#!/usr/bin/python
#-*- coding: utf-8 -*-

# Example usage:
#   python batch_syncnet_mp.py --video_dir /share/zhaohu_workspace/video_gen-hunyuanvideo1.5_tai2v_training/outputs/test_results_step_010400 --output_file results_10400.json --num_workers 4
#   python batch_syncnet_mp.py --video_dir /path/to/videos --num_workers 8 --video_ext mp4,avi

import argparse
import os
import glob
import json
from multiprocessing import Pool, current_process
import torch

# ==================== LOAD PARAMS ====================

parser = argparse.ArgumentParser(description="SyncNet Batch Processing with Multiprocessing")

parser.add_argument('--initial_model', type=str, default="data/syncnet_v2.model", help='Path to SyncNet model')
parser.add_argument('--batch_size', type=int, default=20, help='Batch size for processing')
parser.add_argument('--vshift', type=int, default=15, help='Video shift for evaluation')
parser.add_argument('--video_dir', type=str, required=True, help='Directory containing video files')
parser.add_argument('--tmp_dir', type=str, default="data/work/pytmp", help='Temporary directory')
parser.add_argument('--output_file', type=str, default="syncnet_scores.json", help='Output JSON file for results')
parser.add_argument('--video_ext', type=str, default="mp4,avi,mov,mkv", help='Video extensions to process (comma-separated)')
parser.add_argument('--num_workers', type=int, default=4, help='Number of parallel workers')

args = parser.parse_args()


def process_single_video(task):
    """Process a single video file and return the result."""
    idx, total, videofile, model_path, batch_size, vshift, tmp_dir = task
    video_name = os.path.basename(videofile)

    # Import here to avoid issues with multiprocessing
    from SyncNetInstance import SyncNetInstance

    # Create a unique reference for this process
    process_id = current_process().name
    reference = f"{os.path.splitext(video_name)[0]}_{process_id}"

    # Create opt-like object
    class Opt:
        pass
    opt = Opt()
    opt.batch_size = batch_size
    opt.vshift = vshift
    opt.tmp_dir = tmp_dir
    opt.reference = reference

    print(f"[{idx+1}/{total}] [{process_id}] Processing: {video_name}")

    try:
        # Load model for this process
        s = SyncNetInstance()
        s.loadParameters(model_path)

        offset, conf, dists = s.evaluate(opt, videofile=videofile)

        result = {
            'offset': int(offset),
            'confidence': float(conf),
            'min_dist': float(dists.min()) if dists is not None else None,
            'status': 'success'
        }
        print(f"  [{process_id}] {video_name} -> Offset: {offset}, Confidence: {conf:.3f}")

    except Exception as e:
        result = {
            'offset': None,
            'confidence': None,
            'min_dist': None,
            'status': 'error',
            'error_message': str(e)
        }
        print(f"  [{process_id}] {video_name} -> Error: {str(e)}")

    return video_name, result


def main():
    # ==================== FIND VIDEO FILES ====================

    video_extensions = args.video_ext.split(',')
    video_files = []
    for ext in video_extensions:
        video_files.extend(glob.glob(os.path.join(args.video_dir, f'*.{ext.strip()}')))
        video_files.extend(glob.glob(os.path.join(args.video_dir, f'*.{ext.strip().upper()}')))

    video_files = sorted(list(set(video_files)))
    total = len(video_files)
    print(f"Found {total} video files to process with {args.num_workers} workers.")

    if total == 0:
        print("No video files found. Exiting.")
        return

    # ==================== PREPARE TASKS ====================

    tasks = [
        (idx, total, vf, args.initial_model, args.batch_size, args.vshift, args.tmp_dir)
        for idx, vf in enumerate(video_files)
    ]

    # ==================== PROCESS WITH MULTIPROCESSING ====================

    # Use spawn method for CUDA compatibility
    torch.multiprocessing.set_start_method('spawn', force=True)

    with Pool(processes=args.num_workers) as pool:
        results_list = pool.map(process_single_video, tasks)

    # ==================== COLLECT RESULTS ====================

    results = {video_name: result for video_name, result in results_list}

    # ==================== SAVE RESULTS ====================

    with open(args.output_file, 'w') as f:
        json.dump(results, f, indent=2)

    print(f"\nResults saved to {args.output_file}")

    # Print summary
    successful = sum(1 for r in results.values() if r['status'] == 'success')
    print(f"Processed {successful}/{total} videos successfully.")


if __name__ == '__main__':
    main()