feat: add VAT breakdown to PlanSummary

components/checkout/PlanSummary.tsx

@@ -1,28 +1,36 @@
 'use client'
 
-import { useState } from 'react'
+import { useState, useEffect, useCallback } from 'react'
 import { useRouter, useSearchParams } from 'next/navigation'
 import { motion } from 'framer-motion'
-import {
-  TRAFFIC_TIERS,
-  PLAN_PRICES,
-} from '@/lib/plans'
+import { Select } from '@ciphera-net/ui'
+import { TRAFFIC_TIERS, PLAN_PRICES } from '@/lib/plans'
+import { COUNTRY_OPTIONS } from '@/lib/countries'
+import { calculateVAT, type VATResult } from '@/lib/api/billing'
 
 interface PlanSummaryProps {
   plan: string
   interval: string
   limit: number
+  country: string
+  vatId: string
+  onCountryChange: (country: string) => void
+  onVatIdChange: (vatId: string) => void
 }
 
-export default function PlanSummary({ plan, interval, limit }: PlanSummaryProps) {
+const inputClass =
+  'w-full rounded-lg border border-neutral-700 bg-neutral-800/50 px-3 py-2.5 text-sm text-white placeholder:text-neutral-500 focus:outline-none focus:ring-1 focus:ring-brand-orange focus:border-brand-orange transition-colors'
+
+export default function PlanSummary({ plan, interval, limit, country, vatId, onCountryChange, onVatIdChange }: PlanSummaryProps) {
   const router = useRouter()
   const searchParams = useSearchParams()
   const [currentInterval, setCurrentInterval] = useState(interval)
+  const [vatResult, setVatResult] = useState<VATResult | null>(null)
+  const [vatLoading, setVatLoading] = useState(false)
 
   const monthlyCents = PLAN_PRICES[plan]?.[limit] || 0
   const isYearly = currentInterval === 'year'
-  const displayPrice = isYearly ? (monthlyCents * 11) / 100 : monthlyCents / 100
-  const monthlyEquivalent = isYearly ? displayPrice / 12 : displayPrice
+  const baseDisplay = isYearly ? (monthlyCents * 11) / 100 : monthlyCents / 100
 
   const tierLabel =
     TRAFFIC_TIERS.find((t) => t.value === limit)?.label ||
@@ -35,18 +43,35 @@ export default function PlanSummary({ plan, interval, limit }: PlanSummaryProps)
     router.replace(`/checkout?${params.toString()}`, { scroll: false })
   }
 
+  const fetchVAT = useCallback(async (c: string, v: string, iv: string) => {
+    if (!c) { setVatResult(null); return }
+    setVatLoading(true)
+    try {
+      const result = await calculateVAT({ plan_id: plan, interval: iv, limit, country: c, vat_id: v || undefined })
+      setVatResult(result)
+    } catch {
+      setVatResult(null)
+    } finally {
+      setVatLoading(false)
+    }
+  }, [plan, limit])
+
+  useEffect(() => {
+    if (!country) { setVatResult(null); return }
+    const timer = setTimeout(() => fetchVAT(country, vatId, currentInterval), vatId ? 400 : 0)
+    return () => clearTimeout(timer)
+  }, [country, vatId, currentInterval, fetchVAT])
+
   return (
-    <div className="rounded-2xl border border-neutral-800 bg-neutral-900/50 backdrop-blur-xl p-5">
+    <div className="rounded-2xl border border-neutral-800 bg-neutral-900/50 backdrop-blur-xl p-5 space-y-4">
+      {/* Plan name + interval toggle */}
       <div className="flex flex-col sm:flex-row sm:items-center gap-4">
-        {/* Plan name + badge */}
         <div className="flex items-center gap-3">
           <h2 className="text-lg font-semibold text-white capitalize">{plan}</h2>
           <span className="rounded-full bg-brand-orange/15 px-3 py-0.5 text-xs font-medium text-brand-orange">
             30-day trial
           </span>
         </div>
-
-        {/* Interval toggle */}
         <div className="flex items-center gap-1 p-1 bg-neutral-800/50 rounded-xl sm:ml-auto">
           {(['month', 'year'] as const).map((iv) => (
             <button
@@ -70,24 +95,78 @@ export default function PlanSummary({ plan, interval, limit }: PlanSummaryProps)
         </div>
       </div>
 
-      {/* Price row */}
-      <div className="mt-4 flex items-baseline gap-2 flex-wrap">
-        <span className="text-3xl font-bold tracking-tight text-white">
-          &euro;{isYearly ? monthlyEquivalent.toFixed(2) : displayPrice.toFixed(0)}
-        </span>
-        <span className="text-neutral-400 text-sm">/mo</span>
-        <span className="text-neutral-500 text-sm">&middot; {tierLabel} pageviews</span>
-        {isYearly && (
-          <span className="rounded-full bg-brand-orange/15 px-2.5 py-0.5 text-xs font-medium text-brand-orange">
-            Save 1 month
-          </span>
-        )}
+      {/* Country */}
+      <div>
+        <label className="block text-sm font-medium text-neutral-300 mb-1.5">Country</label>
+        <Select
+          value={country}
+          onChange={onCountryChange}
+          variant="input"
+          options={[{ value: '', label: 'Select country' }, ...COUNTRY_OPTIONS.map((c) => ({ value: c.value, label: c.label }))]}
+        />
+      </div>
+
+      {/* VAT ID */}
+      <div>
+        <label className="block text-sm font-medium text-neutral-300 mb-1.5">
+          VAT ID <span className="text-neutral-500">(optional)</span>
+        </label>
+        <input
+          type="text"
+          value={vatId}
+          onChange={(e) => onVatIdChange(e.target.value)}
+          placeholder="e.g. BE0123456789"
+          className={inputClass}
+        />
+      </div>
+
+      {/* Price breakdown */}
+      <div className="pt-2 border-t border-neutral-800">
+        {!country ? (
+          <div className="flex items-baseline gap-2 flex-wrap">
+            <span className="text-3xl font-bold tracking-tight text-white">
+              &euro;{isYearly ? (baseDisplay / 12).toFixed(2) : baseDisplay.toFixed(0)}
+            </span>
+            <span className="text-neutral-400 text-sm">/mo</span>
+            <span className="text-neutral-500 text-sm">excl. VAT &middot; {tierLabel} pageviews</span>
+            {isYearly && (
+              <span className="rounded-full bg-brand-orange/15 px-2.5 py-0.5 text-xs font-medium text-brand-orange">
+                Save 1 month
+              </span>
+            )}
+          </div>
+        ) : vatLoading ? (
+          <div className="flex items-center gap-2 text-sm text-neutral-400">
+            <div className="h-4 w-4 animate-spin rounded-full border-2 border-neutral-600 border-t-white" />
+            Calculating VAT...
+          </div>
+        ) : vatResult ? (
+          <div className="space-y-1.5 text-sm">
+            <div className="flex justify-between text-neutral-400">
+              <span>Subtotal ({tierLabel} pageviews)</span>
+              <span>&euro;{vatResult.base_amount}</span>
+            </div>
+            {vatResult.vat_exempt ? (
+              <div className="flex justify-between text-neutral-500 text-xs">
+                <span>{vatResult.vat_reason}</span>
+                <span>&euro;0.00</span>
+              </div>
+            ) : (
+              <div className="flex justify-between text-neutral-400">
+                <span>VAT {vatResult.vat_rate}%</span>
+                <span>&euro;{vatResult.vat_amount}</span>
+              </div>
+            )}
+            <div className="flex justify-between font-semibold text-white pt-1 border-t border-neutral-800">
+              <span>Total /mo</span>
+              <span>&euro;{vatResult.total_amount}</span>
+            </div>
+            {isYearly && (
+              <p className="text-xs text-neutral-500">Billed as &euro;{(parseFloat(vatResult.total_amount) * 12).toFixed(2)}/year</p>
+            )}
+          </div>
+        ) : null}
       </div>
-      {isYearly && (
-        <p className="mt-1 text-sm text-neutral-400">
-          &euro;{displayPrice.toFixed(2)} billed yearly
-        </p>
-      )}
     </div>
   )
 }