// 核心股历史数据获取工具
import { getApiBaseUrl } from "@/lib/api-client";

export interface ActiveCoreStock {
  stockCode: string;
  stockName: string;
  coverCount: number | null; // 覆盖题材数
  dailyGains: Record<string, number | null>; // 日期 -> 当日涨幅(可空)
  appearCount: number;
  lastAppear: string | null;
  daysSinceLastAppear: number; // 最近上榜距窗口最新交易日的自然日差
  themes: { theme_code: string; theme_name: string }[]; // 所属题材列表
}

export interface ActiveCoreStocksResponse {
  dates: string[];
  stocks: ActiveCoreStock[];
}

export interface CoreStockHistoryItem {
  id: number;
  trade_date: string;
  stock_code: string;
  stock_name: string;
  f3: number | null;
  cover_count: number | null;
  rank: number;
  themes: { theme_code: string; theme_name: string }[];
}

export interface CoreStockHistoryResponse {
  date: string;
  items: CoreStockHistoryItem[];
}

/** 获取活跃核心股 + 最近N日涨幅矩阵 */
export async function fetchActiveCoreStocks(days: number = 10): Promise<ActiveCoreStocksResponse> {
  const baseUrl = getApiBaseUrl();
  try {
    const resp = await fetch(`${baseUrl}/api/core-stocks/active?days=${days}`, { method: "GET", cache: "no-store" });
    if (!resp.ok) return { dates: [], stocks: [] };
    return resp.json();
  } catch (err) {
    console.error("[core-stock-api] 获取活跃核心股失败:", err);
    return { dates: [], stocks: [] };
  }
}

/** 获取指定交易日核心股(含所属题材) */
export async function fetchCoreStockHistory(date: string): Promise<CoreStockHistoryResponse | null> {
  const baseUrl = getApiBaseUrl();
  try {
    const resp = await fetch(`${baseUrl}/api/core-stocks/history?date=${date}`, { method: "GET", cache: "no-store" });
    if (!resp.ok) return null;
    return resp.json();
  } catch (err) {
    console.error("[core-stock-api] 获取核心股历史失败:", err);
    return null;
  }
}