import os
import json

def check_image_paths(base_dir):
    # 需要检查的数据集文件夹列表
    datasets = ["BlendPASS", "DeepAccident", "NuScenes"]
    json_files = ["train.json", "val.json"]

    total_missing = 0
    missing_details = []

    print(f"开始检查目录: {base_dir} ...\n")

    for dataset in datasets:
        dataset_dir = os.path.join(base_dir, dataset)
        if not os.path.exists(dataset_dir):
            print(f"⚠️  警告: 找不到数据集目录 {dataset_dir}")
            continue

        for json_name in json_files:
            json_path = os.path.join(dataset_dir, json_name)
            if not os.path.exists(json_path):
                continue
                
            print(f"正在检查文件: {os.path.relpath(json_path, base_dir)} ...")
            
            with open(json_path, 'r', encoding='utf-8') as f:
                try:
                    data = json.load(f)
                except json.JSONDecodeError:
                    print(f"❌ 错误: JSON解析失败 {json_path}")
                    continue

            missing_in_file = 0
            
            # 假设json是一个列表，每个元素是一个含有 'image' 键的字典
            if isinstance(data, list):
                for item in data:
                    img_rel_path = item.get("image")
                    if img_rel_path:
                        # 相对路径是相对于当前 JSON 文件的路径
                        # '../../Panorama/DeepAccident/...'
                        abs_img_path = os.path.abspath(os.path.join(os.path.dirname(json_path), img_rel_path))
                        
                        if not os.path.exists(abs_img_path):
                            missing_in_file += 1
                            total_missing += 1
                            missing_details.append(f"[{dataset}/{json_name}] 缺失: {os.path.relpath(abs_img_path, base_dir)} (原始字段: {img_rel_path})")
            
            if missing_in_file > 0:
                print(f"  ❌ 发现缺失: {missing_in_file} 张图片无法访问。")
            else:
                print(f"  ✅ 完美: 所有 {len(data)} 条数据的图片均存在！")
        print("-" * 50)

    print("\n================ 检查报告 ================")
    if total_missing == 0:
        print("🎉 恭喜！所有的 JSON 文件里的图片都能找到！")
    else:
        print(f"⚠️  警告！总共发现了 {total_missing} 处图片缺失。")
        print("前 20 条缺失详情如下：")
        for detail in missing_details[:20]:
            print(f"  - {detail}")
        if total_missing > 20:
            print(f"  ... 以及其他 {total_missing - 20} 条。")       
        
        # 将缺失文件保存为日志
        log_path = os.path.join(base_dir, "missing_images.log")
        with open(log_path, 'w', encoding='utf-8') as lg:
            lg.write('\n'.join(missing_details))
        print(f"\n📝 完整的缺失列表已保存至: {log_path}")

if __name__ == "__main__":
    BASE_DIR = "/home/hk-project-pai00053/wd1434/programmes/PLM/PanoVQA/PanoVQA"
    check_image_paths(BASE_DIR)