#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""预览参数解析（对标 JNPF parameterData 子集）"""
from __future__ import annotations

from datetime import date, datetime
from typing import Any, Dict, Optional


def _today_str() -> str:
    return date.today().isoformat()


def _now_str() -> str:
    return datetime.now().strftime("%Y-%m-%d %H:%M:%S")


def build_system_params(
    *,
    user_id: Optional[str] = None,
    user_name: Optional[str] = None,
    dept_id: Optional[str] = None,
    dept_name: Optional[str] = None,
    tenant_id: Optional[str] = None,
) -> Dict[str, Any]:
    """系统变量，与 JNPF parameterData 常用键对齐。"""
    params: Dict[str, Any] = {
        "currentDate": _today_str(),
        "currentTime": _now_str(),
        "currentUserId": user_id or "",
        "currentUserName": user_name or "",
        "currentDeptId": dept_id or "",
        "currentDeptName": dept_name or "",
        "currentTenantId": tenant_id or "",
    }
    # 兼容 #{userName} / #{deptName} 简写
    if user_name:
        params.setdefault("userName", user_name)
    if dept_name:
        params.setdefault("deptName", dept_name)
    return params


def merge_preview_params(
    query_defaults: Optional[Dict[str, Any]] = None,
    request_params: Optional[Dict[str, Any]] = None,
    system_params: Optional[Dict[str, Any]] = None,
) -> Dict[str, Any]:
    """合并顺序：query 默认 → 系统变量 → 请求参数（请求优先）。"""
    merged: Dict[str, Any] = {}
    for src in (query_defaults or {}, system_params or {}, request_params or {}):
        for k, v in src.items():
            if v is not None and v != "":
                merged[k] = v
    return merged