-- Path of Building
--
-- Class: DropDown Control
-- Basic drop down control.
--

local DropDownClass = common.NewClass("DropDownControl", function(self, x, y, width, height, list, selFunc, enableFunc)
	self.x = x
	self.y = y
	self.width = width
	self.height = height
	self.list = list or { }
	self.sel = 1
	self.selFunc = selFunc
	self.enableFunc = enableFunc
end)

function DropDownClass:SelByValue(val)
	for index, listVal in ipairs(self.list) do
		if listVal == val then
			self.sel = index
			return
		end
	end
end

function DropDownClass:IsMouseOver()
	if self.hidden then
		return false
	end
	local x = type(self.x) == "function" and self:x() or self.x
	local y = type(self.y) == "function" and self:y() or self.y
	local cx, cy = GetCursorPos()
	local dropExtra = self.dropped and (self.height - 4) * #self.list + 2 or 0
	return cx >= x and cy >= y and cx < x + self.width and cy < y + self.height + dropExtra, cy < y + self.height
end

function DropDownClass:Draw()
	if self.hidden then
		return false
	end
	local x = type(self.x) == "function" and self:x() or self.x
	local y = type(self.y) == "function" and self:y() or self.y
	local enabled = not self.enableFunc or self.enableFunc()
	local mOver, mOverBody = self:IsMouseOver()
	local dropExtra = (self.height - 4) * #self.list + 4
	if not enabled then
		SetDrawColor(0.33, 0.33, 0.33)
	elseif mOver or self.dropped then
		SetDrawColor(1, 1, 1)
	else
		SetDrawColor(0.5, 0.5, 0.5)
	end
	DrawImage(nil, x, y, self.width, self.height)
	if self.dropped then
		DrawImage(nil, x, y + self.height, self.width, dropExtra)
	end
	if not enabled then
		SetDrawColor(0, 0, 0)
	elseif self.dropped then
		SetDrawColor(0.5, 0.5, 0.5)
	elseif mOver then
		SetDrawColor(0.33, 0.33, 0.33)
	else
		SetDrawColor(0, 0, 0)
	end
	DrawImage(nil, x + 1, y + 1, self.width - 2, self.height - 2)
	if not enabled then
		SetDrawColor(0.33, 0.33, 0.33)
	elseif mOver or self.dropped then
		SetDrawColor(1, 1, 1)
	else
		SetDrawColor(0.5, 0.5, 0.5)
	end
	local x1 = x + self.width - self.height / 2 - self.height / 4
	local x2 = x1 + self.height / 2
	local y1 = y + self.height / 4
	local y2 = y1 + self.height / 2
	DrawImageQuad(nil, x1, y1, x2, y1, (x1+x2)/2, y2, (x1+x2)/2, y2)
	if self.dropped then
		SetDrawColor(0, 0, 0)
		DrawImage(nil, x + 1, y + self.height + 1, self.width - 2, dropExtra - 2)
	end
	if enabled then
		SetDrawColor(1, 1, 1)
	else
		SetDrawColor(0.66, 0.66, 0.66)
	end
	DrawString(x + 2, y + 2, "LEFT", self.height - 4, "VAR", self.list[self.sel] or "")
	if self.dropped then
		self.hoverSel = mOver and math.floor((select(2,GetCursorPos()) - y - self.height) / (self.height - 4)) + 1
		if self.hoverSel and self.hoverSel < 1 then
			self.hoverSel = nil
		end
		for index, val in ipairs(self.list) do
			local y = y + self.height + 2 + (index - 1) * (self.height - 4)
			if index == self.hoverSel then
				SetDrawColor(0.5, 0.4, 0.3)
				DrawImage(nil, x + 2, y, self.width - 4, self.height - 4)
			end
			if index == self.hoverSel or index == self.sel then
				SetDrawColor(1, 1, 1)
			else
				SetDrawColor(0.66, 0.66, 0.66)
			end
			DrawString(x + 2, y, "LEFT", self.height - 4, "VAR", StripEscapes(val))
		end
	end
end

function DropDownClass:OnKeyDown(key)
	if self.enableFunc and not self.enableFunc() then
		return true
	end
	if key == "LEFTBUTTON" then
		local all, body = self:IsMouseOver()
		if not all or (self.dropped and body) then
			self.dropped = false
			return true
		end
		self.dropped = true
		return false
	elseif key == "ESCAPE" then
		self.dropped = false
		return true
	end
	return false
end

function DropDownClass:OnKeyUp(key)
	if self.enableFunc and not self.enableFunc() then
		return true
	end
	if key == "LEFTBUTTON" then
		local all, body = self:IsMouseOver()
		if not all then
			self.dropped = false
			return true
		elseif not body then
			local y = type(self.y) == "function" and self:y() or self.y
			local sel = math.max(1, math.floor((select(2,GetCursorPos()) - y - self.height) / (self.height - 4)) + 1)
			self.sel = sel
			if self.selFunc then
				self.selFunc(sel, self.list[sel])
			end
			self.dropped = false
			return true
		end
	end
	return false
end