"""
Create a simple test video with lane-like features for testing
"""
import cv2
import numpy as np
import os

def create_test_video(output_path, duration_sec=5, fps=30):
    """
    Create a test video with simulated road and lanes
    """
    width, height = 640, 480
    fourcc = cv2.VideoWriter_fourcc(*'mp4v')
    out = cv2.VideoWriter(output_path, fourcc, fps, (width, height))
    
    total_frames = duration_sec * fps
    
    for frame_idx in range(total_frames):
        # Create dark gray background (asphalt)
        frame = np.ones((height, width, 3), dtype=np.uint8) * 50
        
        # Add some texture/noise for realism
        noise = np.random.randint(0, 20, (height, width, 3), dtype=np.uint8)
        frame = cv2.add(frame, noise)
        
        # Draw road perspective trapezoid
        road_points = np.array([
            [int(width * 0.1), height],
            [int(width * 0.4), int(height * 0.5)],
            [int(width * 0.6), int(height * 0.5)],
            [int(width * 0.9), height]
        ], dtype=np.int32)
        cv2.fillPoly(frame, [road_points], (60, 60, 60))
        
        # Calculate lane positions with slight animation
        offset = int(10 * np.sin(frame_idx / 10))
        
        # Left lane
        left_bottom = (int(width * 0.3) + offset, height)
        left_top = (int(width * 0.45) + offset, int(height * 0.6))
        cv2.line(frame, left_bottom, left_top, (255, 255, 255), 3)
        
        # Right lane
        right_bottom = (int(width * 0.7) + offset, height)
        right_top = (int(width * 0.55) + offset, int(height * 0.6))
        cv2.line(frame, right_bottom, right_top, (255, 255, 255), 3)
        
        # Add dashed center line
        for y in range(height, int(height * 0.6), -30):
            if (y // 30) % 2 == 0:
                x_start = int(width * 0.5) + offset
                x_end = int(width * 0.5) + offset
                cv2.line(frame, (x_start, y), (x_end, y - 20), (255, 255, 0), 2)
        
        # Write frame
        out.write(frame)
    
    out.release()
    print(f"✓ Test video created: {output_path}")
    print(f"  Duration: {duration_sec}s, FPS: {fps}, Frames: {total_frames}")


if __name__ == "__main__":
    # Create test video in /tmp
    output_path = "/tmp/test_road_video.mp4"
    create_test_video(output_path, duration_sec=3, fps=30)