# app/utils.py
import json
import time
from pathlib import Path
from typing import Dict

# --- Constants ---
UPLOAD_ROOT = Path("/tmp/triflix_uploader")

# --- Upload Management ---
def get_upload_dir(upload_id: str) -> Path:
    """Returns the directory for a given upload."""
    return UPLOAD_ROOT / upload_id

def load_meta(upload_id: str) -> dict:
    """Loads metadata for an upload from its meta.json file."""
    meta_path = get_upload_dir(upload_id) / "meta.json"
    if not meta_path.exists():
        raise FileNotFoundError("Upload metadata not found.")
    return json.loads(meta_path.read_text())

def save_meta(upload_id: str, meta: dict):
    """Saves metadata for an upload to its meta.json file."""
    meta_path = get_upload_dir(upload_id) / "meta.json"
    meta_path.parent.mkdir(parents=True, exist_ok=True)
    meta_path.write_text(json.dumps(meta, indent=2))

# --- Rate Limiting ---
rate_limit_store: Dict[str, list] = {}

def enforce_rate_limit(ip: str, limit: int = 10, per_seconds: int = 60) -> bool:
    """Simple in-memory rate limiter. Returns True if allowed, False if denied."""
    now = time.time()
    timestamps = rate_limit_store.setdefault(ip, [])
    # Remove timestamps older than the window
    timestamps[:] = [t for t in timestamps if t > now - per_seconds]
    if len(timestamps) >= limit:
        return False
    timestamps.append(now)
    return True