<?php
error_reporting(E_ERROR | E_PARSE | E_CORE_ERROR | E_COMPILE_ERROR);
ini_set('display_errors', 1);
ini_set('display_startup_errors', 1);

session_start();
$currDir = __DIR__;
$rootDir = dirname(dirname(dirname($currDir)));
$mysydeDir = $rootDir . '/mysyde';

require_once($rootDir . '/vendor/autoload.php');
require_once($rootDir . "/mysyde/frontend/frontend_functions.inc.php");

$envDir = $rootDir . '/config';
$envFilePath = $envDir . '/.env';
if (is_dir($envDir) && file_exists($envFilePath) && is_file($envFilePath) && is_readable($envFilePath)) {
    $dotenv = new \Dotenv\Dotenv($envDir);
    $dotenv->load();
}
$common = $mysydeDir . "/common/common_functions.inc.php";
require_once($common);

$connEnv = (local_environment()) ? $mysydeDir . "/dc.config.php" : $mysydeDir . "/dc-server.config.php";

require_once($connEnv);

db_connect();

function parse_ids_list(?string $csv): array
{
    if ($csv === null)
        return [];
    $csv = trim($csv);
    if ($csv === '')
        return [];

    $parts = explode(',', $csv);
    $out = [];
    foreach ($parts as $p) {
        $p = trim($p);
        if ($p === '')
            continue;
        if (ctype_digit($p))
            $out[] = (int) $p;
    }
    $out = array_values(array_unique($out));
    return $out;
}

function build_user_pairs(array $contact_rows): array
{
    $pairs = [];
    foreach ($contact_rows as $row) {
        $m = $row['main_mandant_id'] ?? null;
        $d = $row['main_department_id'] ?? null;
        if ($m === null || $d === null)
            continue;
        if (!is_numeric($m) || !is_numeric($d))
            continue;
        $pairs[((int) $m) . ':' . ((int) $d)] = true;
    }
    return $pairs; // associative set
}

function user_can_see_ticket(int $contact_id, array $user_pairs, array $ticket): bool
{

    $contact_ids = parse_ids_list($ticket['contact_ids'] ?? null);
    $mandant_ids = parse_ids_list($ticket['mandant_ids'] ?? null);
    $department_ids = parse_ids_list($ticket['department_ids'] ?? null);

    if (!empty($contact_ids) && in_array($contact_id, $contact_ids, true)) {
        return true;
    }

    $mandant_unrestricted = empty($mandant_ids);     
    $department_unrestricted = empty($department_ids);

    if ($mandant_unrestricted && $department_unrestricted) {
        return true;
    }

    if (!$mandant_unrestricted && $department_unrestricted) {
        foreach ($user_pairs as $pairKey => $_) {
            [$um, $ud] = array_map('intval', explode(':', $pairKey, 2));
            if (in_array($um, $mandant_ids, true))
                return true;
        }
        return false;
    }

    if ($mandant_unrestricted && !$department_unrestricted) {
        foreach ($user_pairs as $pairKey => $_) {
            [$um, $ud] = array_map('intval', explode(':', $pairKey, 2));
            if (in_array($ud, $department_ids, true))
                return true;
        }
        return false;
    }


    foreach ($mandant_ids as $m) {
        foreach ($department_ids as $d) {
            if (isset($user_pairs[$m . ':' . $d])) {
                return true;
            }
        }
    }

    return false;
}

function filter_tickets_for_user(int $contact_id, array $contact_rows, array $tickets): array
{
    $user_pairs = build_user_pairs($contact_rows);

    $out = [];
    foreach ($tickets as $ticket) {
        if (user_can_see_ticket($contact_id, $user_pairs, $ticket)) {
            $out[] = $ticket;
        }
    }
    return $out;
}

$json = file_get_contents('php://input');
$data = json_decode($json, true);

switch ($data['action']) {
    case 'get_tickets':
        get_tickets($data);
        break;
    case 'getSubCategories':
        get_sub_categories($data);
        break;
    case 'getParendCategories':
        get_parent_categories($data);
        break;
    case 'getCategorieInfo':
        get_categorie_info($data);
        break;
    default:
        echo json_encode(['error' => 'Invalid action']);
        break;
}

function get_categorie_info($data)
{
    $category_id = $data['category_id'] ?? '';

    $query = "SELECT id, description, text FROM main_tickets_category WHERE id = :category_id";
    $stmt = $GLOBALS['pdo_conn']->prepare($query);
    $stmt->bindParam(':category_id', $category_id);
    $stmt->execute();
    $category_info = $stmt->fetch(PDO::FETCH_ASSOC);

    echo json_encode($category_info);
}
function get_parent_categories($data)
{
    $query = "SELECT id, description, text FROM main_tickets_category WHERE parent_id IS NULL ORDER BY sorting";
    $stmt = $GLOBALS['pdo_conn']->prepare($query);
    $stmt->execute();
    $parent_categories = $stmt->fetchAll(PDO::FETCH_ASSOC);

    echo json_encode($parent_categories);
}

function get_sub_categories($data)
{
    $category_id = $data['category_id'] ?? '';

    $query = "SELECT id, description, text FROM main_tickets_category WHERE parent_id = :category_id ORDER BY sorting";
    $stmt = $GLOBALS['pdo_conn']->prepare($query);
    $stmt->bindParam(':category_id', $category_id);
    $stmt->execute();
    $sub_categories = $stmt->fetchAll(PDO::FETCH_ASSOC);

    echo json_encode($sub_categories);
}

function get_tickets($data)
{

    $cue = $data['cue'] ?? '';
    $contact_id = $data['contactID'] ?? '';

    $query = "SELECT 
    
        main_contact.id AS contact_id,
        main_contact_department.main_mandant_id,
        main_contact_department.main_department_id,
        main_contact_department.main_role_id,
        main_contact_department.main_bereich_id,
        main_contact_department.main_einricht_id

        FROM main_contact 

        LEFT JOIN main_contact_department AS main_contact_department ON main_contact_department.main_contact_id = main_contact.id

        WHERE main_contact.id = :contact_id
    ";

    $stmt = $GLOBALS['pdo_conn']->prepare($query);
    $stmt->bindParam(':contact_id', $contact_id);
    $stmt->execute();
    $contact_rows = $stmt->fetchAll(PDO::FETCH_ASSOC);

    switch ($cue) {
        case '1000':
            $where = "WHERE main_tickets.sender_id = :contact_id 
                            AND current_state != 4";
            break;
        case '2000':
            $where = "WHERE main_tickets.receiver_id = :contact_id 
                            AND current_state != 4";
            break;
        case '3000':
            $where = "WHERE current_state != 4";
            break;
        case '4000':
            $where = "WHERE main_tickets.current_state = 4";
            break;
        case '6000':
            $where = "";
            break;
        case '7000':
            $where = "WHERE main_tickets.receiver_id = 0";
            break;
        case '8000':
            $where = "WHERE main_tickets.insurance_claim = 1";
            break;
        default:
            $where = "";
            break;
    }


    $query = "SELECT 

        main_tickets.id,
        main_tickets.id AS 'ticket_no',
        main_tickets.description,
        main_tickets.creation_date,
        receiver.name AS 'receiver',
        sender.name AS 'sender',
        main_tickets_category.description AS 'category_description',
        individual_state.description AS 'individual_state_description',

        GROUP_CONCAT(DISTINCT main_tickets_category_mandant.main_mandant_id) AS mandant_ids,
        GROUP_CONCAT(DISTINCT main_tickets_category_department.main_department_id) AS department_ids,
        GROUP_CONCAT(DISTINCT main_tickets_category_contact.main_contact_id) AS contact_ids

        FROM main_tickets 
        LEFT JOIN main_contact AS receiver ON receiver.id = main_tickets.receiver_id 
        LEFT JOIN main_contact AS sender ON sender.id = main_tickets.sender_id
        LEFT JOIN main_tickets_category ON main_tickets.main_ticket_category_id = main_tickets_category.id 
        LEFT JOIN main_tickets_status AS individual_state ON individual_state.id = main_tickets.individual_state
        
        LEFT JOIN main_tickets_category_mandant AS main_tickets_category_mandant ON main_tickets_category_mandant.main_tickets_category_id = main_tickets.main_ticket_category_id
        LEFT JOIN main_tickets_category_department AS main_tickets_category_department ON main_tickets_category_department.main_tickets_category_id = main_tickets.main_ticket_category_id
        LEFT JOIN main_tickets_category_contact AS main_tickets_category_contact ON main_tickets_category_contact.main_tickets_category_id = main_tickets.main_ticket_category_id

        $where

        GROUP BY main_tickets.id
    ";

    $stmt = $GLOBALS['pdo_conn']->prepare($query);
    switch ($cue) {
        case '1000':
            $stmt->bindParam(':contact_id', $contact_id, PDO::PARAM_INT);
            break;
        case '2000':
            $stmt->bindParam(':contact_id', $contact_id, PDO::PARAM_INT);
            break;
        case '3000':
            break;
        case '4000':
            break;
        case '5000':
            break;
        case '6000':
            break;
        case '7000':
            break;
        default:

            break;
    }

    $stmt->execute();
    $tickets = $stmt->fetchAll(PDO::FETCH_ASSOC);

    $contact_id_int = (int) $contact_id;

    switch ($cue) {
        case '1000':
            break;
        case '2000':
            break;
        case '3000':
            $tickets = filter_tickets_for_user($contact_id_int, $contact_rows, $tickets);
            break;
        case '4000':
            $tickets = filter_tickets_for_user($contact_id_int, $contact_rows, $tickets);
            break;
        case '5000':
            break;
        case '6000':
            break;
        case '7000':
            break;
        default:

            break;
    }

    $tickets = array_map(function ($ticket) {
        $ticket['id'] = encryptId($ticket['id']);
        return $ticket;
    }, $tickets);

    echo json_encode($tickets);
}