"""OA 日期时间：PC / 小程序 valueFormat 对齐与历史到分数据兼容。

PC FormCreate（Element）在 datetime 未配置 valueFormat 时默认为
``YYYY-MM-DD HH:mm:ss``；小程序曾默认到分，导致回显空白。
本模块：对「期望到秒」的字段，将 ``YYYY-MM-DD HH:mm`` 补 ``:00``。
请假/加班等显式配置到分的字段不受影响。
"""
from __future__ import annotations

import re
from typing import Any, Dict, List, Optional

_MINUTE_ONLY_RE = re.compile(r"^(\d{4}-\d{2}-\d{2})[ T](\d{2}:\d{2})$")


def _extract_rules(form_schema: Any) -> List[Any]:
    if form_schema is None:
        return []
    if isinstance(form_schema, list):
        return form_schema
    if isinstance(form_schema, dict):
        rule = form_schema.get("rule")
        if isinstance(rule, list):
            return rule
    return []


def _walk_rules(rules: List[Any], out: Optional[List[dict]] = None) -> List[dict]:
    out = out if out is not None else []
    for r in rules or []:
        if not isinstance(r, dict):
            continue
        out.append(r)
        children = r.get("children")
        if isinstance(children, list):
            _walk_rules(children, out)
        props = r.get("props") or {}
        nested = props.get("rule") if isinstance(props, dict) else None
        if isinstance(nested, list):
            _walk_rules(nested, out)
    return out


def _effective_value_format(rule: dict) -> str:
    props = rule.get("props") if isinstance(rule.get("props"), dict) else {}
    explicit = str(props.get("valueFormat") or props.get("format") or "").strip()
    if explicit:
        return explicit
    picker = str(props.get("type") or "date").lower()
    if picker in ("datetime", "datetimerange"):
        return "YYYY-MM-DD HH:mm:ss"
    if picker in ("year",):
        return "YYYY"
    if picker in ("month", "monthrange"):
        return "YYYY-MM"
    return "YYYY-MM-DD"


def _expects_seconds(fmt: str) -> bool:
    f = str(fmt or "")
    return "ss" in f or "SS" in f


def _pad_one(val: Any) -> Any:
    if not isinstance(val, str):
        return val
    s = val.strip()
    m = _MINUTE_ONLY_RE.match(s)
    if not m:
        return val
    return f"{m.group(1)} {m.group(2)}:00"


def _pad_value(val: Any) -> Any:
    if isinstance(val, list):
        return [_pad_one(x) for x in val]
    return _pad_one(val)


def normalize_datetime_form_values(
    form_schema: Any, form_data: Optional[Dict[str, Any]]
) -> Dict[str, Any]:
    """对期望到秒的 datePicker 字段，将到分字符串补全为到秒。返回新 dict，不改入参。"""
    data = dict(form_data or {})
    for rule in _walk_rules(_extract_rules(form_schema)):
        typ = str(rule.get("type") or "").lower()
        if typ not in ("datepicker", "fcdatepicker", "date"):
            continue
        field = rule.get("field")
        if not field or field not in data:
            continue
        fmt = _effective_value_format(rule)
        if not _expects_seconds(fmt):
            continue
        data[field] = _pad_value(data.get(field))
    return data