page "/"`, no `[Authorize]`, uses lean `CmsHomeLayout`) — unauthenticated visitors see a DeepDrft-branded splash with a Login CTA; authenticated admins are redirected to `/catalogue` via `RedirectToCatalogue`. The catalogue dashboard (`Components/Pages/Index.razor`) lives at `@page "/catalogue"` and remains `[Authorize]`-gated with `CmsLayout`; its cards are **CUTS / SESSIONS / MIXES**, each deep-linking to `/releases?medium=<medium>` with the matching tab pre-selected. The consolidated browse surface is `Components/Pages/Tracks/Releases.razor` (`@page "/releases"`): bulk-action buttons (Generate All Profiles / Backfill High-res) → medium tab strip (ALL / CUTS / SESSIONS / MIXES) → the active tab's grid; waveform columns (Profile / High-res) — each showing a status icon when a datum is present and an always-visible generate/regenerate button — and per-track info tooltip live in `CmsAlbumBrowser`'s expanded child-row track table. Old list routes `/tracks`, `/tracks/albums`, `/tracks/archive` are kept as aliases on `Releases.razor` so bookmarks don't 404; operational sub-routes (`/tracks/upload`, edit routes, etc.) remain at `/tracks/*`. Gated by AuthBlocks login and hierarchical `Admin` role authorization. All track operations (upload, metadata read/write, delete, replace audio) are HTTP proxies via `ICmsTrackService` / `CmsTrackService` injected directly into Blazor components; no in-process data layer. The per-track "Replace audio" affordance in `BatchEdit` / `BatchTrackList` / `BatchTrackDetail` swaps the vault bytes, regenerates both waveform datums server-side, and re-derives `DurationSeconds` from the new audio; the track id, `EntryKey`, release membership, position, and all other metadata are preserved. The remove control on a persisted track is hidden when it is the release's sole remaining persisted track — a release can reach zero live tracks only via replace or release-level delete, not per-track removal. Two named HttpClients: `DeepDrft.Content.Cms` (bounded 100 s default, for all non-upload calls) and `DeepDrft.Content.Cms.Upload` (`InfiniteTimeSpan`, for large WAV uploads). Upload progress and idle/heartbeat timeout are driven by a single `ProgressStreamContent` wrapper (`Services/ProgressStreamContent.cs`); `CmsTrackService.UploadTrackAsync` adds a two-phase cancellation (idle window resets per progress tick; separate response-wait budget arms when the body completes). The upload form is create-only: `BatchUpload.razor` calls `GET api/track/release/exists` as a pre-flight before transferring bytes and blocks the submit with a visible message if a (title, artist) match already exists; the server also rejects duplicates with 409. Within-batch multi-track Cuts still work by passing the release id from row 1 as `releaseId` on rows 2..N (the ATTACH path), while `BatchEdit.razor` uses the same ATTACH path for its legitimate adds-to-existing-release.
- **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` and tests.
- **DeepDrftAPI**: ASP.NET Core host. Dual-database authority (SQL metadata + FileDatabase binary). AuthBlocks API host (owns registration, migration/seed, JWT endpoints). Track endpoints: streaming, vault write, upload+persist, delete+cleanup, paged list with filters, single metadata (ApiKey-gated operations), metadata update, waveform profiles (512-bucket seeker + per-track high-res visualizer datum in the `track-waveforms` vault), release-track join operations, `POST api/track/duration/backfill` (ApiKey-gated one-time backfill of `DurationSeconds` for existing rows from vault audio). Stats endpoints: `GET api/stats/home` (unauthenticated; returns `HomeStatsDto` with cut track count, per-`ReleaseType` cut release counts, mix release count, and total mix runtime seconds). Release endpoints: paged list with medium filter, single read, session hero-image upload (all unauthenticated reads; authenticated writes via ApiKey). Image endpoints: authenticated upload, unauthenticated streaming.
- **DeepDrftContent**: Class library. The FileDatabase implementation in full (Models, Services, Utils, Abstractions, Constants), `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 proxy  ──►  DeepDrftAPI  ──►  EF Core / PostgreSQL (metadata)
    └── HttpClient "DeepDrft.Content" ──►  DeepDrftPublic proxy  ──►  DeepDrftAPI  ──►  FileDatabase / disk (binary)

Server-side (SSR): Both clients point directly at DeepDrftAPI (server-to-server, no proxy hop).
```

1. **SQL Database (PostgreSQL)**: Metadata and track info via Entity Framework
   - Connection string: Read from `environment/connections.json` via `CredentialTools.ResolvePathOrThrow("connections")` with key `ConnectionStrings:DefaultConnection`.
   - Entity: `TrackEntity` with `Id`, `EntryKey`, `TrackName`, `Artist`, `Album?`, `Genre?`, `ReleaseDate?`, `ImagePath?`, `DurationSeconds?`
   - 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}` with `Range: bytes={byteOffset}-`. Server streams raw bytes from that file-absolute offset with a `206 Partial Content` response. Player retains the parsed WAV header and feeds the raw PCM continuation into the existing decode pipeline.

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 `DeepDrftShared.Client/Common/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. A second interop module lives at `DeepDrftPublic/Interop/about/about-rail.ts` (IntersectionObserver for the About page active-movement rail highlight; compiled output gitignored).

**`DeepDrftShared.Client` also hosts TypeScript interop.** Its `tsconfig.json` maps `rootDir: "Interop"` → `outDir: "wwwroot/js"`, compiled by the same `Microsoft.TypeScript.MSBuild` package. Current modules: `Interop/parallax/parallax.ts` (parallax scroll for `ParallaxImage`) and `Interop/knob/knob.ts` (`capturePointer`/`releasePointer` for `RadialKnob`). Consumers lazy-import via the static-asset path `_content/DeepDrftShared.Client/js/<module>/<file>.js`.

## 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 DeepDrftAPI

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

## 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/api.json` (DeepDrftAPI base URL via `Api:ContentApiUrl`).
- `DeepDrftManager/appsettings.json`: Logging and URL config. Secrets loaded from `environment/api.json` (DeepDrftAPI base URL via `Api:ContentApiUrl` and API key via `Api:ContentApiKey`). Non-secret upload tunables (in `appsettings.json` itself, not `environment/`): `Upload:IdleTimeoutSeconds` (default 90 — aborts a stalled body-streaming phase) and `Upload:ResponseTimeoutSeconds` (default 1200 — budget for server-side persist after the body is fully sent).
- `DeepDrftAPI/appsettings.json`: Logging and hosting config. Non-secret upload tunable: `Upload:StagingPath` (default empty → a `staging` subdirectory under the FileDatabase vault path) — the data-disk directory where large audio bodies are staged during upload/replace-audio, kept off the system temp mount (`/tmp` is a small tmpfs on the Linux host); `Startup` also points the framework's multipart buffer here via `ASPNETCORE_TEMP`. 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 (PostgreSQL / Npgsql)
- 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.