os_gui

local gfx = require("gfx")
local utils = require("utils")

function createParent()
    return {isVisible = true, children = {}}
end



-- Buttons
function setAllButtonsOff(parent)
    for i = 1, #(parent["children"]) do
        local current = parent["children"][i]
        if current["type"] == "button" then
            parent["children"][i]["selected"] = false
        end
    end
end

function toggleButton(parent, buttonID)
    local data = parent["children"][buttonID]["selected"]
    parent["children"][buttonID]["selected"] = not data
end

function addCentralXButton(parent, message, posY, callback)
    local x, y = utils.midpoint(Width, Height)
    local newX = utils.getXPosOfString(message, x)
    return addButton(parent, message, newX, posY, callback)
end

function addButton(parent, message, posX, posY, callback)
    local data = {}
    data["type"] = "button"
    data["selected"] = false
    data["message"] = message
    data["posX"] = posX
    data["posY"] = posY
    data["callback"] = callback

    local lengthOfChildren = #(parent["children"])
    parent["children"][lengthOfChildren + 1] = data
    return lengthOfChildren
end



function show(parent)
    for item = 1, #(parent["children"]) do
        local current = parent["children"][item]
        if current["type"] == "button" then
            local message, posX, posY = current["message"], current["posX"], current["posY"]
            local selected = current["selected"]

            if selected then
                gfx.addText("[ " .. message .. " ]", posX - 2, posY)
            else
                gfx.addText(message, posX, posY)
            end
        end
    end
end

return {
    createParent = createParent,
    show = show,
    setAllButtonsOff = setAllButtonsOff,
    toggleButton = toggleButton,
    addButton = addButton,
    addCentralXButton = addCentralXButton
}