From 40a6725bf1349532d09be326db5a52767f6ac126 Mon Sep 17 00:00:00 2001
From: Grzegorz Kucmierz <gkucmierz@gmail.com>
Date: Sun, 8 Feb 2026 16:28:30 +0100
Subject: [PATCH] =?UTF-8?q?i18n:=20automatyczny=20j=C4=99zyk=20+=20r=C4=99?=
 =?UTF-8?q?czny=20prze=C5=82=C4=85cznik?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 src/App.vue                        |  40 +++++++++-
 src/components/CustomGameModal.vue |  12 +--
 src/components/FixedBar.vue        |   8 +-
 src/components/GameActions.vue     |   8 +-
 src/components/GuidePanel.vue      |   8 +-
 src/components/LevelSelector.vue   |  19 +++--
 src/components/StatusPanel.vue     |  10 ++-
 src/components/WinModal.vue        |  10 ++-
 src/composables/useI18n.js         | 113 +++++++++++++++++++++++++++++
 src/composables/useSolver.js       |   8 +-
 src/workers/solverWorker.js        |  59 +++++++++++++--
 11 files changed, 253 insertions(+), 42 deletions(-)
 create mode 100644 src/composables/useI18n.js

diff --git a/src/App.vue b/src/App.vue
index 6bc4988..c948b82 100644
--- a/src/App.vue
+++ b/src/App.vue
@@ -1,6 +1,7 @@
 <script setup>
 import { onMounted, ref } from 'vue';
 import { usePuzzleStore } from './stores/puzzle';
+import { useI18n } from './composables/useI18n';
 import GameBoard from './components/GameBoard.vue';
 import LevelSelector from './components/LevelSelector.vue';
 import StatusPanel from './components/StatusPanel.vue';
@@ -12,6 +13,7 @@ import FixedBar from './components/FixedBar.vue';
 
 // Main App Entry
 const store = usePuzzleStore();
+const { t, locale, setLocale } = useI18n();
 const showCustomModal = ref(false);
 const showGuide = ref(false);
 
@@ -27,7 +29,11 @@ onMounted(() => {
     <FixedBar />
 
     <header class="game-header">
-      <h1>NONOGRAMS</h1>
+      <h1>{{ t('app.title') }}</h1>
+      <div class="lang-toggle">
+        <button class="lang-btn" :class="{ active: locale === 'pl' }" @click="setLocale('pl')">PL</button>
+        <button class="lang-btn" :class="{ active: locale === 'en' }" @click="setLocale('en')">EN</button>
+      </div>
       <div class="underline"></div>
     </header>
 
@@ -96,6 +102,38 @@ h1 {
   box-shadow: 0 0 10px var(--primary-accent);
 }
 
+.lang-toggle {
+  display: inline-flex;
+  gap: 8px;
+  margin-top: 12px;
+  padding: 6px 10px;
+  border-radius: 999px;
+  background: rgba(255, 255, 255, 0.08);
+  border: 1px solid rgba(255, 255, 255, 0.2);
+  box-shadow: 0 0 15px rgba(0, 0, 0, 0.2);
+}
+
+.lang-btn {
+  background: transparent;
+  border: 1px solid rgba(255, 255, 255, 0.2);
+  color: #fff;
+  padding: 4px 10px;
+  border-radius: 999px;
+  font-size: 0.8rem;
+  letter-spacing: 1px;
+  cursor: pointer;
+  transition: all 0.2s ease;
+}
+
+.lang-btn.active {
+  border-color: var(--primary-accent);
+  box-shadow: 0 0 10px rgba(0, 242, 255, 0.3);
+}
+
+.lang-btn:hover {
+  border-color: #fff;
+}
+
 .game-layout {
   display: flex;
   flex-direction: column;
diff --git a/src/components/CustomGameModal.vue b/src/components/CustomGameModal.vue
index 865b381..3a29195 100644
--- a/src/components/CustomGameModal.vue
+++ b/src/components/CustomGameModal.vue
@@ -1,9 +1,11 @@
 <script setup>
 import { ref } from 'vue';
 import { usePuzzleStore } from '@/stores/puzzle';
+import { useI18n } from '@/composables/useI18n';
 
 const emit = defineEmits(['close']);
 const store = usePuzzleStore();
+const { t } = useI18n();
 
 const customSize = ref(10);
 const errorMsg = ref('');
@@ -11,7 +13,7 @@ const errorMsg = ref('');
 const confirm = () => {
   const size = parseInt(customSize.value);
   if (isNaN(size) || size < 5 || size > 100) {
-    errorMsg.value = 'Rozmiar musi być między 5 a 100!';
+    errorMsg.value = t('custom.sizeError');
     return;
   }
   
@@ -23,8 +25,8 @@ const confirm = () => {
 <template>
   <div class="modal-overlay" @click.self="emit('close')">
     <div class="modal glass-panel">
-      <h2>GRA WŁASNA</h2>
-      <p>Wprowadź rozmiar siatki (5 - 100):</p>
+      <h2>{{ t('custom.title') }}</h2>
+      <p>{{ t('custom.prompt') }}</p>
       
       <div class="input-group">
         <input 
@@ -39,8 +41,8 @@ const confirm = () => {
       <p v-if="errorMsg" class="error">{{ errorMsg }}</p>
 
       <div class="actions">
-        <button class="btn-neon secondary" @click="emit('close')">Anuluj</button>
-        <button class="btn-neon" @click="confirm">Start</button>
+        <button class="btn-neon secondary" @click="emit('close')">{{ t('custom.cancel') }}</button>
+        <button class="btn-neon" @click="confirm">{{ t('custom.start') }}</button>
       </div>
     </div>
   </div>
diff --git a/src/components/FixedBar.vue b/src/components/FixedBar.vue
index 19f7ddc..ed424dd 100644
--- a/src/components/FixedBar.vue
+++ b/src/components/FixedBar.vue
@@ -2,9 +2,11 @@
 import { computed, ref } from 'vue';
 import { usePuzzleStore } from '@/stores/puzzle';
 import { useTimer } from '@/composables/useTimer';
+import { useI18n } from '@/composables/useI18n';
 
 const store = usePuzzleStore();
 const { formatTime } = useTimer();
+const { t } = useI18n();
 
 const isVisible = ref(false);
 const isProgressVisible = ref(true); // Toggle for progress percentage
@@ -33,14 +35,14 @@ const toggleVisibility = () => {
   <div id="fixed-bar" :class="{ visible: isVisible }">
     <div class="fixed-content">
       <div class="fixed-stat">
-        <span>Czas:</span>
+        <span>{{ t('fixed.time') }}</span>
         <span>{{ formattedTime }}</span>
       </div>
       
       <div class="fixed-stat">
-        <span>Postęp:</span>
+        <span>{{ t('fixed.progress') }}</span>
         <span style="min-width: 60px; text-align: right;">{{ progressText }}</span>
-        <button class="btn-eye" @click="toggleVisibility" :title="isProgressVisible ? 'Ukryj' : 'Pokaż'">
+        <button class="btn-eye" @click="toggleVisibility" :title="isProgressVisible ? t('fixed.hide') : t('fixed.show')">
            <span v-if="isProgressVisible">👁️</span>
            <span v-else>🔒</span>
         </button>
diff --git a/src/components/GameActions.vue b/src/components/GameActions.vue
index 96e6fa2..290d00e 100644
--- a/src/components/GameActions.vue
+++ b/src/components/GameActions.vue
@@ -1,7 +1,9 @@
 <script setup>
 import { usePuzzleStore } from '@/stores/puzzle';
+import { useI18n } from '@/composables/useI18n';
 
 const store = usePuzzleStore();
+const { t } = useI18n();
 
 function handleNewRandom() {
     // If currently custom, regenerate custom.
@@ -16,9 +18,9 @@ function handleNewRandom() {
 
 <template>
   <div class="game-actions">
-    <button class="btn-neon secondary" @click="store.resetGame">RESET</button>
-    <button class="btn-neon secondary" @click="handleNewRandom">NOWA LOSOWA</button>
-    <button class="btn-neon secondary" @click="store.undo">COFNIJ</button>
+    <button class="btn-neon secondary" @click="store.resetGame">{{ t('actions.reset') }}</button>
+    <button class="btn-neon secondary" @click="handleNewRandom">{{ t('actions.random') }}</button>
+    <button class="btn-neon secondary" @click="store.undo">{{ t('actions.undo') }}</button>
   </div>
 </template>
 
diff --git a/src/components/GuidePanel.vue b/src/components/GuidePanel.vue
index d354ca0..2103145 100644
--- a/src/components/GuidePanel.vue
+++ b/src/components/GuidePanel.vue
@@ -1,5 +1,6 @@
 <script setup>
 import { useSolver } from '@/composables/useSolver';
+import { useI18n } from '@/composables/useI18n';
 
 const { 
     isPlaying, 
@@ -9,6 +10,7 @@ const {
     togglePlay, 
     changeSpeed 
 } = useSolver();
+const { t } = useI18n();
 </script>
 
 <template>
@@ -17,15 +19,15 @@ const {
     
     <div class="guide-controls">
       <button class="btn-neon small" @click="togglePlay" :class="{ active: isPlaying }">
-        {{ isPlaying ? 'PAUSE' : 'PLAY' }}
+        {{ isPlaying ? t('guide.pause') : t('guide.play') }}
       </button>
       
       <button class="btn-neon small" @click="step" :disabled="isPlaying">
-        STEP
+        {{ t('guide.step') }}
       </button>
       
       <button class="btn-neon small" @click="changeSpeed">
-        SPEED: {{ speedLabel }}
+        {{ t('guide.speed') }}: {{ speedLabel }}
       </button>
     </div>
   </div>
diff --git a/src/components/LevelSelector.vue b/src/components/LevelSelector.vue
index c1e570a..4ffbaf5 100644
--- a/src/components/LevelSelector.vue
+++ b/src/components/LevelSelector.vue
@@ -1,13 +1,16 @@
 <script setup>
+import { computed } from 'vue';
 import { usePuzzleStore } from '@/stores/puzzle';
+import { useI18n } from '@/composables/useI18n';
 
 const store = usePuzzleStore();
+const { t } = useI18n();
 
-const levels = [
-  { id: 'easy', label: 'ŁATWY 5X5' },
-  { id: 'medium', label: 'ŚREDNI 10X10' },
-  { id: 'hard', label: 'TRUDNY 15X15' }
-];
+const levels = computed(() => [
+  { id: 'easy', label: t('level.easy') },
+  { id: 'medium', label: t('level.medium') },
+  { id: 'hard', label: t('level.hard') }
+]);
 
 const emit = defineEmits(['open-custom', 'toggle-guide']);
 </script>
@@ -29,14 +32,14 @@ const emit = defineEmits(['open-custom', 'toggle-guide']);
         :class="{ active: store.currentLevelId === 'custom' }"
         @click="emit('open-custom')"
     >
-        WŁASNY
+        {{ t('level.custom') }}
     </button>
 
     <button 
         class="btn-neon guide-btn"
         @click="emit('toggle-guide')"
     >
-        GUIDE ❓
+        {{ t('level.guide') }}
     </button>
   </div>
 </template>
@@ -61,4 +64,4 @@ const emit = defineEmits(['open-custom', 'toggle-guide']);
 .guide-btn {
   /* Specific styling for guide if needed */
 }
-</style>
\ No newline at end of file
+</style>
diff --git a/src/components/StatusPanel.vue b/src/components/StatusPanel.vue
index 18d4660..236ba3a 100644
--- a/src/components/StatusPanel.vue
+++ b/src/components/StatusPanel.vue
@@ -2,9 +2,11 @@
 import { computed } from 'vue';
 import { usePuzzleStore } from '@/stores/puzzle';
 import { useTimer } from '@/composables/useTimer';
+import { useI18n } from '@/composables/useI18n';
 
 const store = usePuzzleStore();
 const { formatTime } = useTimer();
+const { t } = useI18n();
 
 const formattedTime = computed(() => formatTime(store.elapsedTime));
 const progressText = computed(() => `${store.progressPercentage.toFixed(3)}%`);
@@ -13,17 +15,17 @@ const progressText = computed(() => `${store.progressPercentage.toFixed(3)}%`);
 <template>
   <div class="status-panel glass-panel">
     <div class="stat-item">
-      <span class="label">CZAS</span>
+      <span class="label">{{ t('status.time') }}</span>
       <span class="value">{{ formattedTime }}</span>
     </div>
     
     <div class="stat-item">
-      <span class="label">RUCHY</span>
+      <span class="label">{{ t('status.moves') }}</span>
       <span class="value">{{ store.moves }}</span>
     </div>
     
     <div class="stat-item">
-      <span class="label">POSTĘP</span>
+      <span class="label">{{ t('status.progress') }}</span>
       <div class="progress-wrapper">
          <span class="value small">{{ progressText }}</span>
          <span class="eye-icon">👁️</span>
@@ -83,4 +85,4 @@ const progressText = computed(() => `${store.progressPercentage.toFixed(3)}%`);
   opacity: 0.7;
   cursor: pointer;
 }
-</style>
\ No newline at end of file
+</style>
diff --git a/src/components/WinModal.vue b/src/components/WinModal.vue
index b11877a..51cf663 100644
--- a/src/components/WinModal.vue
+++ b/src/components/WinModal.vue
@@ -2,8 +2,10 @@
 import { onMounted, onUnmounted, ref } from 'vue';
 import { Fireworks } from 'fireworks-js';
 import { usePuzzleStore } from '@/stores/puzzle';
+import { useI18n } from '@/composables/useI18n';
 
 const store = usePuzzleStore();
+const { t } = useI18n();
 const fireworksRef = ref(null);
 let fireworksInstance = null;
 let audioContext = null;
@@ -110,18 +112,18 @@ onUnmounted(() => {
   <div class="modal-overlay" @click.self="handleClose">
     <div ref="fireworksRef" class="fireworks-layer"></div>
     <div class="modal glass-panel">
-      <h2>GRATULACJE!</h2>
-      <p>Rozwiązałeś zagadkę!</p>
+      <h2>{{ t('win.title') }}</h2>
+      <p>{{ t('win.message') }}</p>
       
       <div class="stats">
         <div class="stat">
-          <span>Czas:</span>
+          <span>{{ t('win.time') }}</span>
           <strong>{{ store.elapsedTime }}s</strong>
         </div>
       </div>
 
       <div class="actions">
-        <button class="btn-neon" @click="store.resetGame">Zagraj Ponownie</button>
+        <button class="btn-neon" @click="store.resetGame">{{ t('win.playAgain') }}</button>
       </div>
     </div>
   </div>
diff --git a/src/composables/useI18n.js b/src/composables/useI18n.js
new file mode 100644
index 0000000..0a68a3f
--- /dev/null
+++ b/src/composables/useI18n.js
@@ -0,0 +1,113 @@
+import { ref, computed } from 'vue';
+
+const detectLocale = () => {
+  if (typeof navigator === 'undefined') return 'en';
+  const browserLocale = (navigator.languages && navigator.languages[0]) || navigator.language || 'en';
+  const short = browserLocale.toLowerCase().split('-')[0];
+  return short === 'pl' ? 'pl' : 'en';
+};
+
+const messages = {
+  pl: {
+    'app.title': 'Nonograms',
+    'level.easy': 'ŁATWY 5X5',
+    'level.medium': 'ŚREDNI 10X10',
+    'level.hard': 'TRUDNY 15X15',
+    'level.custom': 'WŁASNY',
+    'level.guide': 'PODPOWIEDŹ ❓',
+    'actions.reset': 'RESET',
+    'actions.random': 'NOWA LOSOWA',
+    'actions.undo': 'COFNIJ',
+    'status.time': 'CZAS',
+    'status.moves': 'RUCHY',
+    'status.progress': 'POSTĘP',
+    'fixed.time': 'Czas:',
+    'fixed.progress': 'Postęp:',
+    'fixed.hide': 'Ukryj',
+    'fixed.show': 'Pokaż',
+    'guide.play': 'START',
+    'guide.pause': 'PAUZA',
+    'guide.step': 'KROK',
+    'guide.speed': 'SZYBKOŚĆ',
+    'guide.waiting': 'Oczekiwanie...',
+    'guide.solved': 'Rozwiązane!',
+    'custom.title': 'GRA WŁASNA',
+    'custom.prompt': 'Wprowadź rozmiar siatki (5 - 100):',
+    'custom.cancel': 'Anuluj',
+    'custom.start': 'Start',
+    'custom.sizeError': 'Rozmiar musi być między 5 a 100!',
+    'win.title': 'GRATULACJE!',
+    'win.message': 'Rozwiązałeś zagadkę!',
+    'win.time': 'Czas:',
+    'win.playAgain': 'Zagraj Ponownie'
+  },
+  en: {
+    'app.title': 'Nonograms',
+    'level.easy': 'EASY 5X5',
+    'level.medium': 'MEDIUM 10X10',
+    'level.hard': 'HARD 15X15',
+    'level.custom': 'CUSTOM',
+    'level.guide': 'GUIDE ❓',
+    'actions.reset': 'RESET',
+    'actions.random': 'NEW RANDOM',
+    'actions.undo': 'UNDO',
+    'status.time': 'TIME',
+    'status.moves': 'MOVES',
+    'status.progress': 'PROGRESS',
+    'fixed.time': 'Time:',
+    'fixed.progress': 'Progress:',
+    'fixed.hide': 'Hide',
+    'fixed.show': 'Show',
+    'guide.play': 'PLAY',
+    'guide.pause': 'PAUSE',
+    'guide.step': 'STEP',
+    'guide.speed': 'SPEED',
+    'guide.waiting': 'Waiting...',
+    'guide.solved': 'Solved!',
+    'custom.title': 'CUSTOM GAME',
+    'custom.prompt': 'Enter grid size (5 - 100):',
+    'custom.cancel': 'Cancel',
+    'custom.start': 'Start',
+    'custom.sizeError': 'Size must be between 5 and 100!',
+    'win.title': 'CONGRATULATIONS!',
+    'win.message': 'You solved the puzzle!',
+    'win.time': 'Time:',
+    'win.playAgain': 'Play Again'
+  }
+};
+
+const locale = ref(detectLocale());
+
+const format = (text, params = {}) => {
+  return text.replace(/\{(\w+)\}/g, (_, key) => {
+    const value = params[key];
+    return value === undefined ? `{${key}}` : String(value);
+  });
+};
+
+const t = (key, params) => {
+  const lang = messages[locale.value] || messages.en;
+  const value = lang[key] || messages.en[key] || key;
+  return typeof value === 'string' ? format(value, params) : key;
+};
+
+const setLocale = (value) => {
+  locale.value = messages[value] ? value : 'en';
+  if (typeof document !== 'undefined') {
+    document.documentElement.lang = locale.value;
+    document.title = t('app.title');
+  }
+};
+
+if (typeof document !== 'undefined') {
+  document.documentElement.lang = locale.value;
+  document.title = messages[locale.value]?.['app.title'] || 'Nonograms';
+}
+
+export function useI18n() {
+  return {
+    locale: computed(() => locale.value),
+    t,
+    setLocale
+  };
+}
diff --git a/src/composables/useSolver.js b/src/composables/useSolver.js
index e2406d8..dd17c89 100644
--- a/src/composables/useSolver.js
+++ b/src/composables/useSolver.js
@@ -1,15 +1,17 @@
 import { ref, computed, onUnmounted } from 'vue';
 import { usePuzzleStore } from '@/stores/puzzle';
+import { useI18n } from '@/composables/useI18n';
 
 export function useSolver() {
     const store = usePuzzleStore();
+    const { t, locale } = useI18n();
     
     const isPlaying = ref(false);
     const isProcessing = ref(false);
     const speedIndex = ref(0);
     const speeds = [1000, 500, 250, 125];
     const speedLabels = ['x1', 'x2', 'x3', 'x4'];
-    const statusText = ref('Oczekiwanie...');
+    const statusText = ref(t('guide.waiting'));
     
     let intervalId = null;
     let worker = null;
@@ -18,7 +20,7 @@ export function useSolver() {
     function step() {
         if (store.isGameWon) {
             pause();
-            statusText.value = "Rozwiązane!";
+            statusText.value = t('guide.solved');
             return;
         }
         if (isProcessing.value) return;
@@ -28,7 +30,7 @@ export function useSolver() {
         const playerGrid = store.playerGrid.map(row => row.slice());
         const solution = store.solution.map(row => row.slice());
         const id = ++requestId;
-        worker.postMessage({ id, playerGrid, solution });
+        worker.postMessage({ id, playerGrid, solution, locale: locale.value });
     }
 
     function togglePlay() {
diff --git a/src/workers/solverWorker.js b/src/workers/solverWorker.js
index 2816646..d31b85f 100644
--- a/src/workers/solverWorker.js
+++ b/src/workers/solverWorker.js
@@ -1,5 +1,45 @@
 import { calculateHints } from '../utils/puzzleUtils.js';
 
+const messages = {
+  pl: {
+    'worker.solved': 'Rozwiązane!',
+    'worker.logicRow': 'Logika: Wiersz {row}, Kolumna {col} -> {state}',
+    'worker.logicCol': 'Logika: Kolumna {col}, Wiersz {row} -> {state}',
+    'worker.guess': 'Zgadywanie: Wiersz {row}, Kolumna {col}',
+    'worker.done': 'Koniec!',
+    'worker.state.filled': 'Pełne',
+    'worker.state.empty': 'Puste'
+  },
+  en: {
+    'worker.solved': 'Solved!',
+    'worker.logicRow': 'Logic: Row {row}, Column {col} -> {state}',
+    'worker.logicCol': 'Logic: Column {col}, Row {row} -> {state}',
+    'worker.guess': 'Guessing: Row {row}, Column {col}',
+    'worker.done': 'Done!',
+    'worker.state.filled': 'Filled',
+    'worker.state.empty': 'Empty'
+  }
+};
+
+const resolveLocale = (value) => {
+  if (!value) return 'en';
+  const short = String(value).toLowerCase().split('-')[0];
+  return short === 'pl' ? 'pl' : 'en';
+};
+
+const format = (text, params = {}) => {
+  return text.replace(/\{(\w+)\}/g, (_, key) => {
+    const value = params[key];
+    return value === undefined ? `{${key}}` : String(value);
+  });
+};
+
+const t = (locale, key, params) => {
+  const lang = messages[locale] || messages.en;
+  const value = lang[key] || messages.en[key] || key;
+  return typeof value === 'string' ? format(value, params) : key;
+};
+
 const getPermutations = (length, hints) => {
   const results = [];
   const recurse = (index, hintIndex, currentLine) => {
@@ -73,9 +113,9 @@ const isSolved = (grid, solution) => {
   return true;
 };
 
-const handleStep = (playerGrid, solution) => {
+const handleStep = (playerGrid, solution, locale) => {
   if (isSolved(playerGrid, solution)) {
-    return { type: 'done', statusText: 'Rozwiązane!' };
+    return { type: 'done', statusText: t(locale, 'worker.solved') };
   }
 
   const size = solution.length;
@@ -86,12 +126,13 @@ const handleStep = (playerGrid, solution) => {
     const hints = rowHints[r];
     const result = solveLineLogic(rowLine, hints, size);
     if (result.index !== -1) {
+      const stateLabel = t(locale, result.state === 1 ? 'worker.state.filled' : 'worker.state.empty');
       return {
         type: 'move',
         r,
         c: result.index,
         state: result.state,
-        statusText: `Logika: Wiersz ${r + 1}, Kolumna ${result.index + 1} -> ${result.state === 1 ? 'Pełne' : 'Puste'}`
+        statusText: t(locale, 'worker.logicRow', { row: r + 1, col: result.index + 1, state: stateLabel })
       };
     }
   }
@@ -102,12 +143,13 @@ const handleStep = (playerGrid, solution) => {
     const hints = colHints[c];
     const result = solveLineLogic(colLine, hints, size);
     if (result.index !== -1) {
+      const stateLabel = t(locale, result.state === 1 ? 'worker.state.filled' : 'worker.state.empty');
       return {
         type: 'move',
         r: result.index,
         c,
         state: result.state,
-        statusText: `Logika: Kolumna ${c + 1}, Wiersz ${result.index + 1} -> ${result.state === 1 ? 'Pełne' : 'Puste'}`
+        statusText: t(locale, 'worker.logicCol', { row: result.index + 1, col: c + 1, state: stateLabel })
       };
     }
   }
@@ -128,17 +170,18 @@ const handleStep = (playerGrid, solution) => {
           r,
           c,
           state: newState,
-          statusText: `Zgadywanie: Wiersz ${r + 1}, Kolumna ${c + 1}`
+          statusText: t(locale, 'worker.guess', { row: r + 1, col: c + 1 })
         };
       }
     }
   }
 
-  return { type: 'done', statusText: 'Koniec!' };
+  return { type: 'done', statusText: t(locale, 'worker.done') };
 };
 
 self.onmessage = (event) => {
-  const { id, playerGrid, solution } = event.data;
-  const result = handleStep(playerGrid, solution);
+  const { id, playerGrid, solution, locale } = event.data;
+  const resolved = resolveLocale(locale);
+  const result = handleStep(playerGrid, solution, resolved);
   self.postMessage({ id, ...result });
 };