"""
Profiling script for the real-time object tracking pipeline.

This script runs the single-stream example from test_tracking_realtime.py
under the Python profiler (cProfile) to identify performance bottlenecks.

Usage:
    python scripts/profiling.py

The script will print a summary of the most time-consuming functions
at the end of the run.
"""

import asyncio
import cProfile
import pstats
import io
import time
import os
import torch
import cv2
from dotenv import load_dotenv

# Add project root to path to allow imports from services
import sys
sys.path.append(os.path.abspath(os.path.join(os.path.dirname(__file__), '..')))

from services import (
    StreamConnectionManager,
    YOLOv8Utils,
)

# Load environment variables
load_dotenv()


async def profiled_main():
    """
    Single stream example with event-driven architecture, adapted for profiling.
    This function is a modified version of main_single_stream from test_tracking_realtime.py
    """
    print("=" * 80)
    print("Profiling: Event-Driven GPU-Accelerated Object Tracking")
    print("=" * 80)

    # Configuration
    GPU_ID = 0
    MODEL_PATH = "bangchak/models/frontal_detection_v5.pt"
    STREAM_URL = os.getenv('CAMERA_URL_1', 'rtsp://localhost:8554/test')
    BATCH_SIZE = 4
    FORCE_TIMEOUT = 0.05
    # NOTE: Display is disabled for profiling to isolate pipeline performance
    ENABLE_DISPLAY = False
    # Run for a limited number of frames to get a representative profile
    MAX_FRAMES = int(os.getenv('MAX_FRAMES', '300'))

    print(f"\nConfiguration:")
    print(f"  GPU: {GPU_ID}")
    print(f"  Model: {MODEL_PATH}")
    print(f"  Stream: {STREAM_URL}")
    print(f"  Batch size: {BATCH_SIZE}")
    print(f"  Force timeout: {FORCE_TIMEOUT}s")
    print(f"  Display: Disabled for profiling")
    print(f"  Max frames: {MAX_FRAMES}\n")

    # Create StreamConnectionManager
    print("[1/3] Creating StreamConnectionManager...")
    manager = StreamConnectionManager(
        gpu_id=GPU_ID,
        batch_size=BATCH_SIZE,
        force_timeout=FORCE_TIMEOUT,
        enable_pt_conversion=True
    )
    print("✓ Manager created")

    # Initialize with PT model
    print("\n[2/3] Initializing with PT model...")
    try:
        await manager.initialize(
            model_path=MODEL_PATH,
            model_id="detector",
            preprocess_fn=YOLOv8Utils.preprocess,
            postprocess_fn=YOLOv8Utils.postprocess,
            num_contexts=4,
            pt_input_shapes={"images": (1, 3, 640, 640)},
            pt_precision=torch.float16
        )
        print("✓ Manager initialized")
    except Exception as e:
        print(f"✗ Failed to initialize: {e}")
        return

    # Connect stream
    print("\n[3/3] Connecting to stream...")
    try:
        connection = await manager.connect_stream(
            rtsp_url=STREAM_URL,
            stream_id="camera_1",
            buffer_size=30
        )
        print(f"✓ Stream connected: camera_1")
    except Exception as e:
        print(f"✗ Failed to connect stream: {e}")
        await manager.shutdown()
        return

    print(f"\n{'=' * 80}")
    print(f"Profiling is running for {MAX_FRAMES} frames...")
    print(f"{ '=' * 80}\n")

    result_count = 0
    start_time = time.time()

    try:
        async for result in connection.tracking_results():
            result_count += 1
            if result_count >= MAX_FRAMES:
                print(f"\n✓ Reached max frames limit ({MAX_FRAMES})")
                break

            if result_count % 50 == 0:
                print(f"  Processed {result_count}/{MAX_FRAMES} frames...")

    except KeyboardInterrupt:
        print(f"\n✓ Interrupted by user")

    # Cleanup
    print(f"\n{'=' * 80}")
    print("Cleanup")
    print(f"{ '=' * 80}")

    await connection.stop()
    await manager.shutdown()
    print("✓ Stopped")

    # Final stats
    elapsed = time.time() - start_time
    avg_fps = result_count / elapsed if elapsed > 0 else 0
    print(f"\nFinal: {result_count} results in {elapsed:.1f}s ({avg_fps:.1f} FPS)")


if __name__ == "__main__":
    # Create a profiler object
    profiler = cProfile.Profile()

    # Run the async main function under the profiler
    print("Starting profiler...")
    profiler.enable()

    asyncio.run(profiled_main())

    profiler.disable()
    print("Profiling complete.")

    # Print the stats
    s = io.StringIO()
    # Sort stats by cumulative time
    sortby = pstats.SortKey.CUMULATIVE
    ps = pstats.Stats(profiler, stream=s).sort_stats(sortby)
    ps.print_stats(30)  # Print top 30 functions

    print("\n" + "="*80)
    print("PROFILING RESULTS (Top 30, sorted by cumulative time)")
    print("="*80)
    print(s.getvalue())