<?php
// xml_manager.php
require_once 'config.php';

class XMLManager
{
    private $xml_file;
    private $xml;

    public function __construct($xml_file = XML_FILE)
    {
        $this->xml_file = $xml_file;
        if (file_exists($xml_file)) {
            $this->xml = simplexml_load_file($xml_file);
        } else {
            // Create basic XML structure
            $this->xml = new SimpleXMLElement('<?xml version="1.0" encoding="UTF-8"?><areas></areas>');
// Add default areas
$delhi = $this->xml->addChild('area');
$delhi->addAttribute('name', 'Delhi');
$delhi->addAttribute('slug', 'delhi');
$delhi->addAttribute('phone', '911234567890');
$delhi->addAttribute('email', 'info@delhigal.com');
$delhi->addAttribute('priority', '1');

$ncr = $this->xml->addChild('area');
$ncr->addAttribute('name', 'NCR');
$ncr->addAttribute('slug', 'ncr');
$ncr->addAttribute('phone', '911234567891');
$ncr->addAttribute('email', 'info@delhigal.com');
$ncr->addAttribute('priority', '1');

$this->saveXML();
}
}

public function addArea($parent_slug, $name, $slug, $phone, $email, $priority)
{
$parent = $this->findAreaNode($this->xml, $parent_slug);
if ($parent) {
$new_area = $parent->addChild('area');
$new_area->addAttribute('name', htmlspecialchars($name));
$new_area->addAttribute('slug', htmlspecialchars($slug));
$new_area->addAttribute('phone', htmlspecialchars($phone));
$new_area->addAttribute('email', htmlspecialchars($email));
$new_area->addAttribute('priority', htmlspecialchars($priority));

return $this->saveXML();
}
return false;
}

public function editArea($slug, $name, $phone, $email, $priority)
{
$area = $this->findAreaNode($this->xml, $slug);
if ($area) {
$area['name'] = htmlspecialchars($name);
$area['phone'] = htmlspecialchars($phone);
$area['email'] = htmlspecialchars($email);
$area['priority'] = htmlspecialchars($priority);

return $this->saveXML();
}
return false;
}

public function deleteArea($slug)
{
$area = $this->findAreaNode($this->xml, $slug);
if ($area && $this->hasChildren($area)) {
throw new Exception("Cannot delete area that has child areas! Please delete child areas first.");
}

if (in_array($slug, ['delhi', 'ncr'])) {
throw new Exception("Cannot delete root areas!");
}

if ($this->deleteAreaRecursive($this->xml, $slug)) {
return $this->saveXML();
} else {
throw new Exception("Area not found or cannot be deleted!");
}
}

public function getAllAreas()
{
$areas = [];
$this->getAllAreasRecursive($this->xml, $areas);
return $areas;
}

public function findAreaBySlug($slug)
{
return $this->findAreaNode($this->xml, $slug);
}

// Private helper methods
private function findAreaNode($xml, $slug, &$parent = null)
{
foreach ($xml->area as $area) {
$attributes = $area->attributes();
if ((string)$attributes['slug'] === $slug) {
return $area;
}
if ($area->area && $area->area->count() > 0) {
$found = $this->findAreaNode($area, $slug, $parent);
if ($found) {
if (!$parent) $parent = $area;
return $found;
}
}
}
return null;
}

private function hasChildren($area)
{
return $area->area && $area->area->count() > 0;
}

private function deleteAreaRecursive($xml, $slug)
{
foreach ($xml->area as $area) {
$attributes = $area->attributes();
if ((string)$attributes['slug'] === $slug) {
$dom = dom_import_simplexml($area);
$dom->parentNode->removeChild($dom);
return true;
}
if ($area->area && $area->area->count() > 0) {
if ($this->deleteAreaRecursive($area, $slug)) {
return true;
}
}
}
return false;
}

private function getAllAreasRecursive($xml, &$areas = [], $level = 0)
{
foreach ($xml->area as $area) {
$attributes = $area->attributes();
$prefix = str_repeat('-- ', $level);
$areas[(string)$attributes['slug']] = [
'name' => $prefix . (string)$attributes['name'],
'has_children' => $this->hasChildren($area),
'node' => $area
];
if ($area->area && $area->area->count() > 0) {
$this->getAllAreasRecursive($area, $areas, $level + 1);
}
}
}

private function saveXML()
{
$dom = new DOMDocument('1.0');
$dom->preserveWhiteSpace = false;
$dom->formatOutput = true;
$dom->loadXML($this->xml->asXML());
return file_put_contents($this->xml_file, $dom->saveXML()) !== false;
}
}