/**
 * @file app/api/kis/indices/route.ts
 * @description 국내 KOSPI/KOSDAQ 지수 조회 API
 *
 * @description [주요 책임]
 * - 로그인 및 KIS API 설정 여부 확인
 * - `getDomesticDashboardIndices` 함수를 호출하여 지수 데이터를 조회
 * - 조회된 데이터를 클라이언트에 JSON 형식으로 반환
 */
import { NextResponse } from "next/server";
import { hasKisConfig } from "@/lib/kis/config";
import { getDomesticDashboardIndices } from "@/lib/kis/dashboard";
import { hasKisApiSession } from "@/app/api/kis/_session";
import {
  createKisApiErrorResponse,
  KIS_API_ERROR_CODE,
  toKisApiErrorMessage,
} from "@/app/api/kis/_response";
import { readKisCredentialsFromHeaders } from "@/app/api/kis/domestic/_shared";

export async function GET(request: Request) {
  const hasSession = await hasKisApiSession();
  if (!hasSession) {
    return createKisApiErrorResponse({
      status: 401,
      code: KIS_API_ERROR_CODE.AUTH_REQUIRED,
      message: "로그인이 필요합니다.",
    });
  }

  const credentials = readKisCredentialsFromHeaders(request.headers);

  if (!hasKisConfig(credentials)) {
    return createKisApiErrorResponse({
      status: 400,
      code: KIS_API_ERROR_CODE.CREDENTIAL_REQUIRED,
      message: "KIS API 키 설정이 필요합니다.",
    });
  }

  try {
    const indices = await getDomesticDashboardIndices(credentials);
    return NextResponse.json(
      {
        indices,
        fetchedAt: new Date().toISOString(),
      },
      {
        headers: {
          "cache-control": "no-store",
        },
      },
    );
  } catch (error) {
    return createKisApiErrorResponse({
      status: 500,
      code: KIS_API_ERROR_CODE.UPSTREAM_FAILURE,
      message: toKisApiErrorMessage(
        error,
        "지수 조회 중 오류가 발생했습니다.",
      ),
    });
  }
}