Improve the logic of env setup; add change wallpaper; add example

desktop_env/server/main.py

@@ -84,6 +84,36 @@ def get_cursor_position():
     return pyautogui.position().x, pyautogui.position().y
 
 
+@app.route("/setup/change_wallpaper", methods=['POST'])
+def change_wallpaper():
+    data = request.json
+    path = data.get('path', None)
+
+    if not path:
+        return "Path not supplied!", 400
+
+    path = Path(path)
+
+    if not path.exists():
+        return f"File not found: {path}", 404
+
+    try:
+        user_platform = platform.system()
+        if user_platform == "Windows":
+            import ctypes
+            ctypes.windll.user32.SystemParametersInfoW(20, 0, str(path), 3)
+        elif user_platform == "Linux":
+            import subprocess
+            subprocess.run(["gsettings", "set", "org.gnome.desktop.background", "picture-uri", f"file://{path}"])
+        elif user_platform == "Darwin":  # (Mac OS)
+            import subprocess
+            subprocess.run(
+                ["osascript", "-e", f'tell application "Finder" to set desktop picture to POSIX file "{path}"'])
+        return "Wallpaper changed successfully"
+    except Exception as e:
+        return f"Failed to change wallpaper. Error: {e}", 500
+
+
 @app.route("/setup/download_file", methods=['POST'])
 def download_file():
     data = request.json