from __future__ import annotations

from dataclasses import dataclass
from datetime import date


PRIMARY_FIELD_NAME = "货品编码"
PRIMARY_FIELD_SOURCE = "统一规格编码"


@dataclass(frozen=True)
class BrandSyncTarget:
    brand_name: str
    table_name: str


@dataclass(frozen=True)
class FieldSpec:
    feishu_name: str
    source_name: str
    field_type: int
    formatter: str | None = None
    scale: int | None = None


BRAND_SYNC_TARGETS = [
    BrandSyncTarget(brand_name="羽心堂", table_name="羽心堂"),
]


def month_sales_field_name(month_offset: int, today: date | None = None) -> str:
    current = today or date.today()
    month_index = current.year * 12 + current.month - 1 - month_offset
    year = month_index // 12
    month = month_index % 12 + 1
    return f"{year}{month:02d}销售数量"


FIELD_SPECS = [
    FieldSpec("货品名称", "商品名称", 1),
    FieldSpec("分类", "一级分类", 1),
    FieldSpec("条形码", "条形码", 1),
    FieldSpec("零售价", "零售价", 2, "0.00", 2),
    FieldSpec("店铺名称", "店铺名称", 1),
    FieldSpec("店铺可用库存", "店铺挂单量", 2, "0", 0),
    FieldSpec("总库存", "总库存", 2, "0", 0),
    FieldSpec(month_sales_field_name(0), "本月销售数量", 2, "0", 0),
    FieldSpec(month_sales_field_name(1), "上月销售数量", 2, "0", 0),
    FieldSpec(month_sales_field_name(2), "上上月销售数量", 2, "0", 0),
    FieldSpec("品牌", "品牌名称", 1),
    FieldSpec("产品类别", "货品简称", 1),
]

LEGACY_NAME_MAP = {
    "品牌名称": "品牌",
    "一级分类": "分类",
    "货品简称": "产品类别",
    "商品名称": "货品名称",
    "店铺挂单量": "店铺可用库存",
    "本月销售数量": month_sales_field_name(0),
    "上月销售数量": month_sales_field_name(1),
    "上上月销售数量": month_sales_field_name(2),
    "统一规格编码": PRIMARY_FIELD_NAME,
}