jukebox_frontend_main

-- API --------------------------------------------------

os.pullEvent = os.pullEventRaw

local w, h = term.getSize()

function printCentered(y, str)
   local x = math.floor((w - string.len(str)) / 2)
   term.setCursorPos(x, y)
   term.clearLine()
   term.write(str)
end

function printThird(y, third, str)
    local third_width = w / 3

    -- Centre position of the requested third
    local centre_x = (third - 0.5) * third_width

    local x = math.floor(centre_x - (#str / 2))

    term.setCursorPos(x, y)
    term.write(str)
end

function hasValue (tab, val)
    for index, value in ipairs(tab) do
        if value == val then
            return true
        end
    end

    return false
end

function printKeys(tab)
    -- Source - https://stackoverflow.com/a/12674376
    -- Posted by lhf
    -- Retrieved 2026-06-11, License - CC BY-SA 3.0

    local keyset={}
    local n=0

    for k,v in pairs(tab) do
        n=n+1
        keyset[n]=k
    end

    print(textutils.serialise(keyset))
end

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

JUKEBOX_ID = -1
JUKEBOX_BACKEND_ID = -1

local menu_option = 1

local function drawMenu()
    term.clear()
    term.setCursorPos(1, 1)
    term.write("Jukebox OS Alpha //")

    term.setCursorPos(w - 10, 1)
    if menu_option == 1 then
        term.write("Song List")
    elseif menu_option == 2 then
        term.write("Queue")
    elseif menu_option == 3 then
        term.write("Maintenance")
    elseif menu_option == 4 then
        term.write("Shutdown")
    end
end

local function drawFrontend()
    printCentered(math.floor(h/2) - 3, "")
    printCentered(math.floor(h/2) - 2, "Start Menu" )
    printCentered(math.floor(h/2) - 1, "")
    printCentered(math.floor(h/2) + 0, ((menu_option == 1) and "[ Song List   ]") or "Song List  ")
    printCentered(math.floor(h/2) + 1, ((menu_option == 2) and "[ Queue       ]") or "Queue      ")
    printCentered(math.floor(h/2) + 2, ((menu_option == 3) and "[ Maintenance ]") or "Maintenance")
    printCentered(math.floor(h/2) + 3, ((menu_option == 4) and "[ Shutdown    ]") or "Shutdown   ")
    printCentered(math.floor(h/2) + 4, "")
end

function main(...)
    local jukebox_id, jukebox_backend_id = ...
    JUKEBOX_ID = tonumber(jukebox_id)
    JUKEBOX_BACKEND_ID = tonumber(jukebox_backend_id)

    drawMenu()
    drawFrontend()

    while true do
        local e, p = os.pullEvent()
        if e == "key" then
            local key = p
            if key == keys.w or key == keys.up then
                if menu_option > 1 then
                    menu_option = menu_option - 1
                    drawMenu()
                    drawFrontend()
                end
            elseif key == keys.s or key == keys.down then
                if menu_option < 4 then
                    menu_option = menu_option + 1
                    drawMenu()
                    drawFrontend()
                end
            elseif key == keys.enter then
                break
            end
        end
    end

    term.clear()

    if menu_option == 1 then
        shell.run("jukebox_frontend_songlist", JUKEBOX_ID, JUKEBOX_BACKEND_ID)
    elseif menu_option == 2 then
        shell.run("jukebox_frontend_queue", JUKEBOX_ID, JUKEBOX_BACKEND_ID)
    elseif menu_option == 3 then
    elseif menu_option == 4 then
        os.shutdown()
    end
end

main(...)