<?php
include("db/cn.php");
include("common/tx.php");
ini_set('display_errors', 1);
ini_set('display_startup_errors', 1);
error_reporting(E_ALL);
ob_start();

// Session check
if (!isset($_SESSION['user_name']) || !isset($_SESSION['user_role']) || !isset($_SESSION['outlet_name']) || !isset($_SESSION['outlet_address'])) {
    echo '<script type="text/javascript">window.location.href="logout.php";</script>';
    exit();
}

$userName       = $_SESSION['user_name'];
$userRole       = $_SESSION['user_role'];
$outlet_name    = $_SESSION['outlet_name'];
$outlet_address = $_SESSION['outlet_address'];

// ==========================
// Get cr_id from URL – strict validation
// ==========================
if (!isset($_GET['cr_id']) || !is_numeric($_GET['cr_id'])) {
    die("<div class='alert alert-danger m-4'>Invalid or missing Customer ID. <a href='view_creditor.php'>Go back</a></div>");
}
$cr_id = (int) $_GET['cr_id'];

// ==========================
// Update Record
// ==========================
if (isset($_POST['update'])) {
    $cr_name      = $_POST['cr_name'];
    $cr_nickname  = $_POST['cr_nickname'];
    $cr_address   = $_POST['cr_address'];
    $phone_number = $_POST['phone_number'];
    $openAmount   = $_POST['opening_balance'];
    $date_time    = $_POST['date_time'];

    // Update credit_note table
    $update = $connection->prepare("
        UPDATE credit_note SET
            cr_name = ?,
            cr_nickname = ?,
            cr_address = ?,
            phone_number = ?,
            date_time = ?
        WHERE cr_id = ?
    ");
    $update->bind_param("sssssi", $cr_name, $cr_nickname, $cr_address, $phone_number, $date_time, $cr_id);
    $updateOk = $update->execute();

    // Update opening amount
    $opUpdate = $connection->prepare("UPDATE creditor_opening_amount SET open_amount = ? WHERE creditor_name = ?");
    $opUpdate->bind_param("ds", $openAmount, $cr_name);
    $opUpdate->execute();

    if ($updateOk) {
        $success = "Credit Note Updated Successfully";
    } else {
        $error = "Update Failed";
    }
}

// ==========================
// Fetch Existing Record
// ==========================
$select = $connection->prepare("SELECT * FROM credit_note WHERE cr_id = ?");
$select->bind_param("i", $cr_id);
$select->execute();
$data = $select->get_result()->fetch_assoc();

if (!$data) {
    die("<div class='alert alert-danger m-4'>Record Not Found. <a href='view_creditor.php'>Go back</a></div>");
}

// Fetch opening balance for this customer
$opQuery = $connection->prepare("SELECT open_amount FROM creditor_opening_amount WHERE creditor_name = ?");
$opQuery->bind_param("s", $data['cr_name']);
$opQuery->execute();
$opResult = $opQuery->get_result()->fetch_assoc();
$openingBalance = $opResult['open_amount'] ?? '0.00';

ob_end_flush();
?>
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
    <meta name="description" content="">
    <meta name="author" content="">
    <title><?php echo htmlspecialchars($tx); ?></title>
    <link href="../vendor/fontawesome-free/css/all.min.css" rel="stylesheet" type="text/css">
    <link href="https://fonts.googleapis.com/css2?family=Quicksand:wght@200;300;400;500;600;700&display=swap" rel="stylesheet">
    <link href="../css/sb-admin-2.min.css" rel="stylesheet">
    <link href="../css/sb-admin-2.css" rel="stylesheet">
    <script src="https://cdn.jsdelivr.net/npm/chart.js"></script>
</head>
<style>
body {
    font-family: 'Quicksand', sans-serif;
}
.chart-container {
    position: relative;
    background: rgba(255, 255, 255, 0.9);
    border-radius: 10px;
    padding: 15px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.2);
}
canvas {
    max-width: 100%;
    height: auto;
}
.bg-gradient-primary {
    background: #0A4657;
    color: #fff;
}
.btn-primary {
    background: #0A4657;
    color: #fff;
    border: 1px #0A4657 solid;
}
.btn-primary:hover {
    background: #fff;
    border: 1px #0A4657 solid;
    color: #0A4657;
}
.fa-download:hover {
    color: #953E39;
}
.form-control {
    font-weight: 700;
    color: #000;
}
.btn {
    font-weight: 700;
}
</style>

<body id="page-top">

    <!-- Page Wrapper -->
    <div id="wrapper">

        <!-- Sidebar -->
        <?php include("common/sd.php"); ?>
        <!-- End of Sidebar -->

        <!-- Content Wrapper -->
        <div id="content-wrapper" class="d-flex flex-column">

            <!-- Main Content -->
            <div id="content">

                <!-- Topbar -->
                <nav class="navbar navbar-expand navbar-light bg-white topbar mb-4 static-top shadow">
                    <button id="sidebarToggleTop" class="btn btn-link d-md-none rounded-circle mr-3">
                        <i class="fa fa-bars"></i>
                    </button>
                    <?php include('common/log.php'); ?>
                </nav>
                <!-- End of Topbar -->

                <!-- Begin Page Content -->
                <div class="container mt-5">

                    <?php if (!empty($success)) : ?>
                        <div class="alert alert-success"><?= htmlspecialchars($success) ?></div>
                    <?php endif; ?>

                    <?php if (!empty($error)) : ?>
                        <div class="alert alert-danger"><?= htmlspecialchars($error) ?></div>
                    <?php endif; ?>

                    <div class="row">
                        <div class="col-3"></div>
                        <div class="col-6">
                            <h3 class="font-weight-bold" style="color:#000;">Edit Customer Detail</h3>
                            <br>
                            <form method="POST">
                                <div class="mb-3">
                                    <label class="form-label">Customer Name</label>
                                    <input type="text" name="cr_name" class="form-control"
                                           value="<?= htmlspecialchars($data['cr_name']) ?>" required>
                                </div>

                                <div class="mb-3">
                                    <label class="form-label">Nick Name</label>
                                    <input type="text" name="cr_nickname" class="form-control"
                                           value="<?= htmlspecialchars($data['cr_nickname']) ?>">
                                </div>

                                <div class="mb-3">
                                    <label class="form-label">Address</label>
                                    <input type="text" name="cr_address" class="form-control"
                                           value="<?= htmlspecialchars($data['cr_address']) ?>">
                                </div>

                                <div class="mb-3">
                                    <label class="form-label">Phone Number</label>
                                    <input type="text" name="phone_number" class="form-control"
                                           value="<?= htmlspecialchars($data['phone_number']) ?>">
                                </div>

                                <div class="mb-3">
                                    <label class="form-label">Date & Time</label>
                                    <input type="datetime-local" name="date_time" class="form-control"
                                           value="<?= date('Y-m-d\TH:i', strtotime($data['date_time'])) ?>">
                                </div>

                                <div class="mb-3">
                                    <label class="form-label">Opening Balance</label>
                                    <input type="text" name="opening_balance" class="form-control"
                                           value="<?= htmlspecialchars($openingBalance) ?>">
                                </div>

                                <button type="submit" name="update" class="btn btn-primary">
                                    Update Record
                                </button>

                                <a href="view_creditor.php" class="btn btn-secondary">
                                    Back
                                </a>
                            </form>
                        </div>
                        <div class="col-3"></div>
                    </div>
                </div>
                <!-- /.container-fluid -->

            </div>
            <!-- End of Main Content -->

            <!-- Footer -->
            <?php include("common/main_ft.php"); ?>
            <!-- End of Footer -->

        </div>
        <!-- End of Content Wrapper -->

    </div>
    <!-- End of Page Wrapper -->

    <!-- Scroll to Top Button-->
    <a class="scroll-to-top rounded" href="#page-top">
        <i class="fas fa-angle-up"></i>
    </a>

    <!-- Logout Modal-->
    <div class="modal fade" id="logoutModal" tabindex="-1" role="dialog" aria-labelledby="exampleModalLabel"
         aria-hidden="true">
        <div class="modal-dialog" role="document">
            <div class="modal-content">
                <div class="modal-header">
                    <h5 class="modal-title" id="exampleModalLabel">Ready to Leave?</h5>
                    <button class="close" type="button" data-dismiss="modal" aria-label="Close">
                        <span aria-hidden="true">×</span>
                    </button>
                </div>
                <div class="modal-body">Select "Logout" below if you are ready to end your current session.</div>
                <div class="modal-footer">
                    <button class="btn btn-secondary" type="button" data-dismiss="modal">Cancel</button>
                    <a class="btn btn-primary" href="">Logout</a>
                </div>
            </div>
        </div>
    </div>

    <script src="https://cdn.jsdelivr.net/npm/@popperjs/core@2.10.2/dist/umd/popper.min.js"></script>
    <!-- Bootstrap core JavaScript-->
    <script src="../vendor/jquery/jquery.min.js"></script>
    <script src="../vendor/bootstrap/js/bootstrap.bundle.min.js"></script>

    <!-- Core plugin JavaScript-->
    <script src="../vendor/jquery-easing/jquery.easing.min.js"></script>

    <!-- Custom scripts for all pages-->
    <script src="../js/sb-admin-2.min.js"></script>

</body>
</html>