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

function wmf_create_submissions_table() {
    global $wpdb;
    $table   = $wpdb->prefix . 'wmf_submissions';
    $charset = $wpdb->get_charset_collate();
    $sql = "CREATE TABLE IF NOT EXISTS {$table} (
        id          BIGINT(20) UNSIGNED NOT NULL AUTO_INCREMENT,
        form_id     BIGINT(20) UNSIGNED NOT NULL,
        data        LONGTEXT NOT NULL,
        ip          VARCHAR(45) DEFAULT '',
        user_agent  TEXT DEFAULT '',
        status      VARCHAR(20) DEFAULT 'neu',
        created_at  DATETIME DEFAULT CURRENT_TIMESTAMP,
        PRIMARY KEY (id),
        KEY form_id (form_id)
    ) {$charset};";
    require_once ABSPATH . 'wp-admin/includes/upgrade.php';
    dbDelta( $sql );
    update_option( 'wmf_db_version', '2.0' );
}

function wmf_get_fields()          { return WMF_Field_Registry::instance()->get_fields(); }
function wmf_get_field( $type )    { return WMF_Field_Registry::instance()->get_field( $type ); }
function wmf_get_shortcode( $id )  { return '[wp_multi_formular id="' . intval($id) . '"]'; }
function wmf_unique_id()           { return 'field_' . substr( md5( uniqid( '', true ) ), 0, 8 ); }

function wmf_get_form_meta( $form_id ) {
    $defaults = array(
        'fields'               => array(),
        'submit_label'         => 'Absenden',
        'success_message'      => 'Vielen Dank! Ihre Nachricht wurde gesendet.',
        'error_message'        => 'Es ist ein Fehler aufgetreten. Bitte versuchen Sie es erneut.',
        'notify_admin'         => '1',
        'admin_email'          => get_option('admin_email'),
        'admin_subject'        => 'Neue Formulareinreichung',
        'admin_reply_to'       => '1',
        'notify_sender'        => '0',
        'sender_subject'       => 'Ihre Nachricht wurde empfangen',
        'sender_message'       => 'Vielen Dank für Ihre Nachricht. Wir melden uns bald.',
        'from_name'            => get_bloginfo('name'),
        'from_email'           => get_option('admin_email'),
        'save_submissions'     => '1',
        'recaptcha_enabled'    => '0',
        'honeypot_enabled'     => '1',
        'active_email_service' => '',
        'email_list_field'     => '',
        'redirect_url'         => '',
        'css_class'            => '',
        'multi_step'           => '0',
        'step_labels'          => array(),
        'show_progress'        => '1',
    );
    $meta = get_post_meta( $form_id, '_wmf_form_data', true );
    if ( ! is_array( $meta ) ) $meta = array();
    return wp_parse_args( $meta, $defaults );
}

function wmf_save_form_meta( $form_id, $data ) {
    update_post_meta( $form_id, '_wmf_form_data', $data );
}

function wmf_get_submissions( $form_id, $args = array() ) {
    global $wpdb;
    $table    = $wpdb->prefix . 'wmf_submissions';
    $defaults = array( 'limit' => 50, 'offset' => 0, 'status' => '', 'search' => '' );
    $args     = wp_parse_args( $args, $defaults );

    $where = $wpdb->prepare( 'WHERE form_id = %d', $form_id );
    if ( $args['status'] )
        $where .= $wpdb->prepare( ' AND status = %s', $args['status'] );
    if ( $args['search'] )
        $where .= $wpdb->prepare( ' AND data LIKE %s', '%' . $wpdb->esc_like( $args['search'] ) . '%' );

    return $wpdb->get_results(
        $wpdb->prepare(
            "SELECT * FROM {$table} {$where} ORDER BY created_at DESC LIMIT %d OFFSET %d",
            $args['limit'], $args['offset']
        )
    );
}

function wmf_count_submissions( $form_id, $status = '', $search = '' ) {
    global $wpdb;
    $where = $wpdb->prepare( 'WHERE form_id = %d', $form_id );
    if ( $status )
        $where .= $wpdb->prepare( ' AND status = %s', $status );
    if ( $search )
        $where .= $wpdb->prepare( ' AND data LIKE %s', '%' . $wpdb->esc_like( $search ) . '%' );
    return (int) $wpdb->get_var( "SELECT COUNT(*) FROM {$wpdb->prefix}wmf_submissions {$where}" );
}

function wmf_get_client_ip() {
    foreach ( array('HTTP_CLIENT_IP','HTTP_X_FORWARDED_FOR','REMOTE_ADDR') as $k ) {
        if ( ! empty( $_SERVER[$k] ) ) {
            $ip = trim( explode(',', $_SERVER[$k])[0] );
            if ( filter_var($ip, FILTER_VALIDATE_IP) ) return $ip;
        }
    }
    return '';
}

/**
 * Sicherer Redirect - funktioniert auch wenn Header bereits gesendet wurden
 * (z.B. durch Plugins die Output vor wp_redirect() ausgeben)
 */
function wmf_safe_redirect( $url ) {
    $url = esc_url_raw( $url );
    if ( ! headers_sent() ) {
        wp_redirect( $url );
        exit;
    }
    // JavaScript-Fallback
    echo '<script>window.location.href=' . wp_json_encode( $url ) . ';</script>';
    echo '<noscript><meta http-equiv="refresh" content="0;url=' . esc_attr( $url ) . '"></noscript>';
    exit;
}