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docs: add refactoring plan
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project-docs/refactoring-plan.md
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project-docs/refactoring-plan.md
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# Astrolabe Refactoring Plan
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**Date:** 2025-10-19
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**Goal:** Reduce code duplication and improve maintainability while preserving simplicity
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**Expected Impact:** Reduce codebase by ~400-500 lines (~7-10%)
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---
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## High Impact, Low Effort Refactorings
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### 1. Consolidate Event Handlers in app.js
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**Current:** 795 lines with ~200 lines of repetitive addEventListener calls
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**Target:** ~650-700 lines
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**Savings:** ~100-150 lines
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#### Issues:
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- Lines 118-434 are primarily boilerplate event registration
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- Repetitive patterns for modal open/close
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- Each modal has dedicated open/close functions that just toggle display
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- Event listeners attached individually to each button
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#### Implementation:
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```javascript
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// Generic modal manager
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const ModalManager = {
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open(modalId) {
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const modal = document.getElementById(modalId);
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if (modal) {
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modal.style.display = 'flex';
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this.trackOpen(modalId);
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}
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},
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close(modalId) {
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const modal = document.getElementById(modalId);
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if (modal) modal.style.display = 'none';
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},
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trackOpen(modalId) {
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const trackingMap = {
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'help-modal': 'modal-help',
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'donate-modal': 'modal-donate',
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'settings-modal': 'modal-settings',
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'dataset-modal': 'modal-dataset'
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};
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if (trackingMap[modalId]) {
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Analytics.track(trackingMap[modalId], `Open ${modalId}`);
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}
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}
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};
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// Event delegation for modal closes
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document.addEventListener('click', (e) => {
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// Close buttons
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if (e.target.matches('[id$="-modal-close"]')) {
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const modalId = e.target.id.replace('-close', '');
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ModalManager.close(modalId);
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}
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// Overlay clicks
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if (e.target.classList.contains('modal')) {
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ModalManager.close(e.target.id);
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}
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});
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```
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#### Files to modify:
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- `src/js/app.js` - Consolidate modal handlers
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---
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### 2. Better Utilize generic-storage-ui.js
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**Current:** generic-storage-ui.js exists but is underused
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**Target:** Apply consistently across snippet-manager.js and dataset-manager.js
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**Savings:** ~100-150 lines
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#### Issues:
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- Both managers have duplicate patterns for:
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- List rendering with item selection
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- Linked item display
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- Modal management
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- Form validation
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- Delete confirmations
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- generic-storage-ui.js has the abstractions but they're not fully applied
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#### Duplicated Functions to Consolidate:
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**Snippet Manager:**
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- `renderSnippetList()` → Use `renderGenericList()`
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- `attachSnippetEventListeners()` → Integrated into generic renderer
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- `selectSnippet()` → Use `selectGenericItem()`
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- `updateLinkedDatasets()` → Already uses `updateGenericLinkedItems()` ✓
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- `deleteSnippet()` → Already uses `confirmGenericDeletion()` ✓
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**Dataset Manager:**
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- `renderDatasetList()` → Use `renderGenericList()`
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- `attachDatasetEventListeners()` → Integrated into generic renderer
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- `selectDataset()` → Use `selectGenericItem()`
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- `updateLinkedSnippets()` → Use `updateGenericLinkedItems()`
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- `deleteCurrentDataset()` → Use `confirmGenericDeletion()`
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#### Implementation Strategy:
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1. Enhance `renderGenericList()` to handle ghost cards (e.g., "Create New Snippet")
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2. Add optional transformer for list items (format functions)
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3. Ensure `selectGenericItem()` handles both numeric and string IDs
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4. Update both managers to use generic functions consistently
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#### Files to modify:
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- `src/js/generic-storage-ui.js` - Enhance existing functions
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- `src/js/snippet-manager.js` - Apply generic list/select functions
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- `src/js/dataset-manager.js` - Apply generic list/select functions
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---
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### 3. Simplify user-settings.js
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**Current:** 300 lines with complex dot-path API
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**Target:** ~220-250 lines
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**Savings:** ~50-80 lines
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#### Issues:
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- Dot-path API (`getSetting('editor.fontSize')`) is over-engineered for ~10 settings
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- `validateSetting()` has 40 lines for simple validation
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- Import/export functions (30 lines) appear unused
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- Path parsing logic (20 lines) in getter/setter
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#### Implementation:
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```javascript
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// Simpler API - direct property access
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const settings = getSettings();
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settings.editor.fontSize = 14;
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saveSettings();
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// Or keep helper but simplify:
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function getSetting(path) {
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const [section, key] = path.split('.');
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return userSettings?.[section]?.[key];
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}
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function updateSetting(path, value) {
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const [section, key] = path.split('.');
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if (userSettings[section]) {
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userSettings[section][key] = value;
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return saveSettings();
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}
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return false;
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}
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```
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#### Changes:
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1. Simplify getter/setter - assume 2-level structure (section.key)
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2. Inline validation - check ranges directly in `updateSettings()`
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3. Remove import/export if unused (check usage first)
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4. Keep `formatDate()` logic - it's used throughout UI
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#### Files to modify:
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- `src/js/user-settings.js` - Simplify API and validation
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---
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## Medium Impact, Medium Effort (Future)
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### 4. Refactor config.js into Focused Modules
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**Current:** 257 lines of mixed concerns
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**Target:** Split into 3-4 focused files
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**Savings:** 0 LOC, but improves organization
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#### Proposed Structure:
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```
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src/js/
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state.js - URLState, global variables (editor, currentSnippetId, etc.)
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ui-utils.js - Toast, formatBytes, ModalManager
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analytics.js - Analytics wrapper
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defaults.js - sampleSpec, constants (STORAGE_LIMIT_BYTES, etc.)
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```
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#### Benefits:
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- Easier to find utilities
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- Clearer dependencies
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- Better mental model of what's "global"
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#### Files to create/modify:
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- Create: `src/js/state.js`, `src/js/ui-utils.js`, `src/js/analytics.js`, `src/js/defaults.js`
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- Modify: `src/js/config.js` (delete after migration)
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- Update: `index.html` script tags
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---
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### 5. Extract snippet-drafts.js from snippet-manager.js
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**Current:** snippet-manager.js at 1393 lines handles many concerns
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**Target:** Split draft workflow into separate module
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**Savings:** 0 LOC, but improves maintainability
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#### Functions to Extract:
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- `loadSnippetIntoEditor()`
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- `updateViewModeUI()`
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- `switchViewMode()`
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- `publishDraft()`
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- `revertDraft()`
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- `autoSaveDraft()`
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- `debouncedAutoSave()`
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- `initializeAutoSave()`
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**Lines:** ~200-250 lines → `snippet-drafts.js`
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#### Benefits:
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- Easier to work on CRUD without draft complexity
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- Draft workflow becomes a clear, separate concern
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- Reduces cognitive load when reading snippet-manager.js
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#### Files to create/modify:
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- Create: `src/js/snippet-drafts.js`
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- Modify: `src/js/snippet-manager.js` (remove draft functions)
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- Update: `index.html` script tag order
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---
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## Implementation Order
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### Phase 1: High Impact, Low Effort (This Session)
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1. ✅ Create this refactoring plan
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2. ✅ Consolidate event handlers in app.js (795 → 672 lines, -123)
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3. ✅ Simplify user-settings.js (300 → 224 lines, -76)
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4. ✅ Added ModalManager to config.js (257 → 303 lines, +46)
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5. ⏸️ Enhance and apply generic-storage-ui.js (IN PROGRESS)
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**Net Savings So Far: 153 lines (2.5% reduction)**
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### Phase 2: Medium Effort (Future Session)
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5. Refactor config.js into focused modules
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6. Extract snippet-drafts.js
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---
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## Testing Strategy
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After each refactoring step:
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1. Open `index.html` in browser
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2. Test core workflows:
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- Create/edit/delete snippet
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- Create/edit/delete dataset
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- Draft/publish workflow
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- Search and sort snippets
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- Import/export snippets
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- Settings modal
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- All keyboard shortcuts
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3. Check browser console for errors
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4. Verify localStorage and IndexedDB persistence
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---
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## Rollback Strategy
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- Each refactoring committed separately
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- Git tags for each major step
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- Can revert individual changes via `git revert`
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---
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## Success Metrics
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- **LOC Reduction:** 400-500 lines (~7-10%)
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- **Duplication:** Near-zero between snippet/dataset managers
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- **Complexity:** event handlers reduced from ~30 to ~10
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- **Maintainability:** Adding dataset search becomes trivial (reuse snippet search pattern)
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- **Philosophy:** Code size better matches feature importance
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---
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## Notes
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- Keep changes incremental and testable
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- Preserve all existing functionality
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- Don't introduce new dependencies
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- Maintain vanilla JS approach
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- Update comments for clarity
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