----------------------------------------- Libraries -----------------------------------------

local libraries = {
	advancedLua = "advancedLua",
	buffer = "doubleBuffering",
	unicode = "unicode",
	event = "event",
}

for library in pairs(libraries) do if not _G[library] then _G[library] = require(libraries[library]) end end; libraries = nil

----------------------------------------- Core constants -----------------------------------------

local GUI = {}

GUI.alignment = {
	horizontal = enum(
		"left",
		"center",
		"right"
	),
	vertical = enum(
		"top",
		"center",
		"bottom"
	)
}

GUI.directions = enum(
	"horizontal",
	"vertical"
)

GUI.colors = {
	disabled = {
		background = 0x888888,
		text = 0xAAAAAA
	},
	contextMenu = {
		background = 0xFFFFFF,
		separator = 0xAAAAAA,
		default = {
			text = 0x2D2D2D
		},
		disabled = {
			text = 0xAAAAAA
		},
		pressed = {
			background = 0x3366CC,
			text = 0xFFFFFF
		},
		transparency = {
			background = 20,
			shadow = 50
		}
	}
}

GUI.contextMenuElementTypes = enum(
	"default",
	"separator"
)

GUI.objectTypes = enum(
	"empty",
	"panel",
	"label",
	"button",
	"framedButton",
	"image",
	"windowActionButtons",
	"windowActionButton",
	"tabBar",
	"tabBarTab",
	"menu",
	"menuElement",
	"window",
	"inputTextBox",
	"textBox",
	"horizontalSlider",
	"switch",
	"progressBar"
)

----------------------------------------- Primitive objects -----------------------------------------

-- Universal method to check if object was clicked by following coordinates
local function isObjectClicked(object, x, y)
	if x >= object.x and y >= object.y and x <= object.x + object.width - 1 and y <= object.y + object.height - 1 and not object.disabled and not object.invisible ~= false then return true end
	return false
end

-- Limit object's text field to its' size
local function objectTextLimit(object)
	local text, textLength = object.text, unicode.len(object.text)
	if textLength > object.width then text = unicode.sub(text, 1, object.width); textLength = object.width end
	return text, textLength
end

-- Base object to use in everything
function GUI.object(x, y, width, height)
	return {
		x = x,
		y = y,
		width = width,
		height = height,
		isClicked = isObjectClicked
	}
end

----------------------------------------- Object alignment -----------------------------------------

-- Set children alignment in parent object
function GUI.setAlignment(object, horizontalAlignment, verticalAlignment)
	object.alignment = {
		horizontal = horizontalAlignment,
		vertical = verticalAlignment
	}
	return object
end

-- Get subObject position inside of parent object
function GUI.getAlignmentCoordinates(object, subObject)	
	local x, y
	if object.alignment.horizontal == GUI.alignment.horizontal.left then
		x = object.x
	elseif object.alignment.horizontal == GUI.alignment.horizontal.center then
		x = math.floor(object.x + object.width / 2 - subObject.width / 2)
	elseif object.alignment.horizontal == GUI.alignment.horizontal.right then
		x = object.x + object.width - subObject.width
	else
		error("Unknown horizontal alignment: " .. tostring(object.alignment.horizontal))
	end

	if object.alignment.vertical == GUI.alignment.vertical.top then
		y = object.y
	elseif object.alignment.vertical == GUI.alignment.vertical.center then
		y = math.floor(object.y + object.height / 2 - subObject.height / 2)
	elseif object.alignment.vertical == GUI.alignment.vertical.bottom then
		y = object.y + object.height - subObject.height
	else
		error("Unknown vertical alignment: " .. tostring(object.alignment.vertical))
	end

	return x, y
end

----------------------------------------- Containers -----------------------------------------

-- Object calling by it's name using 'container["objectName"]' against of 'container.children[1, 2, 3, ...]'
function GUI.setContainerMetasearch(container)
	setmetatable(container, {
		__index = function(container, objectName)
			for objectIndex = 1, #container.children do
				if container.children[objectIndex].name == objectName then return container.children[objectIndex] end
			end
		end
	})
end

-- Go recursively through every container's object (including other containers) and return object that was clicked firstly by it's GUI-layer position
function GUI.getClickedObject(container, xEvent, yEvent)
	local clickedObject, clickedIndex
	for objectIndex = #container.children, 1, -1 do
		container.children[objectIndex].x, container.children[objectIndex].y = container.children[objectIndex].localPosition.x + container.x - 1, container.children[objectIndex].localPosition.y + container.y - 1
		if container.children[objectIndex].children and #container.children[objectIndex].children > 0 then
			clickedObject, clickedIndex = GUI.getClickedObject(container.children[objectIndex], xEvent, yEvent)
		    if clickedObject then break end
		elseif not container.children[objectIndex].disableClicking and container.children[objectIndex]:isClicked(xEvent, yEvent) then
			clickedObject, clickedIndex = container.children[objectIndex], objectIndex
			break
		end
	end

	return clickedObject, clickedIndex
end

-- Add any object as children to parent container with specified objectName
local function addObjectToContainer(container, objectType, objectName, object)
	object.name = objectName
	object.type = objectType
	object.parent = container
	object.localPosition = {x = object.x, y = object.y}
	table.insert(container.children, object)
	return object
end

-- Add empty GUI.object to container
local function addEmptyObjectToContainer(container, objectName, ...)
	return addObjectToContainer(container, GUI.objectTypes.empty, objectName, GUI.object(...))
end

-- Add button object to container
local function addButtonObjectToContainer(container, objectName, ...)
	return addObjectToContainer(container, GUI.objectTypes.button, objectName, GUI.button(...))
end

-- Add adaptive button object to container
local function addAdaptiveButtonObjectToContainer(container, objectName, ...)
	return addObjectToContainer(container, GUI.objectTypes.button, objectName, GUI.adaptiveButton(...))
end

-- Add framedButton object to container
local function addFramedButtonObjectToContainer(container, objectName, ...)
	return addObjectToContainer(container, GUI.objectTypes.button, objectName, GUI.framedButton(...))
end

-- Add adaptive framedButton object to container
local function addAdaptiveFramedButtonObjectToContainer(container, objectName, ...)
	return addObjectToContainer(container, GUI.objectTypes.button, objectName, GUI.adaptiveFramedButton(...))
end

-- Add label object to container
local function addLabelObjectToContainer(container, objectName, ...)
	return addObjectToContainer(container, GUI.objectTypes.label, objectName, GUI.label(...))
end

-- Add panel object to container
local function addPanelObjectToContainer(container, objectName, ...)
	return addObjectToContainer(container, GUI.objectTypes.panel, objectName, GUI.panel(...))
end

-- Add windowActionButtons object to container
local function addWindowActionButtonsObjectToContainer(container, objectName, ...)
	return addObjectToContainer(container, GUI.objectTypes.windowActionButtons, objectName, GUI.windowActionButtons(...))
end

-- Add another container to container
local function addContainerToContainer(container, objectName, ...)
	return addObjectToContainer(container, GUI.objectTypes.container, objectName, GUI.container(...))
end

-- Add image object to container
local function addImageObjectToContainer(container, objectName, ...)
	return addObjectToContainer(container, GUI.objectTypes.image, objectName, GUI.image(...))
end

-- Add image object to container
local function addTabBarObjectToContainer(container, objectName, ...)
	return addObjectToContainer(container, GUI.objectTypes.tabBar, objectName, GUI.tabBar(...))
end

-- Add InputTextBox object to container
local function addInputTextBoxObjectToContainer(container, objectName, ...)
	return addObjectToContainer(container, GUI.objectTypes.inputTextBox, objectName, GUI.inputTextBox(...))
end

-- Add TextBox object to container
local function addTextBoxObjectToContainer(container, objectName, ...)
	return addObjectToContainer(container, GUI.objectTypes.textBox, objectName, GUI.textBox(...))
end

-- Add Horizontal Slider object to container
local function addHorizontalSliderObjectToContainer(container, objectName, ...)
	return addObjectToContainer(container, GUI.objectTypes.horizontalSlider, objectName, GUI.horizontalSlider(...))
end

-- Add Progressbar object to container
local function addProgressBarObjectToContainer(container, objectName, ...)
	return addObjectToContainer(container, GUI.objectTypes.progressBar, objectName, GUI.progressBar(...))
end

-- Add Switch object to container
local function addSwitchObjectToContainer(container, objectName, ...)
	return addObjectToContainer(container, GUI.objectTypes.switch, objectName, GUI.switch(...))
end

-- Recursively draw container's content including all children container's content
local function drawContainerContent(container)
	for objectIndex = 1, #container.children do
		container.children[objectIndex].x, container.children[objectIndex].y = container.children[objectIndex].localPosition.x + container.x - 1, container.children[objectIndex].localPosition.y + container.y - 1
		if container.children[objectIndex].children then
			-- drawContainerContent(container.children[objectIndex])
			container.children[objectIndex]:draw()
		else
			if container.children[objectIndex].draw then
				container.children[objectIndex]:draw()
			else
				error("Container object with index " .. objectIndex .. " and name \"" .. tostring(container.children[objectIndex].name) ..  "\" doesn't have :draw() method")
			end
		end
	end

	return container
end

-- Delete every container's children object
local function deleteContainersContent(container)
	for objectIndex = 1, #container.children do container.children[objectIndex] = nil end
end

-- Universal container to store any other objects like buttons, labels, etc
function GUI.container(x, y, width, height)
	local container = GUI.object(x, y, width, height)
	container.children = {}
	GUI.setContainerMetasearch(container)
	container.draw = drawContainerContent
	container.getClickedObject = GUI.getClickedObject
	container.deleteObjects = deleteContainersContent

	container.addObject = addEmptyObjectToContainer
	container.addContainer = addContainerToContainer
	container.addPanel = addPanelObjectToContainer
	container.addLabel = addLabelObjectToContainer
	container.addButton = addButtonObjectToContainer
	container.addAdaptiveButton = addAdaptiveButtonObjectToContainer
	container.addFramedButton = addFramedButtonObjectToContainer
	container.addAdaptiveFramedButton = addAdaptiveFramedButtonObjectToContainer
	container.addWindowActionButtons = addWindowActionButtonsObjectToContainer
	container.addImage = addImageObjectToContainer
	container.addTabBar = addTabBarObjectToContainer
	container.addTextBox = addTextBoxObjectToContainer
	container.addInputTextBox = addInputTextBoxObjectToContainer
	container.addHorizontalSlider = addHorizontalSliderObjectToContainer
	container.addSwitch = addSwitchObjectToContainer
	container.addProgressBar = addProgressBarObjectToContainer

	return container
end

----------------------------------------- Buttons -----------------------------------------

local function drawButton(object)
	local text, textLength = objectTextLimit(object)

	local xText, yText = GUI.getAlignmentCoordinates(object, {width = textLength, height = 1})
	local buttonColor = object.disabled and object.colors.disabled.background or (object.pressed and object.colors.pressed.background or object.colors.default.background)
	local textColor = object.disabled and object.colors.disabled.text or (object.pressed and object.colors.pressed.text or object.colors.default.text)

	if buttonColor then
		if object.buttonType == GUI.objectTypes.button then
			buffer.square(object.x, object.y, object.width, object.height, buttonColor, textColor, " ")
		else
			buffer.frame(object.x, object.y, object.width, object.height, buttonColor)
		end
	end

	buffer.text(xText, yText, textColor, text)

	return object
end

local function pressButton(object)
	object.pressed = true
	drawButton(object)
end

local function releaseButton(object)
	object.pressed = nil
	drawButton(object)
end

local function pressAndReleaseButton(object, pressTime)
	pressButton(object)
	buffer.draw()
	os.sleep(pressTime or 0.2)
	releaseButton(object)
	buffer.draw()
end

-- Создание таблицы кнопки со всеми необходимыми параметрами
local function createButtonObject(buttonType, x, y, width, height, buttonColor, textColor, buttonPressedColor, textPressedColor, text, disabledState)
	local object = GUI.object(x, y, width, height)
	object.colors = {
		default = {
			background = buttonColor,
			text = textColor
		},
		pressed = {
			background = buttonPressedColor,
			text = textPressedColor
		},
		disabled = {
			background = GUI.colors.disabled.background,
			text = GUI.colors.disabled.text,
		}
	}
	object.buttonType = buttonType
	object.disabled = disabledState
	object.text = text
	object.press = pressButton
	object.release = releaseButton
	object.pressAndRelease = pressAndReleaseButton
	object.draw = drawButton
	object.setAlignment = GUI.setAlignment
	object:setAlignment(GUI.alignment.horizontal.center, GUI.alignment.vertical.center)

	return object
end

-- Кнопка фиксированных размеров
function GUI.button(x, y, width, height, buttonColor, textColor, buttonPressedColor, textPressedColor, text, disabledState)
	return createButtonObject(GUI.objectTypes.button, x, y, width, height, buttonColor, textColor, buttonPressedColor, textPressedColor, text, disabledState)
end

-- Кнопка, подстраивающаяся под размер текста
function GUI.adaptiveButton(x, y, xOffset, yOffset, buttonColor, textColor, buttonPressedColor, textPressedColor, text, disabledState) 
	return createButtonObject(GUI.objectTypes.button, x, y, unicode.len(text) + xOffset * 2, yOffset * 2 + 1, buttonColor, textColor, buttonPressedColor, textPressedColor, text, disabledState)
end

-- Кнопка в рамке
function GUI.framedButton(x, y, width, height, buttonColor, textColor, buttonPressedColor, textPressedColor, text, disabledState)
	return createButtonObject(GUI.objectTypes.framedButton, x, y, width, height, buttonColor, textColor, buttonPressedColor, textPressedColor, text, disabledState)
end

function GUI.adaptiveFramedButton(x, y, xOffset, yOffset, buttonColor, textColor, buttonPressedColor, textPressedColor, text, disabledState)
	return createButtonObject(GUI.objectTypes.framedButton, x, y, unicode.len(text) + xOffset * 2, yOffset * 2 + 1, buttonColor, textColor, buttonPressedColor, textPressedColor, text, disabledState)
end

----------------------------------------- TabBar -----------------------------------------

local function drawTabBar(object)
	for tab = 1, #object.tabs.children do
		if tab == object.selectedTab then
			object.tabs.children[tab].pressed = true
		else
			object.tabs.children[tab].pressed = false
		end
	end

	object:reimplementedDraw()
	return object
end

function GUI.tabBar(x, y, width, height, spaceBetweenElements, backgroundColor, textColor, backgroundSelectedColor, textSelectedColor, ...)
	local elements, object = {...}, GUI.container(x, y, width, height)
	object.selectedTab = 1
	object.tabsWidth = 0; for elementIndex = 1, #elements do object.tabsWidth = object.tabsWidth + unicode.len(elements[elementIndex]) + 2 + spaceBetweenElements end; object.tabsWidth = object.tabsWidth - spaceBetweenElements
	object.reimplementedDraw = object.draw
	object.draw = drawTabBar

	object:addPanel("backgroundPanel", 1, 1, object.width, object.height, backgroundColor).disableClicking = true
	object.tabs = object:addContainer("tabs", 1, 1, object.width, object.height)

	x = math.floor(width / 2 - object.tabsWidth / 2)
	for elementIndex = 1, #elements do
		local tab = object.tabs:addButton(elements[elementIndex], x, 1, unicode.len(elements[elementIndex]) + 2, height, backgroundColor, textColor, backgroundSelectedColor, textSelectedColor, elements[elementIndex])
		tab.type = GUI.objectTypes.tabBarTab
		x = x + tab.width + spaceBetweenElements
	end	

	return object
end

----------------------------------------- Panel -----------------------------------------

local function drawPanel(object)
	buffer.square(object.x, object.y, object.width, object.height, object.colors.background, 0x000000, " ", object.colors.transparency)
	return object
end

function GUI.panel(x, y, width, height, color, transparency)
	local object = GUI.object(x, y, width, height)
	object.colors = {background = color, transparency = transparency}
	object.draw = drawPanel
	return object
end

----------------------------------------- Label -----------------------------------------

local function drawLabel(object)
	local text, textLength = objectTextLimit(object)
	local xText, yText = GUI.getAlignmentCoordinates(object, {width = textLength, height = 1})
	buffer.text(xText, yText, object.colors.text, text)
	return object
end

function GUI.label(x, y, width, height, textColor, text)
	local object = GUI.object(x, y, width, height)
	object.setAlignment = GUI.setAlignment
	object:setAlignment(GUI.alignment.horizontal.left, GUI.alignment.vertical.top)
	object.colors = {text = textColor}
	object.text = text
	object.draw = drawLabel
	return object
end

----------------------------------------- Image -----------------------------------------

local function drawImage(object)
	buffer.image(object.x, object.y, object.image)
	return object
end

function GUI.image(x, y, image)
	local object = GUI.object(x, y, image.width, image.height)
	object.image = image
	object.draw = drawImage
	return object
end

----------------------------------------- Window action buttons -----------------------------------------

local function drawWindowActionButton(object)
	local background = buffer.get(object.x, object.y)
	object.colors.default.background, object.colors.pressed.background, object.colors.disabled.background = background, background, background
	object:reimplementedDraw()
	return object
end

function GUI.windowActionButtons(x, y, fatSymbol)
	local symbol = fatSymbol and "⬤" or "●"
	
	local container = GUI.container(x, y, 5, 1)
	local closeButton = container:addButton("close", 1, 1, 1, 1, 0x000000, 0xFF4940, 0x000000, 0x992400, symbol)
	local minimizeButton = container:addButton("minimize", 3, 1, 1, 1, 0x000000, 0xFFB640, 0x000000, 0x996D00, symbol)
	local maximizeButton = container:addButton("maximize", 5, 1, 1, 1, 0x000000, 0x00B640, 0x000000, 0x006D40, symbol)

	closeButton.reimplementedDraw, minimizeButton.reimplementedDraw, maximizeButton.reimplementedDraw = closeButton.draw, minimizeButton.draw, maximizeButton.draw
	closeButton.draw, minimizeButton.draw, maximizeButton.draw = drawWindowActionButton, drawWindowActionButton, drawWindowActionButton

	return container
end

----------------------------------------- Context Menu -----------------------------------------

local function drawContextMenuElement(contextMenuObject, elementIndex, isPressed)
	if contextMenuObject.elements[elementIndex].type == GUI.contextMenuElementTypes.default then
		local textColor = contextMenuObject.elements[elementIndex].disabled and GUI.colors.contextMenu.disabled.text or (contextMenuObject.elements[elementIndex].color or GUI.colors.contextMenu.default.text)
		
		if isPressed then
			buffer.square(contextMenuObject.x, contextMenuObject.y + elementIndex - 1, contextMenuObject.width, 1, GUI.colors.contextMenu.pressed.background, GUI.colors.contextMenu.pressed.text, " ")
			textColor = GUI.colors.contextMenu.pressed.text
		end

		buffer.text(contextMenuObject.x + 2, contextMenuObject.y + elementIndex - 1, textColor, contextMenuObject.elements[elementIndex].text)
		
		if contextMenuObject.elements[elementIndex].shortcut then
			buffer.text(contextMenuObject.x + contextMenuObject.width - unicode.len(contextMenuObject.elements[elementIndex].shortcut) - 2, contextMenuObject.y + elementIndex - 1, textColor, contextMenuObject.elements[elementIndex].shortcut)
		end
	else
		buffer.text(contextMenuObject.x, contextMenuObject.y + elementIndex - 1, GUI.colors.contextMenu.separator, string.rep("─", contextMenuObject.width))
	end
end

local function drawContextMenu(contextMenuObject)
	buffer.square(contextMenuObject.x, contextMenuObject.y, contextMenuObject.width, contextMenuObject.height, GUI.colors.contextMenu.background, GUI.colors.contextMenu.default.text, " ", GUI.colors.contextMenu.transparency.background)
	GUI.windowShadow(contextMenuObject.x, contextMenuObject.y, contextMenuObject.width, contextMenuObject.height, GUI.colors.contextMenu.transparency.shadow, true)
	for elementIndex = 1, #contextMenuObject.elements do drawContextMenuElement(contextMenuObject, elementIndex, false) end
end

local function showContextMenu(contextMenuObject)
	local oldDrawLimit = buffer.getDrawLimit(); buffer.resetDrawLimit()
	-- Расчет ширины окна меню
	local longestElement, longestShortcut = 0, 0
	for elementIndex = 1, #contextMenuObject.elements do
		if contextMenuObject.elements[elementIndex].type == GUI.contextMenuElementTypes.default then
			longestElement = math.max(longestElement, unicode.len(contextMenuObject.elements[elementIndex].text))
			if contextMenuObject.elements[elementIndex].shortcut then longestShortcut = math.max(longestShortcut, unicode.len(contextMenuObject.elements[elementIndex].shortcut)) end
		end
	end
	contextMenuObject.width, contextMenuObject.height = longestElement + 4 + (longestShortcut > 0 and longestShortcut + 3 or 0), #contextMenuObject.elements

	-- А это чтоб за края экрана не лезло
	if contextMenuObject.y + contextMenuObject.height >= buffer.screen.height then contextMenuObject.y = buffer.screen.height - contextMenuObject.height end
	if contextMenuObject.x + contextMenuObject.width + 1 >= buffer.screen.width then contextMenuObject.x = buffer.screen.width - contextMenuObject.width - 1 end

	local oldPixels = buffer.copy(contextMenuObject.x, contextMenuObject.y, contextMenuObject.width + 1, contextMenuObject.height + 1)
	local function quit()
		buffer.paste(contextMenuObject.x, contextMenuObject.y, oldPixels)
		buffer.draw()
		buffer.setDrawLimit(oldDrawLimit)
	end

	drawContextMenu(contextMenuObject)
	buffer.draw()

	while true do
		local e = {event.pull()}
		if e[1] == "touch" then
			local objectFound = false
			for elementIndex = 1, #contextMenuObject.elements do
				if e[3] >= contextMenuObject.x and e[3] <= contextMenuObject.x + contextMenuObject.width - 1 and e[4] == contextMenuObject.y + elementIndex - 1 then
					objectFound = true
					if not contextMenuObject.elements[elementIndex].disabled and contextMenuObject.elements[elementIndex].type == GUI.contextMenuElementTypes.default then
						drawContextMenuElement(contextMenuObject, elementIndex, true)
						buffer.draw()
						os.sleep(0.2)
						quit()
						return contextMenuObject.elements[elementIndex].text
					end
					break
				end
			end

			if not objectFound then quit(); return end
		end
	end
end

local function addContextMenuElement(contextMenuObject, text, disabled, shortcut, color)
	local element = {}
	element.type = GUI.contextMenuElementTypes.default
	element.text = text
	element.disabled = disabled
	element.shortcut = shortcut
	element.color = color or GUI.colors.contextMenu.default.text --OPTIMIZATION

	table.insert(contextMenuObject.elements, element)
	return element
end

local function addContextMenuSeparator(contextMenuObject)
	local element = {type = GUI.contextMenuElementTypes.separator}
	table.insert(contextMenuObject.elements, element)
	return element
end

function GUI.contextMenu(x, y, ...)
	local argumentElements = {...}

	local contextMenuObject = GUI.object(x, y, 1, 1)
	contextMenuObject.elements = {}
	contextMenuObject.addElement = addContextMenuElement
	contextMenuObject.addSeparator = addContextMenuSeparator
	contextMenuObject.show = showContextMenu
	contextMenuObject.selectedElement = nil

	for elementIndex = 1, #argumentElements do
		if argumentElements[elementIndex] == "-" then
			contextMenuObject:addSeparator()
		else
			contextMenuObject:addElement(argumentElements[elementIndex][1], argumentElements[elementIndex][2], argumentElements[elementIndex][3], argumentElements[elementIndex][4])
		end
	end

	return contextMenuObject
end

----------------------------------------- Menu -----------------------------------------

function GUI.menu(x, y, width, backgroundColor, textColor, backgroundPressedColor, textPressedColor, backgroundTransparency, ...)
	local elements = {...}
	local menuObject = GUI.container(x, y, width, 1)
	menuObject:addPanel("backgroundPanel", 1, 1, menuObject.width, 1, backgroundColor, backgroundTransparency).disableClicking = true

	local x = 2
	for elementIndex = 1, #elements do
		local button = menuObject:addAdaptiveButton(elementIndex, x, 1, 1, 0, nil, elements[elementIndex][2] or textColor, elements[elementIndex][3] or backgroundPressedColor, elements[elementIndex][4] or textPressedColor, elements[elementIndex][1])
		button.type = GUI.objectTypes.menuElement
		x = x + button.width
	end

	return menuObject
end

----------------------------------------- ProgressBar Object -----------------------------------------

local function drawProgressBar(object)
	local activeWidth = math.floor(object.value * object.width / 100)
	if object.thin then
		buffer.text(object.x, object.y, object.colors.passive, string.rep("━", object.width))
		buffer.text(object.x, object.y, object.colors.active, string.rep("━", activeWidth))
	else
		buffer.square(object.x, object.y, object.width, object.height, object.colors.passive)
		buffer.square(object.x, object.y, activeWidth, object.height, object.colors.active)
	end

	if object.showValue then
		local stringValue = tostring((object.valuePrefix or "") .. object.value .. (object.valuePostfix or ""))
		buffer.text(math.floor(object.x + object.width / 2 - unicode.len(stringValue) / 2), object.y + 1, object.colors.value, stringValue)
	end

	return object
end

function GUI.progressBar(x, y, width, activeColor, passiveColor, valueColor, value, thin, showValue, valuePrefix, valuePostfix)
	local object = GUI.object(x, y, width, 1)
	object.value = value
	object.colors = {active = activeColor, passive = passiveColor, value = valueColor}
	object.thin = thin
	object.draw = drawProgressBar
	object.showValue = showValue
	object.valuePrefix = valuePrefix
	object.valuePostfix = valuePostfix
	return object
end

----------------------------------------- Other GUI elements -----------------------------------------

function GUI.windowShadow(x, y, width, height, transparency, thin)
	transparency = transparency or 50
	if thin then
		buffer.square(x + width, y + 1, 1, height - 1, 0x000000, 0x000000, " ", transparency)
		buffer.text(x + 1, y + height, 0x000000, string.rep("▀", width), transparency)
		buffer.text(x + width, y, 0x000000, "▄", transparency)
	else
		buffer.square(x + width, y + 1, 2, height, 0x000000, 0x000000, " ", transparency)
		buffer.square(x + 2, y + height, width - 2, 1, 0x000000, 0x000000, " ", transparency)
	end
end

------------------------------------------------- Окна -------------------------------------------------------------------

-- Красивое окошко для отображения сообщения об ошибке. Аргумент errorWindowParameters может принимать следующие значения:
-- local errorWindowParameters = {
--   backgroundColor = 0x262626,
--   textColor = 0xFFFFFF,
--   truncate = 50,
--   title = {color = 0xFF8888, text = "Ошибочка"}
--   noAnimation = true,
-- }
function GUI.error(text, errorWindowParameters)
	--Всякие константы, бла-бла
	local backgroundColor = (errorWindowParameters and errorWindowParameters.backgroundColor) or 0x1b1b1b
	local errorPixMap = {
		{{0xffdb40       , 0xffffff,"#"}, {0xffdb40       , 0xffffff, "#"}, {backgroundColor, 0xffdb40, "▟"}, {backgroundColor, 0xffdb40, "▙"}, {0xffdb40       , 0xffffff, "#"}, {0xffdb40       , 0xffffff, "#"}},
		{{0xffdb40       , 0xffffff,"#"}, {backgroundColor, 0xffdb40, "▟"}, {0xffdb40       , 0xffffff, " "}, {0xffdb40       , 0xffffff, " "}, {backgroundColor, 0xffdb40, "▙"}, {0xffdb40       , 0xffffff, "#"}},
		{{backgroundColor, 0xffdb40,"▟"}, {0xffdb40       , 0xffffff, "c"}, {0xffdb40       , 0xffffff, "y"}, {0xffdb40       , 0xffffff, "k"}, {0xffdb40       , 0xffffff, "a"}, {backgroundColor, 0xffdb40, "▙"}},
	}
	local textColor = (errorWindowParameters and errorWindowParameters.textColor) or 0xFFFFFF
	local buttonWidth = 12
	local verticalOffset = 2
	local minimumHeight = verticalOffset * 2 + #errorPixMap
	local height = 0
	local widthOfText = math.floor(buffer.screen.width * 0.5)

	--Ебемся с текстом, делаем его пиздатым во всех смыслах
	if type(text) ~= "table" then
		text = tostring(text)
		text = (errorWindowParameters and errorWindowParameters.truncate) and unicode.sub(text, 1, errorWindowParameters.truncate) or text
		text = { text }
	end
	text = string.wrap(text, widthOfText)


	--Ебашим высоту правильнуюe
	height = verticalOffset * 2 + #text + 1
	if errorWindowParameters and errorWindowParameters.title then height = height + 2 end
	if height < minimumHeight then height = minimumHeight end

	--Ебашим стартовые коорды отрисовки
	local x, y = math.ceil(buffer.screen.width / 2 - widthOfText / 2), math.ceil(buffer.screen.height / 2 - height / 2)
	local OKButton = {}
	local oldPixels = buffer.copy(1, y, buffer.screen.width, height)

	--Отрисовочка
	local function draw()
		local yPos = y
		--Подложка
		buffer.square(1, yPos, buffer.screen.width, height, backgroundColor, 0x000000); yPos = yPos + verticalOffset
		buffer.customImage(x - #errorPixMap[1] - 3, yPos, errorPixMap)
		--Титл, епта!
		if errorWindowParameters and errorWindowParameters.title then buffer.text(x, yPos, errorWindowParameters.title.color, errorWindowParameters.title.text); yPos = yPos + 2 end
		--Текстус
		for i = 1, #text do buffer.text(x, yPos, textColor, text[i]); yPos = yPos + 1 end; yPos = yPos + 1
		--Кнопачка
		OKButton = GUI.button(x + widthOfText - buttonWidth, y + height - 2, buttonWidth, 1, 0x3392FF, 0xFFFFFF, 0xFFFFFF, 0x262626, "OK"):draw()
		--Атрисовачка
		buffer.draw()
	end

	--Графонистый выход
	local function quit()
		OKButton:pressAndRelease(0.2)
		buffer.paste(1, y, oldPixels)
		buffer.draw()
	end

	--Онимацыя
	if not (errorWindowParameters and errorWindowParameters.noAnimation) then for i = 1, height do buffer.setDrawLimit(1, math.floor(buffer.screen.height / 2) - i, buffer.screen.width, i * 2); draw(); os.sleep(0.05) end; buffer.resetDrawLimit() end
	draw()

	--Анализ говнища
	while true do
		local e = {event.pull()}
		if e[1] == "key_down" then
			if e[4] == 28 then
				quit(); return
			end
		elseif e[1] == "touch" then
			if OKButton:isClicked(e[3], e[4]) then
				quit(); return
			end
		end
	end
end

----------------------------------------- Universal keyboard-input function -----------------------------------------

local function findValue(t, whatToSearch)
	if type(t) ~= "table" then return end
	for key, value in pairs(t) do
		if type(key) == "string" and string.match(key, "^" .. whatToSearch) then
			local valueType, postfix = type(value), ""
			if valueType == "function" or (valueType == "table" and getmetatable(value) and getmetatable(value).__call) then
				postfix = "()"
			elseif valueType == "table" then
				postfix = "."
			end
			return key .. postfix
		end
	end
end

local function findTable(whereToSearch, t, whatToSearch)
	local beforeFirstDot = string.match(whereToSearch, "^[^%.]+%.")
	-- Если вообще есть таблица, где надо искать
	if beforeFirstDot then
		beforeFirstDot = unicode.sub(beforeFirstDot, 1, -2)
		if t[beforeFirstDot] then
			return findTable(unicode.sub(whereToSearch, unicode.len(beforeFirstDot) + 2, -1), t[beforeFirstDot], whatToSearch)
		else
			-- Кароч, слушай суда: вот в эту зону хуйня может зайти толька
			-- тагда, кагда ты вручную ебенишь массив вида "abc.cda.blabla.test"
			-- без автозаполнения, т.е. он МОЖЕТ быть неверным, однако прога все
			-- равно проверяет на верность, и вот если НИ ХУЯ такого говнища типа 
			-- ... .blabla не существует, то интерхпретатор захуяривается СУДЫ
			-- И ЧТОБ БОЛЬШЕ ВОПРОСОВ НЕ ЗАДАВАЛ!11!
		end
	-- Или если таблиц либо ваще нету, либо рекурсия суда вон вошла
	else
		return findValue(t[whereToSearch], whatToSearch)
	end
end

local function autocompleteVariables(sourceText)
	local varPath = string.match(sourceText, "[a-zA-Z0-9%.%_]+$")
	if varPath then
		local prefix = string.sub(sourceText, 1, -unicode.len(varPath) - 1)
		local whereToSearch = string.match(varPath, "[a-zA-Z0-9%.%_]+%.")
		
		if whereToSearch then
			whereToSearch = unicode.sub(whereToSearch, 1, -2)
			local findedTable = findTable(whereToSearch, _G, unicode.sub(varPath, unicode.len(whereToSearch) + 2, -1))
			return findedTable and prefix .. whereToSearch .. "." .. findedTable or sourceText
		else
			local findedValue = findValue(_G, varPath)
			return findedValue and prefix .. findedValue or sourceText
		end
	else
		return sourceText
	end
end

-- local inputProperties = {
-- 	--Метод, получающий на вход текущий текст и проверяющий вводимые данные. В случае успеха должен возвращать true
-- 	validator = function(text) if string.match(text, "^%d+$") then return true end
-- 	-- Автоматически очищает текстовое поле при начале ввода информации в него.
-- 	-- Если при окончании ввода тексет не будет соответствовать методу validator, указанному выше,
-- 	-- то будет возвращено исходное значение текста (не очищенное)
-- 	eraseTextWhenInputBegins = true
-- 	--Отключает символ многоточия при выходе за пределы текстового поля
-- 	disableDots = true,
-- 	--Попросту отрисовывает всю необходимую информацию без активации нажатия на клавиши
-- 	justDrawNotEvent = true,
-- 	--Задержка между миганимем курсора
-- 	cursorBlinkDelay = 1.5,
-- 	--Цвет курсора
-- 	cursorColor = 0xFF7777,
-- 	--Символ, используемый для отрисовки курсора
-- 	cursorSymbol = "▌",
-- 	--Символ-маскировщик, на который будет визуально заменен весь вводимый текст. Полезно для полей ввода пароля
-- 	maskTextWithSymbol = "*",
-- 	--Активация подсветки Lua-синтаксиса
-- 	highlightLuaSyntax = true,
-- 	-- Активация автозаполнения названий переменных по нажатию клавиши Tab
-- 	autocompleteVariables = true,
-- }

function GUI.input(x, y, width, foreground, startText, inputProperties)
	inputProperties = inputProperties or {}
	if not (y >= buffer.drawLimit.y and y <= buffer.drawLimit.y2) then return startText end

	local text = startText
	if not inputProperties.justDrawNotEvent and inputProperties.eraseTextWhenInputBegins then text = "" end
	local textLength = unicode.len(text)
	local cursorBlinkState = false
	local cursorBlinkDelay = inputProperties.cursorBlinkDelay and inputProperties.cursorBlinkDelay or 0.5
	local cursorColor = inputProperties.cursorColor and inputProperties.cursorColor or 0x00A8FF
	local cursorSymbol = inputProperties.cursorSymbol and inputProperties.cursorSymbol or "┃"
	
	local oldPixels = {}; for i = x, x + width - 1 do table.insert(oldPixels, { buffer.get(i, y) }) end

	local function drawOldPixels()
		for i = 1, #oldPixels do buffer.set(x + i - 1, y, oldPixels[i][1], oldPixels[i][2], oldPixels[i][3]) end
	end

	local function getTextLength()
		textLength = unicode.len(text)
	end

	local function textFormat()
		local formattedText = text

		if inputProperties.maskTextWithSymbol then
			formattedText = string.rep(inputProperties.maskTextWithSymbol or "*", textLength)
		end

		if textLength > width then
			if inputProperties.disableDots then
				formattedText = unicode.sub(formattedText, -width, -1)
			else
				formattedText = "…" .. unicode.sub(formattedText, -width + 1, -1)
			end
		end

		return formattedText
	end

	local function draw()
		drawOldPixels()
		if inputProperties.highlightLuaSyntax then
			require("syntax").highlightString(x, y, textFormat(), 1, width)
		else
			buffer.text(x, y, foreground, textFormat())
		end

		if cursorBlinkState then
			local cursorPosition = textLength < width and x + textLength or x + width - 1
			local bg = buffer.get(cursorPosition, y)
			buffer.set(cursorPosition, y, bg, cursorColor, cursorSymbol)
		end

		if not inputProperties.justDrawNotEvent then buffer.draw() end
	end

	local function backspace()
		if unicode.len(text) > 0 then text = unicode.sub(text, 1, -2); getTextLength(); draw() end
	end

	local function quit()
		cursorBlinkState = false
		if inputProperties.validator and not inputProperties.validator(text) then
			text = startText
			draw()
			return startText
		end
		draw()
		return text
	end

	draw()

	if inputProperties.justDrawNotEvent then return startText end

	while true do
		local e = { event.pull(cursorBlinkDelay) }
		if e[1] == "key_down" then
			if e[4] == 14 then
				backspace()
			elseif e[4] == 28 then
				return quit()
			elseif e[4] == 15 then
				if inputProperties.autocompleteVariables then
					text = autocompleteVariables(text); getTextLength(); draw()
				end
			else
				local symbol = unicode.char(e[3])
				if not keyboard.isControl(e[3]) then
					text = text .. symbol
					getTextLength()
					draw()
				end
			end
		elseif e[1] == "clipboard" then
			text = text .. e[3]
			getTextLength()
			draw()
		elseif e[1] == "touch" then
			return quit()
		else
			cursorBlinkState = not cursorBlinkState
			draw()
		end
	end
end

----------------------------------------- Input Text Box object -----------------------------------------

local function drawInputTextBox(object, isFocused)
	local background = isFocused and object.colors.focused.background or object.colors.default.background
	local foreground = isFocused and object.colors.focused.text or object.colors.default.text
	local y = math.floor(object.y + object.height / 2)
	local text = isFocused and (object.text or "") or (object.text or object.placeholderText or "")

	if background then buffer.square(object.x, object.y, object.width, object.height, background, foreground, " ") end
	local resultText = GUI.input(object.x + 1, y, object.width - 2, foreground, text, {
		justDrawNotEvent = not isFocused,
		highlightLuaSyntax = isFocused and object.highlightLuaSyntax or nil,
		autocompleteVariables = object.autocompleteVariables or nil,
		maskTextWithSymbol = object.textMask or nil,
		validator = object.validator or nil,
		eraseTextWhenInputBegins = object.eraseTextOnFocus or nil,
	})
	object.text = isFocused and resultText or object.text
end

local function inputTextBoxBeginInput(object)
	drawInputTextBox(object, true)
	if object.text == "" then object.text = nil; drawInputTextBox(object, false); buffer.draw() end
end

function GUI.inputTextBox(x, y, width, height, inputTextBoxColor, textColor, inputTextBoxFocusedColor, textFocusedColor, text, placeholderText, maskTextWithSymbol, eraseTextOnFocus)
	local object = GUI.object(x, y, width, height)
	object.colors = {
		default = {
			background = inputTextBoxColor,
			text = textColor
		},
		focused = {
			background = inputTextBoxFocusedColor,
			text = textFocusedColor
		}
	}
	object.text = text
	object.placeholderText = placeholderText
	object.isClicked = isObjectClicked
	object.draw = drawInputTextBox
	object.input = inputTextBoxBeginInput
	object.eraseTextOnFocus = eraseTextOnFocus
	object.textMask = maskTextWithSymbol
	return object
end

----------------------------------------- Text Box object -----------------------------------------

local function drawTextBox(object)
	if object.colors.background then buffer.square(object.x, object.y, object.width, object.height, object.colors.background, object.colors.text, " ") end
	local xPos, yPos = GUI.getAlignmentCoordinates(object, {width = 1, height = object.height - object.offset.vertical * 2})
	local lineLimit = object.width - object.offset.horizontal * 2
	for line = object.currentLine, object.currentLine + object.height - 1 do
		if object.lines[line] then
			local lineType, text, textColor = type(object.lines[line])
			if lineType == "table" then
				text, textColor = string.limit(object.lines[line].text, lineLimit), object.lines[line].color
			elseif lineType == "string" then
				text, textColor = string.limit(object.lines[line], lineLimit), object.colors.text
			else
				error("Unknown TextBox line type: " .. tostring(lineType))
			end

			xPos = GUI.getAlignmentCoordinates(
				{
					x = object.x + object.offset.horizontal,
					y = object.y + object.offset.vertical,
					width = object.width - object.offset.horizontal * 2,
					height = object.height - object.offset.vertical * 2,
					alignment = object.alignment
				},
				{width = unicode.len(text), height = object.height}
			)
			buffer.text(xPos, yPos, textColor, text)
			yPos = yPos + 1
		else
			break
		end
	end

	return object
end

local function scrollDownTextBox(object, count)
	count = count or 1
	local maxCountAvailableToScroll = #object.lines - object.height - object.currentLine + 1
	count = math.min(count, maxCountAvailableToScroll)
	if #object.lines >= object.height and object.currentLine < #object.lines - count then
		object.currentLine = object.currentLine + count
	end
	return object
end

local function scrollUpTextBox(object, count)
	count = count or 1
	if object.currentLine > count and object.currentLine >= 1 then object.currentLine = object.currentLine - count end
	return object
end

local function scrollToStartTextBox(object)
	object.currentLine = 1
	return object
end

local function scrollToEndTextBox(object)
	object.currentLine = #lines
	return object
end

function GUI.textBox(x, y, width, height, backgroundColor, textColor, lines, currentLine, horizontalOffset, verticalOffset)
	local object = GUI.object(x, y, width, height)
	object.colors = { text = textColor, background = backgroundColor }
	object.setAlignment = GUI.setAlignment
	object:setAlignment(GUI.alignment.horizontal.left, GUI.alignment.vertical.top)
	object.lines = lines
	object.currentLine = currentLine or 1
	object.draw = drawTextBox
	object.scrollUp = scrollUpTextBox
	object.scrollDown = scrollDownTextBox
	object.scrollToStart = scrollToStartTextBox
	object.scrollToEnd = scrollToEndTextBox
	object.offset = {horizontal = horizontalOffset or 0, vertical = verticalOffset or 0}

	return object
end

----------------------------------------- Horizontal Slider Object -----------------------------------------

local function drawHorizontalSlider(object)
	-- На всякий случай делаем значение не меньше минимального и не больше максимального
	object.value = math.min(math.max(object.value, object.minimumValue), object.maximumValue)

	-- Отображаем максимальное и минимальное значение, если требуется
	if object.showMaximumAndMinimumValues then
		local stringMaximumValue, stringMinimumValue = tostring(object.roundValues and math.floor(object.maximumValue) or math.roundToDecimalPlaces(object.maximumValue, 2)), tostring(object.roundValues and math.floor(object.maximumValue) or math.roundToDecimalPlaces(object.minimumValue, 2))
		buffer.text(object.x - unicode.len(stringMinimumValue) - 1, object.y, object.colors.value, stringMinimumValue)
		buffer.text(object.x + object.width + 1, object.y, object.colors.value, stringMaximumValue)
	end

	-- А еще текущее значение рисуем, если хочется нам
	if object.currentValuePrefix or object.currentValuePostfix then
		local stringCurrentValue = (object.currentValuePrefix or "") .. (object.roundValues and math.floor(object.value) or math.roundToDecimalPlaces(object.value, 2)) .. (object.currentValuePostfix or "")
		buffer.text(math.floor(object.x + object.width / 2 - unicode.len(stringCurrentValue) / 2), object.y + 1, object.colors.value, stringCurrentValue)
	end

	-- Рисуем сам слайдер
	local activeWidth = math.floor(object.width - ((object.maximumValue - object.value) * object.width / (object.maximumValue - object.minimumValue)))
	buffer.text(object.x, object.y, object.colors.passive, string.rep("━", object.width))
	buffer.text(object.x, object.y, object.colors.active, string.rep("━", activeWidth))
	buffer.square(object.x + activeWidth - 1, object.y, 2, 1, object.colors.pipe, 0x000000, " ")

	return object
end

function GUI.horizontalSlider(x, y, width, activeColor, passiveColor, pipeColor, valueColor, minimumValue, maximumValue, value, showMaximumAndMinimumValues, currentValuePrefix, currentValuePostfix)
	local object = GUI.object(x, y, width, 1)
	object.colors = {active = activeColor, passive = passiveColor, pipe = pipeColor, value = valueColor}
	object.draw = drawHorizontalSlider
	object.minimumValue = minimumValue
	object.maximumValue = maximumValue
	object.value = value
	object.showMaximumAndMinimumValues = showMaximumAndMinimumValues
	object.currentValuePrefix = currentValuePrefix
	object.currentValuePostfix = currentValuePostfix
	object.roundValues = false
	return object
end

----------------------------------------- Switch object -----------------------------------------

local function drawSwitch(object)
	local pipeWidth = object.height * 2
	local pipePosition, backgroundColor
	if object.state then pipePosition, backgroundColor = object.x + object.width - pipeWidth, object.colors.active else pipePosition, backgroundColor = object.x, object.colors.passive end
	buffer.square(object.x, object.y, object.width, object.height, backgroundColor, 0x000000, " ")
	buffer.square(pipePosition, object.y, pipeWidth, object.height, object.colors.pipe, 0x000000, " ")
	return object
end

function GUI.switch(x, y, width, activeColor, passiveColor, pipeColor, state)
	local object = GUI.object(x, y, width, 1)
	object.colors = {active = activeColor, passive = passiveColor, pipe = pipeColor, value = valueColor}
	object.draw = drawSwitch
	object.state = state or false
	return object
end

--------------------------------------------------------------------------------------------------------------------------------

-- buffer.clear(0x1b1b1b)
-- buffer.draw(true)

-- GUI.switch(2, 2, 8, 0x77FF77, 0x999999, 0xFFFFFF, true):draw()

-- buffer.draw()

--------------------------------------------------------------------------------------------------------------------------------

return GUI