import os
import platform
from zoneinfo import ZoneInfo

windows_timezone_map = {
    "Dateline Standard Time": "Etc/GMT+12",
    "UTC-11": "Etc/GMT+11",
    "Aleutian Standard Time": "America/Adak",
    "Hawaiian Standard Time": "Pacific/Honolulu",
    "Marquesas Standard Time": "Pacific/Marquesas",
    "Alaskan Standard Time": "America/Anchorage",
    "UTC-09": "Etc/GMT+9",
    "Pacific Standard Time (Mexico)": "America/Tijuana",
    "UTC-08": "Etc/GMT+8",
    "Pacific Standard Time": "America/Los_Angeles",
    "US Mountain Standard Time": "America/Phoenix",
    "Mountain Standard Time (Mexico)": "America/Chihuahua",
    "Mountain Standard Time": "America/Denver",
    "Central America Standard Time": "America/Guatemala",
    "Central Standard Time": "America/Chicago",
    "Easter Island Standard Time": "Pacific/Easter",
    "Central Standard Time (Mexico)": "America/Mexico_City",
    "Canada Central Standard Time": "America/Regina",
    "SA Pacific Standard Time": "America/Bogota",
    "Eastern Standard Time (Mexico)": "America/Cancun",
    "Eastern Standard Time": "America/New_York",
    "Haiti Standard Time": "America/Port-au-Prince",
    "Cuba Standard Time": "America/Havana",
    "US Eastern Standard Time": "America/Indianapolis",
    "Turks And Caicos Standard Time": "America/Grand_Turk",
    "Paraguay Standard Time": "America/Asuncion",
    "Atlantic Standard Time": "America/Halifax",
    "Venezuela Standard Time": "America/Caracas",
    "Central Brazilian Standard Time": "America/Cuiaba",
    "SA Western Standard Time": "America/La_Paz",
    "Pacific SA Standard Time": "America/Santiago",
    "SA Eastern Standard Time": "America/Cayenne",
    "Argentina Standard Time": "America/Buenos_Aires",
    "Greenland Standard Time": "America/Godthab",
    "Montevideo Standard Time": "America/Montevideo",
    "Bahia Standard Time": "America/Bahia",
    "UTC-02": "Etc/GMT+2",
    "Azores Standard Time": "Atlantic/Azores",
    "Cape Verde Standard Time": "Atlantic/Cape_Verde",
    "UTC": "Etc/GMT",
    "GMT Standard Time": "Europe/London",
    "Greenwich Standard Time": "Atlantic/Reykjavik",
    "W. Europe Standard Time": "Europe/Berlin",
    "Central Europe Standard Time": "Europe/Budapest",
    "Romance Standard Time": "Europe/Paris",
    "Central European Standard Time": "Europe/Warsaw",
    "W. Central Africa Standard Time": "Africa/Lagos",
    "Namibia Standard Time": "Africa/Windhoek",
    "GTB Standard Time": "Europe/Bucharest",
    "Middle East Standard Time": "Asia/Beirut",
    "Egypt Standard Time": "Africa/Cairo",
    "Syria Standard Time": "Asia/Damascus",
    "E. Europe Standard Time": "Europe/Chisinau",
    "South Africa Standard Time": "Africa/Johannesburg",
    "FLE Standard Time": "Europe/Kiev",
    "Turkey Standard Time": "Europe/Istanbul",
    "Israel Standard Time": "Asia/Jerusalem",
    "Jordan Standard Time": "Asia/Amman",
    "Arabic Standard Time": "Asia/Riyadh",
    "Kaliningrad Standard Time": "Europe/Kaliningrad",
    "Arab Standard Time": "Asia/Riyadh",
    "E. Africa Standard Time": "Africa/Nairobi",
    "Iran Standard Time": "Asia/Tehran",
    "Arabian Standard Time": "Asia/Dubai",
    "Astrakhan Standard Time": "Europe/Astrakhan",
    "Russian Standard Time": "Europe/Moscow",
    "E. Europe Standard Time": "Europe/Chisinau",
    "W. Australia Standard Time": "Australia/Perth",
    "Moscow Standard Time": "Europe/Moscow",
    "Pakistan Standard Time": "Asia/Karachi",
    "India Standard Time": "Asia/Kolkata",
    "Sri Lanka Standard Time": "Asia/Colombo",
    "Nepal Standard Time": "Asia/Kathmandu",
    "Bangladesh Standard Time": "Asia/Dhaka",
    "Afghanistan Standard Time": "Asia/Kabul",
    "Myanmar Standard Time": "Asia/Yangon",
    "SE Asia Standard Time": "Asia/Bangkok",
    "North Asia Standard Time": "Asia/Krasnoyarsk",
    "China Standard Time": "Asia/Shanghai",
    "Singapore Standard Time": "Asia/Singapore",
    "W. Australia Standard Time": "Australia/Perth",
    "Taipei Standard Time": "Asia/Taipei",
    "Ulaanbaatar Standard Time": "Asia/Ulaanbaatar",
    "North Asia East Standard Time": "Asia/Irkutsk",
    "Korea Standard Time": "Asia/Seoul",
    "Tokyo Standard Time": "Asia/Tokyo",
    "Yakutsk Standard Time": "Asia/Yakutsk",
    "Cen. Australia Standard Time": "Australia/Adelaide",
    "AUS Central Standard Time": "Australia/Darwin",
    "E. Australia Standard Time": "Australia/Brisbane",
    "AUS Eastern Standard Time": "Australia/Sydney",
    "West Pacific Standard Time": "Pacific/Port_Moresby",
    "Tasmania Standard Time": "Australia/Hobart",
    "Magadan Standard Time": "Asia/Magadan",
    "Vladivostok Standard Time": "Asia/Vladivostok",
    "Russia Time Zone 10": "Asia/Srednekolymsk",
    "Central Pacific Standard Time": "Pacific/Guadalcanal",
    "Fiji Standard Time": "Pacific/Fiji",
    "New Zealand Standard Time": "Pacific/Auckland",
    "UTC+12": "Etc/GMT-12",
    "Kamchatka Standard Time": "Asia/Kamchatka",
    "Tonga Standard Time": "Pacific/Tongatapu",
    "Samoa Standard Time": "Pacific/Apia",
    "Line Islands Standard Time": "Pacific/Kiritimati",
}


def get_timezone() -> str:
    try:
        # 尝试获取系统的本地时区
        if 'TZ' in os.environ:
            return os.environ['TZ']

        # 如果环境变量中没有TZ，尝试获取系统时区
        if platform.system() == "Linux":
            # Linux:
            with open("/etc/timezone", "r") as f:
                return f.read().strip()
        elif platform.system() == "Darwin":
            # macOS:
            return ZoneInfo.from_file(open("/etc/localtime")).key
        elif platform.system() == "Windows":
            # Windows:
            import winreg
            with winreg.OpenKey(winreg.HKEY_LOCAL_MACHINE, r"SYSTEM\CurrentControlSet\Control\TimeZoneInformation") as key:
                tz = winreg.QueryValueEx(key, "TimeZoneKeyName")[0]
                return windows_timezone_map.get(tz) or tz
        else:
            return "UTC"
    except Exception as e:
        return "UTC"