#include <QCoreApplication>
#include "messagelist.h"
#include "debug_ui.h"
#include "chatview.h"
#include "messagedelegate.h"
#include "inputbar.h"
#include "media_async/attachment_send.h"
#include "emojipanel.h"
#include "emoji.h"
#include "animtimer.h"
#include "lottieicon.h"
#include "audiorecorder.h"
#include "voiceplayback.h"
#include "../db/db_manager.h"
#include "../../lib/debug_config.h"
#include <QVBoxLayout>
#include <QPainter>
#include <QPixmap>
#include <QStyle>
#include <QSignalBlocker>
#include <QDateTime>
#include <QJsonDocument>
#include <QJsonObject>
#include <QJsonArray>
#include <QFile>
#include <QScrollBar>
#include <QApplication>
#include <QPointer>
#include <QDebug>
#include <QFileInfo>
#include <QFile>
#include <QImageReader>
#include <QMenu>
#include <QFileDialog>
#include <QToolTip>
#include <vector>
#include <memory>
#include <thread>

static std::vector<std::unique_ptr<LottieIcon>> s_icons;

extern "C" {
#include "../transport/gui_bridge.h"
#include "chat/chat_core.h"
#include "chat/chat_poll.h"
#include "dm/dm_core.h"
#include "dm/dm_media.h"
#include "video/video.h"
#include "radio/radio.h"
#include "../../lib/u_async.h"
#include "../../lib/mem.h"
#include "../../lib/audio_compressor.h"
#include "../../lib/debug_config.h"
void chat_core_save_ui_state_trampoline(void* arg);
}

#include "radio_audio_engine.h"
#include "radiopanel.h"
#include "flagpainter.h"
#include "avatars/avatarmanager.h"
#include "avatars/avatargallery.h"
#include <QLabel>
#include <QPushButton>
#include <QHBoxLayout>

// Портативная рация: один и тот же значок во всех состояниях кнопки.
static QIcon makeRadioIcon(const QColor& color) {
    QPixmap pix(48, 48);
    pix.fill(Qt::transparent);
    QPainter p(&pix);
    FlagPainter::drawRadio(&p, 0, 0, 48, color);
    p.end();
    QIcon icon;
    // Явно задаём все режимы: Qt не перекрашивает значок при checked/disabled.
    for (auto mode : {QIcon::Normal, QIcon::Disabled, QIcon::Active, QIcon::Selected}) {
        icon.addPixmap(pix, mode, QIcon::Off);
        icon.addPixmap(pix, mode, QIcon::On);
    }
    return icon;
}

static QPixmap makeAvatar(const QColor &color, const QString &letter, int size = MessageDelegate::kAvatar) {
    QPixmap pix(size, size);
    pix.fill(Qt::transparent);
    QPainter p(&pix);
    p.setRenderHint(QPainter::Antialiasing);
    p.setBrush(color);
    p.setPen(Qt::NoPen);
    p.drawEllipse(0, 0, size, size);
    p.setPen(Qt::white);
    QFont f = p.font();
    f.setBold(true);
    f.setPointSize(size / 3);
    p.setFont(f);
    p.drawText(QRect(0, 0, size, size), Qt::AlignCenter, letter);
    p.end();
    return pix;
}

static QVariant makeReaction(const QString &emoji, int count,
                             const QList<QColor> &colors = {}) {
    QVariantMap m;
    m["emoji"] = emoji;
    m["count"] = count;
    if (!colors.isEmpty())
        m["colors"] = QVariant::fromValue(colors);
    return m;
}

static QString parseJsonField(const QByteArray& data, const char* field) {
    QByteArray pat = QByteArray("\"") + field + "\":\"";
    int idx = data.indexOf(pat);
    if (idx < 0) return {};
    idx += pat.size();
    int end = data.indexOf('"', idx);
    if (end < 0) return {};
    return QString::fromUtf8(data.mid(idx, end - idx));
}

static QString parseJsonFieldNum(const QByteArray& data, const char* field) {
    QByteArray pat = QByteArray("\"") + field + "\":";
    int idx = data.indexOf(pat);
    if (idx < 0) return {};
    idx += pat.size();
    int end = data.indexOf(',', idx);
    if (end < 0) end = data.indexOf('}', idx);
    if (end < 0) return {};
    return QString::fromUtf8(data.mid(idx, end - idx));
}

static QString contentTypeFromJson(const QByteArray& data) {
    return parseJsonField(data, "ct");
}

static void setVoiceMessageRoles(QStandardItem* item, const QByteArray& data,
                                   const QString& contentType, const QString& mediaDirBase,
                                   const QString& channelId, const QByteArray& localAttrs) {
    QByteArray body = data;
    if (body.startsWith('*')) {
        int pipePos = body.indexOf('|');
        if (pipePos > 1) {
            QByteArray b64 = body.mid(1, pipePos - 1);
            b64.replace('-', '+');
            b64.replace('_', '/');
            body = QByteArray::fromBase64(b64) + body.mid(pipePos);
        }
    }
    QString ct = contentType;
    if (ct.isEmpty()) ct = contentTypeFromJson(data);
    if (ct.isEmpty()) ct = "text/plain";
    item->setData(ct, MsgContentTypeRole);
    item->setData(channelId, MsgChannelIdRole);

    if (ct == "audio/opus") {
        QString raw = QString::fromUtf8(body);
        if (raw.startsWith('{')) return;

        /* unified format: wf={base64};dur={ms};|{file_size}|{block_size}|{num_blocks}|{sigs} */
        QString wfData;
        int durMs = 0;

        if (raw.startsWith("wf=")) {
            int durPos = raw.indexOf(";dur=", 3);
            int durEnd = raw.indexOf(';', durPos + 5);
            if (durPos > 0 && durEnd > 0) {
                wfData = raw.mid(3, durPos - 3);  /* 100 base64 chars */
                durMs  = raw.mid(durPos + 5, durEnd - durPos - 5).toInt();
            }
        }
        item->setData(QString::number(durMs / 1000.0, 'f', 1) + "s", MsgVoiceDurationRole);

        /* block metadata after last ; */
        int pipePos = raw.indexOf('|');
        if (pipePos > 0) {
            QString meta = raw.mid(pipePos + 1);
            QStringList parts = meta.split('|');
            if (parts.size() >= 4) {
                item->setData(parts[0].toULongLong(), MsgVoiceFileSizeRole);
                item->setData(parts[1].toULongLong(), MsgVoiceBlockSizeRole);
                item->setData(parts[2].toUInt(),    MsgVoiceNumBlocksRole);
                item->setData(parts[3],             MsgVoiceSigsRole);
                item->setData(parts[2].toUInt(),    MsgMediaNumBlocksRole);
            }
        }

        /* file path from local_attrs */
        QJsonObject la = QJsonDocument::fromJson(localAttrs).object();
        QString fp = la.value("fp").toString();
        QString st = la.value("st").toString();
        int dlState = (st == "fl" && !fp.isEmpty()) ? 2 : 0;
        item->setData(dlState, MsgFileDownloadStateRole);
        if (!fp.isEmpty()) {
            QString fullPath = mediaDirBase + "/" + channelId + "/" + fp;
            item->setData(fullPath, MsgVoiceFileRole);
        }

        /* decode base64 waveform to normalized 0..1 float list */
        if (!wfData.isEmpty()) {
            QList<QVariant> wf;
            for (int i = 0; i < wfData.size(); i++) {
                QChar c = wfData[i];
                int idx = 0;
                if (c >= 'A' && c <= 'Z') idx = c.unicode() - 'A';
                else if (c >= 'a' && c <= 'z') idx = c.unicode() - 'a' + 26;
                else if (c >= '0' && c <= '9') idx = c.unicode() - '0' + 52;
                else if (c == '+') idx = 62;
                else if (c == '/') idx = 63;
                wf.append((float)idx / 63.0f);
            }
            item->setData(wf, MsgVoiceWaveformRole);
        }
    }
    if (ct == "application/octet-stream") {
        QString raw = QString::fromUtf8(body);
        int pipePos = raw.indexOf('|');
        QString fname = (pipePos > 0) ? raw.left(pipePos) : raw;
        item->setData(fname, MsgFileDisplayNameRole);

        if (pipePos > 0) {
            QString meta = raw.mid(pipePos + 1);
            QStringList parts = meta.split('|');
            if (parts.size() >= 1)
                item->setData(parts[0].toULongLong(), MsgFileSizeRole);
            if (parts.size() >= 3)
                item->setData(parts[2].toUInt(), MsgMediaNumBlocksRole);
        }

        /* parse download state from local_attrs */
        QJsonObject la = QJsonDocument::fromJson(localAttrs).object();
        QString st = la.value("st").toString();
        QString fp = la.value("fp").toString();
        int dlState = 0; /* 0=not started, 2=downloaded */
        if (st == "fl" && !fp.isEmpty()) {
            dlState = 2; /* downloaded */
            QString fullPath = mediaDirBase + "/" + channelId + "/" + fp;
            item->setData(fullPath, MsgVoiceFileRole);
        }
        item->setData(dlState, MsgFileDownloadStateRole);
    }
    if (ct == "video/mp4") {
        QString raw = QString::fromUtf8(body);
        int pipePos = raw.indexOf('|');
        QString fname = (pipePos > 0) ? raw.left(pipePos) : raw;
        item->setData(fname, MsgFileDisplayNameRole);

        if (pipePos > 0) {
            QString meta = raw.mid(pipePos + 1);
            QStringList parts = meta.split('|');
            if (parts.size() >= 1)
                item->setData(parts[0].toULongLong(), MsgFileSizeRole);
            if (parts.size() >= 3)
                item->setData(parts[2].toUInt(), MsgMediaNumBlocksRole);
            /* dur/w/h в хвосте: |dur=<ms>|w=<w>|h=<h> */
            for (const QString& p : parts) {
                if (p.startsWith("dur=")) {
                    qint64 durMs = p.mid(4).toLongLong();
                    if (durMs > 0) {
                        qint64 s = durMs / 1000;
                        QString d = QString("%1:%2").arg(s / 60).arg(s % 60, 2, 10, QChar('0'));
                        item->setData(d, MsgVoiceDurationRole);
                    }
                    item->setData((qlonglong)durMs, MsgVideoDurationMsRole);
                } else if (p.startsWith("w=")) {
                    item->setData(p.mid(2).toInt(), MsgVideoWidthRole);
                } else if (p.startsWith("h=")) {
                    item->setData(p.mid(2).toInt(), MsgVideoHeightRole);
                }
            }
        }

        QJsonObject la = QJsonDocument::fromJson(localAttrs).object();
        QString st = la.value("st").toString();
        QString fp = la.value("fp").toString();
        int dlState = 0;
        if (st == "fl" && !fp.isEmpty()) {
            dlState = 2;
            QString fullPath = mediaDirBase + "/" + channelId + "/" + fp;
            item->setData(fullPath, MsgVoiceFileRole);
        }
        item->setData(dlState, MsgFileDownloadStateRole);
    }
    if (ct.startsWith("image/")) {
        QString raw = QString::fromUtf8(body);
        int pipePos = raw.indexOf('|');
        QString fname = (pipePos > 0) ? raw.left(pipePos) : raw;
        item->setData(fname, MsgFileDisplayNameRole);

        if (pipePos > 0) {
            QString meta = raw.mid(pipePos + 1);
            QStringList parts = meta.split('|');
            if (parts.size() >= 1)
                item->setData(parts[0].toULongLong(), MsgFileSizeRole);
            if (parts.size() >= 3)
                item->setData(parts[2].toUInt(), MsgMediaNumBlocksRole);
            /* хвост: |w=<w>|h=<h> */
            for (const QString& p : parts) {
                if (p.startsWith("w=")) item->setData(p.mid(2).toInt(), MsgImageWidthRole);
                else if (p.startsWith("h=")) item->setData(p.mid(2).toInt(), MsgImageHeightRole);
            }
        }

        QJsonObject la = QJsonDocument::fromJson(localAttrs).object();
        QString st = la.value("st").toString();
        QString fp = la.value("fp").toString();
        int dlState = 0;
        if (st == "fl" && !fp.isEmpty()) {
            dlState = 2;
            QString fullPath = mediaDirBase + "/" + channelId + "/" + fp;
            item->setData(fullPath, MsgVoiceFileRole);
        }
        item->setData(dlState, MsgFileDownloadStateRole);
    }
}

static void setMsg(QStandardItem *item,
                   const QString &author, const QString &text, const QString &time,
                   const QPixmap &avatar, bool edited,
                   bool hasQuote, const QString &qAuthor, const QString &qText,
                   const QVariantList &reactions) {
    item->setData(author,  MsgAuthorRole);
    item->setData(text,    MsgTextRole);
    item->setData(time,    MsgTimeRole);
    item->setData(edited,  MsgEditedRole);
    item->setData(QVariant::fromValue(avatar), MsgAvatarRole);
    item->setData(hasQuote, MsgHasQuoteRole);
    if (hasQuote) {
        item->setData(qAuthor, MsgQuoteAuthorRole);
        item->setData(qText,   MsgQuoteTextRole);
    }
    if (!reactions.isEmpty())
        item->setData(reactions, MsgReactionsRole);
}

MessageList::MessageList(DbManager* db, AudioRecorder* recorder, QWidget *parent)
    : QWidget(parent)
    , m_view(new ChatView(this))
    , m_model(new QStandardItemModel(this))
    , m_inputBar(nullptr)
    , m_emojiPanel(nullptr)
    , m_db(db)
    , m_recorder(recorder)
{
    auto *layout = new QVBoxLayout(this);
    if (auto* manager = AvatarManager::instance()) connect(manager, &AvatarManager::changed, this,
        [this, manager](const QString& channel, quint64 owner) {
            if (channel != m_currentChannelId && !isDmChannel(m_currentChannelId)) return;
            const QImage image = manager->image(m_currentChannelId, owner);
            for (int row = 0; row < m_model->rowCount(); row++) {
                auto* item = m_model->item(row);
                if (item->data(MsgAuthorNodeIdRole).toULongLong() != owner) continue;
                QPixmap avatar;
                if (!image.isNull()) avatar = QPixmap::fromImage(image);
                else {
                    const AccountRow account = m_db->getAccount(owner);
                    avatar = makeAvatar(QColor(account.avatarColor), account.avatarLetter.isEmpty() ? authorName(owner).left(1) : account.avatarLetter);
                }
                item->setData(avatar, MsgAvatarRole);
            }
        });
    layout->setContentsMargins(0, 0, 0, 0);
    layout->setSpacing(0);

    connect(m_view, &ChatView::linkActivated, this, &MessageList::linkActivated);

    /* ── шапка чата: название канала + переключатель рации ── */
    {
        auto* header = new QWidget(this);
        auto* hl = new QHBoxLayout(header);
        hl->setContentsMargins(10, 6, 10, 6);
        hl->setSpacing(8);

        m_peerStatus = new QLabel(header);
        m_peerStatus->setFixedSize(12, 12);
        m_peerStatus->hide();
        hl->addWidget(m_peerStatus);
        m_channelTitle = new QLabel(header);
        m_channelTitle->setStyleSheet("font-weight: bold; font-size: 14px;");
        m_channelTitle->setText(QCoreApplication::translate("ChatGui", "Channel"));
        hl->addWidget(m_channelTitle, 1);
        m_pollBtn = new QPushButton(QCoreApplication::translate("ChatGui", "Create poll"), header);
        hl->addWidget(m_pollBtn);
        connect(m_pollBtn, &QPushButton::clicked, this, &MessageList::createPoll);

        m_talkingLabel = new QLabel(header);
        m_talkingLabel->setStyleSheet("color: #27ae60; font-size: 12px;");
        m_talkingLabel->hide();
        hl->addWidget(m_talkingLabel);

        m_inviteBtn = new QPushButton(QStringLiteral("+"), header);
        m_inviteBtn->setAccessibleName(QCoreApplication::translate("ChatGui", "Invite to group"));
        m_inviteBtn->setToolTip(QCoreApplication::translate("ChatGui", "Invite to group"));
        m_inviteBtn->setFixedSize(34, 30);
        m_inviteBtn->setCursor(Qt::PointingHandCursor);
        m_inviteBtn->hide();
        hl->addWidget(m_inviteBtn);
        connect(m_inviteBtn, &QPushButton::clicked, this, [this]() {
            if (!m_db || !isDmChannel(m_currentChannelId)) return;
            for (const auto& conv : m_db->getDmConversations()) {
                if (conv.convId == dmConvId(m_currentChannelId)) {
                    emit inviteRequested(QString(), conv.peerNodeId, m_channelTitle->text());
                    return;
                }
            }
            GUI_ERROR("invite PM: conversation not found target=%s", qPrintable(m_currentChannelId));
        });

        m_callBtn = new QPushButton(QStringLiteral("☎"), header);
        m_callBtn->setAccessibleName(QCoreApplication::translate("ChatGui", "Call peer"));
        m_callBtn->setFixedSize(34, 30);
        m_callBtn->setCursor(Qt::PointingHandCursor);
        m_callBtn->hide();
        clearDmCallRoute();
        hl->addWidget(m_callBtn);
        connect(m_callBtn, &QPushButton::clicked, this, [this]() {
            if (m_callBtn->isEnabled() && m_callPeer && isDmChannel(m_currentChannelId))
                emit callRequested(m_currentChannelId, m_callPeer, m_channelTitle->text());
        });

        m_radioBtn = new QPushButton(header);
        m_radioBtn->setIcon(makeRadioIcon(header->palette().color(QPalette::ButtonText)));
        m_radioBtn->setIconSize(QSize(24, 24));
        m_radioBtn->setAccessibleName(QCoreApplication::translate("ChatGui", "Radio"));
        m_radioBtn->setCheckable(true);
        m_radioBtn->setFixedSize(34, 30);
        m_radioBtn->setCursor(Qt::PointingHandCursor);
        m_radioBtn->setToolTip(QCoreApplication::translate("ChatGui", "Radio: toggle channel listening"));
        m_radioBtn->setStyleSheet(
            "QPushButton { border: 1px solid palette(mid); border-radius: 6px; background: palette(base); font-size: 15px; }"
            "QPushButton:checked { background: #27ae60; border-color: #27ae60; }");
        connect(m_radioBtn, &QPushButton::toggled, this, &MessageList::onRadioToggled);
        hl->addWidget(m_radioBtn);

        header->setStyleSheet("background: palette(window);");
        layout->addWidget(header);
    }

    m_radioPanel = new RadioPanel(this);
    m_radioPanel->hide();
    layout->addWidget(m_radioPanel);

    m_view->setModel(m_model);
    auto* msgDelegate = new MessageDelegate(this);
    m_view->setLinkHitTest([this, msgDelegate](const QModelIndex& index, const QPoint& point) {
        QStyleOptionViewItem option; option.initFrom(m_view); option.widget = m_view; option.rect = m_view->visualRect(index);
        return msgDelegate->linkAt(option, index, point);
    });
    msgDelegate->setVideoOpenCallback([this](const QString& path) {
        emit openVideoRequested(path);
    });
    msgDelegate->setImageOpenCallback([this](const QString& path) {
        emit openImageRequested(path);
    });
    connect(msgDelegate, &MessageDelegate::avatarRequested, this, [](const QString& channel, quint64 owner) {
        showAvatarGallery(channel, owner);
    });
    connect(msgDelegate, &MessageDelegate::reactionRequested, this, &MessageList::requestReaction);
    connect(msgDelegate, &MessageDelegate::pollRequested, this, &MessageList::showPoll);
    connect(msgDelegate, &MessageDelegate::replyRequested, this, &MessageList::jumpToMessage);
    connect(m_view, &ChatView::latestRequested, this, [this]() {
        if (m_historyAnchor.isEmpty()) return;
        m_historyAnchor.clear(); loadChannel(m_currentChannelId);
        QTimer::singleShot(0, m_view, &QListView::scrollToBottom);
    });
    msgDelegate->setDownloadCallback([](const QModelIndex& index) {
        QString target = index.data(MsgChannelIdRole).toString();
        qint64 id = index.data(MsgIdRole).toLongLong();
        if (target.isEmpty() || target.startsWith("dm:") || id <= 0) return false;
        auto* req = (struct attachment_dl_req*)u_calloc(1, sizeof(struct attachment_dl_req));
        if (!req) { DEBUG_ERROR(DEBUG_CATEGORY_MEDIA, "attachment: download request allocation failed"); return false; }
        req->inst = gui_bridge_get_inst(); req->msg_id = id;
        snprintf(req->channel_id, sizeof(req->channel_id), "%s", target.toUtf8().constData());
        gui_bridge_post_uasync_fn(chat_core_attachment_download_trampoline, req);
        return true;
    });
    m_view->setItemDelegate(msgDelegate);
    m_view->setEditTriggers(QAbstractItemView::NoEditTriggers);
    m_view->setSelectionMode(QAbstractItemView::NoSelection);
    m_view->setContextMenuPolicy(Qt::CustomContextMenu);
    connect(m_view, &QWidget::customContextMenuRequested,
            this, &MessageList::onMessageContextMenu);
    m_view->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
    m_view->setVerticalScrollMode(QAbstractItemView::ScrollPerPixel);
    m_view->setFrameShape(QFrame::NoFrame);
    m_view->setBackgroundImage("../resources/bg.png");
    layout->addWidget(m_view, 1);

    if (s_icons.empty()) {
        for (const auto &cat : builtinEmojiSet()) {
            for (const auto &e : cat.items) {
                if (e.type == EmojiType::Animation && !e.animPath.isEmpty()) {
                    QFile f(e.animPath);
                    if (f.open(QIODevice::ReadOnly)) {
                        QByteArray raw = f.readAll();
                        auto icon = std::make_unique<LottieIcon>(raw, e.animPath);
                        if (icon->isValid()) {
                            AnimTimer::instance()->registerIcon(e.animPath, icon.get());
                            s_icons.push_back(std::move(icon));
                        }
                    }
                }
            }
        }
    }

    m_emojiPanel = new EmojiPanel(this);
    layout->addWidget(m_emojiPanel);

    m_inputBar = new InputBar(m_emojiPanel, recorder, this);
    layout->addWidget(m_inputBar);
    m_inputBar->installFileDropTarget(m_view->viewport());

    connect(m_inputBar, &InputBar::sendMessage, this, [this](const QString &text, const QByteArray& reply, quint64 request) {
        if (!gui_bridge_get_inst() || !gui_bridge_is_uasync_ready()) {
            GUI_ERROR("send: core unavailable"); m_inputBar->submissionResult(request, false); return;
        }
        if (m_currentChannelId.isEmpty()) {
            qWarning("MessageList: no channel selected, message not sent");
            m_inputBar->submissionResult(request, false);
            return;
        }

        if (isDmChannel(m_currentChannelId)) {
            QByteArray textData = text.toUtf8();
            QString conv = dmConvId(m_currentChannelId);
            struct dm_send_req* req = (struct dm_send_req*)u_malloc(sizeof(struct dm_send_req) + textData.size());
            if (!req) return;
            memset(req, 0, sizeof(*req));
            req->inst = gui_bridge_get_inst();
            strncpy(req->conv_id, conv.toUtf8().constData(), sizeof(req->conv_id) - 1);
            req->data = (uint8_t*)(req + 1);
            req->data_len = (uint32_t)textData.size();
            memcpy(req->data, textData.constData(), textData.size());
            gui_bridge_post_uasync_fn(dm_send_trampoline, req);
            return;
        }

        QByteArray textData = text.toUtf8();
        auto ts = QDateTime::currentMSecsSinceEpoch();

        struct chat_msg_submit* req = (struct chat_msg_submit*)
            u_malloc(sizeof(struct chat_msg_submit) + textData.size());
        if (!req) { GUI_ERROR("send: text request allocation failed"); m_inputBar->submissionResult(request, false); return; }
        memset(req, 0, sizeof(*req));
        if (reply.size() == 32) memcpy(req->reply_to, reply.constData(), 32);
        req->request_id = request;
        req->inst = gui_bridge_get_inst();
        snprintf(req->channel_id, sizeof(req->channel_id), "%s",
                 m_currentChannelId.toUtf8().constData());
        snprintf(req->content_type, sizeof(req->content_type), "text/plain");
        req->data = (uint8_t*)(req + 1);
        req->data_len = (uint32_t)textData.size();
        memcpy(req->data, textData.constData(), textData.size());
        req->timestamp = (uint64_t)ts;
        gui_bridge_post_uasync_fn(chat_core_submit_trampoline, req);
    });

    connect(m_inputBar, &InputBar::submitAttachment, this, [this](const QString& target, struct attachment_send_req* req) {
        if (!gui_bridge_get_inst() || !gui_bridge_is_uasync_ready()) {
            GUI_ERROR("send: attachment core unavailable"); m_inputBar->submissionResult(req->request_id, false);
            if (req->pcm_release) req->pcm_release(req->pcm_owner); else u_free((void*)req->pcm);
            audio_compressor_destroy(req->compressor); u_free(req); return;
        }
        req->inst = gui_bridge_get_inst(); req->is_dm = isDmChannel(target);
        QByteArray id = (req->is_dm ? dmConvId(target) : target).toUtf8();
        snprintf(req->target, sizeof(req->target), "%s", id.constData());
        gui_bridge_post_uasync_fn(attachment_send_trampoline, req);
    });

    connect(m_inputBar, &InputBar::sendFileAttachment, this, [this](const QString& target, const QString& mediaSrc, const QString& mediaDest,
                                                                      const QString& displayName, const QByteArray& reply, quint64 request) {
        if (target.isEmpty() || !gui_bridge_get_inst() || !gui_bridge_is_uasync_ready()) {
            GUI_ERROR("send: file target/core unavailable"); m_inputBar->submissionResult(request, false); return;
        }
        if (isDmChannel(target)) {
            auto* req = (struct dm_file_req*)u_calloc(1, sizeof(struct dm_file_req));
            if (!req) { DEBUG_ERROR(DEBUG_CATEGORY_DM, "PM file request allocation failed"); return; }
            req->inst = gui_bridge_get_inst();
            QByteArray conv = dmConvId(target).toUtf8(), path = mediaSrc.toUtf8(), name = displayName.toUtf8();
            if (path.size() >= (int)sizeof(req->path) || name.size() >= (int)sizeof(req->info.name)) {
                DEBUG_ERROR(DEBUG_CATEGORY_DM, "PM attachment path or name is too long"); u_free(req); return;
            }
            snprintf(req->conv, sizeof(req->conv), "%s", conv.constData());
            snprintf(req->path, sizeof(req->path), "%s", path.constData());
            req->info.kind = ATTACHMENT_FILE;
            snprintf(req->info.name, sizeof(req->info.name), "%s", name.constData());
            gui_bridge_post_uasync_fn(dm_send_file_trampoline, req);
            return;
        }

        QByteArray textData = displayName.toUtf8();
        auto ts = QDateTime::currentMSecsSinceEpoch();

        struct chat_msg_submit* req = (struct chat_msg_submit*)
            u_malloc(sizeof(struct chat_msg_submit) + textData.size());
        if (!req) { GUI_ERROR("send: file request allocation failed"); m_inputBar->submissionResult(request, false); return; }
        memset(req, 0, sizeof(*req));
        if (reply.size() == 32) memcpy(req->reply_to, reply.constData(), 32);
        req->request_id = request;
        req->inst = gui_bridge_get_inst();
        snprintf(req->channel_id, sizeof(req->channel_id), "%s",
                 target.toUtf8().constData());
        snprintf(req->content_type, sizeof(req->content_type), "application/octet-stream");
        snprintf(req->media_src, sizeof(req->media_src), "%s", mediaSrc.toUtf8().constData());
        snprintf(req->media_dest, sizeof(req->media_dest), "%s", mediaDest.toUtf8().constData());
        req->media_copy = (mediaSrc != mediaDest) ? 1 : 0;
        req->data = (uint8_t*)(req + 1);
        req->data_len = (uint32_t)textData.size();
        memcpy(req->data, textData.constData(), textData.size());
        req->timestamp = (uint64_t)ts;
        gui_bridge_post_uasync_fn(chat_core_submit_trampoline, req);
    });

    connect(m_inputBar, &InputBar::sendImageAttachment, this, [this](const QString& target, const QString& mediaSrc, const QString& mediaDest,
                                                                      const QString& displayName, const QByteArray& reply, quint64 request) {
        if (target.isEmpty() || !gui_bridge_get_inst() || !gui_bridge_is_uasync_ready()) {
            GUI_ERROR("send: image target/core unavailable"); m_inputBar->submissionResult(request, false); return;
        }

        QByteArray textData = displayName.toUtf8();
        auto ts = QDateTime::currentMSecsSinceEpoch();

        QFileInfo fi(displayName);
        QString suf = fi.suffix().toLower();
        QString ct = "image/jpeg";
        if (suf == "png") ct = "image/png";
        else if (suf == "gif") ct = "image/gif";
        else if (suf == "bmp") ct = "image/bmp";
        else if (suf == "webp") ct = "image/webp";

        int iw = 0, ih = 0;
        QImageReader reader(mediaSrc);
        reader.setAutoTransform(true);
        if (reader.canRead()) {
            QSize sz = reader.size();
            if (sz.width() > 0 && sz.height() > 0) { iw = sz.width(); ih = sz.height(); }
        }

        struct chat_msg_submit* req = (struct chat_msg_submit*)
            u_malloc(sizeof(struct chat_msg_submit) + textData.size());
        if (!req) { GUI_ERROR("send: image request allocation failed"); m_inputBar->submissionResult(request, false); return; }
        memset(req, 0, sizeof(*req));
        if (reply.size() == 32) memcpy(req->reply_to, reply.constData(), 32);
        req->request_id = request;
        req->inst = gui_bridge_get_inst();
        snprintf(req->channel_id, sizeof(req->channel_id), "%s",
                 target.toUtf8().constData());
        snprintf(req->content_type, sizeof(req->content_type), "%s", ct.toUtf8().constData());
        snprintf(req->media_src, sizeof(req->media_src), "%s", mediaSrc.toUtf8().constData());
        snprintf(req->media_dest, sizeof(req->media_dest), "%s", mediaDest.toUtf8().constData());
        req->media_copy = (mediaSrc != mediaDest) ? 1 : 0;
        req->media_video = 0;
        req->width = iw;
        req->height = ih;
        req->data = (uint8_t*)(req + 1);
        req->data_len = (uint32_t)textData.size();
        memcpy(req->data, textData.constData(), textData.size());
        req->timestamp = (uint64_t)ts;
        gui_bridge_post_uasync_fn(chat_core_submit_trampoline, req);
    });

    connect(AnimTimer::instance(), &AnimTimer::ticked, this, [this]() {
        m_view->viewport()->update();
    });

    connect(m_view, &ChatView::animationTriggered, AnimTimer::instance(), &AnimTimer::play);

    m_readDebounce = new QTimer(this);
    m_readDebounce->setSingleShot(true);
    m_readDebounce->setInterval(300);
    connect(m_readDebounce, &QTimer::timeout, this, &MessageList::updateReadPosition);
    connect(m_view->verticalScrollBar(), &QScrollBar::valueChanged,
            m_readDebounce, QOverload<>::of(&QTimer::start));
}

void MessageList::loadChannel(const QString& channelId) {
    QWidget* prevFocus = QApplication::focusWidget();

    bool sameChannel = (m_currentChannelId == channelId);

    /* Save state of current channel before switching */
    if (!m_currentChannelId.isEmpty()) {
        if (!sameChannel) {
            saveChannelState();
            /* выключаем рацию предыдущего канала при переключении (деактивирует подписку в core) */
            if (m_radioOn) {
                onRadioToggled(false);
                m_radioBtn->blockSignals(true);
                m_radioBtn->setChecked(false);
                m_radioBtn->blockSignals(false);
            }
            m_talkingLabel->hide();
        } else {
            QModelIndex topIdx = m_view->indexAt(QPoint(0, 0));
            m_savedTopMsgId = topIdx.isValid() ? topIdx.data(MsgIdRole).toLongLong() : 0;
            QScrollBar* sb = m_view->verticalScrollBar();
            m_wasAtBottom = sb && (sb->value() >= sb->maximum());
        }
    }

    if (!sameChannel) m_historyAnchor.clear();
    m_view->setHistoricalWindow(!m_historyAnchor.isEmpty());
    m_model->clear();
    m_avatarCache.clear();
    if (m_currentChannelId != channelId) { m_feedback.clear(); m_pendingPoll.clear(); }
    m_currentChannelId = channelId;
    m_pollBtn->setVisible(!isDmChannel(channelId));
    clearDmCallRoute();
    m_callBtn->setVisible(isDmChannel(channelId));
    m_inviteBtn->setVisible(isDmChannel(channelId));
    m_peerStatus->setVisible(isDmChannel(channelId));
    m_radioBtn->setVisible(!isDmChannel(channelId));
    m_inputBar->setRecordingContext(m_db ? m_db->dbPath() + "/media" : QString(), channelId);
    m_readDebounce->stop();

    /* шапка: название канала */
    QString title = channelId;
    if (m_db && !isDmChannel(channelId)) {
        for (const auto& ch : m_db->getChannels()) {
            if (ch.channelId == channelId) { title = ch.name; break; }
        }
    }
    if (m_channelTitle) m_channelTitle->setText(title);

    m_inputBar->setDmMode(isDmChannel(channelId));
    /* История и состояния PM поступают из ядра в одном снимке. */
    if (isDmChannel(channelId)) {
        m_radioBtn->setEnabled(false);
        if (m_db) {
            for (const auto& conv : m_db->getDmConversations()) {
                if (conv.convId != dmConvId(channelId)) continue;
                QString name = m_db->getDisplayName(conv.peerNodeId);
                if (name.isEmpty()) name = conv.peerName;
                if (name.isEmpty()) name = QStringLiteral("0x%1").arg(conv.peerNodeId, 16, 16, QChar('0'));
                m_channelTitle->setText(name);
                break;
            }
        }
        refreshDmCallRoute();
        requestDmMessages(channelId);
        if (prevFocus)
            prevFocus->setFocus();
        else
            m_inputBar->setFocus();
        return;
    }
    m_radioBtn->setEnabled(true);
    m_inputBar->setMediaEnabled(true);

    if (!m_db || !m_db->isOpen()) return;

    m_localNicks = m_db->getLocalNicknames(channelId);

    auto msgs = m_db->getMessages(channelId, 200, m_historyAnchor);

    for (const auto& m : msgs) {
        AccountRow acc = m_db->getAccount(m.authorNodeId);
        QString author  = authorName(m.authorNodeId);
        QString letter  = acc.avatarLetter.isEmpty() ? author.mid(0, 1) : acc.avatarLetter;
        QColor  color(acc.avatarColor);

        if (!m_avatarCache.contains(m.authorNodeId)) {
            m_avatarCache[m.authorNodeId] = color;
        }

        auto avatar = makeAvatar(color, letter);
        if (auto* manager = AvatarManager::instance()) {
            const QImage image = manager->image(m_currentChannelId, m.authorNodeId);
            if (!image.isNull()) avatar = QPixmap::fromImage(image);
        }
        auto time   = QDateTime::fromMSecsSinceEpoch(m.timestamp).toString("HH:mm");

        QVariantList reacts;
        auto *item = new QStandardItem();
        setMsg(item, author, QString::fromUtf8(m.data), time, avatar, false,
               false, QString(), QString(), reacts);
        item->setData(m.id, MsgIdRole);
        item->setData(QVariant::fromValue(m.authorNodeId), MsgAuthorNodeIdRole);
        item->setData(m.isOutgoing ? 1 : 0, MsgIsOutgoingRole);
        setVoiceMessageRoles(item, m.data, m.contentType,
                              m_db ? m_db->dbPath() + "/media" : QString(), channelId, m.localAttrs);
        m_model->appendRow(item);
        setupFeedback(item, m, channelId);
        updateReply(item, m.replyTo);
    }

    if (sameChannel) {
        bool wasBottom = m_wasAtBottom;
        qint64 savedTop = m_savedTopMsgId;
        QTimer::singleShot(0, this, [this, wasBottom, savedTop]() {
            if (wasBottom || savedTop == 0) {
                m_view->scrollToBottom();
            } else {
                for (int row = 0; row < m_model->rowCount(); row++) {
                    if (m_model->item(row)->data(MsgIdRole).toLongLong() == savedTop) {
                        m_view->scrollTo(m_model->index(row, 0), QAbstractItemView::PositionAtTop);
                        break;
                    }
                }
            }
            m_readDebounce->start();
        });
    } else {
        m_lastReadMsgId = m_db->getUiStateInt64(
            QStringLiteral("ch_%1_last_read").arg(channelId), 0);
        restoreScrollPosition(channelId);
        m_readDebounce->start();
    }

    if (prevFocus)
        prevFocus->setFocus();
    else
        m_inputBar->setFocus();
}

void MessageList::refresh() {
    if (m_currentChannelId.isEmpty()) return;

    if (isDmChannel(m_currentChannelId)) {
        requestDmMessages(m_currentChannelId);
        return;
    }

    if (!m_db || !m_db->isOpen()) return;

    refreshReplies();
    if (!m_historyAnchor.isEmpty()) return;
    QSet<QString> present;
    for (int row = 0; row < m_model->rowCount(); row++) present.insert(m_model->item(row)->data(MsgMessageKeyRole).toString());
    auto newMsgs = m_db->getMessages(m_currentChannelId, 200);
    if (newMsgs.isEmpty()) return;

    m_localNicks = m_db->getLocalNicknames(m_currentChannelId);

    QScrollBar* sb = m_view->verticalScrollBar();
    bool wasAtBottom = sb && (sb->value() >= sb->maximum());

    for (const auto& m : newMsgs) {
        if (present.contains(QString::fromLatin1(m.messageId.toHex()))) continue;
        AccountRow acc = m_db->getAccount(m.authorNodeId);
        QString author  = authorName(m.authorNodeId);
        QString letter  = acc.avatarLetter.isEmpty() ? author.mid(0, 1) : acc.avatarLetter;
        QColor  color(acc.avatarColor);
        if (!m_avatarCache.contains(m.authorNodeId))
            m_avatarCache[m.authorNodeId] = color;
        auto avatar = makeAvatar(color, letter);
        if (auto* manager = AvatarManager::instance()) {
            const QImage image = manager->image(m_currentChannelId, m.authorNodeId);
            if (!image.isNull()) avatar = QPixmap::fromImage(image);
        }
        auto time   = QDateTime::fromMSecsSinceEpoch(m.timestamp).toString("HH:mm");
        auto *item = new QStandardItem();
        setMsg(item, author, QString::fromUtf8(m.data), time, avatar, false,
               false, QString(), QString(), QVariantList{});
        item->setData(m.id, MsgIdRole);
        item->setData(QVariant::fromValue(m.authorNodeId), MsgAuthorNodeIdRole);
        item->setData(m.isOutgoing ? 1 : 0, MsgIsOutgoingRole);
        setVoiceMessageRoles(item, m.data, m.contentType,
                              m_db ? m_db->dbPath() + "/media" : QString(), m_currentChannelId, m.localAttrs);
        m_model->appendRow(item);
        setupFeedback(item, m, m_currentChannelId);
        updateReply(item, m.replyTo);
        while (m_model->rowCount() > 200)
            m_model->removeRow(0);
    }

    m_model->setSortRole(MsgRawTimestampRole); m_model->sort(0);
    if (wasAtBottom) m_view->scrollToBottom();
    m_readDebounce->start();
}

void MessageList::saveChannelState() {
    if (!m_historyAnchor.isEmpty()) return; // Просмотр цитаты сохраняет прежнюю позицию чтения свежей истории.
    if (m_currentChannelId.isEmpty() || m_model->rowCount() == 0) return;

    QScrollBar* sb = m_view->verticalScrollBar();
    bool atBottom = sb && (sb->value() >= sb->maximum());

    qint64 lastPosMsgId  = 0;
    if (!atBottom) {
        QModelIndex topIdx = m_view->indexAt(QPoint(0, 0));
        if (topIdx.isValid())
            lastPosMsgId = topIdx.data(MsgIdRole).toLongLong();
    }

    qint64 lastReadMsgId = m_lastReadMsgId;
    DEBUG_DEBUG(DEBUG_CATEGORY_CHAT, "MessageList::saveChannelState ch=%s bottom=%d read=%lld pos=%lld",
                qPrintable(m_currentChannelId), (int)atBottom, (long long)lastReadMsgId, (long long)lastPosMsgId);

    QByteArray cid = m_currentChannelId.toUtf8();
    auto postSaveKey = [&cid](const char* suffix, qint64 val) {
        QByteArray key = "ch_" + cid + suffix;
        QByteArray valStr = QByteArray::number(val);
        size_t keyLen = (size_t)key.size(), valLen = (size_t)valStr.size();
        size_t total = keyLen + 1 + valLen + 1;
        if (total > 256) return;
        struct save_ui_state_arg* arg = (struct save_ui_state_arg*)u_malloc(sizeof(struct save_ui_state_arg));
        if (!arg) return;
        arg->inst = gui_bridge_get_inst();
        memcpy(arg->data, key.constData(), keyLen + 1);
        memcpy(arg->data + keyLen + 1, valStr.constData(), valLen + 1);
        gui_bridge_post_uasync_fn(chat_core_save_ui_state_trampoline, arg);
    };

    if (lastReadMsgId > 0)
        postSaveKey("_last_read", lastReadMsgId);
    postSaveKey("_last_pos", lastPosMsgId);
}

QString MessageList::authorName(quint64 nodeId) const {
    auto it = m_localNicks.find(nodeId);
    if (it != m_localNicks.end() && !it->isEmpty()) return *it;
    return m_db->getDisplayName(nodeId);
}

void MessageList::reloadLocalNicks() {
    if (m_currentChannelId.isEmpty() || !m_db) return;
    m_localNicks = m_db->getLocalNicknames(m_currentChannelId);
    for (int r = 0; r < m_model->rowCount(); r++) {
        auto* item = m_model->item(r);
        if (!item) continue;
        QVariant v = item->data(MsgAuthorNodeIdRole);
        if (!v.isValid()) continue;
        quint64 nid = v.value<quint64>();
        item->setData(authorName(nid), MsgAuthorRole);
    }
    if (!isDmChannel(m_currentChannelId)) refreshReplies();
    m_view->viewport()->update();
}

void MessageList::restoreScrollPosition(const QString& channelId) {
    if (!m_db || m_model->rowCount() == 0) {
        return;
    }

    qint64 lastPosMsgId = m_db->getUiStateInt64(
        QStringLiteral("ch_%1_last_pos").arg(channelId), 0);

    if (lastPosMsgId > 0) {
        for (int row = 0; row < m_model->rowCount(); row++) {
            QStandardItem* item = m_model->item(row);
            if (item && item->data(MsgIdRole).toLongLong() == lastPosMsgId) {
                m_view->scrollTo(m_model->index(row, 0), QAbstractItemView::PositionAtTop);
                return;
            }
        }
    }

    m_view->scrollToBottom();
}

void MessageList::updateReadPosition() {
    if (!m_historyAnchor.isEmpty()) return;
    if (m_currentChannelId.isEmpty() || m_model->rowCount() == 0) return;

    int vpHeight = m_view->viewport()->height();
    int lastFullyVisibleRow = -1;
    qint64 newReadMsgId = m_lastReadMsgId;

    for (int row = m_model->rowCount() - 1; row >= 0; --row) {
        QModelIndex idx = m_model->index(row, 0);
        QRect vr = m_view->visualRect(idx);
        if (vr.isValid() && vr.bottom() <= vpHeight) {
            lastFullyVisibleRow = row;
            break;
        }
    }

    if (lastFullyVisibleRow >= 0) {
        qint64 msgId = m_model->item(lastFullyVisibleRow)->data(MsgIdRole).toLongLong();
        if (msgId > m_lastReadMsgId)
            newReadMsgId = msgId;
    }

    QModelIndex topIdx = m_view->indexAt(QPoint(0, 0));
    QScrollBar* sb = m_view->verticalScrollBar();
    bool atBottom = sb && (sb->value() >= sb->maximum());
    qint64 lastPosMsgId = (!atBottom && topIdx.isValid()) ? topIdx.data(MsgIdRole).toLongLong() : 0;

    DEBUG_DEBUG(DEBUG_CATEGORY_CHAT,
        "MessageList::updateReadPosition ch=%s oldRead=%lld newRead=%lld pos=%lld bottom=%d lastVisRow=%d/%d",
        qPrintable(m_currentChannelId), (long long)m_lastReadMsgId,
        (long long)newReadMsgId, (long long)lastPosMsgId, (int)atBottom,
        lastFullyVisibleRow, m_model->rowCount());

    QByteArray cid = m_currentChannelId.toUtf8();
    auto postSaveKey = [&cid](const char* suffix, qint64 val) {
        QByteArray key = "ch_" + cid + suffix;
        QByteArray valStr = QByteArray::number(val);
        size_t keyLen = (size_t)key.size(), valLen = (size_t)valStr.size();
        size_t total = keyLen + 1 + valLen + 1;
        if (total > 256) return;
        struct save_ui_state_arg* arg = (struct save_ui_state_arg*)u_malloc(sizeof(struct save_ui_state_arg));
        if (!arg) return;
        arg->inst = gui_bridge_get_inst();
        memcpy(arg->data, key.constData(), keyLen + 1);
        memcpy(arg->data + keyLen + 1, valStr.constData(), valLen + 1);
        gui_bridge_post_uasync_fn(chat_core_save_ui_state_trampoline, arg);
    };

    if (newReadMsgId > m_lastReadMsgId) {
        m_lastReadMsgId = newReadMsgId;
        postSaveKey("_last_read", m_lastReadMsgId);
        emit readPositionChanged(m_currentChannelId, m_lastReadMsgId);
    }

    postSaveKey("_last_pos", lastPosMsgId);
}

void MessageList::cleanupAnimations() {
    size_t n = s_icons.size();
    DEBUG_DEBUG(DEBUG_CATEGORY_GENERAL, "MessageList: cleanupAnimations clearing %zu icons", n);
    s_icons.clear();
    DEBUG_DEBUG(DEBUG_CATEGORY_GENERAL, "MessageList: cleanupAnimations done");
}

void MessageList::updateMessageProgress(const QString& chId, int64_t msgId,
                                         int blocksDone, int numBlocks) {
    if (chId != m_currentChannelId) return;
    for (int r = 0; r < m_model->rowCount(); r++) {
        QStandardItem* item = m_model->item(r);
        if (!item) continue;
        if (item->data(MsgIdRole).toLongLong() == msgId) {
            item->setData(blocksDone, MsgMediaBlocksDoneRole);
            item->setData(numBlocks, MsgMediaNumBlocksRole);
            item->setData(1, MsgFileDownloadStateRole);
            m_view->viewport()->update();
            return;
        }
    }
}

void MessageList::onAttachmentDownloaded(const QString& chId, int64_t msgId) {
    if (chId != m_currentChannelId || !m_db || !m_db->isOpen()) return;

    MessageRow m = m_db->getMessageById(chId, msgId);
    if (m.id == 0) return;

    int row = -1;
    bool wasPending = false;
    for (int r = 0; r < m_model->rowCount(); r++) {
        QStandardItem* it = m_model->item(r);
        if (it && it->data(MsgIdRole).toLongLong() == msgId) {
            row = r;
            wasPending = it->data(MsgVoiceDownloadPendingRole).toBool();
            break;
        }
    }
    if (row < 0) return;

    QStandardItem* item = m_model->item(row);
    setVoiceMessageRoles(item, m.data, m.contentType,
                         m_db->dbPath() + "/media", chId, m.localAttrs);
    item->setData(0, MsgMediaBlocksDoneRole);
    item->setData(false, MsgVoiceDownloadPendingRole);

    if (m.contentType == "audio/opus" && wasPending) {
        QString fp = item->data(MsgVoiceFileRole).toString();
        if (!fp.isEmpty() && QFile::exists(fp)) {
            QTimer::singleShot(500, this, [this, fp]() {
                MessageDelegate::stopAllAutoPlay();
                VoicePlayer::playOpusFile(fp, this, [fp](float actualDur, uint64_t playbackId) { MessageDelegate::startAutoPlay(fp, actualDur, playbackId); });
            });
        }
    }

    if (m.contentType == "video/mp4") prepareVideoThumbnail(item->data(MsgVoiceFileRole).toString());
}

/* Общие превью для каналов/PM; не более двух decoder workers, без запуска из paint. */
void MessageList::prepareVideoThumbnail(const QString& path) {
    if (path.isEmpty() || m_thumbnailJobs.contains(path) || !QFile::exists(path) || QFile::exists(path + ".jpg")) return;
    m_thumbnailPool.setMaxThreadCount(2);
    m_thumbnailJobs.insert(path);
    QPointer<MessageList> self(this);
    QObject* dispatcher = QCoreApplication::instance();
    m_thumbnailPool.start([self, dispatcher, path]() {
        QString output = path + ".jpg";
        int rc = video_extract_thumbnail(path.toUtf8().constData(), output.toUtf8().constData(), 320);
        if (rc) DEBUG_WARN(DEBUG_CATEGORY_VIDEO, "thumbnail failed path=%s error=%d", qPrintable(path), rc);
        else DEBUG_DEBUG(DEBUG_CATEGORY_VIDEO, "thumbnail ready path=%s", qPrintable(output));
        QMetaObject::invokeMethod(dispatcher, [self, path]() {
            if (!self) return;
            self->m_thumbnailJobs.remove(path);
            self->m_view->viewport()->update();
        }, Qt::QueuedConnection);
    });
}

/* Цитаты разрешаются независимо от окна истории; поздняя синхронизация обновляет уже видимые ответы. */
void MessageList::updateReply(QStandardItem* item, const QByteArray& original) {
    item->setData(QString::fromLatin1(original.toHex()), MsgReplyToRole);
    item->setData(!original.isEmpty(), MsgHasQuoteRole);
    if (original.isEmpty() || !m_db) return;
    const auto message = m_db->getMessageByKey(m_currentChannelId, original);
    const QString author = message.messageId.isEmpty() ? QCoreApplication::translate("ChatGui", "Reply") : authorName(message.authorNodeId);
    const QString preview = message.messageId.isEmpty()
        ? QCoreApplication::translate("ChatGui", "Original message is not available yet") : DbManager::messagePreview(message);
    if (item->data(MsgQuoteAuthorRole).toString() == author && item->data(MsgQuoteTextRole).toString() == preview) return;
    item->setData(author, MsgQuoteAuthorRole); item->setData(preview, MsgQuoteTextRole);
    GUI_DEBUG("reply: preview ch=%s original=%s resolved=%d", qPrintable(m_currentChannelId), original.toHex().constData(),
              !message.messageId.isEmpty());
}

void MessageList::refreshReplies() {
    for (int row = 0; row < m_model->rowCount(); ++row) {
        auto* item = m_model->item(row);
        const QByteArray key = QByteArray::fromHex(item->data(MsgReplyToRole).toString().toLatin1());
        if (!key.isEmpty()) updateReply(item, key);
    }
}

/* Перезагружаем только ограниченное окно вокруг цели; обычный refresh сохраняет открытый участок истории. */
void MessageList::jumpToMessage(const QString& messageId) {
    if (!m_db || isDmChannel(m_currentChannelId)) return;
    const QByteArray key = QByteArray::fromHex(messageId.toLatin1());
    if (key.size() != 32) { GUI_ERROR("reply: invalid navigation key=%s", qPrintable(messageId)); return; }
    bool present = false;
    for (int row = 0; row < m_model->rowCount(); ++row)
        if (m_model->item(row)->data(MsgMessageKeyRole).toString() == messageId) { present = true; break; }
    if (!present) {
        if (m_db->getMessageByKey(m_currentChannelId, key).messageId.isEmpty()) {
            GUI_WARN("reply: navigation original unavailable ch=%s id=%s", qPrintable(m_currentChannelId), qPrintable(messageId));
            QToolTip::showText(QCursor::pos(), QCoreApplication::translate("ChatGui", "Original message is not available yet"), m_view);
            return;
        }
        m_historyAnchor = key;
        loadChannel(m_currentChannelId);
    }
    GUI_DEBUG("reply: navigate ch=%s id=%s loaded_window=%d", qPrintable(m_currentChannelId), qPrintable(messageId), !present);
    const QString channel = m_currentChannelId;
    QTimer::singleShot(0, this, [this, channel, messageId]() {
        if (channel != m_currentChannelId) return;
        for (int row = 0; row < m_model->rowCount(); ++row) {
            const QModelIndex index = m_model->index(row, 0);
            if (index.data(MsgMessageKeyRole).toString() != messageId) continue;
            m_view->scrollTo(index, QAbstractItemView::PositionAtCenter);
            m_model->setData(index, true, MsgHighlightRole);
            QTimer::singleShot(1500, this, [this, index = QPersistentModelIndex(index)]() {
                if (index.isValid()) m_model->setData(index, false, MsgHighlightRole);
            });
            return;
        }
        GUI_WARN("reply: navigation target disappeared ch=%s id=%s", qPrintable(channel), qPrintable(messageId));
    });
}

void MessageList::onMessageSubmitted(const uint8_t* data, int len) {
    if (!data || len != 9 || data[8] > 1) { GUI_ERROR("reply: invalid submission result bytes=%d", len); return; }
    quint64 request = 0;
    for (unsigned i = 0; i < 8; ++i) request |= quint64(data[i]) << (8 * i);
    m_inputBar->submissionResult(request, data[8] != 0);
}

void MessageList::onMessageContextMenu(const QPoint& pos) {
    QModelIndex idx = m_view->indexAt(pos);
    if (!idx.isValid()) return;

    QString ct = idx.data(MsgContentTypeRole).toString();
    bool isVideo = (ct == "video/mp4");
    bool isImage = ct.startsWith("image/");
    bool isDmFile = isDmChannel(idx.data(MsgChannelIdRole).toString()) && ct == "application/octet-stream";
    bool isDm = isDmChannel(idx.data(MsgChannelIdRole).toString());

    QString filePath = idx.data(MsgVoiceFileRole).toString();
    QString displayName = idx.data(MsgFileDisplayNameRole).toString();
    bool downloaded = !filePath.isEmpty() && QFile::exists(filePath);

    QMenu menu(m_view);
    QString messageId = idx.data(MsgMessageKeyRole).toString();
    if (!isDm && messageId.size() == 64) {
        const QString channel = idx.data(MsgChannelIdRole).toString();
        connect(menu.addAction(QCoreApplication::translate("ChatGui", "Reply")), &QAction::triggered, this, [this, channel, messageId]() {
            if (channel != m_currentChannelId || !m_db) return;
            const auto original = m_db->getMessageByKey(channel, QByteArray::fromHex(messageId.toLatin1()));
            if (original.messageId.isEmpty()) { GUI_WARN("reply: selected original disappeared ch=%s", qPrintable(channel)); return; }
            m_inputBar->setReply(original.messageId, authorName(original.authorNodeId), DbManager::messagePreview(original));
        });
        if (ct == "poll") connect(menu.addAction(QCoreApplication::translate("ChatGui", "Vote / results")), &QAction::triggered,
            this, [this, messageId]() { showPoll(messageId); });
        auto* reactions = menu.addMenu(QCoreApplication::translate("ChatGui", "React"));
        addReactionActions(reactions, idx.data(MsgChannelIdRole).toString(), messageId);
        connect(menu.addAction(QCoreApplication::translate("ChatGui", "Clear reactions")), &QAction::triggered,
            this, [this, messageId]() { sendFeedback({{"cmd", "react"}, {"message_id", messageId}, {"clear", true}}); });
    }
    QAction* saveAct = nullptr;
    if (isVideo || isImage || isDmFile) {
        saveAct = menu.addAction(QCoreApplication::translate("ChatGui", "Save to file")); saveAct->setEnabled(downloaded);
    }
    QAction* dlAct = nullptr;
    if ((isVideo || isImage) && !downloaded && !isDm) dlAct = menu.addAction(QCoreApplication::translate("ChatGui", "Download"));

    QAction* chosen = menu.exec(m_view->viewport()->mapToGlobal(pos));

    if (saveAct && chosen == saveAct) {
        QString base = displayName;
        if (base.isEmpty()) base = QFileInfo(filePath).fileName();
        QString dest = QFileDialog::getSaveFileName(this, QCoreApplication::translate("ChatGui", "Save file"), base);
        if (dest.isEmpty()) return;
        std::thread([filePath, dest]() {
            if (!QFile::copy(filePath, dest))
                DEBUG_ERROR(DEBUG_CATEGORY_GENERAL, "MessageList: save failed src=%s dst=%s", qPrintable(filePath), qPrintable(dest));
            else DEBUG_INFO(DEBUG_CATEGORY_GENERAL, "MessageList: saved %s -> %s", qPrintable(filePath), qPrintable(dest));
        }).detach();
        return;
    }

    if (dlAct && chosen == dlAct) {
        qint64 msgId = idx.data(MsgIdRole).toLongLong();
        QString chId = idx.data(MsgChannelIdRole).toString();
        if (chId.isEmpty() || msgId <= 0) return;
        struct attachment_dl_req* req = (struct attachment_dl_req*)
            u_malloc(sizeof(struct attachment_dl_req));
        if (!req) return;
        memset(req, 0, sizeof(*req));
        req->inst = gui_bridge_get_inst();
        strncpy(req->channel_id, chId.toUtf8().constData(), sizeof(req->channel_id) - 1);
        req->msg_id = msgId;
        gui_bridge_post_uasync_fn(chat_core_attachment_download_trampoline, req);
    }
}

/* ── DM (p2p чат) ── */

void MessageList::clearDmCallRoute() {
    m_callPeer = 0; m_callGroup = 0;
    m_callBtn->setEnabled(false);
    m_callBtn->setToolTip(QCoreApplication::translate("ChatGui", "Peer unavailable"));
    m_peerStatus->setStyleSheet("background: #E53935; border-radius: 6px;");
    m_peerStatus->setToolTip(QCoreApplication::translate("ChatGui", "Offline"));
}

void MessageList::refreshDmCallRoute() {
    if (!isDmChannel(m_currentChannelId)) return;
    auto* inst = gui_bridge_get_inst();
    if (!inst) { clearDmCallRoute(); return; }
    auto* req = (struct dm_messages_req*)u_calloc(1, sizeof(struct dm_messages_req));
    if (!req) { DEBUG_ERROR(DEBUG_CATEGORY_CALL, "PM route request: allocation failed"); clearDmCallRoute(); return; }
    req->inst = inst;
    QByteArray conv = dmConvId(m_currentChannelId).toUtf8();
    snprintf(req->conv_id, sizeof(req->conv_id), "%s", conv.constData());
    gui_bridge_post_uasync_fn(dm_call_route_trampoline, req);
}

void MessageList::onDmCallRoute(const uint8_t* data, int len) {
    if (!data || len < 17 || len != 17 + data[0]) {
        DEBUG_WARN(DEBUG_CATEGORY_CALL, "PM route snapshot: invalid size=%d", len); return;
    }
    QString conv = QString::fromUtf8((const char*)data + 1, data[0]);
    if (m_currentChannelId != QStringLiteral("dm:") + conv) return;
    quint64 peer = 0, group = 0;
    memcpy(&peer, data + 1 + data[0], 8);
    memcpy(&group, data + 9 + data[0], 8);
    if (m_callPeer != peer || m_callGroup != group)
        DEBUG_INFO(DEBUG_CATEGORY_CALL, "PM button: conv=%s peer=%llu group=%llu enabled=%d",
                   conv.toUtf8().constData(), (unsigned long long)peer, (unsigned long long)group, peer && group);
    m_callPeer = peer; m_callGroup = group;
    m_callBtn->setEnabled(peer && group);
    m_peerStatus->setStyleSheet(group ? "background: #4CAF50; border-radius: 6px;" : "background: #E53935; border-radius: 6px;");
    m_peerStatus->setToolTip(group ? QCoreApplication::translate("ChatGui", "Online") : QCoreApplication::translate("ChatGui", "Offline"));
    m_callBtn->setToolTip(group ? QCoreApplication::translate("ChatGui", "Call peer") : QCoreApplication::translate("ChatGui", "Peer unavailable"));
}

bool MessageList::isDmChannel(const QString& channelId) {
    return channelId.startsWith(QStringLiteral("dm:"));
}

QString MessageList::dmConvId(const QString& channelId) {
    return channelId.mid(3);
}

void MessageList::requestDmMessages(const QString& channelId) {
    QString conv = dmConvId(channelId);
    struct dm_messages_req* req = (struct dm_messages_req*)u_malloc(sizeof(*req));
    if (!req) return;
    memset(req, 0, sizeof(*req));
    req->inst = gui_bridge_get_inst();
    strncpy(req->conv_id, conv.toUtf8().constData(), sizeof(req->conv_id) - 1);
    gui_bridge_post_uasync_fn(dm_messages_trampoline, req);
}

void MessageList::onAttachmentPreparation(const uint8_t* data, int len) {
    if (!data || len < 18 || len != 18 + data[0] || data[len - 1] > 2) {
        DEBUG_ERROR(DEBUG_CATEGORY_MEDIA, "Invalid attachment preparation event bytes=%d", len); return;
    }
    int length = data[0];
    m_inputBar->updatePreparation(QString::fromUtf8((const char*)data + 1, length),
        QByteArray((const char*)data + 1 + length, 16), data[len - 1]);
}

void MessageList::onDmMessages(const uint8_t* data, int len) {
    if (len < 3) return;
    uint8_t cl = data[0];
    if (len < 1 + (int)cl + 2) return;
    QString convId = QString::fromUtf8((const char*)data + 1, cl);
    if (m_currentChannelId != QStringLiteral("dm:") + convId) return; /* stale response */

    QJsonParseError error;
    auto document = QJsonDocument::fromJson(QByteArray((const char*)data + 1 + cl, len - 1 - cl), &error);
    if (error.error != QJsonParseError::NoError || !document.isArray()) {
        DEBUG_ERROR(DEBUG_CATEGORY_DM, "Invalid PM history JSON: %s", qPrintable(error.errorString())); return;
    }
    auto* scrollbar = m_view->verticalScrollBar();
    bool atBottom = m_model->rowCount() == 0 || scrollbar->value() >= scrollbar->maximum();
    int previousScroll = scrollbar->value();
    m_model->clear();
    m_avatarCache.clear();

    for (const auto& entry : document.array()) {
        auto message = entry.toObject();
        int dir = message.value("dir").toInt();
        qint64 seq = (qint64)message.value("seq").toDouble();
        qint64 ts = (qint64)message.value("ts").toDouble();
        quint64 author = message.value("author").toString().toULongLong();
        QString text = message.value("data").toString();
        const bool invite = message.value("ct").toString() == QStringLiteral("invite");
        const QString inviteLink = invite ? text : QString();
        if (invite) {
            const QString groupName = message.value("tags").toObject().value("group_name").toString();
            text = QCoreApplication::translate("ChatGui", "Invitation to group “%1”").arg(groupName) + '\n' + inviteLink;
            GUI_DEBUG("invite PM: rendered conv=%s seq=%lld group_name_bytes=%d link_bytes=%d", qPrintable(m_currentChannelId),
                      (long long)seq, (int)groupName.toUtf8().size(), (int)inviteLink.size());
        }
        bool file = message.value("ct").toString() == "file";
        QString state = message.value("media_status").toString();
        QString status;
        if (file) {
            if (state == "delivered") status = QCoreApplication::translate("ChatGui", "Delivered");
            else if (state == "expired") status = QCoreApplication::translate("ChatGui", "Storage period expired");
            else if (dir == 1) status = QCoreApplication::translate("ChatGui", "Awaiting delivery");
            else if (state == "ready") status = QCoreApplication::translate("ChatGui", "Received");
            else status = QCoreApplication::translate("ChatGui", "Downloading…");
        } else if (dir == 1) status = message.value("pending").toBool() ? QCoreApplication::translate("ChatGui",
            "Awaiting delivery") : QCoreApplication::translate("ChatGui",
            "Delivered");

        AccountRow acc = m_db ? m_db->getAccount(author) : AccountRow();
        QString name = authorName(author);
        QString letter = acc.avatarLetter.isEmpty() ? name.mid(0, 1) : acc.avatarLetter;
        QColor color(acc.avatarColor);
        if (!m_avatarCache.contains(author))
            m_avatarCache[author] = color;
        auto avatar = makeAvatar(color, letter);
        if (auto* manager = AvatarManager::instance()) {
            const QImage image = manager->image(m_currentChannelId, author);
            if (!image.isNull()) avatar = QPixmap::fromImage(image);
        }
        auto time = QDateTime::fromMSecsSinceEpoch((qint64)ts).toString("HH:mm");
        if (!file && !status.isEmpty()) time += QStringLiteral(" · ") + status;

        auto *item = new QStandardItem();
        setMsg(item, name, text, time, avatar, false,
               false, QString(), QString(), QVariantList{});
        item->setData((qint64)seq, MsgIdRole);
        item->setData(QVariant::fromValue(author), MsgAuthorNodeIdRole);
        item->setData(dir == 1 ? 1 : 0, MsgIsOutgoingRole);
        item->setData(m_currentChannelId, MsgChannelIdRole);
        QString type = message.value("content_type").toString(QStringLiteral("text/plain"));
        item->setData(type, MsgContentTypeRole);
        if (invite) item->setData(inviteLink, MsgInviteLinkRole);
        if (file) {
            QString path = message.value("media_path").toString();
            item->setData(path, MsgVoiceFileRole);
            item->setData(text, MsgFileDisplayNameRole);
            item->setData((qint64)message.value("media_size").toDouble(), MsgFileSizeRole);
            item->setData(path.isEmpty() ? (state == "expired" ? 0 : 1) : 2, MsgFileDownloadStateRole);
            item->setData(status, MsgDeliveryStateRole);
            int duration = message.value("duration_ms").toInt();
            if (type == "audio/opus") {
                item->setData(QString::number(duration / 1000.0, 'f', 1) + "s", MsgVoiceDurationRole);
                item->setData((qint64)message.value("media_size").toDouble(), MsgVoiceFileSizeRole);
                QVariantList waveform;
                const QString levels = QStringLiteral("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/");
                for (QChar level : message.value("waveform").toString()) waveform.append(qMax(0, levels.indexOf(level)) / 63.0);
                item->setData(waveform, MsgVoiceWaveformRole);
            } else if (type == "video/mp4") {
                item->setData(duration, MsgVideoDurationMsRole);
                item->setData(message.value("width").toInt(), MsgVideoWidthRole);
                item->setData(message.value("height").toInt(), MsgVideoHeightRole);
                prepareVideoThumbnail(path);
            }
        }
        m_model->appendRow(item);
    }

    if (atBottom) m_view->scrollToBottom();
    else scrollbar->setValue(previousScroll);
}

/* ── рация ── */

void MessageList::onRadioTalk(quint64 groupId, quint64 srcNodeId, bool on) {
    if (m_currentChannelId.isEmpty()) return;
    if (groupId != m_currentChannelId.toULongLong()) return;
    if (!m_talkingLabel) return;
    if (on) {
        QString name = authorName(srcNodeId);
        if (name.isEmpty()) name = QStringLiteral("0x%1").arg(srcNodeId, 0, 16);
        m_talkingLabel->setText(QCoreApplication::translate("ChatGui", "🎙 %1 is speaking").arg(name));
        m_talkingLabel->show();
    } else {
        m_talkingLabel->hide();
    }
}

void MessageList::onRadioToggled(bool on) {
    if (m_currentChannelId.isEmpty() || isDmChannel(m_currentChannelId)) return;

    quint64 groupId = m_currentChannelId.toULongLong();
    if (groupId == 0) return;

    struct radio_set_active_arg* a = (struct radio_set_active_arg*)u_malloc(sizeof(*a));
    if (!a) {
        DEBUG_ERROR(DEBUG_CATEGORY_RADIO, "RadioPanel: active request allocation failed group=%016llx", (unsigned long long)groupId);
        QSignalBlocker blocker(m_radioBtn);
        m_radioBtn->setChecked(m_radioOn);
        return;
    }
    a->inst = gui_bridge_get_inst();
    a->group_id = groupId;
    a->on = on ? 1 : 0;
    gui_bridge_post_uasync_fn(radio_set_active_trampoline, a);

    if (on) {
        if (RadioAudioEngine::instance()->start(groupId) != 0) {
            DEBUG_ERROR(DEBUG_CATEGORY_RADIO, "RadioPanel: radio start failed group=%016llx", (unsigned long long)groupId);
            auto* undo = static_cast<radio_set_active_arg*>(u_calloc(1, sizeof(radio_set_active_arg)));
            if (undo) {
                undo->inst = gui_bridge_get_inst(); undo->group_id = groupId;
                gui_bridge_post_uasync_fn(radio_set_active_trampoline, undo);
            } else DEBUG_ERROR(DEBUG_CATEGORY_RADIO, "RadioPanel: cannot cancel failed radio subscription");
            QSignalBlocker blocker(m_radioBtn);
            m_radioBtn->setChecked(false);
            return;
        }
    } else {
        RadioAudioEngine::instance()->stop();
        m_talkingLabel->hide();
    }
    m_radioOn = on;
    updateRadioUi();
}

void MessageList::updateRadioUi() {
    bool show = m_radioOn && !isDmChannel(m_currentChannelId);
    m_radioPanel->setVisible(show);
}