import type {
  BacktestRequest,
  BacktestResponse,
  ScreenerRunRequest,
  ScreenerRunResponse,
  ScreenerSyncRequest,
  ScreenerSyncStatus,
  SyncRequest,
  SyncResponse,
} from './types';

// dev 用 Vite 代理（/api -> :8000）；生产构建设 VITE_API_BASE 指向后端地址。
const BASE = import.meta.env.VITE_API_BASE ?? '';

export async function postBacktest(req: BacktestRequest): Promise<BacktestResponse> {
  const res = await fetch(`${BASE}/api/backtest`, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify(req),
  });
  if (!res.ok) {
    throw new Error(`回测请求失败 (HTTP ${res.status}): ${await res.text()}`);
  }
  return (await res.json()) as BacktestResponse;
}

export async function syncData(req: SyncRequest): Promise<SyncResponse> {
  const res = await fetch(`${BASE}/api/data/sync`, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify(req),
  });
  if (!res.ok) {
    throw new Error(`数据拉取失败 (HTTP ${res.status}): ${await res.text()}`);
  }
  return (await res.json()) as SyncResponse;
}

// ---------- 智能选股 ----------
export async function runScreener(req: ScreenerRunRequest): Promise<ScreenerRunResponse> {
  const res = await fetch(`${BASE}/api/screener/run`, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify(req),
  });
  if (!res.ok) {
    // 后端 detail 字段携带可读中文原因（503 未配 key / 409 未同步 / 502 LLM 错）
    let detail = '';
    try {
      detail = (await res.json())?.detail ?? '';
    } catch {
      detail = await res.text();
    }
    throw new Error(detail || `选股失败 (HTTP ${res.status})`);
  }
  return (await res.json()) as ScreenerRunResponse;
}

export async function startScreenerSync(req: ScreenerSyncRequest = {}): Promise<ScreenerSyncStatus> {
  const res = await fetch(`${BASE}/api/screener/sync`, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify(req),
  });
  if (!res.ok) {
    let detail = '';
    try {
      detail = (await res.json())?.detail ?? '';
    } catch {
      detail = await res.text();
    }
    throw new Error(detail || `启动同步失败 (HTTP ${res.status})`);
  }
  return (await res.json()) as ScreenerSyncStatus;
}

export async function getScreenerSyncStatus(): Promise<ScreenerSyncStatus> {
  const res = await fetch(`${BASE}/api/screener/sync/status`);
  if (!res.ok) throw new Error(`获取同步状态失败 (HTTP ${res.status})`);
  return (await res.json()) as ScreenerSyncStatus;
}