#include "mainwindow.h"
#include "channellist.h"
#include "messagelist.h"
#include "accountlist.h"
#include "invitedialog.h"
#include "joindialog.h"
#include "settingsdialog.h"
#include "creategroupdialog.h"
#include "invite_link.h"
#include "sound_manager.h"
#include "audiorecorder.h"
#include "audiocompressor.h"
#include "voicemessageencoder.h"
#include "animtimer.h"
#include "../db/db_manager.h"
#include "../transport/utun_node.h"
#include "../transport/gui_bridge.h"
#include <QSplitter>
#include <QCloseEvent>
#include <QApplication>
#include <QClipboard>
#include <QStyle>
#include <QMessageBox>
#include <QDebug>
#include <QSettings>
#include <QFile>
#include <QTextStream>
#include <QDir>
#include <cmath>

extern "C" {
#include "../transport/chat_core.h"
#include "../../lib/mem.h"
#include "../../lib/debug_config.h"
}

static MainWindow* s_mainWindow = nullptr;

static void onMsgReceivedCallback(const char* ch_id, int ch_id_len, uint64_t author) {
    if (s_mainWindow)
        s_mainWindow->onMessageReceived(ch_id, ch_id_len, author);
}

static void onChannelUpdatedCallback(const char* ch_id, int ch_id_len) {
    Q_UNUSED(ch_id_len);
    Q_UNUSED(ch_id);
    if (s_mainWindow)
        s_mainWindow->reloadChannels();
}

static void onMembersChangedCallback(const char* ch_id, int ch_id_len) {
    Q_UNUSED(ch_id_len);
    if (s_mainWindow)
        s_mainWindow->onMembersChanged(ch_id);
}

static void onAutoConnectStatusCallback(uint8_t status, uint16_t total_tried,
                                         uint16_t node_count, uint16_t connected) {
    if (s_mainWindow)
        s_mainWindow->onAutoConnectStatus(status, total_tried, node_count, connected);
}

static void onChannelPeersOnlineCallback(const char* ch_id, int ch_id_len, uint16_t online) {
    if (s_mainWindow)
        s_mainWindow->onChannelPeersOnline(ch_id, ch_id_len, online);
}

MainWindow::MainWindow(QWidget *parent, DbManager* db, const QString& cfgPath,
                       const QString& dbPath, const QString& debugFile,
                       const QString& debugLevel, const QString& debugCategories)
    : QMainWindow(parent)
    , m_channelList(nullptr), m_messageList(nullptr), m_accountList(nullptr)
    , m_trayIcon(nullptr), m_trayMenu(nullptr)
    , m_db(db), m_cfgPath(cfgPath), m_cfgDbPath(dbPath)
    , m_cfgDebugFile(debugFile), m_cfgDebugLevel(debugLevel)
    , m_cfgDebugCategories(debugCategories)
    , m_recorder(nullptr)
{
    setWindowTitle("Chat");
    resize(900, 600);
    if (m_db) m_db->setDbPath(m_cfgDbPath);
    setupUi();
    setupTray();
    setupSoundFromConfig();
    if (m_db) {
        setupBridgeCallbacks();
        setupMessaging();
        setupNode();
        setupConnects();
    }
}

MainWindow::~MainWindow() {
    if (m_recorder) { m_recorder->shutdown(); m_recorder = nullptr; }
    SoundManager::instance()->shutdown();
    DEBUG_DEBUG(DEBUG_CATEGORY_DEBUG, "MainWindow: ~MainWindow — saving channel state");
    if (m_messageList) m_messageList->saveChannelState();
    DEBUG_DEBUG(DEBUG_CATEGORY_DEBUG, "MainWindow: ~MainWindow — stopping utun node");
    if (m_node) { m_node->stop(); delete m_node; m_node = nullptr; }
    DEBUG_DEBUG(DEBUG_CATEGORY_DEBUG, "MainWindow: ~MainWindow — node stop+delete done");
    AnimTimer::shutdown();
    MessageList::cleanupAnimations();
    DEBUG_DEBUG(DEBUG_CATEGORY_DEBUG, "MainWindow: ~MainWindow — animations cleaned");
    DEBUG_DEBUG(DEBUG_CATEGORY_DEBUG, "MainWindow: ~MainWindow done");
}

void MainWindow::setupUi() {
    auto *splitter = new QSplitter(Qt::Horizontal, this);

    m_channelList = new ChannelList(m_db, splitter);
    m_recorder = new AudioRecorder(this);
    m_messageList = new MessageList(m_db, m_recorder, splitter);
    m_accountList = new AccountList(m_db, splitter);

    splitter->addWidget(m_channelList);
    splitter->addWidget(m_messageList);
    splitter->addWidget(m_accountList);

    splitter->setStretchFactor(0, 2);
    splitter->setStretchFactor(1, 5);
    splitter->setStretchFactor(2, 1);

    splitter->setSizes({220, 480, 180});

    setCentralWidget(splitter);
}

void MainWindow::setupNode() {
    m_node = new UtunNode(this);
    connect(m_node, &UtunNode::error, this, [](const QString& msg) {
        qWarning("UtunNode error: %s", qPrintable(msg));
    });
    connect(m_node, &UtunNode::started, this, []() {
        qDebug("UtunNode started");
    });
    connect(m_node, &UtunNode::stopped, this, [this]() {
        qDebug("UtunNode stopped");
        if (m_node) m_node->finalize();
        qApp->quit();
    });

    if (!m_cfgDebugFile.isEmpty())
        m_node->setDebugFile(m_cfgDebugFile);
    if (!m_cfgDebugLevel.isEmpty())
        m_node->setDebugLevel(m_cfgDebugLevel);
        if (!m_cfgDebugCategories.isEmpty())
            m_node->setDebugCategories(m_cfgDebugCategories);

    if (!m_cfgDbPath.isEmpty())
        m_node->setDbPath(m_cfgDbPath);

    if (!m_node->start(m_cfgPath))
        qWarning("Failed to start UtunNode");
    else
        AnimTimer::instance()->logRegisteredIcons();
}

void MainWindow::setupMessaging() {
    gui_bridge_init();
}

void MainWindow::setupSoundFromConfig() {
    SoundManager* sm = SoundManager::instance();
    if (!sm->init()) return;

    QString soundDir, msgInFile, msgOutFile, connectFile, disconnectFile;
    QFile cfgFile(m_cfgPath);
    if (cfgFile.open(QIODevice::ReadOnly | QIODevice::Text)) {
        bool inGui = false;
        QTextStream in(&cfgFile);
        while (!in.atEnd()) {
            QString line = in.readLine().trimmed();
            if (line == "[gui]") { inGui = true; continue; }
            if (line.startsWith("[") && line.endsWith("]")) inGui = false;
            if (!inGui) continue;
            if (line.startsWith("sound_dir="))           soundDir = line.mid(10).trimmed();
            else if (line.startsWith("sound_msg_incoming=")) msgInFile = line.mid(19).trimmed();
            else if (line.startsWith("sound_msg_outgoing=")) msgOutFile = line.mid(19).trimmed();
            else if (line.startsWith("sound_connect="))      connectFile = line.mid(14).trimmed();
            else if (line.startsWith("sound_disconnect="))   disconnectFile = line.mid(17).trimmed();
        }
        cfgFile.close();
    }

    if (soundDir.isEmpty()) soundDir = "sounds";
    QDir binDir(QApplication::applicationDirPath());
    QString baseDir = QDir::isAbsolutePath(soundDir) ? soundDir : binDir.absoluteFilePath(soundDir);
    auto resolvePath = [&baseDir](const QString& f) { return f.isEmpty() ? QString() : QDir::cleanPath(baseDir + "/" + f); };

    struct { const char* name; QString file; } events[] = {
        {"msg_incoming", msgInFile}, {"msg_outgoing", msgOutFile},
        {"connect", connectFile},    {"disconnect", disconnectFile},
    };
    for (auto& e : events) { if (!e.file.isEmpty()) sm->loadSound(e.name, resolvePath(e.file)); }

    if (m_db && m_db->isOpen()) {
        sm->setEnabled(m_db->getUiStateInt("sound_enabled", 1));
        sm->setVolume(m_db->getUiStateInt("sound_volume", 80) / 100.0f);
        QString se[] = {"msg_incoming", "msg_outgoing", "connect", "disconnect"};
        for (int i = 0; i < 4; i++) {
            const QString& ek = se[i];
            sm->setEvent(ek, m_db->getUiStateInt(QStringLiteral("sound_%1_on").arg(ek), i == 0 ? 1 : 0),
                         m_db->getUiStateInt(QStringLiteral("sound_%1_vol").arg(ek), 80) / 100.0f);
        }
    }

    if (m_recorder) {
        m_recorder->init();
        if (m_db && m_db->isOpen()) {
            m_recorder->setCaptureDeviceIndex(m_db->getUiStateInt("audio_input_device", -1));
            VoiceEncoder::setPreset(m_db->getUiStateInt("opus_codec_preset", 1));

            int compEnabled = m_db->getUiStateInt("compressor_enabled", 0);
            m_recorder->setCompressorEnabled(compEnabled != 0);
            if (m_recorder->compressor()) {
                AudioCompressor::Config compCfg;
                compCfg.maxGainDb = (float)m_db->getUiStateInt("compressor_max_gain_db", 30);
                compCfg.lookbackMs = m_db->getUiStateInt("compressor_lookback_ms", 200);
                compCfg.lookaheadMs = m_db->getUiStateInt("compressor_lookahead_ms", 100);
                compCfg.riseRatePer500ms = (float)m_db->getUiStateInt("compressor_rise_rate_tenths", 20) / 10.0f;
                compCfg.targetLevel = powf(10.0f, (float)m_db->getUiStateInt("compressor_target_level_db", -12) / 20.0f);
                m_recorder->compressor()->configure(compCfg);
            }
        }
        DEBUG_INFO(DEBUG_CATEGORY_DEBUG, "AudioRecorder initialized (captureDevice=%d, opusPreset=%d, compressor=%d)",
                   m_recorder->captureDeviceIndex(), VoiceEncoder::preset(),
                   m_recorder->isCompressorEnabled() ? 1 : 0);
    }
}

void MainWindow::setupBridgeCallbacks() {
    s_mainWindow = this;
    gui_bridge_set_msg_received_cb(onMsgReceivedCallback);
    gui_bridge_set_channel_updated_cb(onChannelUpdatedCallback);
    gui_bridge_set_members_changed_cb(onMembersChangedCallback);
    gui_bridge_set_my_node_id_cb([](uint64_t nid) {
        qDebug("MainWindow: MY_NODE_ID setMyNodeId(%016llx)", (unsigned long long)nid);
        if (s_mainWindow && s_mainWindow->m_db) s_mainWindow->m_db->setMyNodeId((quint64)nid);
    });
    gui_bridge_set_auto_connect_status_cb(onAutoConnectStatusCallback);
    gui_bridge_set_channel_peers_online_cb(onChannelPeersOnlineCallback);
    gui_bridge_set_db_ready_cb([]() {
        if (!s_mainWindow || !s_mainWindow->m_db) return;
        s_mainWindow->m_db->setDb(chat_core_get_db());
        s_mainWindow->m_channelList->loadChannels();
        QString lastCid = QSettings().value("last_channel_id").toString();
        if (!lastCid.isEmpty()) {
            s_mainWindow->m_channelList->selectChannel(lastCid);
            s_mainWindow->m_accountList->setChannel(lastCid);
        }
    });
}

void MainWindow::setupConnects() {
    connect(m_channelList, &ChannelList::channelSelected,
            this, [this](const QString& channelId) {
                QSettings().setValue("last_channel_id", channelId);
                m_currentChannelId = channelId;
                m_messageList->loadChannel(channelId);
                m_accountList->setChannel(channelId);
                QByteArray cidBA = channelId.toUtf8();
                char* cid = u_strdup(cidBA.constData());
                if (cid) gui_bridge_post_uasync_fn(chat_core_connect_channel_trampoline, cid);
            });
    connect(m_channelList, &ChannelList::inviteRequested,     this, &MainWindow::showInviteDialog);
    connect(m_channelList, &ChannelList::joinRequested,       this, &MainWindow::showJoinDialog);
    connect(m_channelList, &ChannelList::createGroupRequested, this, &MainWindow::onCreateGroupRequested);
    connect(m_channelList, &ChannelList::settingsRequested,   this, &MainWindow::showSettings);
    connect(m_accountList, &AccountList::memberRenamed,
            m_messageList, &MessageList::reloadLocalNicks);
    connect(m_messageList, &MessageList::readPositionChanged,
            this, [this](const QString& channelId, qint64 lastReadMsgId) {
                Q_UNUSED(lastReadMsgId);
                if (m_channelList && m_db)
                    m_channelList->setChannelUnreadCount(channelId,
                        m_db->getUnreadCount(channelId, lastReadMsgId));
            });
}

void MainWindow::setupTray() {
    m_trayIcon = new QSystemTrayIcon(this);
    m_trayIcon->setIcon(style()->standardIcon(QStyle::SP_ComputerIcon));
    m_trayIcon->setToolTip("Chat");

    m_trayMenu = new QMenu(this);
    QAction *settingsAction = m_trayMenu->addAction("Settings");
    connect(settingsAction, &QAction::triggered, this, &MainWindow::showSettings);

    m_trayMenu->addSeparator();

    QAction *showAction = m_trayMenu->addAction("Show");
    connect(showAction, &QAction::triggered, this, [this]() {
        show();
        raise();
        activateWindow();
    });

    QAction *quitAction = m_trayMenu->addAction("Quit");
    connect(quitAction, &QAction::triggered, this, [this]() {
        if (m_node) m_node->requestStop();
    });

    m_trayIcon->setContextMenu(m_trayMenu);

    connect(m_trayIcon, &QSystemTrayIcon::activated,
            this, &MainWindow::onTrayActivated);

    m_trayIcon->show();
}

void MainWindow::closeEvent(QCloseEvent *event) {
    DEBUG_DEBUG(DEBUG_CATEGORY_DEBUG, "MainWindow: closeEvent — hiding to tray");
    hide();
    m_trayIcon->showMessage("Chat", "Application minimized to tray.",
                             QSystemTrayIcon::Information, 2000);
    event->ignore();
}

void MainWindow::onTrayActivated(QSystemTrayIcon::ActivationReason reason) {
    if (reason == QSystemTrayIcon::Trigger ||
        reason == QSystemTrayIcon::DoubleClick) {
        show();
        raise();
        activateWindow();
    }
}

void MainWindow::showInviteDialog(const QString& channelId) {
    if (!m_db || !m_db->isOpen()) return;

    QByteArray pubkey;
    if (m_node && m_node->isRunning())
        pubkey = QByteArray::fromHex(m_node->pubKeyHex().toLatin1());

    if (pubkey.size() != 32) {
        QMessageBox::warning(this, "Error", "Failed to get node public key.");
        return;
    }

    QList<NodeAddr> addrs = m_node->getInviteAddresses(m_db);

    QString link = encodeInviteLink(channelId.toULongLong(), pubkey, addrs);
    if (link.isEmpty()) {
        QMessageBox::warning(this, "Error", "Failed to create invite link.");
        return;
    }

    InviteDialog dlg(link, this);
    dlg.exec();
}

void MainWindow::showJoinDialog() {
    if (!m_node || !m_node->isRunning()) {
        QMessageBox::warning(this, "Error", "Node is not running.");
        return;
    }

    QString autoLink;
    QClipboard* cb = QApplication::clipboard();
    QString clipText = cb->text(QClipboard::Clipboard).trimmed();
    if (clipText.startsWith("utun://") && decodeInviteLink(clipText).error.isEmpty())
        autoLink = clipText;
    else if (cb->supportsSelection()) {
        QString selText = cb->text(QClipboard::Selection).trimmed();
        if (selText.startsWith("utun://") && decodeInviteLink(selText).error.isEmpty())
            autoLink = selText;
    }

    JoinDialog dlg(m_node, m_db, this, autoLink);
    dlg.exec();
}

void MainWindow::showSettings() {
    SettingsDialog dlg(m_cfgPath, m_db, m_node, m_recorder, this);
    dlg.exec();
    reloadChannels();
}

void MainWindow::onMessageReceived(const char* ch_id, int ch_id_len, uint64_t author) {
    QString cid = QString::fromUtf8(ch_id, ch_id_len);
    DEBUG_INFO(DEBUG_CATEGORY_DEBUG, "MainWindow::onMessageReceived ch=%s author=%llu cur=%s",
               qPrintable(cid), (unsigned long long)author, qPrintable(m_currentChannelId));
    if (m_db && author != m_db->myNodeId())
        SoundManager::instance()->play("msg_incoming");
    if (m_messageList) {
        if (cid == m_currentChannelId) {
            m_messageList->refresh();
        } else if (m_channelList) {
            int unread = m_channelList->getChannelUnreadCount(cid) + 1;
            DEBUG_DEBUG(DEBUG_CATEGORY_DEBUG, "MainWindow::onMessageReceived increment unread ch=%s %d->%d",
                       qPrintable(cid), unread - 1, unread);
            m_channelList->setChannelUnreadCount(cid, unread);
        }
    }
    if (m_db && m_db->getUiStateInt("channel_sort", 0) == 1)
        reloadChannels();
}

void MainWindow::onMembersChanged(const char* ch_id) {
    QString cur = QSettings().value("last_channel_id").toString();
    if (cur == QString::fromUtf8(ch_id))
        m_accountList->refresh();
}

void MainWindow::onAutoConnectStatus(uint8_t status, uint16_t /*total_tried*/,
                                      uint16_t /*node_count*/, uint16_t /*connected*/) {
    if (m_channelList) {
        m_channelList->setAutoConnectActive(status == 0);
    }
}

void MainWindow::onChannelPeersOnline(const char* ch_id, int ch_id_len, uint16_t online) {
    if (m_channelList) {
        QString cid = QString::fromUtf8(ch_id, ch_id_len);
        DEBUG_INFO(DEBUG_CATEGORY_DEBUG, "MainWindow::onChannelPeersOnline cid=%s online=%u",
                   qPrintable(cid), online);
        m_channelList->setChannelPeersOnline(cid, (int)online);
    }
}

void MainWindow::reloadChannels() {
    if (m_channelList) {
        m_channelList->loadChannels();
        if (!m_pendingChannelSelect.isEmpty()) {
            m_channelList->selectChannel(m_pendingChannelSelect);
            m_accountList->setChannel(m_pendingChannelSelect);
            m_messageList->loadChannel(m_pendingChannelSelect);
            QSettings().setValue("last_channel_id", m_pendingChannelSelect);
            m_currentChannelId = m_pendingChannelSelect;
            m_pendingChannelSelect.clear();
        }
    }
}

void MainWindow::onCreateGroupRequested() {
    if (!m_node || !m_node->isRunning()) {
        QMessageBox::warning(this, "Error", "Node is not running.");
        return;
    }
    if (!gui_bridge_is_uasync_ready()) {
        QMessageBox::warning(this, "Error", "uTun thread is not ready yet. Please wait and try again.");
        return;
    }

    CreateGroupDialog dlg(this);
    if (dlg.exec() != QDialog::Accepted) return;

    QString name = dlg.groupName();
    if (name.isEmpty()) return;

    char* name_copy = u_strdup(name.toUtf8().constData());
    if (name_copy) gui_bridge_post_uasync_fn(chat_core_create_channel_auto_trampoline, name_copy);

    DEBUG_INFO(DEBUG_CATEGORY_DEBUG, "MainWindow: create group request posted name=%s", qPrintable(name));
}