import { useState, useRef, useEffect } from 'react'
import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query'
import toast from 'react-hot-toast'
import client from '../api/client'
import { ConfirmModal } from '../ui/Modal'
import Button from '../ui/Button'


function avatarColor(name) {
  const palette = ['#3758c9', '#7a44c9', '#2f9e5e', '#d94b26', '#8a6d2b', '#0d7a8a', '#c93775']
  let h = 0
  for (let i = 0; i < name.length; i++) h = (h * 31 + name.charCodeAt(i)) >>> 0
  return palette[h % palette.length]
}

function WaiterAvatar({ waiter, size = 40 }) {
  const displayName = waiter.full_name || waiter.nickname || waiter.username
  if (waiter.avatar_url) {
    return (
      <img
        src={waiter.avatar_url}
        alt={displayName}
        style={{ width: size, height: size, borderRadius: '50%', objectFit: 'cover', flexShrink: 0 }}
      />
    )
  }
  const parts = displayName.trim().split(' ')
  const initials = (parts[0][0] + (parts[1]?.[0] || '')).toUpperCase()
  return (
    <div style={{
      width: size, height: size, borderRadius: '50%',
      background: avatarColor(displayName),
      color: 'white', fontSize: size * 0.38, fontWeight: 600,
      display: 'flex', alignItems: 'center', justifyContent: 'center',
      flexShrink: 0,
    }}>{initials}</div>
  )
}

const DIGITS = ['1','2','3','4','5','6','7','8','9','','0','⌫']

function PinInput({ value, onChange }) {
  function press(d) {
    if (d === '⌫') { onChange(value.slice(0, -1)); return }
    if (d === '' || value.length >= 6) return
    onChange(value + d)
  }
  return (
    <div style={{ display: 'flex', flexDirection: 'column', gap: 14, alignItems: 'center' }}>
      <div style={{ display: 'flex', gap: 10 }}>
        {Array.from({ length: 4 }).map((_, i) => (
          <div key={i} style={{
            width: 13, height: 13, borderRadius: '50%',
            border: `2px solid ${i < value.length ? '#111827' : '#d1d5db'}`,
            background: i < value.length ? '#111827' : 'transparent',
            transition: 'all 150ms',
          }} />
        ))}
      </div>
      <div style={{ display: 'grid', gridTemplateColumns: 'repeat(3, 1fr)', gap: 8, width: '100%' }}>
        {DIGITS.map((d, i) => (
          <button
            key={i} type="button" onClick={() => press(d)} disabled={d === ''}
            style={{
              height: 46, borderRadius: 10, fontSize: 18, fontWeight: 600, border: 'none',
              cursor: d === '' ? 'default' : 'pointer',
              background: d === '' ? 'transparent' : d === '⌫' ? '#f3f4f6' : '#f8fafc',
              color: d === '⌫' ? '#6b7280' : '#111827',
              transition: 'background 100ms',
              visibility: d === '' ? 'hidden' : 'visible',
            }}
          >
            {d}
          </button>
        ))}
      </div>
    </div>
  )
}

// ── Actions dropdown menu ─────────────────────────────────────────────────────
function ActionsMenu({ waiter, onEdit, onZones, onResetPin, onBlock, onDelete }) {
  const [open, setOpen] = useState(false)
  const ref = useRef(null)

  useEffect(() => {
    if (!open) return
    function handler(e) {
      if (ref.current && !ref.current.contains(e.target)) setOpen(false)
    }
    document.addEventListener('mousedown', handler)
    return () => document.removeEventListener('mousedown', handler)
  }, [open])

  const items = [
    { label: 'Επεξεργασία', icon: editIcon, onClick: onEdit },
    waiter.role === 'waiter' && { label: 'Πρόσβαση σε Ζώνες', icon: zonesIcon, onClick: onZones },
    { label: 'Επαναφορά PIN', icon: pinIcon, onClick: onResetPin },
    { label: waiter.is_active ? 'Μπλοκάρισμα' : 'Ξεμπλοκάρισμα', icon: blockIcon, onClick: onBlock, color: waiter.is_active ? '#f97316' : '#22c55e' },
    { label: 'Διαγραφή', icon: trashIcon, onClick: onDelete, color: '#ef4444' },
  ].filter(Boolean)

  return (
    <div ref={ref} style={{ position: 'relative' }}>
      <button
        onClick={() => setOpen(v => !v)}
        style={{
          display: 'flex', alignItems: 'center', gap: 6,
          fontSize: 13, padding: '0 12px', height: 34, borderRadius: 8,
          border: '1px solid #e5e7eb', background: open ? '#f3f4f6' : '#fff',
          color: '#374151', fontWeight: 500, cursor: 'pointer',
          transition: 'background 120ms',
        }}
      >
        Ενέργειες
        <svg width="12" height="12" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2.5" strokeLinecap="round" strokeLinejoin="round">
          <path d="M6 9l6 6 6-6" />
        </svg>
      </button>

      {open && (
        <div style={{
          position: 'absolute', right: 0, top: 'calc(100% + 6px)', zIndex: 100,
          background: '#fff', border: '1px solid #e5e7eb',
          borderRadius: 12, boxShadow: '0 8px 24px rgba(0,0,0,0.12)',
          minWidth: 200, overflow: 'hidden', padding: '4px 0',
        }}>
          {items.map((item, i) => (
            <button
              key={i}
              onClick={() => { setOpen(false); item.onClick() }}
              style={{
                display: 'flex', alignItems: 'center', gap: 10,
                width: '100%', padding: '9px 14px', border: 'none',
                background: 'transparent', cursor: 'pointer', textAlign: 'left',
                fontSize: 13.5, fontWeight: 500,
                color: item.color || '#111827',
                transition: 'background 80ms',
              }}
              onMouseEnter={e => e.currentTarget.style.background = item.color ? `${item.color}10` : '#f9fafb'}
              onMouseLeave={e => e.currentTarget.style.background = 'transparent'}
            >
              <span style={{ color: item.color || '#6b7280', display: 'flex', flexShrink: 0 }}>{item.icon}</span>
              {item.label}
            </button>
          ))}
        </div>
      )}
    </div>
  )
}

const editIcon = (
  <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round">
    <path d="M12 20h9" /><path d="M16.5 3.5a2.121 2.121 0 0 1 3 3L7 19l-4 1 1-4L16.5 3.5z" />
  </svg>
)
const zonesIcon = (
  <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round">
    <path d="M3 7a2 2 0 0 1 2-2h4l2 2h8a2 2 0 0 1 2 2v9a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2z" />
  </svg>
)
const pinIcon = (
  <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round">
    <rect x="3" y="11" width="18" height="11" rx="2" /><path d="M7 11V7a5 5 0 0 1 10 0v4" />
  </svg>
)
const blockIcon = (
  <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round">
    <circle cx="12" cy="12" r="10" /><line x1="4.93" y1="4.93" x2="19.07" y2="19.07" />
  </svg>
)
const trashIcon = (
  <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round">
    <path d="M3 6h18" /><path d="M8 6V4h8v2M19 6l-1 14a2 2 0 0 1-2 2H8a2 2 0 0 1-2-2L5 6" />
  </svg>
)

// ── ZoneModal ─────────────────────────────────────────────────────────────────
function ZoneModal({ waiter, groups, onClose }) {
  const qc = useQueryClient()
  const hasAllZones = waiter.zone_assignments.some(z => z.group_id === null)
  const assignedIds = new Set(waiter.zone_assignments.map(z => z.group_id).filter(id => id !== null))
  const [allZones, setAllZones] = useState(hasAllZones)
  const [selected, setSelected] = useState(new Set(assignedIds))

  const saveZones = useMutation({
    mutationFn: (body) => client.put(`/api/waiters/${waiter.id}/zones`, body),
    onSuccess: () => { toast.success('Zones ενημερώθηκαν'); qc.invalidateQueries({ queryKey: ['waiters'] }); onClose() },
    onError: () => toast.error('Σφάλμα'),
  })

  function toggleGroup(gid) {
    setSelected(prev => { const next = new Set(prev); next.has(gid) ? next.delete(gid) : next.add(gid); return next })
  }

  return (
    <div className="fixed inset-0 bg-black/40 flex items-center justify-center z-50 p-4">
      <div className="bg-white rounded-2xl shadow-xl w-full max-w-sm p-6 space-y-4">
        <h2 className="font-bold text-gray-800">Ζώνες — {waiter.username}</h2>
        <label className="flex items-center gap-3 cursor-pointer select-none">
          <input type="checkbox" className="w-5 h-5 rounded accent-primary-700" checked={allZones}
            onChange={e => { setAllZones(e.target.checked); if (e.target.checked) setSelected(new Set()) }} />
          <span className="font-semibold text-gray-700">Όλες οι ζώνες</span>
        </label>
        {!allZones && (
          <div className="space-y-2 max-h-60 overflow-y-auto">
            {groups.length === 0 && <p className="text-sm text-gray-400">Δεν υπάρχουν ομάδες τραπεζιών.</p>}
            {groups.map(g => (
              <label key={g.id} className="flex items-center gap-3 cursor-pointer select-none px-1">
                <input type="checkbox" className="w-5 h-5 rounded accent-primary-700" checked={selected.has(g.id)} onChange={() => toggleGroup(g.id)} />
                <span className="text-gray-700">{g.name}</span>
                {g.color && <span className="w-3 h-3 rounded-full inline-block ml-auto" style={{ background: g.color }} />}
              </label>
            ))}
          </div>
        )}
        {!allZones && selected.size === 0 && (
          <p className="text-xs text-amber-600 bg-amber-50 rounded px-3 py-1.5">Χωρίς επιλογή ο σερβιτόρος δεν βλέπει κανένα τραπέζι.</p>
        )}
        <div className="flex gap-3 pt-2">
          <button onClick={onClose} className="flex-1 btn btn-secondary">Ακύρωση</button>
          <button onClick={() => saveZones.mutate(allZones ? { all_zones: true, group_ids: [] } : { all_zones: false, group_ids: [...selected] })}
            disabled={saveZones.isPending} className="flex-1 btn btn-primary">Αποθήκευση</button>
        </div>
      </div>
    </div>
  )
}

// ── Shared form primitives ────────────────────────────────────────────────────
function FormField({ label, required, desc, children }) {
  return (
    <div style={{ display: 'flex', flexDirection: 'column', gap: 3 }}>
      <label style={{ fontSize: 11.5, fontWeight: 600, color: '#374151' }}>
        {label}{required && <span style={{ color: '#ef4444', marginLeft: 2 }}>*</span>}
      </label>
      {children}
      {desc && <p style={{ margin: 0, fontSize: 11, color: '#9ca3af', lineHeight: 1.4 }}>{desc}</p>}
    </div>
  )
}

function SectionLabel({ children }) {
  return (
    <div style={{ fontSize: 10, fontWeight: 700, letterSpacing: '0.08em', textTransform: 'uppercase', color: '#9ca3af', marginBottom: 10 }}>
      {children}
    </div>
  )
}

function InfoBlock({ label, value, valueColor }) {
  return (
    <div style={{ display: 'flex', flexDirection: 'column', gap: 1 }}>
      <span style={{ fontSize: 10.5, fontWeight: 600, color: '#9ca3af', textTransform: 'uppercase', letterSpacing: '0.05em' }}>{label}</span>
      <span style={{ fontSize: 13.5, fontWeight: 500, color: valueColor || '#111827' }}>{value || '—'}</span>
    </div>
  )
}

const inputStyle = {
  width: '100%', padding: '7px 10px', border: '1px solid #e5e7eb', borderRadius: 7,
  fontSize: 13, outline: 'none', color: '#111827', background: '#fff', boxSizing: 'border-box',
}

const EMPTY_FORM = { username: '', full_name: '', nickname: '', mobile_phone: '', email: '', note: '', role: 'waiter', pin: '', hourly_rate: '' }

// ── Main page ─────────────────────────────────────────────────────────────────
export default function WaitersPage() {
  const qc = useQueryClient()
  const [addModal, setAddModal] = useState(false)
  const [pinModal, setPinModal] = useState(null)
  const [zoneModal, setZoneModal] = useState(null)
  const [confirmDelete, setConfirmDelete] = useState(null)
  const [newPin, setNewPin] = useState('')
  const [newForm, setNewForm] = useState(EMPTY_FORM)
  const [newAvatarFile, setNewAvatarFile] = useState(null)
  const [newAvatarPreview, setNewAvatarPreview] = useState(null)
  const [editModal, setEditModal] = useState(null)
  const [editForm, setEditForm] = useState({ username: '', full_name: '', nickname: '', mobile_phone: '', email: '', note: '', role: 'waiter', hourly_rate: '' })
  const avatarInputRef = useRef(null)
  const newAvatarInputRef = useRef(null)

  const { data: waiters = [], isLoading } = useQuery({
    queryKey: ['waiters'],
    queryFn: () => client.get('/api/waiters/').then(r => r.data),
  })
  const { data: groups = [] } = useQuery({
    queryKey: ['table-groups'],
    queryFn: () => client.get('/api/tables/groups').then(r => r.data),
  })

  const invalidate = () => qc.invalidateQueries({ queryKey: ['waiters'] })

  const createWaiter = useMutation({
    mutationFn: async (body) => {
      const res = await client.post('/api/waiters/', body)
      if (newAvatarFile) {
        const fd = new FormData()
        fd.append('file', newAvatarFile)
        await client.post(`/api/waiters/${res.data.id}/avatar`, fd, { headers: { 'Content-Type': 'multipart/form-data' } })
      }
      return res
    },
    onSuccess: () => {
      toast.success('Σερβιτόρος δημιουργήθηκε')
      setAddModal(false); setNewForm(EMPTY_FORM); setNewAvatarFile(null); setNewAvatarPreview(null)
      invalidate()
    },
    onError: (err) => toast.error(err.response?.data?.detail || 'Σφάλμα'),
  })

  const updateWaiter = useMutation({
    mutationFn: ({ id, ...body }) => client.put(`/api/waiters/${id}`, body),
    onSuccess: () => { toast.success('Στοιχεία ενημερώθηκαν'); setEditModal(null); invalidate() },
    onError: (err) => toast.error(err.response?.data?.detail || 'Σφάλμα'),
  })

  const uploadAvatar = useMutation({
    mutationFn: ({ id, file }) => {
      const fd = new FormData(); fd.append('file', file)
      return client.post(`/api/waiters/${id}/avatar`, fd, { headers: { 'Content-Type': 'multipart/form-data' } })
    },
    onSuccess: (res) => { toast.success('Avatar ανέβηκε'); setEditModal(res.data); invalidate() },
    onError: () => toast.error('Σφάλμα μεταφόρτωσης'),
  })

  const deleteAvatar = useMutation({
    mutationFn: (id) => client.delete(`/api/waiters/${id}/avatar`),
    onSuccess: (res) => { toast.success('Avatar αφαιρέθηκε'); setEditModal(res.data); invalidate() },
    onError: () => toast.error('Σφάλμα'),
  })

  const toggleBlock = useMutation({
    mutationFn: (id) => client.put(`/api/waiters/${id}/block`),
    onSuccess: () => invalidate(),
    onError: () => toast.error('Σφάλμα'),
  })

  const resetPin = useMutation({
    mutationFn: ({ id, pin }) => client.put(`/api/waiters/${id}/reset-pin?pin=${encodeURIComponent(pin)}`),
    onSuccess: () => { toast.success('PIN ανανεώθηκε'); setPinModal(null); setNewPin('') },
    onError: () => toast.error('Σφάλμα'),
  })

  const deleteWaiter = useMutation({
    mutationFn: (id) => client.delete(`/api/waiters/${id}`),
    onSuccess: () => { toast.success('Διαγράφηκε'); setConfirmDelete(null); invalidate() },
    onError: () => toast.error('Σφάλμα'),
  })

  if (isLoading) return <div className="flex items-center justify-center h-64 text-gray-400">Φόρτωση…</div>

  function openEdit(w) {
    setEditModal(w)
    setEditForm({ username: w.username || '', full_name: w.full_name || '', nickname: w.nickname || '', mobile_phone: w.mobile_phone || '', email: w.email || '', note: w.note || '', role: w.role || 'waiter', hourly_rate: w.hourly_rate ?? '' })
  }

  return (
    <div className="flex flex-col h-full min-h-0">
      <div className="flex items-center justify-end gap-2 border-b border-slate-200 px-6 flex-shrink-0" style={{ height: 60 }}>
        <Button variant="primary" size="sm" onClick={() => setAddModal(true)}>+ Νέος σερβιτόρος</Button>
      </div>
      <div className="flex-1 overflow-y-auto p-6 space-y-4">

        <div className="card divide-y divide-gray-100">
          {waiters.length === 0 && (
            <p className="px-4 py-8 text-center text-gray-400">Δεν υπάρχουν σερβιτόροι.</p>
          )}
          {waiters.map(w => (
            <div key={w.id} className="flex items-center gap-4 px-4 py-3">
              <WaiterAvatar waiter={w} size={44} />

              <div className="flex-1 min-w-0">
                <div className="flex items-baseline gap-2">
                  <p className="font-semibold text-gray-800">{w.full_name || w.username}</p>
                  {w.nickname && <span className="text-xs text-gray-400">({w.nickname})</span>}
                </div>
                <p className="text-xs text-gray-500">{w.username} · {w.role}</p>
                {w.mobile_phone && <p className="text-xs text-gray-400">{w.mobile_phone}</p>}
                {w.role === 'waiter' && (
                  <p className="text-xs text-gray-400 mt-0.5">
                    {w.zone_assignments.length === 0 ? 'Χωρίς ζώνες'
                      : w.zone_assignments.some(z => z.group_id === null) ? 'Όλες οι ζώνες'
                      : `${w.zone_assignments.length} ζών${w.zone_assignments.length === 1 ? 'η' : 'ες'}`}
                  </p>
                )}
              </div>

              {/* Active status badge — only this stays inline */}
              <span style={{
                fontSize: 11.5, fontWeight: 600, padding: '3px 9px', borderRadius: 999,
                background: w.is_active ? '#dcfce7' : '#fee2e2',
                color: w.is_active ? '#15803d' : '#dc2626',
                flexShrink: 0,
              }}>
                {w.is_active ? 'Ενεργός' : 'Αποκλεισμένος'}
              </span>

              {/* Single actions dropdown */}
              <ActionsMenu
                waiter={w}
                onEdit={() => openEdit(w)}
                onZones={() => setZoneModal(w)}
                onResetPin={() => setPinModal(w.id)}
                onBlock={() => toggleBlock.mutate(w.id)}
                onDelete={() => setConfirmDelete(w.id)}
              />
            </div>
          ))}
        </div>

        {/* Add modal */}
        {addModal && (
          <AddWaiterModal
            form={newForm} setForm={setNewForm}
            avatarFile={newAvatarFile} avatarPreview={newAvatarPreview}
            setAvatarFile={setNewAvatarFile} setAvatarPreview={setNewAvatarPreview}
            avatarInputRef={newAvatarInputRef}
            isPending={createWaiter.isPending}
            onClose={() => { setAddModal(false); setNewForm(EMPTY_FORM); setNewAvatarFile(null); setNewAvatarPreview(null) }}
            onSubmit={() => createWaiter.mutate({
              username: newForm.username, full_name: newForm.full_name || null,
              nickname: newForm.nickname || null, mobile_phone: newForm.mobile_phone || null,
              email: newForm.email || null, note: newForm.note || null,
              pin: newForm.pin, role: newForm.role, is_active: true,
              hourly_rate: newForm.hourly_rate !== '' ? parseFloat(newForm.hourly_rate) : null,
            })}
          />
        )}

        {/* Edit modal */}
        {editModal && (
          <EditWaiterModal
            waiter={editModal} form={editForm} setForm={setEditForm}
            avatarInputRef={avatarInputRef}
            isPending={updateWaiter.isPending}
            isUploadPending={uploadAvatar.isPending}
            isDeletePending={deleteAvatar.isPending}
            onClose={() => setEditModal(null)}
            onSubmit={() => updateWaiter.mutate({
              id: editModal.id,
              username: editForm.username.trim() || undefined,
              full_name: editForm.full_name || null, nickname: editForm.nickname || null,
              mobile_phone: editForm.mobile_phone || null, email: editForm.email || null,
              note: editForm.note || null, role: editForm.role,
              hourly_rate: editForm.hourly_rate !== '' ? parseFloat(editForm.hourly_rate) : null,
            })}
            onUploadAvatar={file => uploadAvatar.mutate({ id: editModal.id, file })}
            onDeleteAvatar={() => deleteAvatar.mutate(editModal.id)}
          />
        )}

        {/* Reset PIN modal */}
        {pinModal !== null && (
          <div className="fixed inset-0 bg-black/40 flex items-center justify-center z-50 p-4">
            <div className="bg-white rounded-2xl shadow-xl w-full max-w-xs p-6 space-y-4">
              <h2 className="font-bold text-gray-800">Επαναφορά PIN — {waiters.find(w => w.id === pinModal)?.username}</h2>
              <PinInput value={newPin} onChange={setNewPin} />
              <div className="flex gap-3 pt-2">
                <button onClick={() => { setPinModal(null); setNewPin('') }} className="flex-1 btn btn-secondary">Ακύρωση</button>
                <button onClick={() => resetPin.mutate({ id: pinModal, pin: newPin })} disabled={newPin.length < 4} className="flex-1 btn btn-primary">
                  Αποθήκευση
                </button>
              </div>
            </div>
          </div>
        )}

        {confirmDelete !== null && (
          <ConfirmModal
            title="Διαγραφή σερβιτόρου;"
            message="Αυτή η ενέργεια δεν μπορεί να αναιρεθεί."
            confirmLabel="Διαγραφή"
            confirmVariant="danger"
            onConfirm={() => deleteWaiter.mutate(confirmDelete)}
            onCancel={() => setConfirmDelete(null)}
          />
        )}

        {zoneModal && (
          <ZoneModal waiter={zoneModal} groups={groups} onClose={() => setZoneModal(null)} />
        )}
      </div>
    </div>
  )
}

// ── Add Waiter Modal — two-column ─────────────────────────────────────────────
function AddWaiterModal({ form, setForm, avatarFile, avatarPreview, setAvatarFile, setAvatarPreview, avatarInputRef, isPending, onClose, onSubmit }) {
  const f = (field, val) => setForm(p => ({ ...p, [field]: val }))
  const canSubmit = form.username.trim() && form.full_name.trim() && form.nickname.trim() && form.pin.length >= 4

  return (
    <div style={{
      position: 'fixed', inset: 0, background: 'rgba(0,0,0,0.45)',
      display: 'flex', alignItems: 'center', justifyContent: 'center',
      zIndex: 50, padding: 24,
    }}>
      <div style={{
        background: '#fff', borderRadius: 20, boxShadow: '0 24px 72px rgba(0,0,0,0.18)',
        width: '100%', maxWidth: 980,
        maxHeight: '90vh', display: 'flex', flexDirection: 'column',
        overflow: 'hidden',
      }}>
        {/* Header */}
        <div style={{ padding: '18px 26px 14px', borderBottom: '1px solid #f3f4f6', display: 'flex', alignItems: 'center', gap: 14, flexShrink: 0 }}>
          {avatarPreview
            ? <img src={avatarPreview} alt="preview" style={{ width: 48, height: 48, borderRadius: '50%', objectFit: 'cover', flexShrink: 0 }} />
            : <div style={{ width: 48, height: 48, borderRadius: '50%', background: '#f3f4f6', display: 'flex', alignItems: 'center', justifyContent: 'center', flexShrink: 0 }}>
                <span style={{ fontSize: 22, color: '#9ca3af' }}>👤</span>
              </div>
          }
          <div style={{ flex: 1, minWidth: 0 }}>
            <h2 style={{ margin: 0, fontWeight: 700, fontSize: 16, color: '#111827' }}>Νέος σερβιτόρος</h2>
            <p style={{ margin: '2px 0 0', fontSize: 12, color: '#9ca3af' }}>Συμπληρώστε τα στοιχεία του εργαζόμενου</p>
          </div>
          <div style={{ display: 'flex', gap: 6 }}>
            <input ref={avatarInputRef} type="file" accept="image/*" style={{ display: 'none' }} onChange={e => {
              const file = e.target.files?.[0]
              if (file) { setAvatarFile(file); setAvatarPreview(URL.createObjectURL(file)) }
              e.target.value = ''
            }} />
            <button onClick={() => avatarInputRef.current?.click()} type="button"
              style={{ fontSize: 12, padding: '5px 11px', border: '1px solid #e5e7eb', background: '#fff', borderRadius: 7, cursor: 'pointer', color: '#374151', fontWeight: 500 }}>
              {avatarPreview ? 'Αλλαγή φωτογραφίας' : 'Προσθήκη φωτογραφίας'}
            </button>
            {avatarPreview && (
              <button type="button" onClick={() => { setAvatarFile(null); setAvatarPreview(null) }}
                style={{ fontSize: 12, padding: '5px 11px', border: '1px solid #fecaca', background: '#fff5f5', borderRadius: 7, cursor: 'pointer', color: '#ef4444', fontWeight: 500 }}>
                Αφαίρεση
              </button>
            )}
          </div>
        </div>

        {/* Body — three columns, scrollable */}
        <div style={{ display: 'grid', gridTemplateColumns: '1fr 1fr 1fr', flex: 1, minHeight: 0, overflowY: 'auto' }}>

          {/* Column 1: Identity + Account */}
          <div style={{ padding: '20px 22px', display: 'flex', flexDirection: 'column', gap: 16, borderRight: '1px solid #f3f4f6' }}>
            <div>
              <SectionLabel>Ταυτότητα</SectionLabel>
              <div style={{ display: 'flex', flexDirection: 'column', gap: 12 }}>
                <FormField label="Πλήρες Όνομα" required desc="Εμφανίζεται στα στατιστικά.">
                  <input style={inputStyle} placeholder="π.χ. Γιώργος Παπαδόπουλος" value={form.full_name} onChange={e => f('full_name', e.target.value)} autoFocus />
                </FormField>
                <FormField label="Παρατσούκλι" required desc="Εμφανίζεται στην εφαρμογή των τηλεφώνων.">
                  <input style={inputStyle} placeholder="π.χ. Γιώργος" value={form.nickname} onChange={e => f('nickname', e.target.value)} />
                </FormField>
              </div>
            </div>

            <div>
              <SectionLabel>Λογαριασμός</SectionLabel>
              <div style={{ display: 'flex', flexDirection: 'column', gap: 12 }}>
                <FormField label="Όνομα χρήστη" required desc="Χρησιμοποιείται για login.">
                  <input style={inputStyle} placeholder="π.χ. giorgos" value={form.username} onChange={e => f('username', e.target.value)} />
                </FormField>
                <FormField label="Ρόλος" required desc="Καθορίζει τα δικαιώματα πρόσβασης.">
                  <select style={inputStyle} value={form.role} onChange={e => f('role', e.target.value)}>
                    <option value="waiter">Σερβιτόρος</option>
                    <option value="manager">Διαχειριστής</option>
                  </select>
                </FormField>
              </div>
            </div>
          </div>

          {/* Column 2: Contact info */}
          <div style={{ padding: '20px 22px', display: 'flex', flexDirection: 'column', gap: 16, borderRight: '1px solid #f3f4f6' }}>
            <div>
              <SectionLabel>Επικοινωνία</SectionLabel>
              <div style={{ display: 'flex', flexDirection: 'column', gap: 12 }}>
                <FormField label="Κινητό τηλέφωνο" desc="Εσωτερική αναφορά μόνο.">
                  <input style={inputStyle} placeholder="π.χ. 6901234567" value={form.mobile_phone} onChange={e => f('mobile_phone', e.target.value)} />
                </FormField>
                <FormField label="Email" desc="Εσωτερική χρήση μόνο.">
                  <input style={inputStyle} type="email" placeholder="π.χ. giorgos@restaurant.gr" value={form.email} onChange={e => f('email', e.target.value)} />
                </FormField>
                <FormField label="Σημείωση" desc="Οποιαδήποτε εσωτερική σημείωση.">
                  <textarea style={{ ...inputStyle, resize: 'none' }} placeholder="π.χ. Μερική απασχόληση" value={form.note} onChange={e => f('note', e.target.value)} rows={4} />
                </FormField>
              </div>
            </div>
          </div>

          {/* Column 3: Payroll + PIN */}
          <div style={{ padding: '20px 22px', display: 'flex', flexDirection: 'column', gap: 16, background: '#fafafa' }}>
            <div>
              <SectionLabel>Μισθοδοσία</SectionLabel>
              <FormField label="Ωριαία αμοιβή (€/ώρα)" desc="Μόνο για διαχειριστές. Δεν εμφανίζεται στον εργαζόμενο.">
                <div style={{ display: 'flex', alignItems: 'center', gap: 8 }}>
                  <input
                    type="number" step="0.50" min="0"
                    style={{ ...inputStyle, width: 110 }}
                    placeholder="π.χ. 5.50"
                    value={form.hourly_rate ?? ''}
                    onChange={e => f('hourly_rate', e.target.value)}
                  />
                  {form.hourly_rate && parseFloat(form.hourly_rate) > 0 && (
                    <span style={{ fontSize: 11.5, color: '#16a34a', fontWeight: 500 }}>
                      €{parseFloat(form.hourly_rate).toFixed(2)}/ώρα
                    </span>
                  )}
                  {!form.hourly_rate && (
                    <span style={{ fontSize: 11, color: '#9ca3af' }}>Δεν παρακολουθείται</span>
                  )}
                </div>
              </FormField>
            </div>
            <SectionLabel>Κωδικός PIN</SectionLabel>
            <p style={{ margin: 0, fontSize: 12, color: '#6b7280', lineHeight: 1.5 }}>
              Ο 4ψήφιος κωδικός που θα χρησιμοποιεί ο εργαζόμενος για να ξεκλειδώσει την εφαρμογή. Μπορεί να αλλάξει οποτεδήποτε.
            </p>
            <div style={{ flex: 1, display: 'flex', alignItems: 'center', justifyContent: 'center', paddingTop: 8 }}>
              <div style={{ width: '100%', maxWidth: 220 }}>
                <PinInput value={form.pin} onChange={pin => f('pin', pin)} />
                {form.pin.length > 0 && form.pin.length < 4 && (
                  <p style={{ textAlign: 'center', fontSize: 11.5, color: '#f59e0b', marginTop: 10 }}>
                    Χρειάζονται {4 - form.pin.length} ψηφία ακόμη
                  </p>
                )}
                {form.pin.length >= 4 && (
                  <p style={{ textAlign: 'center', fontSize: 11.5, color: '#22c55e', marginTop: 10, fontWeight: 600 }}>
                    ✓ PIN ορίστηκε
                  </p>
                )}
              </div>
            </div>
          </div>
        </div>

        {/* Footer */}
        <div style={{ padding: '14px 26px', borderTop: '1px solid #f3f4f6', display: 'flex', justifyContent: 'flex-end', gap: 10, flexShrink: 0 }}>
          <button onClick={onClose} style={{ padding: '8px 18px', border: '1px solid #e5e7eb', background: '#fff', borderRadius: 8, fontSize: 13.5, cursor: 'pointer', color: '#374151', fontWeight: 500 }}>
            Ακύρωση
          </button>
          <button onClick={onSubmit} disabled={isPending || !canSubmit}
            style={{ padding: '8px 20px', border: 'none', background: canSubmit ? '#111827' : '#d1d5db', color: '#fff', borderRadius: 8, fontSize: 13.5, fontWeight: 600, cursor: canSubmit ? 'pointer' : 'not-allowed' }}>
            {isPending ? 'Δημιουργία…' : 'Δημιουργία σερβιτόρου'}
          </button>
        </div>
      </div>
    </div>
  )
}

// ── Edit Waiter Modal — three-column ──────────────────────────────────────────
function EditWaiterModal({ waiter, form, setForm, avatarInputRef, isPending, isUploadPending, isDeletePending, onClose, onSubmit, onUploadAvatar, onDeleteAvatar }) {
  const f = (field, val) => setForm(p => ({ ...p, [field]: val }))
  const canSubmit = form.username.trim() && form.full_name.trim() && form.nickname.trim()

  const zoneLabel = !waiter.zone_assignments?.length ? 'Χωρίς ζώνες'
    : waiter.zone_assignments.some(z => z.group_id === null) ? 'Όλες οι ζώνες'
    : `${waiter.zone_assignments.length} ζών${waiter.zone_assignments.length === 1 ? 'η' : 'ες'}`

  return (
    <div style={{
      position: 'fixed', inset: 0, background: 'rgba(0,0,0,0.45)',
      display: 'flex', alignItems: 'center', justifyContent: 'center',
      zIndex: 50, padding: 24,
    }}>
      <div style={{
        background: '#fff', borderRadius: 20, boxShadow: '0 24px 72px rgba(0,0,0,0.18)',
        width: '100%', maxWidth: 980,
        maxHeight: '90vh', display: 'flex', flexDirection: 'column',
        overflow: 'hidden',
      }}>
        {/* Header */}
        <div style={{ padding: '18px 26px 14px', borderBottom: '1px solid #f3f4f6', display: 'flex', alignItems: 'center', gap: 14, flexShrink: 0 }}>
          <WaiterAvatar waiter={waiter} size={48} />
          <div style={{ flex: 1, minWidth: 0 }}>
            <h2 style={{ margin: 0, fontWeight: 700, fontSize: 16, color: '#111827' }}>
              Επεξεργασία — {waiter.full_name || waiter.username}
            </h2>
            <p style={{ margin: '2px 0 0', fontSize: 12, color: '#9ca3af' }}>Ενημέρωση στοιχείων εργαζόμενου</p>
          </div>
          <div style={{ display: 'flex', gap: 6 }}>
            <input ref={avatarInputRef} type="file" accept="image/*" style={{ display: 'none' }}
              onChange={e => { const file = e.target.files?.[0]; if (file) onUploadAvatar(file); e.target.value = '' }} />
            <button onClick={() => avatarInputRef.current?.click()} disabled={isUploadPending}
              style={{ fontSize: 12, padding: '5px 11px', border: '1px solid #e5e7eb', background: '#fff', borderRadius: 7, cursor: 'pointer', color: '#374151', fontWeight: 500 }}>
              {isUploadPending ? 'Μεταφόρτωση…' : waiter.avatar_url ? 'Αλλαγή φωτογραφίας' : 'Προσθήκη φωτογραφίας'}
            </button>
            {waiter.avatar_url && (
              <button onClick={onDeleteAvatar} disabled={isDeletePending}
                style={{ fontSize: 12, padding: '5px 11px', border: '1px solid #fecaca', background: '#fff5f5', borderRadius: 7, cursor: 'pointer', color: '#ef4444', fontWeight: 500 }}>
                Αφαίρεση
              </button>
            )}
          </div>
        </div>

        {/* Body — three columns, scrollable */}
        <div style={{ display: 'grid', gridTemplateColumns: '1fr 1fr 1fr', flex: 1, minHeight: 0, overflowY: 'auto' }}>

          {/* Column 1: Identity + Account */}
          <div style={{ padding: '20px 22px', display: 'flex', flexDirection: 'column', gap: 16, borderRight: '1px solid #f3f4f6' }}>
            <div>
              <SectionLabel>Ταυτότητα</SectionLabel>
              <div style={{ display: 'flex', flexDirection: 'column', gap: 12 }}>
                <FormField label="Πλήρες Όνομα" required desc="Εμφανίζεται στα στατιστικά.">
                  <input style={inputStyle} value={form.full_name} onChange={e => f('full_name', e.target.value)} autoFocus />
                </FormField>
                <FormField label="Παρατσούκλι" required desc="Εμφανίζεται στην εφαρμογή των τηλεφώνων.">
                  <input style={inputStyle} placeholder="π.χ. Γιώργος" value={form.nickname} onChange={e => f('nickname', e.target.value)} />
                </FormField>
              </div>
            </div>

            <div>
              <SectionLabel>Λογαριασμός</SectionLabel>
              <div style={{ display: 'flex', flexDirection: 'column', gap: 12 }}>
                <FormField label="Όνομα χρήστη" required desc="Χρησιμοποιείται για login.">
                  <input style={inputStyle} value={form.username} onChange={e => f('username', e.target.value)} />
                </FormField>
                <FormField label="Ρόλος" required desc="Καθορίζει τα δικαιώματα πρόσβασης.">
                  <select style={inputStyle} value={form.role} onChange={e => f('role', e.target.value)}>
                    <option value="waiter">Σερβιτόρος</option>
                    <option value="manager">Διαχειριστής</option>
                  </select>
                </FormField>
              </div>
            </div>
          </div>

          {/* Column 2: Contact info */}
          <div style={{ padding: '20px 22px', display: 'flex', flexDirection: 'column', gap: 16, borderRight: '1px solid #f3f4f6' }}>
            <div>
              <SectionLabel>Επικοινωνία</SectionLabel>
              <div style={{ display: 'flex', flexDirection: 'column', gap: 12 }}>
                <FormField label="Κινητό τηλέφωνο" desc="Εσωτερική αναφορά μόνο.">
                  <input style={inputStyle} value={form.mobile_phone} onChange={e => f('mobile_phone', e.target.value)} />
                </FormField>
                <FormField label="Email" desc="Εσωτερική χρήση μόνο.">
                  <input style={inputStyle} type="email" value={form.email} onChange={e => f('email', e.target.value)} />
                </FormField>
                <FormField label="Σημείωση" desc="Οποιαδήποτε εσωτερική σημείωση.">
                  <textarea style={{ ...inputStyle, resize: 'none' }} value={form.note} onChange={e => f('note', e.target.value)} rows={4} />
                </FormField>
              </div>
            </div>
          </div>

          {/* Column 3: Info + Payroll + PIN note */}
          <div style={{ padding: '20px 22px', display: 'flex', flexDirection: 'column', gap: 16, background: '#fafafa' }}>
            <div>
              <SectionLabel>Πληροφορίες</SectionLabel>
              <div style={{ display: 'flex', flexDirection: 'column', gap: 12 }}>
                {/* Row 1: Date + Status side by side */}
                <div style={{ display: 'grid', gridTemplateColumns: '1fr 1fr', gap: 10 }}>
                  <InfoBlock label="Εγγραφή"
                    value={waiter.created_at ? new Date(waiter.created_at).toLocaleDateString('el-GR') : null} />
                  <InfoBlock label="Κατάσταση"
                    value={waiter.is_active ? 'Ενεργός' : 'Αποκλεισμένος'}
                    valueColor={waiter.is_active ? '#16a34a' : '#ef4444'} />
                </div>
                <InfoBlock label="Ρόλος"
                  value={waiter.role === 'waiter' ? 'Σερβιτόρος' : 'Διαχειριστής'} />
                {waiter.role === 'waiter' && (
                  <InfoBlock label="Ζώνες" value={zoneLabel} />
                )}
              </div>
            </div>

            {/* Phase 2B — Payroll */}
            <div>
              <SectionLabel>Μισθοδοσία</SectionLabel>
              <FormField label="Ωριαία αμοιβή (€/ώρα)" desc="Μόνο για διαχειριστές. Δεν εμφανίζεται στον εργαζόμενο.">
                <div style={{ display: 'flex', alignItems: 'center', gap: 8 }}>
                  <input
                    type="number" step="0.50" min="0"
                    style={{ ...inputStyle, width: 110 }}
                    placeholder="π.χ. 5.50"
                    value={form.hourly_rate}
                    onChange={e => f('hourly_rate', e.target.value)}
                  />
                  {form.hourly_rate !== '' && parseFloat(form.hourly_rate) > 0 && (
                    <span style={{ fontSize: 11.5, color: '#16a34a', fontWeight: 500 }}>
                      €{parseFloat(form.hourly_rate).toFixed(2)}/ώρα
                    </span>
                  )}
                  {form.hourly_rate === '' && (
                    <span style={{ fontSize: 11, color: '#9ca3af' }}>Δεν παρακολουθείται</span>
                  )}
                </div>
              </FormField>
            </div>

            <div style={{ marginTop: 4, padding: 14, background: '#f3f4f6', borderRadius: 10 }}>
              <p style={{ margin: '0 0 4px', fontSize: 11.5, fontWeight: 600, color: '#374151' }}>Κωδικός PIN</p>
              <p style={{ margin: 0, fontSize: 11.5, color: '#6b7280', lineHeight: 1.5 }}>
                Για αλλαγή PIN χρησιμοποιήστε την επιλογή <strong style={{ color: '#374151' }}>Επαναφορά PIN</strong> από το μενού Ενεργειών.
              </p>
            </div>
          </div>
        </div>

        {/* Footer */}
        <div style={{ padding: '14px 26px', borderTop: '1px solid #f3f4f6', display: 'flex', justifyContent: 'flex-end', gap: 10, flexShrink: 0 }}>
          <button onClick={onClose} style={{ padding: '8px 18px', border: '1px solid #e5e7eb', background: '#fff', borderRadius: 8, fontSize: 13.5, cursor: 'pointer', color: '#374151', fontWeight: 500 }}>
            Ακύρωση
          </button>
          <button onClick={onSubmit} disabled={isPending || !canSubmit}
            style={{ padding: '8px 20px', border: 'none', background: canSubmit ? '#111827' : '#d1d5db', color: '#fff', borderRadius: 8, fontSize: 13.5, fontWeight: 600, cursor: canSubmit ? 'pointer' : 'not-allowed' }}>
            {isPending ? 'Αποθήκευση…' : 'Αποθήκευση αλλαγών'}
          </button>
        </div>
      </div>
    </div>
  )
}