# Portfolio Project Development Rules

## Code Style & Formatting

### TypeScript
- **Tab indentation** (not spaces), **double quotes**, **semicolons** required
- **Explicit function return types** for all functions (except inline expressions)
- **Never use `any` type** - always provide proper typing
- Prefix **interfaces with `I`** (e.g., `IProps`), **PascalCase** for type aliases
- Underscore prefix for unused variables (e.g., `_unusedParam`)
- Avoid non-null assertions (`!`) - use proper null checks

### React & JSX
- Components return `JSX.Element`, functional components with hooks only
- Self-closing tags for components without children: `<Intro/>`
- No prop-types (using TypeScript)

### Spacing & Formatting
- **Object curly spacing**: `{ foo }`, **no array bracket spacing**: `[1, 2]`
- **No trailing commas**, arrow spacing: `() => {}`
- Max **1 empty line** between blocks, end files with newline, no trailing spaces

### Imports
- Use path alias `@/*` (configured in tsconfig)
- Group: external deps first, then internal modules
- Import from `@/src/portfolio/...` and `@/src/styles/...`

## Project Structure

### File Organization
- **Pages**: `/pages/*.tsx` (pages router, not app router)
- **Components**: `/src/portfolio/sections/*.tsx`
- **Styles**: `/src/styles/*.scss` with helpers
- **Data**: `/src/portfolio/data/`, **Helpers**: `/src/portfolio/helpers/`
- **Public**: `/public/` (PDFs, images, icons)

### Component Structure
- Section components in `/src/portfolio/sections/`, main page in `/src/portfolio/MainPage.tsx`
- Each section has single responsibility

## Styling & Libraries

### SCSS
- Import helpers: `@import "helpers";`, use variables: `$accent_colour`
- BEM-like naming, `!important` only for library overrides (Splide)

### Animations
- **AOS** (scroll), **Anime.js** (complex), **react-transition-group** (transitions)
- Respect `prefers-reduced-motion`

### Tech Stack
- **Next.js 15** (pages router), **React 18.2**, **TypeScript 5.1**, **SASS**
- **@splidejs/react-splide**, **react-icons**, **Sharp**
- Dev server on **port 4000**: `npm run dev`

## Development Workflow

### Commands
- `npm run dev` - Start dev server (port 4000)
- `npm run lintfix` - Auto-fix linting issues
- `npm run lint` - Check for issues
- `npm run build` - Production build

### Windsurf Commands Helper Script
The project includes `windsurf-commands.sh` for common development tasks:

```bash
./windsurf-commands.sh lint      # Run ESLint to check for code issues
./windsurf-commands.sh lintfix   # Run ESLint with auto-fix enabled
./windsurf-commands.sh help      # Show available commands
```

**Usage in AGENTS.md:**
- When referencing linting in rules, can use either `npm run lint` or `./windsurf-commands.sh lint`
- Script provides consistent interface for development commands
- Includes error handling and user-friendly output

### Before Committing
1. Run `npm run lintfix` and `npm run lint`
2. Ensure TypeScript compiles
3. Test changes in browser

## File Naming
- **Components**: PascalCase (`MainPage.tsx`)
- **Utilities**: camelCase (`helpers.ts`)
- **Styles**: kebab-case/camelCase (`main.scss`)

## Common Patterns

```typescript
// Component
const ComponentName = (): JSX.Element => {
	return <div>{/* content */}</div>;
};
export default ComponentName;

// Interface
interface IComponentProps {
	title: string;
	isActive: boolean;
}
```

```scss
// SCSS
@import "helpers";
.component { color: $accent_colour; }
```

## Code Complexity Constraints

### Strict Limits (ESLint Enforced)
- **Max line length**: 120 characters (ignores URLs, strings, template literals)
- **Max file length**: 300 lines (excluding blank lines and comments)
- **Max function length**: 50 lines (excluding blank lines and comments)
- **Max cyclomatic complexity**: 10 per function
- **Max nesting depth**: 4 levels
- **Max parameters**: 4 per function
- **Max nested callbacks**: 3 levels
- **Max statements**: 20 per function

### Refactoring Strategies

When files exceed limits, use these approaches:

1. **Split by logical sections**: Break large files into feature folders with main component, sub-components, helpers, types, and index.ts
2. **Extract helper functions**: Move utility functions to separate `helpers.ts` files
3. **Extract types**: Move interfaces/types to separate `types.ts` files
4. **Break down complex functions**: Use sub-functions, early returns, extract conditionals, use lookup objects

**Folder structure example:**
```
/src/portfolio/sections/Experience/
  Experience.tsx, ExperienceCard.tsx, helpers.ts, types.ts, index.ts
```

**Handling violations:**
1. Analyze what limit was exceeded
2. Choose appropriate strategy
3. Plan folder structure
4. Execute incrementally (create files, move code, update imports, test)
5. Verify with `npm run lint`

**Line length fixes:** Break strings, split chains, extract variables, reformat JSX
**Parameter count fixes:** Use object parameters, configuration objects, or split function

## QA and Testing

### Pre-Testing Checklist

Before running any tests, verify the development server is running:

1. **Check if dev server is running** using `lsof`:
   ```bash
   lsof -i :4000
   ```
   - If output shows a process, server is running
   - If no output, start the server with `npm run dev`

2. **Verify server accessibility**:
   ```bash
   curl -I http://localhost:4000
   ```
   - Should return HTTP 200 OK
   - If connection refused, server needs to be started

### Playwright MCP Testing Workflow

When testing changes or new features, follow this systematic approach:

#### Step 1: Environment Setup
1. Ensure dev server is running on port 4000
2. Install Playwright browsers if needed (use `mcp0_browser_install` if errors occur)
3. Navigate to `http://localhost:4000`

#### Step 2: Visual Testing
Use Playwright MCP to verify visual elements:

1. **Take accessibility snapshot** (`mcp0_browser_snapshot`):
   - Captures page structure and content
   - Better than screenshots for testing
   - Use this to verify all sections are present

2. **Check key sections are visible**:
   - Intro section with name/title
   - Achievements section
   - Experience section with carousel
   - Projects section
   - Skills and Links section
   - Footer

3. **Verify responsive behavior**:
   - Test at different viewport sizes using `mcp0_browser_resize`
   - Common breakpoints: 375px (mobile), 768px (tablet), 1920px (desktop)
   - Check that content adapts properly

#### Step 3: Functional Testing
Test interactive elements:

1. **Navigation and scrolling**:
   - Verify smooth scroll behavior (if `prefers-reduced-motion: no-preference`)
   - Test anchor links if present
   - Check scroll-triggered animations (AOS)

2. **Carousel functionality** (Splide):
   - Click next/previous arrows using `mcp0_browser_click`
   - Verify slides change correctly
   - Check pagination dots are clickable
   - Ensure carousel is responsive

3. **Interactive elements**:
   - Test any buttons, links, or accordions
   - Verify hover states work
   - Check click handlers fire correctly
   - Test form inputs if present

4. **External links**:
   - Verify PDF links open correctly (CV, research papers)
   - Check social media links
   - Ensure `target="_blank"` and `rel="noopener noreferrer"` where needed

#### Step 4: Accessibility Testing

1. **Contrast ratios**:
   - Use `mcp0_browser_evaluate` to check computed styles
   - Verify text has sufficient contrast against backgrounds
   - Check accent color (`$accent_colour`) meets WCAG AA standards (4.5:1 for normal text)

2. **Keyboard navigation**:
   - Use `mcp0_browser_press_key` to test Tab navigation
   - Verify focus indicators are visible
   - Check all interactive elements are keyboard accessible
   - Test Escape key for modals/overlays

3. **ARIA labels and semantic HTML**:
   - Check snapshot for proper heading hierarchy (h1, h2, h3)
   - Verify buttons have accessible names
   - Check images have alt text
   - Ensure landmarks are properly labeled

4. **Screen reader compatibility**:
   - Verify meaningful content order in accessibility snapshot
   - Check that hidden decorative elements are properly hidden
   - Ensure dynamic content updates are announced

#### Step 5: Performance Checks

1. **Console errors**:
   - Use `mcp0_browser_console_messages` to check for errors
   - Verify no React warnings in development
   - Check for missing image errors
   - Look for failed network requests

2. **Network requests**:
   - Use `mcp0_browser_network_requests` to inspect requests
   - Verify images are optimized (using Next.js Image)
   - Check for unnecessary requests
   - Ensure no 404s or failed requests

3. **Animation performance**:
   - Verify AOS animations trigger smoothly
   - Check Anime.js animations don't cause jank
   - Test on reduced motion preference

#### Step 6: Cross-Section Integration

1. **Section transitions**:
   - Scroll through all sections
   - Verify spacing between sections is consistent
   - Check that animations don't overlap or conflict

2. **Data consistency**:
   - Verify project data displays correctly
   - Check experience timeline is accurate
   - Ensure skills list is complete and categorized

3. **Asset loading**:
   - Verify all images load (profile, project screenshots)
   - Check PDFs are accessible
   - Ensure icons render correctly (react-icons)

### Testing Checklist Template

When testing a new feature or change, use this checklist:

- [ ] Dev server running on port 4000
- [ ] Page loads without errors (check console)
- [ ] All sections render correctly (accessibility snapshot)
- [ ] Responsive at mobile (375px), tablet (768px), desktop (1920px)
- [ ] Interactive elements work (carousels, buttons, links)
- [ ] Keyboard navigation functional (Tab, Enter, Escape)
- [ ] Contrast ratios meet WCAG AA standards
- [ ] No console errors or warnings
- [ ] Network requests successful (no 404s)
- [ ] Animations smooth and respect reduced motion
- [ ] External links open correctly
- [ ] Images optimized and load properly

### Common Test Scenarios

#### Testing a New Section Component
```typescript
// 1. Check server is running
lsof -i :4000

// 2. Navigate and snapshot
mcp0_browser_navigate → http://localhost:4000
mcp0_browser_snapshot

// 3. Verify section appears
// Look for section in snapshot output

// 4. Test responsiveness
mcp0_browser_resize → 375x667 (mobile)
mcp0_browser_snapshot
mcp0_browser_resize → 1920x1080 (desktop)
mcp0_browser_snapshot

// 5. Check console
mcp0_browser_console_messages
```

#### Testing Accessibility
```typescript
// 1. Check contrast
mcp0_browser_evaluate → 
  function: () => {
    const el = document.querySelector('.your-element');
    const styles = window.getComputedStyle(el);
    return {
      color: styles.color,
      backgroundColor: styles.backgroundColor
    };
  }

// 2. Test keyboard navigation
mcp0_browser_press_key → Tab
mcp0_browser_snapshot → verify focus
mcp0_browser_press_key → Enter
mcp0_browser_snapshot → verify action

// 3. Check ARIA
mcp0_browser_snapshot → review for proper labels
```

### When to Run Tests

- **Before committing**: Run basic visual and console checks
- **After adding new section**: Full section integration test
- **After styling changes**: Visual + contrast + responsive tests
- **After adding interactivity**: Functional + keyboard + accessibility tests
- **Before production build**: Complete checklist + all scenarios

### Debugging Failed Tests

1. **Visual issues**: Take screenshot with `mcp0_browser_take_screenshot` for detailed inspection
2. **Functional issues**: Use `mcp0_browser_evaluate` to inspect element state
3. **Network issues**: Check `mcp0_browser_network_requests` for failed requests
4. **Console errors**: Review `mcp0_browser_console_messages` for stack traces
5. **Timing issues**: Use `mcp0_browser_wait_for` to wait for elements/animations

## Notes
- This is a **portfolio website** showcasing projects, experience, achievements, and skills
- Runs on **port 4000** (not default 3000)
- Uses **pages router** (not app router)
- Strict TypeScript and ESLint configuration for code quality
- Tab-based indentation is non-negotiable (project standard)
- **Code complexity limits are strictly enforced** - refactor proactively
- **Always test changes with Playwright MCP** before committing
- **IMPORTANT: Always use Windsurf rules** - they are allowed by default and enable much faster AI development progress