import dataclasses
import logging
import os
from typing import Any, Dict, List, Optional

import numpy as np
from sqlitedict import SqliteDict

__all__ = ["Loggers"]

from llm_studio.src.utils.plot_utils import PLOT_ENCODINGS

logger = logging.getLogger(__name__)


def get_cfg(cfg: Any) -> Dict:
    """Returns simplified config elements

    Args:
        cfg: configuration

    Returns:
        Dict of config elements
    """

    items: Dict = {}
    type_annotations = cfg.get_annotations()

    cfg_dict = cfg.__dict__

    cfg_dict = {key: cfg_dict[key] for key in cfg._get_order(warn_if_unset=False)}

    for k, v in cfg_dict.items():
        if k.startswith("_") or cfg._get_visibility(k) < 0:
            continue

        if any([x in k for x in ["api"]]):
            continue

        if dataclasses.is_dataclass(v):
            elements_group = get_cfg(cfg=v)
            t = elements_group
            items = {**items, **t}
        else:
            type_annotation = type_annotations[k]
            if type_annotation == float:
                items[k] = float(v)
            else:
                items[k] = v

    return items


class NeptuneLogger:
    def __init__(self, cfg: Any):
        import neptune as neptune
        from neptune.utils import stringify_unsupported

        if cfg.logging._neptune_debug:
            mode = "debug"
        else:
            mode = "async"

        self.logger = neptune.init_run(
            project=cfg.logging.neptune_project,
            api_token=os.getenv("NEPTUNE_API_TOKEN", ""),
            name=cfg.experiment_name,
            mode=mode,
            capture_stdout=False,
            capture_stderr=False,
            source_files=[],
        )

        self.logger["cfg"] = stringify_unsupported(get_cfg(cfg))

    def log(self, subset: str, name: str, value: Any, step: Optional[int] = None):
        name = f"{subset}/{name}"
        self.logger[name].append(value, step=step)


class LocalLogger:
    def __init__(self, cfg: Any):
        logging.getLogger("sqlitedict").setLevel(logging.ERROR)

        self.logs = f"{cfg.output_directory}/charts.db"

        params = get_cfg(cfg)

        with SqliteDict(self.logs) as logs:
            logs["cfg"] = params
            logs.commit()

    def log(self, subset: str, name: str, value: Any, step: Optional[int] = None):
        if subset in PLOT_ENCODINGS:
            with SqliteDict(self.logs) as logs:
                if subset not in logs:
                    subset_dict = dict()
                else:
                    subset_dict = logs[subset]
                subset_dict[name] = value
                logs[subset] = subset_dict
                logs.commit()
            return

        # https://github.com/h2oai/wave/issues/447
        if np.isnan(value):
            value = None
        else:
            value = float(value)
        with SqliteDict(self.logs) as logs:
            if subset not in logs:
                subset_dict = dict()
            else:
                subset_dict = logs[subset]
            if name not in subset_dict:
                subset_dict[name] = {"steps": [], "values": []}

            subset_dict[name]["steps"].append(step)
            subset_dict[name]["values"].append(value)

            logs[subset] = subset_dict
            logs.commit()


class DummyLogger:
    def __init__(self, cfg: Optional[Any] = None):
        return

    def log(self, subset: str, name: str, value: Any, step: Optional[int] = None):
        return


class MainLogger:
    """Main logger"""

    def __init__(self, cfg: Any):
        self.loggers = {
            "local": LocalLogger(cfg),
            "external": Loggers.get(cfg.logging.logger),
        }

        try:
            self.loggers["external"] = self.loggers["external"](cfg)
        except Exception as e:
            logger.warning(
                f"Error when initializing logger. "
                f"Disabling custom logging functionality. "
                f"Please ensure logger configuration is correct and "
                f"you have a stable Internet connection: {e}"
            )
            self.loggers["external"] = DummyLogger(cfg)

    def reset_external(self):
        self.loggers["external"] = DummyLogger()

    def log(self, subset: str, name: str, value: str | float, step: float = None):
        for k, logger in self.loggers.items():
            if "validation_predictions" in name and k == "external":
                continue
            if subset == "internal" and not isinstance(logger, LocalLogger):
                continue
            logger.log(subset=subset, name=name, value=value, step=step)


class Loggers:
    """Loggers factory."""

    _loggers = {"None": DummyLogger, "Neptune": NeptuneLogger}

    @classmethod
    def names(cls) -> List[str]:
        return sorted(cls._loggers.keys())

    @classmethod
    def get(cls, name: str) -> Any:
        """Access to Loggers.

        Args:
            name: loggers name
        Returns:
            A class to build the Loggers
        """

        return cls._loggers.get(name, DummyLogger)