'use client'

import { useState, useEffect, useCallback } from 'react'
import { useAuth } from '@/lib/AuthContext'
import { useRouter } from 'next/navigation'
import { Flame, CheckCircle2, RotateCcw } from 'lucide-react'

const DHIKR_SEQUENCE = [
  {
    arabic: 'سُبْحَانَ اللَّهِ',
    transliteration: 'SubhanAllah',
    meaning: 'Glory be to Allah',
    target: 33,
    ring: '#10b981',        // emerald
    glow: 'rgba(16,185,129,0.25)',
    bg: 'rgba(16,185,129,0.08)',
  },
  {
    arabic: 'الْحَمْدُ لِلَّهِ',
    transliteration: 'Alhamdulillah',
    meaning: 'All praise is for Allah',
    target: 33,
    ring: '#3b82f6',        // blue
    glow: 'rgba(59,130,246,0.25)',
    bg: 'rgba(59,130,246,0.08)',
  },
  {
    arabic: 'اللَّهُ أَكْبَرُ',
    transliteration: 'Allahu Akbar',
    meaning: 'Allah is the Greatest',
    target: 34,
    ring: '#D4AF37',        // gold
    glow: 'rgba(212,175,55,0.3)',
    bg: 'rgba(212,175,55,0.08)',
  },
]

const TOTAL = DHIKR_SEQUENCE.reduce((s, d) => s + d.target, 0)

export default function DhikrPage() {
  const { user, token } = useAuth()
  const router = useRouter()
  const [phase, setPhase] = useState(0)
  const [count, setCount] = useState(0)
  const [totalCount, setTotalCount] = useState(0)
  const [streak, setStreak] = useState(0)
  const [todayCompleted, setTodayCompleted] = useState(false)
  const [justFinished, setJustFinished] = useState(false)
  const [loading, setLoading] = useState(true)
  const [ripple, setRipple] = useState(false)

  const current = DHIKR_SEQUENCE[phase]

  useEffect(() => {
    if (!token) { setLoading(false); return }
    fetch('/api/dhikr/status', { headers: { Authorization: `Bearer ${token}` } })
      .then(r => r.json())
      .then(d => {
        setStreak(d.streak ?? 0)
        setTodayCompleted(d.todayCompleted ?? false)
        if (d.todayCompleted) setTotalCount(TOTAL)
      })
      .catch(() => { })
      .finally(() => setLoading(false))
  }, [token])

  const handleTap = useCallback(async () => {
    if (todayCompleted || justFinished) return
    if (typeof navigator !== 'undefined' && 'vibrate' in navigator) navigator.vibrate(10)

    setRipple(true)
    setTimeout(() => setRipple(false), 300)

    const newCount = count + 1
    const newTotal = totalCount + 1
    setCount(newCount)
    setTotalCount(newTotal)

    if (newCount >= current.target) {
      if (phase < DHIKR_SEQUENCE.length - 1) {
        setTimeout(() => { setPhase(p => p + 1); setCount(0) }, 350)
      } else {
        setJustFinished(true)
        setTodayCompleted(true)
        if (token) {
          try {
            const res = await fetch('/api/dhikr/complete', {
              method: 'POST',
              headers: { 'Content-Type': 'application/json', Authorization: `Bearer ${token}` },
              body: JSON.stringify({ count: TOTAL }),
            })
            const data = await res.json()
            setStreak(data.streak ?? streak + 1)
          } catch { }
        }
      }
    }
  }, [count, totalCount, phase, current, token, todayCompleted, justFinished, streak])

  const handleReset = () => {
    setPhase(0); setCount(0); setTotalCount(0)
    setJustFinished(false); setTodayCompleted(false)
  }

  const progress = current ? count / current.target : 1
  const R = 58
  const C = 2 * Math.PI * R
  const strokeDashoffset = C * (1 - progress)

  if (!user) {
    return (
      <div className="min-h-dvh flex flex-col items-center justify-center bg-[#0a0a0f] px-6 pb-20">
        <div className="text-5xl mb-6">📿</div>
        <h2 className="text-xl font-bold text-white mb-2">Daily Dhikr</h2>
        <p className="text-gray-500 text-sm text-center mb-8">
          Build a daily habit of remembrance. Sign in to track your streak.
        </p>
        <button onClick={() => router.push('/login')}
          className="w-full max-w-xs bg-[#D4AF37] text-[#0a0a0f] py-4 rounded-2xl font-bold active:scale-[0.98] transition-all">
          Sign In
        </button>
      </div>
    )
  }

  if (loading) {
    return (
      <div className="min-h-dvh flex items-center justify-center bg-[#0a0a0f] pb-20">
        <div className="w-8 h-8 rounded-full border-2 border-[#D4AF37]/30 border-t-[#D4AF37] animate-spin" />
      </div>
    )
  }

  return (
    <div className="min-h-dvh bg-[#0a0a0f] flex flex-col pb-24 select-none">

      {/* Header */}
      <div className="px-5 pt-6 pb-2 flex items-center justify-between">
        <div>
          <h1 className="text-xl font-bold text-white">Daily Dhikr</h1>
          <p className="text-[11px] text-gray-700 mt-0.5">100 remembrances · after prayer</p>
        </div>
        <div className="flex items-center gap-1.5 bg-orange-500/10 border border-orange-500/20 rounded-xl px-3 py-2">
          <Flame size={14} className="text-orange-400" />
          <span className="text-sm font-bold text-orange-400">{streak}</span>
        </div>
      </div>

      {/* Phase progress dots */}
      <div className="flex gap-2 px-5 mt-4 mb-8">
        {DHIKR_SEQUENCE.map((d, i) => (
          <div
            key={i}
            className="flex-1 h-1 rounded-full transition-all duration-500"
            style={{
              background: i < phase ? d.ring : i === phase ? `${d.ring}99` : '#1a1a26',
            }}
          />
        ))}
      </div>

      {/* Completed today (not just-finished) */}
      {todayCompleted && !justFinished ? (
        <div className="flex-1 flex flex-col items-center justify-center px-6 text-center">
          <div className="w-28 h-28 rounded-full border-2 border-[#D4AF37]/30 bg-[#D4AF37]/8 flex items-center justify-center mb-6">
            <CheckCircle2 size={48} className="text-[#D4AF37]" />
          </div>
          <h2 className="text-2xl font-bold text-white mb-2">MashaAllah!</h2>
          <p className="text-gray-500 text-sm mb-5">You've completed your daily dhikr</p>
          <div className="flex items-center gap-2 bg-orange-500/10 border border-orange-500/20 rounded-2xl px-5 py-3">
            <Flame size={18} className="text-orange-400" />
            <span className="text-lg font-bold text-orange-400">{streak} day streak</span>
          </div>
          <button onClick={handleReset} className="mt-10 flex items-center gap-2 text-gray-600 text-sm">
            <RotateCcw size={13} /> Repeat again
          </button>
        </div>

      ) : justFinished ? (
        /* Completion screen */
        <div className="flex-1 flex flex-col items-center justify-center px-6 text-center">
          <div className="text-6xl mb-5">✨</div>
          <h2 className="text-3xl font-bold text-white mb-1">SubhanAllah!</h2>
          <p className="text-gray-400 text-sm mb-6">100 remembrances complete</p>
          <div className="flex items-center gap-2 bg-orange-500/10 border border-orange-500/20 rounded-2xl px-6 py-4 mb-8">
            <Flame size={22} className="text-orange-400" />
            <span className="text-2xl font-bold text-orange-400">{streak} day streak</span>
          </div>
          <div className="bg-gray-900/60 border border-gray-800 rounded-2xl px-5 py-4 max-w-xs">
            <p className="text-xs text-gray-500 leading-relaxed">
              &ldquo;Whoever says SubhanAllah 33 times, Alhamdulillah 33 times, and Allahu Akbar 34 times after each prayer…&rdquo;
            </p>
            <p className="text-[11px] text-gray-700 mt-2">— Sahih Muslim</p>
          </div>
          <button onClick={handleReset} className="mt-8 flex items-center gap-2 text-gray-600 text-sm">
            <RotateCcw size={13} /> Repeat again
          </button>
        </div>

      ) : (
        /* Main counter */
        <div className="flex-1 flex flex-col items-center justify-center px-6">
          {/* Ring counter */}
          <button
            onClick={handleTap}
            className="relative flex items-center justify-center active:scale-[0.96] transition-transform"
            style={{ WebkitTapHighlightColor: 'transparent' }}
            aria-label={`Tap to count ${current.transliteration}`}
          >
            {/* Outer glow ring */}
            <div
              className="absolute rounded-full transition-opacity duration-300"
              style={{
                width: 216, height: 216,
                background: `radial-gradient(circle, ${current.glow} 0%, transparent 70%)`,
                opacity: ripple ? 1 : 0.4,
              }}
            />

            {/* SVG progress ring */}
            <svg width="200" height="200" className="-rotate-90" style={{ filter: `drop-shadow(0 0 8px ${current.glow})` }}>
              {/* Track */}
              <circle cx="100" cy="100" r={R} fill="none" stroke="#1a1a26" strokeWidth="8" />
              {/* Progress */}
              <circle
                cx="100" cy="100" r={R} fill="none"
                stroke={current.ring}
                strokeWidth="8"
                strokeLinecap="round"
                strokeDasharray={C}
                strokeDashoffset={strokeDashoffset}
                className="transition-all duration-200"
              />
            </svg>

            {/* Center content */}
            <div
              className="absolute rounded-full flex flex-col items-center justify-center border border-white/5"
              style={{
                inset: 28,
                background: `radial-gradient(circle at 40% 30%, ${current.bg}, #0d0d18)`,
              }}
            >
              <span className="text-5xl font-bold text-white tabular-nums leading-none">{count}</span>
              <span className="text-[11px] text-gray-600 mt-1">of {current.target}</span>
            </div>
          </button>

          {/* Dhikr text */}
          <div className="text-center mt-10 space-y-2">
            <p className="text-3xl text-white leading-relaxed font-light">{current.arabic}</p>
            <p className="font-bold text-base" style={{ color: current.ring }}>{current.transliteration}</p>
            <p className="text-gray-600 text-sm">{current.meaning}</p>
          </div>

          <p className="text-gray-800 text-xs mt-10">Tap to count</p>
        </div>
      )}

      {/* Bottom progress */}
      {!justFinished && (
        <div className="px-5 pb-2">
          <div className="flex items-center justify-between text-[11px] text-gray-700 mb-2">
            <span>Total today</span>
            <span className="tabular-nums">{Math.min(totalCount, TOTAL)} / {TOTAL}</span>
          </div>
          <div className="h-1 bg-gray-900 rounded-full overflow-hidden">
            <div
              className="h-full rounded-full transition-all duration-300"
              style={{
                width: `${Math.min((totalCount / TOTAL) * 100, 100)}%`,
                background: 'linear-gradient(to right, #10b981, #3b82f6, #D4AF37)',
              }}
            />
          </div>
        </div>
      )}
    </div>
  )
}