import type { DashboardKisValidateResponse } from "@/features/trade/types/trade.types";
import { normalizeTradingEnv } from "@/lib/kis/config";
import {
  parseKisCredentialRequest,
  validateKisCredentialInput,
} from "@/lib/kis/request";
import { getKisAccessToken } from "@/lib/kis/token";
import { hasKisApiSession } from "@/app/api/kis/_session";
import {
  createKisApiErrorResponse,
  KIS_API_ERROR_CODE,
  toKisApiErrorMessage,
} from "@/app/api/kis/_response";
import { NextRequest, NextResponse } from "next/server";

/**
 * @file app/api/kis/validate/route.ts
 * @description 사용자 입력 KIS API 키를 검증합니다.
 */

/**
 * @description 액세스 토큰 발급 성공 여부로 API 키를 검증합니다.
 * @see features/settings/components/KisAuthForm.tsx
 */
export async function POST(request: NextRequest) {
  const credentials = await parseKisCredentialRequest(request);
  const tradingEnv = normalizeTradingEnv(credentials.tradingEnv);

  const hasSession = await hasKisApiSession();
  if (!hasSession) {
    return createKisApiErrorResponse({
      status: 401,
      code: KIS_API_ERROR_CODE.AUTH_REQUIRED,
      message: "로그인이 필요합니다.",
      tradingEnv,
    });
  }

  const invalidMessage = validateKisCredentialInput(credentials);
  if (invalidMessage) {
    return createKisApiErrorResponse({
      status: 400,
      code: KIS_API_ERROR_CODE.INVALID_REQUEST,
      message: invalidMessage,
      tradingEnv,
    });
  }

  try {
    await getKisAccessToken(credentials);

    return NextResponse.json({
      ok: true,
      tradingEnv,
      message: "API 키 검증이 완료되었습니다. (토큰 발급 성공)",
    } satisfies DashboardKisValidateResponse);
  } catch (error) {
    return createKisApiErrorResponse({
      status: 401,
      code: KIS_API_ERROR_CODE.UNAUTHORIZED,
      message: toKisApiErrorMessage(error, "API 키 검증 중 오류가 발생했습니다."),
      tradingEnv,
    });
  }
}