--@include utils.txt
--@include render_devices/render_device.txt
--@include elements/root.txt
--@include skins/default.txt

require("utils.txt")
require("render_devices/render_device.txt")
require("elements/root.txt")
local defaultSkin = require("skins/default.txt")

GUI = class("GUI")

function GUI:initialize(renderDevice, skin)
    checkVarClass(renderDevice, RenderDevice)
    
    self.renderDevice = renderDevice
    self._root = ERoot:new("root")
    self._root:setSize(renderDevice:getSize())
    self._root:_setSkin(skin or defaultSkin)
        
    hook.add("inputPressed", "gui_inputPressed", function(key)
        local keyName = input.getKeyName(key)
        
        if key >= 107 and key <= 111 then
            local x, y = input.getCursorPos()
            
            self._root:_postEvent("MOUSE_PRESSED", x, y, key, keyName)
        else
            self._root:_postEvent("BUTTON_PRESSED", x, y, key, keyName)
        end
    end)
    
    hook.add("inputReleased", "gui_inputReleased", function(key)
        local keyName = input.getKeyName(key)
        
        if key >= 107 and key <= 111 then
            local x, y = input.getCursorPos()
            
            self._root:_postEvent("MOUSE_RELEASED", x, y, key, keyName)
        else
            self._root:_postEvent("BUTTON_RELEASED", x, y, key, keyName)
        end
    end)
    
    self._lastMouseX = 0
    self._lastMouseY = 0
    hook.add("think", "gui_think", function()
        if input.getCursorVisible then
            local x, y = input.getCursorPos()
            
            if x ~= self._lastMouseX or y ~= self._lastMouseY then
                self._lastMouseX = x
                self._lastMouseY = y
                
                self._root:_postEvent("MOUSE_MOVED", x, y)
            end
        end
        
        self._root:_postEvent("THINK") 
    end)
    
    renderDevice.render = function()
        self._root:_postEvent("PAINT")
    end
end

function GUI:getRoot()
    return self._root
end

function GUI:add(element)
    this._root:addChild(element)
end

function GUI:setVisible(state)
    self._root:setVisible(state)
end

function GUI:isVisible()
    self._root:isVisible()
end