from __future__ import annotations

import os
from pathlib import Path
from functools import lru_cache


BASE_DIR = Path(__file__).resolve().parents[3]
STATIC_DIR = BASE_DIR / "static"
AUDIO_DIR = STATIC_DIR / "audio"
MODEL_CACHE_DIR = BASE_DIR / "tmp" / "models"
FRONTEND_DIR = BASE_DIR / "frontend"
TMP_DIR = BASE_DIR / "tmp"

# Ensure required directories exist
for directory in (STATIC_DIR, AUDIO_DIR, MODEL_CACHE_DIR, TMP_DIR, FRONTEND_DIR):
    directory.mkdir(parents=True, exist_ok=True)


class Settings:
    app_name: str = "VoxSum Studio API"
    static_dir: Path = STATIC_DIR
    audio_dir: Path = AUDIO_DIR
    frontend_dir: Path = FRONTEND_DIR
    tmp_dir: Path = TMP_DIR
    model_cache_dir: Path = MODEL_CACHE_DIR
    max_audio_files: int = int(os.environ.get("VOXSUM_MAX_AUDIO_FILES", "20"))
    transcription_chunk_size: int = 100


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