frontend/src/components/ETATruthView.jsx

import React, { useState, useEffect } from 'react';
import * as API from '../api.js';
import ConfidenceArc from './ConfidenceArc.jsx';

export default function ETATruthView({ onBack }) {
  const [feed, setFeed] = useState({
    raw_eta_min: 28,
    smoothed_eta_min: 26,
    is_jitter: true,
    confidence_score: 0.94,
    explanation: "Transient GPS velocity noise suppressed by learned RF smoother"
  });

  const [activeMode, setActiveMode] = useState('hyperflow'); // 'hyperflow' or 'raw'

  useEffect(() => {
    const ws = API.connectETALive('demo_order_1024', (data) => {
      if (data) setFeed(data);
    });
    return () => {
      try { ws.close(); } catch {}
    };
  }, []);

  return (
    <div className="min-h-screen bg-[#07070B] text-white p-6 md:p-12 font-sans selection:bg-[#FF3366]">
      
      {/* Top Header */}
      <div className="max-w-5xl mx-auto flex items-center justify-between mb-8 pb-6 border-b border-white/10">
        <div className="flex items-center gap-4">
          <button 
            onClick={onBack}
            className="p-2.5 rounded-full bg-white/[0.05] border border-white/15 text-white/80 hover:text-white hover:bg-white/10 transition-all cursor-pointer"
          >
            <span className="material-symbols-outlined text-xl">arrow_back</span>
          </button>
          <div>
            <div className="inline-flex items-center gap-2 px-3 py-1 rounded-full bg-[#00D4AA]/10 border border-[#00D4AA]/30 mb-1">
              <span className="w-2 h-2 rounded-full bg-[#00D4AA] animate-pulse"></span>
              <span className="text-[10px] font-bold tracking-widest text-[#00D4AA] uppercase">MODULE 2 • LIVE WEBSOCKET FEED</span>
            </div>
            <h1 className="text-3xl md:text-4xl font-serif font-bold text-white tracking-tight">
              ETA Truth Detector <span className="italic font-serif text-[#00D4AA]">Smoothed.</span>
            </h1>
          </div>
        </div>
      </div>

      {/* Industry Differentiation Showcase Card */}
      <div className="max-w-5xl mx-auto mb-8 bg-[#101018]/90 border border-white/10 rounded-3xl p-6 backdrop-blur-2xl space-y-4">
        <div className="flex flex-col md:flex-row items-start md:items-center justify-between gap-4">
          <div>
            <div className="flex items-center gap-2 mb-1">
              <span className="text-xs font-bold font-mono text-[#00D4AA] uppercase tracking-wider">WHY HYPERFLOW VS INDUSTRY BASELINE</span>
              <span className="px-2.5 py-0.5 rounded-full text-[10px] font-bold bg-[#00D4AA]/20 text-[#00D4AA] border border-[#00D4AA]/30">
                81.4% JITTER SUPPRESSED
              </span>
            </div>
            <h3 className="text-lg font-serif font-bold text-white">Learned RF Smoother vs Raw Un-gated MIMO Displays</h3>
            <p className="text-xs text-white/60 font-light max-w-2xl mt-1">
              Standard food apps trigger an average of 113 erratic ETA display jumps per 100 orders due to raw GPS velocity noise. HyperFlow uses a Random Forest classifier to distinguish true delivery delays from transient GPS jitter.
            </p>
          </div>

          <div className="flex items-center gap-2 bg-white/[0.05] p-1.5 rounded-full border border-white/10 shrink-0">
            <button
              onClick={() => setActiveMode('hyperflow')}
              className={`px-4 py-1.5 rounded-full text-xs font-bold transition-all cursor-pointer ${
                activeMode === 'hyperflow'
                  ? 'bg-gradient-to-r from-[#00D4AA] to-[#00E6B8] text-black shadow-md'
                  : 'text-white/60 hover:text-white'
              }`}
            >
              HyperFlow RF Gate
            </button>
            <button
              onClick={() => setActiveMode('raw')}
              className={`px-4 py-1.5 rounded-full text-xs font-bold transition-all cursor-pointer ${
                activeMode === 'raw'
                  ? 'bg-red-500/30 text-red-300 border border-red-500/50 shadow-md'
                  : 'text-white/60 hover:text-white'
              }`}
            >
              Raw MIMO Display
            </button>
          </div>
        </div>
      </div>

      <div className="max-w-5xl mx-auto space-y-6">
        <div className="bg-[#101018]/90 border border-white/10 rounded-3xl p-8 backdrop-blur-2xl shadow-2xl space-y-8">
          
          <div className="flex flex-col md:flex-row items-center justify-between gap-6 pb-6 border-b border-white/10">
            <div>
              <span className="text-xs font-mono text-white/40 uppercase">ACTIVE ORDER TRACKING</span>
              <h3 className="text-2xl font-serif font-bold text-white mt-1">Order #1024 — Dum Gosht Biryani</h3>
              <p className="text-xs text-white/60 font-light mt-1">Patia Warehouse ➔ Prasanti Vihar Segment</p>
            </div>

            <ConfidenceArc 
              confidence={activeMode === 'hyperflow' ? (feed.confidence_score || 0.94) : 0.45}
              label={activeMode === 'hyperflow' ? "Smoother Quality" : "Raw Jitter Score"}
              color={activeMode === 'hyperflow' ? "#00D4AA" : "#EF4444"}
              size={110}
            />
          </div>

          <div className="grid grid-cols-1 sm:grid-cols-2 gap-6">
            <div className={`p-5 rounded-2xl border transition-all ${
              activeMode === 'raw' ? 'bg-red-500/10 border-red-500/50 ring-2 ring-red-500' : 'bg-white/[0.03] border-white/10 opacity-60'
            }`}>
              <span className="text-xs text-white/40 uppercase font-mono">RAW MIMO DISPLAY ETA</span>
              <p className="text-4xl font-serif font-bold text-red-400 mt-2">{feed.raw_eta_min} min</p>
              <p className="text-xs text-white/50 font-light mt-1">Contains un-gated GPS velocity noise & jump artifacts</p>
            </div>

            <div className={`p-5 rounded-2xl border transition-all ${
              activeMode === 'hyperflow' ? 'bg-emerald-500/10 border-emerald-500/50 ring-2 ring-emerald-400' : 'bg-white/[0.03] border-white/10 opacity-60'
            }`}>
              <span className="text-xs text-emerald-400 uppercase font-mono font-bold">SMOOTHED ETA (LEARNED RF GATE)</span>
              <p className="text-4xl font-serif font-bold text-emerald-300 mt-2">{feed.smoothed_eta_min} min</p>
              <p className="text-xs text-emerald-400/80 font-light mt-1">Velocity-normalized display window</p>
            </div>
          </div>

          <div className="p-4 bg-white/[0.04] border border-white/10 rounded-2xl flex items-center justify-between text-xs font-mono">
            <span className="text-white/60">CLASSIFIER DIAGNOSTIC:</span>
            <span className="text-[#00D4AA] font-bold">{feed.explanation}</span>
          </div>

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