"""
Main entry point for the Sales Assistant application.

This file serves as the primary interface to run the sales assistant agent.
It uses the agent runner from agent_main/agent_runner.py to create and manage
the conversational agent with database exploration capabilities.
"""
import os
import sys
from typing import Optional
from dotenv import load_dotenv

# Add the src directory to the path so we can import from sales_assistant
sys.path.insert(0, os.path.join(os.path.dirname(__file__), '..'))

from sales_assistant.agent_main.agent_runner import (
    ConversationConfig, 
    run_interactive_loop, 
    create_agent_runner,
    run_conversation_turn
)
from sales_assistant.agent_main.tools_node import get_all_tools

# Load environment variables
load_dotenv()


def check_environment_setup() -> bool:
    """
    Check if the environment is properly set up for the agent.
    
    Returns:
        True if environment is properly configured, False otherwise
    """
    required_vars = [
        "OPENAI_API_KEY",
        "MODEL_PROVIDER", 
        "MODEL_NAME",
        "MYSQL_HOST",
        "MYSQL_USER",
        "MYSQL_PASSWORD", 
        "MYSQL_DB"
    ]
    
    missing_vars = [var for var in required_vars if not os.getenv(var)]
    
    if missing_vars:
        print("❌ Missing required environment variables:")
        for var in missing_vars:
            print(f"   - {var}")
        print("\n💡 Please set these variables in your .env file")
        return False
    
    print("✅ Environment configuration looks good!")
    return True


def display_available_tools() -> None:
    """Display available tools information."""
    try:
        tools = get_all_tools()
        print("\n🛠️  Available Tools:")
        print("-" * 30)
        
        for i, tool in enumerate(tools, 1):
            tool_name = getattr(tool, 'name', 'Unknown Tool')
            tool_description = getattr(tool, 'description', 'No description available')
            print(f"{i}. {tool_name}")
            print(f"   📝 {tool_description}")
            
        print(f"\n📊 Total tools available: {len(tools)}")
        print("-" * 30)
        
    except Exception as e:
        print(f"⚠️  Could not load tools information: {e}")


def create_custom_config(
    session_id: Optional[str] = None,
    user_id: Optional[str] = None,
    enable_langsmith: bool = True,
    recursion_limit: int = int(os.getenv("LANGRAPH_RECURSION_LIMIT", "100"))
) -> ConversationConfig:
    """
    Create a custom configuration for the agent.
    
    Args:
        session_id: Optional custom session ID
        user_id: Optional user identifier
        enable_langsmith: Whether to enable LangSmith tracing
        recursion_limit: Maximum recursion limit for LangGraph
        
    Returns:
        ConversationConfig object
    """
    config = ConversationConfig(
        enable_langsmith=enable_langsmith,
        langsmith_project=os.getenv("LANGSMITH_PROJECT", "sales-assistant-prod"),
        recursion_limit=recursion_limit
    )
    
    if session_id:
        config.session_id = session_id
    if user_id:
        config.user_id = user_id
    
    return config


def run_sales_assistant(
    interactive: bool = True,
    custom_config: Optional[ConversationConfig] = None
) -> None:
    """
    Main function to run the sales assistant.
    
    Args:
        interactive: Whether to run in interactive mode
        custom_config: Optional custom configuration
    """
    print("🚀 Starting Sales Assistant...")
    
    # Check environment setup
    if not check_environment_setup():
        return
    
    # Display available tools
    display_available_tools()
    
    try:
        if interactive:
            print("\n💬 Starting interactive mode...")
            config = custom_config or ConversationConfig()
            run_interactive_loop(config)
        else:
            print("\n⚙️ Agent initialized and ready for programmatic use")
            config = custom_config or ConversationConfig()
            compiled_graph, checkpointer, callback_manager, thread_id = create_agent_runner(config)
            print(f"📊 Session ID: {config.session_id}")
            print(f"🧵 Thread ID: {thread_id}")
            print("💡 Use the returned objects to run conversations programmatically")
            return compiled_graph, checkpointer, callback_manager, thread_id
            
    except KeyboardInterrupt:
        print("\n👋 Sales Assistant stopped by user")
    except Exception as e:
        print(f"❌ Error running Sales Assistant: {str(e)}")
        sys.exit(1)


def single_query(query: str, config: Optional[ConversationConfig] = None) -> str:
    """
    Run a single query against the agent without interactive mode.
    
    Args:
        query: The question to ask the agent
        config: Optional configuration
        
    Returns:
        Agent's response
    """
    if not check_environment_setup():
        return "Environment not properly configured"
    
    try:
        config = config or ConversationConfig()
        compiled_graph, checkpointer, callback_manager, thread_id = create_agent_runner(config)
        
        response = run_conversation_turn(
            compiled_graph, 
            thread_id, 
            query, 
            callback_manager
        )
        
        return response
        
    except Exception as e:
        return f"Error processing query: {str(e)}"


def main():
    """
    Main entry point when running the script directly.
    """
    import argparse
    
    parser = argparse.ArgumentParser(
        description="Sales Assistant - Database-powered product inquiry agent"
    )
    parser.add_argument(
        "--mode", 
        choices=["interactive", "single"],
        default="interactive",
        help="Mode to run the assistant in"
    )
    parser.add_argument(
        "--query",
        type=str,
        help="Single query to run (only for single mode)"
    )
    parser.add_argument(
        "--no-langsmith",
        action="store_true",
        help="Disable LangSmith tracing"
    )
    parser.add_argument(
        "--session-id",
        type=str,
        help="Custom session ID"
    )
    parser.add_argument(
        "--user-id", 
        type=str,
        help="User identifier"
    )
    
    args = parser.parse_args()
    
    # Create configuration
    config = create_custom_config(
        session_id=args.session_id,
        user_id=args.user_id,
        enable_langsmith=not args.no_langsmith
    )
    
    if args.mode == "single":
        if not args.query:
            print("❌ --query is required for single mode")
            sys.exit(1)
        
        print(f"🔍 Processing query: {args.query}")
        response = single_query(args.query, config)
        print(f"🤖 Response: {response}")
        
    else:  # interactive mode
        run_sales_assistant(interactive=True, custom_config=config)


if __name__ == "__main__":
    main()