# Environment Variables Configuration

## Search Configuration

### MATCH_COUNT
- **Description**: Số lượng documents tối đa được trả về từ vector search
- **Default**: `15`
- **Usage**: `MATCH_COUNT=20`
- **Impact**: Ảnh hưởng đến số lượng docs được query từ database

### MAX_DOCS_TO_RERANK
- **Description**: Số lượng documents tối đa được rerank
- **Default**: `15`
- **Usage**: `MAX_DOCS_TO_RERANK=20`
- **Impact**: Ảnh hưởng đến số lượng docs được xử lý trong reranking

## Logging Configuration

### LOG_LEVEL
- **Description**: Mức độ logging (DEBUG, INFO, WARNING, ERROR, CRITICAL)
- **Default**: `DEBUG`
- **Usage**: `LOG_LEVEL=INFO`
- **Impact**: Ảnh hưởng đến số lượng logs được hiển thị

## Facebook Configuration

### FACEBOOK_APP_SECRET
- **Description**: Facebook App Secret
- **Required**: Yes
- **Usage**: `FACEBOOK_APP_SECRET=your_app_secret`

### FACEBOOK_VERIFY_TOKEN
- **Description**: Facebook Webhook Verify Token
- **Required**: Yes
- **Usage**: `FACEBOOK_VERIFY_TOKEN=your_verify_token`

## Supabase Configuration

### SUPABASE_URL
- **Description**: Supabase project URL
- **Required**: Yes
- **Usage**: `SUPABASE_URL=https://your-project.supabase.co`

### SUPABASE_KEY
- **Description**: Supabase service role key
- **Required**: Yes
- **Usage**: `SUPABASE_KEY=your_service_role_key`

## Google Sheets Configuration

### GOOGLE_SHEETS_CREDENTIALS_FILE
- **Description**: Path to Google Sheets credentials file
- **Required**: Yes (if not using GOOGLE_SHEETS_CREDENTIALS_JSON)
- **Usage**: `GOOGLE_SHEETS_CREDENTIALS_FILE=./credentials.json`

### GOOGLE_SHEETS_CREDENTIALS_JSON
- **Description**: Google Sheets credentials as JSON string (alternative to credentials file)
- **Required**: Yes (if not using GOOGLE_SHEETS_CREDENTIALS_FILE)
- **Usage**: `GOOGLE_SHEETS_CREDENTIALS_JSON={"type":"service_account","project_id":"..."}`

### GOOGLE_SHEETS_TOKEN_FILE
- **Description**: Path to Google Sheets token file
- **Required**: Yes
- **Usage**: `GOOGLE_SHEETS_TOKEN_FILE=./token.json`

### CONVERSATION_SHEET_ID
- **Description**: Google Sheets ID for conversation logging
- **Required**: Yes
- **Usage**: `CONVERSATION_SHEET_ID=your_sheet_id`

## Server Configuration

### HOST
- **Description**: Server host address
- **Default**: `0.0.0.0`
- **Usage**: `HOST=127.0.0.1`

### PORT
- **Description**: Server port
- **Default**: `8000`
- **Usage**: `PORT=7860`

## LLM Configuration

### LLM_PROVIDER
- **Description**: LLM provider (gemini, openai, etc.)
- **Default**: `gemini`
- **Usage**: `LLM_PROVIDER=gemini`

### LLM_MODEL
- **Description**: LLM model name
- **Default**: `gemini-2.5-flash`
- **Usage**: `LLM_MODEL=gemini-2.0-flash-exp`

### RERANK_PROVIDER
- **Description**: Rerank provider (defaults to LLM_PROVIDER if not set)
- **Default**: Uses LLM_PROVIDER value
- **Usage**: `RERANK_PROVIDER=gemini`

### RERANK_MODEL
- **Description**: Rerank model name (defaults to LLM_MODEL if not set)
- **Default**: Uses LLM_MODEL value
- **Usage**: `RERANK_MODEL=gemini-2.0-flash-exp`

## Embedding Configuration

### EMBEDDING_PROVIDER
- **Description**: Embedding provider (gemini, openai, etc.)
- **Default**: `gemini`
- **Usage**: `EMBEDDING_PROVIDER=gemini`

### EMBEDDING_MODEL
- **Description**: Embedding model name
- **Default**: `models/embedding-001`
- **Usage**: `EMBEDDING_MODEL=models/embedding-001`

## Gemini Configuration

### GEMINI_API_KEYS
- **Description**: Comma-separated list of Gemini API keys
- **Required**: Yes
- **Usage**: `GEMINI_API_KEYS=key1,key2,key3`

### GEMINI_MODELS
- **Description**: Comma-separated list of Gemini models
- **Required**: Yes
- **Usage**: `GEMINI_MODELS=gemini-2.0-flash-exp,gemini-1.5-flash`

### GEMINI_BASE_URL
- **Description**: Gemini API base URL
- **Default**: `https://generativelanguage.googleapis.com/v1`
- **Usage**: `GEMINI_BASE_URL=https://generativelanguage.googleapis.com/v1`

## Example .env file

```env
# Search Configuration
MATCH_COUNT=15
MAX_DOCS_TO_RERANK=15

# Logging Configuration
LOG_LEVEL=DEBUG

# Facebook Configuration
FACEBOOK_APP_SECRET=your_app_secret
FACEBOOK_VERIFY_TOKEN=your_verify_token

# Supabase Configuration
SUPABASE_URL=https://your-project.supabase.co
SUPABASE_KEY=your_service_role_key

# Google Sheets Configuration
GOOGLE_SHEETS_CREDENTIALS_FILE=./credentials.json
# GOOGLE_SHEETS_CREDENTIALS_JSON={"type":"service_account","project_id":"..."}
GOOGLE_SHEETS_TOKEN_FILE=./token.json
CONVERSATION_SHEET_ID=your_sheet_id

# Server Configuration
HOST=0.0.0.0
PORT=8000

# LLM Configuration
LLM_PROVIDER=gemini
LLM_MODEL=gemini-2.5-flash
RERANK_PROVIDER=gemini
RERANK_MODEL=gemini-2.5-flash

# Embedding Configuration
EMBEDDING_PROVIDER=gemini
EMBEDDING_MODEL=models/embedding-001

# Gemini Configuration
GEMINI_API_KEYS=key1,key2,key3
GEMINI_MODELS=gemini-2.0-flash-exp,gemini-1.5-flash
GEMINI_BASE_URL=https://generativelanguage.googleapis.com/v1
```

## Performance Tuning

### Để tăng performance:
- Giảm `MATCH_COUNT` và `MAX_DOCS_TO_RERANK` xuống 10-12
- Set `LOG_LEVEL=INFO` để giảm log noise
- Sử dụng model nhẹ hơn: `LLM_MODEL=gemini-1.5-flash`

### Để tăng accuracy:
- Tăng `MATCH_COUNT` và `MAX_DOCS_TO_RERANK` lên 20-25
- Set `LOG_LEVEL=DEBUG` để debug chi tiết hơn
- Sử dụng model mạnh hơn: `LLM_MODEL=gemini-2.0-flash-exp`

## Provider Switching

### Chuyển sang OpenAI:
```env
LLM_PROVIDER=openai
LLM_MODEL=gpt-4
EMBEDDING_PROVIDER=openai
EMBEDDING_MODEL=text-embedding-ada-002
```

### Chuyển sang Cohere:
```env
LLM_PROVIDER=cohere
LLM_MODEL=command
EMBEDDING_PROVIDER=cohere
EMBEDDING_MODEL=embed-english-v3.0
```

## Troubleshooting

### Common Issues:
1. **Missing API Keys**: Đảm bảo `GEMINI_API_KEYS` được set
2. **Invalid Models**: Kiểm tra `GEMINI_MODELS` có đúng format không
3. **Database Connection**: Verify `SUPABASE_URL` và `SUPABASE_KEY`
4. **Facebook Webhook**: Check `FACEBOOK_APP_SECRET` và `FACEBOOK_VERIFY_TOKEN`