from __future__ import annotations

import os
from dataclasses import dataclass
from pathlib import Path

from dotenv import load_dotenv


ROOT_DIR = Path(__file__).resolve().parents[2]
load_dotenv(ROOT_DIR / ".env")


@dataclass(frozen=True)
class Settings:
    root_dir: Path = ROOT_DIR
    chroma_dir: Path = ROOT_DIR / "data" / "chroma"
    processed_dir: Path = ROOT_DIR / "data" / "processed"
    uploads_dir: Path = ROOT_DIR / "data" / "uploads"
    collection_name: str = os.getenv("CHROMA_COLLECTION", "class12_math_rag")
    ollama_base_url: str = os.getenv("OLLAMA_BASE_URL", "http://127.0.0.1:11434")
    llm_model: str = os.getenv("OLLAMA_LLM_MODEL", "qwen2.5:7b-instruct")
    embed_model: str = os.getenv("OLLAMA_EMBED_MODEL", "nomic-embed-text")
    chunk_size: int = 1200
    chunk_overlap: int = 200
    top_k: int = int(os.getenv("TOP_K", "5"))
    request_timeout: int = 120


def get_settings() -> Settings:
    return Settings()