# AGENTS.md

This file provides guidance to Codex (Codex.ai/code) when working with code in this repository.

## Project Overview

TeamSpeak Android native client with a two-layer architecture:

- **Protocol layer**: Go + [teamspeak-go](https://github.com/honeybbq/teamspeak-go) → compiled to `.aar` via gomobile
- **UI layer**: Kotlin + Jetpack Compose + Material Design 3

## Build Commands

### Full Build (Recommended)
```bash
# Windows
build.bat

# Linux/macOS
./build.sh
```

### Manual Build (Two Steps Required)

**Step 1: Compile Go → AAR**
```bash
cd go
set JAVA_TOOL_OPTIONS=-Dfile.encoding=UTF-8 -Dsun.jnu.encoding=UTF-8  # Windows only
gomobile bind -target=android -androidapi=26 -ldflags="-linkmode=external -extldflags=-Wl,--hash-style=both" -o ../android/app/libs/teamspeak.aar ./teamspeak
```

**Step 2: Build Android APK**
```bash
cd android
gradlew.bat assembleDebug  # Windows
./gradlew assembleDebug     # Linux/macOS
```

### Development Workflow

- **Modified Go code** (`go/`): Re-run Step 1, then run from IDE
- **Modified Kotlin code** (`android/`): Just run from IDE (IntelliJ/Android Studio)

Open the `android/` directory (not root) in IntelliJ IDEA or Android Studio.

## Architecture

### Go ↔ Kotlin Bridge

Communication flows through two bridge layers:

1. **Go side** (`go/teamspeak/bridge.go`): Exports `TSClient` class via gomobile
2. **Kotlin side** (`android/app/src/main/java/com/tsmobile/app/TSBridge.kt`): Wraps gomobile API

**Key constraints** (gomobile limitations):
- Cannot export `[]string`, `[]*T`, or Go `error` types
- Complex data passed as JSON strings (channels, clients)
- Events delivered via callback interfaces
- All JNI callbacks serialized through an event queue to avoid threading issues

**Event flow**: Go library → event queue → single consumer goroutine → JNI callback → Kotlin callback → ViewModel

### Android Layer Structure

```
android/app/src/main/java/com/tsmobile/app/
├── MainActivity.kt              # Entry point
├── TSBridge.kt                  # Go bridge wrapper
├── ui/
│   ├── components/              # Reusable UI components
│   ├── screens/                 # Top-level screens
│   ├── navigation/NavGraph.kt   # App navigation
│   └── theme/                   # Material Design 3 theme
└── viewmodel/                   # State management
    ├── ChannelViewModel.kt      # Channel list & navigation
    ├── ChatViewModel.kt         # Text messaging
    ├── ServerViewModel.kt       # Connection & server info
    └── VoiceViewModel.kt        # Voice communication
```

State flows from ViewModels → Screens via `StateFlow`. User actions flow back via ViewModel methods.

## Critical Build Details

### Required Flags for gomobile

The `-ldflags` are **mandatory** to avoid runtime crashes:

1. **`-linkmode=external`**: Use NDK's external linker instead of Go's built-in linker
   - **Why**: Prevents `SIGSEGV` crashes due to signal handling conflicts between Go runtime and Android
   - Go uses SIGSEGV for GC and goroutine scheduling; Android's memory protection blocks this

2. **`-extldflags=-Wl,--hash-style=both`**: Generate compatible ELF hash tables
   - **Why**: Go 1.24+ uses `DT_SUNW_HASH` by default; Android requires `DT_HASH` or `DT_GNU_HASH`
   - Without this: `dlopen failed: empty/missing DT_HASH/DT_GNU_HASH` error

### Local Patches

The `go/_patches/github.com/honeybbq/teamspeak-go/` directory contains modified upstream code:
- Fixes 32-bit integer overflow issues (`math.MaxUint32` → platform-specific limits)
- Applied via `go.mod` replace directive: `replace github.com/honeybbq/teamspeak-go => ./_patches/github.com/honeybbq/teamspeak-go`

Do not remove this directory or the replace directive.

## Common Issues

### "javac: 非法字符" or "GBK unmappable character"
Set encoding before running gomobile on Windows:
```bash
set JAVA_TOOL_OPTIONS=-Dfile.encoding=UTF-8 -Dsun.jnu.encoding=UTF-8
```

### App crashes with "SIGSEGV" on startup
Missing `-linkmode=external` flag. Rebuild AAR with correct flags.

### App crashes with "empty/missing DT_HASH"
Missing `-Wl,--hash-style=both` flag. Rebuild AAR with correct flags.

### "Unresolved reference: teamspeak"
AAR not compiled or not in `android/app/libs/teamspeak.aar`. Run Step 1 of manual build.

## Testing

Run from IDE with connected device or emulator. Check Logcat in IDE for runtime logs.

No automated test suite currently exists.