import os
import asyncio
import inspect
import logging
import logging.config
from lightrag import LightRAG, QueryParam
from lightrag.llm.openai import openai_complete_if_cache
from lightrag.llm.ollama import ollama_embed
from lightrag.utils import EmbeddingFunc, logger, set_verbose_debug
import numpy as np
from lightrag.kg.shared_storage import initialize_pipeline_status

WORKING_DIR = "./dickens"


def configure_logging():
    """Configure logging for the application"""

    # Reset any existing handlers to ensure clean configuration
    for logger_name in ["uvicorn", "uvicorn.access", "uvicorn.error", "lightrag"]:
        logger_instance = logging.getLogger(logger_name)
        logger_instance.handlers = []
        logger_instance.filters = []

    # Get log directory path from environment variable or use current directory
    log_dir = os.getenv("LOG_DIR", os.getcwd())
    log_file_path = os.path.abspath(
        os.path.join(log_dir, "lightrag_compatible_demo.log")
    )

    print(f"\nLightRAG compatible demo log file: {log_file_path}\n")
    os.makedirs(os.path.dirname(log_dir), exist_ok=True)

    # Get log file max size and backup count from environment variables
    log_max_bytes = int(os.getenv("LOG_MAX_BYTES", 10485760))  # Default 10MB
    log_backup_count = int(os.getenv("LOG_BACKUP_COUNT", 5))  # Default 5 backups

    logging.config.dictConfig(
        {
            "version": 1,
            "disable_existing_loggers": False,
            "formatters": {
                "default": {
                    "format": "%(levelname)s: %(message)s",
                },
                "detailed": {
                    "format": "%(asctime)s - %(name)s - %(levelname)s - %(message)s",
                },
            },
            "handlers": {
                "console": {
                    "formatter": "default",
                    "class": "logging.StreamHandler",
                    "stream": "ext://sys.stderr",
                },
                "file": {
                    "formatter": "detailed",
                    "class": "logging.handlers.RotatingFileHandler",
                    "filename": log_file_path,
                    "maxBytes": log_max_bytes,
                    "backupCount": log_backup_count,
                    "encoding": "utf-8",
                },
            },
            "loggers": {
                "lightrag": {
                    "handlers": ["console", "file"],
                    "level": "INFO",
                    "propagate": False,
                },
            },
        }
    )

    # Set the logger level to INFO
    logger.setLevel(logging.INFO)
    # Enable verbose debug if needed
    set_verbose_debug(os.getenv("VERBOSE_DEBUG", "false").lower() == "true")


if not os.path.exists(WORKING_DIR):
    os.mkdir(WORKING_DIR)


async def llm_model_func(
    prompt, system_prompt=None, history_messages=[], keyword_extraction=False, **kwargs
) -> str:
    return await openai_complete_if_cache(
        "deepseek-chat",
        prompt,
        system_prompt=system_prompt,
        history_messages=history_messages,
        api_key=os.getenv("OPENAI_API_KEY"),
        base_url="https://api.deepseek.com",
        **kwargs,
    )


async def embedding_func(texts: list[str]) -> np.ndarray:
    return await ollama_embed(
        texts=texts,
        embed_model="bge-m3:latest",
        host="http://m4.lan.znipower.com:11434",
    )


async def get_embedding_dim():
    test_text = ["This is a test sentence."]
    embedding = await embedding_func(test_text)
    embedding_dim = embedding.shape[1]
    return embedding_dim


# function test
async def test_funcs():
    result = await llm_model_func("How are you?")
    print("llm_model_func: ", result)

    result = await embedding_func(["How are you?"])
    print("embedding_func: ", result)


# asyncio.run(test_funcs())


async def print_stream(stream):
    async for chunk in stream:
        if chunk:
            print(chunk, end="", flush=True)


async def initialize_rag():
    embedding_dimension = await get_embedding_dim()
    print(f"Detected embedding dimension: {embedding_dimension}")

    rag = LightRAG(
        working_dir=WORKING_DIR,
        llm_model_func=llm_model_func,
        embedding_func=EmbeddingFunc(
            embedding_dim=embedding_dimension,
            max_token_size=8192,
            func=embedding_func,
        ),
    )

    await rag.initialize_storages()
    await initialize_pipeline_status()

    return rag


async def main():
    try:
        # Initialize RAG instance
        rag = await initialize_rag()

        with open("./book.txt", "r", encoding="utf-8") as f:
            await rag.ainsert(f.read())

        # Perform naive search
        print("\n=====================")
        print("Query mode: naive")
        print("=====================")
        resp = await rag.aquery(
            "What are the top themes in this story?",
            param=QueryParam(mode="naive", stream=True),
        )
        if inspect.isasyncgen(resp):
            await print_stream(resp)
        else:
            print(resp)

        # Perform local search
        print("\n=====================")
        print("Query mode: local")
        print("=====================")
        resp = await rag.aquery(
            "What are the top themes in this story?",
            param=QueryParam(mode="local", stream=True),
        )
        if inspect.isasyncgen(resp):
            await print_stream(resp)
        else:
            print(resp)

        # Perform global search
        print("\n=====================")
        print("Query mode: global")
        print("=====================")
        resp = await rag.aquery(
            "What are the top themes in this story?",
            param=QueryParam(mode="global", stream=True),
        )
        if inspect.isasyncgen(resp):
            await print_stream(resp)
        else:
            print(resp)

        # Perform hybrid search
        print("\n=====================")
        print("Query mode: hybrid")
        print("=====================")
        resp = await rag.aquery(
            "What are the top themes in this story?",
            param=QueryParam(mode="hybrid", stream=True),
        )
        if inspect.isasyncgen(resp):
            await print_stream(resp)
        else:
            print(resp)

    except Exception as e:
        print(f"An error occurred: {e}")
    finally:
        if rag:
            await rag.finalize_storages()


if __name__ == "__main__":
    # Configure logging before running the main function
    configure_logging()
    asyncio.run(main())
    print("\nDone!")
