"""把 ERP 原始对象缩减为下游允许保存的货运字段。"""

from __future__ import annotations

from collections.abc import Mapping
from typing import Any

from .errors import ERPProtocolError


def normalize_freight_result(result: Mapping[str, Any]) -> dict[str, Any]:
    records = result.get("records")
    if not isinstance(records, list):
        raise ERPProtocolError("货运查询结果缺少 records 数组")

    orders: list[dict[str, Any]] = []
    seen_orders: dict[str, dict[str, Any]] = {}
    for record in records:
        if not isinstance(record, Mapping):
            raise ERPProtocolError("货运查询结果包含非对象记录")
        stock = record.get("stock")
        detail = record.get("detail")
        if not isinstance(stock, Mapping) or not isinstance(detail, Mapping):
            raise ERPProtocolError("货运记录缺少 stock 或 detail 对象")

        stock_id = _external_id(stock.get("id"), "货运单")
        detail_id = _external_id(detail.get("id"), "货运详情")
        if stock_id != detail_id:
            raise ERPProtocolError("货运列表和详情身份不一致")

        raw_items = detail.get("details")
        if not isinstance(raw_items, list):
            raise ERPProtocolError("货运详情缺少 details 数组")
        item_by_id: dict[str, dict[str, Any]] = {}
        for raw_item in raw_items:
            if not isinstance(raw_item, Mapping):
                raise ERPProtocolError("货运商品明细包含非对象元素")
            item = _normalize_item(raw_item)
            existing = item_by_id.get(item["external_item_id"])
            if existing is not None and existing != item:
                raise ERPProtocolError("货运商品明细存在冲突的重复身份")
            item_by_id[item["external_item_id"]] = item

        order = {
            "external_stock_id": stock_id,
            "source_code": _text(stock.get("code")),
            "platform_order_no": _optional_text(stock.get("orderCode")),
            "shop_name": _optional_text(
                detail.get("shopName")
                if _text(detail.get("shopName"))
                else stock.get("shopName")
            ),
            "source_created_at": _optional_text(
                detail.get("created")
                if _text(detail.get("created"))
                else stock.get("created")
            ),
            "order_status": _optional_scalar(
                stock.get("orderStatus")
                if stock.get("orderStatus") is not None
                else detail.get("status")
            ),
            "purchase_status": _optional_scalar(stock.get("purchaseStatus")),
            "is_canceled": _optional_bool(stock.get("isCancel")),
            "items": sorted(
                item_by_id.values(),
                key=lambda value: _identity_sort_key(
                    value["external_item_id"]
                ),
            ),
        }
        existing_order = seen_orders.get(stock_id)
        if existing_order is not None and existing_order != order:
            raise ERPProtocolError("货运查询结果存在冲突的重复货运单")
        seen_orders[stock_id] = order

    orders.extend(
        sorted(
            seen_orders.values(),
            key=lambda value: _identity_sort_key(
                value["external_stock_id"]
            ),
        )
    )
    return {
        "schema_version": 1,
        "query": {"mode": "ORDER_NUMBER"},
        "orders": orders,
    }


def _normalize_item(item: Mapping[str, Any]) -> dict[str, Any]:
    title = _text(item.get("productTitle"))
    if not title:
        title = _text(item.get("detailProductName"))
    sku = _text(item.get("sku"))
    if not sku:
        sku = _text(item.get("variationSku"))
    return {
        "external_item_id": _external_id(item.get("id"), "货运商品"),
        "title": title,
        "product_spec": _text(item.get("productSpec")),
        "sku": sku,
        "quantity": _positive_int_or_none(item.get("productQty")),
        "product_thumb_ref": _optional_scalar(item.get("productThumb")),
        "purchase_status": _optional_scalar(item.get("purchaseStatus")),
    }


def _external_id(value: Any, label: str) -> str:
    if isinstance(value, bool):
        raise ERPProtocolError(f"{label}外部身份无效")
    try:
        normalized = int(value)
    except (TypeError, ValueError) as exc:
        raise ERPProtocolError(f"{label}外部身份无效") from exc
    if normalized <= 0:
        raise ERPProtocolError(f"{label}外部身份无效")
    return str(normalized)


def _positive_int_or_none(value: Any) -> int | None:
    if isinstance(value, bool):
        return None
    try:
        normalized = int(value)
    except (TypeError, ValueError):
        return None
    return normalized if normalized > 0 else None


def _text(value: Any) -> str:
    return value.strip() if isinstance(value, str) else ""


def _optional_text(value: Any) -> str | None:
    normalized = _text(value)
    return normalized or None


def _optional_scalar(value: Any) -> str | None:
    if value is None or isinstance(value, (dict, list, tuple, set)):
        return None
    normalized = str(value).strip()
    return normalized or None


def _optional_bool(value: Any) -> bool | None:
    if isinstance(value, bool):
        return value
    if value in (0, "0"):
        return False
    if value in (1, "1"):
        return True
    return None


def _identity_sort_key(value: str) -> tuple[int, str]:
    return (int(value), value)