import type { KisRuntimeCredentials } from "@/features/settings/store/use-kis-runtime-store";
import {
  resolveKisApiErrorMessage,
  type KisApiErrorPayload,
} from "@/features/settings/apis/kis-api-utils";
import type {
  DashboardKisProfileValidateResponse,
  DashboardKisRevokeResponse,
  DashboardKisValidateResponse,
  DashboardKisWsApprovalResponse,
} from "@/features/trade/types/trade.types";

interface KisApiBaseResponse {
  ok: boolean;
  message: string;
}

async function postKisAuthApi<T extends KisApiBaseResponse>(
  endpoint: string,
  credentials: KisRuntimeCredentials,
  fallbackErrorMessage: string,
): Promise<T> {
  const response = await fetch(endpoint, {
    method: "POST",
    headers: {
      "content-type": "application/json",
    },
    body: JSON.stringify(credentials),
    cache: "no-store",
  });

  const payload = (await response.json()) as T | KisApiErrorPayload;

  if (!response.ok || !payload.ok) {
    throw new Error(resolveKisApiErrorMessage(payload, fallbackErrorMessage));
  }

  return payload as T;
}

/**
 * @description KIS API 키를 검증합니다.
 * @see app/api/kis/validate/route.ts
 */
export async function validateKisCredentials(
  credentials: KisRuntimeCredentials,
): Promise<DashboardKisValidateResponse> {
  return postKisAuthApi<DashboardKisValidateResponse>(
    "/api/kis/validate",
    credentials,
    "앱키 검증에 실패했습니다.",
  );
}

/**
 * @description KIS 액세스 토큰을 폐기합니다.
 * @see app/api/kis/revoke/route.ts
 */
export async function revokeKisCredentials(
  credentials: KisRuntimeCredentials,
): Promise<DashboardKisRevokeResponse> {
  return postKisAuthApi<DashboardKisRevokeResponse>(
    "/api/kis/revoke",
    credentials,
    "API 토큰 폐기에 실패했습니다.",
  );
}

/**
 * @description 웹소켓 승인키와 WS URL을 조회합니다.
 * @see app/api/kis/ws/approval/route.ts
 */
export async function fetchKisWebSocketApproval(
  credentials: KisRuntimeCredentials,
): Promise<DashboardKisWsApprovalResponse> {
  const payload = await postKisAuthApi<DashboardKisWsApprovalResponse>(
    "/api/kis/ws/approval",
    credentials,
    "웹소켓 승인키 발급에 실패했습니다.",
  );

  if (!payload.approvalKey || !payload.wsUrl) {
    throw new Error(payload.message || "웹소켓 연결 정보가 누락되었습니다.");
  }

  return payload;
}

/**
 * @description 계좌번호를 검증합니다.
 * @see app/api/kis/validate-profile/route.ts
 */
export async function validateKisProfile(
  credentials: KisRuntimeCredentials,
): Promise<DashboardKisProfileValidateResponse> {
  return postKisAuthApi<DashboardKisProfileValidateResponse>(
    "/api/kis/validate-profile",
    credentials,
    "계좌 검증에 실패했습니다.",
  );
}