"use client";

import Link from "next/link";
import { useEffect, useMemo, useState } from "react";
import { AlertsPanel } from "../../components/AlertsPanel";
import { CompositeScoreCard } from "../../components/CompositeScoreCard";
import { DisclosuresPanel } from "../../components/DisclosuresPanel";
import { InvestorCumulative } from "../../components/InvestorCumulative";
import { MetricsPanel } from "../../components/MetricsPanel";
import { PeerComparePanel } from "../../components/PeerComparePanel";
import { NewsList } from "../../components/NewsList";
import { OrderbookPanel } from "../../components/OrderbookPanel";
import { PeriodReturns } from "../../components/PeriodReturns";
import { PeriodTabs, periodSpec, type Period } from "../../components/PeriodTabs";
import { PredictionPanel } from "../../components/PredictionPanel";
import { PriceHero } from "../../components/PriceHero";
import { RelatedStocks } from "../../components/RelatedStocks";
import { StarButton } from "../../components/StarButton";
import { StockChart } from "../../components/StockChart";
import { SymbolSidebar } from "../../components/SymbolSidebar";
import { TradingValuePanel } from "../../components/TradingValuePanel";
import { api, type ChartPayload, type LatestPredictionResponse } from "../../lib/api";
import { recent } from "../../lib/recent";
import { shouldRecordView } from "../../lib/views";

export default function CodePage({ params }: { params: { code: string } }) {
  const { code } = params;
  const [chart, setChart] = useState<ChartPayload | null>(null);
  const [prediction, setPrediction] = useState<LatestPredictionResponse | null>(null);
  const [err, setErr] = useState<string | null>(null);
  const [period, setPeriod] = useState<Period>("3M");
  const [viewsToday, setViewsToday] = useState<number | null>(null);

  const spec = periodSpec(period);
  const isIntraday = spec.interval === "10m";

  // 종목 페이지 방문 시 최근 본 종목에 push.
  useEffect(() => {
    recent.push(code);
  }, [code]);

  // 조회 카운터.
  //   - 같은 (code, KST today) 는 localStorage 마크로 dedupe → POST 1회.
  //   - dedupe 실패 (스토리지 잠금 등) 해도 GET 으로 today_views 는 조회.
  //   - POST 응답이 today_views 를 주므로 별도 GET 안 해도 됨 (한 라운드트립으로 끝).
  //   - 이미 봤던 종목이면 GET 만.
  useEffect(() => {
    let alive = true;
    const apply = (n: number) => {
      if (alive) setViewsToday(n);
    };
    if (shouldRecordView(code)) {
      api.recordView(code).then((r) => apply(r.today_views)).catch(() => {
        // POST 실패 시 GET 한 번 시도 (혹시 다른 사용자 카운트라도 보여줌).
        api.views(code).then((r) => apply(r.today_views)).catch(() => {});
      });
    } else {
      api.views(code).then((r) => apply(r.today_views)).catch(() => {});
    }
    return () => {
      alive = false;
    };
  }, [code]);

  useEffect(() => {
    let alive = true;
    setErr(null);
    setChart(null);

    const load = () => {
      api
        .getChart(code, spec.days, spec.interval)
        .then((c) => {
          if (alive) setChart(c);
        })
        .catch((e) => {
          if (alive) setErr(e instanceof Error ? e.message : String(e));
        });
    };
    load();

    // 1일(10분봉) 모드만 60s 폴링 — 백엔드가 10분 내면 DB 만 읽음.
    if (isIntraday) {
      const h = window.setInterval(load, 60_000);
      return () => {
        alive = false;
        window.clearInterval(h);
      };
    }
    return () => {
      alive = false;
    };
  }, [code, spec.days, spec.interval, isIntraday]);

  useEffect(() => {
    let alive = true;
    api
      .latestPrediction(code)
      .then((r) => {
        if (alive && r.found) setPrediction(r);
      })
      .catch(() => {
        // 예측 이력 없음 — 무시
      });
    return () => {
      alive = false;
    };
  }, [code]);

  // 현재가/전일가 + 헤더 sparkline 시리즈 — ohlcv 끝부분에서 산출.
  const { current, prev, asOf, sparkSeries } = useMemo(() => {
    if (!chart || !chart.ohlcv.length)
      return { current: null, prev: null, asOf: null, sparkSeries: [] as number[] };
    const valid = chart.ohlcv.filter((p) => p.close != null);
    if (!valid.length)
      return { current: null, prev: null, asOf: null, sparkSeries: [] as number[] };
    const last = valid[valid.length - 1];
    const prevPt = valid.length >= 2 ? valid[valid.length - 2] : null;
    // 최근 30개 종가 (없으면 가용 전체).
    const recent = valid.slice(-30).map((p) => p.close as number);
    return {
      current: last.close,
      prev: prevPt?.close ?? null,
      asOf: last.date,
      sparkSeries: recent,
    };
  }, [chart]);

  return (
    <main className="mx-auto max-w-5xl px-6 py-8">
      <div className="mb-4 flex items-center justify-between gap-3">
        <div className="flex items-center gap-3">
          <Link href="/" className="text-xs text-zinc-500 hover:text-zinc-300">
            ← 검색
          </Link>
          <Link
            href="/watchlist"
            className="text-xs text-zinc-500 hover:text-zinc-300"
          >
            관심종목
          </Link>
        </div>
        <div className="flex items-center gap-3">
          <Link
            href={`/compare?codes=${code}`}
            className="rounded-md border border-zinc-700 px-2 py-0.5 text-[11px] text-zinc-400 hover:border-zinc-500 hover:text-zinc-200"
            title="이 종목으로 비교 시작"
          >
            ⇄ 비교
          </Link>
          <StarButton code={code} name={chart?.name} />
          <PeriodTabs value={period} onChange={(id) => setPeriod(id)} />
        </div>
      </div>

      {err && <div className="mb-4 text-sm text-red-400">차트 로딩 실패: {err}</div>}

      {chart && (
        <>
          <PriceHero
            name={chart.name}
            code={chart.code}
            market={chart.market}
            current={current}
            prev={prev}
            asOf={asOf}
            series={sparkSeries}
            viewsToday={viewsToday}
          />
          <div className="grid gap-6 lg:grid-cols-[1fr_280px]">
            <div>
              <StockChart chart={chart} prediction={prediction} />
              {isIntraday && chart.intraday_status && (
                <div className="mt-2 text-right text-[11px] text-zinc-500">
                  실시간 10분봉 · 60초 갱신 · [{chart.intraday_status}]
                </div>
              )}
              <div className="mt-6">
                <PredictionPanel code={code} initial={prediction} onResult={setPrediction} />
              </div>
            </div>
            <div className="space-y-4">
              <SymbolSidebar code={code} />
              <OrderbookPanel code={code} />
              <AlertsPanel code={code} name={chart?.name} current={current} />
              <RelatedStocks code={code} />
            </div>
          </div>
          <div className="mt-6">
            <CompositeScoreCard chart={chart} />
          </div>
          <div className="mt-6">
            <PeriodReturns ohlcv={chart.ohlcv} />
          </div>
          <div className="mt-6">
            <PeerComparePanel code={code} />
          </div>
          <div className="mt-6 grid gap-6 md:grid-cols-2">
            <TradingValuePanel data={chart.trading_value} />
            <InvestorCumulative data={chart.trading_value} />
          </div>
          <div className="mt-6">
            <MetricsPanel code={code} />
          </div>
          <div className="mt-6 grid gap-6 md:grid-cols-2">
            <NewsList code={code} />
            <DisclosuresPanel code={code} />
          </div>
        </>
      )}
    </main>
  );
}
