import { useEffect, useMemo, useState } from "react";
import {
  Activity,
  AlertTriangle,
  Globe2,
  Loader2,
  Shield,
  ShieldAlert,
  TrendingUp,
} from "lucide-react";
import {
  getLiveFeed,
  getLiveStats,
  type LiveItem,
  type LiveStatsResponse,
} from "@/lib/rasad-api";

const RISK_ORDER = ["verified", "suspicious", "risky", "neutral"] as const;
type Risk = (typeof RISK_ORDER)[number];

const RISK_TONES: Record<Risk, string> = {
  verified: "hsl(var(--verified))",
  suspicious: "hsl(var(--warning))",
  risky: "hsl(var(--primary))",
  neutral: "hsl(var(--muted-foreground))",
};
const RISK_LABEL: Record<Risk, string> = {
  verified: "موثوق",
  suspicious: "مشكوك",
  risky: "خطر",
  neutral: "قيد التصنيف",
};
const RISK_ICON: Record<Risk, typeof Shield> = {
  verified: Shield,
  suspicious: AlertTriangle,
  risky: ShieldAlert,
  neutral: Loader2,
};

interface Props {
  stats: LiveStatsResponse | null;
}

/**
 * Self-refreshing live-page visualization panel.
 *  - Real donut of risk distribution (graceful when mostly neutral).
 *  - Top sources with real counts + activity bars.
 *  - Pulse stats showing the live cycle counts.
 *  - Marquee of latest headlines from /api/v1/live/feed.
 */
export const LiveVisualPanel = ({ stats: statsProp }: Props) => {
  const [stats, setStats] = useState<LiveStatsResponse | null>(statsProp);
  const [tickerItems, setTickerItems] = useState<LiveItem[]>([]);

  // Sync with parent prop AND fetch independently so the panel always has data.
  useEffect(() => {
    if (statsProp) setStats(statsProp);
  }, [statsProp]);

  useEffect(() => {
    let cancelled = false;
    const tick = async () => {
      try {
        const [s, data] = await Promise.all([getLiveStats(), getLiveFeed({ limit: 12 })]);
        if (cancelled) return;
        setStats(s);
        setTickerItems(data.items);
      } catch {
        /* noop */
      }
    };
    tick();
    const t = window.setInterval(tick, 15000);
    return () => {
      cancelled = true;
      window.clearInterval(t);
    };
  }, []);

  // Normalize counts — ensure every risk key has a number so the donut always
  // renders the full ring (the legacy data only returned populated keys).
  const counts = useMemo(() => {
    const out: Record<Risk, number> = { verified: 0, suspicious: 0, risky: 0, neutral: 0 };
    for (const k of RISK_ORDER) out[k] = stats?.by_risk?.[k] ?? 0;
    return out;
  }, [stats?.by_risk]);

  const total = useMemo(() => counts.verified + counts.suspicious + counts.risky + counts.neutral, [
    counts,
  ]);

  // Classified = anything that isn't still "neutral" / pending.
  const classified = counts.verified + counts.suspicious + counts.risky;
  const danger = counts.suspicious + counts.risky;
  const dangerPctOfClassified = classified > 0 ? Math.round((danger / classified) * 100) : 0;

  const sourceEntries = useMemo(
    () =>
      Object.entries(stats?.by_source ?? {})
        .sort((a, b) => b[1] - a[1])
        .slice(0, 6),
    [stats?.by_source],
  );
  const sourceMax = sourceEntries[0]?.[1] || 1;

  return (
    <div className="grid gap-4 lg:grid-cols-12">
      {/* RISK DONUT */}
      <div className="surface-card relative overflow-hidden rounded-2xl p-5 lg:col-span-4">
        <div className="mb-3 flex items-center justify-between">
          <h3 className="text-sm font-bold text-foreground">توزيع المخاطر</h3>
          <span className="mono text-[10px] uppercase tracking-widest text-muted-foreground">
            {total} عنصر
          </span>
        </div>

        <RiskDonut counts={counts} total={total} centerValue={danger} classified={classified} dangerPctOfClassified={dangerPctOfClassified} />

        <ul className="mt-4 space-y-1.5">
          {RISK_ORDER.map((k) => {
            const v = counts[k];
            const pct = total > 0 ? Math.round((v / total) * 100) : 0;
            const Icon = RISK_ICON[k];
            return (
              <li
                key={k}
                className="flex items-center justify-between rounded-md border border-border px-2.5 py-1.5 text-[11px]"
                style={{ background: "hsl(var(--surface-elev-2))" }}
              >
                <span className="inline-flex items-center gap-2">
                  <Icon
                    className={`h-3 w-3 ${k === "neutral" ? "animate-spin-slow" : ""}`}
                    style={{ color: RISK_TONES[k] }}
                  />
                  <span className="font-semibold text-foreground/90">{RISK_LABEL[k]}</span>
                </span>
                <span className="flex items-center gap-2">
                  <span className="mono text-[10px] text-muted-foreground">{v}</span>
                  <span className="mono w-9 text-end font-bold" style={{ color: RISK_TONES[k] }}>
                    {pct}%
                  </span>
                </span>
              </li>
            );
          })}
        </ul>
      </div>

      {/* TOP SOURCES */}
      <div className="surface-card relative overflow-hidden rounded-2xl p-5 lg:col-span-5">
        <div className="mb-3 flex items-center justify-between">
          <h3 className="inline-flex items-center gap-2 text-sm font-bold text-foreground">
            <Globe2 className="h-4 w-4 text-primary" />
            أكثر المصادر نشاطاً
          </h3>
          <span className="mono text-[10px] uppercase tracking-widest text-muted-foreground">
            آخر تحديث
          </span>
        </div>
        <ul className="space-y-2.5">
          {sourceEntries.length === 0 && (
            <li className="rounded-lg border border-dashed border-border p-4 text-center text-xs text-muted-foreground">
              لم تصل بيانات بعد — البث المباشر يبدأ خلال دقائق.
            </li>
          )}
          {sourceEntries.map(([name, count], idx) => {
            const pct = Math.round((count / sourceMax) * 100);
            return (
              <li key={name} className="space-y-1">
                <div className="flex items-center justify-between text-[11px]">
                  <span className="inline-flex items-center gap-1.5 font-semibold text-foreground/90">
                    <span className="mono w-5 text-[9px] text-muted-foreground">
                      {String(idx + 1).padStart(2, "0")}
                    </span>
                    {name}
                  </span>
                  <span className="mono font-bold text-primary">{count}</span>
                </div>
                <div
                  className="relative h-1.5 overflow-hidden rounded-full"
                  style={{ background: "hsl(var(--surface-elev-2))" }}
                >
                  <div
                    className="meter-bar absolute inset-y-0 right-0 rounded-full"
                    style={{
                      ["--fill" as never]: `${Math.max(4, pct)}%`,
                      width: `${Math.max(4, pct)}%`,
                      background: `linear-gradient(90deg, hsl(var(--primary)), hsl(var(--primary-glow)))`,
                    }}
                  />
                </div>
              </li>
            );
          })}
        </ul>
      </div>

      {/* PULSE */}
      <div className="surface-card relative overflow-hidden rounded-2xl p-5 lg:col-span-3">
        <div className="mb-2 flex items-center justify-between">
          <h3 className="inline-flex items-center gap-2 text-sm font-bold text-foreground">
            <TrendingUp className="h-4 w-4 text-primary" />
            نبض الموقع
          </h3>
        </div>
        <div className="space-y-2">
          <PulseStat
            Icon={Activity}
            label="دورات مكتملة"
            value={stats?.cycles_completed ?? 0}
            tone="hsl(var(--info))"
          />
          <PulseStat
            Icon={Shield}
            label="موثوق"
            value={counts.verified}
            tone="hsl(var(--verified))"
          />
          <PulseStat
            Icon={AlertTriangle}
            label="مشكوك"
            value={counts.suspicious}
            tone="hsl(var(--warning))"
          />
          <PulseStat
            Icon={ShieldAlert}
            label="عالي الخطورة"
            value={counts.risky}
            tone="hsl(var(--primary))"
          />
          <PulseStat
            Icon={Loader2}
            label="قيد التصنيف"
            value={counts.neutral}
            tone="hsl(var(--muted-foreground))"
            spin
          />
        </div>
      </div>

      {/* MARQUEE TICKER */}
      <div className="surface-card relative overflow-hidden rounded-2xl py-2 lg:col-span-12">
        <div
          className="pointer-events-none absolute inset-y-0 right-0 z-10 w-32"
          style={{
            background:
              "linear-gradient(to left, hsl(var(--surface-elev)), hsl(var(--surface-elev) / 0))",
          }}
        />
        <div
          className="pointer-events-none absolute inset-y-0 left-0 z-10 w-32"
          style={{
            background:
              "linear-gradient(to right, hsl(var(--surface-elev)), hsl(var(--surface-elev) / 0))",
          }}
        />
        <div className="absolute right-3 top-1/2 z-20 -translate-y-1/2">
          <span className="inline-flex items-center gap-1.5 rounded-full border border-primary/40 bg-background/85 px-2.5 py-1 text-[10px] font-bold uppercase tracking-widest text-primary backdrop-blur">
            <span className="relative inline-flex h-1.5 w-1.5">
              <span className="absolute inline-flex h-full w-full animate-ping rounded-full bg-primary opacity-75" />
              <span className="relative inline-flex h-1.5 w-1.5 rounded-full bg-primary" />
            </span>
            LIVE
          </span>
        </div>
        <div className="overflow-hidden">
          <div className="ticker-marquee flex w-max gap-6 px-32 py-2">
            {tickerItems.length === 0 && (
              <span className="mono text-[11px] text-muted-foreground">
                جاري سحب الأخبار من المصادر…
              </span>
            )}
            {[...tickerItems, ...tickerItems].map((it, i) => {
              const tone = RISK_TONES[(it.risk_label as Risk) ?? "neutral"] ?? RISK_TONES.neutral;
              return (
                <span
                  key={`${it.id}-${i}`}
                  className="inline-flex shrink-0 items-center gap-2 text-[12px] text-foreground/85"
                  dir="auto"
                >
                  <span
                    className="h-1.5 w-1.5 shrink-0 rounded-full"
                    style={{ background: tone }}
                  />
                  <span className="font-bold text-muted-foreground">{it.source_name}</span>
                  <span aria-hidden className="text-muted-foreground/60">›</span>
                  <span className="max-w-[480px] truncate">{it.title}</span>
                </span>
              );
            })}
          </div>
        </div>
      </div>
    </div>
  );
};

const PulseStat = ({
  Icon,
  label,
  value,
  tone,
  spin,
}: {
  Icon: typeof Activity;
  label: string;
  value: number;
  tone: string;
  spin?: boolean;
}) => (
  <div
    className="flex items-center justify-between gap-3 rounded-lg border border-border px-3 py-2"
    style={{ background: "hsl(var(--surface-elev-2))" }}
  >
    <span className="inline-flex items-center gap-2 text-[11px] font-semibold text-foreground/85">
      <Icon
        className={`h-3.5 w-3.5 ${spin ? "animate-spin-slow" : ""}`}
        style={{ color: tone }}
      />
      {label}
    </span>
    <span className="mono text-lg font-extrabold" style={{ color: tone }}>{value}</span>
  </div>
);

const RiskDonut = ({
  counts,
  total,
  centerValue,
  classified,
  dangerPctOfClassified,
}: {
  counts: Record<Risk, number>;
  total: number;
  centerValue: number;
  classified: number;
  dangerPctOfClassified: number;
}) => {
  const size = 160;
  const r = 64;
  const stroke = 18;
  const c = 2 * Math.PI * r;
  const center = size / 2;

  let acc = 0;
  const segments: Array<{ k: Risk; pct: number; offset: number }> = [];
  for (const k of RISK_ORDER) {
    const v = counts[k];
    const pct = total > 0 ? v / total : 0;
    segments.push({ k, pct, offset: acc });
    acc += pct;
  }

  const empty = total === 0;

  return (
    <div className="relative mx-auto grid place-items-center" style={{ width: size, height: size }}>
      <svg width={size} height={size} className="-rotate-90">
        <circle
          cx={center}
          cy={center}
          r={r}
          fill="none"
          stroke="hsl(var(--surface-elev-2))"
          strokeWidth={stroke}
        />
        {!empty &&
          segments
            .filter((s) => s.pct > 0)
            .map((s) => (
              <circle
                key={s.k}
                cx={center}
                cy={center}
                r={r}
                fill="none"
                stroke={RISK_TONES[s.k]}
                strokeWidth={stroke}
                strokeDasharray={`${c * s.pct} ${c}`}
                strokeDashoffset={-c * s.offset}
                strokeLinecap="butt"
                style={{ transition: "stroke-dasharray 700ms ease" }}
              />
            ))}
      </svg>
      <div className="absolute inset-0 grid place-items-center text-center">
        {empty ? (
          <div>
            <div className="mono text-[10px] uppercase tracking-widest text-muted-foreground">جاري التحميل</div>
            <Loader2 className="mx-auto mt-1 h-5 w-5 animate-spin text-primary" />
          </div>
        ) : classified === 0 ? (
          <div>
            <div className="mono text-[9px] uppercase tracking-widest text-muted-foreground">
              قيد التصنيف
            </div>
            <div className="mono mt-0.5 text-2xl font-extrabold text-foreground leading-none">
              {counts.neutral}
            </div>
            <div className="mt-1 text-[9px] text-muted-foreground">عنصر جديد</div>
          </div>
        ) : (
          <div>
            <div className="mono text-[10px] uppercase tracking-widest text-muted-foreground">
              خطورة
            </div>
            <div
              className="mono text-3xl font-extrabold leading-none"
              style={{ color: "hsl(var(--primary))" }}
            >
              {dangerPctOfClassified}%
            </div>
            <div className="mt-1 text-[10px] text-muted-foreground">
              {centerValue}/{classified} مصنّفة
            </div>
          </div>
        )}
      </div>
    </div>
  );
};