// ============================================================
// INTEGRATION GUIDE
// How to plug these improvements into your existing codebase
// ============================================================

/**
 * This file shows the EXACT changes to make in each file of your
 * existing React Native app. Each section maps to a specific file
 * in your codebase.
 */

// ──────────────────────────────────────────────────────────────
// FILE: features/memory/infrastructure/memoryVectorStore.ts
// CHANGE: Replace direct INSERT with dedup-aware store
// ──────────────────────────────────────────────────────────────

/*
BEFORE (line ~28):

  export async function storeMemory(text: string, embedding: number[]) {
    await db.run(
      'INSERT INTO memories (text, embedding) VALUES (?, vec_f32(?))',
      [text, JSON.stringify(embedding)]
    );
  }

AFTER:

  import { ImprovedMemoryService } from '../../../memory-improvements/src';

  const memoryService = new ImprovedMemoryService(db, embedFn, config);

  export async function storeMemory(text: string, embedding: number[]) {
    return memoryService.storeUserMessage(text, embedding);
  }
*/

// ──────────────────────────────────────────────────────────────
// FILE: features/memory/application/useSemanticMemory.ts
// CHANGE: Replace fixed top-5/0.45 with dynamic retrieval
// ──────────────────────────────────────────────────────────────

/*
BEFORE (line ~6):

  export function useSemanticMemory() {
    const searchMemories = async (embedding: number[]) => {
      const results = await db.getAll(
        `SELECT text FROM memories
         WHERE vec_distance_cosine(embedding, vec_f32(?)) <= ?
         ORDER BY vec_distance_cosine(embedding, vec_f32(?)) ASC
         LIMIT 5`,
        [JSON.stringify(embedding), 0.55, JSON.stringify(embedding)]
      );
      return results
        .filter(r => (1 - r.distance) >= 0.45)
        .map(r => r.text);
    };
    return { searchMemories };
  }

AFTER:

  import { ImprovedMemoryService } from '../../../memory-improvements/src';

  export function useSemanticMemory(memoryService: ImprovedMemoryService) {
    const searchMemories = async (userMessage: string, embedding: number[]) => {
      const { context, memoryIds } = await memoryService.retrieve(userMessage, embedding);
      return context;
    };
    return { searchMemories };
  }
*/

// ──────────────────────────────────────────────────────────────
// FILE: features/memory/application/memoryService.ts
// CHANGE: Replace scoreMessage with smart filtering
// ──────────────────────────────────────────────────────────────

/*
BEFORE (line ~20):

  export function scoreMessage(text: string): boolean {
    if (text.length < 10) return false;
    if (isSmallTalk(text)) return false;
    return true;
  }

AFTER:

  import { shouldStoreUserMessage } from '../../../memory-improvements/src/smartFilter';

  export function scoreMessage(text: string): { store: boolean; textToStore: string } {
    return shouldStoreUserMessage(text);
  }
*/

// ──────────────────────────────────────────────────────────────
// FILE: features/chat/application/ChatGenerationContext.tsx
// CHANGE: Add assistant memory storage after reply generation
// ──────────────────────────────────────────────────────────────

/*
BEFORE (line ~179):

  await saveMessage(conversationId, 'assistant', responseBuffer);

AFTER:

  await saveMessage(conversationId, 'assistant', responseBuffer);
  await memoryService.storeAssistantReply(responseBuffer);  // NEW
*/

// ──────────────────────────────────────────────────────────────
// FILE: features/chat/application/ChatGenerationContext.tsx
// CHANGE: Pass user message text to retrieval (not just embedding)
// ──────────────────────────────────────────────────────────────

/*
BEFORE (line ~139):

  const sharedEmbedding = embed(userText);
  const memories = await searchMemories(sharedEmbedding);

AFTER:

  const sharedEmbedding = await embed(userText);
  const { context: memories } = await memoryService.retrieve(userText, sharedEmbedding);
*/

// ──────────────────────────────────────────────────────────────
// FILE: features/chat/domain/constants.ts
// CHANGE: Use structured memory format in system prompt
// ──────────────────────────────────────────────────────────────

/*
BEFORE (line ~26):

  export function buildSystemPrompt(characterName: string, memories: string[]): string {
    const memorySection = memories.length > 0
      ? `\n\nPast context:\n${memories.map(m => `- ${m}`).join('\n')}`
      : '';
    return `Your name is ${characterName}. You are a casual AI companion texting on Messenger.${memorySection}`;
  }

AFTER:

  export function buildSystemPrompt(characterName: string, formattedMemories: string): string {
    const memorySection = formattedMemories ? `\n\n${formattedMemories}` : '';
    return `Your name is ${characterName}. You are a casual AI companion texting on Messenger.${memorySection}`;
  }

  // Output format:
  //   About the user:
  //   - Allergic to peanuts
  //   - Likes spicy noodles
  //
  //   Recent events:
  //   - Went to the dentist yesterday
  //
  //   Instructions:
  //   - Always suggest peanut-free options
*/

// ──────────────────────────────────────────────────────────────
// FILE: features/memory/MemoryProvider.tsx (NEW FILE)
// CHANGE: Initialize the improved memory service
// ──────────────────────────────────────────────────────────────

/*
  import React, { createContext, useContext, useState } from 'react';
  import { ImprovedMemoryService, DEFAULT_MEMORY_CONFIG } from '../memory-improvements/src';

  const MemoryContext = createContext<ImprovedMemoryService | null>(null);

  export function MemoryProvider({ children, db, embedFn }: {
    children: React.ReactNode;
    db: any;
    embedFn: (text: string) => Promise<number[]>;
  }) {
    const [service] = useState(() => new ImprovedMemoryService(db, embedFn, {
      ...DEFAULT_MEMORY_CONFIG,
    }));

    return (
      <MemoryContext.Provider value={service}>
        {children}
      </MemoryContext.Provider>
    );
  }

  export function useMemoryService(): ImprovedMemoryService {
    const service = useContext(MemoryContext);
    if (!service) throw new Error('useMemoryService must be used within MemoryProvider');
    return service;
  }
*/

// ──────────────────────────────────────────────────────────────
// DATABASE MIGRATION (run once on app update)
// ──────────────────────────────────────────────────────────────

/*
  async function initDatabase() {
    const db = await open({ name: 'chat.db' });
    const { user_version } = await db.get('PRAGMA user_version');

    if (user_version < 2) {
      await db.transaction(async (tx) => {
        await tx.run(`
          CREATE TABLE IF NOT EXISTS memories_v2 (
            id TEXT PRIMARY KEY,
            text TEXT NOT NULL,
            embedding BLOB NOT NULL,
            type TEXT NOT NULL DEFAULT 'semantic',
            source TEXT NOT NULL DEFAULT 'user',
            created_at INTEGER NOT NULL,
            last_accessed_at INTEGER NOT NULL,
            access_count INTEGER NOT NULL DEFAULT 0,
            importance REAL NOT NULL DEFAULT 0.5,
            conversation_id TEXT,
            metadata TEXT
          )
        `);

        const existing = await tx.getAll('SELECT * FROM memories');
        for (const row of existing) {
          await tx.run(
            `INSERT INTO memories_v2 VALUES (?, ?, ?, 'semantic', 'user', ?, ?, 0, 0.5, NULL, NULL)`,
            [`mem_${row.id}`, row.text, row.embedding, Date.now(), Date.now()]
          );
        }
        await tx.run('PRAGMA user_version = 2');
      });
    }
    return db;
  }
*/