#!/bin/bash

# Hugging Face Hub Setup Script for DTO Framework
# Uses HF Hub with Xet backend transparently
# Prometheus - Head of Data Migration & Transfer Operations

set -euo pipefail

# Configuration
HF_HOME="${HF_HOME:-/workspace/.hf_home}"
CONFIG_DIR="/etc/dto/huggingface"
LOG_DIR="/var/log/dto"

# Colors for output
RED='\033[0;31m'
GREEN='\033[0;32m'
YELLOW='\033[1;33m'
NC='\033[0m' # No Color

# Logging function
log() {
    echo -e "${GREEN}[$(date '+%Y-%m-%d %H:%M:%S')]${NC} $1"
}

error() {
    echo -e "${RED}[ERROR]${NC} $1" >&2
}

warning() {
    echo -e "${YELLOW}[WARNING]${NC} $1"
}

# Install Hugging Face Hub
install_huggingface_hub() {
    log "Installing Hugging Face Hub"
    
    pip install huggingface_hub --upgrade
    
    # Verify installation
    if python -c "import huggingface_hub; print('huggingface_hub available')" 2>/dev/null; then
        log "Hugging Face Hub installed successfully"
    else
        error "Hugging Face Hub installation failed"
        exit 1
    fi
}

# Configure Hugging Face environment
configure_huggingface() {
    log "Configuring Hugging Face environment"
    
    # Create directories
    mkdir -p "$CONFIG_DIR" "$LOG_DIR" "$HF_HOME"
    
    # Set HF_HOME environment variable
    echo "export HF_HOME=$HF_HOME" > "$CONFIG_DIR/environment"
    echo "export HF_TOKEN=\"\"" >> "$CONFIG_DIR/environment"
    
    # Set permissions
    chmod 755 "$HF_HOME"
    chmod 644 "$CONFIG_DIR/environment"
    
    log "Hugging Face environment configured"
}

# Setup authentication
setup_authentication() {
    log "Setting up Hugging Face authentication"
    
    if [ -n "$HF_TOKEN" ]; then
        log "HF_TOKEN environment variable found"
        # Test authentication
        if python -c "
from huggingface_hub import HfApi
try:
    api = HfApi(token='$HF_TOKEN')
    user = api.whoami()
    print(f'Authenticated as: {user[\"name\"]}')
except Exception as e:
    print(f'Authentication failed: {e}')
    exit(1)
" 2>/dev/null; then
            log "Hugging Face authentication successful"
        else
            warning "Hugging Face authentication test failed"
        fi
    else
        warning "HF_TOKEN not set. Please set HF_TOKEN environment variable for full access"
        echo "# To authenticate with Hugging Face Hub:" >> "$CONFIG_DIR/README"
        echo "# 1. Get your token from https://huggingface.co/settings/tokens" >> "$CONFIG_DIR/README"
        echo "# 2. Export it: export HF_TOKEN=your_token_here" >> "$CONFIG_DIR/README"
        echo "# 3. Or add to environment file" >> "$CONFIG_DIR/README"
    fi
}

# Install dependencies
install_dependencies() {
    log "Installing dependencies"
    
    # Update package list
    apt-get update || yum update || {
        warning "Package manager update failed - continuing anyway"
    }
    
    # Install required packages
    if command -v apt-get >/dev/null 2>&1; then
        apt-get install -y curl python3-pip
    elif command -v yum >/dev/null 2>&1; then
        yum install -y curl python3-pip
    elif command -v dnf >/dev/null 2>&1; then
        dnf install -y curl python3-pip
    else
        warning "Unknown package manager - please install curl and python3-pip manually"
    fi
}

# Test Hugging Face functionality
test_integration() {
    log "Testing Hugging Face integration"
    
    # Basic functionality test
    if python -c "
from huggingface_hub import HfApi, HfFolder
print('Hugging Face Hub available')
print('HF_HOME:', HfFolder.path)
" 2>/dev/null; then
        log "Hugging Face integration test passed"
    else
        error "Hugging Face integration test failed"
        exit 1
    fi
}

# Main installation function
main() {
    log "Starting Hugging Face Hub installation for DTO Framework"
    
    install_dependencies
    install_huggingface_hub
    configure_huggingface
    setup_authentication
    test_integration
    
    log "Hugging Face Hub installation completed successfully!"
    log "Next steps:"
    log "  1. Set HF_TOKEN environment variable for authentication"
    log "  2. Configure repositories in integrations/huggingface_config.yaml"
    log "  3. Use integrations/huggingface_client.py for operations"
    log "  4. Xet backend is automatically handled by Hugging Face"
}

# Run main function
main "$@"