#!/usr/bin/env python3
"""
Interactive Setup Wizard for ATOM Application
Guides users through environment configuration step-by-step.
"""

import base64
import os
from pathlib import Path
import secrets


def generate_secret_key() -> str:
    """Generate a secure random key for encryption."""
    return base64.b64encode(secrets.token_bytes(32)).decode('utf-8')


def get_input(prompt: str, default: str = "", required: bool = False) -> str:
    """Get user input with optional default value."""
    if default:
        full_prompt = f"{prompt} [{default}]: "
    else:
        full_prompt = f"{prompt}: "
    
    while True:
        value = input(full_prompt).strip()
        if not value and default:
            return default
        if not value and required:
            print("❌ This field is required. Please provide a value.")
            continue
        return value


def main():
    """Main setup wizard."""
    print("=" * 80)
    print("🚀 ATOM APPLICATION - INTERACTIVE SETUP WIZARD")
    print("=" * 80)
    print()
    print("This wizard will help you create a .env file with your credentials.")
    print("Press Enter to skip optional fields.")
    print()
    
    # Check if .env already exists
    env_path = Path(__file__).parent.parent.parent / ".env"
    if env_path.exists():
        response = input("⚠️  .env file already exists. Overwrite? (y/N): ").strip().lower()
        if response != 'y':
            print("Setup cancelled.")
            return
    
    config = {}
    
    # Required: Security keys
    print("\n🔒 SECURITY CONFIGURATION (Required)")
    print("-" * 80)
    print("Generating secure encryption keys...")
    config["NEXTAUTH_SECRET"] = generate_secret_key()
    config["ATOM_ENCRYPTION_KEY"] = generate_secret_key()
    config["BYOK_ENCRYPTION_KEY"] = generate_secret_key()
    print("✅ Generated NEXTAUTH_SECRET")
    print("✅ Generated ATOM_ENCRYPTION_KEY")
    print("✅ Generated BYOK_ENCRYPTION_KEY")
    
    config["NEXTAUTH_URL"] = get_input(
        "NextAuth URL", 
        default="http://localhost:3000",
        required=True
    )
    
    # Core configuration
    print("\n⚙️  CORE CONFIGURATION")
    print("-" * 80)
    config["NODE_ENV"] = get_input("Environment", default="development")
    config["NEXT_PUBLIC_API_BASE_URL"] = get_input(
        "Backend API URL",
        default="http://localhost:8000"
    )
    config["LOG_LEVEL"] = get_input("Log Level", default="info")
    
    # Database
    print("\n💾 DATABASE CONFIGURATION")
    print("-" * 80)
    config["LANCEDB_PATH"] = get_input("LanceDB Path", default="./data/lancedb")
    config["SQLITE_PATH"] = get_input("SQLite Path", default="./data/atom.db")
    
    use_postgres = input("Use PostgreSQL? (y/N): ").strip().lower() == 'y'
    if use_postgres:
        config["DATABASE_URL"] = get_input("PostgreSQL URL", required=True)
    
    # AI Services
    print("\n🤖 AI SERVICES (Optional - Add as needed)")
    print("-" * 80)
    print("Tip: You can skip these and add them later in .env")
    
    if input("Configure OpenAI? (y/N): ").strip().lower() == 'y':
        config["OPENAI_API_KEY"] = get_input("OpenAI API Key", required=True)
    
    if input("Configure Anthropic (Claude)? (y/N): ").strip().lower() == 'y':
        config["ANTHROPIC_API_KEY"] = get_input("Anthropic API Key", required=True)
    
    # Integrations (optional)
    print("\n🔌 INTEGRATIONS (Optional)")
    print("-" * 80)
    print("You can configure integrations now or add them later.")
    print("See docs/missing_credentials_guide.md for full list.")
    
    if input("Configure Slack? (y/N): ").strip().lower() == 'y':
        config["SLACK_CLIENT_ID"] = get_input("Slack Client ID", required=True)
        config["SLACK_CLIENT_SECRET"] = get_input("Slack Client Secret", required=True)
    
    if input("Configure Google Services? (y/N): ").strip(). lower() == 'y':
        config["GOOGLE_CLIENT_ID"] = get_input("Google Client ID", required=True)
        config["GOOGLE_CLIENT_SECRET"] = get_input("Google Client Secret", required=True)
    
    # Write .env file
    print("\n📝 Writing .env file...")
    with open(env_path, 'w') as f:
        f.write("# ATOM Application Environment Variables\n")
        f.write(f"# Generated by setup wizard\n\n")
        
        for key, value in config.items():
            f.write(f"{key}={value}\n")
        
        f.write("\n# Add more credentials as needed")
        f.write("\n# See .env.example for full template\n")
    
    print("✅ .env file created successfully!")
    print()
    print("=" * 80)
    print("NEXT STEPS")
    print("=" * 80)
    print("1. Review and edit .env to add more integrations")
    print("2. Run: python backend/scripts/validate_credentials.py")
    print("3. Start backend: cd backend && python main_api_app.py")
    print("4. Start frontend: cd frontend-nextjs && npm run dev")
    print()
    print("📖 For more integrations: See .env.example and docs/missing_credentials_guide.md")
    print("=" * 80)


if __name__ == "__main__":
    try:
        main()
    except KeyboardInterrupt:
        print("\n\nSetup cancelled by user.")
    except Exception as e:
        print(f"\n❌ Error: {e}")
        print("Please check your inputs and try again.")