// SPDX-FileCopyrightText: © 2026 Jeffrey C. Ollie <jeff@ocjtech.us>
// SPDX-License-Identifier: MIT

//! Whether the user chose dark or light for programs, in Settings'
//! Personalization > Colors: what the portal reports as the color scheme
//! and the platform gives the frames Windows draws, so that the two agree.

const win32 = @import("win32").everything;

const L = @import("std").unicode.utf8ToUtf16LeStringLiteral;

/// True for dark; light when the user never chose, as Windows has it.
pub fn dark() bool {
    var light: u32 = 1;
    var size: u32 = @sizeOf(u32);
    const err = win32.RegGetValueW(
        win32.HKEY_CURRENT_USER,
        L("Software\\Microsoft\\Windows\\CurrentVersion\\Themes\\Personalize"),
        L("AppsUseLightTheme"),
        win32.RRF_RT_REG_DWORD,
        null,
        &light,
        &size,
    );
    return err == .NO_ERROR and light == 0;
}