import logging
import time
from datetime import datetime, timedelta
from pathlib import Path

import h5py

from . import protocols

logger = logging.getLogger(__name__)


def start_processing(
    file_path: Path,
    csi_callback: protocols.CSICallback | None = None,
) -> None:
    logger.info(f"Replaying CSI data from {file_path}")
    with h5py.File(file_path, "r") as file:
        try:
            for key in file:
                datetime.fromisoformat(key)
        except ValueError as e:
            logger.exception(
                "The file provided was not generated using this software", e
            )

        start_time = datetime.fromisoformat(list(file.keys())[0])
        target_offset = datetime.now() - start_time
        for key in file:
            logger.debug(f"Sending data from {key} at {datetime.now().isoformat()}")
            csi_callback(file[key][:])
            curr_time_virtual = datetime.fromisoformat(key)
            new_offset = datetime.now() - curr_time_virtual
            logger.debug(f"New offset {new_offset}, target is {target_offset}")
            if new_offset > target_offset + timedelta(seconds=1):
                logger.warning(
                    f"Data is {new_offset - target_offset} behind, lagging behind..."
                )
            time.sleep(max(0, (target_offset - new_offset).total_seconds()))