import logging

import cv2
import mediapipe as mp


def main() -> None:
    """Main function."""
    mp_drawing = mp.solutions.drawing_utils  # type: ignore
    mp_drawing_styles = mp.solutions.drawing_styles  # type: ignore
    mp_face_mesh = mp.solutions.face_mesh  # type: ignore

    # open webcam
    cap = cv2.VideoCapture(0)

    with mp_face_mesh.FaceMesh(
        max_num_faces=2, refine_landmarks=True, min_detection_confidence=0.5, min_tracking_confidence=0.5
    ) as face_mesh:

        while cap.isOpened():

            # read webcam
            success, image = cap.read()
            if not success:
                print("Ignoring empty camera frame.")
                # If loading a video, use 'break' instead of 'continue'
                continue

            # to improve performance, optionally mark the image as not writeable to pass by reference.
            image.flags.writeable = False
            image = cv2.cvtColor(image, cv2.COLOR_BGR2RGB)
            results = face_mesh.process(image)

            # draw the face mesh annotations on the image.
            image.flags.writeable = True
            image = cv2.cvtColor(image, cv2.COLOR_RGB2BGR)
            if results.multi_face_landmarks:
                for face_landmarks in results.multi_face_landmarks:
                    mp_drawing.draw_landmarks(
                        image=image,
                        landmark_list=face_landmarks,
                        connections=mp_face_mesh.FACEMESH_TESSELATION,
                        landmark_drawing_spec=None,
                        connection_drawing_spec=mp_drawing_styles.get_default_face_mesh_tesselation_style(),
                    )
                    mp_drawing.draw_landmarks(
                        image=image,
                        landmark_list=face_landmarks,
                        connections=mp_face_mesh.FACEMESH_CONTOURS,
                        landmark_drawing_spec=None,
                        connection_drawing_spec=mp_drawing_styles.get_default_face_mesh_contours_style(),
                    )
                    mp_drawing.draw_landmarks(
                        image=image,
                        landmark_list=face_landmarks,
                        connections=mp_face_mesh.FACEMESH_IRISES,
                        landmark_drawing_spec=None,
                        connection_drawing_spec=mp_drawing_styles.get_default_face_mesh_iris_connections_style(),
                    )

            # flip the image horizontally for a selfie-view display.
            cv2.imshow("MediaPipe Face Mesh", cv2.flip(image, 1))
            if cv2.waitKey(5) & 0xFF == 27:
                break

    # close webcam
    cap.release()


if __name__ == "__main__":
    # setup logging format
    logging.basicConfig(
        level=logging.INFO,
        format="%(asctime)s %(name)s %(levelname)-8s  %(message)s",
        datefmt="(%F %T)",
    )

    main()