From 93299b1c79ec8f69233ca45c3ecef81abc2a82bd Mon Sep 17 00:00:00 2001
From: Oleh Omelchenko <ptrvtch@protonmail.com>
Date: Mon, 24 Nov 2025 22:22:03 +0200
Subject: [PATCH] feat: implement meta fields with auto-save functionality
 using Alpine.js

---
 index.html                            | 14 +++-
 project-docs/alpine-migration-plan.md | 34 +++++++---
 src/js/snippet-manager.js             | 95 +++++++++++++--------------
 3 files changed, 83 insertions(+), 60 deletions(-)

diff --git a/index.html b/index.html
index 7b49148..bd149b0 100644
--- a/index.html
+++ b/index.html
@@ -152,10 +152,20 @@
                     </div>
                     <div class="snippet-meta" id="snippet-meta" style="display: none;">
                         <div class="meta-header">Name</div>
-                        <input type="text" id="snippet-name" class="input small" placeholder="Snippet name..." />
+                        <input type="text"
+                               id="snippet-name"
+                               class="input small"
+                               placeholder="Snippet name..."
+                               x-model="snippetName"
+                               @input="saveMetaDebounced()" />
 
                         <div class="meta-header">Comment</div>
-                        <textarea id="snippet-comment" class="input textarea medium" placeholder="Add a comment..." rows="3"></textarea>
+                        <textarea id="snippet-comment"
+                                  class="input textarea medium"
+                                  placeholder="Add a comment..."
+                                  rows="3"
+                                  x-model="snippetComment"
+                                  @input="saveMetaDebounced()"></textarea>
 
                         <div class="meta-info">
                             <div class="meta-info-item">
diff --git a/project-docs/alpine-migration-plan.md b/project-docs/alpine-migration-plan.md
index 984e3ca..14936ce 100644
--- a/project-docs/alpine-migration-plan.md
+++ b/project-docs/alpine-migration-plan.md
@@ -211,25 +211,39 @@ Chart builder form with dataset selection, chart type, and field mappings.
 
 ---
 
-## Phase 6: Meta Fields (Name, Comment)
+## Phase 6: Meta Fields (Name, Comment) ✅ COMPLETE
 
-**Status**: Planned
+**Status**: Done
 **Files**: `index.html`, `src/js/snippet-manager.js`
 
-### What to Convert
+### What Was Converted
 
-Name and comment fields with auto-save functionality.
+- Name and comment input fields with `x-model` bindings
+- Debounced auto-save functionality moved to Alpine component
+- Metadata loading when snippet is selected
 
 ### Implementation Approach
 
-1. Add `snippetName` and `snippetComment` to `snippetList()` component
-2. Use `x-model` with debounced input handlers
-3. Call `loadMetadata()` when snippet selected
-4. Auto-save on change with 500ms debounce
+1. Added `snippetName` and `snippetComment` properties to `snippetList()` component
+2. Added `loadMetadata()` method to load fields when snippet selected
+3. Added `saveMetaDebounced()` and `saveMeta()` methods for auto-saving
+4. Converted HTML inputs to use `x-model` with `@input="saveMetaDebounced()"`
+5. Updated `selectSnippet()` to call Alpine component's `loadMetadata()` via `_x_dataStack`
+6. Removed vanilla event listeners and old `autoSaveMeta()`/`debouncedAutoSaveMeta()` functions
 
 ### What Stays Vanilla
 
-- SnippetStorage save operations
+- SnippetStorage save operations (called from Alpine component)
+- Name generation logic (generateSnippetName)
+- Snippet list re-rendering after save
+
+### Key Learnings
+
+- Alpine's `x-model` provides two-way data binding for inputs
+- `@input` event handler triggers debounced save on every keystroke
+- Alpine component accessed via DOM element's `_x_dataStack[0]` property
+- Debounce timeout stored in component state for proper cleanup
+- Net code reduction: ~40 lines of manual event listener setup removed
 
 ---
 
@@ -284,7 +298,7 @@ Toast notification system with auto-dismiss.
 2. ✅ **Phase 2: Dataset Manager** - DONE
 3. ✅ **Phase 3: View Mode Toggle** - DONE
 4. ✅ **Phase 4: Settings Modal** - DONE
-5. **Phase 6: Meta Fields** - Before Chart Builder (simpler)
+5. ✅ **Phase 6: Meta Fields** - DONE
 6. **Phase 7: Panel Toggles** - Quick win
 7. **Phase 5: Chart Builder** - More complex, save for when confident
 8. **Phase 8: Toast Notifications** - Optional polish
diff --git a/src/js/snippet-manager.js b/src/js/snippet-manager.js
index e147a5c..fe7f340 100644
--- a/src/js/snippet-manager.js
+++ b/src/js/snippet-manager.js
@@ -17,6 +17,11 @@ function snippetList() {
         sortBy: AppSettings.get('sortBy') || 'modified',
         sortOrder: AppSettings.get('sortOrder') || 'desc',
 
+        // Meta fields for selected snippet
+        snippetName: '',
+        snippetComment: '',
+        metaSaveTimeout: null,
+
         // Computed property: calls SnippetStorage with current filters/sort
         get filteredSnippets() {
             return SnippetStorage.listSnippets(
@@ -62,6 +67,34 @@ function snippetList() {
             return JSON.stringify(snippet.spec) !== JSON.stringify(snippet.draftSpec);
         },
 
+        // Load meta fields when a snippet is selected
+        loadMetadata(snippet) {
+            this.snippetName = snippet.name || '';
+            this.snippetComment = snippet.comment || '';
+        },
+
+        // Save meta fields with debouncing (called via x-model watchers)
+        saveMetaDebounced() {
+            clearTimeout(this.metaSaveTimeout);
+            this.metaSaveTimeout = setTimeout(() => this.saveMeta(), 1000);
+        },
+
+        // Save meta fields to storage
+        saveMeta() {
+            const snippet = getCurrentSnippet();
+            if (snippet) {
+                snippet.name = this.snippetName.trim() || generateSnippetName();
+                snippet.comment = this.snippetComment;
+                SnippetStorage.saveSnippet(snippet);
+
+                // Update the snippet list display to reflect the new name
+                renderSnippetList();
+
+                // Restore selection after re-render
+                restoreSnippetSelection();
+            }
+        },
+
         // Actions
         selectSnippet(snippetId) {
             window.selectSnippet(snippetId);
@@ -469,16 +502,21 @@ function selectSnippet(snippetId, updateURL = true) {
 
     // Show and populate meta fields
     const metaSection = document.getElementById('snippet-meta');
-    const nameField = document.getElementById('snippet-name');
-    const commentField = document.getElementById('snippet-comment');
     const createdField = document.getElementById('snippet-created');
     const modifiedField = document.getElementById('snippet-modified');
     const placeholder = document.querySelector('.placeholder');
 
-    if (metaSection && nameField && commentField) {
+    if (metaSection) {
         metaSection.style.display = 'block';
-        nameField.value = snippet.name || '';
-        commentField.value = snippet.comment || '';
+
+        // Load metadata into Alpine component
+        const snippetPanel = document.getElementById('snippet-panel');
+        if (snippetPanel && snippetPanel._x_dataStack) {
+            const alpineData = snippetPanel._x_dataStack[0];
+            if (alpineData && typeof alpineData.loadMetadata === 'function') {
+                alpineData.loadMetadata(snippet);
+            }
+        }
 
         // Format and display dates
         if (createdField) {
@@ -488,7 +526,9 @@ function selectSnippet(snippetId, updateURL = true) {
             modifiedField.textContent = formatFullDate(snippet.modified);
         }
 
-        placeholder.style.display = 'none';
+        if (placeholder) {
+            placeholder.style.display = 'none';
+        }
     }
 
     // Store currently selected snippet ID globally
@@ -612,21 +652,7 @@ function debouncedAutoSave() {
 
 // Initialize auto-save on editor changes
 function initializeAutoSave() {
-    // Initialize meta fields auto-save
-    const nameField = document.getElementById('snippet-name');
-    const commentField = document.getElementById('snippet-comment');
-
-    if (nameField) {
-        nameField.addEventListener('input', () => {
-            debouncedAutoSaveMeta();
-        });
-    }
-
-    if (commentField) {
-        commentField.addEventListener('input', () => {
-            debouncedAutoSaveMeta();
-        });
-    }
+    // Meta fields auto-save now handled by Alpine.js in snippetList() component
 
     // Initialize button event listeners
     const duplicateBtn = document.getElementById('duplicate-btn');
@@ -649,33 +675,6 @@ function initializeAutoSave() {
     }
 }
 
-// Save meta fields (name and comment) for the selected snippet
-function autoSaveMeta() {
-    const nameField = document.getElementById('snippet-name');
-    const commentField = document.getElementById('snippet-comment');
-    if (!nameField || !commentField) return;
-
-    const snippet = getCurrentSnippet();
-    if (snippet) {
-        snippet.name = nameField.value.trim() || generateSnippetName();
-        snippet.comment = commentField.value;
-        SnippetStorage.saveSnippet(snippet);
-
-        // Update the snippet list display to reflect the new name
-        renderSnippetList();
-
-        // Restore selection after re-render
-        restoreSnippetSelection();
-    }
-}
-
-// Debounced meta auto-save
-let metaAutoSaveTimeout;
-function debouncedAutoSaveMeta() {
-    clearTimeout(metaAutoSaveTimeout);
-    metaAutoSaveTimeout = setTimeout(autoSaveMeta, 1000);
-}
-
 // CRUD Operations
 
 // Create new snippet