from contextvars import ContextVar
from pathlib import Path

from pydantic import Field
from pydantic_settings import BaseSettings
from pydantic_settings import SettingsConfigDict

DEFAULT_ENV_FILE = Path(".env").resolve()
_REPO_ROOT = Path(__file__).resolve().parents[3]


class Settings(BaseSettings):
    """Runtime settings for the HTTP MCP and docs server."""

    model_config = SettingsConfigDict(
        env_file=DEFAULT_ENV_FILE,
        env_prefix="PERSONAL_MCP_",
        extra="ignore",
    )

    host: str = "127.0.0.1"
    port: int = 8000
    debug: bool = False
    log_level: str = "info"
    docs_route: str = "/docs"
    mcp_route: str = "/mcp"
    site_dir: Path = Field(default=_REPO_ROOT / "site")


_settings: ContextVar[Settings | None] = ContextVar("settings", default=None)


def get_settings() -> Settings:
    settings = _settings.get()
    if settings is None:
        settings = Settings()
        _settings.set(settings)
    return settings