import json
from pydantic import field_validator, BaseModel

class SearchRequest(BaseModel):
    mode: str
    items: list
    scale: list
    filter_string: str = ""
    sort_col: str = "max_similarity"
    sort_descending: bool = True
    page_index: int = 0
    page_size: int = 5
    session_id: str = ""

    @field_validator('items', 'scale', mode='before')
    @classmethod
    def parse_json_string(cls, v):

        if isinstance(v, list) and len(v) > 0:
            v = v[0]
        if isinstance(v, str):
            return json.loads(v)
        return v