from __future__ import annotations

from functools import lru_cache
from pathlib import Path

from pydantic import Field, model_validator
from pydantic_settings import BaseSettings, SettingsConfigDict


class Settings(BaseSettings):
    model_config = SettingsConfigDict(env_file=".env", env_file_encoding="utf-8", extra="ignore")

    app_name: str = "memory-gateway"
    app_env: str = "dev"
    default_branch: str = "main"

    git_remote_url: str = Field(default="", description="Upstream git remote URL or local path")
    git_mirror_path: Path = Path("/data/git-mirror/repo.git")
    workspaces_root: Path = Path("/data/workspaces")
    workspace_state_dir: Path | None = None

    qmd_binary: str = "qmd"
    qmd_timeout_seconds: int = 300
    qmd_top_k: int = 5
    qmd_index_prefix: str = "ws"
    qmd_update_on_latest_query: bool = True
    qmd_embed_on_change: bool = True

    xdg_cache_home: Path = Path("/var/lib/qmd/cache")
    xdg_config_home: Path = Path("/var/lib/qmd/config")

    @model_validator(mode="after")
    def _normalize_paths(self) -> "Settings":
        if self.workspace_state_dir is None:
            self.workspace_state_dir = self.workspaces_root / ".gateway-state"
        return self


@lru_cache(maxsize=1)
def get_settings() -> Settings:
    return Settings()