app.py

from flask import Flask, render_template, request, jsonify
import numpy as np
from sklearn.linear_model import LogisticRegression
import cv2
import os
from werkzeug.utils import secure_filename

app = Flask(__name__)

# Configure upload folder
UPLOAD_FOLDER = 'uploads'
os.makedirs(UPLOAD_FOLDER, exist_ok=True)
app.config['UPLOAD_FOLDER'] = UPLOAD_FOLDER
ALLOWED_EXTENSIONS = {'mp4', 'avi', 'mov'}

# Dummy ML model for LBW decision
def train_dummy_model():
    X = np.array([
        [0.5, 0.0, 0.4, 0.5, 30, 0],  # Not Out
        [0.5, 0.5, 0.5, 0.5, 35, 2],  # Out
        [0.6, 0.2, 0.5, 0.6, 32, 1],  # Not Out
        [0.5, 0.4, 0.5, 0.4, 34, 0],  # Out
    ])
    y = np.array([0, 1, 0, 1])
    model = LogisticRegression()
    model.fit(X, y)
    return model

model = train_dummy_model()

# Check allowed file extensions
def allowed_file(filename):
    return '.' in filename and filename.rsplit('.', 1)[1].lower() in ALLOWED_EXTENSIONS

# Process video to extract ball trajectory
def process_video(video_path):
    cap = cv2.VideoCapture(video_path)
    if not cap.isOpened():
        return None, None, "Failed to open video"

    # Lists to store trajectory points
    actual_path = []
    frame_count = 0
    total_speed = 0
    spin = 0  # Simplified: Assume no spin for now

    while cap.isOpened():
        ret, frame = cap.read()
        if not ret:
            break

        # Convert to HSV and detect ball (assuming a red ball)
        hsv = cv2.cvtColor(frame, cv2.COLOR_BGR2HSV)
        mask = cv2.inRange(hsv, (0, 120, 70), (10, 255, 255))
        contours, _ = cv2.findContours(mask, cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE)

        if contours:
            c = max(contours, key=cv2.contourArea)
            x, y, w, h = cv2.boundingRect(c)
            center_x = x + w / 2
            center_y = y + h / 2

            # Normalize coordinates to 0-1 (assuming 1280x720 video resolution)
            norm_x = center_x / 1280
            norm_y = center_y / 720
            actual_path.append({"x": norm_x, "y": norm_y})

        frame_count += 1
        if frame_count > 30:  # Process first 30 frames for simplicity
            break

    cap.release()

    if not actual_path:
        return None, None, "No ball detected in video"

    # Assume last point is impact, calculate pitching as midpoint
    pitching_x = actual_path[len(actual_path)//2]["x"]
    pitching_y = actual_path[len(actual_path)//2]["y"]
    impact_x = actual_path[-1]["x"]
    impact_y = actual_path[-1]["y"]

    # Simulate speed (frames per second to m/s, rough estimate)
    fps = cap.get(cv2.CAP_PROP_FPS) or 30
    speed = (len(actual_path) / (frame_count / fps)) * 0.5  # Simplified conversion

    # Projected path (linear from impact to stumps, adjusted for spin)
    projected_path = [
        {"x": impact_x, "y": impact_y},
        {"x": impact_x + spin * 0.1, "y": 1.0}  # Stumps at y=1.0
    ]

    return actual_path, projected_path, pitching_x, pitching_y, impact_x, impact_y, speed, spin

@app.route('/')
def index():
    return render_template('index.html')

@app.route('/analyze', methods=['POST'])
def analyze():
    if 'video' not in request.files:
        return jsonify({'error': 'No video uploaded'}), 400

    file = request.files['video']
    if file.filename == '' or not allowed_file(file.filename):
        return jsonify({'error': 'Invalid file'}), 400

    # Save the uploaded video
    filename = secure_filename(file.filename)
    video_path = os.path.join(app.config['UPLOAD_FOLDER'], filename)
    file.save(video_path)

    # Process video
    actual_path, projected_path, pitching_x, pitching_y, impact_x, impact_y, speed, spin = process_video(video_path)
    if actual_path is None:
        return jsonify({'error': projected_path}), 400  # projected_path holds error message here

    # Predict LBW decision
    features = np.array([[pitching_x, pitching_y, impact_x, impact_y, speed, spin]])
    prediction = model.predict(features)[0]
    confidence = model.predict_proba(features)[0][prediction]
    decision = "Out" if prediction == 1 else "Not Out"

    # Clean up
    os.remove(video_path)

    return jsonify({
        'actual_path': actual_path,
        'projected_path': projected_path,
        'decision': decision,
        'confidence': round(confidence, 2),
        'pitching': {'x': pitching_x, 'y': pitching_y},
        'impact': {'x': impact_x, 'y': impact_y}
    })

if __name__ == '__main__':
    app.run(host='0.0.0.0', port=7860, debug=True)