import random
import string
from hashlib import md5
from typing import Any, Dict, List, Union, Optional, get_origin, get_args, Type
from pydantic import BaseModel

def gen_random_str(length=10, prefix="", suffix=""):
    """
    生成随机字符串，默认长度为10，可添加前缀和后缀
    """
    random_str = prefix + ''.join(random.choices(string.ascii_letters + string.digits, k=length)) + suffix
    return md5(random_str.encode()).hexdigest()


def split_generator(iterable, chunk_size=50):
    """
    将可迭代对象拆分为多个子列表
    """
    chunk = []
    for item in iterable:
        chunk.append(item)
        if len(chunk) == chunk_size:
            yield chunk
            chunk = []
    if chunk:
        yield chunk

async def async_split_generator(iterable, chunk_size=50):
    """
    将可迭代对象拆分为多个子列表
    """
    chunk = []
    async for item in iterable:
        chunk.append(item)
        if len(chunk) == chunk_size:
            yield chunk
            chunk = []
    if chunk:
        yield chunk

async def async_generator_to_list(iterable):
    """
    将可迭代对象转换为列表
    """
    return [item async for item in iterable]

TYPE_MAPPING = {
    "str": "string",
    "int": "number",
    "float": "number",
    "bool": "boolean",
    "list": "array",
    "dict": "object",
    "NoneType": "null",  # 注意：None 的类型名是 'NoneType'
}

def transform_pydantic_to_list(
    cls: Type[BaseModel],
    prefix: str = ""  # 新增：当前路径前缀
) -> List[Dict[str, Any]]:
    if not issubclass(cls, BaseModel):
        raise TypeError(f"{cls} is not a Pydantic BaseModel")

    result = []
    exclude_filter = getattr(cls, "__exclude_filter__", [])
    meta_mapping = getattr(cls, "__meta_mapping__", {})

    for field_name, field_info in cls.model_fields.items():
        if field_name in exclude_filter:
            continue

        # 构建当前字段的完整路径
        current_path = f"{prefix}.{field_name}" if prefix else field_name

        field_meta = meta_mapping.get(field_name, {}) or {}

        raw_type = field_info.annotation
        children = []
        display_type_name = "any"

        origin = get_origin(raw_type)
        args = get_args(raw_type)

        # 处理 Optional[T]（即 Union[T, None]）
        if origin is Union and type(None) in args:
            # 提取非 None 的类型
            non_none_types = [arg for arg in args if arg is not type(None)]
            if len(non_none_types) == 1:
                inner_type = non_none_types[0]
            else:
                inner_type = raw_type  # 多类型 Union，暂不深入处理
        else:
            inner_type = raw_type

        # 判断是否为 List[BaseModel]
        list_origin = get_origin(inner_type)
        if list_origin is list:
            item_type = get_args(inner_type)[0] if get_args(inner_type) else Any
            if isinstance(item_type, type) and issubclass(item_type, BaseModel):
                children = transform_pydantic_to_list(item_type, prefix=current_path)
            display_type_name = "list"
        elif isinstance(inner_type, type) and issubclass(inner_type, BaseModel):
            children = transform_pydantic_to_list(inner_type, prefix=current_path)
            display_type_name = "object"
        else:
            # 基础类型：获取类型名
            if inner_type is type(None):
                display_type_name = "NoneType"
            elif hasattr(inner_type, '__name__'):
                display_type_name = inner_type.__name__
            else:
                display_type_name = str(inner_type)

        frontend_type = TYPE_MAPPING.get(display_type_name, "string")

        item = {
            "value": current_path,  # ✅ 使用层级路径
            "label": field_info.description or field_name,
            "type": frontend_type,
            **field_meta,
        }
        if children:
            item["children"] = children
        result.append(item)

    return result

if __name__ == "__main__":
    print(gen_random_str())
    print(gen_random_str())
    print(gen_random_str())
    print(gen_random_str())