//
// Created by arjun-flowylabs on 1/10/2026.
//

#include "MainWindow.h"
#include "authdialog.h"
#include "authmanager.h"
#include "settingsdialog.h"
#include "ui_mainwindow.h"
#include <QApplication>
#include <QHeaderView>
#include <QItemSelectionModel>
#include <QLabel>
#include <QMenu>
#include <QMouseEvent>
#include <QRandomGenerator>
#include <QSystemTrayIcon>
#include <QTimer>

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent), m_trayIcon(nullptr), m_authManager(new AuthManager(this)), m_settingsDialog(nullptr),
      m_authDialog(nullptr), m_data(nullptr), m_networkStreamModel(nullptr), m_particleListModel(nullptr),
      m_selectedParticleRow(-1), m_isDragging(false)
{
  m_authDialog = new AuthDialog(m_authManager, this);

  ui = new Ui::MainWindow;
  ui->setupUi(this);

  QWidget *topBar = ui->widget;
  topBar->setCursor(Qt::OpenHandCursor);

  // Enable frameless window for edge-to-edge experience
  setWindowFlags(Qt::FramelessWindowHint | Qt::Window);
  setAttribute(Qt::WA_TranslucentBackground, false);

  // Style for grey status bar text
  QString statusBarLabelStyle = "QLabel { color: #808080; }";
  QString pingLabelStyle = "QLabel { color: #00AA00; }"; // Green for ping

  m_currentPathLabel = new QLabel(this);
  m_currentPathLabel->setMargin(5);
  m_currentPathLabel->setStyleSheet(statusBarLabelStyle);
  QFont font = QFont();
  font.setStyle(QFont::StyleItalic);
  m_currentPathLabel->setFont(font);
  ui->statusbar->addWidget(m_currentPathLabel);

  // Add spacer to push right-aligned items to the right
  ui->statusbar->addPermanentWidget(new QLabel(""), 1);

  // Ping indicator (green text)
  m_pingLabel = new QLabel(this);
  m_pingLabel->setMargin(5);
  m_pingLabel->setMinimumWidth(100);
  m_pingLabel->setAlignment(Qt::AlignCenter);
  m_pingLabel->setStyleSheet(pingLabelStyle);
  ui->statusbar->addPermanentWidget(m_pingLabel);

  // Position indicator (vim-style)
  m_positionLabel = new QLabel(this);
  m_positionLabel->setMargin(5);
  m_positionLabel->setMinimumWidth(50);
  m_positionLabel->setAlignment(Qt::AlignCenter);
  m_positionLabel->setStyleSheet(statusBarLabelStyle);
  ui->statusbar->addPermanentWidget(m_positionLabel);

  // Storage indicator
  m_storageLabel = new QLabel(this);
  m_storageLabel->setMargin(5);
  m_storageLabel->setMinimumWidth(60);
  m_storageLabel->setAlignment(Qt::AlignCenter);
  m_storageLabel->setStyleSheet(statusBarLabelStyle);
  ui->statusbar->addPermanentWidget(m_storageLabel);

  // Setup ping timer to oscillate every 500ms
  m_pingTimer = new QTimer(this);
  connect(m_pingTimer, &QTimer::timeout, this, &MainWindow::updatePingIndicator);
  m_pingTimer->start(500);
  updatePingIndicator();

  ui->splitter->setStretchFactor(0, 1);
  ui->splitter->setStretchFactor(1, 3);
  ui->splitter->setStretchFactor(2, 1);

  setupModels();

  m_authDialog->setModal(true);

  QTimer::singleShot(3000, this, [this]() {
    if (!m_authManager->isSignedIn())
    {
      m_authDialog->reset();
      m_authDialog->show();
    }
  });

  // Connect signal so dialog hides if valid session found, shows and resets on sign out
  connect(m_authManager, &AuthManager::isSignedInChanged, this, [this]() {
    if (m_authManager->isSignedIn())
    {
      m_authDialog->hide();
    }
    else
    {
      m_authDialog->reset();
      m_authDialog->show();
    }
  });

  // Check for cached session (async)
  m_authManager->init();

  setupTrayIcon();
}

void MainWindow::setupTrayIcon()
{
  m_trayIcon = new QSystemTrayIcon(this);
  m_trayIcon->setIcon(QIcon(":/assets/logo.png"));
  m_trayIcon->setToolTip("llink");

  QMenu *trayMenu = new QMenu(this);
  trayMenu->addAction("Show", this, &MainWindow::show);
  trayMenu->addAction("Quit", qApp, &QApplication::quit);
  m_trayIcon->setContextMenu(trayMenu);

  connect(m_trayIcon, &QSystemTrayIcon::activated, this, [this](QSystemTrayIcon::ActivationReason reason) {
    if (reason == QSystemTrayIcon::Trigger)
    {
      isVisible() ? hide() : show();
    }
  });

  m_trayIcon->show();
}

MainWindow::~MainWindow()
{
  delete ui;
}

void MainWindow::on_exitButton_clicked()
{
  qApp->exit(0);
}

void MainWindow::on_settingsButton_clicked()
{
  if (!m_settingsDialog)
  {
    m_settingsDialog = new SettingsDialog(m_authManager, this);
  }
  m_settingsDialog->show();
}

void MainWindow::setupModels()
{
  // Create data with fake data
  m_data = new Data(this);

  // Create and set tree model
  m_networkStreamModel = new NetworkStreamModel(m_data, this);
  ui->topLevelParticlesView->setModel(m_networkStreamModel);
  ui->topLevelParticlesView->setIndentation(5);
  ui->topLevelParticlesView->setHeaderHidden(true);
  ui->topLevelParticlesView->expandAll();

  // Configure column behavior: name stretches, unseen count is fixed width
  ui->topLevelParticlesView->header()->setStretchLastSection(false);
  ui->topLevelParticlesView->header()->setSectionResizeMode(0, QHeaderView::Stretch);
  ui->topLevelParticlesView->header()->setSectionResizeMode(1, QHeaderView::Fixed);
  ui->topLevelParticlesView->setColumnWidth(1, 40);

  // Create and set list model
  m_particleListModel = new ParticleListModel(m_data, this);
  ui->particlesView->setModel(m_particleListModel);

  // Configure particle list view to use ellipses for long text
  ui->particlesView->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
  ui->particlesView->setTextElideMode(Qt::ElideRight);

  // Connect selection changes
  connect(ui->topLevelParticlesView->selectionModel(), &QItemSelectionModel::selectionChanged, this,
          &MainWindow::onTreeSelectionChanged);

  // Connect particle selection changes
  connect(ui->particlesView->selectionModel(), &QItemSelectionModel::selectionChanged, this,
          &MainWindow::onParticleSelectionChanged);

  // setup human presence list
  ui->presenceList->addItems(QStringList{"agnes", "katie", "stephen", "viet", "anthony"});
}

void MainWindow::onTreeSelectionChanged(const QItemSelection &selected, const QItemSelection &deselected)
{
  Q_UNUSED(deselected);

  if (selected.indexes().isEmpty())
  {
    m_particleListModel->setStreamId(QString());
    return;
  }

  QModelIndex index = selected.indexes().first();

  if (m_networkStreamModel->isStreamItem(index))
  {
    QString streamId = m_networkStreamModel->streamIdFromIndex(index);
    m_particleListModel->setStreamId(streamId);
    m_selectedStreamId = streamId;

    // Also track the parent network
    QModelIndex parentIndex = m_networkStreamModel->parent(index);
    QString networkId = m_networkStreamModel->networkIdFromIndex(parentIndex);
    m_selectedNetworkName = networkId;

    // Auto-select first unseen particle (or first particle if all seen)
    int unseenRow = m_particleListModel->firstUnseenRow();
    if (unseenRow >= 0)
    {
      ui->particlesView->setCurrentIndex(m_particleListModel->index(unseenRow, 0));
      ui->particlesView->setFocus();
    }
    else if (m_particleListModel->rowCount() > 0)
    {
      ui->particlesView->setCurrentIndex(m_particleListModel->index(m_particleListModel->rowCount() - 1, 0));
      ui->particlesView->setFocus();
    }
  }
  else // network selected
  {
    m_particleListModel->setStreamId(QString());
    m_selectedStreamId.clear();
    m_selectedParticleRow = -1;

    QString networkId = m_networkStreamModel->networkIdFromIndex(index);
    m_selectedNetworkName = networkId;
  }

  updateStatusBar();
}

void MainWindow::onParticleSelectionChanged(const QItemSelection &selected, const QItemSelection &deselected)
{
  Q_UNUSED(deselected);

  if (selected.indexes().isEmpty())
  {
    ui->label->setText("");
    ui->label_2->setText("");
    m_selectedParticleId.clear();
    m_selectedParticleRow = -1;
    updateStatusBar();
    return;
  }

  QModelIndex index = selected.indexes().first();
  m_selectedParticleRow = index.row();
  const Particle *particle = m_particleListModel->particleAtRow(index.row());
  if (particle)
  {
    // ui->label->setText(particle->summary);
    ui->label_2->setText(particle->createdBy);
    m_selectedParticleId = particle->id;
  }

  updateStatusBar();
}

void MainWindow::updateStatusBar()
{
  QStringList pathComponents;

  // Add network if selected
  if (!m_selectedNetworkName.isEmpty())
  {
    for (const auto &network : m_data->networks())
    {
      if (network.id == m_selectedNetworkName)
      {
        pathComponents << network.name;
        break;
      }
    }
  }

  // Add stream if selected
  if (!m_selectedStreamId.isEmpty() && !m_selectedNetworkName.isEmpty())
  {
    const QList<Stream> &streams = m_data->streamsForNetwork(m_selectedNetworkName);
    for (const auto &stream : streams)
    {
      if (stream.id == m_selectedStreamId)
      {
        pathComponents << stream.name;
        break;
      }
    }
  }

  // Add particle if selected
  if (!m_selectedParticleId.isEmpty() && !m_selectedStreamId.isEmpty())
  {
    const QList<Particle> &particles = m_data->particlesForStream(m_selectedStreamId);
    for (const auto &particle : particles)
    {
      if (particle.id == m_selectedParticleId)
      {
        pathComponents << particle.id;
        break;
      }
    }
  }

  m_currentPathLabel->setText(pathComponents.join(" > "));

  // Update position indicator (vim-style)
  if (!m_selectedStreamId.isEmpty())
  {
    int totalCount = m_particleListModel->rowCount();
    if (totalCount == 0)
    {
      m_positionLabel->setText("");
    }
    else if (totalCount == 1)
    {
      m_positionLabel->setText("All");
    }
    else if (m_selectedParticleRow == 0)
    {
      m_positionLabel->setText("Top");
    }
    else if (m_selectedParticleRow == totalCount - 1)
    {
      m_positionLabel->setText("Bot");
    }
    else if (m_selectedParticleRow >= 0)
    {
      int percent = (m_selectedParticleRow * 100) / (totalCount - 1);
      m_positionLabel->setText(QString::number(percent) + "%");
    }
    else
    {
      m_positionLabel->setText("");
    }

    // Update storage indicator with pseudo-random size based on stream ID
    uint hash = qHash(m_selectedStreamId);
    int sizeKB = 50 + (hash % 950); // Random size between 50-1000 kB
    m_storageLabel->setText(QString::number(sizeKB) + " kB");
  }
  else
  {
    m_positionLabel->setText("");
    m_storageLabel->setText("");
  }
}

void MainWindow::updatePingIndicator()
{
  // Oscillate ping between 15-35ms
  static int basePing = 23;
  int variation = (QRandomGenerator::global()->bounded(21)) - 10; // -10 to +10
  int currentPing = basePing + variation;
  if (currentPing < 15)
    currentPing = 15;
  if (currentPing > 35)
    currentPing = 35;

  m_pingLabel->setText("connected " + QString::number(currentPing) + "ms");
}

void MainWindow::mousePressEvent(QMouseEvent *event)
{
  if (event->button() == Qt::LeftButton)
  {
    // Check if the click is within the top bar widget area
    QWidget *topBar = ui->widget; // The top bar widget from the UI
    if (topBar && topBar->geometry().contains(event->pos()))
    {
      m_isDragging = true;
      setCursor(Qt::ClosedHandCursor);
      m_dragPosition = event->globalPosition().toPoint() - frameGeometry().topLeft();
      event->accept();
      return;
    }
  }
  QMainWindow::mousePressEvent(event);
}

void MainWindow::mouseMoveEvent(QMouseEvent *event)
{
  if (m_isDragging && (event->buttons() & Qt::LeftButton))
  {
    move(event->globalPosition().toPoint() - m_dragPosition);
    event->accept();
    return;
  }
  QMainWindow::mouseMoveEvent(event);
}

void MainWindow::mouseReleaseEvent(QMouseEvent *event)
{
  if (event->button() == Qt::LeftButton)
  {
    m_isDragging = false;
    unsetCursor();
  }
  QMainWindow::mouseReleaseEvent(event);
}