<?php
define('NOTOKENRENEWAL', 1);
require '../../../main.inc.php';

$section_id = GETPOST('section_id', 'int');
$direction = GETPOST('direction', 'alpha');

if (!$section_id || !$direction) {
    echo json_encode(array('success' => false, 'error' => 'Missing parameters'));
    exit;
}

// Hole Section-Info
$sql = "SELECT fk_facture FROM ".MAIN_DB_PREFIX."facture_lines_manager";
$sql .= " WHERE rowid = ".(int)$section_id;
$sql .= " AND line_type = 'section'";
$resql = $db->query($sql);

if (!$resql || $db->num_rows($resql) == 0) {
    echo json_encode(array('success' => false, 'error' => 'Section not found'));
    exit;
}

$section = $db->fetch_object($resql);
$facture_id = $section->fk_facture;

$db->begin();

// 1. Hole alle Sections (sortiert)
$sql = "SELECT rowid FROM ".MAIN_DB_PREFIX."facture_lines_manager";
$sql .= " WHERE fk_facture = ".(int)$facture_id;
$sql .= " AND line_type = 'section'";
$sql .= " ORDER BY line_order";
$resql = $db->query($sql);

$sections = array();
while ($obj = $db->fetch_object($resql)) {
    $sections[] = $obj->rowid;
}

// 2. Finde Index und tausche
$current_index = array_search($section_id, $sections);

if ($current_index === false) {
    echo json_encode(array('success' => false, 'error' => 'Section not in list'));
    exit;
}

if ($direction == 'up') {
    if ($current_index == 0) {
        echo json_encode(array('success' => false, 'error' => 'Already at top'));
        exit;
    }
    $swap_index = $current_index - 1;
} else {
    if ($current_index == count($sections) - 1) {
        echo json_encode(array('success' => false, 'error' => 'Already at bottom'));
        exit;
    }
    $swap_index = $current_index + 1;
}

// Tausche
$temp = $sections[$current_index];
$sections[$current_index] = $sections[$swap_index];
$sections[$swap_index] = $temp;

// 3. Baue komplette neue Reihenfolge auf
$new_order = 1;
$updates = array();

// Freie Produkte zuerst
$sql = "SELECT rowid FROM ".MAIN_DB_PREFIX."facture_lines_manager";
$sql .= " WHERE fk_facture = ".(int)$facture_id;
$sql .= " AND line_type = 'product'";
$sql .= " AND parent_section IS NULL";
$sql .= " ORDER BY line_order";
$resql = $db->query($sql);

while ($obj = $db->fetch_object($resql)) {
    $updates[$obj->rowid] = $new_order;
    $new_order++;
}

// Freie Textzeilen
$sql = "SELECT rowid FROM ".MAIN_DB_PREFIX."facture_lines_manager";
$sql .= " WHERE fk_facture = ".(int)$facture_id;
$sql .= " AND line_type = 'text'";
$sql .= " AND parent_section IS NULL";
$sql .= " ORDER BY line_order";
$resql = $db->query($sql);

while ($obj = $db->fetch_object($resql)) {
    $updates[$obj->rowid] = $new_order;
    $new_order++;
}

// Sections in neuer Reihenfolge
foreach ($sections as $sec_id) {
    // Section-Header
    $updates[$sec_id] = $new_order;
    $new_order++;
    
    // Produkte dieser Section
    $sql = "SELECT rowid FROM ".MAIN_DB_PREFIX."facture_lines_manager";
    $sql .= " WHERE fk_facture = ".(int)$facture_id;
    $sql .= " AND line_type = 'product'";
    $sql .= " AND parent_section = ".(int)$sec_id;
    $sql .= " ORDER BY line_order";
    $resql = $db->query($sql);
    
    while ($obj = $db->fetch_object($resql)) {
        $updates[$obj->rowid] = $new_order;
        $new_order++;
    }
    
    // Textzeilen dieser Section
    $sql = "SELECT rowid FROM ".MAIN_DB_PREFIX."facture_lines_manager";
    $sql .= " WHERE fk_facture = ".(int)$facture_id;
    $sql .= " AND line_type = 'text'";
    $sql .= " AND parent_section = ".(int)$sec_id;
    $sql .= " ORDER BY line_order";
    $resql = $db->query($sql);
    
    while ($obj = $db->fetch_object($resql)) {
        $updates[$obj->rowid] = $new_order;
        $new_order++;
    }
    
    // ========== SUBTOTAL DIESER SECTION ==========
    $sql = "SELECT rowid FROM ".MAIN_DB_PREFIX."facture_lines_manager";
    $sql .= " WHERE fk_facture = ".(int)$facture_id;
    $sql .= " AND line_type = 'subtotal'";
    $sql .= " AND parent_section = ".(int)$sec_id;
    $resql = $db->query($sql);
    
    while ($obj = $db->fetch_object($resql)) {
        $updates[$obj->rowid] = $new_order;
        $new_order++;
    }
}

// 4. Führe alle Updates aus
foreach ($updates as $rowid => $order) {
    $sql = "UPDATE ".MAIN_DB_PREFIX."facture_lines_manager";
    $sql .= " SET line_order = ".(int)$order;
    $sql .= " WHERE rowid = ".(int)$rowid;
    $db->query($sql);
}

// 5. Sync rang
$sql = "SELECT fk_facturedet FROM ".MAIN_DB_PREFIX."facture_lines_manager";
$sql .= " WHERE fk_facture = ".(int)$facture_id;
$sql .= " AND line_type = 'product'";
$sql .= " ORDER BY line_order";
$resql = $db->query($sql);

$rang = 1;
while ($obj = $db->fetch_object($resql)) {
    $sql_upd = "UPDATE ".MAIN_DB_PREFIX."facturedet";
    $sql_upd .= " SET rang = ".$rang;
    $sql_upd .= " WHERE rowid = ".(int)$obj->fk_facturedet;
    $db->query($sql_upd);
    $rang++;
}

$db->commit();

echo json_encode(array('success' => true));