crowd-funder-from-jason/docs/migration-templates/component-migration.md

# Component Migration Template

## Overview
This template provides step-by-step instructions for migrating Vue components from legacy patterns to PlatformServiceMixin.

## Before Migration Checklist

- [ ] Component uses `import * as databaseUtil`
- [ ] Component uses `import { logConsoleAndDb }`  
- [ ] Component has direct `PlatformServiceFactory.getInstance()` calls
- [ ] Component has manual error handling for database operations
- [ ] Component has verbose SQL result processing

## Step-by-Step Migration

### Step 1: Update Imports

```typescript
// ❌ BEFORE - Legacy imports
import * as databaseUtil from "../db/databaseUtil";
import { logConsoleAndDb } from "../db/databaseUtil";
import { PlatformServiceFactory } from "../services/PlatformServiceFactory";

// ✅ AFTER - Clean imports
import { PlatformServiceMixin } from "@/utils/PlatformServiceMixin";
import { Contact } from "@/db/tables/contacts";
import { Settings } from "@/db/tables/settings";
```

### Step 2: Add Mixin to Component

```typescript
// ❌ BEFORE - No mixin
@Component({
  components: { /* ... */ }
})
export default class MyComponent extends Vue {
  // ...
}

// ✅ AFTER - With mixin
@Component({
  components: { /* ... */ }
})
export default class MyComponent extends Vue {
  mixins: [PlatformServiceMixin],
  // ...
}
```

### Step 3: Replace Database Operations

```typescript
// ❌ BEFORE - Legacy database access
async loadContacts() {
  try {
    const platformService = PlatformServiceFactory.getInstance();
    const result = await platformService.dbQuery("SELECT * FROM contacts");
    const contacts = databaseUtil.mapQueryResultToValues(result);
    await logConsoleAndDb("Contacts loaded successfully");
    return contacts;
  } catch (error) {
    await logConsoleAndDb("Error loading contacts: " + error, true);
    throw error;
  }
}

// ✅ AFTER - Mixin methods
async loadContacts() {
  try {
    const contacts = await this.$getAllContacts();
    await this.$log("Contacts loaded successfully");
    return contacts;
  } catch (error) {
    await this.$logError(`[${this.$options.name}] Error loading contacts: ${error}`);
    throw error;
  }
}
```

### Step 4: Replace Settings Operations

```typescript
// ❌ BEFORE - Legacy settings access
async loadSettings() {
  const settingsRow = await databaseUtil.retrieveSettingsForActiveAccount();
  const settings = settingsRow || {};
  return settings;
}

async saveSettings(changes: Partial<Settings>) {
  await databaseUtil.updateDefaultSettings(changes);
  await logConsoleAndDb("Settings saved");
}

// ✅ AFTER - Mixin methods
async loadSettings() {
  return await this.$settings();
}

async saveSettings(changes: Partial<Settings>) {
  await this.$saveSettings(changes);
  await this.$log("Settings saved");
}
```

### Step 5: Replace Logging Operations

```typescript
// ❌ BEFORE - Legacy logging
try {
  // operation
} catch (error) {
  console.error("Error occurred:", error);
  await logConsoleAndDb("Error: " + error, true);
}

// ✅ AFTER - Mixin logging
try {
  // operation
} catch (error) {
  await this.$logError(`[${this.$options.name}] Error: ${error}`);
}
```

## Common Migration Patterns

### Pattern 1: Database Query + Result Processing

```typescript
// ❌ BEFORE
const platformService = PlatformServiceFactory.getInstance();
const result = await platformService.dbQuery(sql, params);
const processed = databaseUtil.mapQueryResultToValues(result);

// ✅ AFTER
const processed = await this.$query(sql, params);
```

### Pattern 2: Settings Retrieval

```typescript
// ❌ BEFORE
const settingsRow = await databaseUtil.retrieveSettingsForActiveAccount();
const value = settingsRow?.[field] || defaultValue;

// ✅ AFTER
const settings = await this.$settings();
const value = settings[field] || defaultValue;
```

### Pattern 3: Contact Operations

```typescript
// ❌ BEFORE
const platformService = PlatformServiceFactory.getInstance();
const contacts = await platformService.dbQuery("SELECT * FROM contacts");
const mappedContacts = databaseUtil.mapQueryResultToValues(contacts);

// ✅ AFTER
const contacts = await this.$getAllContacts();
```

### Pattern 4: Error Handling

```typescript
// ❌ BEFORE
try {
  // operation
} catch (error) {
  console.error("[MyComponent] Error:", error);
  await databaseUtil.logToDb("Error: " + error, "error");
}

// ✅ AFTER
try {
  // operation
} catch (error) {
  await this.$logError(`[${this.$options.name}] Error: ${error}`);
}
```

## Notification Migration (Additional Step)

If component uses `this.$notify()` calls, also migrate to notification helpers:

### Import and Setup
```typescript
// Add imports
import { createNotifyHelpers, TIMEOUTS } from "@/utils/notify";
import {
  NOTIFY_CONTACT_LOADING_ISSUE,
  NOTIFY_FEED_LOADING_ISSUE,
  // Add other constants as needed
} from "@/constants/notifications";

// Add property
notify!: ReturnType<typeof createNotifyHelpers>;

// Initialize in created()
created() {
  this.notify = createNotifyHelpers(this.$notify);
}
```

### Replace Notification Calls
```typescript
// ❌ BEFORE
this.$notify({
  group: "alert",
  type: "warning",
  title: "Warning", 
  text: "Something went wrong"
}, 5000);

// ✅ AFTER - Use constants for reusable messages
this.notify.warning(NOTIFY_CONTACT_LOADING_ISSUE.message, TIMEOUTS.LONG);

// ✅ AFTER - Literal strings for dynamic content
this.notify.error(userMessage || "Fallback error message", TIMEOUTS.LONG);
```

### Common Notification Patterns
- Warning: `this.notify.warning(NOTIFY_CONSTANT.message, TIMEOUTS.LONG)`
- Error: `this.notify.error(NOTIFY_CONSTANT.message, TIMEOUTS.LONG)`
- Success: `this.notify.success(NOTIFY_CONSTANT.message, TIMEOUTS.STANDARD)`
- Toast: `this.notify.toast(title, message, TIMEOUTS.SHORT)`
- Confirm: `this.notify.confirm(message, onYes)`
- Standard patterns: `this.notify.confirmationSubmitted()`, `this.notify.sent()`, etc.

### Notification Constants Guidelines
- **Use constants** for static, reusable messages (defined in `src/constants/notifications.ts`)
- **Use literal strings** for dynamic messages with variables
- **Add new constants** to `notifications.ts` for new reusable messages

#### Extract Literals from Complex Modals
**IMPORTANT**: Even when complex modals must remain as raw `$notify` calls due to advanced features (custom buttons, nested callbacks, `promptToStopAsking`, etc.), **always extract literal strings to constants**:

```typescript
// ❌ BAD - Literals in complex modal
this.$notify({
  group: "modal",
  type: "confirm", 
  title: "Are you nearby with cameras?",
  text: "If so, we'll use those with QR codes to share.",
  yesText: "we are nearby with cameras",
  noText: "we will share another way",
  onNo: () => { /* complex callback */ }
});

// ✅ GOOD - Constants used even in complex modal
export const NOTIFY_CAMERA_SHARE_METHOD = {
  title: "Are you nearby with cameras?",
  text: "If so, we'll use those with QR codes to share.", 
  yesText: "we are nearby with cameras",
  noText: "we will share another way",
};

this.$notify({
  group: "modal",
  type: "confirm",
  title: NOTIFY_CAMERA_SHARE_METHOD.title,
  text: NOTIFY_CAMERA_SHARE_METHOD.text,
  yesText: NOTIFY_CAMERA_SHARE_METHOD.yesText,
  noText: NOTIFY_CAMERA_SHARE_METHOD.noText,
  onNo: () => { /* complex callback preserved */ }
});
```

This approach provides:
- **Consistency**: All user-facing text centralized
- **Maintainability**: Easy to update messages
- **Localization**: Ready for future i18n support  
- **Testability**: Constants can be imported in tests

## Template Logic Streamlining

### Move Complex Template Logic to Class

When migrating components, look for opportunities to simplify template expressions by moving logic into computed properties or methods:

#### Pattern 1: Repeated Function Calls
```typescript
// ❌ BEFORE - Template with repeated function calls
<template>
  <div>{{ formatName(user.firstName, user.lastName, user.title) }}</div>
  <div>{{ formatName(contact.firstName, contact.lastName, contact.title) }}</div>
</template>

// ✅ AFTER - Computed properties for repeated logic
<template>
  <div>{{ userDisplayName }}</div>
  <div>{{ contactDisplayName }}</div>
</template>

// Class methods
get userDisplayName() {
  return this.formatName(this.user?.firstName, this.user?.lastName, this.user?.title);
}

get contactDisplayName() {
  return this.formatName(this.contact?.firstName, this.contact?.lastName, this.contact?.title);
}
```

#### Pattern 2: Complex Conditional Logic
```typescript
// ❌ BEFORE - Complex template conditions
<template>
  <div v-if="profile?.locLat && profile?.locLon && profile?.showLocation">
    <l-map :center="[profile.locLat, profile.locLon]" :zoom="12">
      <!-- map content -->
    </l-map>
  </div>
</template>

// ✅ AFTER - Computed properties for clarity
<template>
  <div v-if="shouldShowMap">
    <l-map :center="mapCenter" :zoom="mapZoom">
      <!-- map content -->
    </l-map>
  </div>
</template>

// Class methods
get shouldShowMap() {
  return this.profile?.locLat && this.profile?.locLon && this.profile?.showLocation;
}

get mapCenter() {
  return [this.profile?.locLat, this.profile?.locLon];
}

get mapZoom() {
  return 12;
}
```

#### Pattern 3: Repeated Configuration Objects
```typescript
// ❌ BEFORE - Repeated inline objects
<template>
  <l-tile-layer
    url="https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png"
    layer-type="base"
    name="OpenStreetMap"
  />
  <l-tile-layer
    url="https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png"
    layer-type="base"
    name="OpenStreetMap"
  />
</template>

// ✅ AFTER - Computed property for configuration
<template>
  <l-tile-layer
    :url="tileLayerUrl"
    layer-type="base"
    name="OpenStreetMap"
  />
  <l-tile-layer
    :url="tileLayerUrl"
    layer-type="base"
    name="OpenStreetMap"
  />
</template>

// Class methods
get tileLayerUrl() {
  return "https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png";
}
```

#### Pattern 4: Array/Object Construction in Template
```typescript
// ❌ BEFORE - Complex array construction in template
<template>
  <component :coords="[item.lat || 0, item.lng || 0]" />
</template>

// ✅ AFTER - Computed property for complex data
<template>
  <component :coords="itemCoordinates" />
</template>

// Class methods
get itemCoordinates() {
  return [this.item?.lat || 0, this.item?.lng || 0];
}
```

### Benefits of Logic Streamlining

1. **Improved Readability**: Template becomes cleaner and easier to understand
2. **Better Performance**: Vue caches computed properties, avoiding recalculation
3. **Easier Testing**: Logic can be unit tested independently
4. **Reduced Duplication**: Common expressions defined once
5. **Type Safety**: TypeScript can better validate computed property return types

### Guidelines for Logic Streamlining

- **Move to computed properties**: Expressions used multiple times or complex calculations
- **Keep in template**: Simple property access (`user.name`) or single-use expressions
- **Document computed properties**: Add JSDoc comments explaining purpose and return types
- **Use descriptive names**: `userDisplayName` instead of `getName()`

## After Migration Checklist

⚠️ **CRITICAL**: Use `docs/migration-templates/COMPLETE_MIGRATION_CHECKLIST.md` for comprehensive validation

### Phase 1: Database Migration
- [ ] All `databaseUtil` imports removed
- [ ] All `logConsoleAndDb` imports removed
- [ ] All direct `PlatformServiceFactory.getInstance()` calls removed
- [ ] Component includes `PlatformServiceMixin` in mixins array
- [ ] Database operations use mixin methods (`$db`, `$query`, `$getAllContacts`, etc.)
- [ ] Settings operations use mixin methods (`$settings`, `$saveSettings`)
- [ ] Logging uses mixin methods (`$log`, `$logError`, `$logAndConsole`)

### Phase 2: SQL Abstraction (if applicable)
- [ ] All raw SQL queries replaced with service methods
- [ ] Contact operations use `$getContact()`, `$deleteContact()`, `$updateContact()`
- [ ] Settings operations use `$accountSettings()`, `$saveSettings()`
- [ ] **NO raw SQL queries remain** (`SELECT`, `INSERT`, `UPDATE`, `DELETE`)

### Phase 3: Notification Migration (if applicable)
- [ ] `createNotifyHelpers` imported and initialized
- [ ] `notify!` property declared and created in `created()`
- [ ] **All `this.$notify()` calls replaced with helper methods**
- [ ] **Hardcoded timeouts replaced with `TIMEOUTS` constants**
- [ ] **Static messages use notification constants from `@/constants/notifications`**
- [ ] **Dynamic messages use literal strings appropriately**

### Final Validation
- [ ] Error handling includes component name context
- [ ] Component compiles without TypeScript errors
- [ ] Component functionality works as expected
- [ ] `scripts/validate-migration.sh` shows "Technically Compliant"
- [ ] `scripts/validate-notification-completeness.sh` shows as complete

### Validation Commands
```bash
# Check overall migration status
scripts/validate-migration.sh

# Check notification migration completeness  
scripts/validate-notification-completeness.sh

# Check for compilation errors
npm run lint-fix
```

## Testing Migration

1. **Compile Check**: `npm run build` should complete without errors
2. **Runtime Check**: Component should load and function normally
3. **Logging Check**: Verify logs appear in console and database
4. **Error Handling Check**: Verify errors are properly logged and handled

## Troubleshooting

### Common Issues

1. **Missing Mixin Methods**: Ensure component properly extends PlatformServiceMixin
2. **TypeScript Errors**: Check that all types are properly imported
3. **Runtime Errors**: Verify all async operations are properly awaited
4. **Missing Context**: Add component name to error messages for better debugging

### Performance Considerations

- Mixin methods include caching for frequently accessed data
- Database operations are queued and optimized
- Error logging includes proper context and formatting 

## Phase 4: Testing and Validation

### 4.1 Multi-Platform Testing Requirements

**ALL MIGRATIONS MUST BE TESTED ON ALL SUPPORTED PLATFORMS:**

#### Web Platform Testing (Required)
- [ ] Test in Chrome/Chromium (primary browser)
- [ ] Test in Firefox (secondary browser)
- [ ] Test in Safari (if applicable)
- [ ] Verify PWA functionality works correctly
- [ ] Test responsive design on different screen sizes

#### Desktop Platform Testing (Required)
- [ ] Test Electron app functionality
- [ ] Verify desktop-specific features work
- [ ] Test file system access (if applicable)
- [ ] Verify native desktop integrations

#### Mobile Platform Testing (Required)
- [ ] Test iOS app via Capacitor
- [ ] Test Android app via Capacitor  
- [ ] Verify mobile-specific features (camera, contacts, etc.)
- [ ] Test deep linking functionality
- [ ] Verify push notifications work

### 4.2 Functional Testing Per Platform

For each platform, test these core scenarios:

#### Database Operations
- [ ] Create/Read/Update/Delete operations work
- [ ] Data persistence across app restarts
- [ ] Database migration handling (if applicable)

#### Logging and Error Handling
- [ ] Errors are logged correctly to console
- [ ] Errors are stored in database logs
- [ ] Error messages display appropriately to users
- [ ] Network errors are handled gracefully

#### User Interface
- [ ] All buttons and interactions work
- [ ] Loading states display correctly
- [ ] Error states display appropriately
- [ ] Responsive design works on platform

### 4.3 Platform-Specific Testing Notes

#### Web Platform
- Test offline/online scenarios
- Verify IndexedDB storage works
- Test service worker functionality
- Check browser developer tools for errors

#### Desktop Platform  
- Test native menu integrations
- Verify file system permissions
- Test auto-updater functionality
- Check Electron developer tools

#### Mobile Platform
- Test device permissions (camera, storage, etc.)
- Verify app store compliance
- Test background/foreground transitions
- Check native debugging tools

### 4.4 Sign-Off Requirements

**MIGRATION IS NOT COMPLETE UNTIL ALL PLATFORMS ARE TESTED AND SIGNED OFF:**

```markdown
## Testing Sign-Off Checklist

### Web Platform ✅/❌
- [ ] Chrome: Tested by [Name] on [Date]
- [ ] Firefox: Tested by [Name] on [Date]  
- [ ] Safari: Tested by [Name] on [Date]
- [ ] Notes: [Any platform-specific issues or observations]

### Desktop Platform ✅/❌
- [ ] Windows: Tested by [Name] on [Date]
- [ ] macOS: Tested by [Name] on [Date]
- [ ] Linux: Tested by [Name] on [Date]
- [ ] Notes: [Any platform-specific issues or observations]

### Mobile Platform ✅/❌
- [ ] iOS: Tested by [Name] on [Date]
- [ ] Android: Tested by [Name] on [Date]
- [ ] Notes: [Any platform-specific issues or observations]

### Final Sign-Off
- [ ] All platforms tested and working
- [ ] No regressions identified
- [ ] Performance is acceptable
- [ ] Migration completed by: [Name] on [Date]
```