Document QA Web App Implementation Guide

doc-qa/
├── src/
│   ├── app/
│   │   ├── api/           # API routes using App Router
│   │   │   └── upload/
│   │   │       └── route.ts
│   │   ├── layout.tsx
│   │   └── page.tsx
│   ├── components/
│   │   ├── ui/           # shadcn components
│   │   ├── chat/         # chat-related components
│   │   │   ├── chat-interface.tsx
│   │   │   └── message-list.tsx
│   │   └── doc/          # document-related components
│   │       ├── document-viewer.tsx
│   │       └── file-upload.tsx
│   ├── lib/              # utility functions
│   │   ├── utils.ts
│   │   ├── api-client.ts
│   │   └── doc-parser.ts
│   └── types/            # type definitions
│       └── index.d.ts
├── public/
└── // ...config files

1. Project Setup

npx create-next-app@latest doc-qa --typescript --tailwind --eslint
cd doc-qa
npx shadcn-ui@latest init

2. Install Dependencies

npm install @google/generative-ai react-pdf @microsoft/fast-react-wrapper uuid
npm install -D @types/uuid

3. Environment Setup

Create .env.local:

GOOGLE_API_KEY=your_gemini_api_key

4. Core Features Implementation

A. Document Processing

1. Create document upload endpoint
2. Implement parsers for different file types
3. Store processed documents in filesystem/cloud
4. Generate embeddings using Gemini API

B. Chat Implementation

1. Set up Gemini API client
2. Create chat context management
3. Implement streaming responses
4. Store chat history

C. UI Components

1. Install required shadcn components:

npx shadcn-ui@latest add button input textarea toast dialog sheet scroll-area separator

2. Create component hierarchy:
   • Document viewer
   • Chat interface
   • File upload
   • Navigation

5. Implementation Order

Phase 1: Base Setup

1. Configure API routes
2. Set up document storage
3. Implement basic UI layout

Phase 2: Document Processing

1. Create upload mechanism
2. Implement document parsers
3. Set up document viewer

Phase 3: Chat Interface

1. Implement Gemini integration
2. Create chat UI components
3. Add streaming support

Phase 4: Polish

1. Add error handling
2. Implement loading states
3. Add responsiveness
4. Add dark mode support

6. Testing

Unit Tests

• Document processing
• Chat functionality
• UI components

Integration Tests

• File upload flow
• Chat completion flow
• Document viewing

7. Deployment

1. Configure production environment
2. Set up cloud storage
3. Deploy to Vercel/similar platform

8. Security Considerations

• Implement rate limiting
• Add file type validation
• Set up authentication if needed
• Configure CORS policies

9. Performance Optimization

• Implement caching
• Add pagination for chat history
• Optimize document processing
• Configure proper chunking for large documents