Implement AI chat history system with enhanced memory (Phases 1 & 2)

Phase 1 - Database Schema & Basic API:
- Add ChatConversation and ChatMessage tables with proper relationships
- Create conversation CRUD API endpoints with authentication
- Update chat API to support persistent conversations
- Implement auto-generated conversation titles and language separation
- Add conversation soft delete and user-specific access control

Phase 2 - Enhanced Memory System:
- Implement intelligent context selection beyond simple chronological order
- Add relevance scoring for older messages based on keyword overlap and biblical references
- Create automatic message summarization for very long conversations
- Optimize token usage with smart context management (1500 token budget)
- Add biblical awareness with Romanian/English book name detection
- Implement time-based relevance decay for better context prioritization

Frontend Improvements:
- Add chat history button to floating chat header
- Create basic history panel UI with placeholder content
- Maintain backward compatibility for anonymous users

Database Changes:
- Enhanced schema with conversation relationships and message roles
- Proper indexing for performance and user-specific queries
- Migration completed successfully with prisma db push

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

app/api/chat/conversations/[id]/route.ts

@@ -0,0 +1,266 @@
+import { NextRequest, NextResponse } from 'next/server'
+import { z } from 'zod'
+import { PrismaClient } from '@prisma/client'
+import { verifyToken } from '@/lib/auth'
+
+const prisma = new PrismaClient()
+
+export const runtime = 'nodejs'
+
+const updateConversationSchema = z.object({
+  title: z.string().min(1).max(200).optional(),
+  isActive: z.boolean().optional(),
+})
+
+// GET /api/chat/conversations/[id] - Get conversation with messages
+export async function GET(
+  request: NextRequest,
+  { params }: { params: { id: string } }
+) {
+  try {
+    // Get user from authentication
+    const authHeader = request.headers.get('authorization')
+    if (!authHeader?.startsWith('Bearer ')) {
+      return NextResponse.json(
+        { success: false, error: 'Authentication required' },
+        { status: 401 }
+      )
+    }
+
+    const token = authHeader.substring(7)
+    const payload = verifyToken(token)
+
+    if (!payload) {
+      return NextResponse.json(
+        { success: false, error: 'Invalid token' },
+        { status: 401 }
+      )
+    }
+
+    const userId = payload.userId as string
+    const conversationId = params.id
+
+    // Get conversation with messages
+    const conversation = await prisma.chatConversation.findUnique({
+      where: {
+        id: conversationId,
+        userId, // Ensure user owns this conversation
+        isActive: true
+      },
+      include: {
+        messages: {
+          orderBy: { timestamp: 'asc' },
+          select: {
+            id: true,
+            role: true,
+            content: true,
+            timestamp: true,
+            metadata: true
+          }
+        }
+      }
+    })
+
+    if (!conversation) {
+      return NextResponse.json(
+        { success: false, error: 'Conversation not found' },
+        { status: 404 }
+      )
+    }
+
+    return NextResponse.json({
+      success: true,
+      conversation: {
+        id: conversation.id,
+        title: conversation.title,
+        language: conversation.language,
+        createdAt: conversation.createdAt,
+        lastMessageAt: conversation.lastMessageAt,
+        messages: conversation.messages.map(msg => ({
+          id: msg.id,
+          role: msg.role.toLowerCase(), // Convert enum to lowercase for frontend compatibility
+          content: msg.content,
+          timestamp: msg.timestamp,
+          metadata: msg.metadata
+        }))
+      }
+    })
+
+  } catch (error) {
+    console.error('Error fetching conversation:', error)
+    return NextResponse.json(
+      {
+        success: false,
+        error: 'Failed to fetch conversation'
+      },
+      { status: 500 }
+    )
+  }
+}
+
+// PUT /api/chat/conversations/[id] - Update conversation
+export async function PUT(
+  request: NextRequest,
+  { params }: { params: { id: string } }
+) {
+  try {
+    // Get user from authentication
+    const authHeader = request.headers.get('authorization')
+    if (!authHeader?.startsWith('Bearer ')) {
+      return NextResponse.json(
+        { success: false, error: 'Authentication required' },
+        { status: 401 }
+      )
+    }
+
+    const token = authHeader.substring(7)
+    const payload = verifyToken(token)
+
+    if (!payload) {
+      return NextResponse.json(
+        { success: false, error: 'Invalid token' },
+        { status: 401 }
+      )
+    }
+
+    const userId = payload.userId as string
+    const conversationId = params.id
+
+    // Parse request body
+    const body = await request.json()
+    const updateData = updateConversationSchema.parse(body)
+
+    // Verify conversation ownership
+    const existingConversation = await prisma.chatConversation.findUnique({
+      where: {
+        id: conversationId,
+        userId
+      }
+    })
+
+    if (!existingConversation) {
+      return NextResponse.json(
+        { success: false, error: 'Conversation not found' },
+        { status: 404 }
+      )
+    }
+
+    // Update conversation
+    const conversation = await prisma.chatConversation.update({
+      where: { id: conversationId },
+      data: {
+        ...updateData,
+        updatedAt: new Date()
+      },
+      include: {
+        _count: {
+          select: { messages: true }
+        }
+      }
+    })
+
+    return NextResponse.json({
+      success: true,
+      conversation: {
+        id: conversation.id,
+        title: conversation.title,
+        language: conversation.language,
+        messageCount: conversation._count.messages,
+        lastMessageAt: conversation.lastMessageAt,
+        createdAt: conversation.createdAt,
+        isActive: conversation.isActive
+      }
+    })
+
+  } catch (error) {
+    console.error('Error updating conversation:', error)
+
+    if (error instanceof z.ZodError) {
+      return NextResponse.json(
+        {
+          success: false,
+          error: 'Invalid request format',
+          details: error.errors
+        },
+        { status: 400 }
+      )
+    }
+
+    return NextResponse.json(
+      {
+        success: false,
+        error: 'Failed to update conversation'
+      },
+      { status: 500 }
+    )
+  }
+}
+
+// DELETE /api/chat/conversations/[id] - Delete conversation
+export async function DELETE(
+  request: NextRequest,
+  { params }: { params: { id: string } }
+) {
+  try {
+    // Get user from authentication
+    const authHeader = request.headers.get('authorization')
+    if (!authHeader?.startsWith('Bearer ')) {
+      return NextResponse.json(
+        { success: false, error: 'Authentication required' },
+        { status: 401 }
+      )
+    }
+
+    const token = authHeader.substring(7)
+    const payload = verifyToken(token)
+
+    if (!payload) {
+      return NextResponse.json(
+        { success: false, error: 'Invalid token' },
+        { status: 401 }
+      )
+    }
+
+    const userId = payload.userId as string
+    const conversationId = params.id
+
+    // Verify conversation ownership
+    const existingConversation = await prisma.chatConversation.findUnique({
+      where: {
+        id: conversationId,
+        userId
+      }
+    })
+
+    if (!existingConversation) {
+      return NextResponse.json(
+        { success: false, error: 'Conversation not found' },
+        { status: 404 }
+      )
+    }
+
+    // Soft delete (mark as inactive) instead of hard delete to preserve data
+    await prisma.chatConversation.update({
+      where: { id: conversationId },
+      data: {
+        isActive: false,
+        updatedAt: new Date()
+      }
+    })
+
+    return NextResponse.json({
+      success: true,
+      message: 'Conversation deleted successfully'
+    })
+
+  } catch (error) {
+    console.error('Error deleting conversation:', error)
+    return NextResponse.json(
+      {
+        success: false,
+        error: 'Failed to delete conversation'
+      },
+      { status: 500 }
+    )
+  }
+}

app/api/chat/conversations/route.ts

@@ -0,0 +1,206 @@
+import { NextRequest, NextResponse } from 'next/server'
+import { z } from 'zod'
+import { PrismaClient } from '@prisma/client'
+import { verifyToken } from '@/lib/auth'
+
+const prisma = new PrismaClient()
+
+export const runtime = 'nodejs'
+
+const createConversationSchema = z.object({
+  title: z.string().min(1).max(200),
+  language: z.enum(['ro', 'en']).default('ro'),
+})
+
+const getConversationsSchema = z.object({
+  language: z.enum(['ro', 'en']).optional(),
+  limit: z.string().transform(Number).pipe(z.number().min(1).max(50)).optional().default(20),
+  offset: z.string().transform(Number).pipe(z.number().min(0)).optional().default(0),
+})
+
+// GET /api/chat/conversations - List user's conversations
+export async function GET(request: NextRequest) {
+  try {
+    // Get user from authentication
+    const authHeader = request.headers.get('authorization')
+    if (!authHeader?.startsWith('Bearer ')) {
+      return NextResponse.json(
+        { success: false, error: 'Authentication required' },
+        { status: 401 }
+      )
+    }
+
+    const token = authHeader.substring(7)
+    const payload = verifyToken(token)
+
+    if (!payload) {
+      return NextResponse.json(
+        { success: false, error: 'Invalid token' },
+        { status: 401 }
+      )
+    }
+
+    const userId = payload.userId as string
+
+    // Parse query parameters
+    const url = new URL(request.url)
+    const queryParams = Object.fromEntries(url.searchParams.entries())
+    const { language, limit, offset } = getConversationsSchema.parse(queryParams)
+
+    // Build where clause
+    const where: any = {
+      userId,
+      isActive: true
+    }
+
+    if (language) {
+      where.language = language
+    }
+
+    // Get conversations with message count
+    const conversations = await prisma.chatConversation.findMany({
+      where,
+      orderBy: { lastMessageAt: 'desc' },
+      take: limit,
+      skip: offset,
+      include: {
+        _count: {
+          select: { messages: true }
+        },
+        messages: {
+          take: 1,
+          orderBy: { timestamp: 'desc' },
+          select: {
+            content: true,
+            role: true,
+            timestamp: true
+          }
+        }
+      }
+    })
+
+    // Get total count for pagination
+    const total = await prisma.chatConversation.count({ where })
+
+    return NextResponse.json({
+      success: true,
+      conversations: conversations.map(conv => ({
+        id: conv.id,
+        title: conv.title,
+        language: conv.language,
+        messageCount: conv._count.messages,
+        lastMessage: conv.messages[0] || null,
+        lastMessageAt: conv.lastMessageAt,
+        createdAt: conv.createdAt
+      })),
+      pagination: {
+        total,
+        limit,
+        offset,
+        hasMore: offset + limit < total
+      }
+    })
+
+  } catch (error) {
+    console.error('Error fetching conversations:', error)
+
+    if (error instanceof z.ZodError) {
+      return NextResponse.json(
+        {
+          success: false,
+          error: 'Invalid request parameters',
+          details: error.errors
+        },
+        { status: 400 }
+      )
+    }
+
+    return NextResponse.json(
+      {
+        success: false,
+        error: 'Failed to fetch conversations'
+      },
+      { status: 500 }
+    )
+  }
+}
+
+// POST /api/chat/conversations - Create new conversation
+export async function POST(request: NextRequest) {
+  try {
+    // Get user from authentication
+    const authHeader = request.headers.get('authorization')
+    if (!authHeader?.startsWith('Bearer ')) {
+      return NextResponse.json(
+        { success: false, error: 'Authentication required' },
+        { status: 401 }
+      )
+    }
+
+    const token = authHeader.substring(7)
+    const payload = verifyToken(token)
+
+    if (!payload) {
+      return NextResponse.json(
+        { success: false, error: 'Invalid token' },
+        { status: 401 }
+      )
+    }
+
+    const userId = payload.userId as string
+
+    // Parse request body
+    const body = await request.json()
+    const { title, language } = createConversationSchema.parse(body)
+
+    // Create new conversation
+    const conversation = await prisma.chatConversation.create({
+      data: {
+        userId,
+        title,
+        language,
+        lastMessageAt: new Date()
+      },
+      include: {
+        _count: {
+          select: { messages: true }
+        }
+      }
+    })
+
+    return NextResponse.json({
+      success: true,
+      conversation: {
+        id: conversation.id,
+        title: conversation.title,
+        language: conversation.language,
+        messageCount: conversation._count.messages,
+        lastMessage: null,
+        lastMessageAt: conversation.lastMessageAt,
+        createdAt: conversation.createdAt
+      }
+    }, { status: 201 })
+
+  } catch (error) {
+    console.error('Error creating conversation:', error)
+
+    if (error instanceof z.ZodError) {
+      return NextResponse.json(
+        {
+          success: false,
+          error: 'Invalid request format',
+          details: error.errors
+        },
+        { status: 400 }
+      )
+    }
+
+    return NextResponse.json(
+      {
+        success: false,
+        error: 'Failed to create conversation'
+      },
+      { status: 500 }
+    )
+  }
+}

app/api/chat/route.ts

@@ -1,12 +1,18 @@
 import { NextRequest, NextResponse } from 'next/server'
 import { z } from 'zod'
+import { PrismaClient, ChatMessageRole } from '@prisma/client'
 import { searchBibleHybrid, BibleVerse } from '@/lib/vector-search'
+import { verifyToken } from '@/lib/auth'
+
+const prisma = new PrismaClient()
 
 export const runtime = 'nodejs'
 
 const chatRequestSchema = z.object({
   message: z.string().min(1),
+  conversationId: z.string().optional(),
   locale: z.string().optional().default('ro'),
+  // Keep history for backward compatibility with frontend
   history: z.array(z.object({
     id: z.string(),
     role: z.enum(['user', 'assistant']),
@@ -18,15 +24,115 @@ const chatRequestSchema = z.object({
 export async function POST(request: NextRequest) {
   try {
     const body = await request.json()
-    const { message, locale, history } = chatRequestSchema.parse(body)
+    const { message, conversationId, locale, history } = chatRequestSchema.parse(body)
 
-    // Generate response using Azure OpenAI with vector search
+    // Try to get user from authentication (optional for backward compatibility)
-    const response = await generateBiblicalResponse(message, locale, history)
+    let userId: string | null = null
+    const authHeader = request.headers.get('authorization')
+    if (authHeader?.startsWith('Bearer ')) {
+      try {
+        const token = authHeader.substring(7)
+        const payload = verifyToken(token)
+        userId = payload.userId
+      } catch (error) {
+        // Continue without authentication for backward compatibility
+        console.log('Chat without authentication')
+      }
+    }
+
+    // Handle conversation logic
+    let finalConversationId = conversationId
+    let conversationHistory: any[] = []
+
+    if (userId) {
+      // User is authenticated - use conversation system
+      if (conversationId) {
+        // Load existing conversation
+        const conversation = await prisma.chatConversation.findUnique({
+          where: {
+            id: conversationId,
+            userId,
+            isActive: true
+          },
+          include: {
+            messages: {
+              orderBy: { timestamp: 'desc' },
+              take: 15, // Last 15 messages for context
+              select: {
+                role: true,
+                content: true,
+                timestamp: true
+              }
+            }
+          }
+        })
+
+        if (conversation) {
+          conversationHistory = conversation.messages
+            .reverse() // Oldest first for context
+            .map(msg => ({
+              role: msg.role.toLowerCase(),
+              content: msg.content,
+              timestamp: msg.timestamp.toISOString()
+            }))
+        }
+      } else {
+        // Create new conversation
+        const conversation = await prisma.chatConversation.create({
+          data: {
+            userId,
+            title: generateConversationTitle(message),
+            language: locale,
+            lastMessageAt: new Date()
+          }
+        })
+        finalConversationId = conversation.id
+      }
+    } else {
+      // Anonymous user - use provided history for backward compatibility
+      conversationHistory = history
+    }
+
+    // Generate AI response
+    const aiResponse = await generateBiblicalResponse(message, locale, conversationHistory)
+
+    // Save messages to database if user is authenticated
+    if (userId && finalConversationId) {
+      await prisma.$transaction([
+        // Save user message
+        prisma.chatMessage.create({
+          data: {
+            conversationId: finalConversationId,
+            userId,
+            role: ChatMessageRole.USER,
+            content: message,
+            timestamp: new Date()
+          }
+        }),
+        // Save AI response
+        prisma.chatMessage.create({
+          data: {
+            conversationId: finalConversationId,
+            userId,
+            role: ChatMessageRole.ASSISTANT,
+            content: aiResponse,
+            timestamp: new Date()
+          }
+        }),
+        // Update conversation last message time
+        prisma.chatConversation.update({
+          where: { id: finalConversationId },
+          data: { lastMessageAt: new Date() }
+        })
+      ])
+    }
 
     return NextResponse.json({
       success: true,
-      response
+      response: aiResponse,
+      conversationId: finalConversationId
     })
+
   } catch (error) {
     console.error('Error in chat API:', error)
 
@@ -61,11 +167,8 @@ async function generateBiblicalResponse(message: string, locale: string, history
       .map(verse => `${verse.ref}: "${verse.text_raw}"`)
       .join('\n\n')
 
-    // Create conversation history for context
+    // Intelligent context selection for conversation history
-    const conversationHistory = history
+    const conversationHistory = buildSmartContext(history, message, locale)
-      .slice(-3) // Last 3 messages for context
-      .map(msg => `${msg.role}: ${msg.content}`)
-      .join('\n')
 
     // Create language-specific system prompts
     const systemPrompts = {
@@ -126,7 +229,7 @@ Current question: ${message}`
               content: message
             }
           ],
-          max_tokens: 800,
+          max_tokens: 2000,
           temperature: 0.7,
           top_p: 0.9
         }),
@@ -161,3 +264,148 @@ Current question: ${message}`
     return fallbackResponses[locale as keyof typeof fallbackResponses] || fallbackResponses.en
   }
 }
+
+function generateConversationTitle(message: string): string {
+  // Generate a title from the first message (max 50 characters)
+  const title = message.length > 47
+    ? message.substring(0, 47) + '...'
+    : message
+
+  return title
+}
+
+function buildSmartContext(history: any[], currentMessage: string, locale: string): string {
+  if (history.length === 0) return ''
+
+  const MAX_CONTEXT_TOKENS = 1500 // Reserve tokens for context
+  const RECENT_MESSAGES_COUNT = 6 // Always include last 6 messages
+
+  // Step 1: Always include the most recent messages for immediate context
+  const recentMessages = history.slice(-RECENT_MESSAGES_COUNT)
+
+  // Step 2: Calculate relevance scores for older messages
+  const olderMessages = history.slice(0, -RECENT_MESSAGES_COUNT)
+  const relevantOlderMessages = findRelevantMessages(olderMessages, currentMessage, locale)
+
+  // Step 3: Combine recent + relevant older messages
+  const selectedMessages = [...relevantOlderMessages, ...recentMessages]
+
+  // Step 4: Apply token-based truncation if needed
+  const optimizedContext = optimizeContextForTokens(selectedMessages, MAX_CONTEXT_TOKENS)
+
+  // Step 5: Format for AI consumption
+  return formatContextForAI(optimizedContext)
+}
+
+function findRelevantMessages(messages: any[], currentMessage: string, locale: string): any[] {
+  if (messages.length === 0) return []
+
+  // Score messages based on relevance to current question
+  const scoredMessages = messages.map(msg => ({
+    ...msg,
+    relevanceScore: calculateMessageRelevance(msg, currentMessage, locale)
+  }))
+
+  // Sort by relevance and take top 3-5 most relevant older messages
+  return scoredMessages
+    .filter(msg => msg.relevanceScore > 0.3) // Only include somewhat relevant messages
+    .sort((a, b) => b.relevanceScore - a.relevanceScore)
+    .slice(0, 5) // Max 5 relevant older messages
+}
+
+function calculateMessageRelevance(message: any, currentMessage: string, locale: string): number {
+  const msgContent = message.content.toLowerCase()
+  const currentContent = currentMessage.toLowerCase()
+
+  let score = 0
+
+  // Keyword overlap scoring
+  const currentWords = currentContent.split(/\s+/).filter(word => word.length > 3)
+  const messageWords = msgContent.split(/\s+/)
+
+  for (const word of currentWords) {
+    if (messageWords.some(mWord => mWord.includes(word) || word.includes(mWord))) {
+      score += 0.2
+    }
+  }
+
+  // Biblical reference detection (higher relevance)
+  const biblicalPatterns = locale === 'ro'
+    ? [/\b(geneza|exod|levitic|numeri|deuteronom|iosua|judecători|rut|samuel|regi|cronici|ezra|neemia|estera|iov|psalmi|proverbe|ecclesiast|cântarea|isaia|ieremia|plângeri|ezechiel|daniel|osea|ioel|amos|obadia|iona|mica|naum|habacuc|țefania|hagai|zaharia|maleahi|matei|marcu|luca|ioan|faptele|romani|corinteni|galateni|efeseni|filipeni|coloseni|tesaloniceni|timotei|tit|filimon|evrei|iacov|petru|ioan|iuda|apocalipsa)\s*\d+/gi]
+    : [/\b(genesis|exodus|leviticus|numbers|deuteronomy|joshua|judges|ruth|samuel|kings|chronicles|ezra|nehemiah|esther|job|psalm|proverbs|ecclesiastes|song|isaiah|jeremiah|lamentations|ezekiel|daniel|hosea|joel|amos|obadiah|jonah|micah|nahum|habakkuk|zephaniah|haggai|zechariah|malachi|matthew|mark|luke|john|acts|romans|corinthians|galatians|ephesians|philippians|colossians|thessalonians|timothy|titus|philemon|hebrews|james|peter|jude|revelation)\s*\d+/gi]
+
+  if (biblicalPatterns.some(pattern => pattern.test(msgContent))) {
+    score += 0.4
+  }
+
+  // Recent user questions get higher relevance
+  if (message.role === 'user') {
+    score += 0.1
+  }
+
+  // Time decay (older messages get slightly lower scores)
+  const messageAge = Date.now() - new Date(message.timestamp).getTime()
+  const hoursAge = messageAge / (1000 * 60 * 60)
+  const timeDecay = Math.max(0.5, 1 - (hoursAge / 168)) // Decay over a week
+
+  return Math.min(1.0, score * timeDecay)
+}
+
+function optimizeContextForTokens(messages: any[], maxTokens: number): any[] {
+  // Rough token estimation (1 token ≈ 4 characters in English, 3 in Romanian)
+  let currentTokens = 0
+  const optimizedMessages = []
+
+  // Start from most recent and work backwards
+  for (let i = messages.length - 1; i >= 0; i--) {
+    const message = messages[i]
+    const estimatedTokens = Math.ceil(message.content.length / 3.5)
+
+    if (currentTokens + estimatedTokens <= maxTokens) {
+      optimizedMessages.unshift(message) // Add to beginning to maintain order
+      currentTokens += estimatedTokens
+    } else {
+      // If this message would exceed limit, try to include a summary instead
+      if (i > 0 && optimizedMessages.length < 3) {
+        const summary = summarizeMessage(message)
+        const summaryTokens = Math.ceil(summary.length / 3.5)
+        if (currentTokens + summaryTokens <= maxTokens) {
+          optimizedMessages.unshift({
+            ...message,
+            content: summary,
+            isSummary: true
+          })
+          currentTokens += summaryTokens
+        }
+      }
+      break
+    }
+  }
+
+  return optimizedMessages
+}
+
+function summarizeMessage(message: any): string {
+  const content = message.content
+  if (content.length <= 100) return content
+
+  // Extract key points and questions
+  const sentences = content.split(/[.!?]+/).filter(s => s.trim().length > 10)
+  if (sentences.length <= 2) return content
+
+  // Keep first and last sentence, or most important parts
+  const summary = sentences.length > 3
+    ? `${sentences[0].trim()}... ${sentences[sentences.length - 1].trim()}`
+    : sentences.slice(0, 2).join('. ').trim()
+
+  return `[Summary] ${summary}`
+}
+
+function formatContextForAI(messages: any[]): string {
+  if (messages.length === 0) return ''
+
+  return messages.map(msg => {
+    const prefix = msg.isSummary ? '[Summary] ' : ''
+    return `${prefix}${msg.role}: ${msg.content}`
+  }).join('\n')
+}

components/chat/floating-chat.tsx

@@ -30,9 +30,11 @@ import {
   ThumbDown,
   Minimize,
   Launch,
+  History,
 } from '@mui/icons-material'
 import { useState, useRef, useEffect } from 'react'
 import { useTranslations, useLocale } from 'next-intl'
+import ReactMarkdown from 'react-markdown'
 
 interface ChatMessage {
   id: string
@@ -48,6 +50,7 @@ export default function FloatingChat() {
   const [isOpen, setIsOpen] = useState(false)
   const [isMinimized, setIsMinimized] = useState(false)
   const [isFullscreen, setIsFullscreen] = useState(false)
+  const [showHistory, setShowHistory] = useState(false)
   const [messages, setMessages] = useState<ChatMessage[]>([
     {
       id: '1',
@@ -240,6 +243,14 @@ export default function FloatingChat() {
               </Box>
             </Box>
             <Box>
+              <IconButton
+                size="small"
+                onClick={() => setShowHistory(!showHistory)}
+                sx={{ color: 'white', mr: 0.5 }}
+                title="Chat History"
+              >
+                <History />
+              </IconButton>
               <IconButton
                 size="small"
                 onClick={minimizeChat}
@@ -265,6 +276,39 @@ export default function FloatingChat() {
           </Box>
 
           {!isMinimized && (
+            <>
+              {/* Chat History Panel */}
+              {showHistory && (
+                <Box sx={{
+                  p: 2,
+                  borderBottom: 1,
+                  borderColor: 'divider',
+                  bgcolor: 'grey.50',
+                  maxHeight: '300px',
+                  overflowY: 'auto'
+                }}>
+                  <Typography variant="h6" sx={{ mb: 2 }}>
+                    Chat History
+                  </Typography>
+                  <Box sx={{ display: 'flex', flexDirection: 'column', gap: 1 }}>
+                    <Typography variant="body2" color="text.secondary" textAlign="center" sx={{ py: 2 }}>
+                      📝 Chat history will appear here
+                    </Typography>
+                    <Typography variant="body2" color="text.secondary" textAlign="center">
+                      ✨ Sign in to save your conversations
+                    </Typography>
+                    <Button
+                      variant="outlined"
+                      size="small"
+                      sx={{ mt: 1 }}
+                      onClick={() => setShowHistory(false)}
+                    >
+                      Close History
+                    </Button>
+                  </Box>
+                </Box>
+              )}
+
             <>
               {/* Suggested Questions */}
               <Box sx={{ p: 2, borderBottom: 1, borderColor: 'divider' }}>
@@ -338,6 +382,52 @@ export default function FloatingChat() {
                           maxWidth: '100%',
                         }}
                       >
+                        {message.role === 'assistant' ? (
+                          <ReactMarkdown
+                            components={{
+                              p: ({ children }) => (
+                                <Typography
+                                  variant="body2"
+                                  sx={{ mb: 1, lineHeight: 1.4 }}
+                                >
+                                  {children}
+                                </Typography>
+                              ),
+                              h3: ({ children }) => (
+                                <Typography
+                                  variant="h6"
+                                  sx={{ fontWeight: 'bold', mt: 2, mb: 1 }}
+                                >
+                                  {children}
+                                </Typography>
+                              ),
+                              strong: ({ children }) => (
+                                <Typography
+                                  component="span"
+                                  sx={{ fontWeight: 'bold' }}
+                                >
+                                  {children}
+                                </Typography>
+                              ),
+                              ul: ({ children }) => (
+                                <Box component="ul" sx={{ pl: 2, mb: 1 }}>
+                                  {children}
+                                </Box>
+                              ),
+                              li: ({ children }) => (
+                                <Typography
+                                  component="li"
+                                  variant="body2"
+                                  sx={{ mb: 0.5 }}
+                                >
+                                  {children}
+                                </Typography>
+                              ),
+                            }}
+                          >
+                            {message.content}
+                          </ReactMarkdown>
+                        ) : (
                           <Typography
                             variant="body2"
                             sx={{
@@ -347,6 +437,7 @@ export default function FloatingChat() {
                           >
                             {message.content}
                           </Typography>
+                        )}
 
                         {message.role === 'assistant' && (
                           <Box sx={{ display: 'flex', gap: 0.5, mt: 1, justifyContent: 'flex-end' }}>

prisma/schema.prisma

@@ -24,6 +24,7 @@ model User {
   chapterBookmarks ChapterBookmark[]
   notes           Note[]
   chatMessages    ChatMessage[]
+  chatConversations ChatConversation[]
   prayerRequests  PrayerRequest[]
   userPrayers     UserPrayer[]
   readingHistory  ReadingHistory[]
@@ -126,17 +127,43 @@ model BiblePassage {
   @@index([testament])
 }
 
+model ChatConversation {
+  id            String   @id @default(uuid())
+  userId        String?  // Optional for anonymous users
+  title         String   // Auto-generated from first message
+  language      String   // 'ro' or 'en'
+  isActive      Boolean  @default(true)
+  createdAt     DateTime @default(now())
+  updatedAt     DateTime @updatedAt
+  lastMessageAt DateTime @default(now())
+
+  user          User?    @relation(fields: [userId], references: [id], onDelete: Cascade)
+  messages      ChatMessage[]
+
+  @@index([userId, language, lastMessageAt])
+  @@index([isActive, lastMessageAt])
+}
+
 model ChatMessage {
   id             String           @id @default(uuid())
-  userId      String
+  conversationId String
-  role        String   // 'user' or 'assistant'
+  userId         String?          // Keep for backward compatibility
+  role           ChatMessageRole
   content        String           @db.Text
   metadata       Json?            // Store verse references, etc.
-  createdAt   DateTime @default(now())
+  timestamp      DateTime         @default(now())
 
-  user        User     @relation(fields: [userId], references: [id], onDelete: Cascade)
+  conversation   ChatConversation @relation(fields: [conversationId], references: [id], onDelete: Cascade)
+  user           User?            @relation(fields: [userId], references: [id], onDelete: Cascade)
 
-  @@index([userId, createdAt])
+  @@index([conversationId, timestamp])
+  @@index([userId, timestamp])
+}
+
+enum ChatMessageRole {
+  USER
+  ASSISTANT
+  SYSTEM
 }
 
 model Bookmark {

temp/ai-chat-improvements-plan.md

@@ -0,0 +1,364 @@
+# AI Chat Improvements Plan
+
+## Overview
+Enhance the AI chat system with persistent chat history and conversation memory to provide a more engaging and contextual user experience.
+
+## Current State Analysis
+- ✅ Basic AI chat with Azure OpenAI integration
+- ✅ ReactMarkdown rendering for formatted responses
+- ✅ Floating chat component with fullscreen mode
+- ✅ Language-specific responses (Romanian/English)
+- ❌ No chat persistence between sessions
+- ❌ Limited conversation memory (only last 3 messages)
+- ❌ No user-specific chat history
+- ❌ No chat management UI
+
+## Goals
+1. **Persistent Chat History**: Store chat conversations in database per user and language
+2. **Enhanced Memory**: Maintain longer conversation context for better AI responses
+3. **Chat Management**: Allow users to view, organize, and manage their chat history
+4. **Multi-language Support**: Separate chat histories for Romanian and English
+
+## Technical Implementation Plan
+
+### 1. Database Schema Extensions
+
+#### 1.1 Chat Conversations Table
+```prisma
+model ChatConversation {
+  id          String   @id @default(cuid())
+  userId      String?  // Optional for anonymous users
+  title       String   // Auto-generated from first message
+  language    String   // 'ro' or 'en'
+  isActive    Boolean  @default(true)
+  createdAt   DateTime @default(now())
+  updatedAt   DateTime @updatedAt
+  lastMessageAt DateTime @default(now())
+
+  user        User?    @relation(fields: [userId], references: [id], onDelete: Cascade)
+  messages    ChatMessage[]
+
+  @@index([userId, language, lastMessageAt])
+  @@index([isActive, lastMessageAt])
+}
+
+model ChatMessage {
+  id             String           @id @default(cuid())
+  conversationId String
+  role           ChatMessageRole
+  content        String           @db.Text
+  timestamp      DateTime         @default(now())
+  metadata       Json?            // For storing additional context
+
+  conversation   ChatConversation @relation(fields: [conversationId], references: [id], onDelete: Cascade)
+
+  @@index([conversationId, timestamp])
+}
+
+enum ChatMessageRole {
+  USER
+  ASSISTANT
+  SYSTEM
+}
+```
+
+#### 1.2 Update User Model
+```prisma
+model User {
+  // ... existing fields
+  chatConversations ChatConversation[]
+}
+```
+
+### 2. API Endpoints
+
+#### 2.1 Chat Conversations API (`/api/chat/conversations`)
+- **GET**: List user's conversations (paginated, filtered by language)
+- **POST**: Create new conversation
+- **DELETE /:id**: Delete conversation
+
+#### 2.2 Enhanced Chat API (`/api/chat`)
+- **Modify existing POST**: Include conversation management
+- **GET /:conversationId**: Get conversation history
+- **PUT /:conversationId**: Update conversation (rename, etc.)
+
+#### 2.3 Chat Messages API (`/api/chat/:conversationId/messages`)
+- **GET**: Get all messages in conversation (paginated)
+- **POST**: Add message to conversation
+
+### 3. Frontend Components
+
+#### 3.1 Enhanced Floating Chat Component
+```typescript
+interface FloatingChatProps {
+  conversationId?: string
+  initialMessage?: string
+}
+
+// New state management
+const [conversations, setConversations] = useState<Conversation[]>([])
+const [activeConversationId, setActiveConversationId] = useState<string | null>(null)
+const [messages, setMessages] = useState<ChatMessage[]>([])
+const [isHistoryOpen, setIsHistoryOpen] = useState(false)
+```
+
+#### 3.2 Chat History Sidebar
+```typescript
+interface ChatHistorySidebarProps {
+  conversations: Conversation[]
+  activeConversationId: string | null
+  onSelectConversation: (id: string) => void
+  onNewConversation: () => void
+  onDeleteConversation: (id: string) => void
+  language: string
+}
+```
+
+#### 3.3 Conversation List Item
+```typescript
+interface ConversationListItemProps {
+  conversation: Conversation
+  isActive: boolean
+  onClick: () => void
+  onDelete: () => void
+  onRename: (newTitle: string) => void
+}
+```
+
+### 4. Implementation Phases
+
+#### Phase 1: Database Schema & Basic API
+1. **Create Prisma migrations** for new tables
+2. **Implement conversation CRUD APIs**
+3. **Add database seed scripts** for testing
+4. **Update existing chat API** to work with conversations
+
+#### Phase 2: Enhanced Memory System
+1. **Modify chat API** to include more conversation context
+2. **Implement intelligent context selection** (last 10-15 messages)
+3. **Add conversation summarization** for very long chats
+4. **Optimize token usage** with smart context management
+
+#### Phase 3: Frontend Chat Management
+1. **Add conversation state management** to floating chat
+2. **Implement chat history sidebar**
+3. **Add conversation creation/deletion** functionality
+4. **Implement conversation switching** within chat
+
+#### Phase 4: Advanced Features
+1. **Auto-generate conversation titles** from first message
+2. **Add conversation search/filtering**
+3. **Implement conversation sharing** (optional)
+4. **Add conversation export** functionality
+
+### 5. Detailed Implementation Steps
+
+#### 5.1 Database Setup
+```bash
+# Create migration
+npx prisma migrate dev --name add-chat-conversations
+
+# Update database
+npx prisma db push
+
+# Generate client
+npx prisma generate
+```
+
+#### 5.2 API Implementation Strategy
+
+**Chat API Enhancement (`/api/chat/route.ts`)**:
+```typescript
+// Modified request schema
+const chatRequestSchema = z.object({
+  message: z.string().min(1),
+  conversationId: z.string().optional(),
+  locale: z.string().default('ro'),
+  userId: z.string().optional()
+})
+
+// Enhanced response
+interface ChatResponse {
+  success: boolean
+  response: string
+  conversationId: string
+  messageId: string
+}
+```
+
+**Conversation Management Logic**:
+```typescript
+async function handleChatMessage(
+  message: string,
+  conversationId?: string,
+  locale: string = 'ro',
+  userId?: string
+) {
+  // 1. Get or create conversation
+  const conversation = conversationId
+    ? await getConversation(conversationId)
+    : await createConversation(userId, locale, message)
+
+  // 2. Get conversation history (last 15 messages)
+  const history = await getConversationHistory(conversation.id, 15)
+
+  // 3. Generate AI response with full context
+  const aiResponse = await generateBiblicalResponse(message, locale, history)
+
+  // 4. Save both user message and AI response
+  await saveMessages(conversation.id, [
+    { role: 'user', content: message },
+    { role: 'assistant', content: aiResponse }
+  ])
+
+  // 5. Update conversation metadata
+  await updateConversationActivity(conversation.id)
+
+  return { response: aiResponse, conversationId: conversation.id }
+}
+```
+
+#### 5.3 Frontend State Management
+
+**Enhanced Floating Chat Hook**:
+```typescript
+function useFloatingChat() {
+  const [conversations, setConversations] = useState<Conversation[]>([])
+  const [activeConversation, setActiveConversation] = useState<Conversation | null>(null)
+  const [messages, setMessages] = useState<ChatMessage[]>([])
+  const [isLoading, setIsLoading] = useState(false)
+
+  const loadConversations = useCallback(async () => {
+    // Fetch user's conversations
+  }, [])
+
+  const switchConversation = useCallback(async (conversationId: string) => {
+    // Load conversation messages
+  }, [])
+
+  const startNewConversation = useCallback(() => {
+    // Reset state for new conversation
+  }, [])
+
+  const sendMessage = useCallback(async (message: string) => {
+    // Send message with conversation context
+  }, [activeConversation])
+
+  return {
+    conversations,
+    activeConversation,
+    messages,
+    isLoading,
+    loadConversations,
+    switchConversation,
+    startNewConversation,
+    sendMessage
+  }
+}
+```
+
+### 6. UI/UX Enhancements
+
+#### 6.1 Chat History Sidebar Layout
+```
+┌─────────────────┬──────────────────────┐
+│   Chat History  │   Active Chat        │
+│                 │                      │
+│ ○ New Chat      │ ┌─ Messages ─────┐   │
+│                 │ │                │   │
+│ ╔═ Today ═══    │ │ User: Question │   │
+│ ║ ○ Bible Q&A   │ │ AI: Response   │   │
+│ ║ ○ Prayer Help │ │ ...            │   │
+│ ╚═══════════    │ │                │   │
+│                 │ └────────────────┘   │
+│ ╔═ Yesterday ═  │ ┌─ Input ──────────┐ │
+│ ║ ○ Verse Study │ │ [Type message... ]│ │
+│ ╚═══════════    │ └──────────────────┘ │
+└─────────────────┴──────────────────────┘
+```
+
+#### 6.2 Mobile-Responsive Design
+- **Mobile**: Stack history as overlay/drawer
+- **Tablet**: Side-by-side with collapsed history
+- **Desktop**: Full side-by-side layout
+
+### 7. Performance Considerations
+
+#### 7.1 Database Optimization
+- **Indexes**: conversation lookups, message pagination
+- **Pagination**: Limit conversation and message queries
+- **Cleanup**: Archive old conversations after 6 months
+
+#### 7.2 Frontend Optimization
+- **Lazy loading**: Load conversations on demand
+- **Virtualization**: For large message lists
+- **Caching**: Cache conversation metadata
+
+#### 7.3 AI Context Management
+- **Smart truncation**: Summarize old messages if context too long
+- **Relevance scoring**: Prioritize recent and relevant messages
+- **Token optimization**: Balance context richness vs cost
+
+### 8. Security & Privacy
+
+#### 8.1 Data Protection
+- **User isolation**: Strict user-based access control
+- **Encryption**: Sensitive conversation content
+- **Retention policy**: Auto-delete after configurable period
+
+#### 8.2 Anonymous Users
+- **Session-based storage**: For non-authenticated users
+- **Migration path**: Convert anonymous chats to user accounts
+
+### 9. Testing Strategy
+
+#### 9.1 Unit Tests
+- Conversation CRUD operations
+- Message history management
+- AI context generation
+
+#### 9.2 Integration Tests
+- Full chat flow with persistence
+- Conversation switching
+- Multi-language handling
+
+#### 9.3 User Testing
+- Chat history navigation
+- Conversation management
+- Mobile responsiveness
+
+### 10. Deployment Considerations
+
+#### 10.1 Migration Strategy
+- **Backward compatibility**: Existing chat continues to work
+- **Data migration**: Convert existing session data if applicable
+- **Feature flags**: Gradual rollout of new features
+
+#### 10.2 Monitoring
+- **Conversation metrics**: Creation, length, engagement
+- **Performance monitoring**: API response times
+- **Error tracking**: Failed chat operations
+
+## Success Metrics
+
+1. **User Engagement**: Longer chat sessions, return conversations
+2. **Conversation Quality**: Better AI responses with context
+3. **User Satisfaction**: Positive feedback on chat experience
+4. **Technical Performance**: Fast conversation loading, reliable persistence
+
+## Timeline Estimate
+
+- **Phase 1** (Database & API): 3-4 days
+- **Phase 2** (Enhanced Memory): 2-3 days
+- **Phase 3** (Frontend Management): 4-5 days
+- **Phase 4** (Advanced Features): 3-4 days
+
+**Total**: ~2-3 weeks for complete implementation
+
+## Next Steps
+
+1. Review and approve this plan
+2. Begin with Phase 1: Database schema and basic API
+3. Implement incremental improvements
+4. Test thoroughly at each phase
+5. Gather user feedback and iterate