"""Utility functions for gathering system information."""

# Standard Library
import os
import platform
from typing import Dict, Tuple, Union

# Third Party
import psutil as _psutil
from cpuinfo import get_cpu_info as _get_cpu_info  # type: ignore

# Project
from hyperglass.constants import __version__

# Local
from .frontend import get_node_version

SystemData = Dict[str, Tuple[Union[str, int], str]]


def _cpu() -> SystemData:
    """Construct CPU Information."""
    cpu_info = _get_cpu_info()
    brand = cpu_info.get("brand_raw", "")
    cores_logical = _psutil.cpu_count()
    cores_raw = _psutil.cpu_count(logical=False)
    cpu_ghz = _psutil.cpu_freq().current / 1000
    return (brand, cores_logical, cores_raw, cpu_ghz)


def _memory() -> SystemData:
    """Construct RAM Information."""
    mem_info = _psutil.virtual_memory()
    total_gb = round(mem_info.total / 1e9, 2)
    usage_percent = mem_info.percent
    return (total_gb, usage_percent)


def _disk() -> SystemData:
    """Construct Disk Information."""
    disk_info = _psutil.disk_usage("/")
    total_gb = round(disk_info.total / 1e9, 2)
    usage_percent = disk_info.percent
    return (total_gb, usage_percent)


def get_system_info() -> SystemData:
    """Get system info."""

    cpu_info, cpu_logical, cpu_physical, cpu_speed = _cpu()
    mem_total, mem_usage = _memory()
    disk_total, disk_usage = _disk()

    return {
        "hyperglass Version": (__version__, "text"),
        "hyperglass Path": (os.environ["hyperglass_directory"], "code"),
        "Python Version": (platform.python_version(), "code"),
        "Node Version": (".".join(str(v) for v in get_node_version()), "code"),
        "Platform Info": (platform.platform(), "code"),
        "CPU Info": (cpu_info, "text"),
        "Logical Cores": (cpu_logical, "code"),
        "Physical Cores": (cpu_physical, "code"),
        "Processor Speed": (f"{cpu_speed}GHz", "code"),
        "Total Memory": (f"{mem_total} GB", "text"),
        "Memory Utilization": (f"{mem_usage}%", "text"),
        "Total Disk Space": (f"{disk_total} GB", "text"),
        "Disk Utilization": (f"{disk_usage}%", "text"),
    }