<?php
if (!defined('ABSPATH')) exit;

class WMF_Form_Processor {
    private static $instance=null;
    public static function instance() {
        if(is_null(self::$instance)){self::$instance=new self();self::$instance->hook();}
        return self::$instance;
    }
    public function hook() {
        add_action('init',array($this,'maybe_process'),20);
    }
    public function maybe_process() {
        if(empty($_POST['wmf_action'])||$_POST['wmf_action']!=='submit') return;
        if(empty($_POST['wmf_form_id'])) return;
        if(!session_id()) session_start();

        $form_id=intval($_POST['wmf_form_id']);
        if(!wp_verify_nonce($_POST['wmf_nonce']??'','wmf_submit_'.$form_id)) {
            $this->fail($form_id,'Sicherheitsüberprüfung fehlgeschlagen.'); return;
        }
        $form=get_post($form_id);
        if(!$form||$form->post_type!=='wmf-form') return;

        $meta   = wmf_get_form_meta($form_id);
        $fields = $meta['fields']??array();

        // Honeypot prüfen
        if(!empty($meta['honeypot_enabled'])&&$meta['honeypot_enabled']==='1') {
            if(!empty($_POST['wmf_hp_'.md5($form_id)])) { $this->ok($form_id,$meta); return; } // stille Ablehnung
        }

        // Werte sammeln + validieren
        $values=array(); $errors=array();
        foreach($fields as $field) {
            $type=$field['type']??'';
            $obj=wmf_get_field($type);
            if(!$obj) continue;
            if(in_array($type,array('html','divider'))) continue;

            $raw=$_POST['wmf_fields'][$field['id']]??'';
            $val=$obj->sanitize($raw,$field);
            $valid=$obj->validate($val,$field);
            $values[$field['id']]=$val;
            if($valid!==true) $errors[$field['id']]=$valid;
        }

        // Datei-Uploads
        $file_values=array();
        if(!empty($_FILES['wmf_files'])) {
            foreach($fields as $field) {
                if(($field['type']??'')!=='file') continue;
                $uploaded=WMF_Field_File::handle_upload($field,$form_id);
                if(!empty($uploaded)) $file_values[$field['id']]=$uploaded;
                // Validierung nochmal mit Upload-Ergebnis
                $valid=wmf_get_field('file')->validate('',$field);
                if($valid!==true&&!isset($errors[$field['id']])) $errors[$field['id']]=$valid;
            }
        }

        if(!empty($errors)) {
            $_SESSION['wmf_values_'.$form_id]=$values;
            $_SESSION['wmf_errors_'.$form_id]=$errors;
            wp_redirect($this->current_url()); exit;
        }

        // Datei-URLs in Werte mergen
        foreach($file_values as $fid=>$uploads) {
            $urls=array_map(fn($u)=>$u['url'],$uploads);
            $values[$fid]=implode(', ',$urls);
        }

        // Speichern
        $submission_id=null;
        if(!empty($meta['save_submissions'])&&$meta['save_submissions']==='1') {
            $submission_id=WMF_Submission::save($form_id,$values);
        }

        // E-Mails
        if(!empty($meta['notify_admin'])&&$meta['notify_admin']==='1') {
            WMF_Mailer::notify_admin($form_id,$meta,$fields,$values,$file_values);
        }
        if(!empty($meta['notify_sender'])&&$meta['notify_sender']==='1') {
            WMF_Mailer::notify_sender($form_id,$meta,$fields,$values);
        }

        do_action('wmf_form_submitted',$form_id,$meta,$fields,$values,$submission_id);
        $this->ok($form_id,$meta);
    }

    private function ok($form_id,$meta) {
        if(!empty($meta['redirect_url'])) { wp_redirect(esc_url_raw($meta['redirect_url'])); exit; }
        if(!session_id()) session_start();
        $_SESSION['wmf_success_'.$form_id]=true;
        wp_redirect($this->current_url()); exit;
    }
    private function fail($form_id,$msg) {
        if(!session_id()) session_start();
        $_SESSION['wmf_errors_'.$form_id]=array('_global'=>$msg);
        wp_redirect($this->current_url()); exit;
    }
    private function current_url() {
        return (is_ssl()?'https':'http').'://'.$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI'];
    }
}