import type { TradeSetup } from '../../lib/types';
import { formatPrice, formatPercent } from '../../lib/format';
import { recommendationActionDirection, recommendationActionLabel } from '../../lib/recommendation';

interface RecommendationPanelProps {
  symbol: string;
  longSetup?: TradeSetup;
  shortSetup?: TradeSetup;
  currentPrice?: number;
}

/**
 * How far current price has drifted from the setup's entry. A setup whose
 * entry is far from the live price (price already ran toward target, or fell
 * through the stop) is stale — entering now changes the risk/reward.
 */
function entryDrift(setup: TradeSetup, currentPrice?: number) {
  if (currentPrice == null || !setup.entry_price) return null;
  const pct = ((currentPrice - setup.entry_price) / setup.entry_price) * 100;
  const towardTarget = setup.direction === 'long' ? currentPrice >= setup.entry_price : currentPrice <= setup.entry_price;
  // Past the stop entirely = invalidated; moved >1/3 of the way to target = stale
  const span = Math.abs(setup.target - setup.entry_price);
  const moved = Math.abs(currentPrice - setup.entry_price);
  const beyondStop = setup.direction === 'long' ? currentPrice <= setup.stop_loss : currentPrice >= setup.stop_loss;
  let status: 'fresh' | 'stale' | 'invalidated' = 'fresh';
  if (beyondStop) status = 'invalidated';
  else if (span > 0 && moved / span > 0.33) status = 'stale';
  return { pct, towardTarget, status };
}

function riskClass(risk: TradeSetup['risk_level']) {
  if (risk === 'Low') return 'text-emerald-400';
  if (risk === 'Medium') return 'text-amber-400';
  if (risk === 'High') return 'text-red-400';
  return 'text-gray-400';
}

function isRecommended(setup: TradeSetup | undefined, action: TradeSetup['recommended_action'] | undefined) {
  if (!setup || !action) return false;
  if (setup.direction === 'long') return action.startsWith('LONG');
  return action.startsWith('SHORT');
}

function TargetTable({ setup }: { setup: TradeSetup }) {
  if (!setup.targets || setup.targets.length === 0) {
    return <p className="text-xs text-gray-500">No target probabilities available.</p>;
  }

  return (
    <div className="overflow-x-auto">
      <table className="w-full text-xs">
        <thead>
          <tr className="text-left text-gray-500 border-b border-white/[0.06]">
            <th className="py-2 pr-3">Classification</th>
            <th className="py-2 pr-3">Price</th>
            <th className="py-2 pr-3">Distance</th>
            <th className="py-2 pr-3">R:R</th>
            <th className="py-2">Probability</th>
          </tr>
        </thead>
        <tbody>
          {setup.targets.map((target) => (
            <tr key={`${setup.id}-${target.sr_level_id}-${target.price}`} className="border-b border-white/[0.04]">
              <td className="py-2 pr-3 text-gray-300">{target.classification}</td>
              <td className="py-2 pr-3 font-mono text-gray-200">{formatPrice(target.price)}</td>
              <td className="py-2 pr-3 font-mono text-gray-200">{formatPercent((target.distance_from_entry / setup.entry_price) * 100)}</td>
              <td className="py-2 pr-3 font-mono text-gray-200">{target.rr_ratio.toFixed(2)}</td>
              <td className="py-2 font-mono text-gray-200">{target.probability.toFixed(1)}%</td>
            </tr>
          ))}
        </tbody>
      </table>
    </div>
  );
}

function SetupCard({ setup, action, currentPrice }: { setup?: TradeSetup; action?: TradeSetup['recommended_action']; currentPrice?: number }) {
  if (!setup) {
    return (
      <div className="glass-sm p-4 text-xs text-gray-500">
        Setup unavailable for this direction.
      </div>
    );
  }

  const recommended = isRecommended(setup, action);
  const drift = entryDrift(setup, currentPrice);

  return (
    <div
      data-direction={setup.direction}
      className={`glass-sm p-4 space-y-3 ${recommended ? 'border border-emerald-500/40' : 'opacity-80'}`}
    >
      <div className="flex items-center justify-between">
        <h4 className={`text-sm font-semibold ${setup.direction === 'long' ? 'text-emerald-400' : 'text-red-400'}`}>
          {setup.direction.toUpperCase()}
        </h4>
        <span className="text-xs text-gray-300">{setup.confidence_score?.toFixed(1) ?? '—'}%</span>
      </div>

      {!recommended && recommendationActionDirection(action ?? null) !== 'neutral' && (
        <p className="text-[11px] text-amber-400">Alternative setup (ticker bias currently favors the opposite direction).</p>
      )}

      {drift && drift.status === 'invalidated' && (
        <p className="text-[11px] text-red-400">
          ⚠ Price ({formatPrice(currentPrice!)}) is past the stop — this setup is invalidated.
        </p>
      )}
      {drift && drift.status === 'stale' && (
        <p className="text-[11px] text-amber-400">
          ⚠ Price has moved {drift.pct >= 0 ? '+' : ''}{drift.pct.toFixed(1)}% from entry{drift.towardTarget ? ' toward target' : ' against the setup'} — entry may be stale.
        </p>
      )}

      <div className="grid grid-cols-2 gap-2 text-xs">
        <div className="text-gray-500">Current</div><div className="font-mono text-gray-200">{currentPrice != null ? formatPrice(currentPrice) : '—'}</div>
        <div className="text-gray-500">Entry</div><div className="font-mono text-gray-200">{formatPrice(setup.entry_price)}{drift ? ` (${drift.pct >= 0 ? '+' : ''}${drift.pct.toFixed(1)}%)` : ''}</div>
        <div className="text-gray-500">Stop</div><div className="font-mono text-gray-200">{formatPrice(setup.stop_loss)}</div>
        <div className="text-gray-500">Primary Target</div><div className="font-mono text-gray-200">{formatPrice(setup.target)}</div>
        <div className="text-gray-500">R:R</div><div className="font-mono text-gray-200">{setup.rr_ratio.toFixed(2)}</div>
      </div>

      <TargetTable setup={setup} />

      {setup.conflict_flags.length > 0 && (
        <div className="rounded border border-amber-500/30 bg-amber-500/10 p-2 text-[11px] text-amber-300">
          {setup.conflict_flags.join(' • ')}
        </div>
      )}
    </div>
  );
}

export function RecommendationPanel({ symbol, longSetup, shortSetup, currentPrice }: RecommendationPanelProps) {
  const summary = longSetup?.recommendation_summary ?? shortSetup?.recommendation_summary;
  const action = (summary?.action ?? 'NEUTRAL') as TradeSetup['recommended_action'];
  const preferredDirection = recommendationActionDirection(action);

  const preferredSetup =
    preferredDirection === 'long'
      ? longSetup
      : preferredDirection === 'short'
        ? shortSetup
        : undefined;

  const alternativeSetup =
    preferredDirection === 'long'
      ? shortSetup
      : preferredDirection === 'short'
        ? longSetup
        : undefined;

  if (!longSetup && !shortSetup) {
    return null;
  }

  return (
    <section>
      <h2 className="mb-3 text-xs font-medium uppercase tracking-widest text-gray-500">Recommendation</h2>
      <div className="glass p-5 space-y-4">
        <div className="flex flex-wrap items-center gap-4">
          <span className="text-sm font-semibold text-blue-300">{recommendationActionLabel(action)}</span>
          <span className={`text-sm font-semibold ${riskClass(summary?.risk_level ?? null)}`}>
            Risk: {summary?.risk_level ?? '—'}
          </span>
          <span className="text-sm text-gray-300">Composite: {summary?.composite_score?.toFixed(1) ?? '—'}</span>
          <span className="text-xs text-gray-500">{symbol.toUpperCase()}</span>
        </div>

        <p className="text-xs text-gray-500">Recommended Action is the ticker-level bias. The preferred setup is shown first; the opposite side is available under Alternative scenario.</p>

        {summary?.reasoning && (
          <p className="text-sm text-gray-300">{summary.reasoning}</p>
        )}

        {preferredDirection !== 'neutral' && preferredSetup ? (
          <div className="space-y-3">
            <SetupCard setup={preferredSetup} action={action} currentPrice={currentPrice} />

            {alternativeSetup && (
              <details className="glass-sm p-3">
                <summary className="cursor-pointer text-xs font-medium text-gray-300">
                  Alternative scenario ({alternativeSetup.direction.toUpperCase()})
                </summary>
                <div className="mt-3">
                  <SetupCard setup={alternativeSetup} action={action} currentPrice={currentPrice} />
                </div>
              </details>
            )}
          </div>
        ) : (
          <div className="grid gap-4 lg:grid-cols-2">
            <SetupCard setup={longSetup} action={action} currentPrice={currentPrice} />
            <SetupCard setup={shortSetup} action={action} currentPrice={currentPrice} />
          </div>
        )}
      </div>
    </section>
  );
}