"""Launch native desktop notifications without blocking Tk."""

import base64
import json
import os
import subprocess
import sys

from copienator.platform import find_executable


def notify_desktop(title: str, message: str) -> None:
    if sys.platform.startswith("linux"):
        executable = find_executable("notify-send")
        if not executable:
            raise RuntimeError("Installez notify-send (libnotify) pour les notifications de bureau.")
        command = [executable, "--app-name=Copienator", "--", title, message]
    elif sys.platform == "darwin":
        command = ["/usr/bin/osascript", "-e",
                   f"display notification {json.dumps(message, ensure_ascii=False)} with title {json.dumps(title, ensure_ascii=False)}"]
    elif os.name == "nt":
        # Encode the script and quote strings as literals; no shell interpolation.
        quote = lambda value: "'" + value.replace("'", "''") + "'"
        script = (
            "Add-Type -AssemblyName System.Windows.Forms;"
            "$notice = New-Object System.Windows.Forms.NotifyIcon;"
            "$notice.Icon = [System.Drawing.SystemIcons]::Information;"
            "$notice.Visible = $true;"
            f"$notice.ShowBalloonTip(10000, {quote(title)}, {quote(message)}, "
            "[System.Windows.Forms.ToolTipIcon]::Info);"
            "Start-Sleep -Seconds 12; $notice.Dispose()"
        )
        command = ["powershell.exe", "-NoProfile", "-NonInteractive", "-WindowStyle", "Hidden",
                   "-EncodedCommand", base64.b64encode(script.encode("utf-16-le")).decode("ascii")]
    else:
        raise RuntimeError("Notifications de bureau indisponibles sur ce système.")
    subprocess.Popen(command, stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)