import os
import re
from typing import Optional, Dict, List, Any

from dotenv import load_dotenv
from arangoasync import ArangoClient
from arangoasync.auth import Auth

load_dotenv()
if "ARANGO_HOSTS" not in os.environ:
    import env_manager
    env_manager.set_env()


class Arango:
    """
    Async wrapper for python-arango-async.

    Usage (preferred, ensures cleanup):
        async with Arango() as ar:
            await ar.create_collection("my_col")
            docs = await ar.execute_aql("FOR d IN my_col RETURN d")

    Or manual:
        ar = Arango()
        await ar.connect()
        ...
        await ar.close()
    """

    def __init__(
        self,
        db_name: Optional[str] = None,
        username: Optional[str] = None,
        password: Optional[str] = None,
        hosts: Optional[str] = None,
    ):
        self.hosts = hosts or os.environ.get("ARANGO_HOSTS")
        self.db_name = db_name or os.environ.get("ARANGO_DB")
        self.username = username or os.environ.get("ARANGO_USERNAME")
        self.password = password or os.environ.get("ARANGO_PWD")

        self._client: Optional[ArangoClient] = None
        self._db = None
        self._auth = Auth(username=self.username, password=self.password)

    # context manager support
    async def __aenter__(self):
        await self.connect()
        return self

    async def __aexit__(self, exc_type, exc, tb):
        await self.close()

    async def connect(self):
        """
        Create the ArangoClient and connect to the configured database.
        Must be called before doing DB operations if not using `async with`.
        """
        # create client (no network call yet)
        self._client = ArangoClient(hosts=self.hosts)

        # IMPORTANT: client.db(...) is an async call and must be awaited,
        # and you should pass auth if your server requires authentication.
        self._db = await self._client.db(self.db_name, auth=self._auth)
        return self

    async def close(self):
        """Close the underlying client (releases connections)."""
        if self._client:
            await self._client.close()
            self._client = None
            self._db = None

    def fix_key(self, _key: str) -> str:
        return re.sub(r"[^A-Za-z0-9_\-\.@()+=;\$!*\'%:]", "_", _key)

    async def execute_aql(
        self,
        query: str,
        bind_vars: Optional[Dict[str, Any]] = None,
        batch_size: Optional[int] = None,
    ) -> List[Dict[str, Any]]:
        """
        Execute AQL and return a list of documents.
        Uses async cursor pattern from the docs.
        """
        await self.connect()
        assert self._db is not None, "call connect() or use `async with` first"

        # You may choose to use `async with await self._db.aql.execute(query) as cursor:`
        # or just `cursor = await self._db.aql.execute(...)` and then 'async for' over it.
        print(query)
        cursor = await self._db.aql.execute(query, bind_vars=bind_vars or {}, batch_size=batch_size)
        results: List[Dict[str, Any]] = []

        # Using `async with` ensures the cursor is cleaned up server-side when done.
        async with cursor:
            async for doc in cursor:
                results.appe


# Example usage
async def main():
    arango = Arango()
    results = await arango.execute_aql("FOR doc IN talks LIMIT 2 RETURN doc")
    print(results)


if __name__ == "__main__":
    import asyncio
    asyncio.run(main())