"""Interactive CLI for the RAG agent.

The CLI supports the following commands:

* ``/add <dir>`` – Load all .txt/.md files from *dir* into Qdrant.
* ``/search <query>`` – Run the agent on *query* and print the answer.
* ``/quit`` – Exit the program.

The vector store is created on first use and persisted in
``./qdrant_db``.
"""

import os
from pathlib import Path

# Load environment variables (e.g., TAVILY_API_KEY)
from dotenv import load_dotenv
load_dotenv()

# Local modules
from .vector_store import create_vectorstore, load_documents
from .agent import create_agent
from . import tools

# ---------------------------------------------------------------------------
# Global state
# ---------------------------------------------------------------------------
VECTORSTORE = None
AGENT = None

# ---------------------------------------------------------------------------
# Helper functions
# ---------------------------------------------------------------------------

def init_vectorstore() -> None:
    global VECTORSTORE
    if VECTORSTORE is None:
        VECTORSTORE = create_vectorstore()
        # Expose the store to the tools module so that the decorated
        # functions can access it via the global name ``vectorstore``.
        tools.vectorstore = VECTORSTORE

def init_agent() -> None:
    global AGENT
    if AGENT is None:
        AGENT = create_agent()

def add_documents(directory: str) -> None:
    init_vectorstore()
    load_documents(directory, VECTORSTORE)

def run_query(query: str) -> None:
    init_agent()
    # The agent expects a dictionary with the key ``input``.
    result = AGENT.invoke({"input": query})
    print("\nAnswer:\n", result)

# ---------------------------------------------------------------------------
# CLI loop
# ---------------------------------------------------------------------------

def main() -> None:
    print("RAG Agent CLI.  Type '/quit' to exit.")
    while True:
        try:
            line = input("> ")
        except (EOFError, KeyboardInterrupt):
            print("\nBye!")
            break
        if not line:
            continue
        if line.strip() == "/quit":
            print("Bye!")
            break
        if line.startswith("/add "):
            _, dir_path = line.split(" ", 1)
            dir_path = dir_path.strip()
            if not os.path.isdir(dir_path):
                print(f"{dir_path} is not a directory.")
                continue
            add_documents(dir_path)
            print("Documents added.")
        elif line.startswith("/search "):
            _, query = line.split(" ", 1)
            run_query(query.strip())
        else:
            print("Unknown command. Use /add, /search, or /quit.")

if __name__ == "__main__":
    main()