import os
import shutil
import json
import re
from collections import defaultdict


def extract_leading_digits(prefix):
    """提取前缀中最前面的连续数字，无数字则返回None"""
    match = re.match(r'^(\d+)', prefix)
    return match.group(1) if match else None


def compare_json_and_prefixes(json_file_path):
    """对比JSON中的.dat键名和提取的前缀，找出差异"""
    try:
        print("\n" + "=" * 80)
        print("第一步：JSON键名与提取前缀对比分析")
        print("=" * 80)
        
        # 1. 读取JSON所有.dat键名
        json_keys = []
        with open(json_file_path, 'r', encoding='utf-8') as f:
            dat_mapping = json.load(f)
            for key in dat_mapping.keys():
                key_stripped = key.strip()
                if key_stripped.endswith('.dat'):
                    json_keys.append(key_stripped)
        
        total_json_keys = len(json_keys)
        print(f"1. 从JSON中读取到 {total_json_keys} 个.dat键名")

        # 2. 提取前缀并分析
        extracted_prefixes = {}
        prefix_to_keys = defaultdict(list)  # 记录前缀对应的所有键名
        for key in json_keys:
            original_prefix = os.path.splitext(key)[0].strip()
            lower_prefix = original_prefix.lower()
            extracted_prefixes[lower_prefix] = original_prefix
            prefix_to_keys[lower_prefix].append(key)
        
        total_extracted = len(extracted_prefixes)
        print(f"2. 提取到 {total_extracted} 个唯一前缀")

        # 3. 分析差异原因
        if total_extracted < total_json_keys:
            diff_count = total_json_keys - total_extracted
            print(f"\n⚠️  发现差异：前缀数比JSON键名少 {diff_count} 个")
            print("   原因：存在不同键名对应相同前缀的情况（如下所示）")
            
            # 显示前5个存在重复前缀的例子
            duplicate_prefixes = {p: keys for p, keys in prefix_to_keys.items() if len(keys) > 1}
            print(f"\n   存在重复前缀的键名数量：{len(duplicate_prefixes)} 组")
            for i, (prefix, keys) in enumerate(list(duplicate_prefixes.items())[:5], 1):
                print(f"   示例 {i}: 前缀 '{prefix}' 对应 {len(keys)} 个键名 → {keys[:2]}...")
        else:
            print("\n✅ 前缀数与JSON键名数一致，无差异")

        return json_keys, prefix_to_keys

    except Exception as e:
        print(f"❌ 对比分析失败: {str(e)}")
        return [], {}


def copy_obj_files(json_file_path, obj_source_dir, dest_dir, json_keys):
    """复制OBJ文件，基于JSON中的.dat键名"""
    try:
        print("\n" + "=" * 80)
        print("第二步：OBJ文件复制操作")
        print("=" * 80)
        
        # 1. 初始化目录
        os.makedirs(dest_dir, exist_ok=True)
        print(f"📂 目标目录已准备：{dest_dir}")

        # 2. 预处理OBJ文件
        obj_lower_to_info = {}
        for filename in os.listdir(obj_source_dir):
            if filename.lower().endswith('.obj'):
                obj_original_prefix = os.path.splitext(filename)[0].strip()
                obj_lower_prefix = obj_original_prefix.lower()
                obj_full_path = os.path.join(obj_source_dir, filename)
                obj_lower_to_info[obj_lower_prefix] = (obj_original_prefix, obj_full_path)
        print(f"🔍 已预处理 {len(obj_lower_to_info)} 个OBJ文件")

        # 3. 提取所有dat前缀（保留原始顺序）
        dat_prefixes = [os.path.splitext(key)[0].strip() for key in json_keys]
        print(f"📋 待匹配的dat前缀总数：{len(dat_prefixes)} 个")

        # 4. 第一次匹配：完整前缀匹配
        first_copied = []  # [(dat前缀, OBJ文件名)]
        for prefix in dat_prefixes:
            lower_prefix = prefix.lower()
            if lower_prefix in obj_lower_to_info:
                obj_original, obj_path = obj_lower_to_info[lower_prefix]
                obj_filename = os.path.basename(obj_path)
                dest_path = os.path.join(dest_dir, obj_filename)
                
                if not os.path.exists(dest_path):
                    shutil.copy2(obj_path, dest_path)
                first_copied.append((prefix, obj_filename))
        
        print(f"\n第一次匹配完成：{len(first_copied)} 个前缀匹配成功")

        # 5. 第二次匹配：未匹配前缀提取前导数字
        matched_prefixes = {p for p, _ in first_copied}
        not_found_first = [p for p in dat_prefixes if p not in matched_prefixes]
        print(f"初始未匹配的前缀：{len(not_found_first)} 个")

        second_copied = []  # [(dat前缀, OBJ文件名, 提取的数字)]
        if not_found_first:
            for prefix in not_found_first:
                leading_digits = extract_leading_digits(prefix)
                if not leading_digits:
                    continue
                
                target_lower = leading_digits.lower()
                if target_lower in obj_lower_to_info:
                    obj_original, obj_path = obj_lower_to_info[target_lower]
                    obj_filename = os.path.basename(obj_path)
                    dest_path = os.path.join(dest_dir, obj_filename)
                    
                    if not os.path.exists(dest_path):
                        shutil.copy2(obj_path, dest_path)
                    second_copied.append((prefix, obj_filename, leading_digits))
        
        print(f"第二次匹配完成：{len(second_copied)} 个前缀匹配成功")

        # 6. 最终结果汇总
        print("\n" + "=" * 60)
        print("最终结果汇总")
        print("=" * 60)
        total_matched = len(first_copied) + len(second_copied)
        print(f"📊 统计信息：")
        print(f"   - JSON中.dat键名总数：{len(json_keys)}")
        print(f"   - 第一次匹配成功：{len(first_copied)}")
        print(f"   - 第二次匹配成功：{len(second_copied)}")
        print(f"   - 总匹配成功：{total_matched}")
        print(f"   - 最终未匹配：{len(dat_prefixes) - total_matched}")

        print(f"\n🏁 所有操作完成！复制的文件保存至：{dest_dir}")

    except Exception as e:
        print(f"❌ 复制操作失败: {str(e)}")


def main():
    # 配置文件路径
    JSON_FILE_PATH = "/public/home/wangshuo/gap/assembly/data/car_1k/subset_self/label_mapping_freq.json"
    OBJ_SOURCE_DIR = "/public/home/wangshuo/gap/assembly/data/part_obj"
    DEST_DIR = "/public/home/wangshuo/gap/assembly/data/part_obj_300"

    # 执行完整流程
    print("=" * 80)
    print("JSON键名分析与OBJ文件复制工具")
    print("=" * 80)
    
    # 第一步：分析JSON键名与前缀的关系
    json_keys, _ = compare_json_and_prefixes(JSON_FILE_PATH)
    if not json_keys:
        print("❌ 未获取到有效的JSON键名，无法继续操作")
        return
    
    # 第二步：基于分析结果进行OBJ文件复制
    copy_obj_files(JSON_FILE_PATH, OBJ_SOURCE_DIR, DEST_DIR, json_keys)


if __name__ == "__main__":
    main()