'use client';
import { useEffect, useState } from 'react';
import { useActiveSymbol } from '@/stores/active-symbol-store';
import { api, type Snapshot } from '@/lib/trpc';

/**
 * Market Outlook Panel — macro analysis and sector context for the active symbol.
 * Shows sector/industry info, ticker kind classification, and peer context.
 * Educational display only — no trade recommendations.
 */

interface SectorData {
  symbol: string;
  name: string | null;
  sector: string | null;
  industry: string | null;
  exchange: string | null;
  tickerKind: string;
  peers: string[] | null;
}

export function MarketOutlookPanel() {
  const symbol = useActiveSymbol((s) => s.activeSymbol);
  const [snap, setSnap] = useState<Snapshot | null>(null);
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState<string | null>(null);

  useEffect(() => {
    let cancelled = false;
    setLoading(true);
    setError(null);
    api.market.snapshot(symbol)
      .then((s) => { if (!cancelled) { setSnap(s); setLoading(false); } })
      .catch((e) => { if (!cancelled) { setError(e instanceof Error ? e.message : 'request failed'); setLoading(false); } });
    return () => { cancelled = true; };
  }, [symbol]);

  const sector: SectorData | null = snap?.sector ?? null;
  const quote = snap?.quote ?? null;
  const candles = snap?.candles ?? [];

  // Simple trend estimation from recent candles
  const trend = candles.length >= 20 ? (() => {
    const recent20 = candles.slice(-20);
    const firstHalf = recent20.slice(0, 10).reduce((s, c) => s + c.c, 0) / 10;
    const secondHalf = recent20.slice(10).reduce((s, c) => s + c.c, 0) / 10;
    const pctChange = ((secondHalf - firstHalf) / firstHalf) * 100;
    if (pctChange > 3) return { label: 'Trending Up', color: 'text-[#34d399]', icon: '▲' };
    if (pctChange < -3) return { label: 'Trending Down', color: 'text-[#ef4444]', icon: '▼' };
    return { label: 'Range-Bound', color: 'text-[#fbbf24]', icon: '—' };
  })() : null;

  // Volatility estimate from recent candles
  const volatility = candles.length >= 20 ? (() => {
    const returns = candles.slice(-20).map((c, i, arr) => i > 0 ? (c.c - arr[i - 1].c) / arr[i - 1].c : 0).slice(1);
    const mean = returns.reduce((a, b) => a + b, 0) / returns.length;
    const variance = returns.reduce((s, r) => s + (r - mean) ** 2, 0) / returns.length;
    const dailyVol = Math.sqrt(variance);
    const annualizedVol = dailyVol * Math.sqrt(252) * 100;
    if (annualizedVol > 50) return { label: 'High', color: 'text-[#ef4444]', value: annualizedVol.toFixed(0) };
    if (annualizedVol > 25) return { label: 'Moderate', color: 'text-[#fbbf24]', value: annualizedVol.toFixed(0) };
    return { label: 'Low', color: 'text-[#34d399]', value: annualizedVol.toFixed(0) };
  })() : null;

  if (loading) {
    return (
      <section className="rounded-xl border border-[#2a2b3a] bg-[#121318] p-5 hover:shadow-[0_2px_8px_rgba(79,140,255,0.1)] transition-shadow duration-300">
        <h2 className="text-base font-semibold text-[#e6e7ec]">Market Outlook</h2>
        <p className="text-sm text-[#5a5b6a] py-8">Loading market data…</p>
      </section>
    );
  }

  if (error) {
    return (
      <section className="rounded-xl border border-[#2a2b3a] bg-[#121318] p-5 hover:shadow-[0_2px_8px_rgba(79,140,255,0.1)] transition-shadow duration-300">
        <h2 className="text-base font-semibold text-[#e6e7ec]">Market Outlook</h2>
        <p className="text-sm text-[#ef4444] py-8">{error}</p>
      </section>
    );
  }

  return (
    <section className="rounded-xl border border-[#2a2b3a] bg-[#121318] p-5 space-y-5 hover:shadow-[0_2px_8px_rgba(79,140,255,0.1)] transition-shadow duration-300">
      <header className="flex items-baseline justify-between gap-4">
        <h2 className="text-base font-semibold text-[#e6e7ec]">Market Outlook</h2>
        <span className="text-xs text-[#8a8b9a]">{symbol}</span>
      </header>

      {/* Sector & Industry */}
      {sector && (
        <div className="grid grid-cols-2 sm:grid-cols-4 gap-4">
          <div className="rounded-lg bg-[#1a1b24] border border-[#2a2b3a] p-3">
            <p className="text-[10px] uppercase tracking-wider text-[#5a5b6a] mb-1">Sector</p>
            <p className="text-sm font-semibold text-[#e6e7ec]">{sector.sector ?? '—'}</p>
          </div>
          <div className="rounded-lg bg-[#1a1b24] border border-[#2a2b3a] p-3">
            <p className="text-[10px] uppercase tracking-wider text-[#5a5b6a] mb-1">Industry</p>
            <p className="text-sm font-semibold text-[#e6e7ec]">{sector.industry ?? '—'}</p>
          </div>
          <div className="rounded-lg bg-[#1a1b24] border border-[#2a2b3a] p-3">
            <p className="text-[10px] uppercase tracking-wider text-[#5a5b6a] mb-1">Type</p>
            <p className="text-sm font-semibold text-[#e6e7ec] capitalize">{sector.tickerKind}</p>
          </div>
          <div className="rounded-lg bg-[#1a1b24] border border-[#2a2b3a] p-3">
            <p className="text-[10px] uppercase tracking-wider text-[#5a5b6a] mb-1">Exchange</p>
            <p className="text-sm font-semibold text-[#e6e7ec]">{sector.exchange ?? '—'}</p>
          </div>
        </div>
      )}

      {/* Trend & Volatility */}
      <div className="grid grid-cols-1 sm:grid-cols-2 gap-4">
        {trend && (
          <div className="rounded-lg bg-[#1a1b24] border border-[#2a2b3a] p-4">
            <p className="text-[10px] uppercase tracking-wider text-[#5a5b6a] mb-2">20-Day Trend</p>
            <div className="flex items-center gap-2">
              <span className={`text-lg ${trend.color}`} aria-hidden="true">{trend.icon}</span>
              <span className={`text-sm font-semibold ${trend.color}`}>{trend.label}</span>
            </div>
            <p className="text-[11px] text-[#5a5b6a] mt-2">
              Based on the average closing price of the first 10 vs last 10 of the most recent 20 trading days.
            </p>
          </div>
        )}

        {volatility && (
          <div className="rounded-lg bg-[#1a1b24] border border-[#2a2b3a] p-4">
            <p className="text-[10px] uppercase tracking-wider text-[#5a5b6a] mb-2">Volatility (Annualized)</p>
            <div className="flex items-baseline gap-2">
              <span className={`text-2xl font-bold font-mono ${volatility.color}`}>{volatility.value}%</span>
              <span className={`text-xs ${volatility.color}`}>{volatility.label}</span>
            </div>
            <p className="text-[11px] text-[#5a5b6a] mt-2">
              Derived from daily returns over the last 20 trading days, annualized (×√252).
            </p>
          </div>
        )}
      </div>

      {/* Peers */}
      {sector?.peers && sector.peers.length > 0 && (
        <div>
          <p className="text-[10px] uppercase tracking-wider text-[#5a5b6a] mb-2">Peers</p>
          <div className="flex flex-wrap gap-1.5">
            {sector.peers.map((peer) => (
              <span key={peer} className="px-2 py-1 rounded-lg bg-[#1a1b24] border border-[#2a2b3a] text-xs text-[#8a8b9a] font-mono">
                {peer}
              </span>
            ))}
          </div>
        </div>
      )}

      {/* Educational note */}
      <div className="pt-3 border-t border-[#2a2b3a]">
        <p className="text-[11px] text-[#5a5b6a]">
          This panel provides sector and statistical context for the active symbol. Trend and volatility
          estimates are based on recent price history and are for educational reference only.
        </p>
      </div>
    </section>
  );
}