'use client'

import { useState, useEffect, useMemo } from 'react'
import { type Milestone, type StatItem, MILESTONES, STATS, TODAY_POSITION } from './MilestonesSlide.data'
import { type Theme, MONO } from './MilestonesSlide.themes'

// ── Star Field ────────────────────────────────────────────────────────────────
export function StarField() {
  const stars = useMemo(() => {
    let s = 77
    const r = () => { s = (s * 9301 + 49297) % 233280; return s / 233280 }
    return Array.from({ length: 95 }, () => ({ x: r() * 100, y: r() * 100, size: r() * 1.4 + 0.3, op: r() * 0.5 + 0.15 }))
  }, [])
  return (
    <div style={{ position: 'absolute', inset: 0, pointerEvents: 'none' }}>
      {stars.map((st, i) => (
        <div key={i} style={{
          position: 'absolute', left: `${st.x}%`, top: `${st.y}%`,
          width: st.size, height: st.size, borderRadius: '50%',
          background: '#fff', opacity: st.op,
          boxShadow: `0 0 ${st.size * 3}px rgba(180,160,255,.7)`,
        }} />
      ))}
    </div>
  )
}

export function SoftGrid({ t }: { t: Theme }) {
  return (
    <div style={{
      position: 'absolute', inset: 0, pointerEvents: 'none',
      backgroundImage: `radial-gradient(${t.accent20} 1px, transparent 1px)`,
      backgroundSize: '28px 28px',
      maskImage: 'radial-gradient(ellipse at center, #000 40%, transparent 85%)',
      WebkitMaskImage: 'radial-gradient(ellipse at center, #000 40%, transparent 85%)',
      opacity: 0.8,
    }} />
  )
}

// ── Timeline ──────────────────────────────────────────────────────────────────
interface MilestoneWithPos extends Milestone { x: number; row: 'top' | 'bottom' }

export function Timeline({ onSelect, selectedId, t, de }: {
  onSelect: (m: Milestone) => void
  selectedId: string | null
  t: Theme
  de: boolean
}) {
  const trackW = 1160
  const innerPad = 120
  const usableW = trackW - innerPad * 2
  const positions = MILESTONES.map((_, i) => innerPad + (usableW * i) / (MILESTONES.length - 1))
  const todayX = innerPad + usableW * TODAY_POSITION

  const layout: MilestoneWithPos[] = MILESTONES.map((m, i) => ({
    ...m, x: positions[i],
    row: i % 2 === 0 ? 'top' : 'bottom',
  }))

  const railColor = t.key === 'dark' ? '#a78bfa' : '#7c3aed'

  return (
    <div style={{ position: 'relative', width: trackW, height: 360, margin: '0 auto' }}>
      <svg viewBox={`0 0 ${trackW} 360`} preserveAspectRatio="none"
        style={{ position: 'absolute', inset: 0, width: '100%', height: '100%' }}>
        <defs>
          <linearGradient id="msTrackBg" x1="0" x2="1">
            <stop offset="0"  stopColor={railColor} stopOpacity={t.key === 'dark' ? .18 : .28} />
            <stop offset=".5" stopColor={railColor} stopOpacity={t.key === 'dark' ? .28 : .38} />
            <stop offset="1"  stopColor={railColor} stopOpacity={t.key === 'dark' ? .18 : .28} />
          </linearGradient>
          <filter id="msGlow" x="-50%" y="-50%" width="200%" height="200%">
            <feGaussianBlur stdDeviation="3" result="b"/>
            <feMerge><feMergeNode in="b"/><feMergeNode in="SourceGraphic"/></feMerge>
          </filter>
        </defs>

        {/* rail background */}
        <line x1={innerPad} y1={180} x2={trackW - innerPad} y2={180}
          stroke="url(#msTrackBg)" strokeWidth="2.5" />
        {/* past progress */}
        <line x1={innerPad} y1={180} x2={todayX} y2={180}
          stroke={t.done} strokeWidth="3" opacity={t.key === 'dark' ? .85 : .9} />
        {/* future dashed */}
        <line x1={todayX} y1={180} x2={trackW - innerPad} y2={180}
          stroke="#f59e0b" strokeWidth="1.75" strokeDasharray="4 5"
          opacity={t.key === 'dark' ? .6 : .75}
          style={{ animation: 'msFlow 1.8s linear infinite' }} />

        {/* connector stubs */}
        {layout.map((m) => (
          <line key={m.id}
            x1={m.x} y1={180}
            x2={m.x} y2={m.row === 'top' ? 154 : 200}
            stroke={m.done ? t.done : m.tint}
            strokeOpacity={t.key === 'dark' ? (m.done ? .6 : .55) : (m.done ? .7 : .65)}
            strokeWidth="1"
            strokeDasharray={m.done ? '0' : '3 3'} />
        ))}

        {/* HEUTE marker -- circles only; pill is HTML below */}
        <g transform={`translate(${todayX} 180)`}>
          <circle r="14" fill={t.accent} opacity=".15" />
          <circle r="9" fill={t.accent} opacity=".4">
            <animate attributeName="r" values="9;14;9" dur="2s" repeatCount="indefinite" />
            <animate attributeName="opacity" values=".4;.05;.4" dur="2s" repeatCount="indefinite" />
          </circle>
          <circle r="6" fill={t.heuteCore} stroke={t.accent} strokeWidth="2" filter="url(#msGlow)" />
        </g>
      </svg>

      {/* HEUTE pill -- HTML so it sits above milestone cards */}
      <div style={{
        position: 'absolute',
        left: todayX - 30, top: 146,
        width: 60, height: 18,
        borderRadius: 9,
        background: t.heutePillBg,
        border: `1px solid ${t.accent}99`,
        display: 'flex', alignItems: 'center', justifyContent: 'center',
        zIndex: 10, pointerEvents: 'none',
        ...MONO, fontSize: 9.5, letterSpacing: 2.5, fontWeight: 700,
        color: t.heuteText,
      }}>HEUTE</div>

      {layout.map((m) => (
        <MilestoneNode key={m.id} m={m} t={t} de={de}
          onClick={() => onSelect(m)}
          active={selectedId === m.id} />
      ))}
    </div>
  )
}

function MilestoneNode({ m, onClick, active, t, de }: {
  m: MilestoneWithPos; onClick: () => void; active: boolean; t: Theme; de: boolean
}) {
  const [hover, setHover] = useState(false)
  const lit = hover || active
  const isTop = m.row === 'top'
  const cardY = isTop ? 4 : 200
  const nodeColor = m.done ? t.done : m.tint

  const bgTopA  = lit ? m.tint + t.cardTintTopH  : m.tint + t.cardTintTop
  const bgMidA  = lit ? m.tint + t.cardTintMidH  : m.tint + t.cardTintMid
  const cardBg  = `linear-gradient(180deg, ${bgTopA} 0%, ${bgMidA} 55%, ${t.cardBase}${lit ? t.cardBaseAH : t.cardBaseA})`
  const badge   = m.done ? (de ? 'erledigt' : 'done') : (m.next ? (de ? 'als n\u00e4chstes' : 'next') : (de ? 'geplant' : 'plan'))

  return (
    <>
      {/* dot */}
      <div
        onClick={onClick}
        onMouseEnter={() => setHover(true)}
        onMouseLeave={() => setHover(false)}
        style={{
          position: 'absolute', left: m.x - 14, top: 180 - 14,
          width: 28, height: 28, borderRadius: '50%',
          background: m.done
            ? `radial-gradient(circle at 35% 30%, ${t.doneBright}, ${t.doneSolid} 60%, ${t.doneDeep})`
            : `radial-gradient(circle at 35% 30%, ${m.tint}dd, ${m.tint}66 60%, ${t.dotTodoDeep})`,
          border: `2px solid ${lit ? '#fff' : nodeColor}`,
          boxShadow: lit
            ? `0 0 22px ${nodeColor}, 0 0 44px ${nodeColor}66, inset 0 1px 0 ${t.dotLitHi}`
            : `0 0 10px ${nodeColor}88, inset 0 1px 0 ${t.dotSoftHi}`,
          display: 'flex', alignItems: 'center', justifyContent: 'center',
          color: '#fff', fontSize: 11, fontWeight: 700,
          cursor: 'pointer', zIndex: 5,
          transition: 'all .25s',
          transform: lit ? 'scale(1.15)' : 'scale(1)',
        }}>
        {m.done ? '\u2713' : (m.next ? '\u25c9' : '\u25cb')}
      </div>

      {/* card */}
      <div
        onClick={onClick}
        onMouseEnter={() => setHover(true)}
        onMouseLeave={() => setHover(false)}
        style={{
          position: 'absolute', left: m.x - 112, top: cardY,
          width: 224, height: 150, padding: '12px 14px',
          borderRadius: 12,
          background: cardBg,
          border: `1px solid ${lit ? m.tint : m.tint + '55'}`,
          boxShadow: lit ? t.cardShadowLift(m.tint) : t.cardShadowSoft,
          cursor: 'pointer', zIndex: 4,
          transition: 'all .25s',
          transform: lit ? `translateY(${isTop ? -2 : 2}px)` : 'translateY(0)',
          display: 'flex', flexDirection: 'column', gap: 6,
          backdropFilter: t.key === 'light' ? 'blur(6px)' : 'none',
        }}>
        <div style={{ display: 'flex', alignItems: 'center', gap: 8 }}>
          <span style={{
            ...MONO, fontSize: 10, letterSpacing: 1.5, fontWeight: 700,
            color: m.done ? t.done : m.tint, textTransform: 'uppercase' as const,
          }}>{m.tick}</span>
          <span style={{ flex: 1, height: 1, background: `${m.tint}44` }} />
          <span style={{
            ...MONO, fontSize: 9, letterSpacing: 2, fontWeight: 700,
            color: m.done ? t.done : m.tint, textTransform: 'uppercase' as const, opacity: .85,
          }}>{badge}</span>
        </div>
        <div style={{ fontSize: 13, fontWeight: 700, color: t.fg, letterSpacing: -0.2, lineHeight: 1.25 }}>
          {de ? m.title.de : m.title.en}
        </div>
        <div style={{ fontSize: 10.5, lineHeight: 1.45, color: lit ? t.fgSoft : t.fgMuted, transition: 'color .25s' }}>
          {de ? m.short.de : m.short.en}
        </div>
        <div style={{
          marginTop: 'auto',
          display: 'flex', alignItems: 'center', justifyContent: 'space-between',
          paddingTop: 6, borderTop: `1px dashed ${m.tint}44`,
        }}>
          <span style={{ fontSize: 10, color: t.fgFaint }}>{m.when}</span>
          <span style={{
            fontSize: 10, color: m.tint, fontWeight: 700,
            opacity: lit ? 1 : 0.55,
            transform: `translateX(${lit ? 0 : -4}px)`,
            transition: 'all .25s',
          }}>{de ? 'Details \u2192' : 'Details \u2192'}</span>
        </div>
      </div>
    </>
  )
}

// ── Stat Card ─────────────────────────────────────────────────────────────────
export function StatCard({ item, t, de }: { item: StatItem; t: Theme; de: boolean }) {
  const [hover, setHover] = useState(false)
  const bgTop = hover ? item.tint + t.statTintTopH : item.tint + t.statTintTop
  const bgMid = item.tint + t.statTintMid
  return (
    <div
      onMouseEnter={() => setHover(true)}
      onMouseLeave={() => setHover(false)}
      style={{
        position: 'relative', padding: '14px 18px', borderRadius: 12,
        background: `linear-gradient(180deg, ${bgTop} 0%, ${bgMid} 60%, ${t.cardBase}${t.cardBaseA})`,
        border: `1px solid ${hover ? item.tint : item.tint + '55'}`,
        boxShadow: hover ? t.statShadowLift(item.tint) : t.statShadowSoft,
        transform: hover ? 'translateY(-3px)' : 'translateY(0)',
        transition: 'all .25s',
        overflow: 'hidden',
        backdropFilter: t.key === 'light' ? 'blur(6px)' : 'none',
      }}>
      <div style={{
        position: 'absolute', right: 10, top: 10, width: 6, height: 6,
        borderRadius: '50%', background: item.tint, opacity: .9,
        boxShadow: `0 0 10px ${item.tint}`,
      }} />
      <div style={{ ...MONO, fontSize: 9.5, letterSpacing: 2, color: item.tint, textTransform: 'uppercase' as const, fontWeight: 700, marginBottom: 6 }}>
        {de ? item.k.de : item.k.en}
      </div>
      <div style={{ fontSize: 32, fontWeight: 700, color: t.fg, letterSpacing: -0.8, lineHeight: 1 }}>
        {item.v}
      </div>
      <svg viewBox="0 0 100 16" preserveAspectRatio="none"
        style={{ width: '100%', height: 14, marginTop: 8, opacity: hover ? 1 : t.sparkOp, transition: 'opacity .25s' }}>
        <defs>
          <linearGradient id={`spark-${item.tint.replace('#', '')}`} x1="0" x2="1">
            <stop offset="0"   stopColor={item.tint} stopOpacity="0" />
            <stop offset=".5"  stopColor={item.tint} stopOpacity=".9" />
            <stop offset="1"   stopColor={item.tint} stopOpacity="0" />
          </linearGradient>
        </defs>
        <path d="M 0 10 L 15 8 L 30 11 L 48 6 L 62 9 L 78 4 L 100 2"
          stroke={`url(#spark-${item.tint.replace('#', '')})`} strokeWidth="1.5" fill="none" />
      </svg>
    </div>
  )
}

// ── Detail modal ──────────────────────────────────────────────────────────────
export function DetailModal({ item, onClose, t, de }: {
  item: Milestone | null; onClose: () => void; t: Theme; de: boolean
}) {
  useEffect(() => {
    if (!item) return
    const onKey = (e: KeyboardEvent) => { if (e.key === 'Escape') onClose() }
    window.addEventListener('keydown', onKey)
    return () => window.removeEventListener('keydown', onKey)
  }, [item, onClose])

  if (!item) return null
  const tint = item.tint
  const badge = item.done
    ? (de ? 'ABGESCHLOSSEN' : 'COMPLETED')
    : (item.next ? (de ? 'ALS N\u00c4CHSTES' : 'NEXT UP') : (de ? 'GEPLANT' : 'PLANNED'))
  const badgeColor = item.done ? t.done : tint

  return (
    <div onClick={onClose} style={{
      position: 'absolute', inset: 0, zIndex: 50,
      background: t.modalScrim, backdropFilter: 'blur(8px)',
      display: 'flex', alignItems: 'center', justifyContent: 'center',
      animation: 'msFadeIn .2s ease-out',
    }}>
      <div onClick={e => e.stopPropagation()} style={{
        width: 580, maxWidth: '88%',
        background: `linear-gradient(180deg, ${tint}22 0%, ${t.modalBgMid} 50%, ${t.modalBgLow} 100%)`,
        border: `1px solid ${tint}77`,
        borderRadius: 16,
        boxShadow: t.modalShadow(tint),
        padding: '24px 28px', color: t.fg,
        animation: 'msScaleIn .22s ease-out',
      }}>
        <div style={{ display: 'flex', alignItems: 'center', gap: 12, marginBottom: 16 }}>
          <div style={{
            width: 42, height: 42, borderRadius: 11,
            background: `linear-gradient(135deg, ${tint}66, ${tint}22)`,
            border: `1px solid ${tint}`,
            display: 'flex', alignItems: 'center', justifyContent: 'center',
            color: t.key === 'light' ? tint : '#fff', fontSize: 17, fontWeight: 700,
            boxShadow: `0 0 20px ${tint}66`,
          }}>{item.done ? '\u2713' : (item.next ? '\u25c9' : '\u25cb')}</div>
          <div style={{ flex: 1 }}>
            <div style={{ display: 'flex', alignItems: 'center', gap: 10, marginBottom: 4 }}>
              <span style={{
                ...MONO, fontSize: 9.5, letterSpacing: 2.5, color: badgeColor,
                textTransform: 'uppercase' as const, fontWeight: 700,
                padding: '2px 8px', borderRadius: 4,
                background: `${badgeColor}22`, border: `1px solid ${badgeColor}66`,
              }}>{badge}</span>
              <span style={{ ...MONO, fontSize: 10, color: t.fgFaint }}>{item.when}</span>
            </div>
            <div style={{ fontSize: 20, fontWeight: 700, color: t.fg, letterSpacing: -0.3 }}>
              {de ? item.title.de : item.title.en}
            </div>
          </div>
          <button onClick={onClose} style={{
            background: 'transparent', border: `1px solid ${tint}66`, color: t.fg,
            width: 32, height: 32, borderRadius: 8, cursor: 'pointer', fontSize: 14,
          }}>{'\u2715'}</button>
        </div>
        <div style={{ fontSize: 13, lineHeight: 1.6, color: t.fgSoft, marginBottom: 16 }}>
          {de ? item.body.de : item.body.en}
        </div>
        <div style={{ display: 'flex', flexDirection: 'column', gap: 8 }}>
          {(de ? item.bullets.de : item.bullets.en).map((b, i) => (
            <div key={i} style={{
              display: 'flex', alignItems: 'flex-start', gap: 10,
              padding: '9px 13px', borderRadius: 8,
              background: t.bulletBg, border: `1px solid ${tint}44`,
            }}>
              <span style={{ color: item.done ? t.done : tint, fontSize: 12, marginTop: 1 }}>
                {item.done ? '\u2713' : '\u25b8'}
              </span>
              <span style={{ fontSize: 12, lineHeight: 1.5, color: t.fgSoft }}>{b}</span>
            </div>
          ))}
        </div>
      </div>
    </div>
  )
}

// ── Inner slide (fixed 1280x600) ─────────────────────────────────────────────
export function MilestonesInner({ t, de, sel, setSel }: {
  t: Theme; de: boolean
  sel: Milestone | null
  setSel: (m: Milestone | null) => void
}) {
  const doneCnt = useMemo(() => MILESTONES.filter(m => m.done).length, [])
  const total = MILESTONES.length

  return (
    <div style={{
      position: 'relative', width: 1280, height: 600, overflow: 'hidden',
      background: t.bg, color: t.fg,
      fontFamily: '"Inter", system-ui, sans-serif', WebkitFontSmoothing: 'antialiased',
    }}>
      {/* Ambient glow */}
      <div style={{
        position: 'absolute', top: -120, left: '50%', transform: 'translateX(-50%)',
        width: 800, height: 500, borderRadius: '50%',
        background: t.ambient, filter: 'blur(50px)', pointerEvents: 'none',
      }} />

      {t.stars ? <StarField /> : <SoftGrid t={t} />}

      {/* Progress indicator */}
      <div style={{
        position: 'absolute', top: 36, right: 52, display: 'flex', alignItems: 'center', gap: 10, zIndex: 3,
      }}>
        <div style={{ ...MONO, fontSize: 10, letterSpacing: 2, color: t.fgMuted, textTransform: 'uppercase' as const, fontWeight: 700 }}>
          {de ? 'Fortschritt' : 'Progress'}
        </div>
        <div style={{
          width: 120, height: 6, background: t.progressTrackBg, borderRadius: 3, overflow: 'hidden',
          border: `1px solid ${t.progressTrackBorder}`,
        }}>
          <div style={{
            width: `${(doneCnt / total) * 100}%`, height: '100%',
            background: `linear-gradient(90deg, ${t.done}, ${t.accent})`,
            boxShadow: `0 0 12px ${t.done}99`,
          }} />
        </div>
        <div style={{ ...MONO, fontSize: 11, color: t.fg, fontWeight: 700 }}>
          <span style={{ color: t.done }}>{doneCnt}</span>
          <span style={{ color: t.fgWhisper }}> / {total}</span>
        </div>
      </div>

      {/* Tip */}
      <div style={{
        position: 'absolute', top: 36, left: 52, ...MONO, fontSize: 10,
        letterSpacing: 2, color: t.fgGhost, textTransform: 'uppercase' as const, fontWeight: 700,
        display: 'flex', alignItems: 'center', gap: 8, zIndex: 3,
      }}>
        <span>{de ? 'Tipp:' : 'Tip:'}</span>
        <span style={{ color: t.accent70 }}>{de ? 'Klick auf einen Meilenstein' : 'Click any milestone'}</span>
      </div>

      {/* Timeline */}
      <div style={{ position: 'relative', marginTop: 68 }}>
        <Timeline onSelect={setSel} selectedId={sel?.id ?? null} t={t} de={de} />
      </div>

      {/* Stats */}
      <div style={{
        position: 'absolute', left: 40, right: 40, bottom: 36,
        display: 'grid', gridTemplateColumns: 'repeat(5, 1fr)', gap: 14,
      }}>
        {STATS.map(s => <StatCard key={s.tint} item={s} t={t} de={de} />)}
      </div>

      {/* Footer */}
      <div style={{
        position: 'absolute', left: 0, right: 0, bottom: 14, textAlign: 'center',
        ...MONO, fontSize: 9, letterSpacing: 3, color: t.accent40,
        textTransform: 'uppercase' as const, fontWeight: 700,
      }}>
        {de ? 'Stand heute \u00b7 live-Metriken aus der Plattform' : 'As of today \u00b7 live metrics from the platform'}
      </div>

      <DetailModal item={sel} onClose={() => setSel(null)} t={t} de={de} />
    </div>
  )
}
