// Prevents additional console window on Windows in release
#![cfg_attr(not(debug_assertions), windows_subsystem = "windows")]

fn main() {
    #[cfg(windows)]
    if !webview2_check::is_webview2_installed() {
        webview2_check::show_missing_dialog();
        return;
    }

    core_cooldown_lib::run()
}

#[cfg(windows)]
mod webview2_check {
    use std::ptr;
    use winapi::um::winuser::{MessageBoxW, MB_OK, MB_ICONWARNING};
    use winapi::um::shellapi::ShellExecuteW;

    // Statically linked from WebView2LoaderStatic.lib via msvc_compat shims
    extern "system" {
        fn GetAvailableCoreWebView2BrowserVersionString(
            browser_executable_folder: *const u16,
            version_info: *mut *mut u16,
        ) -> i32;
    }

    extern "system" {
        fn CoTaskMemFree(pv: *mut std::ffi::c_void);
    }

    fn to_wide(s: &str) -> Vec<u16> {
        s.encode_utf16().chain(std::iter::once(0)).collect()
    }

    pub fn is_webview2_installed() -> bool {
        unsafe {
            let mut version_info: *mut u16 = ptr::null_mut();
            let hr = GetAvailableCoreWebView2BrowserVersionString(
                ptr::null(),
                &mut version_info,
            );
            let installed = hr == 0 && !version_info.is_null();
            if !version_info.is_null() {
                CoTaskMemFree(version_info as *mut _);
            }
            installed
        }
    }

    pub fn show_missing_dialog() {
        let title = to_wide("Core Cooldown - WebView2 Required");
        let message = to_wide(
            "Microsoft WebView2 Runtime is required to run Core Cooldown, \
             but it was not found on this system.\n\n\
             Click OK to open the download page in your browser.\n\n\
             After installing WebView2, restart Core Cooldown."
        );
        let url = to_wide("https://developer.microsoft.com/en-us/microsoft-edge/webview2/consumer");
        let open = to_wide("open");

        unsafe {
            MessageBoxW(ptr::null_mut(), message.as_ptr(), title.as_ptr(), MB_OK | MB_ICONWARNING);
            ShellExecuteW(ptr::null_mut(), open.as_ptr(), url.as_ptr(), ptr::null(), ptr::null(), 1);
        }
    }
}