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local QtCore = require 'qtcore'
local QtWidgets = require 'qtwidgets'

local GLWidget = require 'glwidget'

local Class = QtCore.Class('Window', QtWidgets.QWidget) {}

function Class:__static_init()
    self:__addslot('dockUndock()', self.dockUndock, 'private')
end

function Class:__init(mw)
    self.mainWindow = mw

    self.glWidget = GLWidget.new()

    self.xSlider = self:createSlider()
    self.ySlider = self:createSlider()
    self.zSlider = self:createSlider()

    self.connect(self.xSlider, SIGNAL 'valueChanged(int)', self.glWidget, SLOT 'setXRotation(int)')
    self.connect(self.glWidget, SIGNAL 'xRotationChanged(int)', self.xSlider, SLOT 'setValue(int)')
    self.connect(self.ySlider, SIGNAL 'valueChanged(int)', self.glWidget, SLOT 'setYRotation(int)')
    self.connect(self.glWidget, SIGNAL 'yRotationChanged(int)', self.ySlider, SLOT 'setValue(int)')
    self.connect(self.zSlider, SIGNAL 'valueChanged(int)', self.glWidget, SLOT 'setZRotation(int)')
    self.connect(self.glWidget, SIGNAL 'zRotationChanged(int)', self.zSlider, SLOT 'setValue(int)')

    local mainLayout = QtWidgets.QVBoxLayout.new()
    local container = QtWidgets.QHBoxLayout.new()
    container:addWidget(self.glWidget)
    container:addWidget(self.xSlider)
    container:addWidget(self.ySlider)
    container:addWidget(self.zSlider)

    local w = QtWidgets.QWidget.new()
    w:setLayout(container)
    mainLayout:addWidget(w)
    self.dockBtn = QtWidgets.QPushButton.new(tr 'Unlock', self)
    self.connect(self.dockBtn, SIGNAL 'clicked()', self, SLOT 'dockUndock()')
    mainLayout:addWidget(self.dockBtn)

    self:setLayout(mainLayout)

    self.xSlider:setValue(15 * 16)
    self.ySlider:setValue(345 * 16)
    self.zSlider:setValue(0 * 16)

    self:setWindowTitle(tr 'Hello GL')

    -- set focus policy to grab key event
    self:setFocusPolicy(QtCore.StrongFocus)
end

function Class:keyPressEvent(event)
    if event:key() == QtCore.Key_Escape then
        self:setParent(nil)
        self:setAttribute(QtCore.WA_DeleteOnClose)
        self:close()
    else
        QtWidgets.QWidget.keyPressEvent(self, event)
    end
end

function Class:dockUndock()
    if self:parent() ~= nil then
        self:setParent(nil)
        self:setAttribute(QtCore.WA_DeleteOnClose)
        self:move(math.floor(QtWidgets.QApplication.desktop():width() / 2 - self:width() / 2)
            , math.floor(QtWidgets.QApplication.desktop():height() / 2 - self:height() / 2)
        )
        self.dockBtn:setText(tr 'Dock')
        self:show()
    elseif not self.mainWindow:centralWidget() then
        if self.mainWindow:isVisible() then
            self:setAttribute(QtCore.WA_DeleteOnClose, false)
            self.dockBtn:setText(tr 'Undock')
            self.mainWindow:setCentralWidget(self)
        else
            QtWidgets.QMessageBox.information(self
                , tr 'Cannot dock'
                , tr 'Main window already closed'
            )
        end
    else
        QtWidgets.QMessageBox.information(self
            , tr 'Cannot dock'
            , tr 'Main window already occupied'
        )
    end
end

function Class:createSlider()
    local slider = QtWidgets.QSlider.new(QtCore.Vertical)
    slider:setRange(0, 360 * 16)
    slider:setSingleStep(16)
    slider:setPageStep(15 * 16)
    slider:setTickInterval(15 * 16)
    slider:setTickPosition(QtWidgets.QSlider.TicksRight)
    return slider
end

return Class
