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

#include "MainWindow.h"
#include "authdialog.h"
#include "authmanager.h"
#include "createstreamdialog.h"
#include "memberpickerdialog.h"
#include "networkmanager.h"
#include "settingsdialog.h"
#include "textinputdialog.h"
#include "ui_mainwindow.h"
#include <QApplication>
#include <QJsonDocument>
#include <QHeaderView>
#include <QItemSelectionModel>
#include <QLabel>
#include <QMenu>
#include <QKeyEvent>
#include <QMouseEvent>
#include <QJsonObject>
#include <QToolButton>
#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_store(nullptr), m_networkStreamModel(nullptr), m_particleListModel(nullptr),
      m_selectedParticleRow(-1), m_isDragging(false), m_textInputDialog(nullptr), m_createStreamDialog(nullptr)
{
  m_authDialog = new AuthDialog(this);
  m_textInputDialog = new TextInputDialog(this);
  connect(m_textInputDialog, &TextInputDialog::textSubmitted, this, &MainWindow::onTextMessageSubmitted);

  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 for periodic server connectivity check
  m_pingTimer = new QTimer(this);
  connect(m_pingTimer, &QTimer::timeout, this, []() {
    NetworkManager::instance().ping();
  });
  connect(&NetworkManager::instance(), &NetworkManager::pingResult, this, [this](int ms) {
    m_pingLabel->setText("connected " + QString::number(ms) + "ms");
    m_pingLabel->setStyleSheet("QLabel { color: #00AA00; }");
  });
  connect(&NetworkManager::instance(), &NetworkManager::pingFailed, this, [this]() {
    m_pingLabel->setText("disconnected");
    m_pingLabel->setStyleSheet("QLabel { color: #AA0000; }");
  });
  m_pingTimer->start(10000);
  NetworkManager::instance().ping();

  ui->splitter->setStretchFactor(0, 1);
  ui->splitter->setStretchFactor(1, 4);
  ui->splitter->setStretchFactor(2, 1);

  setupModels();

  m_authDialog->setModal(true);

  connect(m_authManager, &AuthManager::codeSentToEmail, m_authDialog, &AuthDialog::onCodeSentToEmail);
  connect(m_authManager, &AuthManager::errorOccurred, m_authDialog, &AuthDialog::showError);
  connect(m_authManager, &AuthManager::signedIn, m_authDialog, &AuthDialog::hide);
  connect(m_authDialog, &AuthDialog::codeRequested, m_authManager, &AuthManager::requestSignInCode);
  connect(m_authDialog, &AuthDialog::signInRequested, m_authManager, &AuthManager::signIn);
  connect(m_authManager, &AuthManager::signedIn, m_authDialog, &AuthDialog::reset);
  connect(m_authManager, &AuthManager::signedOut, m_authDialog, &AuthDialog::reset);
  connect(m_authManager, &AuthManager::signedOut, m_authDialog, &AuthDialog::show);
  connect(m_authManager, &AuthManager::signedIn, this, [this]() {
    m_store->setCurrentUserEmail(m_authManager->sessionData()->email);
    m_store->loadStartupData();
  });
  connect(m_store, &Store::startupDataLoaded, this, [this]() {
    ui->topLevelParticlesView->expandAll();
  });
  connect(m_store, &Store::particleUpdated, this, [this](const QString &, const QString &particleId) {
    if (particleId == m_selectedParticleId)
    {
      const Particle *particle = m_store->particleById(particleId);
      if (particle && !particle->ackedByEmails.empty())
      {
        QStringList acked;
        for (const auto &email : particle->ackedByEmails)
          acked.append(email);
        ui->label_3->setText("Acked by: " + acked.join(", "));
      }
      else
      {
        ui->label_3->setText("");
      }
    }
  });

  // DocumentSend toolbar button opens text input dialog
  connect(ui->toolButton_3, &QToolButton::clicked, this, &MainWindow::showTextInputDialog);

  // "New stream" button
  m_createStreamDialog = new CreateStreamDialog(this);
  connect(ui->pushButton, &QPushButton::clicked, this, [this]() {
    if (m_selectedNetworkName.isEmpty())
      return;
    const Network *network = m_store->networkById(m_selectedNetworkName);
    if (network)
      m_createStreamDialog->setNetworkMembers(network->members);
    m_createStreamDialog->show();
    m_createStreamDialog->raise();
    m_createStreamDialog->activateWindow();
  });
  connect(m_createStreamDialog, &CreateStreamDialog::streamRequested, this,
          [this](const QString &name, const QString &visibility, const QStringList &members) {
            m_store->createStream(m_selectedNetworkName, name, "", visibility, members);
          });

  // "Add members" toolbar button (ListAdd icon in right sidebar)
  connect(ui->toolButton_7, &QToolButton::clicked, this, [this]() {
    if (m_selectedStreamId.isEmpty() || m_selectedNetworkName.isEmpty())
      return;
    const Network *network = m_store->networkById(m_selectedNetworkName);
    const Stream *stream = m_store->streamById(m_selectedStreamId);
    if (!network || !stream)
      return;

    MemberPickerDialog picker("Add Members", this);
    picker.setMembers(network->members, stream->memberEmails);

    if (picker.exec() == QDialog::Accepted)
    {
      QStringList emails = picker.selectedEmails();
      if (!emails.isEmpty())
      {
        auto *op = m_store->addStreamMembers(m_selectedStreamId, emails);
        connect(op, &Operation::success, this, [this](const QJsonDocument &) {
          auto *fetchOp = m_store->fetchStream(m_selectedStreamId);
          connect(fetchOp, &Operation::success, this, [this](const QJsonDocument &) {
            ui->membersList->clear();
            const Stream *s = m_store->streamById(m_selectedStreamId);
            if (s)
            {
              for (const QString &email : s->memberEmails)
                ui->membersList->addItem(email.split("@")[0]);
            }
          });
        });
      }
    }
  });

  m_authManager->tryRestoreSession();

  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 store (data loaded after sign-in via loadStartupData)
  m_store = new Store(this);

  // Create and set tree model
  m_networkStreamModel = new NetworkStreamModel(m_store, 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_store, 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);

  // Install event filter to capture key presses from child views
  ui->topLevelParticlesView->installEventFilter(this);
  ui->particlesView->installEventFilter(this);
}

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

  if (selected.indexes().isEmpty())
  {
    m_particleListModel->setStreamId(QString());
    ui->membersList->clear();
    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;

    // Show stream members
    ui->membersList->clear();
    const Stream *stream = m_store->streamById(streamId);
    if (stream)
    {
      for (const QString &email : stream->memberEmails)
      {
        ui->membersList->addItem(email.split("@")[0]);
      }
    }

    // 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;
    ui->membersList->clear();

    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("");
    ui->label_3->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_2->setText(particle->createdByEmail);
    m_selectedParticleId = particle->id;

    if (particle->type == "text")
    {
      ui->label->setText(particle->data.value("content").toString());
    }
    else
    {
      ui->label->setText("");
    }

    // Show ack info
    if (!particle->ackedByEmails.empty())
    {
      QStringList acked;
      for (const auto &email : particle->ackedByEmails)
        acked.append(email);
      ui->label_3->setText("Acked by: " + acked.join(", "));
    }
    else
    {
      ui->label_3->setText("");
    }

    // Mark seen on selection
    if (!particle->seen)
    {
      m_store->markParticleSeen(particle->id);
    }
  }

  updateStatusBar();
}

void MainWindow::updateStatusBar()
{
  QStringList pathComponents;

  // Add network if selected
  if (!m_selectedNetworkName.isEmpty())
  {
    const Network *network = m_store->networkById(m_selectedNetworkName);
    if (network)
    {
      pathComponents << network->name;
    }
  }

  // Add stream if selected
  if (!m_selectedStreamId.isEmpty())
  {
    const Stream *stream = m_store->streamById(m_selectedStreamId);
    if (stream)
    {
      pathComponents << stream->name;
    }
  }

  // Add particle if selected
  if (!m_selectedParticleId.isEmpty())
  {
    const Particle *particle = m_store->particleById(m_selectedParticleId);
    if (particle)
    {
      pathComponents << "p_" + particle->id.right(5);
    }
  }

  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 data size indicator for selected particle
    if (!m_selectedParticleId.isEmpty())
    {
      const Particle *particle = m_store->particleById(m_selectedParticleId);
      if (particle)
      {
        QJsonObject dataObj;
        for (auto it = particle->data.constBegin(); it != particle->data.constEnd(); ++it)
          dataObj.insert(it.key(), QJsonValue::fromVariant(it.value()));
        int bytes = QJsonDocument(dataObj).toJson(QJsonDocument::Compact).size();
        if (bytes < 1024)
          m_storageLabel->setText(QString::number(bytes) + " B");
        else
          m_storageLabel->setText(QString::number(bytes / 1024) + " kB");
      }
      else
      {
        m_storageLabel->setText("");
      }
    }
    else
    {
      m_storageLabel->setText("");
    }
  }
  else
  {
    m_positionLabel->setText("");
    m_storageLabel->setText("");
  }
}


void MainWindow::showTextInputDialog()
{
  if (m_selectedStreamId.isEmpty())
    return;

  m_textInputDialog->show();
  m_textInputDialog->raise();
  m_textInputDialog->activateWindow();
}

bool MainWindow::eventFilter(QObject *obj, QEvent *event)
{
  if (event->type() == QEvent::KeyPress)
  {
    auto *keyEvent = static_cast<QKeyEvent *>(event);
    if (keyEvent->key() == Qt::Key_T && keyEvent->modifiers() == Qt::NoModifier && !m_selectedStreamId.isEmpty())
    {
      showTextInputDialog();
      return true;
    }
    if (keyEvent->key() == Qt::Key_A && keyEvent->modifiers() == Qt::NoModifier && !m_selectedParticleId.isEmpty())
    {
      m_store->ackParticle(m_selectedParticleId);
      return true;
    }
  }
  return QMainWindow::eventFilter(obj, event);
}

void MainWindow::onTextMessageSubmitted(const QString &text)
{
  if (m_selectedStreamId.isEmpty())
    return;

  auto *op = m_store->createParticle(m_selectedStreamId, "text", {{"content", text}});
  connect(op, &Operation::success, this, [this](const QJsonDocument &) {
    int lastRow = m_particleListModel->rowCount() - 1;
    if (lastRow >= 0)
    {
      ui->particlesView->setCurrentIndex(m_particleListModel->index(lastRow, 0));
      ui->particlesView->setFocus();
    }
  });
}

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);
}