// Locate the game's main window from inside the game process: the largest
// visible, unowned top-level window the pid owns. Shared by the focus spoof
// (subclass target) and the MKB forwarder (PostMessage target).
#pragma once

#include <windows.h>

namespace coop::hook
{

inline HWND find_main_window(DWORD pid)
{
	struct Ctx
	{
		DWORD pid;
		HWND best;
		long best_area;
	} ctx{pid, nullptr, 0};

	EnumWindows(
	    [](HWND hwnd, LPARAM lparam) -> BOOL {
		    auto* c = reinterpret_cast<Ctx*>(lparam);
		    DWORD pid = 0;
		    GetWindowThreadProcessId(hwnd, &pid);
		    if (pid != c->pid || !IsWindowVisible(hwnd) || GetWindow(hwnd, GW_OWNER) != nullptr)
		    {
			    return TRUE; // not ours, hidden, or an owned dialog -- keep looking
		    }
		    RECT rect = {};
		    if (!GetWindowRect(hwnd, &rect))
		    {
			    return TRUE;
		    }
		    const long area = (rect.right - rect.left) * (rect.bottom - rect.top);
		    if (area > c->best_area)
		    {
			    c->best_area = area;
			    c->best = hwnd;
		    }
		    return TRUE;
	    },
	    reinterpret_cast<LPARAM>(&ctx));
	return ctx.best;
}

} // namespace coop::hook