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coin.php
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coin.php
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<!DOCTYPE html>
<html>
<?php if (!isset($_GET['c'])) $_GET['c'] = "Bitcoin"; ?>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta name="author" content="Joshua Devine and Abdullah Chaudry">
<meta name="description" content="Let Coiner handle all your Cryptocurrency needs">
<title><?php echo $_GET['c']; ?></title>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@4.6.0/dist/css/bootstrap.min.css" integrity="sha384-B0vP5xmATw1+K9KRQjQERJvTumQW0nPEzvF6L/Z6nronJ3oUOFUFpCjEUQouq2+l" crossorigin="anonymous">
<link rel="stylesheet" href="res/styles.css" />
<script src="https://cdn.jsdelivr.net/npm/chart.js@2.9.4/dist/Chart.min.js"></script>
<param name="" value="">
<script src="res/search.js"></script>
<script src="res/coins.js"></script>
</head>
<body>
<?php include("header.php") ?>
<div class="jumbotron">
<div class="container">
<h1><?php echo $_GET['c']; ?></h1>
<p class="text-center">Daily Change: <span id="featured-dc"></span></p>
<div>
<canvas id="canvas" height="400"></canvas>
</div>
</div>
</div>
<!-- USER IS LOGGED IN -->
<?php if (isset($_SESSION['user'])) {
require('connect-db.php');
loadWallet();
?>
<div class="container">
<div class="row">
<div class="col-3">
<h4>Purchase <?php echo $_GET['c']; ?></h4>
</div>
<div class="col-9">
- Your account balance (USD): <?php echo $_SESSION["wallet"]['balance']; ?>
</div>
<br>
<br>
</div>
<form class="form" action="<?php $_SERVER['PHP_SELF'] ?>" method="post">
<label for="coinAmount">Amount</label>
<div class="row">
<div class="col-8">
<input type="number" class="form-control" id="coinAmount" placeholder="0.00" name="amount" required></input>
<div class="invalid-feedback">
Valid coin amount is required.
</div>
</div>
<div class="col-4">
<button type="submit" name="transact" value="buy" class="btn btn-secondary" style="margin-left:5px; width:33%">Purchase</button>
</div>
</div>
<br>
<br>
</form>
</div>
<div class="container">
<div class="row">
<div class="col-3">
<h4>Sell <?php echo $_GET['c']; ?></h4>
</div>
<div class="col-9">
- Your <?php echo $_GET['c']; ?> balance: <?php echo $_SESSION["wallet"][$_GET['c']]; ?>
</div>
<br>
<br>
</div>
<form class="form" action="<?php $_SERVER['PHP_SELF'] ?>" method="post">
<label for="coinAmount">Amount</label>
<div class="row">
<div class="col-8">
<input type="number" class="form-control" id="coinAmount" placeholder="0.00" name="amount" required></input>
<div class="invalid-feedback">
Valid coin amount is required.
</div>
</div>
<div class="col-4">
<button type="submit" name="transact" value="sell" class="btn btn-secondary" style="margin-left:5px; width:33%">Sell</button>
</div>
</div>
<br>
<br>
</form>
</div>
<?php } ?>
<script>
<?php echo "var featured = '" . $_GET['c'] . "';\n"; ?>
var coins = [featured];
makeChart(featured);
window.setInterval(function() {
updateCoinValues(coins);
updateFeaturedCoin(featured);
updateChart(featured);
}, 1000);
</script>
<?php
// handle transaction requests by the user
if (isset($_POST['transact'])) {
try {
switch ($_POST['transact']) {
case 'buy':
buyCoin();
break;
case 'sell':
sellCoin();
break;
}
} catch (Exception $e) // handle any type of exception
{
$error_message = $e->getMessage();
echo "<p>Error message: $error_message </p>";
}
}
// handle coin purchase by user
function buyCoin()
{
if ($_POST["amount"] <= 0) return;
// get cost to purchase specified amount of coin
$cost = $_POST["amount"] * 20;
loadWallet();
// check that cost < USD balance
// error if insufficient funds
if ($_SESSION["wallet"]["balance"] < $cost) {
echo "ERROR: insufficient funds";
return;
}
// update wallet values
$_SESSION["wallet"]["balance"] -= $cost;
$_SESSION["wallet"][$_GET['c']] += $_POST["amount"];
updateWallet();
}
// handle coin sale by user
function sellCoin()
{
if ($_POST["amount"] <= 0) return;
// get amount owned
$cost = $_POST["amount"] * 20;
loadWallet();
// check that amount owned > amount specified
// error if insufficient coin funds
if ($_SESSION['wallet'][$_GET['c']] < $_POST["amount"]) {
echo "ERROR: insufficient coins";
return;
}
// update wallet values
$_SESSION["wallet"]["balance"] += $cost;
$_SESSION["wallet"][$_GET['c']] -= $_POST["amount"];
updateWallet();
}
?>
<?php include("footer.php") ?>
</body>
</html>