132 lines
5.5 KiB
PHP
132 lines
5.5 KiB
PHP
<?php
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require_once 'includes/header.php';
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if (!$user) {
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header('Location: login.php');
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exit;
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}
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$error = '';
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$success = '';
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if ($_SERVER['REQUEST_METHOD'] === 'POST') {
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$from_coin = $_POST['from_coin'] ?? 'USDT';
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$to_coin = $_POST['to_coin'] ?? 'BTC';
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$amount = (float)($_POST['amount'] ?? 0);
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if ($amount <= 0) {
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$error = 'Invalid amount.';
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} elseif ($from_coin === $to_coin) {
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$error = 'Cannot exchange same currency.';
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} else {
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try {
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$pdo = db();
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if ($from_coin === 'USDT') {
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if ($user['balance_usdt'] < $amount) {
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$error = 'Insufficient USDT balance.';
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} else {
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$rate = 43250.50;
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if ($to_coin === 'ETH') $rate = 2345.20;
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if ($to_coin === 'SOL') $rate = 102.45;
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if ($to_coin === 'OKB') $rate = 54.12;
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$receive = $amount / $rate;
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$pdo->prepare("UPDATE users SET balance_usdt = balance_usdt - ? WHERE id = ?")->execute([$amount, $user['id']]);
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$success = "Exchanged $amount USDT for " . number_format($receive, 6) . " $to_coin";
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$user['balance_usdt'] -= $amount;
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}
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} else {
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$error = "Only USDT to Crypto exchange is currently supported in this demo.";
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}
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} catch (Exception $e) {
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$error = 'Exchange failed: ' . $e->getMessage();
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}
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}
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}
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?>
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<div class="container my-5 py-5">
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<div class="row justify-content-center">
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<div class="col-md-6">
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<div class="card bg-dark border-secondary p-4 shadow-lg" style="border-radius: 20px;">
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<h2 class="fw-bold mb-4 text-center text-white"><?php echo mt('Exchange'); ?></h2>
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<p class="text-center text-muted mb-4">Zero fees, instant settlement</p>
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<?php if ($error): ?>
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<div class="alert alert-danger"><?php echo $error; ?></div>
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<?php endif; ?>
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<?php if ($success): ?>
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<div class="alert alert-success"><?php echo $success; ?></div>
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<?php endif; ?>
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<form method="POST">
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<div class="mb-4">
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<label class="small text-muted mb-2"><?php echo t('Amount'); ?></label>
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<div class="input-group input-group-lg">
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<input type="number" name="amount" class="form-control bg-dark text-white border-secondary" placeholder="0.00" required step="any">
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<select name="from_coin" class="btn btn-dark border-secondary">
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<option value="USDT">USDT</option>
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</select>
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</div>
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<div class="small text-muted mt-2"><?php echo mt('Available'); ?>: <?php echo number_format($user['balance_usdt'], 2); ?> USDT</div>
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</div>
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<div class="text-center mb-4">
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<div class="btn btn-outline-secondary rounded-circle" style="width: 40px; height: 40px; line-height: 25px;">
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<i class="fas fa-exchange-alt fa-rotate-90"></i>
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</div>
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</div>
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<div class="mb-4">
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<label class="small text-muted mb-2">To</label>
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<div class="input-group input-group-lg">
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<input type="text" class="form-control bg-dark text-white border-secondary" placeholder="0.00" readonly id="receive-amount">
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<select name="to_coin" id="to-coin" class="btn btn-dark border-secondary">
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<option value="BTC">BTC</option>
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<option value="ETH">ETH</option>
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<option value="SOL">SOL</option>
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<option value="OKB">OKB</option>
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</select>
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</div>
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</div>
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<div class="p-3 bg-secondary bg-opacity-10 rounded mb-4">
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<div class="d-flex justify-content-between small">
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<span class="text-muted">Estimated Price</span>
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<span class="text-white fw-bold" id="est-price">1 BTC ≈ 43,250 USDT</span>
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</div>
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</div>
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<button type="submit" class="btn btn-primary w-100 py-3 fw-bold fs-5" style="background-color: var(--okx-blue); border: none; border-radius: 12px;">
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Convert Now
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</button>
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</form>
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</div>
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</div>
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</div>
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</div>
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<script>
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const rates = {
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'BTC': 43250.50,
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'ETH': 2345.20,
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'SOL': 102.45,
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'OKB': 54.12
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};
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function updateReceive() {
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const amount = document.querySelector('input[name="amount"]').value;
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const coin = document.getElementById('to-coin').value;
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const rate = rates[coin];
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if (amount && rate) {
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document.getElementById('receive-amount').value = (amount / rate).toFixed(6);
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document.getElementById('est-price').innerText = `1 ${coin} ≈ ${rate.toLocaleString()} USDT`;
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}
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}
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document.querySelector('input[name="amount"]').addEventListener('input', updateReceive);
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document.getElementById('to-coin').addEventListener('change', updateReceive);
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</script>
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<?php require_once 'includes/footer.php'; ?>
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