"""Rate-Limiting-Modul für Rippy API (pro Client-IP).

Der API-Key-Store, der hier früher lebte, ist mit dem Auth-Rückbau
(Commander-Entscheid 24.07.2026) entfernt — Heimnetz-only, siehe KONZEPT §10.
"""

import time
from collections import defaultdict
from typing import Dict

# Default Rate Limit
MAX_REQUESTS_PER_MINUTE = 100

# In-Memory Rate Limit Store (in Produktion mit Redis)
rate_limit_store: Dict[str, list] = defaultdict(list)


def check_rate_limit(client_id: str, max_requests: int = MAX_REQUESTS_PER_MINUTE, window_seconds: int = 60) -> bool:
    """Prüfe ob Client rate-limited ist."""
    current_time = time.time()
    window_start = current_time - window_seconds
    
    # Bereinige alte Einträge
    rate_limit_store[client_id] = [
        timestamp for timestamp in rate_limit_store[client_id]
        if timestamp > window_start
    ]
    
    # Prüfe ob Limit erreicht
    if len(rate_limit_store[client_id]) >= max_requests:
        return False
    
    # Füge neuen Request hinzu
    rate_limit_store[client_id].append(current_time)
    return True


def get_rate_limit_remaining(client_id: str, max_requests: int = MAX_REQUESTS_PER_MINUTE) -> int:
    """Hole verbleibende Requests."""
    current_time = time.time()
    window_start = current_time - 60
    
    current_count = len([
        timestamp for timestamp in rate_limit_store[client_id]
        if timestamp > window_start
    ])
    
    return max(0, max_requests - current_count)


def reset_rate_limit(client_id: str) -> None:
    """Setze Rate Limit für Client zurück."""
    rate_limit_store[client_id] = []