# Changelog

All notable changes to this project will be documented in this file.

The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).

---

## [Unreleased]

### Planned Features
- [ ] CSV import/export for all tables
- [ ] Column sorting on list pages
- [ ] Multi-LLM support (Gemini, DeepSeek, OpenAI)
- [ ] PDF report generation
- [ ] Batch analysis functionality
- [ ] Email notifications
- [ ] Two-factor authentication

---

## [1.0.0] - 2025-12-05

### Added (Phase 5: 管理者功能與前端整合)
- ✅ Complete React Frontend Architecture
  - `src/services/api.js` - API client service (198 lines, 17 endpoints)
  - `src/contexts/AuthContext.jsx` - Authentication context & hooks
  - `src/components/Layout.jsx` - Responsive application layout
- ✅ Authentication & User Interface
  - `src/pages/LoginPage.jsx` - Beautiful login page with gradient design
  - Session-based authentication with cookies
  - Auto-login on page refresh
  - Role-based UI rendering (user, admin, super_admin)
  - User profile dropdown menu
- ✅ Core Analysis Features
  - `src/pages/AnalyzePage.jsx` - Complete 5 Why analysis tool (210 lines)
    - Finding + job content input form
    - 7 language support (繁中, 簡中, EN, JP, KR, VN, TH)
    - Real-time AI analysis with loading indicator
    - Results display with 3 perspectives (technical, process, human)
    - Full 5 Why chain visualization with root cause & solutions
    - Usage guidelines
  - `src/pages/HistoryPage.jsx` - Analysis history (210 lines)
    - Paginated table of user analyses
    - View detail modal with full analysis
    - Delete functionality
    - Status badges (pending, processing, completed, failed)
    - Pagination controls
- ✅ Admin Dashboard
  - `src/pages/AdminPage.jsx` - Complete admin interface (450 lines)
    - Dashboard tab: Statistics cards (users, analyses, monthly stats)
    - Users tab: User management table with create/delete
    - Analyses tab: All system analyses across all users
    - Audit tab: Security audit logs with IP tracking
    - Create user modal with role selection
    - Role-based access control
- ✅ Main Application Integration
  - `src/App.jsx` - Complete app router (48 lines)
  - AuthProvider wrapper for global auth state
  - Loading screen with spinner
  - Conditional rendering (Login page vs Main app)
  - Page navigation state management

### Added (Phase 4: 核心程式開發)
- ✅ Complete Models layer
  - `models/User.js` - User management with authentication
  - `models/Analysis.js` - Analysis records with full CRUD
  - `models/AuditLog.js` - Security audit logging
- ✅ Middleware layer
  - `middleware/auth.js` - Authentication & authorization (requireAuth, requireAdmin, etc.)
  - `middleware/errorHandler.js` - Centralized error handling
- ✅ Complete API Routes
  - `routes/auth.js` - Login, logout, session management
  - `routes/analyze.js` - 5 Why analysis creation, history, translation
  - `routes/admin.js` - User management, dashboard, audit logs
- ✅ Updated server.js
  - Added helmet security headers
  - Added express-session authentication
  - Added rate limiting (15 min window, 100 requests max)
  - Integrated all routes
  - Health check endpoints
  - Graceful shutdown handling
- ✅ API Testing
  - Fixed SQL parameter binding issues in User.getAll and Analysis.getByUserId/getAll
  - Tested authentication flow (login/logout)
  - Tested protected endpoints with sessions
  - Verified database integration

### Added (Phase 0: 專案初始化)
- ✅ Project folder structure created
  - `models/` - Database models directory
  - `routes/` - API routes directory
  - `templates/` - Frontend templates directory
  - `static/` - Static assets (css, js, images)
  - `docs/` - Documentation directory
  - `scripts/` - Utility scripts directory

- ✅ Environment configuration
  - Created `.env.example` with all required environment variables
  - Created `.env` with actual configuration
  - Added `dotenv` package for environment management

- ✅ Version control setup
  - Created `.gitignore` for Node.js, Python, and IDE files
  - Excluded sensitive files (.env, security_audit.md)
  - Ready for Git initialization

- ✅ Dependencies management
  - Updated `package.json` with enterprise-grade packages:
    - Security: `bcryptjs`, `helmet`, `express-rate-limit`
    - Database: `mysql2` with connection pooling
    - Session: `express-session`
    - CSV: `csv-parser`, `json2csv`
  - Added scripts: `db:init`, `db:test`

- ✅ Documentation
  - Created comprehensive `README_FULL.md`
  - Created `docs/user_command_log.md` for tracking user requests
  - Documented all completed Phase 0 tasks

### Added (Phase 2: 資料庫架構)
- ✅ Database configuration
  - Created `config.js` with database connection pool
  - MySQL connection details configured
  - Connection testing functionality

- ✅ Database schema design
  - Created `docs/db_schema.sql` with complete table definitions:
    - `users` - User management with 3-tier permissions
    - `analyses` - Analysis records with JSON storage
    - `analysis_perspectives` - Multiple perspective analysis
    - `analysis_whys` - Detailed 5 Why records
    - `llm_configs` - LLM API configurations
    - `system_settings` - System parameters
    - `audit_logs` - Security audit trail
    - `sessions` - User session management

  - Created views:
    - `user_analysis_stats` - User statistics dashboard
    - `recent_analyses` - Recent 100 analyses

- ✅ Database documentation
  - Created comprehensive `docs/db_schema.md`
  - Detailed table descriptions with field explanations
  - Entity relationship diagrams
  - Index strategy documentation
  - Data dictionary with code mappings

- ✅ Database initialization
  - Created `scripts/init-database.js` for schema setup
  - Created `scripts/init-database-simple.js` (simplified version)
  - Created `scripts/test-db-connection.js` for testing
  - Successfully initialized 8 core tables + 2 views
  - Inserted default data:
    - 3 demo users (admin, user001, user002)
    - 1 Ollama LLM configuration
    - 6 system settings

### Technical Details
- **Database**: MySQL 9.4.0 at mysql.theaken.com:33306
- **Database Name**: db_A102
- **Character Set**: utf8mb4_unicode_ci
- **Engine**: InnoDB with foreign key constraints
- **Default Admin**: admin@example.com (password in .env)

### Files Added
```
5why/
├── .env                          # Environment variables
├── .env.example                  # Environment template
├── .gitignore                    # Git ignore rules
├── config.js                     # Configuration module
├── package.json                  # Updated with new dependencies
├── docs/
│   ├── db_schema.sql            # Database schema SQL
│   ├── db_schema.md             # Database documentation
│   ├── user_command_log.md      # User command tracking
│   └── CHANGELOG.md             # This file
├── scripts/
│   ├── init-database.js         # DB initialization script
│   ├── init-database-simple.js  # Simplified DB init
│   └── test-db-connection.js    # DB connection test
└── README_FULL.md               # Comprehensive README
```

### Database Tables Created
1. `users` - 3 rows (1 admin, 2 test users)
2. `analyses` - 0 rows
3. `analysis_perspectives` - 0 rows
4. `analysis_whys` - 0 rows
5. `llm_configs` - 1 row (Ollama config)
6. `system_settings` - 6 rows
7. `audit_logs` - 0 rows
8. `sessions` - 0 rows
9. `user_analysis_stats` (view)
10. `recent_analyses` (view)

### Dependencies Added
- `dotenv@^16.3.1` - Environment variables
- `bcryptjs@^2.4.3` - Password encryption
- `express-session@^1.17.3` - Session management
- `express-rate-limit@^7.1.5` - API rate limiting
- `mysql2@^3.6.5` - MySQL database driver
- `helmet@^7.1.0` - Security headers
- `csv-parser@^3.0.0` - CSV import
- `json2csv@^6.0.0-alpha.2` - CSV export

### Configuration
- Gitea Repository: https://gitea.theaken.com/
- Gitea User: donald
- Database Host: mysql.theaken.com:33306
- Ollama API: https://ollama_pjapi.theaken.com
- Model: qwen2.5:3b

---

## Next Steps (Phase 1-9)

### Phase 1: 版本控制設定 (Pending)
- [ ] Initialize Git repository
- [ ] Create Gitea remote repository
- [ ] Configure Git remote origin
- [ ] Create `.gitkeep` in empty folders
- [ ] Initial commit and push

### Phase 3: UI/UX 預覽確認 (Pending)
- [ ] Create `preview.html` (frontend only, no database)
- [ ] Confirm UI/UX design with user
- [ ] Get user approval before proceeding

### Phase 4: 核心程式開發 (Pending)
- [ ] Create `app.js` or enhanced `server.js`
- [ ] Implement database models in `models/`
- [ ] Implement API routes in `routes/`
- [ ] Integrate with database
- [ ] Add error handling
- [ ] Add logging

### Phase 5: 管理者功能開發 (Pending)
- [ ] Admin dashboard at `/admin`
- [ ] User management (CRUD)
- [ ] LLM configuration interface
- [ ] System settings interface
- [ ] Audit log viewer

### Phase 6: 通用功能實作 (Pending)
- [ ] Error handling modal
- [ ] CSV import/export for all tables
- [ ] Column sorting on list pages
- [ ] Loading indicators
- [ ] Success/failure notifications

### Phase 7: 資安檢視 (Pending)
- [ ] Create `security_audit.md`
- [ ] Check SQL Injection protection
- [ ] Check XSS protection
- [ ] Verify CSRF tokens
- [ ] Verify password encryption
- [ ] Verify API rate limiting
- [ ] Check for sensitive information leaks
- [ ] Verify session security

### Phase 8: 文件維護 (Pending)
- [ ] Create/update `SDD.md` with version number
- [ ] Update `user_command_log.md`
- [ ] Update `CHANGELOG.md` (this file)
- [ ] Create `API_DOC.md`

### Phase 9: 部署前檢查 (Pending)
- [ ] Verify `.env.example` is complete
- [ ] Update `requirements.txt` or `package.json`
- [ ] Remove sensitive information from code
- [ ] Run functionality tests
- [ ] Final commit and push to Gitea

---

## Version History

| Version | Date | Status | Description |
|---------|------|--------|-------------|
| 1.0.0 | 2025-12-05 | In Progress | Initial version with Phase 0 & 2 completed |
| 0.1.0 | 2025-12-05 | Prototype | Basic React frontend with Ollama API |

---

**Maintainer**: System Administrator
**Last Updated**: 2025-12-05
**Document Version**: 1.0.0