import React from 'react';
import { Settings, X } from 'lucide-react';

interface ScannerBlueprintModalProps {
  isOpen: boolean;
  onClose: () => void;
}

export default function ScannerBlueprintModal({ isOpen, onClose }: ScannerBlueprintModalProps) {
  React.useEffect(() => {
    const handleKeyDown = (e: KeyboardEvent) => {
      if (e.key === 'Escape') {
        onClose();
      }
    };
    if (isOpen) {
      window.addEventListener('keydown', handleKeyDown);
    }
    return () => {
      window.removeEventListener('keydown', handleKeyDown);
    };
  }, [isOpen, onClose]);

  if (!isOpen) return null;

  return (
    <div className="fixed inset-0 z-50 flex items-center justify-center bg-slate-900/85 backdrop-blur-md p-4 sm:p-6 md:p-8 animate-fade-in">
      <div className="bg-slate-900 border border-slate-800/80 rounded-3xl w-full max-w-4xl h-[80vh] flex flex-col overflow-hidden shadow-2xl relative text-slate-350">
        
        {/* Modal Header */}
        <div className="flex justify-between items-center px-6 py-4 bg-slate-950/45 border-b border-slate-800/60">
          <div>
            <h2 className="text-base font-bold bg-gradient-to-r from-emerald-400 to-teal-400 bg-clip-text text-transparent flex items-center gap-2">
              <Settings className="w-5 h-5 text-emerald-400" /> Anomalies Scanner - Operational Blueprint
            </h2>
            <p className="text-[10px] text-slate-500 font-mono">System User Manual &amp; Interface Mechanics</p>
          </div>
          <button
            onClick={onClose}
            className="text-slate-400 hover:text-slate-200 bg-slate-950/50 border border-slate-800 hover:border-slate-700 p-2 rounded-xl transition-all cursor-pointer flex items-center justify-center"
            aria-label="Close modal"
          >
            <X className="w-4 h-4" />
          </button>
        </div>

        {/* Modal Body */}
        <div className="flex-1 overflow-y-auto p-6 sm:p-8 space-y-8 text-slate-350 scrollbar-thin">
          
          <div className="border-b border-slate-800/80 pb-3">
            <h3 className="text-base font-bold text-slate-200">Scanner Metrics &amp; Signals</h3>
            <p className="text-xs text-slate-400 mt-1">Operational details of the anomaly scanner and valuation filters.</p>
          </div>

          {/* Core Mechanics */}
          <div className="grid grid-cols-1 md:grid-cols-3 gap-4">
            <div className="p-4 rounded-xl border border-slate-800/60 bg-slate-950/40 space-y-2">
              <h4 className="text-xs font-bold text-emerald-400 uppercase tracking-wider font-mono">1. 52-Week Drop Mechanics</h4>
              <p className="text-xs text-slate-400 leading-relaxed font-sans">
                Filters the stock database for liquid companies trading at significant percentage discounts relative to their 52-week peak. Isolates severe drawdowns caused by asymmetric market overreactions.
              </p>
            </div>
            
            <div className="p-4 rounded-xl border border-slate-800/60 bg-slate-950/40 space-y-2">
              <h4 className="text-xs font-bold text-emerald-400 uppercase tracking-wider font-mono">2. Welles Wilder RSI-14 Velocity</h4>
              <p className="text-xs text-slate-400 leading-relaxed font-sans">
                Uses the smoothed Wilder Relative Strength Index to identify deep oversold thresholds (RSI &lt; 25). Momentum velocity measures standard deviation shocks in the indicator to forecast buy-exhaustion and selloff capitulations.
              </p>
            </div>

            <div className="p-4 rounded-xl border border-slate-800/60 bg-slate-950/40 space-y-2">
              <h4 className="text-xs font-bold text-emerald-400 uppercase tracking-wider font-mono">3. FMP Valuation Overlay</h4>
              <p className="text-xs text-slate-400 leading-relaxed font-sans">
                Parses active valuation multiples: Price-to-Earnings (P/E), Price-to-Book (P/B), Dividend Yield, and Price/Earnings-to-Growth (PEG) ratios. Analyzes whether the selloff is justified fundamentally or is a dislocation from value.
              </p>
            </div>
          </div>

          {/* Interface Specifications */}
          <div className="space-y-3">
            <h3 className="text-sm font-bold text-slate-200 border-b border-slate-800 pb-2">User Actions &amp; Interface Mechanics</h3>
            <div className="text-xs text-slate-400 space-y-3 leading-relaxed">
              <p>
                <strong className="text-emerald-400 font-semibold">Diagnostic Drawers:</strong> Clicking on any row in the scanner table opens an interactive drawer where you can analyze the drop catalyst: *Systemic Selloff, Supply Chain Disruption, Executive Shift, Regulatory Issue / Fine,* or *Earnings Miss*.
              </p>
              <p>
                <strong className="text-emerald-400 font-semibold">GJR-GARCH Rebound Probability:</strong> The drawer displays a real-time rebound probability score. The GJR-GARCH model calculates conditional downside volatility, while the selected catalyst dynamically adjusts the rebound expectations based on historical asset-recovery statistics.
              </p>
              <p>
                <strong className="text-emerald-400 font-semibold">Deep-Check Search Mask:</strong> Permits manual lookup of individual tickers. Ingests cash flow and balance sheet metrics from the backend API, displaying current Sloan ratios and GJR-GARCH conditional Value-at-Risk limits.
              </p>
            </div>
          </div>

        </div>
      </div>
    </div>
  );
}
