# Vendor Library Setup Guide

You have two options to include the Google API Client library:

## Option 1: Manual Download (Recommended for Distribution)

This is the easiest method and doesn't require Composer.

### Step 1: Download Google API PHP Client

1. Go to: https://github.com/googleapis/google-api-php-client/releases
2. Download the latest release (e.g., `google-api-php-client-2.15.0.zip`)
3. Extract the ZIP file

### Step 2: Copy to Vendor Directory

Copy the extracted files into your plugin's `vendor/` directory following this structure:

```
vendor/
├── autoload.php (already exists in plugin)
├── google/
│   ├── apiclient/
│   │   ├── src/
│   │   │   └── Google/
│   │   │       ├── Client.php
│   │   │       ├── Service/
│   │   │       └── ... (all Google API files)
│   │   └── ...
│   └── apiclient-services/
│       ├── autoload.php
│       └── src/
│           └── Google/
│               └── Service/
│                   └── ShoppingContent/
│                       └── ... (Shopping API files)
├── guzzlehttp/
│   ├── guzzle/
│   │   └── src/
│   ├── psr7/
│   │   └── src/
│   └── promises/
│       └── src/
├── psr/
│   ├── http-message/src/
│   ├── http-client/src/
│   ├── cache/src/
│   └── log/Psr/Log/
├── firebase/
│   └── php-jwt/src/
└── monolog/
    └── monolog/src/Monolog/
```

### Step 3: Quick Copy Instructions

If you downloaded the Google API Client via Composer once, you can simply copy the entire vendor directory:

```bash
# Run composer install once (on your development machine)
composer install

# Then copy the entire vendor directory to your plugin
# The plugin's custom autoloader will handle everything
```

The vendor directory will be about 10-15 MB, which is perfectly fine for WordPress plugin distribution.

## Option 2: Use Composer (For Development)

If you're actively developing the plugin:

```bash
cd /path/to/plugin
composer install
```

This will:
- Download all dependencies
- Generate an optimized autoloader
- Create `vendor/autoload_real.php`

The plugin's autoloader (`vendor/autoload.php`) automatically detects and uses Composer's autoloader if available.

## Verifying Installation

After setting up the vendor directory, check that these files exist:

1. `vendor/google/apiclient/src/Google/Client.php`
2. `vendor/google/apiclient-services/src/Google/Service/ShoppingContent.php`
3. `vendor/guzzlehttp/guzzle/src/Client.php`

If these files exist, the plugin will work correctly!

## For Plugin Distribution

When distributing your plugin (e.g., to clients or WordPress.org):

1. **Include the vendor directory** in your plugin ZIP
2. Users simply upload and activate - no Composer needed
3. The custom autoloader handles everything automatically

This is the standard practice for WordPress plugins - most popular plugins include their dependencies rather than requiring Composer.

## Simplified Download Script

Want to automate this? Run this in your plugin directory:

```bash
#!/bin/bash
# Download and setup Google API Client

# Install via Composer (easiest way to get all dependencies)
composer install --no-dev --optimize-autoloader

# Remove Composer development files (optional)
rm -rf vendor/bin
rm -rf vendor/composer/*.json

echo "Google API Client installed successfully!"
echo "You can now distribute the plugin with the vendor directory included."
```

## File Size Note

The complete vendor directory with Google API Client and dependencies is approximately:
- **Uncompressed**: 10-15 MB
- **ZIP compressed**: 2-3 MB

This is acceptable for WordPress plugin distribution and much easier than requiring users to run Composer.

## Troubleshooting

### "Google API Client library is missing" error

If you see this error in WordPress admin:

1. Check that `vendor/google/apiclient/src/Google/Client.php` exists
2. Verify file permissions (should be readable by web server)
3. Check that the autoloader is being loaded (check plugin main file)

### Class not found errors

If you get "Class 'Google_Service_ShoppingContent' not found":

1. Ensure `vendor/google/apiclient-services/` exists
2. Check that Shopping Content service is included in apiclient-services
3. You may need to download the services separately from: https://github.com/googleapis/google-api-php-client-services

## Minimal Installation (Advanced)

If you want to reduce file size, you can include only the required services:

1. Install full Google API Client
2. Keep only these directories:
   - `google/apiclient/`
   - `google/apiclient-services/src/Google/Service/ShoppingContent/`
   - `guzzlehttp/` (all)
   - `psr/` (all)
   - `firebase/php-jwt/`

This reduces the size to ~5 MB while keeping all necessary functionality.