import { useState } from 'react';
import { motion, AnimatePresence } from 'framer-motion';
import {
  User,
  Bell,
  Shield,
  Database,
  Monitor,
  RefreshCw,
  Power,
  Server,
  Smartphone,
  Wifi,
  Copy,
  Check,
  ChevronDown,
  type LucideIcon,
} from 'lucide-react';
import { useStore } from '@/store/useStore';
import { useCurrency, CURRENCY_OPTIONS } from '@/store/useCurrencyStore';
import type { CurrencyCode } from '@/store/useCurrencyStore';

// ── Design tokens (matching inventory glassmorphism) ─────────────────────────
const GLASS = {
  background: 'rgba(14, 16, 21, 0.72)',
  border: '1px solid rgba(255,255,255,0.08)',
  backdropFilter: 'blur(18px)',
  WebkitBackdropFilter: 'blur(18px)',
} as const;

const INNER_SURFACE = {
  background: 'rgba(255,255,255,0.04)',
  border: '1px solid rgba(255,255,255,0.07)',
} as const;

// ── Shared primitives ────────────────────────────────────────────────────────

function GlassCard({
  children,
  delay = 0,
  className = '',
}: {
  children: React.ReactNode;
  delay?: number;
  className?: string;
}) {
  return (
    <motion.div
      className={`relative rounded-2xl ${className}`}
      style={GLASS}
      initial={{ opacity: 0, y: 16 }}
      animate={{ opacity: 1, y: 0 }}
      transition={{ duration: 0.35, delay }}
    >
      {children}
    </motion.div>
  );
}

function SectionHeader({ icon: Icon, title, accent = 'hsl(var(--accent))' }: { icon: LucideIcon; title: string; accent?: string }) {
  return (
    <div className="flex items-center gap-3 px-6 pt-6 pb-4 mb-2" style={{ borderBottom: '1px solid rgba(255,255,255,0.06)' }}>
      <div
        className="w-9 h-9 rounded-xl flex items-center justify-center flex-shrink-0"
        style={{ background: `${accent}22`, border: `1px solid ${accent}33` }}
      >
        <Icon className="w-4 h-4" style={{ color: accent }} />
      </div>
      <h3 className="text-white font-semibold text-base tracking-tight">{title}</h3>
    </div>
  );
}

function SettingsRow({
  label,
  description,
  children,
  danger = false,
}: {
  label: string;
  description?: string;
  children: React.ReactNode;
  danger?: boolean;
}) {
  return (
    <div
      className="flex items-center justify-between px-6 py-3.5"
      style={{ borderBottom: '1px solid rgba(255,255,255,0.04)' }}
    >
      <div className="flex-1 min-w-0 pr-4">
        <p className={`text-sm font-medium ${danger ? 'text-red-400' : 'text-white'}`}>{label}</p>
        {description && (
          <p className="text-xs mt-0.5" style={{ color: 'hsl(var(--muted-fg))' }}>{description}</p>
        )}
      </div>
      <div className="flex-shrink-0">{children}</div>
    </div>
  );
}

// ── Toggle ───────────────────────────────────────────────────────────────────
function Toggle({ enabled, onChange }: { enabled: boolean; onChange: (v: boolean) => void }) {
  return (
    <button
      type="button"
      onClick={() => onChange(!enabled)}
      className="relative w-11 h-6 rounded-full transition-colors duration-200 flex-shrink-0"
      style={{ background: enabled ? 'hsl(var(--accent))' : 'rgba(255,255,255,0.12)' }}
    >
      <motion.div
        className="absolute top-1 w-4 h-4 rounded-full bg-white shadow-sm"
        animate={{ left: enabled ? '24px' : '4px' }}
        transition={{ type: 'spring', stiffness: 500, damping: 32 }}
      />
    </button>
  );
}

// ── Dark Select ──────────────────────────────────────────────────────────────
function DarkSelect({
  value,
  onChange,
  options,
}: {
  value: string;
  onChange: (v: string) => void;
  options: { value: string; label: string }[];
}) {
  const [open, setOpen] = useState(false);
  const current = options.find((o) => o.value === value) ?? options[0];

  return (
    <div className="relative">
      <button
        type="button"
        onClick={() => setOpen((p) => !p)}
        className="flex items-center gap-2 rounded-xl px-3 py-2 text-sm text-white transition-colors min-w-[140px] justify-between"
        style={INNER_SURFACE}
      >
        <span>{current.label}</span>
        <ChevronDown
          className="w-3.5 h-3.5 transition-transform flex-shrink-0"
          style={{ color: 'hsl(var(--muted-fg))', transform: open ? 'rotate(180deg)' : 'rotate(0deg)' }}
        />
      </button>
      <AnimatePresence>
        {open && (
          <motion.div
            className="absolute right-0 top-full mt-1.5 z-50 rounded-xl overflow-hidden min-w-[160px]"
            style={{
              background: 'rgba(18,20,26,0.96)',
              border: '1px solid rgba(255,255,255,0.1)',
              backdropFilter: 'blur(24px)',
              WebkitBackdropFilter: 'blur(24px)',
              boxShadow: '0 16px 48px rgba(0,0,0,0.5)',
            }}
            initial={{ opacity: 0, y: -6, scale: 0.97 }}
            animate={{ opacity: 1, y: 0, scale: 1 }}
            exit={{ opacity: 0, y: -4, scale: 0.97 }}
            transition={{ duration: 0.15 }}
          >
            {options.map((opt) => (
              <button
                key={opt.value}
                type="button"
                onClick={() => { onChange(opt.value); setOpen(false); }}
                className="w-full text-left px-4 py-2.5 text-sm transition-colors"
                style={{
                  color: opt.value === value ? 'hsl(var(--accent))' : 'rgba(255,255,255,0.85)',
                  background: opt.value === value ? 'hsl(var(--accent) / 0.1)' : 'transparent',
                }}
                onMouseEnter={(e) => { if (opt.value !== value) (e.currentTarget as HTMLElement).style.background = 'rgba(255,255,255,0.06)'; }}
                onMouseLeave={(e) => { if (opt.value !== value) (e.currentTarget as HTMLElement).style.background = 'transparent'; }}
              >
                {opt.label}
              </button>
            ))}
          </motion.div>
        )}
      </AnimatePresence>
      {open && <div className="fixed inset-0 z-40" onClick={() => setOpen(false)} />}
    </div>
  );
}

// ── Ghost button ─────────────────────────────────────────────────────────────
function GhostButton({ children, onClick, danger = false }: { children: React.ReactNode; onClick?: () => void; danger?: boolean }) {
  return (
    <motion.button
      type="button"
      onClick={onClick}
      className="px-4 py-2 rounded-xl text-sm font-medium transition-colors"
      style={danger
        ? { background: 'rgba(239,68,68,0.12)', color: '#f87171', border: '1px solid rgba(239,68,68,0.2)' }
        : { ...INNER_SURFACE, color: 'rgba(255,255,255,0.8)' }
      }
      whileHover={{ scale: 1.02 }}
      whileTap={{ scale: 0.97 }}
    >
      {children}
    </motion.button>
  );
}

// ── Text input ───────────────────────────────────────────────────────────────
function DarkInput({ type = 'text', defaultValue, placeholder }: { type?: string; defaultValue?: string; placeholder?: string }) {
  return (
    <input
      type={type}
      defaultValue={defaultValue}
      placeholder={placeholder}
      className="rounded-xl px-3 py-2 text-sm text-white w-48 focus:outline-none transition-all"
      style={{
        ...INNER_SURFACE,
        caretColor: 'hsl(var(--accent))',
      }}
      onFocus={(e) => { e.currentTarget.style.border = '1px solid hsl(var(--accent) / 0.4)'; }}
      onBlur={(e) => { e.currentTarget.style.border = '1px solid rgba(255,255,255,0.07)'; }}
    />
  );
}

// ── System Status ────────────────────────────────────────────────────────────
function SystemStatusCard() {
  const { status, updateStatus } = useStore();

  return (
    <GlassCard delay={0}>
      <SectionHeader icon={Server} title="System Status" />
      <div className="px-6 pb-6 space-y-3">
        {/* Connection pill */}
        <div className="flex items-center justify-between p-4 rounded-xl" style={INNER_SURFACE}>
          <div className="flex items-center gap-3">
            <div className="relative w-3 h-3">
              <div className={`w-3 h-3 rounded-full ${status.isConnected ? 'bg-green-500' : 'bg-red-500'}`} />
              {status.isConnected && <div className="absolute inset-0 rounded-full bg-green-500 status-pulse" />}
            </div>
            <div>
              <p className="text-white text-sm font-medium">Backend Connection</p>
              <p className="text-xs mt-0.5" style={{ color: 'hsl(var(--muted-fg))' }}>
                {status.isConnected ? 'Connected to local server' : 'Connection lost'}
              </p>
            </div>
          </div>
          <span
            className="px-2.5 py-1 rounded-full text-[11px] font-medium"
            style={status.isConnected
              ? { background: 'rgba(34,197,94,0.15)', color: '#86efac' }
              : { background: 'rgba(239,68,68,0.15)', color: '#fca5a5' }
            }
          >
            {status.serverStatus.toUpperCase()}
          </span>
        </div>

        {/* Version / sync grid */}
        <div className="grid grid-cols-2 gap-3">
          {[
            { label: 'Version', value: status.version },
            { label: 'Last Sync', value: status.lastSync.toLocaleTimeString() },
          ].map(({ label, value }) => (
            <div key={label} className="p-3 rounded-xl" style={INNER_SURFACE}>
              <p className="text-xs mb-1" style={{ color: 'hsl(var(--muted-fg))' }}>{label}</p>
              <p className="text-white text-sm font-medium">{value}</p>
            </div>
          ))}
        </div>

        {/* Actions */}
        <div className="flex gap-3">
          <motion.button
            type="button"
            className="flex-1 py-2.5 rounded-xl text-sm font-medium flex items-center justify-center gap-2 transition-colors"
            style={INNER_SURFACE}
            whileHover={{ scale: 1.02 }}
            whileTap={{ scale: 0.97 }}
            onClick={() => updateStatus({ serverStatus: 'syncing' })}
          >
            <RefreshCw className="w-4 h-4" style={{ color: 'hsl(var(--accent))' }} />
            <span className="text-white">Sync Now</span>
          </motion.button>
          <motion.button
            type="button"
            className="flex-1 py-2.5 rounded-xl text-sm font-medium flex items-center justify-center gap-2 transition-colors"
            style={INNER_SURFACE}
            whileHover={{ scale: 1.02 }}
            whileTap={{ scale: 0.97 }}
          >
            <Power className="w-4 h-4" style={{ color: 'hsl(var(--muted-fg))' }} />
            <span className="text-white">Restart</span>
          </motion.button>
        </div>
      </div>
    </GlassCard>
  );
}

// ── iOS Device Connection ────────────────────────────────────────────────────
function IOSConnectionCard() {
  const [paired, setPaired] = useState(false);
  const [pairing, setPairing] = useState(false);
  const [copied, setCopied] = useState(false);
  const pairingCode = 'VLC-7F3A-9B2D';
  const deviceIp = '192.168.1.42:8765';

  const handlePair = () => {
    setPairing(true);
    setTimeout(() => { setPairing(false); setPaired(true); }, 2000);
  };

  const handleCopy = (text: string) => {
    void navigator.clipboard.writeText(text);
    setCopied(true);
    setTimeout(() => setCopied(false), 1800);
  };

  return (
    <GlassCard delay={0.05}>
      <SectionHeader icon={Smartphone} title="iOS App / Device" accent="#a78bfa" />
      <div className="px-6 pb-6 space-y-3">

        {/* Status */}
        <div className="flex items-center justify-between p-4 rounded-xl" style={INNER_SURFACE}>
          <div className="flex items-center gap-3">
            <div className="relative w-3 h-3">
              <div className={`w-3 h-3 rounded-full ${paired ? 'bg-green-500' : 'bg-zinc-500'}`} />
              {paired && <div className="absolute inset-0 rounded-full bg-green-500 status-pulse" />}
            </div>
            <div>
              <p className="text-white text-sm font-medium">{paired ? 'iPhone Paired' : 'No Device Paired'}</p>
              <p className="text-xs mt-0.5" style={{ color: 'hsl(var(--muted-fg))' }}>
                {paired ? "Ahmed’s iPhone 15 Pro" : 'Open Velocity iOS app to connect'}
              </p>
            </div>
          </div>
          {paired
            ? <span className="px-2.5 py-1 rounded-full text-[11px] font-medium" style={{ background: 'rgba(34,197,94,0.15)', color: '#86efac' }}>CONNECTED</span>
            : <Wifi className="w-4 h-4" style={{ color: 'hsl(var(--muted-fg))' }} />
          }
        </div>

        {/* Pairing code */}
        <div className="p-4 rounded-xl space-y-3" style={INNER_SURFACE}>
          <p className="text-xs font-medium uppercase tracking-widest" style={{ color: 'hsl(var(--muted-fg))' }}>Pairing Code</p>
          <div className="flex items-center justify-between">
            <p className="text-2xl font-bold tracking-[0.2em] text-white font-mono">{pairingCode}</p>
            <button
              type="button"
              onClick={() => handleCopy(pairingCode)}
              className="p-2 rounded-lg transition-colors"
              style={{ background: 'rgba(255,255,255,0.06)' }}
            >
              {copied ? <Check className="w-4 h-4 text-green-400" /> : <Copy className="w-4 h-4" style={{ color: 'hsl(var(--muted-fg))' }} />}
            </button>
          </div>
          <div className="flex items-center gap-2">
            <p className="text-xs" style={{ color: 'hsl(var(--muted-fg))' }}>Local IP: <span className="text-white font-mono">{deviceIp}</span></p>
            <button type="button" onClick={() => handleCopy(deviceIp)} className="p-1 rounded transition-colors hover:opacity-70">
              <Copy className="w-3 h-3" style={{ color: 'hsl(var(--muted-fg))' }} />
            </button>
          </div>
        </div>

        {/* Actions */}
        <div className="flex gap-3">
          <motion.button
            type="button"
            onClick={handlePair}
            disabled={pairing || paired}
            className="flex-1 py-2.5 rounded-xl text-sm font-semibold flex items-center justify-center gap-2 transition-all"
            style={paired
              ? { background: 'rgba(34,197,94,0.15)', color: '#86efac', border: '1px solid rgba(34,197,94,0.2)' }
              : { background: 'hsl(var(--accent))', color: 'hsl(var(--accent-fg))' }
            }
            whileHover={!paired ? { scale: 1.02 } : {}}
            whileTap={!paired ? { scale: 0.97 } : {}}
          >
            {pairing ? (
              <><RefreshCw className="w-4 h-4 animate-spin" /> Pairing…</>
            ) : paired ? (
              <><Check className="w-4 h-4" /> Paired</>
            ) : (
              <><Smartphone className="w-4 h-4" /> Pair Device</>
            )}
          </motion.button>
          {paired && (
            <GhostButton onClick={() => setPaired(false)} danger>Unpair</GhostButton>
          )}
        </div>

        {/* Push notifications toggle */}
        <div className="flex items-center justify-between pt-1">
          <div>
            <p className="text-sm font-medium text-white">Push Notifications</p>
            <p className="text-xs mt-0.5" style={{ color: 'hsl(var(--muted-fg))' }}>Send alerts to paired iPhone</p>
          </div>
          <Toggle enabled={paired} onChange={() => { }} />
        </div>
      </div>
    </GlassCard>
  );
}

// ── Profile ──────────────────────────────────────────────────────────────────
function ProfileSettings() {
  const { user } = useStore();
  const initials = user?.name.split(' ').map((n) => n[0]).join('') ?? 'AA';

  return (
    <GlassCard delay={0.1}>
      <SectionHeader icon={User} title="Profile" />
      <div className="px-6 pb-6">
        <div className="flex items-center gap-4 mb-5 p-4 rounded-xl" style={INNER_SURFACE}>
          <div
            className="w-14 h-14 rounded-full flex items-center justify-center flex-shrink-0 text-white text-lg font-bold"
            style={{ background: 'hsl(var(--accent))', boxShadow: '0 0 20px hsl(var(--accent) / 0.3)' }}
          >
            {initials}
          </div>
          <div>
            <p className="text-white font-semibold">{user?.name}</p>
            <p className="text-xs mt-0.5" style={{ color: 'hsl(var(--muted-fg))' }}>
              {user?.role === 'sales_director' ? 'Sales Director' : 'Administrator'}
            </p>
          </div>
        </div>
        <div className="space-y-0 -mx-6">
          <SettingsRow label="Full Name" description="Your display name">
            <DarkInput defaultValue={user?.name} />
          </SettingsRow>
          <SettingsRow label="Email" description="Notification email">
            <DarkInput type="email" defaultValue="ahmed@velocity.re" />
          </SettingsRow>
          <SettingsRow label="Phone" description="Contact number">
            <DarkInput type="tel" defaultValue="+971 50 123 4567" />
          </SettingsRow>
        </div>
      </div>
    </GlassCard>
  );
}

// ── Notifications ────────────────────────────────────────────────────────────
function NotificationSettings() {
  const [s, setS] = useState({ newLeads: true, sentimentAlerts: true, viewings: true, systemUpdates: false, emailDigest: true });
  const rows: { key: keyof typeof s; label: string; desc: string }[] = [
    { key: 'newLeads', label: 'New Lead Alerts', desc: 'Get notified when a new lead is captured' },
    { key: 'sentimentAlerts', label: 'Sentiment Alerts', desc: 'Alert when visitor sentiment drops' },
    { key: 'viewings', label: 'Viewing Reminders', desc: 'Reminders for scheduled viewings' },
    { key: 'systemUpdates', label: 'System Updates', desc: 'Notifications about system maintenance' },
    { key: 'emailDigest', label: 'Daily Email Digest', desc: 'Summary of daily activity' },
  ];

  return (
    <GlassCard delay={0.15}>
      <SectionHeader icon={Bell} title="Notifications" />
      <div className="-mx-0">
        {rows.map(({ key, label, desc }) => (
          <SettingsRow key={key} label={label} description={desc}>
            <Toggle enabled={s[key]} onChange={(v) => setS({ ...s, [key]: v })} />
          </SettingsRow>
        ))}
      </div>
    </GlassCard>
  );
}

// ── Security ─────────────────────────────────────────────────────────────────
function SecuritySettings() {
  const [twoFactor, setTwoFactor] = useState(true);
  const [biometric, setBiometric] = useState(true);
  const [timeout, setTimeout_] = useState('30');

  return (
    <GlassCard delay={0.2}>
      <SectionHeader icon={Shield} title="Security" accent="#f59e0b" />
      <div>
        <SettingsRow label="Two-Factor Authentication" description="Require OTP for login">
          <Toggle enabled={twoFactor} onChange={setTwoFactor} />
        </SettingsRow>
        <SettingsRow label="Biometric Login" description="Use FaceID for authentication">
          <Toggle enabled={biometric} onChange={setBiometric} />
        </SettingsRow>
        <SettingsRow label="Change Password" description="Update your password">
          <GhostButton>Change</GhostButton>
        </SettingsRow>
        <SettingsRow label="API Keys" description="Manage API access">
          <GhostButton>Manage</GhostButton>
        </SettingsRow>
        <SettingsRow label="Session Timeout" description="Auto-logout after inactivity">
          <DarkSelect
            value={timeout}
            onChange={setTimeout_}
            options={[
              { value: '15', label: '15 minutes' },
              { value: '30', label: '30 minutes' },
              { value: '60', label: '1 hour' },
              { value: 'never', label: 'Never' },
            ]}
          />
        </SettingsRow>
      </div>
    </GlassCard>
  );
}

// ── Display ──────────────────────────────────────────────────────────────────
function DisplaySettings() {
  const [reducedMotion, setReducedMotion] = useState(false);
  const [compactMode, setCompactMode] = useState(false);
  const [language, setLanguage] = useState('en');
  const [timezone, setTimezone] = useState('dxb');
  const { currency, setCurrency } = useCurrency();

  return (
    <GlassCard delay={0.25}>
      <SectionHeader icon={Monitor} title="Display" />
      <div>
        <SettingsRow label="Reduced Motion" description="Minimize animations">
          <Toggle enabled={reducedMotion} onChange={setReducedMotion} />
        </SettingsRow>
        <SettingsRow label="Compact Mode" description="Show more content per screen">
          <Toggle enabled={compactMode} onChange={setCompactMode} />
        </SettingsRow>
        <SettingsRow label="Language" description="Interface language">
          <DarkSelect
            value={language}
            onChange={setLanguage}
            options={[
              { value: 'en', label: 'English' },
              { value: 'ar', label: 'العربية' },
            ]}
          />
        </SettingsRow>
        <SettingsRow label="Timezone" description="Local time display">
          <DarkSelect
            value={timezone}
            onChange={setTimezone}
            options={[
              { value: 'dxb', label: 'Dubai (GMT+4)' },
              { value: 'ruh', label: 'Riyadh (GMT+3)' },
              { value: 'lon', label: 'London (GMT+0)' },
            ]}
          />
        </SettingsRow>

        {/* ── Currency ── */}
        <SettingsRow
          label="Currency"
          description="Default currency shown across the entire app"
        >
          <DarkSelect
            value={currency}
            onChange={(v) => setCurrency(v as CurrencyCode)}
            options={CURRENCY_OPTIONS.map((o) => ({
              value: o.code,
              label: `${o.flag}  ${o.symbol} — ${o.label}`,
            }))}
          />
        </SettingsRow>
      </div>
    </GlassCard>
  );
}

// ── Data & Privacy ───────────────────────────────────────────────────────────
function DataSettings() {
  const [retention, setRetention] = useState('90');

  return (
    <GlassCard delay={0.3}>
      <SectionHeader icon={Database} title="Data & Privacy" />
      <div>
        <SettingsRow label="Auto-Backup" description="Automatically backup data daily">
          <Toggle enabled={true} onChange={() => { }} />
        </SettingsRow>
        <SettingsRow label="Data Retention" description="How long to keep visitor data">
          <DarkSelect
            value={retention}
            onChange={setRetention}
            options={[
              { value: '30', label: '30 days' },
              { value: '90', label: '90 days' },
              { value: '180', label: '6 months' },
              { value: '365', label: '1 year' },
            ]}
          />
        </SettingsRow>
        <SettingsRow label="Export Data" description="Download all your data">
          <GhostButton>Export</GhostButton>
        </SettingsRow>
        <SettingsRow label="Clear Cache" description="Remove temporary files" danger>
          <GhostButton danger>Clear</GhostButton>
        </SettingsRow>
      </div>
    </GlassCard>
  );
}

// ── About ────────────────────────────────────────────────────────────────────
function AboutSection() {
  return (
    <GlassCard delay={0.35}>
      <SectionHeader icon={Wifi} title="About" />
      <div className="px-6 pb-6 text-center">
        <div
          className="w-16 h-16 rounded-2xl flex items-center justify-center mx-auto mb-4 text-white text-2xl font-bold"
          style={{ background: 'hsl(var(--accent))', boxShadow: '0 0 28px hsl(var(--accent) / 0.35)' }}
        >
          V
        </div>
        <h4 className="text-white font-semibold text-lg mb-1">Velocity WebOS</h4>
        <p className="text-sm mb-4" style={{ color: 'hsl(var(--muted-fg))' }}>Real Estate Operating System</p>
        <div className="flex items-center justify-center gap-2 text-xs mb-6" style={{ color: 'hsl(var(--subtle-fg))' }}>
          <span>Version 2.1.0</span>
          <span>•</span>
          <span>Build 2024.02.18</span>
        </div>
        <div className="flex items-center justify-center gap-4">
          {['Terms of Service', 'Privacy Policy', 'Documentation'].map((label) => (
            <button key={label} type="button" className="text-sm transition-colors hover:opacity-80" style={{ color: 'hsl(var(--accent))' }}>
              {label}
            </button>
          ))}
        </div>
      </div>
    </GlassCard>
  );
}

// ── Main ─────────────────────────────────────────────────────────────────────
export function Settings() {
  return (
    <div className="space-y-4">
      {/* Row 1: System + iOS */}
      <div className="grid grid-cols-2 gap-4 relative z-40">
        <SystemStatusCard />
        <IOSConnectionCard />
      </div>

      {/* Row 2: Profile + Notifications */}
      <div className="grid grid-cols-2 gap-4 relative z-30">
        <ProfileSettings />
        <NotificationSettings />
      </div>

      {/* Row 3: Security + Display */}
      <div className="grid grid-cols-2 gap-4 relative z-20">
        <SecuritySettings />
        <DisplaySettings />
      </div>

      {/* Row 4: Data + About */}
      <div className="grid grid-cols-2 gap-4 relative z-10">
        <DataSettings />
        <AboutSection />
      </div>
    </div>
  );
}