from functools import cache
from pathlib import Path
from typing import Literal

from pydantic import BaseModel
from pydantic import DirectoryPath
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[2]


class Mounts(BaseModel):
    docs: str = "/docs"
    mcp: str = "/mcp"


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",
    )

    debug: bool = False
    log_level: str = "info"
    mounts: Mounts = Field(default_factory=Mounts)
    mcp_transport: Literal["http", "sse"] = "http"
    site_dir: DirectoryPath = Field(default=_REPO_ROOT / "site")


@cache
def get_settings(**overrides) -> Settings:
    return Settings(**overrides)


def refresh_settings(**overrides):
    get_settings.cache_clear()
    return get_settings(**overrides)