import React from 'react';
import { BookOpen, X } from 'lucide-react';
import 'katex/dist/katex.min.css';
import { BlockMath, InlineMath } from 'react-katex';

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

export default function ScannerMathModal({ isOpen, onClose }: ScannerMathModalProps) {
  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-950/90 backdrop-blur-md p-4 sm:p-6 md:p-8">
      <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-950/40 border-b border-slate-800/60">
          <div>
            <h2 className="text-base font-bold bg-gradient-to-r from-amber-400 to-orange-400 bg-clip-text text-transparent flex items-center gap-2">
              <BookOpen className="w-5 h-5 text-amber-400" /> Overreaction Scanner - Math & Logic Specification
            </h2>
            <p className="text-[10px] text-slate-500 font-mono">Institutional Specification Manual</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-6 text-slate-300 scrollbar-thin">
          <div className="space-y-6">
            <div className="border-b border-slate-800/80 pb-3">
              <h3 className="text-base font-bold text-slate-200">2. Deep-Value & Overreaction Scanner Engine</h3>
              <p className="text-xs text-slate-400 mt-1">Filters stocks experiencing extreme technical selling deviations backed by cheap fundamental valuations.</p>
            </div>

            <div className="space-y-3">
              <h4 className="text-xs font-bold text-amber-400 uppercase tracking-wider font-mono">A. Ingestion & Pipeline Tiers</h4>
              <p className="text-xs leading-relaxed text-slate-400">
                Scans the entire corporate equity universe daily, segmenting equities into three distinct market capitalization classes to identify localized overreactions:
              </p>
              <div className="grid grid-cols-3 gap-3 text-[11px] text-slate-400 font-mono text-center">
                <div className="bg-slate-950/40 p-3 rounded-lg border border-slate-800/50">
                  <span className="block font-bold text-slate-300">Mega Caps</span>
                  <span>&gt; $100B</span>
                </div>
                <div className="bg-slate-950/40 p-3 rounded-lg border border-slate-800/50">
                  <span className="block font-bold text-slate-300">Mid Caps</span>
                  <span>$10B - $100B</span>
                </div>
                <div className="bg-slate-950/40 p-3 rounded-lg border border-slate-800/50">
                  <span className="block font-bold text-slate-300">Small Caps</span>
                  <span>&lt; $10B</span>
                </div>
              </div>
            </div>

            <div className="space-y-3">
              <h4 className="text-xs font-bold text-amber-400 uppercase tracking-wider font-mono">B. Technical Distancing Formulas</h4>
              <p className="text-xs leading-relaxed text-slate-400">
                Calculates price distance ratios relative to support levels:
              </p>
              <div className="bg-slate-950/40 p-4 rounded-xl border border-slate-800/60 my-2 space-y-4">
                <div>
                  <p className="text-xs text-slate-400 mb-1">1. 52-Week High Deviation:</p>
                  <BlockMath math="\Delta_{52w} = \frac{P_{\text{current}} - P_{52w\_high}}{P_{52w\_high}}" />
                </div>
                <div>
                  <p className="text-xs text-slate-400 mb-1">2. 50-Day Moving Average Drop:</p>
                  <BlockMath math="\Delta_{MA} = \frac{P_{\text{current}} - \text{MA}_{50}}{\text{MA}_{50}}" />
                </div>
                <div>
                  <p className="text-xs text-slate-400 mb-1">3. Relative Strength Index (RSI-14) with smoothing:</p>
                  <BlockMath math="\text{RSI} = 100 - \frac{100}{1 + \text{RS}}" />
                  <BlockMath math="\text{RS} = \frac{\text{Smoothed Gain}_t}{\text{Smoothed Loss}_t}" />
                  <p className="text-[11px] text-slate-500 mt-2 font-mono">
                    where smoothed elements use Welles Wilder <InlineMath math="\alpha = 1/14" />. Deep oversold signals trigger at <InlineMath math="\text{RSI} < 30" />.
                  </p>
                </div>
              </div>
            </div>

            <div className="space-y-3">
              <h4 className="text-xs font-bold text-amber-400 uppercase tracking-wider font-mono">C. Fundamental Cheapness Overlay & Forward Valuations</h4>
              <p className="text-xs leading-relaxed text-slate-400">
                To avoid value traps, technical drop factors are coupled with valuation metrics fetched in real-time from FMP:
              </p>
              <div className="bg-slate-950/40 p-4 rounded-xl border border-slate-800/60 my-2 space-y-4">
                <ul className="list-disc pl-5 text-xs text-slate-400 space-y-2 font-mono">
                  <li><strong>Trailing P/E</strong>: Measures the price relative to trailing 12-month earnings.</li>
                  <li><strong>Price-to-Book</strong>: Measures the asset backing relative to equity capital.</li>
                  <li><strong>Dividend Yield (%)</strong>: Tangible dividend payouts to measure cash backflow support.</li>
                  <li><strong>PEG Ratio</strong>: Relates PE multiple to annual earnings growth:
                    <BlockMath math="\text{PEG} = \frac{\text{PE Ratio}}{\text{Earnings Growth Rate} \times 100}" />
                  </li>
                </ul>
                <div className="border-t border-slate-850 pt-3">
                  <p className="text-xs text-slate-400 mb-1">Implicit Forward P/E calculation from PEG relationship:</p>
                  <BlockMath math="\text{Forward PE} = \frac{\text{Trailing PE}}{1 + g_{\text{implicit}}}" />
                  <BlockMath math="g_{\text{implicit}} = \frac{\text{Trailing PE}}{\text{PEG} \times 100}" />
                  <p className="text-[11px] text-slate-500 mt-2 font-mono">
                    If PEG is unavailable, a default growth rate of <InlineMath math="10\%" /> is assumed as a conservative fallback baseline.
                  </p>
                </div>
              </div>
            </div>
          </div>
        </div>
      </div>
    </div>
  );
}
