from __future__ import annotations
import os
from pydantic_settings import BaseSettings
from pydantic import Field

class Settings(BaseSettings):
    BACKEND_LLM: str = Field(default="llamacpp")  # 'llamacpp' | 'openai' | 'groq'
    LLAMACPP_MODEL_PATH: str = Field(default="models/qwen2.5-1.5b-instruct-q4_k_m.gguf")

    N_CTX: int = 4096
    N_THREADS: int = 4
    N_GPU_LAYERS: int = 0

    ASR_DEVICE: str = "mps"  # 'mps' or 'cpu'
    TTS_ENGINE: str = "pyttsx3"  # 'pyttsx3' | 'say' | 'piper' (later)

    OPENAI_API_KEY: str | None = None
    GROQ_API_KEY: str | None = None

    IS_HF_SPACE: bool = False
    DEBUG: bool = True

    class Config:
        env_file = ".env"
        extra = "ignore"

    def pretty(self) -> dict:
        d = self.model_dump()
        if d.get("OPENAI_API_KEY"):
            d["OPENAI_API_KEY"] = True
        if d.get("GROQ_API_KEY"):
            d["GROQ_API_KEY"] = True
        return d

_settings: Settings | None = None

def get_settings() -> Settings:
    global _settings
    if _settings is None:
        _settings = Settings()
    return _settings