import os
import platform
import socket
import sys

from datetime import datetime, timedelta
from datetime import timezone as tz
from typing import List

import psutil

from utils.timezone import timezone


class ServerInfo:
    @staticmethod
    def format_bytes(size) -> str:
        """格式化字节"""
        factor = 1024
        for unit in ['', 'K', 'M', 'G', 'T', 'P', 'E', 'Z']:
            if abs(size) < factor:
                return f'{size:.2f} {unit}B'
            size /= factor
        return f'{size:.2f} YB'

    @staticmethod
    def fmt_seconds(seconds: int) -> str:
        days, rem = divmod(int(seconds), 86400)
        hours, rem = divmod(rem, 3600)
        minutes, seconds = divmod(rem, 60)
        parts = []
        if days:
            parts.append('{} 天'.format(days))
        if hours:
            parts.append('{} 小时'.format(hours))
        if minutes:
            parts.append('{} 分钟'.format(minutes))
        if seconds:
            parts.append('{} 秒'.format(seconds))
        if len(parts) == 0:
            return '0 秒'
        else:
            return ' '.join(parts)

    @staticmethod
    def fmt_timedelta(td: timedelta) -> str:
        """格式化时间差"""
        total_seconds = round(td.total_seconds())
        return ServerInfo.fmt_seconds(total_seconds)

    @staticmethod
    def get_cpu_info() -> dict:
        """获取 CPU 信息"""
        cpu_info = {'usage': round(psutil.cpu_percent(interval=1, percpu=False), 2)}  # %

        # 检查是否是 Apple M系列芯片
        if platform.system() == 'Darwin' and 'arm' in platform.machine().lower():
            cpu_info['max_freq'] = 0
            cpu_info['min_freq'] = 0
            cpu_info['current_freq'] = 0
        else:
            try:
                # CPU 频率信息，最大、最小和当前频率
                cpu_freq = psutil.cpu_freq()
                cpu_info['max_freq'] = round(cpu_freq.max, 2)  # MHz
                cpu_info['min_freq'] = round(cpu_freq.min, 2)  # MHz
                cpu_info['current_freq'] = round(cpu_freq.current, 2)  # MHz
            except FileNotFoundError:
                # 处理无法获取频率的情况
                cpu_info['max_freq'] = 0
                cpu_info['min_freq'] = 0
                cpu_info['current_freq'] = 0
            except AttributeError:
                # 处理属性不存在的情况（更安全的做法）
                cpu_info['max_freq'] = 0
                cpu_info['min_freq'] = 0
                cpu_info['current_freq'] = 0

        # CPU 逻辑核心数，物理核心数
        cpu_info['logical_num'] = psutil.cpu_count(logical=True)
        cpu_info['physical_num'] = psutil.cpu_count(logical=False)
        return cpu_info

    @staticmethod
    def get_mem_info() -> dict:
        """获取内存信息"""
        mem = psutil.virtual_memory()
        return {
            'total': round(mem.total / 1024 / 1024 / 1024, 2),  # GB
            'used': round(mem.used / 1024 / 1024 / 1024, 2),  # GB
            'free': round(mem.available / 1024 / 1024 / 1024, 2),  # GB
            'usage': round(mem.percent, 2),  # %
        }

    @staticmethod
    def get_sys_info() -> dict:
        """获取服务器信息"""
        try:
            with socket.socket(socket.AF_INET, socket.SOCK_DGRAM) as sk:
                sk.connect(('8.8.8.8', 80))
                ip = sk.getsockname()[0]
        except socket.gaierror:
            ip = '127.0.0.1'
        return {'name': socket.gethostname(), 'ip': ip, 'os': platform.system(), 'arch': platform.machine()}

    @staticmethod
    def get_disk_info() -> List[dict]:
        """获取磁盘信息"""
        disk_info = []
        for disk in psutil.disk_partitions():
            usage = psutil.disk_usage(disk.mountpoint)
            disk_info.append({
                'dir': disk.mountpoint,
                'type': disk.fstype,
                'device': disk.device,
                'total': ServerInfo.format_bytes(usage.total),
                'free': ServerInfo.format_bytes(usage.free),
                'used': ServerInfo.format_bytes(usage.used),
                'usage': f'{round(usage.percent, 2)} %',
            })
        return disk_info

    @staticmethod
    def get_service_info():
        """获取服务信息"""
        process = psutil.Process(os.getpid())
        mem_info = process.memory_info()
        start_time = timezone.f_datetime(datetime.utcfromtimestamp(process.create_time()).replace(tzinfo=tz.utc))
        return {
            'name': 'Python3',
            'version': platform.python_version(),
            'home': sys.executable,
            'cpu_usage': f'{round(process.cpu_percent(interval=1), 2)} %',
            'mem_vms': ServerInfo.format_bytes(mem_info.vms),  # 虚拟内存, 即当前进程申请的虚拟内存
            'mem_rss': ServerInfo.format_bytes(mem_info.rss),  # 常驻内存, 即当前进程实际使用的物理内存
            'mem_free': ServerInfo.format_bytes(mem_info.vms - mem_info.rss),  # 空闲内存
            'startup': start_time,
            'elapsed': f'{ServerInfo.fmt_timedelta(timezone.now() - start_time)}',
        }


server_info = ServerInfo()