# eQuantic.UI Build Flow

This document describes the eQuantic.UI build flow, demonstrating how the framework maintains **zero external dependencies** for the consumer.

## Visual Flow

```
┌─────────────────────────────────────────────────────────────────────────────┐
│                           DEVELOPMENT (source tree)                         │
└─────────────────────────────────────────────────────────────────────────────┘

  reconciler.ts, component.ts, etc.
         │
         ▼
  ┌──────────────────────────────────┐
  │  npm run build                   │  (only during development)
  │  (eQuantic.UI.Runtime)           │
  └──────────────────────────────────┘
         │
         ▼
  dist/index.js (compiled runtime)
         │
         │
  boot.ts ──────imports────────┘
         │
         ▼
  ┌──────────────────────────────────┐
  │  dotnet build                    │
  │  (eQuantic.UI.Server)            │
  │                                  │
  │  ResolveBunForServer target:     │
  │  ├─ Looks for Bun in:            │
  │  │  Runtime.Osx64/tools/bun/     │
  │  │  Runtime.Win64/tools/bun/     │
  │  │  Runtime.Linux64/tools/bun/   │
  │  ├─ Extracts from .zip if needed │
  │  └─ chmod +x (Unix)              │
  │                                  │
  │  BundleRuntime target:           │
  │  └─ "$(_BunPath)" build boot.ts  │
  └──────────────────────────────────┘
         │
         ▼
  wwwroot/runtime.js (embedded in Server.dll)
         │
         ▼
  ┌──────────────────────────────────┐
  │  dotnet pack                     │
  │  (eQuantic.UI.Server)            │
  └──────────────────────────────────┘
         │
         ▼
  artifacts/packages/eQuantic.UI.Server.0.1.1.nupkg


┌─────────────────────────────────────────────────────────────────────────────┐
│                        CONSUMER (client project)                            │
└─────────────────────────────────────────────────────────────────────────────┘

  MyApp.csproj
  ├─ Sdk="eQuantic.UI.Sdk/0.1.1"
  └─ PackageReference: eQuantic.UI.Server, eQuantic.UI.Runtime

         │
         ▼
  ┌──────────────────────────────────┐
  │  dotnet restore                  │
  │                                  │
  │  NuGet installs packages:        │
  │  ├─ eQuantic.UI.Sdk              │
  │  ├─ eQuantic.UI.Server           │
  │  ├─ eQuantic.UI.Runtime          │
  │  │  └─ (meta-package)            │
  │  └─ eQuantic.UI.Runtime.Osx64    │  ◄── Bun embedded here!
  │     └─ tools/bun/bun-darwin.zip  │
  └──────────────────────────────────┘
         │
         ▼
  ┌──────────────────────────────────┐
  │  dotnet build                    │
  │                                  │
  │  SDK.targets executes:           │
  │                                  │
  │  1. ResolveBunZipPath            │
  │     └─ $(PkgeQuantic_UI_Runtime_ │
  │        Osx64)/tools/bun/*.zip    │
  │                                  │
  │  2. EnsureBunExtracted           │
  │     ├─ Unzip if needed           │
  │     └─ chmod +x (Unix)           │
  │                                  │
  │  3. ResolveBunPath               │
  │     └─ Defines $(BunPath)        │
  │                                  │
  │  4. InstallBunPackages           │
  │     ├─ <BunPackage> → bun add   │
  │     └─ Symlink node_modules      │
  │                                  │
  │  5. CompileEQuanticUI            │
  │     └─ dotnet eqc.dll ... --bun  │
  │        "$(BunPath)"              │
  │                                  │
  │  6. CopyEQuanticRuntime          │  ◄── Runtime.js deployment
  │     └─ Copy from Runtime package │
  │        to wwwroot/_equantic/     │
  │                                  │
  │     └─ "$(BunPath)" x            │
  └──────────────────────────────────┘
         │
         ▼
  wwwroot/_equantic/
  ├─ runtime.js (from Runtime package)
  └─ *.js (compiled components)
         │
         ▼
  ┌──────────────────────────────────┐
  │  dotnet run                      │
  │                                  │
  │  Server serves:                  │
  │  ├─ runtime.js (from Server.dll) │
  │  └─ *.js (from wwwroot/_equantic)│
  └──────────────────────────────────┘
         │
         ▼
  Browser loads application
```

## Bun Source by Component

| Component                  | Bun Source                                                |
| -------------------------- | --------------------------------------------------------- |
| **Server** (package build) | `eQuantic.UI.Runtime.{OS}/tools/bun/` (source tree)       |
| **SDK** (consumer)         | `$(PkgeQuantic_UI_Runtime_{OS})/tools/bun/` (NuGet cache) |

## Consumer Requirements

The consumer only needs:

- .NET SDK 10.0
- `dotnet restore` + `dotnet build`

**No Node.js, npm, or global Bun installation required.**

## Key Files

| File                  | Responsibility                                                   |
| --------------------- | ---------------------------------------------------------------- |
| `Sdk/Sdk.targets`     | Resolves Bun, installs `<BunPackage>` items, compiles components |
| `Server.csproj`       | Resolves Bun from source tree, bundles runtime.js                |
| `Runtime.{OS}.csproj` | Packages Bun executable for each platform                        |

## MSBuild Targets (Execution Order)

### In SDK (consumer)

1. **ResolveBunZipPath** - Finds the Bun .zip in NuGet cache
2. **EnsureBunExtracted** - Extracts the executable if needed
3. **ResolveBunPath** - Defines `$(BunPath)` for later use
4. **InstallBunPackages** - Installs `<BunPackage>` items via `bun add` (see [BunPackage](BunPackage))
5. **CompileEQuanticUI** - Transpiles C# → TypeScript → JavaScript
6. **CopyEQuanticRuntime** - Copies runtime.js from Runtime package to wwwroot/\_equantic/

### In Server (development)

1. **ResolveBunForServer** - Finds Bun in source tree
2. **BundleRuntime** - Compiles boot.ts → runtime.js

## Package Architecture & Self-Containment

eQuantic.UI follows a **self-contained package architecture** where each package manages its own artifacts. The SDK acts as an orchestrator, referencing other packages via NuGet's `$(Pkg*)` properties.

### Architecture Principles

**Before (Problematic):**

```
SDK Package ❌
├─ Embedded runtime.js (copied from Runtime)
└─ Embedded *.cs files (copied from Components)
```

Problems: tight coupling, version conflicts, artifact duplication

**After (Correct):**

```
Runtime Package ✅
└─ tools/runtime/runtime.js (self-contained)

Components Package ✅
└─ tools/source/*.cs (self-contained)

SDK Package ✅
└─ References other packages via $(PkgeQuantic_UI_*)
```

Benefits: decoupling, correct versioning, no duplication

### Runtime.js Deployment

**1. Packaging (Development)**

During `dotnet pack` of **eQuantic.UI.Runtime**:

```xml
<!-- eQuantic.UI.Runtime.csproj -->
<ItemGroup>
  <Content Include="dist\index.js" PackagePath="tools\runtime\runtime.js"
           Condition="Exists('dist\index.js')" />
</ItemGroup>
```

The Runtime package embeds its own compiled JavaScript artifact.

**2. Deployment (Consumer Build)**

During `dotnet build`, the SDK's **CopyEQuanticRuntime** target executes:

```xml
<!-- Sdk/Sdk.targets -->
<Target Name="CopyEQuanticRuntime" AfterTargets="CompileEQuanticUI"
        Condition="'$(EnableEQuanticUICompilation)' == 'true'">
  <PropertyGroup>
    <!-- Resolve from Runtime package via NuGet property -->
    <_RuntimeSourcePath Condition="'$(PkgeQuantic_UI_Runtime)' != ''">
      $(PkgeQuantic_UI_Runtime)/tools/runtime/runtime.js
    </_RuntimeSourcePath>

    <!-- Fallback to source tree (development only) -->
    <_RuntimeSourcePath Condition="'$(_RuntimeSourcePath)' == ''">
      $(MSBuildThisFileDirectory)../../eQuantic.UI.Runtime/dist/index.js
    </_RuntimeSourcePath>

    <_RuntimeDestPath>$(MSBuildProjectDirectory)/$(EQuanticOutputPath)runtime.js</_RuntimeDestPath>
  </PropertyGroup>

  <Error Text="eQuantic.UI: Runtime not found. Ensure eQuantic.UI.Runtime package is installed."
         Condition="'$(_RuntimeSourcePath)' == '' Or !Exists('$(_RuntimeSourcePath)')" />

  <Copy SourceFiles="$(_RuntimeSourcePath)" DestinationFiles="$(_RuntimeDestPath)" />
</Target>
```

### Components Source Deployment

**1. Packaging (Development)**

During `dotnet pack` of **eQuantic.UI.Components**:

```xml
<!-- eQuantic.UI.Components.csproj -->
<ItemGroup>
  <Content Include="**\*.cs" Exclude="obj\**;bin\**" PackagePath="tools\source\" />
</ItemGroup>
```

The Components package embeds its own C# source files for compiler type resolution.

**2. Compilation (Consumer Build)**

During `dotnet build`, the SDK's **CompileEQuanticUI** target executes:

```xml
<!-- Sdk/Sdk.targets -->
<Target Name="CompileEQuanticUI" BeforeTargets="Build">
  <PropertyGroup>
    <!-- Resolve from Components package via NuGet property -->
    <_StandardComponentsDir Condition="'$(PkgeQuantic_UI_Components)' != ''">
      $(PkgeQuantic_UI_Components)/tools/source
    </_StandardComponentsDir>

    <!-- Fallback to source tree (development only) -->
    <_StandardComponentsDir Condition="'$(_StandardComponentsDir)' == ''">
      $(MSBuildThisFileDirectory)../../eQuantic.UI.Components
    </_StandardComponentsDir>
  </PropertyGroup>

  <Error Text="eQuantic.UI: Standard components not found. Ensure eQuantic.UI.Components package is installed."
         Condition="'$(_StandardComponentsDir)' == '' Or !Exists('$(_StandardComponentsDir)')" />

  <Exec Command="dotnet $(EqcCliPath) &quot;$(MSBuildProjectDirectory);$(_StandardComponentsDir)&quot; ..." />
</Target>
```

### Key Architectural Benefits

- **Decoupling**: SDK doesn't embed artifacts from other packages
- **Correct Versioning**: Consumer can use Runtime 0.1.3 + SDK 0.1.2 independently
- **No Duplication**: Each artifact exists only in its source package
- **Flexibility**: Packages evolve independently without tight coupling
- **Clear Interface**: SDK references packages via well-defined NuGet properties (`$(Pkg*)`)
- **Development Fallback**: Source tree paths work for framework development

### Runtime Single Bundle Strategy

The Runtime uses **Vite's `inlineDynamicImports: true`** configuration to create a single bundle:

```typescript
// eQuantic.UI.Runtime/vite.config.ts
export default defineConfig({
  build: {
    rollupOptions: {
      output: {
        inlineDynamicImports: true, // ← Creates single bundle
      },
    },
  },
});
```

**Why Single Bundle?**

- **Simplified Deployment**: Only one file to copy (runtime.js)
- **No Chunk Management**: Avoids issues with separate logger-_.js, error-overlay-_.js chunks
- **Reliable Distribution**: Guaranteed that all runtime features (logger, error overlay) are included
- **Small Size**: ~49KB minified with all features included

Without this, Vite would create separate chunks for dynamic imports, and the SDK would need to copy multiple files with hash-based names.