# ✅ Build Configuration Implementation Complete

## Overview

Successfully implemented a build-time configuration system that allows analytics keys to be embedded in official builds via GitHub Actions, while keeping self-hosted deployments completely private.

## What Was Created

### 1. Analytics Defaults Configuration
**File:** `app/config/analytics_defaults.py`

**Features:**
- Placeholder values that get replaced at build time
- Smart detection of official vs self-hosted builds
- Priority system: Env vars > Built-in defaults > Disabled
- Helper functions for configuration retrieval

**Placeholders:**
```python
POSTHOG_API_KEY_DEFAULT = "%%POSTHOG_API_KEY_PLACEHOLDER%%"
SENTRY_DSN_DEFAULT = "%%SENTRY_DSN_PLACEHOLDER%%"
APP_VERSION_DEFAULT = "%%APP_VERSION_PLACEHOLDER%%"
```

### 2. GitHub Actions Workflows

#### Official Release Build
**File:** `.github/workflows/build-and-publish.yml`

**Triggers:**
- Push tags: `v*.*.*` (e.g., `v3.0.0`)
- Manual workflow dispatch

**Process:**
1. Checkout code
2. **Inject analytics keys** from GitHub Secrets
3. Replace placeholders in `analytics_defaults.py`
4. Build Docker image with embedded keys
5. Push to GitHub Container Registry
6. Create GitHub Release with notes

#### Development Build
**File:** `.github/workflows/build-dev.yml`

**Triggers:**
- Push to `main`, `develop`, `feature/**` branches
- Pull requests

**Process:**
1. Checkout code
2. **Keep placeholders intact** (no injection)
3. Build Docker image
4. Push to registry (dev tags)

### 3. Updated Application
**File:** `app/__init__.py`

**Changes:**
- Import analytics configuration
- Detect official vs self-hosted build
- Use config values with fallback to env vars
- Log build type for transparency

### 4. Documentation

#### User Documentation
- **`docs/OFFICIAL_BUILDS.md`** - Explains official vs self-hosted
- **`docs/TELEMETRY_QUICK_START.md`** - User guide
- **`README_BUILD_CONFIGURATION.md`** - Technical overview

#### Setup Documentation
- **`GITHUB_ACTIONS_SETUP.md`** - Step-by-step GitHub Actions setup
- **`BUILD_CONFIGURATION_SUMMARY.md`** - This file

## How It Works

### Configuration Priority

```
┌─────────────────────────────────────────────────────────┐
│ Configuration Loading Order (Highest Priority First)   │
├─────────────────────────────────────────────────────────┤
│                                                         │
│ 1. Environment Variables                                │
│    └─> User can always override                         │
│        export POSTHOG_API_KEY="custom-key"              │
│                                                         │
│ 2. Built-in Defaults (Official Builds Only)            │
│    └─> Injected by GitHub Actions                       │
│        POSTHOG_API_KEY_DEFAULT = "phc_abc123..."        │
│                                                         │
│ 3. Empty/Disabled (Self-Hosted)                        │
│    └─> Placeholders not replaced                        │
│        POSTHOG_API_KEY_DEFAULT = "%%PLACEHOLDER%%"      │
│                                                         │
└─────────────────────────────────────────────────────────┘
```

### Build Process Flow

#### Official Build (GitHub Actions)
```
Tag Push (v3.0.0)
    ↓
Trigger Workflow
    ↓
Checkout Code
    ↓
Load GitHub Secrets
    ↓
Replace Placeholders
    sed -i "s|%%POSTHOG_API_KEY_PLACEHOLDER%%|$POSTHOG_API_KEY|g"
    ↓
Verify Replacement
    (fail if placeholders still present)
    ↓
Build Docker Image
    (keys are now embedded)
    ↓
Push to Registry
    ghcr.io/username/timetracker:v3.0.0
    ↓
Create Release
```

#### Self-Hosted Build (Local)
```
Clone Repository
    ↓
Docker Build
    ↓
Placeholders Remain
    %%POSTHOG_API_KEY_PLACEHOLDER%%
    ↓
Application Detects Empty
    is_placeholder() returns True
    ↓
Analytics Disabled
    (unless user provides own keys)
```

## Setup Instructions

### For Repository Owners (Official Builds)

#### Step 1: Get Analytics Keys

**PostHog:**
1. Sign up at https://posthog.com
2. Create project
3. Copy API key (starts with `phc_`)

**Sentry:**
1. Sign up at https://sentry.io
2. Create project
3. Copy DSN (starts with `https://`)

#### Step 2: Add GitHub Secrets

```
Repository → Settings → Secrets and variables → Actions

Add secrets:
  - POSTHOG_API_KEY: phc_xxxxxxxxxxxxx
  - SENTRY_DSN: https://xxx@xxx.ingest.sentry.io/xxx
```

#### Step 3: Trigger Build

```bash
# Create a version tag
git tag v3.0.0
git push origin v3.0.0

# GitHub Actions runs automatically
# Monitor at: Actions tab → Build and Publish Official Release
```

#### Step 4: Verify

```bash
# Pull the image
docker pull ghcr.io/YOUR_USERNAME/timetracker:v3.0.0

# Check if official build
docker run --rm ghcr.io/YOUR_USERNAME/timetracker:v3.0.0 \
  python3 -c "from app.config.analytics_defaults import is_official_build; \
  print('Official build' if is_official_build() else 'Self-hosted')"

# Should output: "Official build"
```

### For End Users

#### Official Build (Recommended)
```bash
# Pull and run
docker pull ghcr.io/YOUR_USERNAME/timetracker:latest
docker-compose up -d

# On first access:
# - See setup page
# - Choose to enable/disable telemetry
# - Analytics keys are already configured (if opted in)
```

#### Self-Hosted Build
```bash
# Clone and build
git clone https://github.com/YOUR_USERNAME/timetracker.git
cd timetracker
docker build -t timetracker:self-hosted .

# Run without analytics (default)
docker-compose up -d

# Or provide your own keys
export POSTHOG_API_KEY="your-key"
docker-compose up -d
```

## Key Features

### ✅ Privacy-First
- Telemetry still opt-in (disabled by default)
- Users can override or disable keys
- Self-hosted builds have no embedded keys
- No PII ever collected

### ✅ Transparent
- Open source build process
- Placeholders visible in source code
- Build logs show injection process
- Can verify official builds

### ✅ Flexible
- Users can use official keys
- Users can use their own keys
- Users can disable analytics
- All via environment variables

### ✅ Secure
- Keys stored as GitHub Secrets (encrypted)
- Never in source code
- Only injected at build time
- Secrets not logged

## File Structure

```
timetracker/
├── app/
│   └── config/
│       ├── __init__.py                     # Config module init
│       └── analytics_defaults.py           # Analytics config with placeholders
│
├── .github/
│   └── workflows/
│       ├── build-and-publish.yml           # Official release builds
│       └── build-dev.yml                   # Development builds
│
├── docs/
│   ├── OFFICIAL_BUILDS.md                  # User guide
│   └── TELEMETRY_QUICK_START.md            # Telemetry guide
│
├── GITHUB_ACTIONS_SETUP.md                 # GitHub setup guide
├── README_BUILD_CONFIGURATION.md           # Technical docs
└── BUILD_CONFIGURATION_SUMMARY.md          # This file
```

## Verification

### Check Official Build
```bash
docker run --rm IMAGE_NAME \
  python3 -c "from app.config.analytics_defaults import is_official_build; \
  print('Official' if is_official_build() else 'Self-hosted')"
```

### Check Configuration
```bash
docker run --rm IMAGE_NAME \
  python3 -c "from app.config.analytics_defaults import get_analytics_config; \
  import json; print(json.dumps(get_analytics_config(), indent=2))"
```

### View Logs
```bash
docker-compose logs app | grep -E "(Official|Self-hosted|PostHog|Sentry)"
```

## Testing

### Test Official Build Process
```bash
# Create test tag
git tag v3.0.0-test
git push origin v3.0.0-test

# Monitor Actions tab
# Verify:
# - ✅ Analytics configuration injected
# - ✅ All placeholders replaced
# - ✅ Image built and pushed
```

### Test Self-Hosted Build
```bash
# Build locally
docker build -t test .

# Verify placeholders remain
docker run --rm test cat app/config/analytics_defaults.py | \
  grep "%%POSTHOG_API_KEY_PLACEHOLDER%%"

# Should show the placeholder (not replaced)
```

### Test Override
```bash
# Official build with custom key
docker run -e POSTHOG_API_KEY="my-key" IMAGE_NAME

# Check logs - should use custom key
docker logs CONTAINER_ID | grep PostHog
```

## Troubleshooting

### Placeholders Not Replaced

**Symptom:** Official build still shows `%%PLACEHOLDER%%`

**Solutions:**
1. Check GitHub Secrets are set correctly
2. Verify secret names match exactly (case-sensitive)
3. Check workflow logs for sed command output
4. Re-run the workflow

### Analytics Not Working

**Symptom:** No events in PostHog/Sentry

**Solutions:**
1. Check telemetry is enabled in admin dashboard
2. Verify API key is valid (test in PostHog UI)
3. Check logs: `docker logs CONTAINER | grep PostHog`
4. Verify network connectivity to analytics services

### Build Fails

**Symptom:** GitHub Actions workflow fails

**Solutions:**
1. Check workflow permissions (read+write)
2. Verify GITHUB_TOKEN has package access
3. Review error logs in Actions tab
4. Check Dockerfile builds locally

## Security Considerations

### ✅ Best Practices Implemented

- Secrets stored in GitHub Secrets (encrypted at rest)
- Keys never in source code or commits
- Placeholders clearly marked
- Self-hosted users can opt-out entirely
- Environment variables can override everything

### ⚠️ Important Notes

- Official build users can extract embedded keys (by design)
- Keys only work with your PostHog/Sentry projects
- Rotate keys if compromised
- Self-hosted users should use their own keys

## Summary

This implementation provides:

1. **Official Builds:** Analytics keys embedded for easy community support
2. **Self-Hosted Builds:** Complete privacy and control
3. **User Choice:** Can override or disable at any time
4. **Transparency:** Open source process, no hidden tracking
5. **Security:** Keys never in source code, stored securely

All while maintaining the core privacy principles:
- ✅ Opt-in telemetry (disabled by default)
- ✅ No PII ever collected
- ✅ User control at all times
- ✅ Complete transparency

---

## Next Steps

### For Repository Owners
1. Follow `GITHUB_ACTIONS_SETUP.md` to configure secrets
2. Push a test tag to verify the workflow
3. Review the official build in GHCR
4. Update main README with official build instructions

### For Users
1. Decide: Official build or self-hosted?
2. Pull/build the image
3. Run and complete first-time setup
4. Choose telemetry preference

**Ready to deploy!** 🚀

