from __future__ import annotations

import dataclasses
from pathlib import Path
from typing import Any

import yaml

from configs.models import (
    AppConfig,
    AudioConfig,
    DeadBugConfig,
    LoggingConfig,
    ModelConfig,
    ServerConfig,
    VideoConfig,
)

_PROJECT_ROOT = Path(__file__).resolve().parent.parent

_SECTION_CLASS = {
    "server": ServerConfig,
    "video": VideoConfig,
    "model": ModelConfig,
    "dead_bug": DeadBugConfig,
    "audio": AudioConfig,
    "logging": LoggingConfig,
}


def _dict_to_dataclass(cls: type, data: dict[str, Any] | None) -> dict[str, Any]:
    if data is None:
        return {}
    field_names = {f.name for f in dataclasses.fields(cls)}
    return {k: v for k, v in data.items() if k in field_names}


def _read_yaml(path: Path) -> dict[str, Any]:
    if not path.exists():
        return {}
    with open(path, encoding="utf-8") as f:
        return yaml.safe_load(f) or {}


def load_config(config_path: str | Path | None = None) -> AppConfig:
    if config_path is None:
        config_path = _PROJECT_ROOT / "config.yaml"

    raw = _read_yaml(Path(config_path))

    return AppConfig(**{
        section: cls(**_dict_to_dataclass(cls, raw.get(section)))
        for section, cls in _SECTION_CLASS.items()
    })


config = load_config()