#include "MainWindow.h"

#include <QApplication>
#include <QHBoxLayout>
#include <QMessageBox>
#include <QPushButton>
#include <QResizeEvent>
#include <QVBoxLayout>

#include "BuildButtonGrid.h"
#include "GameWorldView.h"
#include "HeaderBar.h"
#include "SelectedBuildingPanel.h"
#include "Simulation.h"
#include "Tick.h"

MainWindow::MainWindow(Simulation* sim, const GameConfig* config,
                       const VisualsConfig* visuals, QWidget* parent)
    : QWidget(parent)
    , m_sim(sim)
{
    setWindowTitle("Dota Factory");
    resize(1280, 768);

    m_headerBar = new HeaderBar(this);

    m_gameWorldView = new GameWorldView(sim, config, visuals, this);

    m_bottomPanel = new QWidget(this);
    QHBoxLayout* bottomLayout = new QHBoxLayout(m_bottomPanel);
    bottomLayout->setContentsMargins(0, 0, 0, 0);
    bottomLayout->setSpacing(0);

    m_selectedBuildingPanel = new SelectedBuildingPanel(sim, config, m_bottomPanel);
    m_buildButtonGrid       = new BuildButtonGrid(config, m_bottomPanel);

    bottomLayout->addWidget(m_selectedBuildingPanel, 1);
    bottomLayout->addWidget(m_buildButtonGrid,       1);

    // Signals: game world → other panels
    connect(m_gameWorldView, SIGNAL(selectionChanged(std::vector<EntityId>)),
            m_selectedBuildingPanel, SLOT(onSelectionChanged(std::vector<EntityId>)));

    connect(m_gameWorldView, SIGNAL(stateUpdated(Tick, int, double)),
            m_headerBar, SLOT(onStateUpdated(Tick, int, double)));

    connect(m_gameWorldView, SIGNAL(stateUpdated(Tick, int, double)),
            this, SLOT(onStateUpdated(Tick, int, double)));  // for affordability

    connect(m_gameWorldView, SIGNAL(stateUpdated(Tick, int, double)),
            m_selectedBuildingPanel, SLOT(onStateUpdated(Tick, int, double)));

    connect(m_gameWorldView, SIGNAL(gameOver()),
            this, SLOT(onGameOver()));

    connect(m_gameWorldView, SIGNAL(escapeMenuRequested()),
            this, SLOT(onEscapeMenuRequested()));

    // Signals: build grid → game world
    connect(m_buildButtonGrid, SIGNAL(buildingTypeSelected(BuildingType)),
            m_gameWorldView, SLOT(enterBuilderMode(BuildingType)));

    connect(m_buildButtonGrid, SIGNAL(builderModeExited()),
            m_gameWorldView, SLOT(exitBuilderMode()));

    connect(m_gameWorldView, SIGNAL(builderModeExited()),
            m_buildButtonGrid, SLOT(clearActiveButton()));

    connect(m_buildButtonGrid, SIGNAL(demolishModeToggleRequested()),
            m_gameWorldView, SLOT(toggleDemolishMode()));

    connect(m_gameWorldView, SIGNAL(demolishModeChanged(bool)),
            m_buildButtonGrid, SLOT(setDemolishModeActive(bool)));

    // Signals: header bar → game world
    connect(m_headerBar, SIGNAL(speedChanged(double)),
            m_gameWorldView, SLOT(setGameSpeed(double)));

    m_gameWorldView->setFocus();

    connect(qApp, &QApplication::focusChanged, this, [this](QWidget*, QWidget* newWidget) {
        if (newWidget && newWidget != m_gameWorldView && !QApplication::activeModalWidget())
        {
            m_gameWorldView->setFocus();
        }
    });
}

void MainWindow::resizeEvent(QResizeEvent* event)
{
    QWidget::resizeEvent(event);
    layoutPanels();
}

void MainWindow::layoutPanels()
{
    const int totalW  = width();
    const int totalH  = height();
    const int headerH = m_headerBar->sizeHint().height();
    if (headerH <= 0) { return; }
    const int remaining = totalH - headerH;
    const int gameH     = remaining * 70 / 100;
    const int panelH    = remaining - gameH;

    m_headerBar->setGeometry(0, 0, totalW, headerH);
    m_gameWorldView->setGeometry(0, headerH, totalW, gameH);
    m_bottomPanel->setGeometry(0, headerH + gameH, totalW, panelH);
}

void MainWindow::onStateUpdated(Tick /*tick*/, int blocks, double /*speed*/)
{
    m_buildButtonGrid->updateAffordability(blocks);
}

void MainWindow::onEscapeMenuRequested()
{
    const double prevSpeed = m_gameWorldView->gameSpeed();
    m_gameWorldView->setGameSpeed(0.0);

    QMessageBox box(this);
    box.setWindowTitle("Paused");
    QPushButton* continueBtn = box.addButton("Continue", QMessageBox::AcceptRole);
    QPushButton* restartBtn  = box.addButton("Restart",  QMessageBox::ResetRole);
    QPushButton* quitBtn     = box.addButton("Quit",     QMessageBox::DestructiveRole);
    box.setEscapeButton(continueBtn);
    box.exec();

    QAbstractButton* clicked = box.clickedButton();
    if (clicked == restartBtn)
    {
        m_sim->reset();
        m_gameWorldView->resetForNewGame();
    }
    else if (clicked == quitBtn)
    {
        close();
    }
    else
    {
        m_gameWorldView->setGameSpeed(prevSpeed);
    }
}

void MainWindow::onGameOver()
{
    const Tick tick = m_sim->currentTick();
    const int totalSeconds = static_cast<int>(ticksToSeconds(tick));
    const int minutes = totalSeconds / 60;
    const int seconds = totalSeconds % 60;

    QMessageBox box(this);
    box.setWindowTitle("Game Over");
    box.setText(QString("HQ destroyed!\nSurvival time: %1:%2")
        .arg(minutes, 2, 10, QChar('0'))
        .arg(seconds, 2, 10, QChar('0')));
    QPushButton* restartBtn = box.addButton("Restart", QMessageBox::AcceptRole);
    box.addButton("Quit", QMessageBox::RejectRole);
    box.exec();

    if (box.clickedButton() == restartBtn)
    {
        m_sim->reset();
        m_gameWorldView->resetForNewGame();
    }
    else
    {
        close();
    }
}