Button

Point = {}

Point.new = function(x, y)
    -- Private
    local self = {}
    local X = x or 0
    local Y = y or 0

    -- Get/Set
    self.x = function(x)
        X = x or X
        return X
    end
    self.y = function(y)
        Y = y or Y
        return Y
    end

    return self
end

Button = {}

Button.new = function(pos, size, text, color, callback)
    -- Private Variables
    local self = {}
    local Pos = pos or Point.new(0,0)
    local Size = size or Point.new(0,0)
    local Text = text or ""
    local Color = color or colors.gray
    local callback = callback or function() end

    -- Get/Set
    self.pos = function(pos)
        Pos = pos or Pos
        return Pos
    end
    self.size = function(size)
        Size = size or Size
        return Size
    end
    self.text = function(text)
        Text = text or Text
        return Text
    end
    self.color = function(color)
        Color = color or Color
        return Color
    end
    self.callback = function(callback)
        Callback = callback or Callback
        return Callback
    end

    -- Methods
    self.render = function(monitor)
        local lineCount = 0
        local lines = {}
        for line in string.gmatch(Text, "[^%|]+") do
           lineCount = lineCount + 1
           lines[lineCount] = line
        end

        local textPos = {}
        textPos.empty = true
        for i = 1, lineCount do
            textPos.empty = false
            local textX = Pos.x() + math.floor((Size.x() - string.len(lines[i]))/2)
            local textY = Pos.y() + math.floor((Size.y() - lineCount)/2) + i - 1
            if textX < Pos.x() then
                textX = Pos.x()
            end
            textPos[i] = Point.new(textX, textY)
        end

        monitor.setBackgroundColor(Color)

        local curLine = 1
        monitor.setCursorPos(Pos.x(), Pos.y())
        local x, y = monitor.getCursorPos()
        while not (x == Pos.x() and y == Pos.y() + Size.y()) do
            if textPos.empty or curLine > lineCount then
                monitor.write(" ")
            elseif textPos[curLine].y() == y and textPos[curLine].x() ==  x then
                monitor.write(lines[curLine])
                curLine = curLine + 1
            else
                monitor.write(" ")
            end

            x, y = monitor.getCursorPos()
            if x > Pos.x() + Size.x() - 1 then
                x = Pos.x()
                y = y + 1
                monitor.setCursorPos(x, y)
            end
        end
    end
    self.isClicked = function(click)
        if Pos.x() <= click.x() and Pos.x() + Size.x() >= click.x() then
            if Pos.y() <= click.y() and Pos.y() + Size.y() >= click.y() then
                return true
            end
        end
        return false
    end

    return self
end