import React, { useState, useEffect, useRef, useMemo } from 'react'
import { useTripStore } from '../../store/tripStore'
import { useTranslation } from '../../i18n'
import { Plus, Trash2, Calculator, Wallet, ArrowRightLeft } from 'lucide-react'
import CustomSelect from '../shared/CustomSelect'
import { exchangeApi } from '../../api/client'

// ── Helpers ──────────────────────────────────────────────────────────────────
const CURRENCIES = ['EUR', 'USD', 'GBP', 'JPY', 'CHF', 'CZK', 'PLN', 'SEK', 'NOK', 'DKK', 'TRY', 'THB', 'AUD', 'CAD']
const SYMBOLS = { EUR: '€', USD: '$', GBP: '£', JPY: '¥', CHF: 'CHF', CZK: 'Kč', PLN: 'zł', SEK: 'kr', NOK: 'kr', DKK: 'kr', TRY: '₺', THB: '฿', AUD: 'A$', CAD: 'C$' }
const PIE_COLORS = ['#6366f1', '#ec4899', '#f59e0b', '#10b981', '#3b82f6', '#8b5cf6', '#ef4444', '#14b8a6', '#f97316', '#06b6d4', '#84cc16', '#a855f7']

const fmtNum = (v, locale, cur) => {
  if (v == null || isNaN(v)) return '-'
  return Number(v).toLocaleString(locale, { minimumFractionDigits: 2, maximumFractionDigits: 2 }) + ' ' + (SYMBOLS[cur] || cur)
}

const calcPP = (p, n) => (n > 0 ? p / n : null)
const calcPD = (p, d) => (d > 0 ? p / d : null)
const calcPPD = (p, n, d) => (n > 0 && d > 0 ? p / (n * d) : null)

// ── Inline Edit Cell ─────────────────────────────────────────────────────────
function InlineEditCell({ value, onSave, type = 'text', style = {}, placeholder = '', decimals = 2, locale, editTooltip }) {
  const [editing, setEditing] = useState(false)
  const [editValue, setEditValue] = useState(value ?? '')
  const inputRef = useRef(null)

  useEffect(() => { if (editing && inputRef.current) { inputRef.current.focus(); inputRef.current.select() } }, [editing])

  const save = () => {
    setEditing(false)
    let v = editValue
    if (type === 'number') { const p = parseFloat(String(editValue).replace(',', '.')); v = isNaN(p) ? null : p }
    if (v !== value) onSave(v)
  }

  if (editing) {
    return <input ref={inputRef} type="text" inputMode={type === 'number' ? 'decimal' : 'text'} value={editValue}
      onChange={e => setEditValue(e.target.value)} onBlur={save}
      onKeyDown={e => { if (e.key === 'Enter') save(); if (e.key === 'Escape') { setEditValue(value ?? ''); setEditing(false) } }}
      style={{ width: '100%', border: '1px solid var(--accent)', borderRadius: 4, padding: '4px 6px', fontSize: 13, outline: 'none', background: 'var(--bg-input)', color: 'var(--text-primary)', fontFamily: 'inherit', ...style }}
      placeholder={placeholder} />
  }

  const display = type === 'number' && value != null
    ? Number(value).toLocaleString(locale, { minimumFractionDigits: decimals, maximumFractionDigits: decimals })
    : (value || '')

  return (
    <div onClick={() => { setEditValue(value ?? ''); setEditing(true) }} title={editTooltip}
      style={{ cursor: 'pointer', padding: '4px 6px', borderRadius: 4, minHeight: 28, display: 'flex', alignItems: 'center',
        justifyContent: style?.textAlign === 'center' ? 'center' : 'flex-start', transition: 'background 0.15s',
        color: display ? 'var(--text-primary)' : 'var(--text-faint)', fontSize: 13, ...style }}
      onMouseEnter={e => e.currentTarget.style.background = 'var(--bg-hover)'}
      onMouseLeave={e => e.currentTarget.style.background = 'transparent'}>
      {display || placeholder || '-'}
    </div>
  )
}

// ── Add Item Row ─────────────────────────────────────────────────────────────
function AddItemRow({ onAdd, t }) {
  const [name, setName] = useState('')
  const [price, setPrice] = useState('')
  const [persons, setPersons] = useState('')
  const [days, setDays] = useState('')
  const [note, setNote] = useState('')
  const nameRef = useRef(null)

  const handleAdd = () => {
    if (!name.trim()) return
    onAdd({ name: name.trim(), total_price: parseFloat(String(price).replace(',', '.')) || 0, persons: parseInt(persons) || null, days: parseInt(days) || null, note: note.trim() || null })
    setName(''); setPrice(''); setPersons(''); setDays(''); setNote('')
    setTimeout(() => nameRef.current?.focus(), 50)
  }

  const inp = { border: '1px solid var(--border-primary)', borderRadius: 4, padding: '4px 6px', fontSize: 13, outline: 'none', fontFamily: 'inherit', width: '100%', background: 'var(--bg-input)', color: 'var(--text-primary)' }

  return (
    <tr style={{ background: 'var(--bg-secondary)' }}>
      <td style={{ padding: '4px 6px' }}>
        <input ref={nameRef} value={name} onChange={e => setName(e.target.value)} onKeyDown={e => e.key === 'Enter' && handleAdd()}
          placeholder={t('budget.newEntry')} style={inp} />
      </td>
      <td style={{ padding: '4px 6px' }}>
        <input value={price} onChange={e => setPrice(e.target.value)} onKeyDown={e => e.key === 'Enter' && handleAdd()}
          placeholder="0,00" inputMode="decimal" style={{ ...inp, textAlign: 'center' }} />
      </td>
      <td className="hidden sm:table-cell" style={{ padding: '4px 6px', textAlign: 'center' }}>
        <input value={persons} onChange={e => setPersons(e.target.value)} onKeyDown={e => e.key === 'Enter' && handleAdd()}
          placeholder="-" inputMode="numeric" style={{ ...inp, textAlign: 'center', maxWidth: 50, margin: '0 auto' }} />
      </td>
      <td className="hidden sm:table-cell" style={{ padding: '4px 6px', textAlign: 'center' }}>
        <input value={days} onChange={e => setDays(e.target.value)} onKeyDown={e => e.key === 'Enter' && handleAdd()}
          placeholder="-" inputMode="numeric" style={{ ...inp, textAlign: 'center', maxWidth: 50, margin: '0 auto' }} />
      </td>
      <td className="hidden md:table-cell" style={{ padding: '4px 6px', color: 'var(--text-faint)', fontSize: 12, textAlign: 'center' }}>-</td>
      <td className="hidden md:table-cell" style={{ padding: '4px 6px', color: 'var(--text-faint)', fontSize: 12, textAlign: 'center' }}>-</td>
      <td className="hidden lg:table-cell" style={{ padding: '4px 6px', color: 'var(--text-faint)', fontSize: 12, textAlign: 'center' }}>-</td>
      <td className="hidden sm:table-cell" style={{ padding: '4px 6px' }}>
        <input value={note} onChange={e => setNote(e.target.value)} onKeyDown={e => e.key === 'Enter' && handleAdd()} placeholder={t('budget.table.note')} style={inp} />
      </td>
      <td style={{ padding: '4px 6px', textAlign: 'center' }}>
        <button onClick={handleAdd} disabled={!name.trim()} title={t('reservations.add')}
          style={{ background: name.trim() ? 'var(--text-primary)' : 'var(--border-primary)', border: 'none', borderRadius: 4, color: 'var(--bg-primary)',
            cursor: name.trim() ? 'pointer' : 'default', padding: '4px 8px', display: 'inline-flex', alignItems: 'center' }}>
          <Plus size={14} />
        </button>
      </td>
    </tr>
  )
}

// ── Pie Chart (pure CSS conic-gradient) ──────────────────────────────────────
function PieChart({ segments, size = 200, totalLabel }) {
  if (!segments.length) return null

  const total = segments.reduce((s, x) => s + x.value, 0)
  if (total === 0) return null

  let cumDeg = 0
  const stops = segments.map(seg => {
    const start = cumDeg
    const deg = (seg.value / total) * 360
    cumDeg += deg
    return `${seg.color} ${start}deg ${start + deg}deg`
  }).join(', ')

  return (
    <div style={{ position: 'relative', width: size, height: size, margin: '0 auto' }}>
      <div style={{
        width: size, height: size, borderRadius: '50%',
        background: `conic-gradient(${stops})`,
        boxShadow: '0 4px 24px rgba(0,0,0,0.08)',
      }} />
      <div style={{
        position: 'absolute', top: '50%', left: '50%',
        transform: 'translate(-50%, -50%)',
        width: size * 0.55, height: size * 0.55,
        borderRadius: '50%', background: 'var(--bg-card)',
        display: 'flex', flexDirection: 'column', alignItems: 'center', justifyContent: 'center',
        boxShadow: 'inset 0 0 12px rgba(0,0,0,0.04)',
      }}>
        <Wallet size={18} color="var(--text-faint)" style={{ marginBottom: 2 }} />
        <span style={{ fontSize: 10, color: 'var(--text-faint)', fontWeight: 500 }}>{totalLabel}</span>
      </div>
    </div>
  )
}

// ── Main Component ───────────────────────────────────────────────────────────
export default function BudgetPanel({ tripId }) {
  const { trip, budgetItems, addBudgetItem, updateBudgetItem, deleteBudgetItem, loadBudgetItems, updateTrip } = useTripStore()
  const { t, locale } = useTranslation()
  const [newCategoryName, setNewCategoryName] = useState('')
  const currency = trip?.currency || 'EUR'
  const [rates, setRates] = useState(null)
  const [convertTo, setConvertTo] = useState(() => {
    const saved = localStorage.getItem('budget_convert_to')
    return saved || (currency === 'EUR' ? 'USD' : 'EUR')
  })

  useEffect(() => {
    exchangeApi.getRates().then(setRates).catch(() => {})
  }, [])

  const fmt = (v, cur) => fmtNum(v, locale, cur)

  const setCurrency = (cur) => {
    if (tripId) updateTrip(tripId, { currency: cur })
  }

  useEffect(() => { if (tripId) loadBudgetItems(tripId) }, [tripId])

  const grouped = useMemo(() => (budgetItems || []).reduce((acc, item) => {
    const cat = item.category || 'Sonstiges'
    if (!acc[cat]) acc[cat] = []
    acc[cat].push(item)
    return acc
  }, {}), [budgetItems])

  const categoryNames = Object.keys(grouped)
  const grandTotal = (budgetItems || []).reduce((s, i) => s + (i.total_price || 0), 0)

  const pieSegments = useMemo(() =>
    categoryNames.map((cat, i) => ({
      name: cat,
      value: grouped[cat].reduce((s, x) => s + (x.total_price || 0), 0),
      color: PIE_COLORS[i % PIE_COLORS.length],
    })).filter(s => s.value > 0)
  , [grouped, categoryNames])

  const handleAddItem = async (category, data) => { try { await addBudgetItem(tripId, { ...data, category }) } catch {} }
  const handleUpdateField = async (id, field, value) => { try { await updateBudgetItem(tripId, id, { [field]: value }) } catch {} }
  const handleDeleteItem = async (id) => { try { await deleteBudgetItem(tripId, id) } catch {} }
  const handleDeleteCategory = async (cat) => {
    const items = grouped[cat] || []
    for (const item of items) await deleteBudgetItem(tripId, item.id)
  }
  const handleAddCategory = () => {
    if (!newCategoryName.trim()) return
    addBudgetItem(tripId, { name: t('budget.defaultEntry'), category: newCategoryName.trim(), total_price: 0 })
    setNewCategoryName('')
  }

  const th = { padding: '6px 8px', textAlign: 'center', fontSize: 11, fontWeight: 600, color: 'var(--text-muted)', textTransform: 'uppercase', letterSpacing: '0.05em', borderBottom: '2px solid var(--border-primary)', whiteSpace: 'nowrap', background: 'var(--bg-secondary)' }
  const td = { padding: '2px 6px', borderBottom: '1px solid var(--border-secondary)', fontSize: 13, verticalAlign: 'middle', color: 'var(--text-primary)' }

  // ── Empty State ──────────────────────────────────────────────────────────
  if (!budgetItems || budgetItems.length === 0) {
    return (
      <div style={{ padding: 24, maxWidth: 600, margin: '60px auto', textAlign: 'center' }}>
        <div style={{ width: 64, height: 64, borderRadius: 16, background: 'var(--bg-tertiary)', display: 'flex', alignItems: 'center', justifyContent: 'center', margin: '0 auto 20px' }}>
          <Calculator size={28} color="#6b7280" />
        </div>
        <h2 style={{ fontSize: 20, fontWeight: 700, color: 'var(--text-primary)', margin: '0 0 8px' }}>{t('budget.emptyTitle')}</h2>
        <p style={{ fontSize: 14, color: 'var(--text-muted)', margin: '0 0 24px', lineHeight: 1.5 }}>{t('budget.emptyText')}</p>
        <div style={{ display: 'flex', gap: 6, justifyContent: 'center', alignItems: 'stretch', maxWidth: 320, margin: '0 auto' }}>
          <input value={newCategoryName} onChange={e => setNewCategoryName(e.target.value)}
            onKeyDown={e => e.key === 'Enter' && handleAddCategory()}
            placeholder={t('budget.emptyPlaceholder')}
            style={{ flex: 1, padding: '9px 14px', borderRadius: 10, border: '1px solid var(--border-primary)', fontSize: 13, fontFamily: 'inherit', outline: 'none', background: 'var(--bg-input)', color: 'var(--text-primary)', minWidth: 0 }} />
          <button onClick={handleAddCategory} disabled={!newCategoryName.trim()}
            style={{ background: 'var(--accent)', color: 'var(--accent-text)', border: 'none', borderRadius: 10, padding: '0 12px', cursor: 'pointer', display: 'flex', alignItems: 'center', opacity: newCategoryName.trim() ? 1 : 0.5, flexShrink: 0 }}>
            <Plus size={16} />
          </button>
        </div>
      </div>
    )
  }

  // ── Main Layout ──────────────────────────────────────────────────────────
  return (
    <div style={{ fontFamily: "'Poppins', -apple-system, BlinkMacSystemFont, system-ui, sans-serif" }}>
      <div style={{ display: 'flex', alignItems: 'center', justifyContent: 'space-between', padding: '16px 16px 12px', flexWrap: 'wrap', gap: 8 }}>
        <div style={{ display: 'flex', alignItems: 'center', gap: 10 }}>
          <Calculator size={20} color="var(--text-primary)" />
          <h2 style={{ fontSize: 18, fontWeight: 700, color: 'var(--text-primary)', margin: 0 }}>{t('budget.title')}</h2>
        </div>
      </div>

      <div style={{ display: 'flex', gap: 20, padding: '0 16px 40px', alignItems: 'flex-start', flexWrap: 'wrap' }}>
        <div style={{ flex: 1, minWidth: 0 }}>
          {categoryNames.map((cat, ci) => {
            const items = grouped[cat]
            const subtotal = items.reduce((s, x) => s + (x.total_price || 0), 0)
            const color = PIE_COLORS[ci % PIE_COLORS.length]

            return (
              <div key={cat} style={{ marginBottom: 16 }}>
                <div style={{ display: 'flex', alignItems: 'center', justifyContent: 'space-between', background: '#000000', color: '#fff', borderRadius: '10px 10px 0 0', padding: '9px 14px' }}>
                  <div style={{ display: 'flex', alignItems: 'center', gap: 8 }}>
                    <div style={{ width: 10, height: 10, borderRadius: 3, background: color, flexShrink: 0 }} />
                    <span style={{ fontWeight: 600, fontSize: 13 }}>{cat}</span>
                  </div>
                  <div style={{ display: 'flex', alignItems: 'center', gap: 10 }}>
                    <span style={{ fontSize: 13, fontWeight: 500, opacity: 0.9 }}>{fmt(subtotal, currency)}</span>
                    <button onClick={() => handleDeleteCategory(cat)} title={t('budget.deleteCategory')}
                      style={{ background: 'rgba(255,255,255,0.1)', border: 'none', borderRadius: 4, color: '#fff', cursor: 'pointer', padding: '3px 6px', display: 'flex', alignItems: 'center', opacity: 0.6 }}
                      onMouseEnter={e => e.currentTarget.style.opacity = '1'} onMouseLeave={e => e.currentTarget.style.opacity = '0.6'}>
                      <Trash2 size={13} />
                    </button>
                  </div>
                </div>

                <div style={{ overflowX: 'auto', border: '1px solid var(--border-primary)', borderTop: 'none', borderRadius: '0 0 10px 10px' }}>
                  <table style={{ width: '100%', borderCollapse: 'collapse' }}>
                    <thead>
                      <tr>
                        <th style={{ ...th, textAlign: 'left', minWidth: 100 }}>{t('budget.table.name')}</th>
                        <th style={{ ...th, minWidth: 80 }}>{t('budget.table.total')}</th>
                        <th className="hidden sm:table-cell" style={{ ...th, minWidth: 50 }}>{t('budget.table.persons')}</th>
                        <th className="hidden sm:table-cell" style={{ ...th, minWidth: 45 }}>{t('budget.table.days')}</th>
                        <th className="hidden md:table-cell" style={{ ...th, minWidth: 90 }}>{t('budget.table.perPerson')}</th>
                        <th className="hidden md:table-cell" style={{ ...th, minWidth: 80 }}>{t('budget.table.perDay')}</th>
                        <th className="hidden lg:table-cell" style={{ ...th, minWidth: 95 }}>{t('budget.table.perPersonDay')}</th>
                        <th className="hidden sm:table-cell" style={{ ...th, textAlign: 'left', minWidth: 80 }}>{t('budget.table.note')}</th>
                        <th style={{ ...th, width: 36 }}></th>
                      </tr>
                    </thead>
                    <tbody>
                      {items.map(item => {
                        const pp = calcPP(item.total_price, item.persons)
                        const pd = calcPD(item.total_price, item.days)
                        const ppd = calcPPD(item.total_price, item.persons, item.days)
                        return (
                          <tr key={item.id} style={{ transition: 'background 0.1s' }}
                            onMouseEnter={e => e.currentTarget.style.background = 'var(--bg-hover)'}
                            onMouseLeave={e => e.currentTarget.style.background = 'transparent'}>
                            <td style={td}><InlineEditCell value={item.name} onSave={v => handleUpdateField(item.id, 'name', v)} placeholder={t('budget.table.name')} locale={locale} editTooltip={t('budget.editTooltip')} /></td>
                            <td style={{ ...td, textAlign: 'center' }}>
                              <InlineEditCell value={item.total_price} type="number" onSave={v => handleUpdateField(item.id, 'total_price', v)} style={{ textAlign: 'center' }} placeholder="0,00" locale={locale} editTooltip={t('budget.editTooltip')} />
                            </td>
                            <td className="hidden sm:table-cell" style={{ ...td, textAlign: 'center' }}>
                              <InlineEditCell value={item.persons} type="number" decimals={0} onSave={v => handleUpdateField(item.id, 'persons', v != null ? parseInt(v) || null : null)} style={{ textAlign: 'center' }} placeholder="-" locale={locale} editTooltip={t('budget.editTooltip')} />
                            </td>
                            <td className="hidden sm:table-cell" style={{ ...td, textAlign: 'center' }}>
                              <InlineEditCell value={item.days} type="number" decimals={0} onSave={v => handleUpdateField(item.id, 'days', v != null ? parseInt(v) || null : null)} style={{ textAlign: 'center' }} placeholder="-" locale={locale} editTooltip={t('budget.editTooltip')} />
                            </td>
                            <td className="hidden md:table-cell" style={{ ...td, textAlign: 'center', color: pp != null ? 'var(--text-secondary)' : 'var(--text-faint)' }}>{pp != null ? fmt(pp, currency) : '-'}</td>
                            <td className="hidden md:table-cell" style={{ ...td, textAlign: 'center', color: pd != null ? 'var(--text-secondary)' : 'var(--text-faint)' }}>{pd != null ? fmt(pd, currency) : '-'}</td>
                            <td className="hidden lg:table-cell" style={{ ...td, textAlign: 'center', color: ppd != null ? 'var(--text-secondary)' : 'var(--text-faint)' }}>{ppd != null ? fmt(ppd, currency) : '-'}</td>
                            <td className="hidden sm:table-cell" style={td}><InlineEditCell value={item.note} onSave={v => handleUpdateField(item.id, 'note', v)} placeholder={t('budget.table.note')} locale={locale} editTooltip={t('budget.editTooltip')} /></td>
                            <td style={{ ...td, textAlign: 'center' }}>
                              <button onClick={() => handleDeleteItem(item.id)} title={t('common.delete')}
                                style={{ background: 'none', border: 'none', cursor: 'pointer', padding: 4, color: 'var(--text-faint)', borderRadius: 4, display: 'inline-flex', transition: 'color 0.15s' }}
                                onMouseEnter={e => e.currentTarget.style.color = '#ef4444'} onMouseLeave={e => e.currentTarget.style.color = '#d1d5db'}>
                                <Trash2 size={14} />
                              </button>
                            </td>
                          </tr>
                        )
                      })}
                      <AddItemRow onAdd={data => handleAddItem(cat, data)} t={t} />
                    </tbody>
                  </table>
                </div>
              </div>
            )
          })}
        </div>

        <div className="w-full md:w-[280px]" style={{ flexShrink: 0, position: 'sticky', top: 16, alignSelf: 'flex-start' }}>
          <div style={{ marginBottom: 12 }}>
            <CustomSelect
              value={currency}
              onChange={setCurrency}
              options={CURRENCIES.map(c => ({ value: c, label: `${c} (${SYMBOLS[c] || c})` }))}
              searchable
            />
          </div>

          <div style={{ display: 'flex', gap: 6, marginBottom: 12 }}>
            <input
              value={newCategoryName}
              onChange={e => setNewCategoryName(e.target.value)}
              onKeyDown={e => { if (e.key === 'Enter') handleAddCategory() }}
              placeholder={t('budget.categoryName')}
              style={{ flex: 1, border: '1px solid var(--border-primary)', borderRadius: 10, padding: '9px 14px', fontSize: 13, outline: 'none', fontFamily: 'inherit', background: 'var(--bg-input)', color: 'var(--text-primary)' }}
            />
            <button onClick={handleAddCategory} disabled={!newCategoryName.trim()}
              style={{ background: 'var(--accent)', color: 'var(--accent-text)', border: 'none', borderRadius: 10, padding: '9px 12px', cursor: 'pointer', display: 'flex', alignItems: 'center', opacity: newCategoryName.trim() ? 1 : 0.4, flexShrink: 0 }}>
              <Plus size={16} />
            </button>
          </div>

          <div style={{
            background: 'linear-gradient(135deg, #000000 0%, #18181b 100%)',
            borderRadius: 16, padding: '24px 20px', color: '#fff', marginBottom: 16,
            boxShadow: '0 8px 32px rgba(15,23,42,0.18)',
          }}>
            <div style={{ display: 'flex', alignItems: 'center', gap: 8, marginBottom: 16 }}>
              <div style={{ width: 36, height: 36, borderRadius: 10, background: 'rgba(255,255,255,0.1)', display: 'flex', alignItems: 'center', justifyContent: 'center' }}>
                <Wallet size={18} color="rgba(255,255,255,0.8)" />
              </div>
              <div>
                <div style={{ fontSize: 11, color: 'rgba(255,255,255,0.5)', fontWeight: 500, letterSpacing: 0.5 }}>{t('budget.totalBudget')}</div>
              </div>
            </div>
            <div style={{ fontSize: 28, fontWeight: 700, lineHeight: 1, marginBottom: 4 }}>
              {Number(grandTotal).toLocaleString(locale, { minimumFractionDigits: 2, maximumFractionDigits: 2 })}
            </div>
            <div style={{ fontSize: 14, color: 'rgba(255,255,255,0.5)', fontWeight: 500 }}>{SYMBOLS[currency] || currency} {currency}</div>

            {/* Live exchange rate conversion */}
            {rates && (() => {
              const fromRate = currency === 'EUR' ? 1 : rates.rates?.[currency]
              const toRate = convertTo === 'EUR' ? 1 : rates.rates?.[convertTo]
              const converted = fromRate && toRate ? (grandTotal / fromRate) * toRate : null
              return converted != null ? (
                <div style={{ marginTop: 16, paddingTop: 14, borderTop: '1px solid rgba(255,255,255,0.1)' }}>
                  <div style={{ display: 'flex', alignItems: 'center', gap: 6, marginBottom: 8 }}>
                    <ArrowRightLeft size={12} style={{ color: 'rgba(255,255,255,0.4)' }} />
                    <span style={{ fontSize: 10, color: 'rgba(255,255,255,0.4)', fontWeight: 500, textTransform: 'uppercase', letterSpacing: 0.5 }}>{t('budget.converted')}</span>
                  </div>
                  <div style={{ display: 'flex', alignItems: 'baseline', gap: 8 }}>
                    <span style={{ fontSize: 20, fontWeight: 700 }}>
                      {Number(converted).toLocaleString(locale, { minimumFractionDigits: 2, maximumFractionDigits: 2 })}
                    </span>
                    <select
                      value={convertTo}
                      onChange={e => { setConvertTo(e.target.value); localStorage.setItem('budget_convert_to', e.target.value) }}
                      style={{ background: 'rgba(255,255,255,0.1)', border: 'none', borderRadius: 6, color: 'rgba(255,255,255,0.7)', fontSize: 12, fontWeight: 600, padding: '2px 4px', cursor: 'pointer', fontFamily: 'inherit' }}
                    >
                      {CURRENCIES.filter(c => c !== currency).map(c => (
                        <option key={c} value={c}>{c}</option>
                      ))}
                    </select>
                  </div>
                  <div style={{ fontSize: 10, color: 'rgba(255,255,255,0.3)', marginTop: 4 }}>
                    1 {currency} = {((toRate / fromRate) || 0).toFixed(4)} {convertTo}
                  </div>
                </div>
              ) : null
            })()}
          </div>

          {pieSegments.length > 0 && (
            <div style={{
              background: 'var(--bg-card)', borderRadius: 16, padding: '20px 16px',
              border: '1px solid var(--border-primary)',
              boxShadow: '0 2px 12px rgba(0,0,0,0.04)',
            }}>
              <div style={{ fontSize: 13, fontWeight: 600, color: 'var(--text-primary)', marginBottom: 16, textAlign: 'center' }}>{t('budget.byCategory')}</div>

              <PieChart segments={pieSegments} size={180} totalLabel={t('budget.total')} />

              <div style={{ marginTop: 20, display: 'flex', flexDirection: 'column', gap: 8 }}>
                {pieSegments.map(seg => {
                  const pct = grandTotal > 0 ? ((seg.value / grandTotal) * 100).toFixed(1) : '0.0'
                  return (
                    <div key={seg.name} style={{ display: 'flex', alignItems: 'center', gap: 8 }}>
                      <div style={{ width: 10, height: 10, borderRadius: 3, background: seg.color, flexShrink: 0 }} />
                      <span style={{ flex: 1, fontSize: 12, color: 'var(--text-secondary)', fontWeight: 500 }}>{seg.name}</span>
                      <span style={{ fontSize: 12, color: 'var(--text-muted)', fontWeight: 600, whiteSpace: 'nowrap' }}>{pct}%</span>
                    </div>
                  )
                })}
              </div>

              <div style={{ marginTop: 12, borderTop: '1px solid var(--border-secondary)', paddingTop: 12, display: 'flex', flexDirection: 'column', gap: 6 }}>
                {pieSegments.map(seg => (
                  <div key={seg.name} style={{ display: 'flex', justifyContent: 'space-between', alignItems: 'center' }}>
                    <span style={{ fontSize: 11, color: 'var(--text-faint)' }}>{seg.name}</span>
                    <span style={{ fontSize: 12, color: 'var(--text-secondary)', fontWeight: 600 }}>{fmt(seg.value, currency)}</span>
                  </div>
                ))}
              </div>
            </div>
          )}
        </div>
      </div>
    </div>
  )
}