#include "mainwindow.h"
#include "channellist.h"
#include "messagelist.h"
#include "accountlist.h"
#include "invitedialog.h"
#include "invite_link.h"
#include "../db/db_manager.h"
#include "../transport/utun_node.h"
#include "../transport/node_config.h"
#include "../transport/chat_propagator.h"
#include <QSplitter>
#include <QCloseEvent>
#include <QApplication>
#include <QStyle>
#include <QMessageBox>
#include <QStandardPaths>
#include <QDir>

MainWindow::MainWindow(QWidget *parent, DbManager* db)
    : QMainWindow(parent)
    , m_channelList(nullptr)
    , m_messageList(nullptr)
    , m_accountList(nullptr)
    , m_trayIcon(nullptr)
    , m_trayMenu(nullptr)
    , m_db(db)
{
    setWindowTitle("Chat");
    resize(900, 600);
    setupUi();
    setupTray();

    if (m_db && m_db->isOpen()) {
        setupNode();
        setupMessaging();

        connect(m_channelList, &ChannelList::channelSelected,
                this, [this](const QString& channelId) {
                    m_db->setUiState("last_channel_id", channelId);
                    m_messageList->loadChannel(channelId);
                });

        connect(m_channelList, &ChannelList::inviteRequested,
                this, &MainWindow::showInviteDialog);

        m_channelList->loadChannels();
        m_accountList->loadAccounts();

        QString lastCid = m_db->getUiState("last_channel_id");
        if (!lastCid.isEmpty())
            m_channelList->selectChannel(lastCid);
    }
}

MainWindow::~MainWindow() {
    if (m_node) { m_node->stop(); delete m_node; m_node = nullptr; }
    delete m_config;
}

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

    m_channelList = new ChannelList(m_db, splitter);
    m_messageList = new MessageList(m_db, 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() {
    QString configDir = QStandardPaths::writableLocation(QStandardPaths::AppConfigLocation);
    QDir().mkpath(configDir);
    QString configPath = configDir + "/node.conf";

    m_config = new NodeConfig(configPath);
    if (!m_config->exists()) {
        if (!m_config->create("chatgui", 1333)) {
            qWarning("Failed to create node config");
            return;
        }
    } else {
        m_config->load();
    }

    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, []() {
        qDebug("UtunNode stopped");
    });

    if (!m_node->start(configPath))
        qWarning("Failed to start UtunNode");
}

void MainWindow::setupMessaging() {
    if (!m_node || !m_node->isRunning()) return;
    m_propagator = new ChatPropagator(m_node, m_db, this);
    m_messageList->setPropagator(m_propagator);

    connect(m_propagator, &ChatPropagator::messageReceived,
            m_messageList, &MessageList::addMessage);
}

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

    QAction *quitAction = m_trayMenu->addAction("Quit");
    connect(quitAction, &QAction::triggered, qApp, &QApplication::quit);

    m_trayIcon->setContextMenu(m_trayMenu);

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

    m_trayIcon->show();
}

void MainWindow::closeEvent(QCloseEvent *event) {
    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_config && !m_config->pubKey().isEmpty())
        pubkey = QByteArray::fromHex(m_config->pubKey().toLatin1());

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

    QList<NodeAddr> addrs = m_db->getOnlinePeerAddresses(m_db->myNodeId());

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

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