import os
from pathlib import Path

from dotenv import load_dotenv

# Load both potential env file locations.
_APP_DIR = Path(__file__).resolve().parent
_ROOT_ENV = _APP_DIR.parent / ".env"
_APP_ENV = _APP_DIR / ".env"

load_dotenv(dotenv_path=_ROOT_ENV, override=False)
load_dotenv(dotenv_path=_APP_ENV, override=True)


class Settings:
    gemini_api_key: str = os.getenv("GEMINI_API_KEY", "")
    embedding_model_name: str = os.getenv(
        "EMBEDDING_MODEL_NAME",
        "sentence-transformers/all-MiniLM-L6-v2",
    )
    student_performance_url_template: str = os.getenv(
        "STUDENT_PERFORMANCE_URL_TEMPLATE",
        "https://git-connect-backend-v2.vercel.app/api/student/{student_id}/performance/{semester}",
    )
    rag_index_db_url: str = os.getenv("RAG_INDEX_DB_URL", "")
    neon_max_retries: int = int(os.getenv("NEON_MAX_RETRIES", "5"))
    neon_retry_backoff_sec: float = float(os.getenv("NEON_RETRY_BACKOFF_SEC", "1.0"))
    neon_connect_timeout_sec: int = int(os.getenv("NEON_CONNECT_TIMEOUT_SEC", "10"))
    vector_data_dir: str = os.getenv("VECTOR_DATA_DIR", "data/vector_index")
    raw_text_dir: str = os.getenv("RAW_TEXT_DIR", "data/raw_text")
    gemini_model: str = os.getenv("GEMINI_MODEL", "gemini-2.5-flash")
    pdf_timeout_sec: int = int(os.getenv("PDF_TIMEOUT_SEC", "60"))
    pdf_max_retries: int = int(os.getenv("PDF_MAX_RETRIES", "3"))
    pdf_retry_backoff_sec: float = float(os.getenv("PDF_RETRY_BACKOFF_SEC", "1.5"))
    rag_chunk_size: int = int(os.getenv("RAG_CHUNK_SIZE", "1400"))
    rag_chunk_overlap: int = int(os.getenv("RAG_CHUNK_OVERLAP", "250"))
    rag_syllabus_top_k: int = int(os.getenv("RAG_SYLLABUS_TOP_K", "8"))


settings = Settings()