"""Crypto symbol → Chinese display name for screener UI."""

from __future__ import annotations

# Base asset → 中文名（覆盖 provider 当前币对；未知则回退 base）
_BASE_CN: dict[str, str] = {
    "BTC": "比特币",
    "ETH": "以太坊",
    "SOL": "索拉纳",
    "XAU": "黄金",
    "XAG": "白银",
    "SAGA": "Saga",
    "CL": "原油",
    "ZEC": "大零币",
    "XRP": "瑞波币",
    "DOGE": "狗狗币",
    "BNB": "币安币",
    "SUI": "Sui",
    "BILL": "Bill",
    "BZ": "BZ",
    "LAB": "Lab",
    "TON": "通联币",
    "CRCL": "Circle",
    "SNDK": "SNDK",
    "1000PEPE": "千倍佩佩",
    "PEPE": "佩佩",
    "CHIP": "CHIP",
    "WIF": "狗帽子",
}


def base_asset(symbol: str) -> str:
    """BTC/USDT:USDT → BTC；1000PEPE/USDT:USDT → 1000PEPE."""
    s = (symbol or "").strip()
    if not s:
        return ""
    head = s.split(":")[0]
    return head.split("/")[0].upper() if "/" in head else head.upper()


def display_name_cn(symbol: str) -> str:
    base = base_asset(symbol)
    if not base:
        return symbol or ""
    return _BASE_CN.get(base, base)


def symbol_name_map(symbols: list[str] | None = None) -> dict[str, str]:
    if not symbols:
        return {f"{k}/USDT:USDT": v for k, v in _BASE_CN.items()}
    return {s: display_name_cn(s) for s in symbols}