import { useEffect, useRef } from 'react'
import anime from 'animejs'

// Per-source display config
const SOURCE = {
  ml: {
    icon: '🤖',
    title: 'AI Model',
    desc: 'Machine learning trained on 5 years of price history',
    plain: {
      BUY:          'Our AI sees patterns similar to when prices rose in the past',
      'STRONG BUY': 'Our AI is strongly predicting upward movement',
      SELL:         'Our AI sees patterns similar to when prices dropped in the past',
      'STRONG SELL':'Our AI is strongly predicting downward movement',
      HOLD:         'Our AI is not confident enough to call a direction yet',
    },
  },
  technical: {
    icon: '📊',
    title: 'Chart Analysis',
    desc: 'Price trends, momentum, moving averages & volume',
    plain: {
      BUY:          'Price is trending up with positive momentum',
      'STRONG BUY': 'Strong uptrend — multiple chart indicators agree',
      SELL:         'Price is trending down — momentum looks negative',
      'STRONG SELL':'Strong downtrend — charts are flashing warning signs',
      HOLD:         'Chart signals are mixed — no clear trend right now',
    },
  },
  fundamental: {
    icon: '🏢',
    title: 'Company Health',
    desc: 'P/E ratio, revenue growth, profit margins & debt',
    plain: {
      undervalued:  'The company looks like a potential bargain vs similar companies',
      overvalued:   'The stock may be expensive compared to what the company actually earns',
      'fair value': 'The company is priced fairly for its size and earnings',
      unknown:      'Not enough financial data to form a clear view',
    },
  },
  sentiment: {
    icon: '📰',
    title: 'News & Mood',
    desc: 'Recent headlines and investor sentiment from the web',
    plain: {
      BULLISH: 'Recent news and investor mood are mostly positive',
      BEARISH: 'Recent news and investor mood are mostly negative',
      NEUTRAL: 'News is balanced — no strong positive or negative lean',
    },
  },
}

// Signal → colour
function signalColor(score) {
  if (score > 0.2)  return '#00e87a'
  if (score < -0.2) return '#ff4466'
  return '#ffcc44'
}

// Normalise signal text for display
function formatSignal(signal) {
  return (signal || 'HOLD').toString().toUpperCase()
}

// ── Individual card ───────────────────────────────────────────────────────────

function SignalCard({ sourceKey, sourceData, index }) {
  const barRef = useRef(null)

  const cfg    = SOURCE[sourceKey] || SOURCE.technical
  const score  = sourceData.score ?? 0
  const signal = sourceData.signal ?? 'HOLD'
  const weight = Math.round((sourceData.weight ?? 0) * 100)
  const color  = signalColor(score)
  const barPct = Math.round((score + 1) * 50)    // -1..+1 → 0..100%

  // Pick plain-English text
  const plainMap = cfg.plain
  const signalKey = signal.toString()
  const plainText =
    plainMap[signalKey] ||
    plainMap[signalKey.toUpperCase()] ||
    Object.values(plainMap)[1] ||
    ''

  useEffect(() => {
    anime({
      targets: barRef.current,
      width: ['0%', `${barPct}%`],
      delay: 700 + index * 120,
      duration: 1000,
      easing: 'easeOutExpo',
    })
  }, [])

  return (
    <div
      className="signal-card card"
      style={{ '--signal-color': color }}
    >
      {/* Header: icon + title + badge */}
      <div className="signal-card-header">
        <span className="signal-icon">{cfg.icon}</span>
        <div className="signal-header-text">
          <h4 className="signal-title">{cfg.title}</h4>
          <p className="signal-desc">{cfg.desc}</p>
        </div>
        <div
          className="signal-badge"
          style={{
            color,
            borderColor: color + '44',
            background: color + '11',
          }}
        >
          {formatSignal(signal)}
        </div>
      </div>

      {/* Progress bar */}
      <div className="signal-bar-row">
        <div className="signal-bar-track">
          <div
            ref={barRef}
            className="signal-bar-fill"
            style={{ width: '0%', background: color }}
          />
          <div className="signal-bar-center" />
        </div>
        <span className="signal-weight">Weight {weight}%</span>
      </div>

      {/* Plain English */}
      <p className="signal-plain">{plainText}</p>

      {/* ML extras */}
      {sourceKey === 'ml' && (
        <div className="signal-meta">
          {sourceData.cv_accuracy != null && (
            <span>
              Model accuracy: {(sourceData.cv_accuracy * 100).toFixed(0)}%
            </span>
          )}
          {sourceData.margin != null && (
            <span>
              Decision margin: {(sourceData.margin * 100).toFixed(0)}%
            </span>
          )}
          {sourceData.strength && (
            <span>Signal strength: {sourceData.strength}</span>
          )}
        </div>
      )}

      {/* Technical extras */}
      {sourceKey === 'technical' && sourceData.votes && (
        <div className="signal-meta">
          <span>
            Bullish votes: {sourceData.votes[0]} / Bearish: {sourceData.votes[1]}
          </span>
        </div>
      )}
    </div>
  )
}

// ── Container ─────────────────────────────────────────────────────────────────

export default function SignalCards({ breakdown }) {
  const gridRef = useRef(null)

  useEffect(() => {
    if (!gridRef.current) return
    anime({
      targets: gridRef.current.querySelectorAll('.signal-card'),
      translateY: [40, 0],
      opacity: [0, 1],
      delay: anime.stagger(110, { start: 350 }),
      easing: 'easeOutExpo',
      duration: 700,
    })
  }, [breakdown])

  if (!breakdown) return null

  const order = ['ml', 'technical', 'fundamental', 'sentiment']
  const entries = order
    .filter((k) => breakdown[k])
    .map((k) => [k, breakdown[k]])

  return (
    <div className="signal-cards-section">
      <h2 className="section-title">🔬 What's driving the signal?</h2>
      <div ref={gridRef} className="signal-cards-grid">
        {entries.map(([key, val], i) => (
          <SignalCard
            key={key}
            sourceKey={key}
            sourceData={val}
            index={i}
          />
        ))}
      </div>
    </div>
  )
}