"use client";

import type { ChartConfiguration } from "chart.js";
import clsx from "clsx";
import { useRouter } from "next/navigation";
import { useEffect, useMemo, useRef, useState } from "react";
import { ForecastTable } from "@/components/dashboard/PanelSections";
import { useChart } from "@/hooks/useChart";
import { useDashboardStore } from "@/hooks/useDashboardStore";
import { useI18n } from "@/hooks/useI18n";
import { getOfficialSourceLinks } from "@/lib/dashboard-official-sources";
import { CityDetail } from "@/lib/dashboard-types";
import { trackAppEvent } from "@/lib/app-analytics";
import { getTodayPolymarketUrl } from "@/lib/polymarket-market-links";
import {
  getCityProfileStats,
  getRiskBadgeLabel,
  getTemperatureChartData,
} from "@/lib/dashboard-utils";

function DetailMiniTemperatureChart({ detail }: { detail: CityDetail }) {
  const { locale, t } = useI18n();
  const chartData = useMemo(
    () => getTemperatureChartData(detail, locale),
    [detail, locale],
  );

  const canvasRef = useChart(() => {
    if (!chartData) {
      return {
        data: { datasets: [], labels: [] },
        type: "line",
      } satisfies ChartConfiguration<"line">;
    }

    const forecastPoints = chartData.datasets.hasMgmHourly
      ? chartData.datasets.mgmHourlyPoints
      : chartData.datasets.debPast.map(
          (value, index) => value ?? chartData.datasets.debFuture[index],
        );

    return {
      data: {
        datasets: [
          {
            borderColor: chartData.datasets.hasMgmHourly
              ? "rgba(250, 204, 21, 0.92)"
              : "rgba(52, 211, 153, 0.86)",
            borderWidth: 1.8,
            data: forecastPoints,
            fill: false,
            label: chartData.datasets.hasMgmHourly
              ? locale === "en-US"
                ? "MGM Forecast"
                : "MGM 预测"
              : locale === "en-US"
                ? "DEB Forecast"
                : "DEB 预测",
            pointRadius: 0,
            spanGaps: true,
            tension: 0.28,
          },
          {
            backgroundColor: "#22d3ee",
            borderColor: "#22d3ee",
            borderWidth: 0,
            data: chartData.datasets.metarPoints,
            fill: false,
            label:
              chartData.observationLabel ||
              (locale === "en-US" ? "METAR Observation" : "METAR 实况"),
            pointHoverRadius: 6,
            pointRadius: 3.8,
            showLine: false,
          },
        ],
        labels: chartData.times,
      },
      options: {
        interaction: { intersect: false, mode: "index" },
        maintainAspectRatio: false,
        plugins: {
          legend: { display: false },
          tooltip: {
            backgroundColor: "rgba(15, 23, 42, 0.95)",
            borderColor: "rgba(34, 211, 238, 0.25)",
            borderWidth: 1,
          },
        },
        responsive: true,
        scales: {
          x: {
            grid: { color: "rgba(255,255,255,0.03)" },
            ticks: {
              callback: (_value, index) =>
                typeof index === "number" && index % 4 === 0
                  ? chartData.times[index]
                  : "",
              color: "#64748b",
              font: { size: 10 },
              maxRotation: 0,
            },
          },
          y: {
            grid: { color: "rgba(255,255,255,0.03)" },
            max: chartData.max,
            min: chartData.min,
            ticks: {
              callback: (value) => `${value}${detail.temp_symbol || "°C"}`,
              color: "#64748b",
              font: { size: 10 },
            },
          },
        },
      },
      type: "line",
    } satisfies ChartConfiguration<"line">;
  }, [chartData, detail.temp_symbol, locale]);

  return (
    <div className="detail-mini-chart-wrap">
      <div className="detail-mini-chart">
        <canvas ref={canvasRef} />
      </div>
      <div className="detail-mini-meta">
        {chartData?.legendText || t("detail.chartLegendEmpty")}
      </div>
    </div>
  );
}

export function DetailPanel() {
  const store = useDashboardStore();
  const { locale, t } = useI18n();
  const router = useRouter();
  const detail = store.selectedDetail;
  const selectedCityItem = useMemo(
    () =>
      store.selectedCity
        ? store.cities.find((city) => city.name === store.selectedCity) || null
        : null,
    [store.cities, store.selectedCity],
  );
  const selectedSummary = useMemo(
    () =>
      store.selectedCity
        ? store.citySummariesByName[store.selectedCity] || null
        : null,
    [store.citySummariesByName, store.selectedCity],
  );
  const isPro = store.proAccess.subscriptionActive;
  const isAuthenticated = store.proAccess.authenticated;
  const panelRef = useRef<HTMLElement | null>(null);
  const [heavyContentReady, setHeavyContentReady] = useState(false);
  const isOverlayOpen = Boolean(store.futureModalDate) || store.historyState.isOpen;
  const isVisible = store.isPanelOpen && Boolean(store.selectedCity) && !isOverlayOpen;
  const hasBasicPanelContent = Boolean(detail || selectedSummary || selectedCityItem);
  const panelDisplayName =
    detail?.display_name ||
    selectedSummary?.display_name ||
    selectedCityItem?.display_name ||
    store.selectedCity ||
    "...";
  const panelRiskLevel =
    detail?.risk?.level ||
    selectedSummary?.risk?.level ||
    selectedCityItem?.risk_level ||
    "low";
  const profileStats = useMemo(
    () => (detail ? getCityProfileStats(detail, locale) : []),
    [detail, locale],
  );
  const officialLinks = useMemo(
    () => (detail ? getOfficialSourceLinks(detail) : []),
    [detail],
  );
  const marketUrl = useMemo(
    () => getTodayPolymarketUrl(detail, locale),
    [detail, locale],
  );
  const basicSettlementLabel =
    selectedSummary?.current?.settlement_source_label ||
    selectedCityItem?.settlement_source_label ||
    selectedCityItem?.settlement_source ||
    (locale === "en-US" ? "Settlement source pending" : "结算口径待确认");
  const basicAirportLabel =
    selectedCityItem?.airport ||
    selectedSummary?.icao ||
    (locale === "en-US" ? "Airport pending" : "机场待确认");
  const heroSettlementLabel =
    detail?.current?.settlement_source_label || basicSettlementLabel;
  const heroAirportLabel = detail?.risk?.airport || basicAirportLabel;
  const isSparsePanelDetail = Boolean(
    detail &&
      (detail.detail_depth !== "full" ||
        (detail.forecast?.daily?.length ?? 0) <= 1),
  );
  const isPanelSyncing = store.loadingState.cityDetail;
  const isShowingCachedDetailDuringSync = Boolean(detail && isPanelSyncing);

  const blurActiveElement = () => {
    if (typeof document === "undefined") return;
    const active = document.activeElement;
    if (active instanceof HTMLElement) {
      active.blur();
    }
  };

  const handleFeatureAccess = (feature: "today" | "history") => {
    blurActiveElement();

    if (!isPro) {
      trackAppEvent("paywall_feature_clicked", {
        entry: "detail_panel",
        feature,
        city: store.selectedCity,
        user_state: isAuthenticated ? "logged_in" : "guest",
      });
    }

    if (isPro) {
      if (feature === "today") {
        void store.openTodayModal();
        return;
      }
      void store.openHistory();
      return;
    }

    if (isAuthenticated) {
      router.push("/account");
      return;
    }

    if (feature === "today") {
      void store.openTodayModal();
      return;
    }
    void store.openHistory();
  };

  useEffect(() => {
    const panel = panelRef.current;
    if (!panel) return;

    if (!isVisible) {
      panel.setAttribute("inert", "");
      if (typeof document !== "undefined" && panel.contains(document.activeElement)) {
        const active = document.activeElement;
        if (active instanceof HTMLElement) {
          active.blur();
        }
      }
      return;
    }

    panel.removeAttribute("inert");
  }, [isVisible]);

  useEffect(() => {
    if (!isVisible || !detail) {
      setHeavyContentReady(false);
      return;
    }

    let canceled = false;
    let timeoutId: number | null = null;
    let idleId: number | null = null;
    const win = typeof window !== "undefined" ? (window as any) : null;

    const markReady = () => {
      if (!canceled) {
        setHeavyContentReady(true);
      }
    };

    if (win && typeof win.requestIdleCallback === "function") {
      idleId = win.requestIdleCallback(markReady, { timeout: 180 });
    } else if (typeof window !== "undefined") {
      timeoutId = window.setTimeout(markReady, 80);
    } else {
      setHeavyContentReady(true);
    }

    return () => {
      canceled = true;
      if (win && idleId != null && typeof win.cancelIdleCallback === "function") {
        win.cancelIdleCallback(idleId);
      }
      if (timeoutId != null && typeof window !== "undefined") {
        window.clearTimeout(timeoutId);
      }
    };
  }, [detail, isVisible]);

  return (
    <aside ref={panelRef} className={clsx("detail-panel", isVisible && "visible")}>
      <div className="panel-header">
        <button
          type="button"
          className="panel-close"
          aria-label={t("detail.closeAria")}
          onClick={() => {
            blurActiveElement();
            store.closePanel();
          }}
        >
          ×
        </button>
          <div className="panel-title-area">
          <div className="panel-title-stack">
            <div className="panel-overline">
              <span>{locale === "en-US" ? "City briefing" : "城市简报"}</span>
              <span className="panel-overline-sep">•</span>
              <span>{panelDisplayName.toUpperCase()}</span>
            </div>
            <h2>{panelDisplayName}</h2>
          </div>
          {isPanelSyncing && (
            <div className="panel-loading-hint" role="status" aria-live="polite">
              <span className="panel-loading-spinner" aria-hidden="true" />
              <span>
                {locale === "en-US"
                  ? isSparsePanelDetail
                    ? `Completing ${panelDisplayName} cards...`
                    : `Syncing ${panelDisplayName}...`
                  : isSparsePanelDetail
                    ? `正在补齐 ${panelDisplayName} 卡片...`
                    : `正在同步 ${panelDisplayName}...`}
              </span>
            </div>
          )}
          <div className="panel-meta">
            <span className={clsx("risk-badge", panelRiskLevel)}>
              {getRiskBadgeLabel(panelRiskLevel, locale)}
            </span>
            <span className="panel-meta-chip panel-meta-chip-strong">{heroSettlementLabel}</span>
            <span className="panel-meta-chip panel-meta-chip-muted">{heroAirportLabel}</span>
          </div>
          <div className="panel-actions">
            {marketUrl ? (
              <a
                className="panel-action-button panel-action-button-ghost"
                href={marketUrl}
                target="_blank"
                rel="noreferrer"
                title={
                  locale === "en-US"
                    ? "Open today's Polymarket market"
                    : "打开今日 Polymarket 题目页"
                }
              >
                {locale === "en-US" ? "Market" : "市场页"}
              </a>
            ) : null}
            <button
              type="button"
              className={clsx(
                "panel-action-button",
                "panel-action-button-primary",
                !isPro && "pro-locked",
              )}
              title={
                isPro ? t("detail.todayAnalysis") : `${t("detail.todayAnalysis")} (Pro)`
              }
              onClick={() => handleFeatureAccess("today")}
              disabled={!store.selectedCity}
            >
              {isPro ? t("detail.todayAnalysis") : `${t("detail.todayAnalysis")} · Pro`}
            </button>
            <button
              type="button"
              className={clsx(
                "panel-action-button",
                "panel-action-button-secondary",
                !isPro && "pro-locked",
              )}
              title={isPro ? t("detail.history") : `${t("detail.history")} (Pro)`}
              onClick={() => handleFeatureAccess("history")}
              disabled={!store.selectedCity}
            >
              {isPro ? t("detail.history") : `${t("detail.history")} · Pro`}
            </button>
          </div>
        </div>
      </div>

      <div className={clsx("panel-body", isShowingCachedDetailDuringSync && "is-syncing")}>
        {isShowingCachedDetailDuringSync ? (
          <div className="panel-sync-blocker" role="status" aria-live="polite">
            <span className="panel-loading-spinner" aria-hidden="true" />
            <span>
              {locale === "en-US"
                ? `Refreshing ${panelDisplayName}. Current cards are paused until the latest data arrives.`
                : `正在刷新 ${panelDisplayName}，最新数据返回前暂停展示旧卡片。`}
            </span>
          </div>
        ) : null}
        <div className={clsx(isShowingCachedDetailDuringSync && "panel-content-stale")}>
        {!hasBasicPanelContent ? (
          <section className="detail-summary-shell detail-empty-state">
            <div className="detail-section-head">
              <div>
                <div className="detail-section-kicker">
                  {locale === "en-US" ? "No city selected" : "尚未选择城市"}
                </div>
                <h3>{locale === "en-US" ? "Pick a city to start." : "先选择一个城市。"}</h3>
              </div>
            </div>
            <div style={{ color: "var(--text-muted)", fontSize: "13px" }}>
              {store.loadingState.cityDetail ? t("detail.loading") : t("detail.emptyHint")}
            </div>
          </section>
        ) : !detail ? (
          <div className="detail-mini-meta" role="status" aria-live="polite">
            {store.loadingState.cityDetail
              ? locale === "en-US"
                ? "Loading city cards..."
                : "正在加载城市卡片..."
              : locale === "en-US"
                ? "City cards will appear here."
                : "城市卡片会显示在这里。"}
          </div>
        ) : (
          <>
            <section className="detail-structured-section">
              <div className="detail-section-head">
                <div>
                  <div className="detail-section-kicker">{locale === "en-US" ? "Profile" : "城市画像"}</div>
                  <h3>{t("detail.profile")}</h3>
                </div>
              </div>
              <div className="detail-grid">
                {profileStats.map((item) => (
                  <article key={item.label} className="detail-card">
                    <span className="detail-label">{item.label}</span>
                    <span className="detail-value">{item.value}</span>
                  </article>
                ))}
              </div>
            </section>

            {officialLinks.length > 0 ? (
              <section className="detail-structured-section">
                <div className="detail-section-head">
                  <div>
                    <div className="detail-section-kicker">
                      {locale === "en-US" ? "Primary references" : "官方参考"}
                    </div>
                    <h3>{locale === "en-US" ? "Settlement and observation references" : "结算与观测参考来源"}</h3>
                  </div>
                </div>
                <p className="detail-source-note">
                  {locale === "en-US"
                    ? "AGENCY = national meteorological service, METAR = airport observation, AIRPORT = airport official page."
                    : "AGENCY = 国家气象机构，METAR = 机场实测报文，AIRPORT = 机场官网页面。"}
                </p>
                <div className="detail-source-list">
                  {officialLinks.map((link) => (
                    <a
                      key={`${link.label}-${link.href}`}
                      className="detail-source-link"
                      href={link.href}
                      target="_blank"
                      rel="noreferrer"
                    >
                      <span className="detail-source-kind">{link.kind.toUpperCase()}</span>
                      <span className="detail-source-label">{link.label}</span>
                    </a>
                  ))}
                </div>
              </section>
            ) : null}

            <section className="detail-structured-section rounded-2xl">
              <div className="detail-section-head">
                <div>
                  <div className="detail-section-kicker">
                    {locale === "en-US" ? "Mini trend" : "温度微趋势"}
                  </div>
                  <h3>{t("detail.todayMiniTrend")}</h3>
                </div>
              </div>
              {heavyContentReady ? (
                <DetailMiniTemperatureChart detail={detail} />
              ) : (
                <div className="detail-mini-meta">{t("detail.loading")}</div>
              )}
            </section>

            {heavyContentReady ? <ForecastTable /> : null}
          </>
        )}
        </div>
      </div>
    </aside>
  );
}