app.py

import gradio as gr
import tempfile
from pathlib import Path
import numpy as np
import cv2
from utils.video_utils import extract_frames_from_video, save_frames_to_video
from detection.detector import Detector
from tracking.ball_tracker import BasicBallTracker
from trajectory.fit_trajectory import TrajectoryFitter
from rules.lbw_engine import LBWEngine
from visualization.overlay_generator import OverlayGenerator

# Initialize components
detector = Detector()
tracker = BasicBallTracker()
traj_fitter = TrajectoryFitter()
umpire = LBWEngine()
visual = OverlayGenerator(config=None)

def review_video(video_file):
    tmp_path = Path(video_file)  # video_file is already a path string
    if not tmp_path.is_file():
        return "Video file not found", None

    try:
        frames = extract_frames_from_video(str(tmp_path))
    except Exception as e:
        return f"Error extracting frames: {str(e)}", None

    # Ball detection and tracking
    for idx, frm in enumerate(frames):
        dets = detector.infer(frm)
        tracker.update(dets, idx)

    track_pts = [(int(x), int(y)) for _, x, y in tracker.get_track()]
    if len(track_pts) < 5:
        return "Insufficient ball points detected", None

    # Fit trajectory and project the ball path dynamically
    traj_fitter.fit(track_pts)
    xs = np.linspace(track_pts[0][0], track_pts[-1][0], 100)
    ys = traj_fitter.project(xs)

    if len(xs) < 2 or len(ys) < 2:
        return "Trajectory fitting failed", None

    curve_pts = list(zip(xs.astype(int), ys.astype(int)))

    # Dynamic pitch zone calculation (based on first detected point)
    pitch_zone = determine_pitch_zone(track_pts[0])

    # Dynamic impact zone calculation (based on trajectory and impact)
    impact_zone = determine_impact_zone(track_pts)

    # Check if the ball hits the stumps
    hits_stumps = check_stumps_impact(curve_pts)

    # Decision logic: determine if it’s OUT or NOT OUT dynamically
    verdict, reason = umpire.decide({
        "pitch_zone": pitch_zone,
        "impact_zone": impact_zone,
        "hits_stumps": hits_stumps,
        "shot_offered": False,  # This can be improved with player pose detection
    })

    # Annotate the frames with the trajectory and decision dynamically
    annotated_frames = []
    for frm in frames:
        annotated_frame = visual.draw(frm.copy(), curve_pts, verdict)
        annotated_frames.append(annotated_frame)

    # Save the annotated video to a temporary file
    out_file = tempfile.NamedTemporaryFile(suffix="_drs.mp4", delete=False)
    save_frames_to_video(annotated_frames, out_file.name)
    out_file.close()  # Ensure the temporary file is closed and accessible

    return verdict + ": " + reason, out_file.name

# Helper Functions
def determine_pitch_zone(first_point):
    """
    Determine if the ball is in-line with the stumps or outside off/leg.
    Dynamic based on the ball's first detected position.
    """
    x, y = first_point  # first_point is (x, y)
    # Example logic: check if the ball is in-line or outside
    if x < 300:  # In-line with stumps (This is just an example threshold)
        return "inline"
    elif 300 <= x <= 500:  # Outside off stump
        return "outside_off"
    else:
        return "outside_leg"

def determine_impact_zone(track_points):
    """
    Determine the impact zone: in-line or outside leg.
    Based on the trajectory of the ball and its impact.
    """
    # Check if the ball impacts the batsman's leg (dynamic)
    impact_point = track_points[-1]  # Last point could be an approximation of impact
    x, y = impact_point
    if 200 <= x <= 400:  # Assuming this range as an in-line range for example
        return "in_line"
    else:
        return "outside_leg"

def check_stumps_impact(trajectory_points):
    """
    Predict if the ball would hit the stumps based on its trajectory.
    """
    last_point = trajectory_points[-1]
    # Example logic: Check if the final projected point is in-line with the stumps
    x, y = last_point
    if 200 <= x <= 400 and y <= 0:  # Ball hitting the stumps (example range)
        return True
    else:
        return False


# Gradio interface setup
gui = gr.Interface(
    fn=review_video,
    inputs=gr.Video(label="Upload LBW Appeal Video"),
    outputs=[gr.Textbox(label="Verdict"), gr.Video(label="Annotated Output")],
    title="LBW DRS AI Review",
    description="Proof‑of‑concept: detects ball, projects trajectory, and renders decision.",
)

if __name__ == "__main__":
    gui.launch()