/**
 * @file lib/kis/dashboard.ts
 * @description 대시보드 전용 KIS 잔고/지수 데이터 어댑터
 */

import { KOREAN_STOCK_INDEX } from "@/features/trade/data/korean-stocks";
import { kisGet } from "@/lib/kis/client";
import type { KisCredentialInput } from "@/lib/kis/config";
import { normalizeTradingEnv } from "@/lib/kis/config";
import type { KisAccountParts } from "@/lib/kis/account";

interface KisBalanceOutput1Row {
  pdno?: string;
  prdt_name?: string;
  hldg_qty?: string;
  pchs_avg_pric?: string;
  prpr?: string;
  evlu_amt?: string;
  evlu_pfls_amt?: string;
  evlu_pfls_rt?: string;
}

interface KisBalanceOutput2Row {
  dnca_tot_amt?: string;
  tot_evlu_amt?: string;
  scts_evlu_amt?: string;
  evlu_amt_smtl_amt?: string;
  evlu_pfls_smtl_amt?: string;
  asst_icdc_erng_rt?: string;
}

interface KisIndexOutputRow {
  bstp_nmix_prpr?: string;
  bstp_nmix_prdy_vrss?: string;
  bstp_nmix_prdy_ctrt?: string;
  prdy_vrss_sign?: string;
}

export interface DomesticBalanceSummary {
  totalAmount: number;
  cashBalance: number;
  totalProfitLoss: number;
  totalProfitRate: number;
}

export interface DomesticHoldingItem {
  symbol: string;
  name: string;
  market: "KOSPI" | "KOSDAQ";
  quantity: number;
  averagePrice: number;
  currentPrice: number;
  evaluationAmount: number;
  profitLoss: number;
  profitRate: number;
}

export interface DomesticBalanceResult {
  summary: DomesticBalanceSummary;
  holdings: DomesticHoldingItem[];
}

export interface DomesticMarketIndexResult {
  market: "KOSPI" | "KOSDAQ";
  code: string;
  name: string;
  price: number;
  change: number;
  changeRate: number;
}

const MARKET_BY_SYMBOL = new Map(
  KOREAN_STOCK_INDEX.map((item) => [item.symbol, item.market] as const),
);

const INDEX_TARGETS: Array<{
  market: "KOSPI" | "KOSDAQ";
  code: string;
  name: string;
}> = [
  { market: "KOSPI", code: "0001", name: "코스피" },
  { market: "KOSDAQ", code: "1001", name: "코스닥" },
];

/**
 * KIS 잔고조회 API를 호출해 대시보드 모델로 변환합니다.
 * @param account KIS 계좌번호(8-2) 파트
 * @param credentials 사용자 입력 키(선택)
 * @returns 대시보드 요약/보유종목 모델
 * @see app/api/kis/domestic/balance/route.ts 대시보드 잔고 API 응답 생성
 */
export async function getDomesticDashboardBalance(
  account: KisAccountParts,
  credentials?: KisCredentialInput,
): Promise<DomesticBalanceResult> {
  const trId =
    normalizeTradingEnv(credentials?.tradingEnv) === "real"
      ? "TTTC8434R"
      : "VTTC8434R";

  const response = await kisGet<unknown>(
    "/uapi/domestic-stock/v1/trading/inquire-balance",
    trId,
    {
      CANO: account.accountNo,
      ACNT_PRDT_CD: account.accountProductCode,
      AFHR_FLPR_YN: "N",
      OFL_YN: "",
      INQR_DVSN: "02",
      UNPR_DVSN: "01",
      FUND_STTL_ICLD_YN: "N",
      FNCG_AMT_AUTO_RDPT_YN: "N",
      PRCS_DVSN: "00",
      CTX_AREA_FK100: "",
      CTX_AREA_NK100: "",
    },
    credentials,
  );

  const holdingRows = parseRows<KisBalanceOutput1Row>(response.output1);
  const summaryRow = parseFirstRow<KisBalanceOutput2Row>(response.output2);

  const holdings = holdingRows
    .map((row) => {
      const symbol = (row.pdno ?? "").trim();
      if (!/^\d{6}$/.test(symbol)) return null;

      return {
        symbol,
        name: (row.prdt_name ?? "").trim() || symbol,
        market: MARKET_BY_SYMBOL.get(symbol) ?? "KOSPI",
        quantity: toNumber(row.hldg_qty),
        averagePrice: toNumber(row.pchs_avg_pric),
        currentPrice: toNumber(row.prpr),
        evaluationAmount: toNumber(row.evlu_amt),
        profitLoss: toNumber(row.evlu_pfls_amt),
        profitRate: toNumber(row.evlu_pfls_rt),
      } satisfies DomesticHoldingItem;
    })
    .filter((item): item is DomesticHoldingItem => Boolean(item));

  const cashBalance = toNumber(summaryRow?.dnca_tot_amt);
  const holdingsEvalAmount = sumNumbers(holdings.map((item) => item.evaluationAmount));
  const stockEvalAmount = firstPositiveNumber(
    toNumber(summaryRow?.scts_evlu_amt),
    toNumber(summaryRow?.evlu_amt_smtl_amt),
    holdingsEvalAmount,
  );
  const totalAmount = firstPositiveNumber(
    stockEvalAmount + cashBalance,
    toNumber(summaryRow?.tot_evlu_amt),
    holdingsEvalAmount + cashBalance,
  );
  const totalProfitLoss = firstDefinedNumber(
    toOptionalNumber(summaryRow?.evlu_pfls_smtl_amt),
    sumNumbers(holdings.map((item) => item.profitLoss)),
  );
  const totalProfitRate = firstDefinedNumber(
    toOptionalNumber(summaryRow?.asst_icdc_erng_rt),
    calcProfitRate(totalProfitLoss, totalAmount),
  );

  return {
    summary: {
      totalAmount,
      cashBalance,
      totalProfitLoss,
      totalProfitRate,
    },
    holdings,
  };
}

/**
 * KOSPI/KOSDAQ 지수를 조회해 대시보드 모델로 변환합니다.
 * @param credentials 사용자 입력 키(선택)
 * @returns 지수 목록(코스피/코스닥)
 * @see app/api/kis/domestic/indices/route.ts 대시보드 지수 API 응답 생성
 */
export async function getDomesticDashboardIndices(
  credentials?: KisCredentialInput,
): Promise<DomesticMarketIndexResult[]> {
  const results = await Promise.all(
    INDEX_TARGETS.map(async (target) => {
      const response = await kisGet<KisIndexOutputRow>(
        "/uapi/domestic-stock/v1/quotations/inquire-index-price",
        "FHPUP02100000",
        {
          FID_COND_MRKT_DIV_CODE: "U",
          FID_INPUT_ISCD: target.code,
        },
        credentials,
      );

      const row = parseIndexRow(response.output);
      const rawChange = toNumber(row.bstp_nmix_prdy_vrss);
      const rawChangeRate = toNumber(row.bstp_nmix_prdy_ctrt);

      return {
        market: target.market,
        code: target.code,
        name: target.name,
        price: toNumber(row.bstp_nmix_prpr),
        change: normalizeSignedValue(rawChange, row.prdy_vrss_sign),
        changeRate: normalizeSignedValue(rawChangeRate, row.prdy_vrss_sign),
      } satisfies DomesticMarketIndexResult;
    }),
  );

  return results;
}

/**
 * 문자열 숫자를 number로 변환합니다.
 * @param value KIS 숫자 문자열
 * @returns 파싱된 숫자(실패 시 0)
 * @see lib/kis/dashboard.ts 잔고/지수 필드 공통 파싱
 */
function toNumber(value?: string) {
  if (!value) return 0;
  const normalized = value.replaceAll(",", "").trim();
  if (!normalized) return 0;
  const parsed = Number(normalized);
  return Number.isFinite(parsed) ? parsed : 0;
}

/**
 * 문자열 숫자를 number로 변환하되 0도 유효값으로 유지합니다.
 * @param value KIS 숫자 문자열
 * @returns 파싱된 숫자 또는 undefined
 * @see lib/kis/dashboard.ts 요약값 폴백 순서 계산
 */
function toOptionalNumber(value?: string) {
  if (!value) return undefined;
  const normalized = value.replaceAll(",", "").trim();
  if (!normalized) return undefined;
  const parsed = Number(normalized);
  return Number.isFinite(parsed) ? parsed : undefined;
}

/**
 * output 계열 데이터를 배열 형태로 변환합니다.
 * @param value KIS output 값
 * @returns 레코드 배열
 * @see lib/kis/dashboard.ts 잔고 output1/output2 파싱
 */
function parseRows<T>(value: unknown): T[] {
  if (Array.isArray(value)) return value as T[];
  if (value && typeof value === "object") return [value as T];
  return [];
}

/**
 * output 계열 데이터의 첫 행을 반환합니다.
 * @param value KIS output 값
 * @returns 첫 번째 레코드
 * @see lib/kis/dashboard.ts 잔고 요약(output2) 파싱
 */
function parseFirstRow<T>(value: unknown) {
  const rows = parseRows<T>(value);
  return rows[0];
}

/**
 * 지수 output을 단일 레코드로 정규화합니다.
 * @param output KIS output
 * @returns 지수 레코드
 * @see lib/kis/dashboard.ts getDomesticDashboardIndices
 */
function parseIndexRow(output: unknown): KisIndexOutputRow {
  if (Array.isArray(output) && output[0] && typeof output[0] === "object") {
    return output[0] as KisIndexOutputRow;
  }
  if (output && typeof output === "object") {
    return output as KisIndexOutputRow;
  }
  return {};
}

/**
 * KIS 부호 코드(1/2 상승, 4/5 하락)를 실제 부호로 반영합니다.
 * @param value 변동값
 * @param signCode 부호 코드
 * @returns 부호 적용 숫자
 * @see lib/kis/dashboard.ts getDomesticDashboardIndices
 */
function normalizeSignedValue(value: number, signCode?: string) {
  const abs = Math.abs(value);
  if (signCode === "4" || signCode === "5") return -abs;
  if (signCode === "1" || signCode === "2") return abs;
  return value;
}

/**
 * 양수 우선값을 반환합니다.
 * @param values 후보 숫자 목록
 * @returns 첫 번째 양수, 없으면 0
 * @see lib/kis/dashboard.ts 요약 금액 폴백 계산
 */
function firstPositiveNumber(...values: number[]) {
  return values.find((value) => value > 0) ?? 0;
}

/**
 * undefined가 아닌 첫 값을 반환합니다.
 * @param values 후보 숫자 목록
 * @returns 첫 번째 유효값, 없으면 0
 * @see lib/kis/dashboard.ts 요약 수익률/손익 폴백 계산
 */
function firstDefinedNumber(...values: Array<number | undefined>) {
  return values.find((value) => value !== undefined) ?? 0;
}

/**
 * 숫자 배열 합계를 계산합니다.
 * @param values 숫자 배열
 * @returns 합계
 * @see lib/kis/dashboard.ts 보유종목 합계 계산
 */
function sumNumbers(values: number[]) {
  return values.reduce((total, value) => total + value, 0);
}

/**
 * 총자산 대비 손익률을 계산합니다.
 * @param profit 손익 금액
 * @param totalAmount 총자산 금액
 * @returns 손익률(%)
 * @see lib/kis/dashboard.ts 요약 수익률 폴백 계산
 */
function calcProfitRate(profit: number, totalAmount: number) {
  if (totalAmount <= 0) return 0;
  const baseAmount = totalAmount - profit;
  if (baseAmount <= 0) return 0;
  return (profit / baseAmount) * 100;
}