"use client";

import Link from "next/link";
import { useEffect, useState } from "react";
import { MetricsPanel } from "../../components/MetricsPanel";
import { NewsList } from "../../components/NewsList";
import { PredictionPanel } from "../../components/PredictionPanel";
import { StockChart } from "../../components/StockChart";
import {
  api,
  type ChartInterval,
  type ChartPayload,
  type LatestPredictionResponse,
} from "../../lib/api";

const INTERVALS: { label: string; value: ChartInterval; defaultDays: number }[] = [
  { label: "10분", value: "10m", defaultDays: 1 },
  { label: "일", value: "1d", defaultDays: 180 },
  { label: "주", value: "1w", defaultDays: 365 * 2 },
  { label: "월", value: "1mo", defaultDays: 365 * 5 },
];

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 [interval, setIntervalKind] = useState<ChartInterval>("1d");
  const [days, setDays] = useState(180);

  // interval 바꾸면 days 도 그 interval 에 맞는 기본값으로 (사용자가 명시적으로 다시 고를 수 있게).
  function pickInterval(v: ChartInterval) {
    const meta = INTERVALS.find((i) => i.value === v)!;
    setIntervalKind(v);
    setDays(meta.defaultDays);
  }

  // 초기/주기적 차트 로드. 10분봉이면 60초마다 폴링 — 백엔드가 캐시-then-fetch 로
  // 10분 이내면 DB 만 읽고, 넘었으면 KIS 호출. 폴링 부담은 낮음.
  useEffect(() => {
    let alive = true;
    setErr(null);
    setChart(null);

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

    if (interval === "10m") {
      const h = window.setInterval(load, 60_000);
      return () => {
        alive = false;
        window.clearInterval(h);
      };
    }
    return () => {
      alive = false;
    };
  }, [code, days, interval]);

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

  return (
    <main className="mx-auto max-w-5xl px-6 py-10">
      <div className="mb-4 flex items-center justify-between">
        <Link href="/" className="text-xs text-zinc-500 hover:text-zinc-300">
          ← 검색으로
        </Link>
        <div className="flex items-center gap-2">
          <div className="flex overflow-hidden rounded-md border border-zinc-700 text-xs">
            {INTERVALS.map((it) => (
              <button
                key={it.value}
                onClick={() => pickInterval(it.value)}
                className={
                  interval === it.value
                    ? "bg-emerald-700 px-3 py-1 text-white"
                    : "bg-zinc-900 px-3 py-1 text-zinc-300 hover:bg-zinc-800"
                }
              >
                {it.label}
              </button>
            ))}
          </div>
          {interval !== "10m" && (
            <select
              value={days}
              onChange={(e) => setDays(Number(e.target.value))}
              className="rounded-md border border-zinc-700 bg-zinc-900 px-2 py-1 text-xs"
            >
              <option value={60}>최근 3개월</option>
              <option value={180}>최근 6개월</option>
              <option value={365}>최근 1년</option>
              <option value={365 * 2}>최근 2년</option>
              <option value={365 * 5}>최근 5년</option>
              <option value={365 * 10}>최근 10년</option>
            </select>
          )}
        </div>
      </div>

      {chart && (
        <div className="mb-4 flex items-baseline justify-between">
          <h1 className="text-2xl font-semibold text-zinc-100">
            {chart.name}{" "}
            <span className="text-sm font-normal text-zinc-500">
              {chart.code} · {chart.market}
            </span>
          </h1>
          {interval === "10m" && (
            <div className="text-xs text-zinc-500">
              실시간 10분봉 · 60초마다 갱신
              {chart.intraday_status && (
                <span className="ml-2 text-zinc-600">[{chart.intraday_status}]</span>
              )}
            </div>
          )}
        </div>
      )}

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

      {chart && (
        <>
          <StockChart chart={chart} prediction={prediction} />
          <div className="mt-6">
            <PredictionPanel code={code} initial={prediction} onResult={setPrediction} />
          </div>
          <div className="mt-6 grid gap-6 md:grid-cols-2">
            <MetricsPanel code={code} />
            <NewsList code={code} />
          </div>
        </>
      )}
    </main>
  );
}