<?php
// Αρχείο: /var/www/html/hockey-cms/admin/categories.php
require_once 'admin_auth.php';
require_once '../config/database.php';

// --- Μηχανισμός Αλλαγής Γλώσσας ---
if (isset($_GET['lang']) && in_array($_GET['lang'], ['el', 'en'])) {
    $_SESSION['lang'] = $_GET['lang'];
}
$current_lang = $_SESSION['lang'] ?? 'el';

$translations = [
    'el' => [
        'manage_cats' => 'Διαχείριση Κατηγοριών',
        'edit_cat' => '✏️ Επεξεργασία Κατηγορίας',
        'add_cat' => '📁 Προσθήκη Νέας Κατηγορίας',
        'name_el' => 'Όνομα 🇬🇷 (Ελληνικά) *',
        'name_en' => 'Όνομα 🇬🇧 (Αγγλικά)',
        'parent_cat' => 'Ανήκει σε... (Προαιρετικό)',
        'is_main' => '-- Είναι Κεντρική Κατηγορία --',
        'attr_group' => 'Ομάδα Χαρακτηριστικών',
        'no_attr' => '-- Χωρίς Ειδικά Χαρακτηριστικά --',
        'btn_save' => 'Αποθήκευση Αλλαγών',
        'btn_add' => 'Προσθήκη Κατηγορίας',
        'btn_cancel' => 'Ακύρωση',
        'tree_title' => 'Δέντρο Κατηγοριών (Treeview)',
        'no_cats' => 'Δεν υπάρχουν κατηγορίες ακόμα.',
        'msg_add_ok' => 'Η κατηγορία προστέθηκε επιτυχώς!',
        'msg_edit_ok' => 'Η κατηγορία ενημερώθηκε επιτυχώς!',
        'msg_err_name' => 'Το Ελληνικό όνομα είναι υποχρεωτικό.',
        'msg_err_slug' => 'Σφάλμα: (Μήπως το URL/Slug υπάρχει ήδη;)',
        'msg_del_ok' => 'Η κατηγορία διεγράφη επιτυχώς!',
        'msg_err_prod' => 'Αδυναμία διαγραφής! Υπάρχουν προϊόντα σε αυτή την κατηγορία.',
        'msg_err_child' => 'Αδυναμία διαγραφής! Υπάρχουν υποκατηγορίες μέσα σε αυτή την κατηγορία.',
        'confirm_del' => 'Είστε σίγουρος ότι θέλετε να διαγράψετε αυτή την κατηγορία;'
    ],
    'en' => [
        'manage_cats' => 'Manage Categories',
        'edit_cat' => '✏️ Edit Category',
        'add_cat' => '📁 Add New Category',
        'name_el' => 'Name 🇬🇷 (Greek) *',
        'name_en' => 'Name 🇬🇧 (English)',
        'parent_cat' => 'Belongs to... (Optional)',
        'is_main' => '-- Is Main Category --',
        'attr_group' => 'Attribute Group',
        'no_attr' => '-- No Special Attributes --',
        'btn_save' => 'Save Changes',
        'btn_add' => 'Add Category',
        'btn_cancel' => 'Cancel',
        'tree_title' => 'Category Tree (Treeview)',
        'no_cats' => 'No categories found.',
        'msg_add_ok' => 'Category added successfully!',
        'msg_edit_ok' => 'Category updated successfully!',
        'msg_err_name' => 'The Greek name is required.',
        'msg_err_slug' => 'Error: (Maybe the URL/Slug already exists?)',
        'msg_del_ok' => 'Category deleted successfully!',
        'msg_err_prod' => 'Cannot delete! There are products in this category.',
        'msg_err_child' => 'Cannot delete! There are subcategories inside this category.',
        'confirm_del' => 'Are you sure you want to delete this category?'
    ]
];
$t = $translations[$current_lang];

header('Content-Type: text/html; charset=utf-8');

$message = '';

function createSlug($string) {
    $greek = ['α','ά','Α','Ά','β','Β','γ','Γ','δ','Δ','ε','έ','Ε','Έ','ζ','Ζ','η','ή','Η','Ή','θ','Θ','ι','ί','ϊ','ΐ','Ι','Ί','Ϊ','κ','Κ','λ','Λ','μ','Μ','ν','Ν','ξ','Ξ','ο','ό','Ο','Ό','π','Π','ρ','Ρ','σ','ς','Σ','τ','Τ','υ','ύ','ϋ','ΰ','Υ','Ύ','Ϋ','φ','Φ','χ','Χ','ψ','Ψ','ω','ώ','Ω','Ώ'];
    $latin = ['a','a','a','a','b','b','g','g','d','d','e','e','e','e','z','z','i','i','i','i','th','th','i','i','i','i','i','i','i','k','k','l','l','m','m','n','n','x','x','o','o','o','o','p','p','r','r','s','s','s','t','t','y','y','y','y','y','y','y','f','f','ch','ch','ps','ps','o','o','o','o'];
    $string = str_replace($greek, $latin, $string);
    $string = strtolower(trim($string));
    $string = preg_replace('/[^a-z0-9-]/', '-', $string);
    $string = preg_replace('/-+/', "-", $string);
    return trim($string, '-');
}

// Χειρισμός Μετακίνησης
if (isset($_GET['move']) && isset($_GET['id'])) {
    $move_id = (int)$_GET['id'];
    $direction = $_GET['move'];

    $all = $pdo->query("
        SELECT c1.id 
        FROM categories c1 
        LEFT JOIN categories c2 ON c1.parent_id = c2.id 
        ORDER BY c1.sort_order ASC, c2.name_el ASC, c1.name_el ASC
    ")->fetchAll(PDO::FETCH_ASSOC);
    
    $current_index = -1;
    $seq = 1;
    foreach ($all as $idx => $row) {
        $pdo->prepare("UPDATE categories SET sort_order = ? WHERE id = ?")->execute([$seq, $row['id']]);
        $all[$idx]['sort_order'] = $seq;
        if ($row['id'] == $move_id) { $current_index = $idx; }
        $seq++;
    }

    if ($current_index !== -1) {
        if ($direction === 'up' && $current_index > 0) {
            $prev_id = $all[$current_index - 1]['id'];
            $current_order = $all[$current_index]['sort_order'];
            $prev_order = $all[$current_index - 1]['sort_order'];
            
            $pdo->prepare("UPDATE categories SET sort_order = ? WHERE id = ?")->execute([$prev_order, $move_id]);
            $pdo->prepare("UPDATE categories SET sort_order = ? WHERE id = ?")->execute([$current_order, $prev_id]);
            
        } elseif ($direction === 'down' && $current_index < count($all) - 1) {
            $next_id = $all[$current_index + 1]['id'];
            $current_order = $all[$current_index]['sort_order'];
            $next_order = $all[$current_index + 1]['sort_order'];
            
            $pdo->prepare("UPDATE categories SET sort_order = ? WHERE id = ?")->execute([$next_order, $move_id]);
            $pdo->prepare("UPDATE categories SET sort_order = ? WHERE id = ?")->execute([$current_order, $next_id]);
        }
    }
    header("Location: categories.php");
    exit;
}

// Χειρισμός POST
if ($_SERVER['REQUEST_METHOD'] === 'POST' && isset($_POST['action'])) {
    $action = $_POST['action'];
    $name_el = trim($_POST['name_el']);
    $name_en = trim($_POST['name_en']);
    $parent_id = !empty($_POST['parent_id']) ? $_POST['parent_id'] : null;
    $attribute_group_id = !empty($_POST['attribute_group_id']) ? (int)$_POST['attribute_group_id'] : null;

    if (!empty($name_el)) {
        $slug_source = !empty($name_en) ? $name_en : $name_el;
        $slug = createSlug($slug_source);
        
        try {
            if ($action == 'add') {
                $stmt = $pdo->prepare("INSERT INTO categories (parent_id, name_el, name_en, slug, attribute_group_id, sort_order) VALUES (?, ?, ?, ?, ?, 999)");
                $stmt->execute([$parent_id, $name_el, $name_en, $slug, $attribute_group_id]);
                $message = "<div class='alert success'>{$t['msg_add_ok']}</div>";
            } elseif ($action == 'edit') {
                $category_id = (int)$_POST['category_id'];
                $stmt = $pdo->prepare("UPDATE categories SET parent_id = ?, name_el = ?, name_en = ?, slug = ?, attribute_group_id = ? WHERE id = ?");
                $stmt->execute([$parent_id, $name_el, $name_en, $slug, $attribute_group_id, $category_id]);
                $message = "<div class='alert success'>{$t['msg_edit_ok']}</div>";
            }
        } catch (PDOException $e) {
            $message = "<div class='alert error'>{$t['msg_err_slug']} " . $e->getMessage() . "</div>";
        }
    } else {
        $message = "<div class='alert error'>{$t['msg_err_name']}</div>";
    }
}

// Χειρισμός Διαγραφής
if (isset($_GET['delete'])) {
    $delete_id = (int)$_GET['delete'];
    
    $checkStmt = $pdo->prepare("SELECT COUNT(*) FROM products WHERE category_id = ?");
    $checkStmt->execute([$delete_id]);
    $hasProducts = $checkStmt->fetchColumn();

    $checkChild = $pdo->prepare("SELECT COUNT(*) FROM categories WHERE parent_id = ?");
    $checkChild->execute([$delete_id]);
    $hasChildren = $checkChild->fetchColumn();

    if ($hasProducts > 0) {
        $message = "<div class='alert error'>{$t['msg_err_prod']}</div>";
    } elseif ($hasChildren > 0) {
        $message = "<div class='alert error'>{$t['msg_err_child']}</div>";
    } else {
        try {
            $stmt = $pdo->prepare("DELETE FROM categories WHERE id = ?");
            $stmt->execute([$delete_id]);
            $message = "<div class='alert success'>{$t['msg_del_ok']}</div>";
        } catch (PDOException $e) {
            $message = "<div class='alert error'>Σφάλμα: " . $e->getMessage() . "</div>";
        }
    }
}

$edit_category = null;
if (isset($_GET['edit'])) {
    $edit_id = (int)$_GET['edit'];
    $editStmt = $pdo->prepare("SELECT * FROM categories WHERE id = ?");
    $editStmt->execute([$edit_id]);
    $edit_category = $editStmt->fetch();
}

$stmt = $pdo->query("
    SELECT c1.id, c1.parent_id, c1.name_el, c1.name_en, c1.slug, c1.sort_order, ag.name as group_name
    FROM categories c1 
    LEFT JOIN attribute_groups ag ON c1.attribute_group_id = ag.id
    ORDER BY c1.sort_order ASC, c1.name_el ASC
");
$all_categories = $stmt->fetchAll(PDO::FETCH_ASSOC);

function buildCategoryTree($categories, $parentId = null) {
    $branch = [];
    foreach ($categories as $cat) {
        if ($cat['parent_id'] == $parentId) {
            $children = buildCategoryTree($categories, $cat['id']);
            if ($children) {
                $cat['children'] = $children;
            }
            $branch[] = $cat;
        }
    }
    return $branch;
}

$categoryTree = buildCategoryTree($all_categories);

function renderTreeHTML($tree, $level = 0, $t) {
    $html = '<ul class="' . ($level === 0 ? 'tree-root' : 'tree-branch') . '">';
    foreach ($tree as $node) {
        $padding = $level * 35; 
        $html .= '<li class="tree-node">';
        $html .= '<div class="tree-row" style="padding-left: ' . ($padding + 15) . 'px;">';
        
        if ($level > 0) {
            $html .= '<span class="tree-line"></span>';
        }

        $html .= '<div class="tree-arrows">';
        $html .= '<a href="categories.php?move=up&id='.$node['id'].'">▲</a>';
        $html .= '<a href="categories.php?move=down&id='.$node['id'].'">▼</a>';
        $html .= '</div>';

        $html .= '<div class="tree-info">';
        $html .= '<strong>' . htmlspecialchars($node['name_el']) . '</strong>';
        if (!empty($node['name_en'])) {
            $html .= ' <span class="tree-en">(' . htmlspecialchars($node['name_en']) . ')</span>';
        }
        $html .= ' <span class="tree-slug">/' . htmlspecialchars($node['slug']) . '</span>';
        if (!empty($node['group_name'])) {
            $html .= ' <span class="tree-badge">' . htmlspecialchars($node['group_name']) . '</span>';
        }
        $html .= '</div>';

        $html .= '<div class="tree-actions">';
        $html .= '<a href="categories.php?edit='.$node['id'].'" class="action-link action-edit">Edit</a>';
        $html .= '<a href="categories.php?delete='.$node['id'].'" class="action-link action-delete" onclick="return confirm(\''.$t['confirm_del'].'\');">Delete</a>';
        $html .= '</div>';
        $html .= '</div>';

        if (!empty($node['children'])) {
            $html .= renderTreeHTML($node['children'], $level + 1, $t);
        }

        $html .= '</li>';
    }
    $html .= '</ul>';
    return $html;
}

$stmtParents = $pdo->query("SELECT id, name_el FROM categories WHERE parent_id IS NULL ORDER BY sort_order ASC, name_el ASC");
$parentCategories = $stmtParents->fetchAll();

$attrGroups = $pdo->query("SELECT id, name FROM attribute_groups ORDER BY name")->fetchAll();
?>
<!DOCTYPE html>
<html lang="<?php echo $current_lang; ?>">
<head>
    <meta charset="UTF-8">
    <title><?php echo $t['manage_cats']; ?> - Hockey CMS</title>
    <link href="https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap" rel="stylesheet">
    <style>
        :root {
            --primary: #f97316;
            --primary-hover: #ea580c;
            --bg-color: #0b1120;
            --panel-bg: #1e293b;
            --border-color: #334155;
            --text-main: #f8fafc;
            --text-muted: #94a3b8;
        }
        body { font-family: 'Inter', sans-serif; background-color: var(--bg-color); color: var(--text-main); margin: 0; }
        .content { margin-left: 250px; padding: 30px; }
        .content h2 { margin-top: 0; color: var(--primary); font-size: 26px; text-transform: uppercase; letter-spacing: 0.5px; }
        
        .card { background: var(--panel-bg); padding: 25px; border-radius: 8px; box-shadow: 0 4px 6px -1px rgba(0,0,0,0.3); border: 1px solid var(--border-color); margin-bottom: 25px; }
        .card h3 { margin-top: 0; color: var(--text-main); border-bottom: 1px solid rgba(255,255,255,0.05); padding-bottom: 15px; font-size: 18px; text-transform: uppercase; letter-spacing: 0.5px; }
        
        .form-group { margin-bottom: 20px; }
        .form-group label { display: block; margin-bottom: 8px; font-weight: 700; font-size: 13px; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.5px;}
        .form-group input, .form-group select { width: 100%; padding: 12px; background: #0f172a; border: 1px solid var(--border-color); color: var(--text-main); border-radius: 6px; box-sizing: border-box; font-family: 'Inter', sans-serif; outline: none; transition: 0.2s; }
        .form-group input:focus, .form-group select:focus { border-color: var(--primary); box-shadow: 0 0 0 2px rgba(249, 115, 22, 0.2); }
        
        .btn { padding: 12px 20px; background: var(--primary); color: white; border: none; border-radius: 6px; cursor: pointer; font-weight: 800; font-size: 14px; text-transform: uppercase; transition: 0.2s; }
        .btn:hover { background: var(--primary-hover); transform: translateY(-1px); }
        .btn-cancel { background: rgba(255,255,255,0.05); color: var(--text-main); padding: 12px 20px; text-decoration: none; border-radius: 6px; display: inline-block; font-weight: 700; border: 1px solid var(--border-color); text-transform: uppercase; transition: 0.2s;}
        .btn-cancel:hover { background: rgba(255,255,255,0.1); }
        
        .alert { padding: 15px; border-radius: 6px; margin-bottom: 20px; font-weight: 600; font-size: 14px;}
        .success { background: rgba(16, 185, 129, 0.1); color: #10b981; border: 1px solid rgba(16, 185, 129, 0.2); }
        .error { background: rgba(239, 68, 68, 0.1); color: #ef4444; border: 1px solid rgba(239, 68, 68, 0.2); }
        
        /* --- DARK TREEVIEW STYLES --- */
        .tree-root { list-style: none; padding: 0; margin: 0; border: 1px solid var(--border-color); border-radius: 6px; overflow: hidden; }
        .tree-branch { list-style: none; padding: 0; margin: 0; }
        .tree-node { border-bottom: 1px solid rgba(255,255,255,0.05); }
        .tree-node:last-child { border-bottom: none; }
        
        .tree-row { display: flex; align-items: center; padding: 15px; background: var(--panel-bg); transition: 0.2s; position: relative; }
        .tree-row:hover { background: rgba(255,255,255,0.02); }
        
        .tree-line { display: inline-block; width: 15px; height: 15px; border-left: 2px solid var(--border-color); border-bottom: 2px solid var(--border-color); margin-right: 15px; margin-top: -10px; }
        
        .tree-arrows { display: flex; flex-direction: column; margin-right: 15px; gap: 3px; }
        .tree-arrows a { text-decoration: none; color: var(--text-muted); font-size: 10px; background: #0f172a; padding: 3px 6px; border-radius: 4px; line-height: 1; border: 1px solid var(--border-color); transition: 0.2s;}
        .tree-arrows a:hover { background: var(--primary); color: white; border-color: var(--primary); }
        
        .tree-info { flex-grow: 1; }
        .tree-info strong { color: var(--text-main); font-size: 15px; }
        .tree-en { color: var(--text-muted); font-size: 13px; font-weight: 500;}
        .tree-slug { color: #3b82f6; font-size: 12px; margin-left: 10px; font-family: monospace;}
        .tree-badge { background: rgba(0,0,0,0.3); color: var(--text-muted); padding: 4px 10px; border-radius: 12px; font-size: 11px; font-weight: 700; margin-left: 10px; border: 1px solid var(--border-color); text-transform: uppercase;}
        
        .tree-actions { flex-shrink: 0; }
        .action-link { padding: 6px 12px; text-decoration: none; border-radius: 4px; font-size: 12px; margin-left: 5px; display: inline-block; font-weight: 700; text-transform: uppercase; transition: 0.2s;}
        .action-edit { background-color: rgba(249, 115, 22, 0.1); color: var(--primary); border: 1px solid rgba(249, 115, 22, 0.2); }
        .action-edit:hover { background-color: var(--primary); color: white; }
        .action-delete { background-color: rgba(239, 68, 68, 0.1); color: #ef4444; border: 1px solid rgba(239, 68, 68, 0.2); }
        .action-delete:hover { background-color: #ef4444; color: white; }
    </style>
</head>
<body>
    
    <?php include 'sidebar.php'; ?>

    <div class="content">
        <h2><?php echo $t['manage_cats']; ?></h2>
        <?php echo $message; ?>

        <div class="card">
            <h3><?php echo $edit_category ? $t['edit_cat'] : $t['add_cat']; ?></h3>
            <form method="POST" action="categories.php">
                <input type="hidden" name="action" value="<?php echo $edit_category ? 'edit' : 'add'; ?>">
                <?php if ($edit_category): ?>
                    <input type="hidden" name="category_id" value="<?php echo $edit_category['id']; ?>">
                <?php endif; ?>
                
                <div style="display: grid; grid-template-columns: 1fr 1fr; gap: 20px;">
                    <div class="form-group">
                        <label><?php echo $t['name_el']; ?></label>
                        <input type="text" name="name_el" value="<?php echo $edit_category ? htmlspecialchars($edit_category['name_el']) : ''; ?>" required>
                    </div>
                    <div class="form-group">
                        <label><?php echo $t['name_en']; ?></label>
                        <input type="text" name="name_en" value="<?php echo $edit_category ? htmlspecialchars($edit_category['name_en'] ?? '') : ''; ?>">
                    </div>
                </div>
                
                <div style="display: grid; grid-template-columns: 1fr 1fr; gap: 20px;">
                    <div class="form-group">
                        <label><?php echo $t['parent_cat']; ?></label>
                        <select name="parent_id">
                            <option value=""><?php echo $t['is_main']; ?></option>
                            <?php foreach($parentCategories as $parent): ?>
                                <?php if (!$edit_category || $edit_category['id'] != $parent['id']): ?>
                                    <option value="<?php echo $parent['id']; ?>" <?php echo ($edit_category && $edit_category['parent_id'] == $parent['id']) ? 'selected' : ''; ?>>
                                        <?php echo htmlspecialchars($parent['name_el']); ?>
                                    </option>
                                <?php endif; ?>
                            <?php endforeach; ?>
                        </select>
                    </div>

                    <div class="form-group">
                        <label><?php echo $t['attr_group']; ?></label>
                        <select name="attribute_group_id">
                            <option value=""><?php echo $t['no_attr']; ?></option>
                            <?php foreach($attrGroups as $group): ?>
                                <option value="<?php echo $group['id']; ?>" <?php echo ($edit_category && $edit_category['attribute_group_id'] == $group['id']) ? 'selected' : ''; ?>>
                                    <?php echo htmlspecialchars($group['name']); ?>
                                </option>
                            <?php endforeach; ?>
                        </select>
                    </div>
                </div>
                
                <button type="submit" class="btn"><?php echo $edit_category ? $t['btn_save'] : $t['btn_add']; ?></button>
                <?php if ($edit_category): ?>
                    <a href="categories.php" class="btn-cancel"><?php echo $t['btn_cancel']; ?></a>
                <?php endif; ?>
            </form>
        </div>

        <div class="card">
            <h3>📂 <?php echo $t['tree_title']; ?></h3>
            <?php 
                if (!empty($categoryTree)) {
                    echo renderTreeHTML($categoryTree, 0, $t); 
                } else {
                    echo "<p style='color: var(--text-muted); padding: 20px; text-align: center;'>{$t['no_cats']}</p>";
                }
            ?>
        </div>
    </div>

</body>
</html>