local libraries = {
	buffer = "doubleBuffering",
	ecs = "ECSAPI",
	unicode = "unicode",
	event = "event",
}

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

---------------------------------------------------- Универсальные методы --------------------------------------------------------

GUI.directions = {
	horizontal = 0,
	vertical = 1,
}

GUI.buttonTypes = {
	default = 0,
	adaptive = 1,
	framedDefault = 2,
	framedAdaptive = 3,
}

GUI.colors = {
	disabled = 0x888888,
	disabledText = 0xAAAAAA,
}

-- Универсальный метод для проверки клика на прямоугольный объект
local function objectClicked(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

local function objectSetDisabled(object, state)
	object.disabled = state
end

--Создание базового примитива-объекта
function GUI.object(x, y, width, height)
	return {
		x = x,
		y = y,
		width = width,
		height = height,
		isClicked = objectClicked,
	}
end

---------------------------------------------------- Кнопки --------------------------------------------------------------------

-- Универсальынй метод-рисоватор кнопки
local function drawButton(buttonObject, isPressed)
	local textLength = unicode.len(buttonObject.text)
	if textLength > buttonObject.width then buttonObject.text = unicode.sub(buttonObject.text, 1, buttonObject.width) end
	
	local xText = math.floor(buttonObject.x + buttonObject.width / 2 - textLength / 2)
	local yText = math.floor(buttonObject.y + buttonObject.height / 2)
	local buttonColor = buttonObject.disabled and buttonObject.colors.disabled.button or (isPressed and buttonObject.colors.pressed.button or buttonObject.colors.default.button)
	local textColor = buttonObject.disabled and buttonObject.colors.disabled.text or (isPressed and buttonObject.colors.pressed.text or buttonObject.colors.default.text)

	if buttonObject.type == GUI.buttonTypes.default or buttonObject.type == GUI.buttonTypes.adaptive then
		buffer.square(buttonObject.x, buttonObject.y, buttonObject.width, buttonObject.height, buttonColor, textColor, " ")
		buffer.text(xText, yText, textColor, buttonObject.text)
	elseif buttonObject.type == GUI.buttonTypes.framedDefault or buttonObject.type == GUI.buttonTypes.framedAdaptive then
		buffer.frame(buttonObject.x, buttonObject.y, buttonObject.width, buttonObject.height, buttonColor)
		buffer.text(xText, yText, textColor, buttonObject.text)
	end
end

-- Метод-нажиматор кнопки
local function pressButton(buttonObject, pressTime)
	drawButton(buttonObject, true)
	buffer.draw()
	os.sleep(pressTime or 0.2)
	drawButton(buttonObject, false)
	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 buttonObject = GUI.object(x, y, width, height)
	buttonObject.colors = {
		default = {
			button = buttonColor,
			text = textColor
		},
		pressed = {
			button = buttonPressedColor,
			text = textPressedColor
		},
		disabled = {
			button = GUI.colors.disabled,
			text = GUI.colors.disabledText,
		}
	}
	buttonObject.disabled = disabledState
	buttonObject.setDisabled = objectSetDisabled
	buttonObject.type = buttonType
	buttonObject.text = text
	buttonObject.press = pressButton
	buttonObject.draw = drawButton
	return buttonObject
end

-- Кнопка фиксированных размеров
function GUI.button(x, y, width, height, buttonColor, textColor, buttonPressedColor, textPressedColor, text, disabledState)
	local buttonObject = createButtonObject(GUI.buttonTypes.default, x, y, width, height, buttonColor, textColor, buttonPressedColor, textPressedColor, text, disabledState)
	buttonObject:draw()
	return buttonObject
end

-- Кнопка, подстраивающаяся под размер текста
function GUI.adaptiveButton(x, y, xOffset, yOffset, buttonColor, textColor, buttonPressedColor, textPressedColor, text, disabledState)
	local buttonObject = createButtonObject(GUI.buttonTypes.adaptive, x, y, xOffset * 2 + unicode.len(text), yOffset * 2 + 1, buttonColor, textColor, buttonPressedColor, textPressedColor, text, disabledState)
	buttonObject:draw()
	return buttonObject
end

-- Кнопка в рамке
function GUI.framedButton(x, y, width, height, buttonColor, textColor, buttonPressedColor, textPressedColor, text, disabledState)
	local buttonObject = createButtonObject(GUI.buttonTypes.framedDefault, x, y, width, height, buttonColor, textColor, buttonPressedColor, textPressedColor, text, disabledState)
	buttonObject:draw()
	return buttonObject
end

-- Кнопка в рамке, подстраивающаяся под размер текста
function GUI.adaptiveFramedButton(x, y, xOffset, yOffset, buttonColor, textColor, buttonPressedColor, textPressedColor, text, disabledState)
	local buttonObject = createButtonObject(GUI.buttonTypes.framedAdaptive, x, y, xOffset * 2 + unicode.len(text), yOffset * 2 + 1, buttonColor, textColor, buttonPressedColor, textPressedColor, text, disabledState)
	buttonObject:draw()
	return buttonObject
end

-- Вертикальный или горизонтальный ряд кнопок
-- Каждая кнопка - это массив вида {enum GUI.buttonTypes.default или GUI.buttonTypes.adaptive, int ширина/отступ, int высота/отступ, int цвет кнопки, int цвет текста, int цвет нажатой кнопки, int цвет нажатого текста, string текст}
-- Метод возвращает обычный массив кнопочных объектов (см. выше)
function GUI.buttons(x, y, direction, spaceBetweenButtons, ...)
	local buttons = {...}
	local buttonObjects = {}

	local function drawCorrectButton(i)
		if buttons[i][1] == GUI.buttonTypes.default then
			return GUI.button(x, y, buttons[i][2], buttons[i][3], buttons[i][4], buttons[i][5], buttons[i][6], buttons[i][7], buttons[i][8])
		elseif buttons[i][1] == GUI.buttonTypes.adaptive then
			return GUI.adaptiveButton(x, y, buttons[i][2], buttons[i][3], buttons[i][4], buttons[i][5], buttons[i][6], buttons[i][7], buttons[i][8])
		elseif buttons[i][1] == GUI.buttonTypes.framedDefault then
			return GUI.framedButton(x, y, buttons[i][2], buttons[i][3], buttons[i][4], buttons[i][5], buttons[i][6], buttons[i][7], buttons[i][8])
		elseif buttons[i][1] == GUI.buttonTypes.framedAdaptive then
			return GUI.adaptiveFramedButton(x, y, buttons[i][2], buttons[i][3], buttons[i][4], buttons[i][5], buttons[i][6], buttons[i][7], buttons[i][8])
		else
			error("Неподдерживаемый тип кнопки: " .. tostring(buttons[i][1]))
		end
	end

	for i = 1, #buttons do
		buttonObjects[i] = drawCorrectButton(i)
		if direction == GUI.directions.horizontal then
			x = x + buttonObjects[i].width + spaceBetweenButtons
		elseif direction == GUI.directions.vertical then
			y = y + buttonObjects[i].height + spaceBetweenButtons
		else
			error("Неподдерживаемое направление: " .. tostring(buttons[i][1]))
		end
	end

	return buttonObjects
end

function GUI.menu(x, y, width, menuColor, ...)
	local buttons = {...}
	buffer.square(x, y, width, 1, menuColor)
	x = x + 1
	local menuObjects = {}
	for i = 1, #buttons do
		menuObjects[i] = GUI.adaptiveButton(x, y, 1, 0, menuColor, buttons[i].textColor, buttons[i].buttonPressedColor or 0x3366CC, buttons[i].textPressedColor or 0xFFFFFF, buttons[i].text)
		x = x + menuObjects[i].width
	end
	return menuObjects
end

function GUI.windowActionButtons(x, y, fatSymbol)
	local symbol = fatSymbol and "⬤" or "●"
	local windowActionButtons, background = {}
	background = buffer.get(x, y); windowActionButtons.close = GUI.button(x, y, 1, 1, background, 0xFF4940, background, 0x992400, symbol); x = x + 2
	background = buffer.get(x, y); windowActionButtons.minimize = GUI.button(x, y, 1, 1, background, 0xFFB640, background, 0x996D00, symbol); x = x + 2
	background = buffer.get(x, y); windowActionButtons.maximize = GUI.button(x, y, 1, 1, background, 0x00B640, background, 0x006D40, symbol); x = x + 2
	return windowActionButtons
end

function GUI.toolbar(x, y, width, height, spaceBetweenElements, currentElement, toolbarColor, elementTextColor, activeElementColor, activeElementTextColor, ...)
	local elements, objects, elementLength, isCurrent, elementWidth = {...}, {}
	local totalWidth = 0; for i = 1, #elements do totalWidth = totalWidth + unicode.len(elements[i]) + 2 + spaceBetweenElements end; totalWidth = totalWidth - spaceBetweenElements
	buffer.square(x, y, width, height, toolbarColor)
	x = math.floor(x + width / 2 - totalWidth / 2)
	local yText = math.floor(y + height / 2)

	for i = 1, #elements do
		elementLength, isCurrent = unicode.len(elements[i]), i == currentElement 
		elementWidth = elementLength + 2
		if isCurrent then buffer.square(x, y, elementWidth, height, activeElementColor) end
		buffer.text(x + 1, yText, isCurrent and activeElementTextColor or elementTextColor, elements[i])
		table.insert(objects, GUI.object(x, y, elementWidth, height))
		x = x + elementWidth + spaceBetweenElements
	end	

	return objects
end

function GUI.progressBar(x, y, width, height, firstColor, secondColor, value, maxValue, thin)
	local percent = value / maxValue
	local activeWidth = math.floor(percent * width)
	if thin then
		buffer.text(x, y, firstColor, string.rep("━", width))
		buffer.text(x, y, secondColor, string.rep("━", activeWidth))
	else
		buffer.square(x, y, width, height, firstColor)
		buffer.square(x, y, activeWidth, height, secondColor)
	end
end

function GUI.windowShadow(x, y, width, height, transparency)
	buffer.square(x + width, y + 1, 2, height, 0x000000, 0x000000, " ", transparency)
	buffer.square(x + 2, y + height, width - 2, 1, 0x000000, 0x000000, " ", transparency)
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 ecs.stringLimit("end", text, errorWindowParameters.truncate) or text
		text = { text }
	end
	text = ecs.stringWrap(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")
		--Атрисовачка
		buffer.draw()
	end

	--Графонистый выход
	local function quit()
		OKButton:press(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

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

-- local textFieldProperties = {
-- 	--Регурярное выражение, которому должны соответствовать вводимые данные. При несоответствии на выходе из функции выдается первоначальный текст, поданынй на выход функции
-- 	regex = "^%d+$",
-- 	--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 = "*",
-- }

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

	local text = startText
	local textLength = unicode.len(text)
	local cursorBlinkState = false
	local cursorBlinkDelay = (textFieldProperties and textFieldProperties.cursorBlinkDelay) and textFieldProperties.cursorBlinkDelay or 0.5
	local cursorColor = (textFieldProperties and textFieldProperties.cursorColor) and textFieldProperties.cursorColor or 0x00A8FF
	local cursorSymbol = (textFieldProperties and textFieldProperties.cursorSymbol) and textFieldProperties.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 textFieldProperties and textFieldProperties.maskTextWithSymbol then
			formattedText = string.rep(textFieldProperties.maskTextWithSymbol or "*", textLength)
		end

		if textLength > width then
			if textFieldProperties and textFieldProperties.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()
		buffer.text(x, y, foreground, textFormat())

		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 (textFieldProperties and textFieldProperties.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 textFieldProperties and textFieldProperties.regex and not string.match(text, textFieldProperties.regex) then
			text = startText
			draw()
			return startText
		end
		draw()
		return text
	end

	draw()

	if textFieldProperties and textFieldProperties.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()
			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

local function drawTextField(object, isFocused)
	if not object.invisible then
		local background = object.disabled and object.colors.disabled.textField or (isFocused and object.colors.focused.textField or object.colors.default.textField)
		local foreground = object.disabled and object.colors.disabled.text or (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})
		object.text = isFocused and resultText or object.text
	end
end

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

function GUI.textField(x, y, width, height, textFieldColor, textColor, textFieldFocusedColor, textFocusedColor, text, placeholderText, disabledState, invisibleState)
	local object = GUI.object(x, y, width, height)
	object.invisible = invisibleState
	object.disabled = disabledState
	object.colors = {
		default = {
			textField = textFieldColor,
			text = textColor
		},
		focused = {
			textField = textFieldFocusedColor,
			text = textFocusedColor
		},
		disabled = {
			textField = GUI.colors.disabled,
			text = GUI.colors.disabledText,
		}
	}
	object.text = text
	object.placeholderText = placeholderText
	object.isClicked = objectClicked
	object.draw = drawTextField
	object.input = textFieldBeginInput
	object:draw()
	return object
end

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


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

return GUI