import os
import gc
import shutil
import logging
from pathlib import Path
from huggingface_hub import WebhooksServer, WebhookPayload
from datasets import Dataset, load_dataset, disable_caching
from fastapi import BackgroundTasks, Response, status
from huggingface_hub.utils import build_hf_headers, get_session

disable_caching()

# Set up the logger
logger = logging.getLogger("basic_logger")
logger.setLevel(logging.INFO)

# Set up the console handler with a simple format
console_handler = logging.StreamHandler()
console_handler.setLevel(logging.INFO)
formatter = logging.Formatter("%(asctime)s - %(name)s - %(levelname)s - %(message)s")
console_handler.setFormatter(formatter)
logger.addHandler(console_handler)

# Environment variables
DS_NAME = "amaye15/object-segmentation"
DATA_DIR = "data"
TARGET_REPO = "amaye15/tmp"
WEBHOOK_SECRET = os.getenv("HF_WEBHOOK_SECRET", "my_secret_key")


def get_data():
    """
    Generator function to stream data from the dataset.
    """
    ds = load_dataset(
        DS_NAME,
        cache_dir=os.path.join(os.getcwd(), DATA_DIR),
        streaming=True,
        download_mode="force_redownload",
    )
    for row in ds["train"]:
        yield row
    gc.collect()


def process_and_push_data():
    """
    Function to process and push new data to the target repository.
    """
    p = os.path.join(os.getcwd(), DATA_DIR)

    if os.path.exists(p):
        shutil.rmtree(p)

    os.mkdir(p)

    ds_processed = Dataset.from_generator(get_data)
    ds_processed.push_to_hub(TARGET_REPO)
    logger.info("Data processed and pushed to the hub.")
    gc.collect()


# Initialize the WebhooksServer with Gradio interface (if needed)
app = WebhooksServer(webhook_secret=WEBHOOK_SECRET)


@app.add_webhook("/dataset_repo")
async def handle_repository_changes(
    payload: WebhookPayload, task_queue: BackgroundTasks
):
    """
    Webhook endpoint that triggers data processing when the dataset is updated.
    """
    if not payload.event.scope.startswith("repo"):
        return Response("No task scheduled", status_code=status.HTTP_200_OK)

    # Only run if change is on main branch
    try:
        if payload.updatedRefs[0].ref != "refs/heads/main":
            response_content = "No task scheduled: Change not on main branch"
            logger.info(response_content)
            return Response(response_content, status_code=status.HTTP_200_OK)
    except Exception as e:
        logger.error(f"Error checking branch: {str(e)}")
        return Response("No task scheduled", status_code=status.HTTP_200_OK)

    # No need to run for README only updates
    try:
        commit_files_url = f"{payload.repo.url.api}/compare/{payload.updatedRefs[0].oldSha}..{payload.updatedRefs[0].newSha}?raw=true"
        response_text = (
            get_session().get(commit_files_url, headers=build_hf_headers()).text
        )
        logger.info(f"Git Compare URL: {commit_files_url}")

        # Splitting the output into lines
        file_lines = response_text.split("\n")

        # Filtering the lines to find file changes
        changed_files = [line.split("\t")[-1] for line in file_lines if line.strip()]
        logger.info(f"Changed files: {changed_files}")

        # Checking if only README.md has been changed
        if all("README.md" in file for file in changed_files):
            response_content = "No task scheduled: It's a README only update."
            logger.info(response_content)
            return Response(response_content, status_code=status.HTTP_200_OK)
    except Exception as e:
        logger.error(f"Error checking files: {str(e)}")
        return Response("Unexpected issue", status_code=status.HTTP_501_NOT_IMPLEMENTED)

    logger.info(
        f"Webhook received from {payload.repo.name} indicating a repo {payload.event.action}"
    )
    task_queue.add_task(_process_webhook)
    return Response("Task scheduled.", status_code=status.HTTP_202_ACCEPTED)


def _process_webhook():
    logger.info(f"Loading new dataset...")
    # dataset = load_dataset(DS_NAME)
    logger.info(f"Loaded new dataset")

    logger.info(f"Processing and updating dataset...")
    process_and_push_data()
    logger.info(f"Processing and updating dataset completed!")


if __name__ == "__main__":
    app.launch(server_name="0.0.0.0", show_error=True, server_port=7860)