#!/usr/bin/env python3
"""
解析 H5 文件并导出为 Hugging Face Dataset Viewer 兼容格式

用法:
  python extract_h5.py          # 解析所有 H5 文件
  python extract_h5.py --check  # 仅检查 H5 文件结构（不解析）
"""

import argparse
import h5py
import numpy as np
from pathlib import Path
from PIL import Image
from tqdm import tqdm
import json
from collections import defaultdict


def check_h5_structure(base_dir):
    """检查所有 H5 文件的字段结构"""
    folder_keys = defaultdict(lambda: defaultdict(set))
    
    h5_folders = [d for d in base_dir.iterdir() if d.is_dir() and d.name.endswith('_h5')]
    
    for h5_folder in sorted(h5_folders):
        h5_files = list(h5_folder.rglob('*.h5'))
        print(f"\n{'='*60}")
        print(f"文件夹: {h5_folder.name} ({len(h5_files)} 个文件)")
        print('='*60)
        
        # 检查前 3 个文件作为示例
        for h5_path in h5_files[:3]:
            print(f"\n  {h5_path.name}:")
            with h5py.File(h5_path, 'r') as f:
                for key in sorted(f.keys()):
                    arr = f[key]
                    print(f"    - {key}: shape={arr.shape}, dtype={arr.dtype}")
                    folder_keys[h5_folder.name][key].add(str(arr.shape))
        
        # 汇总该文件夹的所有键
        print(f"\n  汇总 (检查全部 {len(h5_files)} 个文件):")
        for h5_path in h5_files:
            with h5py.File(h5_path, 'r') as f:
                for key in f.keys():
                    folder_keys[h5_folder.name][key].add(str(f[key].shape))
        
        for key, shapes in sorted(folder_keys[h5_folder.name].items()):
            print(f"    - {key}: shapes={list(shapes)}")
    
    # 总汇总
    print(f"\n{'='*60}")
    print("总汇总 - 所有文件夹的字段:")
    print('='*60)
    for folder, keys in sorted(folder_keys.items()):
        print(f"\n{folder}:")
        for key, shapes in sorted(keys.items()):
            print(f"  - {key}: {list(shapes)}")


def extract_pose_data(h5_path, output_dir, episode_id, subset_path=""):
    """解析 pose_data 文件，按帧展开"""
    episode_dir = output_dir / episode_id
    episode_dir.mkdir(parents=True, exist_ok=True)
    
    rel_prefix = f"{subset_path}/{episode_id}" if subset_path else episode_id
    
    records = []
    
    with h5py.File(h5_path, 'r') as f:
        keys = list(f.keys())
        num_frames = len(f['timestamps'][:]) if 'timestamps' in keys else 0
        
        # 预处理所有数据
        data_cache = {}
        image_paths = {}
        
        for key in keys:
            arr = f[key][:]
            
            if arr.dtype == np.uint8:  # 图像数据
                if len(arr.shape) == 3:  # 单张背景图 (H, W, C)
                    filename = "bg.png"
                    Image.fromarray(arr).save(episode_dir / filename)
                    data_cache[f"{key}_image"] = f"{rel_prefix}/{filename}"
                    
                elif len(arr.shape) == 4:  # 图像序列 (N, H, W, C)
                    paths = []
                    for i, img in enumerate(arr):
                        filename = f"{key}_{i:04d}.png"
                        Image.fromarray(img).save(episode_dir / filename)
                        paths.append(f"{rel_prefix}/{filename}")
                    image_paths[key] = paths
                    
                elif len(arr.shape) == 5:  # 多视角 (N, V, H, W, C)
                    num_views = arr.shape[1]
                    paths = []
                    for frame_idx in range(arr.shape[0]):
                        frame_paths = []
                        for view_idx in range(num_views):
                            filename = f"{key}_f{frame_idx:04d}_v{view_idx}.png"
                            Image.fromarray(arr[frame_idx, view_idx]).save(episode_dir / filename)
                            frame_paths.append(f"{rel_prefix}/{filename}")
                        paths.append(frame_paths)
                    image_paths[key] = paths
                    data_cache[f"{key}_num_views"] = num_views
            else:
                data_cache[key] = arr.tolist()
        
        # 按帧展开
        for frame_idx in range(num_frames):
            record = {
                "episode_id": episode_id,
                "frame_idx": frame_idx,
            }
            
            if subset_path:
                record["subset"] = subset_path
            
            # 添加该帧的图像路径 (file_name 为 HF 格式必需)
            for key, paths in image_paths.items():
                if isinstance(paths[0], list):  # 多视角
                    for v_idx, p in enumerate(paths[frame_idx]):
                        if v_idx == 0:
                            record["file_name"] = p
                        record[f"image_v{v_idx}"] = p
                else:
                    record["file_name"] = paths[frame_idx]
                    record["image"] = paths[frame_idx]
            
            # 添加静态数据
            for key, val in data_cache.items():
                if key.endswith("_image") or key.endswith("_num_views"):
                    record[key] = val
            
            # 添加该帧的数值数据
            if 'timestamps' in data_cache:
                record["timestamp"] = data_cache['timestamps'][frame_idx]
            if 'rotations' in data_cache:
                record["rotation"] = data_cache['rotations'][frame_idx]
            if 'translations' in data_cache:
                record["translation"] = data_cache['translations'][frame_idx]
            if 'tactile' in data_cache:
                record["tactile"] = data_cache['tactile'][frame_idx]
            if 'xela' in data_cache:
                record["xela"] = data_cache['xela'][frame_idx]
            
            record["num_frames"] = num_frames
            records.append(record)
    
    return records


def extract_tacniq_gsmini(h5_path, output_dir, episode_id, subset_path=""):
    """解析 tacniq_gsmini 文件，按帧展开"""
    episode_dir = output_dir / episode_id
    episode_dir.mkdir(parents=True, exist_ok=True)
    
    rel_prefix = f"{subset_path}/{episode_id}" if subset_path else episode_id
    
    records = []
    
    with h5py.File(h5_path, 'r') as f:
        bg = f['bg'][:]
        gsmini = f['gsmini'][:]
        tacniq = f['tacniq'][:].tolist()
    
    Image.fromarray(bg).save(episode_dir / "bg.png")
    bg_path = f"{rel_prefix}/bg.png"
    
    num_frames = len(gsmini)
    
    for frame_idx in range(num_frames):
        filename = f"gsmini_{frame_idx:04d}.png"
        Image.fromarray(gsmini[frame_idx]).save(episode_dir / filename)
        
        record = {
            "episode_id": episode_id,
            "frame_idx": frame_idx,
            "file_name": f"{rel_prefix}/{filename}",
            "image": f"{rel_prefix}/{filename}",
            "bg_image": bg_path,
            "tacniq": tacniq[frame_idx] if frame_idx < len(tacniq) else None,
            "num_frames": num_frames,
        }
        
        if subset_path:
            record["subset"] = subset_path
        
        records.append(record)
    
    return records


def extract_xela_9dtact(h5_path, output_dir, episode_id, subset_path=""):
    """解析 xela_9dtact 文件，按帧展开"""
    episode_dir = output_dir / episode_id
    episode_dir.mkdir(parents=True, exist_ok=True)
    
    rel_prefix = f"{subset_path}/{episode_id}" if subset_path else episode_id
    
    records = []
    
    with h5py.File(h5_path, 'r') as f:
        bg = f['bg'][:]
        dtact = f['9dtact'][:]
        xela = f['xela'][:].tolist()
    
    Image.fromarray(bg).save(episode_dir / "bg.png")
    bg_path = f"{rel_prefix}/bg.png"
    
    num_frames = len(dtact)
    
    for frame_idx in range(num_frames):
        filename = f"9dtact_{frame_idx:04d}.png"
        Image.fromarray(dtact[frame_idx]).save(episode_dir / filename)
        
        record = {
            "episode_id": episode_id,
            "frame_idx": frame_idx,
            "file_name": f"{rel_prefix}/{filename}",
            "image": f"{rel_prefix}/{filename}",
            "bg_image": bg_path,
            "xela": xela[frame_idx] if frame_idx < len(xela) else None,
            "num_frames": num_frames,
        }
        
        if subset_path:
            record["subset"] = subset_path
        
        records.append(record)
    
    return records


def extract_force_data(h5_path, output_dir, episode_id, subset_path=""):
    """解析 force_data 文件，按帧展开"""
    episode_dir = output_dir / episode_id
    episode_dir.mkdir(parents=True, exist_ok=True)
    
    rel_prefix = f"{subset_path}/{episode_id}" if subset_path else episode_id
    
    records = []
    
    with h5py.File(h5_path, 'r') as f:
        keys = list(f.keys())
        
        num_frames = 0
        data_cache = {}
        image_paths = {}
        
        for key in keys:
            arr = f[key][:]
            
            if arr.dtype == np.uint8:
                if len(arr.shape) == 3:
                    filename = f"{key}.png"
                    Image.fromarray(arr).save(episode_dir / filename)
                    data_cache[f"{key}_image"] = f"{rel_prefix}/{filename}"
                elif len(arr.shape) == 4:
                    num_frames = max(num_frames, len(arr))
                    paths = []
                    for i, img in enumerate(arr):
                        filename = f"{key}_{i:04d}.png"
                        Image.fromarray(img).save(episode_dir / filename)
                        paths.append(f"{rel_prefix}/{filename}")
                    image_paths[key] = paths
            else:
                data_cache[key] = arr.tolist()
                if len(arr.shape) >= 1:
                    num_frames = max(num_frames, len(arr))
        
        for frame_idx in range(num_frames):
            record = {
                "episode_id": episode_id,
                "frame_idx": frame_idx,
                "num_frames": num_frames,
            }
            
            if subset_path:
                record["subset"] = subset_path
            
            for key, paths in image_paths.items():
                if frame_idx < len(paths):
                    record["file_name"] = paths[frame_idx]
                    record["image"] = paths[frame_idx]
            
            for key, val in data_cache.items():
                if key.endswith("_image"):
                    record[key] = val
                elif isinstance(val, list) and frame_idx < len(val):
                    record[key] = val[frame_idx]
            
            records.append(record)
    
    return records


def extract_all(base_dir):
    """解析所有 H5 文件"""
    h5_folders = [d for d in base_dir.iterdir() if d.is_dir() and d.name.endswith('_h5')]
    
    for h5_folder in h5_folders:
        output_folder = base_dir / h5_folder.name.replace('_h5', '')
        output_folder.mkdir(exist_ok=True)
        
        h5_files = list(h5_folder.rglob('*.h5'))
        print(f"\n处理 {h5_folder.name}: {len(h5_files)} 个文件 -> {output_folder.name}/")
        
        all_records = []
        
        for h5_path in tqdm(h5_files, desc=h5_folder.name):
            relative = h5_path.relative_to(h5_folder)
            sub_output_dir = output_folder / relative.parent
            sub_output_dir.mkdir(parents=True, exist_ok=True)
            
            episode_id = h5_path.stem
            subset_path = str(relative.parent) if relative.parent != Path('.') else ""
            
            try:
                if 'pose_data' in h5_folder.name:
                    records = extract_pose_data(h5_path, sub_output_dir, episode_id, subset_path)
                elif 'tacniq_gsmini' in h5_folder.name:
                    records = extract_tacniq_gsmini(h5_path, sub_output_dir, episode_id, subset_path)
                elif 'xela_9dtact' in h5_folder.name:
                    records = extract_xela_9dtact(h5_path, sub_output_dir, episode_id, subset_path)
                elif 'force_data' in h5_folder.name:
                    records = extract_force_data(h5_path, sub_output_dir, episode_id, subset_path)
                else:
                    continue
                
                all_records.extend(records)
                
                episode_dir = sub_output_dir / episode_id
                json_path = episode_dir / "metadata.json"
                with open(json_path, 'w') as f:
                    json.dump(records, f, indent=2, ensure_ascii=False)
                    
            except Exception as e:
                print(f"\nError: {h5_path}: {e}")
        
        jsonl_path = output_folder / "metadata.jsonl"
        with open(jsonl_path, 'w') as f:
            for record in all_records:
                f.write(json.dumps(record, ensure_ascii=False) + '\n')
        
        print(f"  已生成 {len(all_records)} 条记录 -> {jsonl_path}")
    
    print("\n解析完成！")


def main():
    parser = argparse.ArgumentParser(description="解析 H5 文件为 HuggingFace Dataset 格式")
    parser.add_argument('--check', action='store_true', help='仅检查 H5 文件结构（不解析）')
    args = parser.parse_args()
    
    base_dir = Path(__file__).parent
    
    if args.check:
        check_h5_structure(base_dir)
    else:
        extract_all(base_dir)


if __name__ == "__main__":
    main()