#!/usr/bin/env python3
import csv
import json
import sys
import os

def main():
    if len(sys.argv) < 2:
        print("❌ 使用错误！")
        print("用法: csv2json <输入CSV文件路径> [输出JSON文件路径]")
        sys.exit(1)

    csv_path = sys.argv[1]
    json_path = sys.argv[2] if len(sys.argv) == 3 else os.path.splitext(csv_path)[0] + ".json"

    try:
        cleaned_data = []
        
        with open(csv_path, mode='r', encoding='utf-8-sig') as f:
            reader = csv.DictReader(f)
            
            for row in reader:
                # 💡 核心过滤逻辑：
                # 只有当 key 不为 None、不为空字符串、且去掉空格后不为空时，才保留该列
                filtered_row = {
                    key: value 
                    for key, value in row.items() 
                    if key is not None and str(key).strip() != ""
                }
                
                # 只有这一行过滤后还包含有效数据，才写入结果
                if filtered_row:
                    cleaned_data = cleaned_data + [filtered_row]

        with open(json_path, mode='w', encoding='utf-8') as f:
            json.dump(cleaned_data, f, indent=4, ensure_ascii=False)
            
        print(f"✅ 成功排除空列并转换: {csv_path} -> {json_path}")
    except Exception as e:
        print(f"❌ 转换失败: {e}")

if __name__ == '__main__':
    main()