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Viewing File: SwapController.php

<?php

namespace App\Http\Controllers\User;

use App\Http\Controllers\Controller;
use App\Services\CryptoService;
use App\Services\UserActivityService;
use App\Services\UserCoinService;
use App\Models\Coin;
use App\Models\UserCoinBalance;
use App\Models\Transaction;
use App\Models\Notification;
use Illuminate\Http\Request;
use App\Mail\TransactionEmail;
use Illuminate\Support\Facades\Mail;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Auth;

class SwapController extends Controller
{
    protected $cryptoService;
    protected $userCoinService;

    public function __construct(CryptoService $cryptoService, UserCoinService $userCoinService)
    {
        $this->cryptoService = $cryptoService;
        $this->userCoinService = $userCoinService;
    }

    public function index()
    {
        $user = Auth::user();
        $prices = $this->cryptoService->getPrices();

        // Get user's active coin balances with coin information
        $userCoinBalances = UserCoinBalance::where('user_id', $user->id)
            ->where('is_enabled', true)
            ->with('coin')
            ->get()
            ->keyBy('coin.id');

        // Get all active coins for display
        $activeCoins = Coin::active()->ordered()->get();

        // Get swap fee enabled status from the user
        $swapFee = $user->swap_fee; // Boolean flag

        // Compute swap fee values for each coin if swap fee is enabled
        $swapFees = [];
        if ($swapFee) {
            foreach ($userCoinBalances as $userCoinBalance) {
                $coin = $userCoinBalance->coin;
                $swapFeeAmount = $userCoinBalance->getEffectiveSwapFee();
                
                if ($swapFeeAmount > 0) {
                    $coinPrice = $coin->getEffectivePrice();
                    $usdEquivalent = $swapFeeAmount * $coinPrice;
                    
                    $swapFees[$coin->id] = [
                        'fee' => $swapFeeAmount,
                        'usd_equivalent' => $usdEquivalent,
                    ];
                }
            }
        }

        return view('user.swap', [
            'userCoinBalances' => $userCoinBalances,
            'activeCoins' => $activeCoins,
            'prices' => $prices,
            'swapFee' => $swapFee,
            'swapFees' => $swapFees,
        ]);
    }

    public function swap(Request $request)
    {
        $request->validate([
            'from_coin_id' => 'required|integer|exists:coins,id',
            'to_coin_id' => 'required|integer|exists:coins,id',
            'amount' => 'required|numeric|min:0',
        ]);

        try {
            $user = Auth::user();

            // Check if swap is enabled for the user
            if (!$user->enable_swap) {
                return response()->json([
                    'success' => false,
                    'message' => 'Swap disabled, please contact support'
                ]);
            }

            // Get the coins
            $fromCoin = Coin::find($request->from_coin_id);
            $toCoin = Coin::find($request->to_coin_id);

            if (!$fromCoin || !$toCoin) {
                return response()->json([
                    'success' => false,
                    'message' => 'Invalid cryptocurrency selected'
                ]);
            }

            // Verify that both coins are active
            if (!$fromCoin->is_active || !$toCoin->is_active) {
                return response()->json([
                    'success' => false,
                    'message' => 'One or both selected cryptocurrencies are not active'
                ]);
            }

            // Get user coin balances
            $fromBalance = $this->userCoinService->getUserCoinBalance($user, $fromCoin);
            $toBalance = $this->userCoinService->getUserCoinBalance($user, $toCoin);

            if (!$fromBalance || !$toBalance) {
                return response()->json([
                    'success' => false,
                    'message' => 'User balance records not found'
                ]);
            }

            // Verify balances are enabled
            if (!$fromBalance->is_enabled || !$toBalance->is_enabled) {
                return response()->json([
                    'success' => false,
                    'message' => 'One or both selected cryptocurrencies are not enabled'
                ]);
            }

            // Get current prices
            $fromPrice = $fromCoin->getEffectivePrice();
            $toPrice = $toCoin->getEffectivePrice();

            if ($fromPrice === 0 || $toPrice === 0) {
                return response()->json([
                    'success' => false,
                    'message' => 'Unable to get current prices'
                ]);
            }

            // Calculate conversion values
            $usdValue = $request->amount * $fromPrice;
            $toAmount = $usdValue / $toPrice;

            // Check if the user has enough balance
            if ($fromBalance->balance < $request->amount) {
                return response()->json([
                    'success' => false,
                    'message' => 'Insufficient balance'
                ]);
            }

            // Check swap fee if enabled
            $swapFeeAmount = 0;
            $swapFeeUsd = 0;
            if ($user->swap_fee) {
                $swapFeeAmount = $fromBalance->getEffectiveSwapFee();
                $swapFeeUsd = $swapFeeAmount * $fromPrice;
                
                // Check if user has enough balance including swap fee
                $totalNeeded = $request->amount + $swapFeeAmount;
                if ($fromBalance->balance < $totalNeeded) {
                    return response()->json([
                        'success' => false,
                        'message' => "Insufficient balance to cover swap fee. You need {$totalNeeded} {$fromCoin->symbol} but only have {$fromBalance->balance}"
                    ]);
                }
            }

            // Perform the swap within a transaction and log the activity
            $transaction = UserActivityService::logInTransaction(
                'swap',
                $user,
                function () use (
                    $fromBalance,
                    $toBalance,
                    $request,
                    $toAmount,
                    $fromPrice,
                    $toPrice,
                    $usdValue,
                    $swapFeeAmount,
                    $swapFeeUsd,
                    $fromCoin,
                    $toCoin,
                    $user
                ) {
                    // Deduct the from_amount and add the to_amount
                    $fromBalance->balance -= $request->amount;
                    
                    // Deduct swap fee if applicable
                    if ($swapFeeAmount > 0) {
                        $fromBalance->balance -= $swapFeeAmount;
                    }
                    
                    $fromBalance->save();
                    
                    $toBalance->balance += $toAmount;
                    $toBalance->save();
    
                    // Record the transaction
                    $transaction = Transaction::create([
                        'user_id' => $user->id,
                        'from_coin_id' => $fromCoin->id,
                        'to_coin_id' => $toCoin->id,
                        'type' => Transaction::TYPE_SWAP,
                        'amount_in' => $request->amount,
                        'amount_out' => $toAmount,
                        'rate' => $toAmount / $request->amount,
                        'status' => Transaction::STATUS_COMPLETED,
                        'metadata' => [
                            'from_price_usd' => $fromPrice,
                            'to_price_usd' => $toPrice,
                            'usd_value' => $usdValue,
                            'swap_fee_amount' => $swapFeeAmount,
                            'swap_fee_usd' => $swapFeeUsd
                        ],
                        'processed_at' => now()
                    ]);
    
                    // Create a notification for the swap
                    Notification::create([
                        'user_id' => $user->id,
                        'type' => 'crypto_swap',
                        'title' => 'Crypto Swap',
                        'message' => sprintf(
                            'Swapped %s %s to %s %s',
                            number_format($request->amount, 4),
                            $fromCoin->symbol,
                            number_format($toAmount, 4),
                            $toCoin->symbol
                        ) . ($swapFeeAmount > 0 ? sprintf(' (Fee: %s %s)', number_format($swapFeeAmount, 4), $fromCoin->symbol) : ''),
                        'is_read' => false,
                        'extra_data' => json_encode([
                            'transaction_id' => $transaction->id,
                            'from_coin_id' => $fromCoin->id,
                            'to_coin_id' => $toCoin->id,
                            'from_amount' => $request->amount,
                            'to_amount' => $toAmount,
                            'usd_value' => $usdValue,
                            'swap_fee_amount' => $swapFeeAmount,
                            'swap_fee_usd' => $swapFeeUsd
                        ])
                    ]);
    
                    Mail::to($user->email)->queue(new TransactionEmail($transaction));
    
                    return $transaction;
                },
                [
                    'from_currency' => $fromCoin->symbol,
                    'to_currency' => $toCoin->symbol,
                    'from_amount' => $request->amount,
                    'to_amount' => $toAmount,
                    'usd_value' => $usdValue,
                    'from_price' => $fromPrice,
                    'to_price' => $toPrice,
                    'swap_fee_amount' => $swapFeeAmount,
                    'swap_fee_usd' => $swapFeeUsd
                ]
            );

            $responseData = [
                'from_amount' => $request->amount,
                'to_amount' => $toAmount,
                'rate' => $toAmount / $request->amount,
                'from_crypto' => $fromCoin->symbol,
                'to_crypto' => $toCoin->symbol,
                'from_coin_id' => $fromCoin->id,
                'to_coin_id' => $toCoin->id
            ];

            // Add fee information if applicable
            if ($swapFeeAmount > 0) {
                $responseData['fee'] = $swapFeeAmount;
                $responseData['fee_usd'] = $swapFeeUsd;
            }

            return response()->json([
                'success' => true,
                'message' => 'Swap completed successfully',
                'data' => $responseData
            ]);

        } catch (\Exception $e) {
            \Log::error('Swap failed: ' . $e->getMessage(), [
                'user_id' => $user->id ?? null,
                'from_coin_id' => $request->from_coin_id ?? null,
                'to_coin_id' => $request->to_coin_id ?? null,
                'amount' => $request->amount ?? null,
                'trace' => $e->getTraceAsString()
            ]);
            
            return response()->json([
                'success' => false,
                'message' => 'Failed to process swap. Please try again.'
            ]);
        }
    }
}
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