Initial commit: POE2 automated trade bot

Monitors pathofexile.com/trade2 for new listings, travels to seller
hideouts, buys items from public stash tabs, and stores them.

Includes persistent C# OCR daemon for fast screen capture + Windows
native OCR, web dashboard for managing trade links and settings,
and full game automation via Win32 SendInput.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/game/WindowManager.ts

@@ -0,0 +1,90 @@
+import koffi from 'koffi';
+import { logger } from '../util/logger.js';
+
+// Win32 types
+const HWND = 'int';
+const BOOL = 'bool';
+const RECT = koffi.struct('RECT', {
+  left: 'long',
+  top: 'long',
+  right: 'long',
+  bottom: 'long',
+});
+
+// Load user32.dll
+const user32 = koffi.load('user32.dll');
+
+const FindWindowW = user32.func('FindWindowW', HWND, ['str16', 'str16']);
+const SetForegroundWindow = user32.func('SetForegroundWindow', BOOL, [HWND]);
+const ShowWindow = user32.func('ShowWindow', BOOL, [HWND, 'int']);
+const BringWindowToTop = user32.func('BringWindowToTop', BOOL, [HWND]);
+const GetForegroundWindow = user32.func('GetForegroundWindow', HWND, []);
+const GetWindowRect = user32.func('GetWindowRect', BOOL, [HWND, koffi.out(koffi.pointer(RECT))]);
+const IsWindow = user32.func('IsWindow', BOOL, [HWND]);
+const keybd_event = user32.func('keybd_event', 'void', ['uint8', 'uint8', 'uint32', 'uint']);
+const MapVirtualKeyW = user32.func('MapVirtualKeyW', 'uint32', ['uint32', 'uint32']);
+
+// Constants
+const SW_RESTORE = 9;
+const VK_MENU = 0x12; // Alt key
+const KEYEVENTF_KEYUP = 0x0002;
+
+export class WindowManager {
+  private hwnd: number = 0;
+
+  constructor(private windowTitle: string) {}
+
+  findWindow(): number {
+    this.hwnd = FindWindowW(null as unknown as string, this.windowTitle);
+    if (this.hwnd === 0) {
+      logger.warn({ title: this.windowTitle }, 'Window not found');
+    } else {
+      logger.info({ title: this.windowTitle, hwnd: this.hwnd }, 'Window found');
+    }
+    return this.hwnd;
+  }
+
+  focusWindow(): boolean {
+    if (!this.hwnd || !IsWindow(this.hwnd)) {
+      this.findWindow();
+    }
+    if (!this.hwnd) return false;
+
+    // Restore if minimized
+    ShowWindow(this.hwnd, SW_RESTORE);
+
+    // Alt-key trick to bypass SetForegroundWindow restriction
+    const altScan = MapVirtualKeyW(VK_MENU, 0);
+    keybd_event(VK_MENU, altScan, 0, 0);
+    keybd_event(VK_MENU, altScan, KEYEVENTF_KEYUP, 0);
+
+    BringWindowToTop(this.hwnd);
+    const result = SetForegroundWindow(this.hwnd);
+
+    if (!result) {
+      logger.warn('SetForegroundWindow failed');
+    }
+    return result;
+  }
+
+  getWindowRect(): { left: number; top: number; right: number; bottom: number } | null {
+    if (!this.hwnd || !IsWindow(this.hwnd)) {
+      this.findWindow();
+    }
+    if (!this.hwnd) return null;
+
+    const rect = { left: 0, top: 0, right: 0, bottom: 0 };
+    const success = GetWindowRect(this.hwnd, rect);
+    if (!success) return null;
+    return rect;
+  }
+
+  isGameFocused(): boolean {
+    const fg = GetForegroundWindow();
+    return fg === this.hwnd && this.hwnd !== 0;
+  }
+
+  getHwnd(): number {
+    return this.hwnd;
+  }
+}