<?php
function kc_teilnehmer_page() {
    global $wpdb;
    $prefix = $wpdb->prefix;
    kc_admin_tabs('kc_teilnehmer');
    // Alle Wahlen + Workshops für Dropdowns und Validierung
    $all_wahlen = $wpdb->get_results("SELECT id, name, anzahl_einheiten FROM {$prefix}kc_wahlen WHERE deleted=0 ORDER BY id DESC");
    $all_workshops = $wpdb->get_results("SELECT id, name FROM {$prefix}kc_workshops ORDER BY name");

    // Map of wahl id => name for quick lookup
    $wahl_name_map = [];
    if (!empty($all_wahlen)) {
        foreach ($all_wahlen as $w) {
            $wahl_name_map[intval($w->id)] = $w->name;
        }
    }

    // Map of workshop id => name for quick lookup in overview
    $workshops_map = [];
    if (!empty($all_workshops)) {
        foreach ($all_workshops as $ws) {
            $workshops_map[intval($ws->id)] = $ws->name;
        }
    }

    // CSV-Export (alle Teilnehmer oder gefiltert nach Wahl/Phase)
    if (isset($_GET['export_teilnehmer_csv']) && current_user_can('manage_options')) {
        $export_wahl_id = isset($_GET['wahl_id']) ? intval($_GET['wahl_id']) : 0;
        $export_phase = isset($_GET['phase']) ? intval($_GET['phase']) : 0;

        $sql = "SELECT * FROM {$prefix}kc_teilnehmer";
        if ($export_wahl_id > 0 && $export_phase > 0) {
            $sql .= $wpdb->prepare(" WHERE wahl_id=%d AND phase=%d", $export_wahl_id, $export_phase);
        } elseif ($export_wahl_id > 0) {
            $sql .= $wpdb->prepare(" WHERE wahl_id=%d", $export_wahl_id);
        } elseif ($export_phase > 0) {
            $sql .= $wpdb->prepare(" WHERE phase=%d", $export_phase);
        }
        $sql .= " ORDER BY wahl_id, phase, nachname, vorname";
        $export_rows = $wpdb->get_results($sql);

        $filename_suffix = '_alle';
        if ($export_wahl_id > 0) {
            $wahl_name_for_file = isset($wahl_name_map[$export_wahl_id]) ? $wahl_name_map[$export_wahl_id] : ('wahl_'.$export_wahl_id);
            $wahl_slug = sanitize_title($wahl_name_for_file);
            if ($wahl_slug === '') {
                $wahl_slug = 'wahl_'.$export_wahl_id;
            }
            $filename_suffix = '_'.$wahl_slug;
            if ($export_phase > 0) {
                $filename_suffix .= '_phase_'.$export_phase;
            }
        } elseif ($export_phase > 0) {
            $filename_suffix = '_phase_'.$export_phase;
        }
        header('Content-Type: text/csv; charset=utf-8');
        header('Content-Disposition: attachment; filename="kc_teilnehmer'.$filename_suffix.'.csv"');
        echo "\xEF\xBB\xBF";

        $output = fopen('php://output', 'w');
        $delimiter = ';';
        fputcsv($output, ['Vorname','Nachname','Wahl','Phase','Wunsch 1','Wunsch 2','Wunsch 3'], $delimiter);

        $csv_clean = function($value) {
            $text = html_entity_decode((string)$value, ENT_QUOTES | ENT_HTML5, 'UTF-8');
            $text = wp_strip_all_tags($text, true);
            $text = preg_replace('/\s+/u', ' ', $text);
            return trim($text);
        };

        foreach ($export_rows as $tn) {
            $w1_id = intval($tn->wunsch1);
            $w2_id = intval($tn->wunsch2);
            $w3_id = intval($tn->wunsch3);

            $w1_disp = $w1_id && isset($workshops_map[$w1_id]) ? $workshops_map[$w1_id] : ($w1_id ? strval($w1_id) : '');
            $w2_disp = $w2_id && isset($workshops_map[$w2_id]) ? $workshops_map[$w2_id] : ($w2_id ? strval($w2_id) : '');
            $w3_disp = $w3_id && isset($workshops_map[$w3_id]) ? $workshops_map[$w3_id] : ($w3_id ? strval($w3_id) : '');

            $wahl_name = isset($wahl_name_map[intval($tn->wahl_id)]) ? $wahl_name_map[intval($tn->wahl_id)] : '';

            $vorname = $csv_clean($tn->vorname);
            $nachname = $csv_clean($tn->nachname);
            $wahl_name_clean = $csv_clean($wahl_name);
            $w1_clean = $csv_clean($w1_disp);
            $w2_clean = $csv_clean($w2_disp);
            $w3_clean = $csv_clean($w3_disp);

            fputcsv($output, [
                $vorname,
                $nachname,
                $wahl_name_clean,
                intval($tn->phase),
                $w1_clean,
                $w2_clean,
                $w3_clean
            ], $delimiter);
        }

        fclose($output);
        exit;
    }

    // Build map of wahl -> phases + workshops (for JS)
    $wahl_map = [];
    foreach($all_wahlen as $w) {
        $wahl_map[intval($w->id)] = ['phases' => max(1,intval($w->anzahl_einheiten)), 'workshops' => []];
    }
    if (!empty($all_workshops)) {
        foreach($all_workshops as $ws) {
            $ww = $wpdb->get_col($wpdb->prepare("SELECT wahl_id FROM {$prefix}kc_wahl_workshops WHERE workshop_id=%d", $ws->id));
            if (!empty($ww)) {
                foreach($ww as $wid) {
                    if (isset($wahl_map[intval($wid)])) {
                        $wahl_map[intval($wid)]['workshops'][] = ['id'=>intval($ws->id),'name'=>$ws->name];
                    }
                }
            }
        }
    }

    // Teilnehmer l�schen
    if (isset($_GET['delete_teilnehmer'])) {
        $tid = intval($_GET['delete_teilnehmer']);
        $wpdb->delete("{$prefix}kc_teilnehmer", ['id' => $tid]);
        echo '<div class="notice notice-success">Teilnehmer gel�scht!</div>';
    }

    // Teilnehmer speichern (neu/�ndern)
    if (isset($_POST['kc_teilnehmer_save'])) {
        // sanitize inputs
        $vorname = sanitize_text_field($_POST['vorname']);
        $nachname = sanitize_text_field($_POST['nachname']);
        $wahl_id_post = intval($_POST['wahl_id']);
        $phase_post = intval($_POST['phase']);
        $w1 = intval($_POST['wunsch1']);
        $w2 = intval($_POST['wunsch2']);
        $w3 = intval($_POST['wunsch3']);

        // Server-side validation: duplicate name in same Wahl (exclude self on edit)
        $norm_v = mb_strtolower(trim($vorname));
        $norm_n = mb_strtolower(trim($nachname));
        if (!empty($_POST['tid'])) {
            $exclude_id = intval($_POST['tid']);
            $exists = $wpdb->get_var($wpdb->prepare("SELECT COUNT(*) FROM {$prefix}kc_teilnehmer WHERE LOWER(TRIM(vorname))=%s AND LOWER(TRIM(nachname))=%s AND wahl_id=%d AND id<>%d", $norm_v, $norm_n, $wahl_id_post, $exclude_id));
        } else {
            $exists = $wpdb->get_var($wpdb->prepare("SELECT COUNT(*) FROM {$prefix}kc_teilnehmer WHERE LOWER(TRIM(vorname))=%s AND LOWER(TRIM(nachname))=%s AND wahl_id=%d", $norm_v, $norm_n, $wahl_id_post));
        }
        if ($exists && $exists > 0) {
            echo '<div class="notice notice-error">Diese Kombination aus Vorname und Nachname existiert bereits für diese Wahl.</div>';
        } else {
            // validate phase within wahl
            $wahl_row = $wpdb->get_row($wpdb->prepare("SELECT anzahl_einheiten FROM {$prefix}kc_wahlen WHERE id=%d", $wahl_id_post));
            $max_ph = $wahl_row ? max(1,intval($wahl_row->anzahl_einheiten)) : 1;
            if ($phase_post < 1 || $phase_post > $max_ph) {
                echo '<div class="notice notice-error">Ungültige Phase für die gewählte Wahl.</div>';
            } else {
                // validate that selected workshops belong to the chosen wahl (if mapping exists)
                $valid_ws = [];
                $ww_rows = $wpdb->get_col($wpdb->prepare("SELECT workshop_id FROM {$prefix}kc_wahl_workshops WHERE wahl_id=%d", $wahl_id_post));
                if (!empty($ww_rows)) foreach($ww_rows as $r) $valid_ws[] = intval($r);
                // if mapping exists, enforce membership
                $check_membership = function($wid) use ($valid_ws) {
                    if (empty($valid_ws)) return true; // no mapping -> allow
                    return in_array(intval($wid), $valid_ws);
                };
                if (!$check_membership($w1) || !$check_membership($w2) || !$check_membership($w3)) {
                    echo '<div class="notice notice-error">Einer oder mehrere ausgewählte Workshops gehören nicht zur gewählten Wahl.</div>';
                } else {
                    $data = [
                        'vorname'    => $vorname,
                        'nachname'   => $nachname,
                        'wahl_id'    => $wahl_id_post,
                        'phase'      => $phase_post,
                        'wunsch1'    => $w1,
                        'wunsch2'    => $w2,
                        'wunsch3'    => $w3
                    ];
                    if (!empty($_POST['tid'])) {
                        $wpdb->update("{$prefix}kc_teilnehmer", $data, ['id'=>intval($_POST['tid'])]);
                        echo '<div class="notice notice-success">Teilnehmer aktualisiert!</div>';
                    } else {
                        $wpdb->insert("{$prefix}kc_teilnehmer", $data);
                        echo '<div class="notice notice-success">Teilnehmer angelegt!</div>';
                    }
                }
            }
        }
    }

    // Teilnehmer bearbeiten
    if (isset($_GET['edit_teilnehmer'])) {
        $tid = intval($_GET['edit_teilnehmer']);
        $tn = $wpdb->get_row($wpdb->prepare("SELECT * FROM {$prefix}kc_teilnehmer WHERE id=%d", $tid));
        echo '<div class="kc-admin-table-wrap">';
        echo '<h2>Teilnehmer bearbeiten</h2>';
        echo '<form method="post">';
        echo '<input type="hidden" name="tid" value="'.intval($tn->id).'">';
        echo '<input type="text" name="vorname" placeholder="Vorname" value="'.esc_attr($tn->vorname).'" required style="margin-bottom:8px;width:100%;padding:7px;">';
        echo '<input type="text" name="nachname" placeholder="Nachname" value="'.esc_attr($tn->nachname).'" required style="margin-bottom:8px;width:100%;padding:7px;">';

        // Wahl select
        echo '<label style="display:block;margin:8px 0 4px 0;font-weight:700;">Wahl</label>';
        echo '<select id="kc-wahl-select" name="wahl_id" required style="margin-bottom:8px;width:100%;padding:7px;">';
        foreach($all_wahlen as $w) {
            $selw = (intval($tn->wahl_id) === intval($w->id)) ? ' selected' : '';
            echo '<option value="'.intval($w->id).'"'.$selw.'>'.esc_html($w->name).'</option>';
        }
        echo '</select>';

        // Phase select (fallback content)
        echo '<label style="display:block;margin:8px 0 4px 0;font-weight:700;">Phase</label>';
        echo '<select id="kc-phase-select" name="phase" required style="margin-bottom:8px;width:100%;padding:7px;">';
        $cur_phases = isset($wahl_map[intval($tn->wahl_id)]) ? $wahl_map[intval($tn->wahl_id)]['phases'] : 1;
        for($i=1;$i<=$cur_phases;$i++){
            $selp = (intval($tn->phase) === $i) ? ' selected' : '';
            echo '<option value="'.intval($i).'"'.$selp.'>'.intval($i).'</option>';
        }
        echo '</select>';

        // Wunsch selects
        for ($k=1;$k<=3;$k++){
            $cur = intval($tn->{'wunsch'.$k});
            echo '<label style="display:block;margin:8px 0 4px 0;font-weight:700;">Wunsch '.intval($k).'</label>';
            echo '<select id="kc-wunsch'.intval($k).'" name="wunsch'.intval($k).'" required style="margin-bottom:8px;width:100%;padding:7px;">';
            echo '<option value="">Bitte Wähle einen Workshop aus</option>';
            foreach($all_workshops as $ws) {
                $sel = ($cur === intval($ws->id)) ? ' selected' : '';
                echo '<option value="'.intval($ws->id).'"'.$sel.'>'.esc_html($ws->name).'</option>';
            }
            echo '</select>';
        }

        echo '<button name="kc_teilnehmer_save" class="kc-btn">Speichern</button>';
        echo '<a href="?page=kc_teilnehmer" class="kc-btn del" style="margin-left:24px;">Abbrechen</a>';
        echo '</form>';

        // Provide JS map and init JS: restrict phases/workshops based on Wahl and init Select2
        echo '<script>var KC_WAHL_MAP = '.json_encode($wahl_map, JSON_HEX_TAG|JSON_HEX_APOS|JSON_HEX_QUOT|JSON_HEX_AMP).';</script>';
        echo '<script>
            (function(){
                function fillPhaseOptions(wid){
                    var ph = KC_WAHL_MAP[wid] ? KC_WAHL_MAP[wid].phases : 1;
                    var sel = document.getElementById("kc-phase-select"); if(!sel) return; sel.innerHTML = "";
                    for(var i=1;i<=ph;i++){ var o=document.createElement("option"); o.value=i; o.text=i; sel.appendChild(o); }
                }
                function fillWorkshopOptions(wid){
                    var list = KC_WAHL_MAP[wid] ? KC_WAHL_MAP[wid].workshops : [];
                    ["kc-wunsch1","kc-wunsch2","kc-wunsch3"].forEach(function(sid){
                        var sel = document.getElementById(sid); if(!sel) return; var cur = sel.value; sel.innerHTML = "";
                        var empty = document.createElement("option"); empty.value = ""; empty.text = "Bitte Wähle einen Workshop aus"; sel.appendChild(empty);
                        list.forEach(function(w){ var o=document.createElement("option"); o.value = w.id; o.text = w.name; sel.appendChild(o); });
                        if(cur) sel.value = cur;
                    });
                }
                jQuery(function($){
                    try{ $("#kc-wunsch1,#kc-wunsch2,#kc-wunsch3,#kc-wahl-select,#kc-phase-select").select2({width: "100%"}); }catch(e){}
                    var wsel = document.getElementById("kc-wahl-select"); if(!wsel) return;
                    wsel.addEventListener("change", function(){ fillPhaseOptions(this.value); fillWorkshopOptions(this.value); try{ $("#kc-wunsch1,#kc-wunsch2,#kc-wunsch3,#kc-phase-select").trigger("change.select2"); }catch(e){} });
                    // initial fill
                    fillPhaseOptions(wsel.value); fillWorkshopOptions(wsel.value);
                });
            })();
        </script>';
        echo '</div>';
        return;
    }

    // Neuer Teilnehmer anlegen
    if (isset($_GET['new'])) {
        echo '<div class="kc-admin-table-wrap">';
        echo '<h2>Neuen Teilnehmer anlegen</h2>';
        echo '<form method="post">';
        echo '<input type="text" name="vorname" placeholder="Vorname" required style="margin-bottom:8px;width:100%;padding:7px;">';
        echo '<input type="text" name="nachname" placeholder="Nachname" required style="margin-bottom:8px;width:100%;padding:7px;">';

        echo '<label style="display:block;margin:8px 0 4px 0;font-weight:700;">Wahl</label>';
        echo '<select id="kc-wahl-select" name="wahl_id" required style="margin-bottom:8px;width:100%;padding:7px;">';
        foreach($all_wahlen as $w) {
            echo '<option value="'.intval($w->id).'">'.esc_html($w->name).'</option>';
        }
        echo '</select>';

        echo '<label style="display:block;margin:8px 0 4px 0;font-weight:700;">Phase</label>';
        echo '<select id="kc-phase-select" name="phase" required style="margin-bottom:8px;width:100%;padding:7px;">';
        $first_wahl = reset($all_wahlen);
        $first_ph = $first_wahl ? max(1,intval($first_wahl->anzahl_einheiten)) : 1;
        for($i=1;$i<=$first_ph;$i++) echo '<option value="'.intval($i).'">'.intval($i).'</option>';
        echo '</select>';

        for ($k=1;$k<=3;$k++){
            echo '<label style="display:block;margin:8px 0 4px 0;font-weight:700;">Wunsch '.intval($k).'</label>';
            echo '<select id="kc-wunsch'.intval($k).'" name="wunsch'.intval($k).'" required style="margin-bottom:8px;width:100%;padding:7px;">';
            echo '<option value="">Bitte Wähle einen Workshop aus</option>';
            foreach($all_workshops as $ws) {
                echo '<option value="'.intval($ws->id).'">'.esc_html($ws->name).'</option>';
            }
            echo '</select>';
        }

        echo '<button name="kc_teilnehmer_save" class="kc-btn">Speichern</button>';
        echo '<a href="?page=kc_teilnehmer" class="kc-btn del" style="margin-left:24px;">Abbrechen</a>';
        echo '</form>';
        // Init Select2 for nicer selects if available
        echo '<script>jQuery(function($){try{ $("#kc-wunsch1,#kc-wunsch2,#kc-wunsch3,#kc-wahl-select,#kc-phase-select").select2({width:"100%"}); }catch(e){} });</script>';
        echo '</div>';
        return;
    }

    // Übersicht
    // Map für Wahl-ID => Name ist bereits oben aufgebaut
    echo '<div class="kc-admin-table-wrap">';
    echo '<h2 style="margin-top:0;">Alle Teilnehmer</h2>';
    echo '<a id="kc-export-current-view" class="kc-btn" style="float:right;margin-right:8px;margin-bottom:12px;background:#2da66a;color:#fff;" href="?page=kc_teilnehmer&export_teilnehmer_csv=1">Teilnehmer-Export (Ansicht)</a>';
    echo '<a class="kc-btn" style="float:right;margin-bottom:12px;" href="?page=kc_teilnehmer&new=1">+ Neuer Teilnehmer</a>';

    // Wahl-Filter-Buttons sortiert nach KC1, KC2, KC3, dann Rest
    $kc_buttons = [];
    $rest_buttons = [];
    foreach($all_wahlen as $w) {
        $name = strtoupper($w->name);
        if ($name === 'KC1' || $name === 'KC2' || $name === 'KC3') {
            $kc_buttons[$name] = $w;
        } else {
            $rest_buttons[] = $w;
        }
    }
    echo '<div style="margin:12px 0;clear:both;display:flex;gap:8px;align-items:center;flex-wrap:wrap;">'
        .'<label style="font-weight:600;">Wahlen filtern:</label>';
    echo '<button type="button" class="kc-btn kc-wahl-filter-btn" data-wahl-id="" style="padding:6px 10px;">Alle</button>';
    foreach(["KC1","KC2","KC3"] as $kc) {
        if(isset($kc_buttons[$kc])) {
            $w = $kc_buttons[$kc];
            echo '<button type="button" class="kc-btn kc-wahl-filter-btn" data-wahl-id="'.intval($w->id).'" style="padding:6px 10px;">'.esc_html($w->name).'</button>';
        }
    }
    foreach($rest_buttons as $w) {
        echo '<button type="button" class="kc-btn kc-wahl-filter-btn" data-wahl-id="'.intval($w->id).'" style="padding:6px 10px;">'.esc_html($w->name).'</button>';
    }
    echo '<span id="kc-wahl-filter-count" style="color:#666;font-size:90%;margin-left:12px;">Alle anzeigen</span>';
    echo '</div>';

    // Platzhalter für Phasen-Filter
    echo '<div id="kc-phase-filter-row" style="display:none;margin:8px 0 16px 0;gap:8px;align-items:center;flex-wrap:wrap;"></div>';

    // Teilnehmer laden und gruppieren nach Wahl und Phase
    $teilnehmer = $wpdb->get_results("SELECT * FROM {$prefix}kc_teilnehmer ORDER BY wahl_id, phase, nachname, vorname");
    $gruppen = [];
    foreach ($teilnehmer as $tn) {
        $wid = intval($tn->wahl_id);
        $ph = intval($tn->phase);
        $gruppen[$wid][$ph][] = $tn;
    }

    foreach ($gruppen as $wid => $phasen) {
        $wahl_disp = isset($wahl_name_map[$wid]) ? esc_html($wahl_name_map[$wid]) : $wid;
        $csv_wahl_url = add_query_arg([
            'page' => 'kc_teilnehmer',
            'export_teilnehmer_csv' => 1,
            'wahl_id' => intval($wid)
        ], admin_url('admin.php'));
        // Gesamtanzahl Teilnehmer für diese Wahl berechnen
        $gesamt = 0;
        foreach ($phasen as $tns) $gesamt += count($tns);
        echo '<details style="margin:10px 0 18px 0;border:1px solid #eaeaea;border-radius:6px;padding:8px;">';
        echo '<summary style="font-weight:700;cursor:pointer;">'. $wahl_disp . ' <span style="color:#555;font-weight:600;">(' . $gesamt . ' TN)</span></summary>';
        echo '<div style="text-align:right;margin:8px 0 4px 0;">';
        echo '<a class="kc-btn" style="background:#2da66a;color:#fff;" href="'.esc_url($csv_wahl_url).'">Teilnehmer-Export dieser Wahl</a>';
        echo '</div>';
        foreach ($phasen as $phase => $tns) {
            echo '<details style="margin:10px 0 10px 0;border:1px solid #f0f0f0;border-radius:6px;padding:8px;">';
            echo '<summary style="font-weight:600;">Phase '.intval($phase).' <span style="color:#555;font-weight:600;">('.count($tns).' TN)</span></summary>';
            echo '<table class="kc-admin-table" style="margin:8px 0;">';
            echo '<thead><tr><th>Vorname</th><th>Nachname</th><th>Wahl</th><th>Phase</th><th>Wunsch 1</th><th>Wunsch 2</th><th>Wunsch 3</th><th>Aktion</th></tr></thead><tbody>';
            foreach ($tns as $tn) {
                $w1_id = intval($tn->wunsch1);
                $w2_id = intval($tn->wunsch2);
                $w3_id = intval($tn->wunsch3);
                $w1_disp = $w1_id && isset($workshops_map[$w1_id]) ? esc_html($workshops_map[$w1_id]) : ($w1_id ? intval($w1_id) : '<em style="color:#999;">Keine</em>');
                $w2_disp = $w2_id && isset($workshops_map[$w2_id]) ? esc_html($workshops_map[$w2_id]) : ($w2_id ? intval($w2_id) : '<em style="color:#999;">Keine</em>');
                $w3_disp = $w3_id && isset($workshops_map[$w3_id]) ? esc_html($workshops_map[$w3_id]) : ($w3_id ? intval($w3_id) : '<em style="color:#999;">Keine</em>');
                $wahl_disp = isset($wahl_name_map[intval($tn->wahl_id)]) ? esc_html($wahl_name_map[intval($tn->wahl_id)]) : intval($tn->wahl_id);
                echo "<tr data-wahl-id='".intval($tn->wahl_id)."'>
                    <td>".esc_html($tn->vorname)."</td>
                    <td>".esc_html($tn->nachname)."</td>
                    <td>".$wahl_disp."</td>
                    <td>".intval($tn->phase)."</td>
                    <td>".$w1_disp."</td>
                    <td>".$w2_disp."</td>
                    <td>".$w3_disp."</td>
                    <td class='kc-actions'>
                        <a class='kc-btn edit' href='?page=kc_teilnehmer&edit_teilnehmer={$tn->id}'>Bearbeiten</a>
                        <a class='kc-btn del' href='?page=kc_teilnehmer&delete_teilnehmer={$tn->id}' onclick=\"return confirm('Wirklich löschen?');\">Löschen</a>
                    </td>
                </tr>";
            }
            echo '</tbody></table>';
            echo '</details>';
        }
        echo '</details>';
    }
    // JS für Wahl- und Phasen-Filter
    echo '<style>.kc-wahl-filter-btn.active{background:#4CAF50;color:#fff;} .kc-phase-filter-btn.active{background:#1976d2;color:#fff;}</style>';
    echo '<script>
    (function() {
        var btns = Array.prototype.slice.call(document.querySelectorAll(".kc-wahl-filter-btn"));
        var rows = Array.prototype.slice.call(document.querySelectorAll(".kc-admin-table tbody tr"));
        var status = document.getElementById("kc-wahl-filter-count");
        var phaseRow = document.getElementById("kc-phase-filter-row");
        var exportBtn = document.getElementById("kc-export-current-view");
        // Wahl-Map für Phasen
        var wahlMap = '.json_encode($wahl_map, JSON_HEX_TAG|JSON_HEX_APOS|JSON_HEX_QUOT|JSON_HEX_AMP).';
        var currentWahl = "";
        var currentPhase = "";

        function updateExportButton() {
            if (!exportBtn) return;
            var href = "?page=kc_teilnehmer&export_teilnehmer_csv=1";
            if (currentWahl) href += "&wahl_id=" + encodeURIComponent(currentWahl);
            if (currentPhase) href += "&phase=" + encodeURIComponent(currentPhase);
            exportBtn.setAttribute("href", href);
        }

        function renderPhaseButtons(wahlId) {
            phaseRow.innerHTML = "";
            if (!wahlId || !wahlMap[wahlId]) { phaseRow.style.display = "none"; currentPhase = ""; return; }
            var phases = wahlMap[wahlId].phases || 1;
            var label = document.createElement("label");
            label.textContent = "Phasen filtern:";
            label.style.fontWeight = "600";
            label.style.marginRight = "8px";
            phaseRow.appendChild(label);
            var allBtn = document.createElement("button");
            allBtn.type = "button";
            allBtn.className = "kc-btn kc-phase-filter-btn active";
            allBtn.setAttribute("data-phase", "");
            allBtn.style.padding = "6px 10px";
            allBtn.textContent = "Alle";
            phaseRow.appendChild(allBtn);
            for(var i=1;i<=phases;i++){
                var btn = document.createElement("button");
                btn.type = "button";
                btn.className = "kc-btn kc-phase-filter-btn";
                btn.setAttribute("data-phase", i);
                btn.style.padding = "6px 10px";
                btn.textContent = i;
                phaseRow.appendChild(btn);
            }
            phaseRow.style.display = "flex";
        }

        function applyFilter(wahlId, phase) {
            var shown = 0;
            rows.forEach(function(row) {
                var rid = row.getAttribute("data-wahl-id");
                var ph = row.querySelector("td:nth-child(4)").textContent.trim();
                var show = false;
                if (!wahlId) {
                    show = true;
                } else if (!phase) {
                    show = (rid == wahlId);
                } else {
                    show = (rid == wahlId && ph == phase);
                }
                row.style.display = show ? "" : "none";
                if (show) shown++;
            });
            if (status) status.textContent = (wahlId ? (shown+" angezeigt") : "Alle anzeigen");
            updateExportButton();
        }

        function attachPhaseEvents() {
            var phaseBtns = Array.prototype.slice.call(document.querySelectorAll(".kc-phase-filter-btn"));
            phaseBtns.forEach(function(btn) {
                btn.addEventListener("click", function() {
                    phaseBtns.forEach(function(b){b.classList.remove("active");});
                    btn.classList.add("active");
                    currentPhase = btn.getAttribute("data-phase");
                    applyFilter(currentWahl, currentPhase);
                });
            });
        }

        btns.forEach(function(btn) {
            btn.addEventListener("click", function() {
                btns.forEach(function(b){b.classList.remove("active");});
                btn.classList.add("active");
                var wahlId = btn.getAttribute("data-wahl-id");
                currentWahl = wahlId;
                currentPhase = "";
                renderPhaseButtons(wahlId);
                applyFilter(wahlId, "");
                attachPhaseEvents();
            });
        });
        // Default: Alle aktiv
        if(btns.length) btns[0].classList.add("active");
        renderPhaseButtons("");
        applyFilter("", "");
        updateExportButton();
    })();
    </script>';
    echo '</div>';
}
?>