LingoLM-9

[OuiHui]

Description

This PR implements a production-ready card templating and persistence system for LingoLM. The system provides a clean architecture for creating language learning cards from AI-generated linguistic data and storing them in user profiles.

Key Components:

• Type System - Comprehensive TypeScript interfaces for BaseCardInput and BaseCard
• Templating Service - Pure functions that convert raw linguistic data into structured JSON cards
• Storage Abstraction - Database-agnostic interface with in-memory implementation
• RESTful API - Complete CRUD endpoints for card management
• Input Validation - Robust validation with descriptive error messages

Architecture Highlights:

• Clean separation of concerns (templating, storage, API)
• Storage provider pattern for easy database swapping
• Immutable card design with versioning support
• Type-safe throughout with full TypeScript support

Type of change

• New feature
• Bug fix
• Breaking change
• Documentation update

Files Added

Core Services

• app/lib/types/card.types.ts - TypeScript interfaces for cards and user profiles
• app/lib/services/cardTemplating.ts - Card creation and validation functions
• app/lib/services/cardStorage.ts - Storage abstraction and in-memory implementation
• app/lib/services/README.md - Service documentation

API Endpoints

• app/app/api/cards/route.ts - POST (create), GET (list all)
• app/app/api/cards/[cardId]/route.ts - GET (retrieve), PUT (update), DELETE (remove)

Configuration

• app/.env.example - Environment configuration template

API Endpoints

POST   /api/cards          - Create new card
GET    /api/cards          - Get all user's cards  
GET    /api/cards/:id      - Get specific card
PUT    /api/cards/:id      - Update card (versioned)
DELETE /api/cards/:id      - Delete card

Example Usage

import { createBaseCard } from "@/lib/services/cardTemplating";
import { getCardStorage } from "@/lib/services/cardStorage";

// Create a card from AI-generated data
const card = createBaseCard({
  language: "Spanish",
  lemma: "hablar",
  partOfSpeech: "verb",
  definitions: [{ definition: "to speak, to talk" }],
  examples: [{ sentence: "Ella habla tres idiomas." }],
  ipa: "aˈβlaɾ"
});

// Save to user profile
const storage = getCardStorage();
await storage.saveCard("user-123", card);

Manual Testing Needed:

• Test POST /api/cards with sample data
• Test GET /api/cards retrieval
• Test PUT /api/cards/:id update with versioning
• Test DELETE /api/cards/:id removal
• Verify in-memory storage persists across requests (within session)