saved preview picture

utils.py

@@ -166,3 +166,46 @@ def fetch_positions_for_selected_day(settings, device_mapping, device_name, star
     if error:
         return [], error
     return positions, None
+
+def html_to_image(html_path, img_path, width=800, height=600, delay=2, driver_path='/usr/bin/chromedriver'):
+    """
+    Convert an HTML file to an image using Selenium and Pillow.
+    Args:
+        html_path (str): Path to the HTML file.
+        img_path (str): Path to save the output image (PNG).
+        width (int): Width of the browser window.
+        height (int): Height of the browser window.
+        delay (int): Seconds to wait for the page to render.
+        driver_path (str): Path to chromedriver binary.
+    """
+    from selenium import webdriver
+    from selenium.webdriver.chrome.service import Service
+    from selenium.webdriver.chrome.options import Options
+    from PIL import Image
+    import time
+    import os
+
+    chrome_options = Options()
+    chrome_options.add_argument("--headless")
+    chrome_options.add_argument(f"--window-size={width},{height}")
+    chrome_options.add_argument("--no-sandbox")
+    chrome_options.add_argument("--disable-dev-shm-usage")
+
+    service = Service(driver_path)
+    driver = webdriver.Chrome(service=service, options=chrome_options)
+
+    try:
+        driver.get("file://" + os.path.abspath(html_path))
+        time.sleep(delay)  # Wait for the page to render
+        tmp_img = img_path + ".tmp.png"
+        driver.save_screenshot(tmp_img)
+        driver.quit()
+
+        img = Image.open(tmp_img)
+        img = img.crop((0, 0, width, height))
+        img.save(img_path)
+        os.remove(tmp_img)
+        print(f"Image saved to: {img_path}")
+    except Exception as e:
+        print(f"Error converting HTML to image: {e}")
+        driver.quit()