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Editing:coupon-add.php

<?php
$page = 'coupons';
$page_title = 'Add / Edit Coupon';
require_once '../includes/header.php';

$id = intval($_GET['id'] ?? 0);
$coupon = ['id' => 0, 'code' => '', 'type' => 'percentage', 'value' => 0, 'min_cart_amount' => 0, 'usage_limit' => 0, 'start_date' => '', 'end_date' => '', 'status' => 1];

if ($id) {
    $stmt = $db->prepare("SELECT * FROM coupons WHERE id = ?");
    $stmt->execute([$id]);
    $coupon = $stmt->fetch(PDO::FETCH_ASSOC);
    if (!$coupon) {
        admin_set_flash('error', 'Not found');
        header('Location: ' . ADMIN_PATH . 'pages/coupons.php');
        exit;
    }
    $page_title = 'Edit Coupon';
}

if ($_SERVER['REQUEST_METHOD'] == 'POST' && verify_csrf($_POST[CSRF_TOKEN_NAME] ?? '')) {
    $code = strtoupper(trim($_POST['code']));
    $type = $_POST['type'];
    $value = floatval($_POST['value']);
    $min_cart_amount = floatval($_POST['min_cart_amount'] ?? 0);
    $usage_limit = intval($_POST['usage_limit'] ?? 0);
    $start_date = !empty($_POST['start_date']) ? $_POST['start_date'] : null;
    $end_date = !empty($_POST['end_date']) ? $_POST['end_date'] : null;
    $status = intval($_POST['status']);
    
    try {
        if ($id) {
            $stmt = $db->prepare("UPDATE coupons SET code=?, type=?, value=?, min_cart_amount=?, usage_limit=?, start_date=?, end_date=?, status=? WHERE id=?");
            $stmt->execute([$code, $type, $value, $min_cart_amount, $usage_limit, $start_date, $end_date, $status, $id]);
            admin_set_flash('success', 'Coupon updated');
        } else {
            $stmt = $db->prepare("INSERT INTO coupons (code, type, value, min_cart_amount, usage_limit, start_date, end_date, status) VALUES (?, ?, ?, ?, ?, ?, ?, ?)");
            $stmt->execute([$code, $type, $value, $min_cart_amount, $usage_limit, $start_date, $end_date, $status]);
            admin_set_flash('success', 'Coupon added');
        }
        header('Location: ' . ADMIN_PATH . 'pages/coupons.php');
        exit;
    } catch (Exception $e) {
        $error = 'Failed: ' . $e->getMessage();
    }
}
?>

<div class="admin-card">
    <?php if (isset($error)): ?>
    <div class="alert alert-danger"><?= htmlspecialchars($error) ?></div>
    <?php endif; ?>
    
    <form method="POST">
        <?= csrf_field() ?>
        
        <div class="row g-4">
            <div class="col-md-6">
                <div class="form-group-admin">
                    <label class="form-label-admin">Coupon Code *</label>
                    <input type="text" name="code" class="form-control-admin" required value="<?= htmlspecialchars($coupon['code']) ?>" style="text-transform: uppercase;">
                </div>
                
                <div class="form-group-admin">
                    <label class="form-label-admin">Discount Type *</label>
                    <select name="type" class="form-control-admin" required>
                        <option value="percentage" <?= $coupon['type'] == 'percentage' ? 'selected' : '' ?>>Percentage (%)</option>
                        <option value="fixed" <?= $coupon['type'] == 'fixed' ? 'selected' : '' ?>>Fixed Amount (₹)</option>
                    </select>
                </div>
                
                <div class="form-group-admin">
                    <label class="form-label-admin">Discount Value *</label>
                    <input type="number" name="value" class="form-control-admin" required step="0.01" min="0" value="<?= $coupon['value'] ?>">
                </div>
                
                <div class="form-group-admin">
                    <label class="form-label-admin">Minimum Cart Amount</label>
                    <input type="number" name="min_cart_amount" class="form-control-admin" step="0.01" min="0" value="<?= $coupon['min_cart_amount'] ?>">
                </div>
            </div>
            
            <div class="col-md-6">
                <div class="form-group-admin">
                    <label class="form-label-admin">Usage Limit (0 = unlimited)</label>
                    <input type="number" name="usage_limit" class="form-control-admin" min="0" value="<?= $coupon['usage_limit'] ?>">
                </div>
                
                <div class="form-group-admin">
                    <label class="form-label-admin">Start Date</label>
                    <input type="date" name="start_date" class="form-control-admin" value="<?= $coupon['start_date'] ?>">
                </div>
                
                <div class="form-group-admin">
                    <label class="form-label-admin">End Date</label>
                    <input type="date" name="end_date" class="form-control-admin" value="<?= $coupon['end_date'] ?>">
                </div>
                
                <div class="form-group-admin">
                    <label class="form-label-admin">Status</label>
                    <select name="status" class="form-control-admin">
                        <option value="1" <?= $coupon['status'] == 1 ? 'selected' : '' ?>>Active</option>
                        <option value="0" <?= $coupon['status'] == 0 ? 'selected' : '' ?>>Inactive</option>
                    </select>
                </div>
            </div>
        </div>
        
        <hr style="margin: 30px 0;">
        
        <div class="d-flex gap-2">
            <button type="submit" class="btn-admin btn-primary-admin">
                <i class="fas fa-save"></i> <?= $id ? 'Update' : 'Add' ?>
            </button>
            <a href="<?= ADMIN_PATH ?>pages/coupons.php" class="btn-admin btn-secondary-admin">Cancel</a>
        </div>
    </form>
</div>

<?php require_once '../includes/footer.php'; ?>

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Editing:coupon-add.php