Refactor event ticket Contract

[chauhan-varun]

EventTicketNFT Contract Update

Closes #65

🔄 Contract Changes

Key Improvements Made:

1. Enhanced Documentation: Added comprehensive NatSpec comments
2. State Variable Naming: Updated to follow Solidity best practices with s_ prefix
3. Custom Error Handling: Implemented custom errors for better gas efficiency
4. Input Validation: Added proper validation for addresses and token URIs
5. New Getter Function: Added getTokenCounter() function for transparency

Contract Features:

• ✅ Custom Errors: EventTicketNFT__InvalidOwnerAddress, EventTicketNFT__InvalidRecipientAddress, EventTicketNFT__EmptyTokenURI
• ✅ Enhanced Validation: Checks for zero addresses and empty URIs
• ✅ Improved State Management: Two separate counters for different minting functions
• ✅ Better Events: Consistent TicketMinted event emission

📁 Files Updated

Smart Contract

• ✅ contracts/EventTicketNFT.sol - Updated with enhanced features

Generated Artifacts

• ✅ artifacts/contracts/EventTicketNFT.sol/EventTicketNFT.json - New ABI generated
• ✅ server/abi/EventTicketNFT.json - Updated ABI for backend
• ✅ client/src/artifacts/contracts/EventTicketNFT.sol/EventTicketNFT.json - Updated ABI for frontend

Frontend Updates

• ✅ client/src/lib/ticketNFT.ts - Enhanced with new functions and error handling
• ✅ client/src/components/MintTicket.tsx - Improved error messages and validation
• ✅ client/src/hooks/useTokenCounter.ts - New hook for token counter
• ✅ client/src/components/TokenCounterDisplay.tsx - New component to display token count

Backend Updates

• ✅ server/listeners/mintListener.js - Updated ABI path for consistency
• ✅ Event listeners remain compatible with existing TicketMinted event

🚀 New Features Available

Frontend Functions:

// Existing function with enhanced error handling
mintTicket(tokenURI: string): Promise<string>

// New function for getting token counter
getTokenCounter(): Promise<number>

// New function for owner-only minting
safeMint(to: string, uri: string): Promise<string>

React Components:

// New hook for token counter
const { counter, loading, error, refresh } = useTokenCounter();

// New display component
<TokenCounterDisplay className="my-custom-class" />

🔗 Integration Notes

• All existing functionality remains intact
• Event listeners continue to work with the same TicketMinted event
• Frontend components have backward compatibility
• Enhanced error messages provide better UX
• New getTokenCounter() function allows for better UI updates

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