Solana Integration

import 'package:para/para.dart';

// Sign a Solana transaction
final para = Para(apiKey: 'your-api-key');
final wallet = (await para.fetchWallets()).firstWhere((w) => w.type == 'SOLANA');

final transaction = SolanaTransaction(
  to: '9WzDXwBbmkg8ZTbNMqUxvQRAyrZzDsGYdLVL9zYtAWWM',
  lamports: '1000000', // 0.001 SOL
  feePayer: null, // Uses wallet as fee payer
  recentBlockhash: null, // Fetched automatically with RPC URL
);

final result = await para.signTransaction(
  walletId: wallet.id!,
  transaction: transaction.toJson(),
  chainId: null, // Not needed for Solana
  rpcUrl: 'https://api.devnet.solana.com',
);
print('Transaction signed: ${result.signedTransaction}');

final transaction = SolanaTransaction(
  to: '9WzDXwBbmkg8ZTbNMqUxvQRAyrZzDsGYdLVL9zYtAWWM',
  lamports: '1000000', // 0.001 SOL
  feePayer: null, // Uses wallet as fee payer
  recentBlockhash: null, // Fetched automatically with RPC URL
);

final result = await para.signTransaction(
  walletId: wallet.id!,
  transaction: transaction.toJson(),
  chainId: null, // Not needed for Solana
  rpcUrl: 'https://api.devnet.solana.com',
);
print('Signed: ${result.signedTransaction}');

final balance = await para.getBalance(
  walletId: wallet.id!,
  token: null, // Native SOL
  rpcUrl: 'https://api.devnet.solana.com',
);

// Convert lamports to SOL
final lamports = double.parse(balance);
final sol = lamports / 1000000000;
print('Balance: ${sol.toStringAsFixed(4)} SOL');

final message = 'Hello, Solana!';
final result = await para.signMessage(
  walletId: wallet.id!,
  message: message,
);
print('Signature: ${result.signedTransaction}');

import 'package:flutter/material.dart';
import 'package:para/para.dart';

class SolanaWalletView extends StatefulWidget {
  final Para para;
  final Wallet wallet;
  
  const SolanaWalletView({required this.para, required this.wallet});
  
  @override
  State<SolanaWalletView> createState() => _SolanaWalletViewState();
}

class _SolanaWalletViewState extends State<SolanaWalletView> {
  bool _isLoading = false;
  String? _signature;
  final String _rpcUrl = 'https://api.devnet.solana.com';
  
  @override
  Widget build(BuildContext context) {
    return Padding(
      padding: const EdgeInsets.all(16),
      child: Column(
        children: [
          Text(
            widget.wallet.address ?? 'No address',
            style: TextStyle(fontFamily: 'monospace', fontSize: 12),
          ),
          SizedBox(height: 20),
          ElevatedButton(
            onPressed: _isLoading ? null : _signTransaction,
            child: Text(_isLoading ? 'Signing...' : 'Sign Transaction'),
          ),
          if (_signature != null)
            Padding(
              padding: const EdgeInsets.only(top: 20),
              child: Text('Signed: $_signature', style: TextStyle(fontSize: 12)),
            ),
        ],
      ),
    );
  }
  
  Future<void> _signTransaction() async {
    setState(() => _isLoading = true);
    try {
      final transaction = SolanaTransaction(
        to: '9WzDXwBbmkg8ZTbNMqUxvQRAyrZzDsGYdLVL9zYtAWWM',
        lamports: '1000000', // 0.001 SOL
        feePayer: null,
        recentBlockhash: null,
      );
      
      final result = await widget.para.signTransaction(
        walletId: widget.wallet.id!,
        transaction: transaction.toJson(),
        chainId: null, // Not needed for Solana
        rpcUrl: _rpcUrl,
      );
      setState(() => _signature = result.signedTransaction);
    } catch (e) {
      print('Error: $e');
    } finally {
      setState(() => _isLoading = false);
    }
  }
}

// Transaction with memo
final transaction = SolanaTransaction(
  to: '9WzDXwBbmkg8ZTbNMqUxvQRAyrZzDsGYdLVL9zYtAWWM',
  lamports: '1000000',
  memo: 'Payment for services',
);

// Transaction with custom blockhash
final transaction = SolanaTransaction(
  to: '9WzDXwBbmkg8ZTbNMqUxvQRAyrZzDsGYdLVL9zYtAWWM',
  lamports: '1000000',
  recentBlockhash: 'custom_blockhash',
  feePayer: wallet.address,
);