"""Системная статистика: диск хранилища, CPU, RAM, аптайм."""
from __future__ import annotations

import os
import shutil
import time

import psutil

from ..config import Config

_START = time.time()


def storage_disk(path: str) -> dict:
    """Использование диска, на котором лежит path (для одного хранилища)."""
    try:
        usage = shutil.disk_usage(path)
        return {
            "total_gb": round(usage.total / 1024 ** 3, 1),
            "used_gb": round(usage.used / 1024 ** 3, 1),
            "free_gb": round(usage.free / 1024 ** 3, 1),
            "percent": round(usage.used / usage.total * 100, 1) if usage.total else 0,
        }
    except OSError:
        return {"total_gb": 0, "used_gb": 0, "free_gb": 0, "percent": 0}


def is_mounted(path: str) -> bool:
    """Точка монтирования? (для NAS — признак, что том реально подключён)."""
    try:
        return os.path.ismount(path)
    except OSError:
        return False


def system_stats(config: Config) -> dict:
    active = config.active_storage()
    path = active.path
    vm = psutil.virtual_memory()
    return {
        "uptime_s": int(time.time() - _START),
        "cpu_percent": psutil.cpu_percent(interval=None),
        "ram_percent": vm.percent,
        "ram_used_gb": round(vm.used / 1024 ** 3, 1),
        "ram_total_gb": round(vm.total / 1024 ** 3, 1),
        "storage_path": path,
        "disk": storage_disk(path),
        "quota_gb": active.quota_gb,
        "retention_days": config.storage.retention_days,
        "segment_seconds": config.storage.segment_seconds,
    }