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<?php
// Turn off error output to screen so we don't break the JSON response
ini_set('display_errors', 0);
error_reporting(E_ALL);
session_start();
require_once('includes/connect.php');
require_once('includes/functions.php');
// Tell the browser we are sending JSON data back
header('Content-Type: application/json');
// 1. Check Authentication
if (!isset($_SESSION['Email'])) {
echo json_encode(['status' => 'error', 'message' => 'Your session has expired. Please log in again.']);
exit();
}
// 2. CSRF Token Validation (Security against forged requests)
if (!isset($_POST['csrf_token']) || !hash_equals($_SESSION['csrf_token'], $_POST['csrf_token'])) {
echo json_encode(['status' => 'error', 'message' => 'Security token invalid. Please refresh the page and try again.']);
exit();
}
// 3. Fetch User Data
$user = GetMember1($_SESSION['Email']);
if (!$user) {
echo json_encode(['status' => 'error', 'message' => 'User account not found.']);
exit();
}
$userId = $user['ID'];
$userCapital = floatval($user['Capital']);
// 4. Sanitize and Validate POST Data
$poolId = isset($_POST['pool_id']) ? intval($_POST['pool_id']) : 0;
$amount = isset($_POST['investment_amount']) ? floatval($_POST['investment_amount']) : 0;
if ($poolId <= 0 || $amount <= 0) {
echo json_encode(['status' => 'error', 'message' => 'Invalid investment parameters.']);
exit();
}
try {
// 5. Verify the Mining Pool exists and is active
$stmtPool = $conn->prepare("SELECT name, min_investment, status FROM mining_pools WHERE id = ?");
$stmtPool->bind_param("i", $poolId);
$stmtPool->execute();
$resPool = $stmtPool->get_result();
if ($resPool->num_rows === 0) {
echo json_encode(['status' => 'error', 'message' => 'Mining pool not found.']);
exit();
}
$pool = $resPool->fetch_assoc();
$stmtPool->close();
if ($pool['status'] !== 'active') {
echo json_encode(['status' => 'error', 'message' => 'This mining pool is currently offline or inactive.']);
exit();
}
$minInvestment = floatval($pool['min_investment']);
if ($amount < $minInvestment) {
echo json_encode(['status' => 'error', 'message' => 'The minimum investment for this pool is ' . $user['sym'] . number_format($minInvestment, 2) . '.']);
exit();
}
// 6. Check Available Balance
if ($amount > $userCapital) {
echo json_encode([
'status' => 'error',
'message' => 'Insufficient capital! You only have ' . htmlspecialchars($user['sym']) . number_format($userCapital, 2) . ' available.'
]);
exit();
}
// Start a database transaction so we don't accidentally deduct money without saving the record
$conn->begin_transaction();
// 7. Deduct the amount from the user's Capital
$newCapital = $userCapital - $amount;
$updateCapStmt = $conn->prepare("UPDATE members SET Capital = ? WHERE ID = ?");
$updateCapString = strval($newCapital); // Cast to string for legacy database compatibility
$updateCapStmt->bind_param("si", $updateCapString, $userId);
$updateCapStmt->execute();
$updateCapStmt->close();
// 8. Insert the Investment into the user_minings table
$insertMineStmt = $conn->prepare("INSERT INTO user_minings (user_id, pool_id, amount_invested, status) VALUES (?, ?, ?, 'ACTIVE')");
$insertMineStmt->bind_param("iid", $userId, $poolId, $amount);
$insertMineStmt->execute();
$insertMineStmt->close();
// 9. (Optional) Insert record into Transactions table for accounting/history
$txType = 'MINING_INVESTMENT';
$txMethod = "Pool: " . $pool['name'];
$txStatus = 'COMPLETED';
$negAmount = -$amount; // Display as a deduction in transaction history
$insertTxStmt = $conn->prepare("INSERT INTO transactions (user_id, type, amount, method, status) VALUES (?, ?, ?, ?, ?)");
$insertTxStmt->bind_param("isdss", $userId, $txType, $negAmount, $txMethod, $txStatus);
$insertTxStmt->execute();
$insertTxStmt->close();
// Commit changes to the database
$conn->commit();
// Send Success Response back to Javascript
echo json_encode([
'status' => 'success',
'message' => 'Successfully joined ' . htmlspecialchars($pool['name']) . '! Your mining session has started.'
]);
} catch (Exception $e) {
$conn->rollback(); // Reverse the money deduction if the database insertion failed
echo json_encode(['status' => 'error', 'message' => 'System error: Could not process investment.']);
}
?>
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