import type { KisRuntimeCredentials } from "@/features/dashboard/store/use-kis-runtime-store";
import type {
  DashboardChartTimeframe,
  DashboardStockCashOrderRequest,
  DashboardStockCashOrderResponse,
  DashboardStockChartResponse,
  DashboardStockOrderBookResponse,
  DashboardStockOverviewResponse,
  DashboardStockSearchResponse,
} from "@/features/dashboard/types/dashboard.types";
import {
  DOMESTIC_KIS_SESSION_OVERRIDE_HEADER,
  DOMESTIC_KIS_SESSION_OVERRIDE_STORAGE_KEY,
  parseDomesticKisSession,
} from "@/lib/kis/domestic-market-session";

/**
 * 종목 검색 API 호출
 * @param keyword 검색어
 */
export async function fetchStockSearch(
  keyword: string,
  signal?: AbortSignal,
): Promise<DashboardStockSearchResponse> {
  const response = await fetch(
    `/api/kis/domestic/search?q=${encodeURIComponent(keyword)}`,
    {
      cache: "no-store",
      signal,
    },
  );

  const payload = (await response.json()) as
    | DashboardStockSearchResponse
    | { error?: string };

  if (!response.ok) {
    throw new Error(
      "error" in payload ? payload.error : "종목 검색 중 오류가 발생했습니다.",
    );
  }

  return payload as DashboardStockSearchResponse;
}

/**
 * 종목 상세 개요 조회 API 호출
 * @param symbol 종목코드
 * @param credentials KIS 인증 정보
 */
export async function fetchStockOverview(
  symbol: string,
  credentials: KisRuntimeCredentials,
): Promise<DashboardStockOverviewResponse> {
  const response = await fetch(
    `/api/kis/domestic/overview?symbol=${encodeURIComponent(symbol)}`,
    {
      method: "GET",
      headers: buildKisRequestHeaders(credentials),
      cache: "no-store",
    },
  );

  const payload = (await response.json()) as
    | DashboardStockOverviewResponse
    | { error?: string };

  if (!response.ok) {
    throw new Error(
      "error" in payload ? payload.error : "종목 조회 중 오류가 발생했습니다.",
    );
  }

  return payload as DashboardStockOverviewResponse;
}

/**
 * 종목 호가 조회 API 호출
 * @param symbol 종목코드
 * @param credentials KIS 인증 정보
 */
export async function fetchStockOrderBook(
  symbol: string,
  credentials: KisRuntimeCredentials,
  signal?: AbortSignal,
): Promise<DashboardStockOrderBookResponse> {
  const response = await fetch(
    `/api/kis/domestic/orderbook?symbol=${encodeURIComponent(symbol)}`,
    {
      method: "GET",
      headers: buildKisRequestHeaders(credentials),
      cache: "no-store",
      signal,
    },
  );

  const payload = (await response.json()) as
    | DashboardStockOrderBookResponse
    | { error?: string };

  if (!response.ok) {
    throw new Error(
      "error" in payload ? payload.error : "호가 조회 중 오류가 발생했습니다.",
    );
  }

  return payload as DashboardStockOrderBookResponse;
}

/**
 * 종목 차트(분봉/일봉/주봉) 조회 API 호출
 */
export async function fetchStockChart(
  symbol: string,
  timeframe: DashboardChartTimeframe,
  credentials: KisRuntimeCredentials,
  cursor?: string,
): Promise<DashboardStockChartResponse> {
  const query = new URLSearchParams({
    symbol,
    timeframe,
  });
  if (cursor) query.set("cursor", cursor);

  const response = await fetch(`/api/kis/domestic/chart?${query.toString()}`, {
    method: "GET",
    headers: buildKisRequestHeaders(credentials),
    cache: "no-store",
  });

  const payload = (await response.json()) as
    | DashboardStockChartResponse
    | { error?: string };

  if (!response.ok) {
    throw new Error(
      "error" in payload ? payload.error : "차트 조회 중 오류가 발생했습니다.",
    );
  }

  return payload as DashboardStockChartResponse;
}

/**
 * 주식 현금 주문 API 호출
 * @param request 주문 요청 데이터
 * @param credentials KIS 인증 정보
 */
export async function fetchOrderCash(
  request: DashboardStockCashOrderRequest,
  credentials: KisRuntimeCredentials,
): Promise<DashboardStockCashOrderResponse> {
  const response = await fetch("/api/kis/domestic/order-cash", {
    method: "POST",
    headers: buildKisRequestHeaders(credentials, { jsonContentType: true }),
    body: JSON.stringify(request),
    cache: "no-store",
  });

  const payload = (await response.json()) as DashboardStockCashOrderResponse;

  if (!response.ok) {
    throw new Error(payload.message || "주문 전송 중 오류가 발생했습니다.");
  }

  return payload;
}

function buildKisRequestHeaders(
  credentials: KisRuntimeCredentials,
  options?: { jsonContentType?: boolean },
) {
  const headers: Record<string, string> = {
    "x-kis-app-key": credentials.appKey,
    "x-kis-app-secret": credentials.appSecret,
    "x-kis-trading-env": credentials.tradingEnv,
  };

  if (options?.jsonContentType) {
    headers["content-type"] = "application/json";
  }

  const sessionOverride = readSessionOverrideForDev();
  if (sessionOverride) {
    headers[DOMESTIC_KIS_SESSION_OVERRIDE_HEADER] = sessionOverride;
  }

  return headers;
}

function readSessionOverrideForDev() {
  if (typeof window === "undefined") return null;

  try {
    const raw = window.localStorage.getItem(
      DOMESTIC_KIS_SESSION_OVERRIDE_STORAGE_KEY,
    );
    return parseDomesticKisSession(raw);
  } catch {
    return null;
  }
}