import json
from typing import Any, Dict

import requests

from .config import Config
from .signing import build_headers


def build_save_url(path: str) -> str:
    """Build the Save API URL."""
    return f"{Config.BASE_URL.rstrip('/')}{path}"


def _serialize_payload(payload: Any, field_name: str) -> str:
    if payload is None:
        raise ValueError(f"{field_name} 不能为空")
    if isinstance(payload, str):
        payload_value = payload.strip()
        if not payload_value:
            raise ValueError(f"{field_name} 不能为空字符串")
        return payload_value
    try:
        return json.dumps(payload, ensure_ascii=False)
    except TypeError as exc:
        raise TypeError(
            f"{field_name} 必须是可序列化的 JSON 对象或 JSON 字符串"
        ) from exc


def save(formid: str, data_payload: Any, timeout: int = 30) -> Dict[str, Any]:
    """
    Call the K3Cloud Save API.

    `data_payload` can be a JSON object or a pre-serialized JSON string.
    """
    save_service_path = "/Kingdee.BOS.WebApi.ServicesStub.DynamicFormService.Save.common.kdsvc"
    normalized_formid = str(formid or "").strip()
    if not normalized_formid:
        raise ValueError("formid 不能为空")
    payload_value = _serialize_payload(data_payload, "data_payload")

    payload = {
        "formid": normalized_formid,
        "data": payload_value,
    }

    response = requests.post(
        build_save_url(save_service_path),
        json=payload,
        headers=build_headers(save_service_path),
        timeout=timeout,
    )
    response.raise_for_status()
    return response.json()


def view(formid: str, payload: Any, timeout: int = 30) -> Dict[str, Any]:
    """
    Call the K3Cloud View API.

    `payload` can be a JSON object or a pre-serialized JSON string.
    """
    view_service_path = "/Kingdee.BOS.WebApi.ServicesStub.DynamicFormService.View.common.kdsvc"
    normalized_formid = str(formid or "").strip()
    if not normalized_formid:
        raise ValueError("formid 不能为空")
    payload_value = _serialize_payload(payload, "payload")

    request_body = {
        "formid": normalized_formid,
        "data": payload_value,
    }

    response = requests.post(
        build_save_url(view_service_path),
        json=request_body,
        headers=build_headers(view_service_path),
        timeout=timeout,
    )
    response.raise_for_status()
    return response.json()