#!/usr/bin/env python3
"""
RTSP stream with YOLOv8 ball detection using GStreamer pipeline.
"""

import cv2
import time
import sys
from ultralytics import YOLO

BALL_CLASS_ID = 32  # sports ball
WIDTH = 1280
HEIGHT = 720
FPS = 25
PORT = 8554


def main():
    source = sys.argv[1] if len(sys.argv) > 1 else "/opt/nvidia/deepstream/deepstream/samples/streams/sample_1080p_h264.mp4"

    print("Loading YOLOv8n model...")
    model = YOLO("yolov8n.pt")
    try:
        model.to("cuda")
        print("Using CUDA")
    except:
        print("Using CPU")

    print(f"Opening: {source}")
    cap = cv2.VideoCapture(source)
    if not cap.isOpened():
        print("ERROR: Cannot open source")
        return 1

    # GStreamer RTSP output pipeline
    gst_out = (
        f"appsrc ! "
        f"video/x-raw,format=BGR,width={WIDTH},height={HEIGHT},framerate={FPS}/1 ! "
        f"queue ! videoconvert ! video/x-raw,format=I420 ! "
        f"x264enc tune=zerolatency bitrate=2000 speed-preset=ultrafast key-int-max=30 ! "
        f"video/x-h264,profile=baseline ! "
        f"rtspclientsink location=rtsp://127.0.0.1:{PORT}/live"
    )

    # Try simple UDP multicast instead
    gst_out_udp = (
        f"appsrc ! "
        f"video/x-raw,format=BGR,width={WIDTH},height={HEIGHT},framerate={FPS}/1 ! "
        f"videoconvert ! video/x-raw,format=I420 ! "
        f"x264enc tune=zerolatency bitrate=2000 speed-preset=ultrafast ! "
        f"h264parse ! "
        f"mpegtsmux ! "
        f"udpsink host=224.1.1.1 port=5000 auto-multicast=true"
    )

    # Or just write to file for testing
    gst_file = (
        f"appsrc ! "
        f"video/x-raw,format=BGR,width={WIDTH},height={HEIGHT},framerate={FPS}/1 ! "
        f"videoconvert ! video/x-raw,format=I420 ! "
        f"x264enc tune=zerolatency ! "
        f"mp4mux ! "
        f"filesink location=/tmp/output_detection.mp4"
    )

    print(f"\nStarting detection stream...")
    print(f"Output: /tmp/output_detection.mp4")
    print("Press Ctrl+C to stop\n")

    out = cv2.VideoWriter(gst_file, cv2.CAP_GSTREAMER, 0, FPS, (WIDTH, HEIGHT), True)

    if not out.isOpened():
        print("GStreamer writer failed, using regular file output")
        out = cv2.VideoWriter('/tmp/output_detection.mp4',
                             cv2.VideoWriter_fourcc(*'mp4v'), FPS, (WIDTH, HEIGHT))

    frame_count = 0
    start = time.time()
    total_detections = 0

    try:
        while True:
            ret, frame = cap.read()
            if not ret:
                cap.set(cv2.CAP_PROP_POS_FRAMES, 0)
                continue

            frame = cv2.resize(frame, (WIDTH, HEIGHT))

            # Detection
            results = model(frame, verbose=False, classes=[BALL_CLASS_ID], conf=0.25)
            for r in results:
                for box in r.boxes:
                    x1, y1, x2, y2 = map(int, box.xyxy[0])
                    conf = float(box.conf[0])
                    cv2.rectangle(frame, (x1, y1), (x2, y2), (0, 255, 0), 3)
                    cv2.putText(frame, f"Ball {conf:.2f}", (x1, y1-10),
                               cv2.FONT_HERSHEY_SIMPLEX, 0.7, (0, 255, 0), 2)
                    total_detections += 1

            # FPS overlay
            frame_count += 1
            elapsed = time.time() - start
            fps = frame_count / elapsed
            cv2.putText(frame, f"FPS: {fps:.1f}", (10, 30),
                       cv2.FONT_HERSHEY_SIMPLEX, 1, (0, 255, 255), 2)

            out.write(frame)

            if frame_count % 50 == 0:
                print(f"Frame {frame_count}, FPS: {fps:.1f}, Detections: {total_detections}")

            # Stop after 10 seconds for test
            if elapsed > 10:
                print("\n10 second test complete")
                break

    except KeyboardInterrupt:
        print("\nStopping...")
    finally:
        elapsed = time.time() - start
        print(f"\nProcessed {frame_count} frames in {elapsed:.1f}s")
        print(f"Average FPS: {frame_count/elapsed:.1f}")
        print(f"Total detections: {total_detections}")
        print(f"Output saved to: /tmp/output_detection.mp4")
        cap.release()
        out.release()

    return 0


if __name__ == "__main__":
    sys.exit(main())