import sys
import typing
from functools import lru_cache
from pathlib import Path

from huggingface_hub import snapshot_download
from loguru import logger

from src.envs import settings
from src.schemas.display_toml import DisplayToml
from src.schemas.meta_toml import MetaToml
from src.utils.hf import restart_space

if typing.TYPE_CHECKING:
    from src.schemas.meta_toml import MetaToml_Benchmark

if sys.version_info < (3, 11):
    from tomli import load as toml_load
else:
    from tomllib import load as toml_load


# Use cache to avoid downloading the same data multiple times
@lru_cache(maxsize=1)
def prepare_space():
    """Space initialisation"""
    download_results()
    download_queue()


def download_results():
    try:
        snapshot_download(
            repo_id=settings.QUEUE_REPO_ID,
            local_dir=settings.EVAL_REQUESTS_PATH,
            repo_type="dataset",
            tqdm_class=None,
            etag_timeout=30,
            token=settings.HF_TOKEN.get_secret_value(),
        )
        logger.info("Downloaded eval queue")
    except Exception as e:
        logger.error(f"Error downloading eval queue: {e!s}")
        restart_space(settings.REPO_ID)


def download_queue():
    try:
        snapshot_download(
            repo_id=settings.RESULTS_REPO_ID,
            local_dir=settings.EVAL_RESULTS_PATH,
            repo_type="dataset",
            tqdm_class=None,
            etag_timeout=30,
            allow_patterns=["leaderboard/*.toml", "leaderboard/**/*.json"],
            token=settings.HF_TOKEN.get_secret_value(),
        )
        logger.info("Downloaded eval results")
    except Exception as e:
        logger.error(f"Error downloading eval queue: {e!s}")
        restart_space(settings.REPO_ID)


@lru_cache(maxsize=1)
def load_meta_toml() -> "MetaToml":
    prepare_space()

    meta_toml_path = Path(settings.EVAL_RESULTS_PATH) / "leaderboard" / "meta.toml"
    logger.info(f'Loading meta.toml from: {meta_toml_path.as_posix()!r}')
    with meta_toml_path.open("rb") as f:
        data = toml_load(f)
    meta_toml = MetaToml.model_validate(data)
    logger.info("Loaded meta.toml")
    assert meta_toml is not None, f"Failed to load meta.toml: {meta_toml_path.as_posix()!r}"
    return meta_toml


@lru_cache(maxsize=1)
def load_display_toml() -> "DisplayToml":
    prepare_space()

    display_toml_path = Path(settings.EVAL_RESULTS_PATH) / "leaderboard" / "display.toml"
    logger.info(f'Loading display.toml from: {display_toml_path.as_posix()!r}')
    with display_toml_path.open("rb") as f:
        data = toml_load(f)
    display_toml = DisplayToml.model_validate(data)
    logger.info("Loaded display.toml")
    assert display_toml is not None, f"Failed to load display.toml: {display_toml_path.as_posix()!r}"
    return display_toml


@lru_cache(maxsize=1)
def get_benchmarks() -> list["MetaToml_Benchmark"]:
    meta_toml = load_meta_toml()
    benchmarks = list(meta_toml.benchmarks)
    # Sort with None values at the end, maintaining stable order for None values
    # Use tuple (is_none, order_value) where is_none=True means it's None
    # False < True in boolean comparison, so non-None values come first
    benchmarks.sort(key=lambda x: (x.order is None, x.order if x.order is not None else 0))
    logger.info(f"Loaded {len(benchmarks)} benchmarks: titles={[b.title for b in benchmarks]!r}")
    return benchmarks