--ButtonAPI by Freack100
local x,y = term.getSize()
local buttons = {}

function draw()
    for buttonCount = 1, #buttons do
        if buttons[buttonCount]["visible"] then
            term.setCursorPos(buttons[buttonCount]["sX"],buttons[buttonCount]["sY"])
            term.setBackgroundColor(buttons[buttonCount]["bgcol"])
            term.setTextColor(buttons[buttonCount]["txtcol"])
            for i = buttons[buttonCount]["sY"], buttons[buttonCount]["eY"] do
                term.setCursorPos(buttons[buttonCount]["sX"], i)
                for u = buttons[buttonCount]["sX"], buttons[buttonCount]["eX"] do
                    term.write(" ")
                end
            end
            term.setCursorPos(((buttons[buttonCount]["sX"]+buttons[buttonCount]["eX"])/2)-(string.len(buttons[buttonCount]["txt"])/2), (buttons[buttonCount]["sY"]+buttons[buttonCount]["eY"])/2)
            term.write(buttons[buttonCount]["txt"])
        end
    end
end

function create(sX,sY,eX,eY,bgcol,txtcol,txt,func)
    buttons[#buttons+1] = {["visible"] = true,["sX"]=sX,["sY"]=sY,["eX"]=eX,["eY"]=eY,["bgcol"]=bgcol,["txtcol"]=txtcol,["txt"]=txt,["func"]=func}
    return #buttons --This is the ID
end

function changeVisibility(ID)
    if not buttons[ID] then error("No button with this ID.",2) end
    buttons[ID]["visible"] = not buttons[ID]["visible"]
end

function deleteButton(ID)
    if not buttons[ID] then error("Buttons doesn't exists.",2) end
    buttons[ID] = nil
end

function getVisibility(ID)
  if not buttons[ID] then error("Button doesn't exists.",2) end
  return buttons[ID]["visible"]
end

function waitForEvents()
    while true do
        local evt,btn,pX,pY = os.pullEvent()
        if evt == "mouse_click" then
            for i = 1, #buttons do
                if buttons[i]["visible"] then
                    if pX >= buttons[i]["sX"] and pX <= buttons[i]["eX"] and pY >= buttons[i]["sY"] and pY <= buttons[i]["eY"] then
                        buttons[i]["func"]()
                        return
                    end
                end
            end
        end
        sleep(0)
    end
end