Google auth done

src/lib/components/Splash.svelte

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+<script lang="ts">
+  import { currentStep } from '$lib/stores.js';
+
+  function startWizard() {
+    currentStep.set(1); // Move to auth step
+  }
+</script>
+
+<div class="min-h-screen bg-gray-50 flex items-center justify-center p-4">
+  <div class="container mx-auto max-w-2xl bg-white p-8 rounded-lg shadow-lg text-center">
+    <div class="mb-8">
+      <!-- ESN Logo placeholder -->
+      <div class="mx-auto mb-6 w-24 h-24 bg-blue-600 rounded-full flex items-center justify-center">
+        <span class="text-white text-2xl font-bold">ESN</span>
+      </div>
+      
+      <h1 class="mb-6 text-3xl font-bold text-gray-800">
+        ESN Card Generator
+      </h1>
+      
+      <p class="text-lg text-gray-700 leading-relaxed mb-6">
+        Transform your Google Sheets into professional ESN membership cards with photos.
+        Privacy-first: all processing happens in your browser.
+      </p>
+      
+      <div class="text-sm text-gray-500 mb-8">
+        <p class="mb-2">✓ Import data from Google Sheets</p>
+        <p class="mb-2">✓ Automatic face detection and cropping</p>
+        <p class="mb-2">✓ Generate text and photo PDFs</p>
+        <p>✓ No data stored on our servers</p>
+      </div>
+    </div>
+    
+    <button
+      on:click={startWizard}
+      class="bg-blue-600 text-white px-8 py-3 rounded-lg font-semibold hover:bg-blue-700 transition-colors"
+    >
+      Start Creating Cards
+    </button>
+  </div>
+</div>

src/lib/components/Wizard.svelte

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+<script lang="ts">
+  import { currentStep } from '$lib/stores.js';
+  import StepAuth from './wizard/StepAuth.svelte';
+  // Additional steps to be added as they are implemented
+
+  const steps = [
+    StepAuth
+  ];
+
+  const stepTitles = [
+    'Authenticate'
+  ];
+
+  function goToPreviousStep() {
+    if ($currentStep > 1) {
+      currentStep.update(n => n - 1);
+    }
+  }
+</script>
+
+<div class="min-h-screen bg-gray-50">
+  <div class="container mx-auto max-w-4xl p-4">
+    <!-- Progress indicator -->
+    <div class="bg-white rounded-lg shadow-sm p-6 mb-6">
+      <div class="flex items-center justify-between mb-4">
+        <h1 class="text-2xl font-bold text-gray-800">
+          {stepTitles[$currentStep - 1]}
+        </h1>
+        <span class="text-sm text-gray-500">
+          Step {$currentStep} of {steps.length}
+        </span>
+      </div>
+      
+      <!-- Progress bar -->
+      <div class="w-full bg-gray-200 rounded-full h-2">
+        <div 
+          class="bg-blue-600 h-2 rounded-full transition-all duration-300"
+          style="width: {($currentStep / steps.length) * 100}%"
+        ></div>
+      </div>
+    </div>
+
+    <!-- Step content -->
+    <div class="bg-white rounded-lg shadow-sm">
+      <svelte:component this={steps[$currentStep - 1]} />
+    </div>
+
+    <!-- Navigation -->
+    <div class="flex justify-between mt-6">
+      <button
+        on:click={goToPreviousStep}
+        disabled={$currentStep <= 1}
+        class="px-4 py-2 text-gray-600 bg-gray-100 rounded-lg hover:bg-gray-200 disabled:opacity-50 disabled:cursor-not-allowed"
+      >
+        ← Previous
+      </button>
+    </div>
+  </div>
+</div>

src/lib/components/wizard/StepAuth.svelte

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+<script lang="ts">
+  import { currentStep } from '$lib/stores.js';
+  import { isSignedIn, handleSignIn, handleSignOut, isGoogleApiReady } from '$lib/google';
+
+  function proceed() {
+    currentStep.set(2);
+  }
+</script>
+
+<div class="p-6">
+  <div class="max-w-md mx-auto text-center">
+    <div class="mb-6">
+      <div class="mx-auto mb-4 w-16 h-16 bg-blue-100 rounded-full flex items-center justify-center">
+        <svg class="w-8 h-8 text-blue-600" fill="currentColor" viewBox="0 0 24 24">
+          <path d="M12.017 11.215c-3.573-2.775-9.317-.362-9.317 4.686C2.7 21.833 6.943 24 12.017 24c5.076 0 9.319-2.167 9.319-8.099 0-5.048-5.744-7.461-9.319-4.686z"/>
+          <path d="M20.791 5.016c-1.395-1.395-3.61-1.428-5.024-.033l-1.984 1.984v-.002L12.017 8.73 10.25 6.965l-1.984-1.984c-1.414-1.395-3.629-1.362-5.024.033L1.498 6.758c-1.438 1.438-1.438 3.77 0 5.208l1.744 1.744c1.395 1.395 3.61 1.428 5.024.033l1.984-1.984v.002L12.017 9.996l1.767 1.765 1.984 1.984c1.414 1.395 3.629 1.362 5.024-.033l1.744-1.744c1.438-1.438 1.438-3.77 0-5.208L20.791 5.016z"/>
+        </svg>
+      </div>
+      
+      <h2 class="text-xl font-semibold text-gray-900 mb-2">
+        Connect to Google
+      </h2>
+      
+      <p class="text-sm text-gray-700 leading-relaxed mb-6">
+        Sign in with your Google account to access your Google Sheets and Google Drive for photo downloads.
+      </p>
+      
+      <div class="text-xs text-gray-500 mb-6 space-y-1">
+        <p>Required permissions:</p>
+        <p>• View your Google Spreadsheets</p>
+        <p>• View and manage the files in your Google Drive</p>
+      </div>
+    </div>
+
+    {#if $isSignedIn}
+      <!-- Authenticated state -->
+      <div class="bg-green-50 border border-green-300 rounded-lg p-4 mb-4">
+        <div class="flex items-center justify-center mb-2">
+          <svg class="w-5 h-5 text-green-600 mr-2" fill="currentColor" viewBox="0 0 20 20">
+            <path fill-rule="evenodd" d="M10 18a8 8 0 100-16 8 8 0 000 16zm3.707-9.293a1 1 0 00-1.414-1.414L9 10.586 7.707 9.293a1 1 0 00-1.414 1.414l2 2a1 1 0 001.414 0l4-4z" clip-rule="evenodd"/>
+          </svg>
+          <span class="text-sm font-medium text-green-800">Authenticated</span>
+        </div>
+        
+        <p class="text-sm text-green-800 mb-3">
+          You are signed in.
+        </p>
+        
+        <div class="flex space-x-3 justify-center">
+          <button
+            on:click={proceed}
+            class="bg-blue-600 text-white px-4 py-2 rounded-lg text-sm font-medium hover:bg-blue-700"
+          >
+            Continue →
+          </button>
+          
+          <button
+            on:click={handleSignOut}
+            class="text-red-600 hover:text-red-700 px-4 py-2 text-sm font-medium"
+          >
+            Sign Out
+          </button>
+        </div>
+      </div>
+    {:else}
+      <!-- Unauthenticated state -->
+      <button
+        on:click={handleSignIn}
+        disabled={!$isGoogleApiReady}
+        class="w-full bg-blue-600 text-white px-4 py-3 rounded-lg font-semibold hover:bg-blue-700 transition-colors disabled:bg-gray-400 disabled:cursor-not-allowed"
+      >
+        {#if $isGoogleApiReady}
+          Sign In with Google
+        {:else}
+          Loading Google API...
+        {/if}
+      </button>
+    {/if}
+  </div>
+</div>

src/lib/components/wizard/StepColumnMap.svelte

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+<div class="p-6">
+  <h2 class="text-xl font-semibold text-gray-900">Map Columns</h2>
+  <p class="text-sm text-gray-700">Column mapping functionality will be implemented here.</p>
+</div>

src/lib/components/wizard/StepGallery.svelte

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+<div class="p-6">
+  <h2 class="text-xl font-semibold text-gray-900">Review Photos</h2>
+  <p class="text-sm text-gray-700">Photo gallery and review functionality will be implemented here.</p>
+</div>

src/lib/components/wizard/StepGenerate.svelte

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+<div class="p-6">
+  <h2 class="text-xl font-semibold text-gray-900">Generate PDFs</h2>
+  <p class="text-sm text-gray-700">PDF generation functionality will be implemented here.</p>
+</div>

src/lib/components/wizard/StepRowFilter.svelte

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+<div class="p-6">
+  <h2 class="text-xl font-semibold text-gray-900">Filter Rows</h2>
+  <p class="text-sm text-gray-700">Row filtering functionality will be implemented here.</p>
+</div>

src/lib/google.ts

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+import { writable } from 'svelte/store';
+
+const GOOGLE_CLIENT_ID = import.meta.env.VITE_GOOGLE_CLIENT_ID;
+
+export const isGoogleApiReady = writable(false);
+export const isSignedIn = writable(false);
+
+let tokenClient: google.accounts.oauth2.TokenClient;
+
+const TOKEN_KEY = 'google_oauth_token';
+export function initGoogleClient(callback: () => void) {
+  const script = document.createElement('script');
+  script.src = 'https://apis.google.com/js/api.js';
+  script.onload = () => {
+    gapi.load('client', async () => {
+      await gapi.client.init({
+        // NOTE: API KEY IS NOT REQUIRED FOR THIS IMPLEMENTATION
+        // apiKey: 'YOUR_API_KEY', 
+        discoveryDocs: [
+          'https://www.googleapis.com/discovery/v1/apis/drive/v3/rest',
+          'https://www.googleapis.com/discovery/v1/apis/sheets/v4/rest',
+        ],
+      });
+      isGoogleApiReady.set(true);
+      // Restore token from storage if available
+      const saved = localStorage.getItem(TOKEN_KEY);
+      if (saved) {
+        try {
+          const data = JSON.parse(saved);
+          if (data.access_token && data.expires_at && data.expires_at > Date.now()) {
+            gapi.client.setToken({ access_token: data.access_token });
+            isSignedIn.set(true);
+          } else {
+            localStorage.removeItem(TOKEN_KEY);
+          }
+        } catch {
+          localStorage.removeItem(TOKEN_KEY);
+        }
+      }
+      callback();
+    });
+  };
+  document.body.appendChild(script);
+
+  const scriptGsi = document.createElement('script');
+  scriptGsi.src = 'https://accounts.google.com/gsi/client';
+  scriptGsi.onload = () => {
+    tokenClient = google.accounts.oauth2.initTokenClient({
+      client_id: GOOGLE_CLIENT_ID,
+      scope: 'https://www.googleapis.com/auth/drive.readonly https://www.googleapis.com/auth/spreadsheets.readonly',
+      callback: (tokenResponse) => {
+        if (tokenResponse?.access_token) {
+          // Set token in gapi client
+          gapi.client.setToken({ access_token: tokenResponse.access_token });
+          isSignedIn.set(true);
+          // Persist token with expiration
+          const expiresInSeconds = tokenResponse.expires_in
+            ? Number(tokenResponse.expires_in)
+            : 0;
+          const expiresInMs = expiresInSeconds * 1000;
+          const record = {
+            access_token: tokenResponse.access_token,
+            expires_at: expiresInMs ? Date.now() + expiresInMs : Date.now() + 3600 * 1000
+          };
+          localStorage.setItem(TOKEN_KEY, JSON.stringify(record));
+        }
+      },
+    });
+  };
+  document.body.appendChild(scriptGsi);
+}
+
+export function handleSignIn() {
+  if (gapi.client.getToken() === null) {
+    tokenClient.requestAccessToken({ prompt: 'consent' });
+  } else {
+    tokenClient.requestAccessToken({ prompt: '' });
+  }
+}
+
+export function handleSignOut() {
+  const token = gapi.client.getToken();
+  if (token !== null) {
+    google.accounts.oauth2.revoke(token.access_token, () => {
+      gapi.client.setToken(null);
+      isSignedIn.set(false);
+    });
+  }
+}
+
+export async function searchSheets(query: string) {
+  if (!gapi.client.drive) {
+    throw new Error('Google Drive API not loaded');
+  }
+  const response = await gapi.client.drive.files.list({
+    q: `mimeType='application/vnd.google-apps.spreadsheet' and name contains '${query}'`,
+    fields: 'files(id, name, iconLink, webViewLink)',
+    pageSize: 20,
+  });
+  return response.result.files || [];
+}
+
+export async function getSheetData(spreadsheetId: string, range: string) {
+    if (!gapi.client.sheets) {
+        throw new Error('Google Sheets API not loaded');
+    }
+    const response = await gapi.client.sheets.spreadsheets.values.get({
+        spreadsheetId,
+        range,
+    });
+    return response.result.values || [];
+}

src/lib/stores.ts

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+import { writable, derived } from 'svelte/store';
+
+// User session and authentication
+export const session = writable<{
+  token?: string;
+  user?: { name: string; email: string };
+}>({});
+
+// Raw sheet data after import
+export const rawSheetData = writable<string[][]>([]);
+
+// Column mapping configuration
+export const columnMapping = writable<{
+  name?: number;
+  surname?: number;
+  nationality?: number;
+  birthday?: number;
+  pictureUrl?: number;
+}>({});
+
+// Processed row data after mapping and validation
+export interface RowData {
+  id: string;
+  name: string;
+  surname: string;
+  nationality: string;
+  birthday: string;
+  pictureUrl: string;
+  valid: boolean;
+  included: boolean;
+  age?: number;
+  validationErrors: string[];
+}
+
+export const sheetData = writable<RowData[]>([]);
+
+// Picture storage and metadata
+export interface PictureBlobInfo {
+  id: string;
+  blob: Blob;
+  url: string;
+  downloaded: boolean;
+  faceDetected: boolean;
+  faceCount: number;
+}
+
+export const pictures = writable<Record<string, PictureBlobInfo>>({});
+
+// Crop rectangles for each photo
+export interface Crop {
+  x: number;
+  y: number;
+  width: number;
+  height: number;
+}
+
+export const cropRects = writable<Record<string, Crop>>({});
+
+// Wizard state management
+export const currentStep = writable<number>(0);
+
+export const steps = [
+  'splash',
+  'auth',
+  'search',
+  'mapping',
+  'validation',
+  'gallery',
+  'generate'
+] as const;
+
+export type WizardStep = typeof steps[number];
+
+export const currentStepName = derived(
+  currentStep,
+  ($currentStep) => steps[$currentStep]
+);
+
+// Progress tracking
+export interface ProgressState {
+  stage: string;
+  current: number;
+  total: number;
+  message: string;
+}
+
+export const progress = writable<ProgressState>({
+  stage: '',
+  current: 0,
+  total: 0,
+  message: ''
+});
+
+// Google Sheets list for search
+export interface SheetInfo {
+  id: string;
+  name: string;
+  url: string;
+}
+
+export const availableSheets = writable<SheetInfo[]>([]);
+
+// Selected sheet
+export const selectedSheet = writable<SheetInfo | null>(null);
+
+// Validation derived stores
+export const validRowCount = derived(
+  sheetData,
+  ($sheetData) => $sheetData.filter(row => row.valid && row.included).length
+);
+
+export const invalidRowCount = derived(
+  sheetData,
+  ($sheetData) => $sheetData.filter(row => !row.valid).length
+);
+
+export const totalRowCount = derived(
+  sheetData,
+  ($sheetData) => $sheetData.length
+);
+
+// Face detection status
+export const faceDetectionProgress = writable<{
+  completed: number;
+  total: number;
+  currentImage: string;
+}>({
+  completed: 0,
+  total: 0,
+  currentImage: ''
+});
+
+// PDF generation status
+export const pdfGenerationStatus = writable<{
+  generating: boolean;
+  stage: 'preparing' | 'text-pdf' | 'photo-pdf' | 'complete';
+  progress: number;
+}>({
+  generating: false,
+  stage: 'preparing',
+  progress: 0
+});