jukebox_frontend_songlist

-- 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

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

local jukebox_id, jukebox_backend_id = ...

JUKEBOX_ID = tonumber(jukebox_id)
JUKEBOX_BACKEND_ID = tonumber(jukebox_backend_id)

local minecraft_songs = {}
local doctor_who_songs = {}
local other_songs = {}

local menu_option = 1

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

    term.setCursorPos(w - 16, 1)
    if menu_option == 1 then
        term.write("Minecraft Songs")
    elseif menu_option == 2 then
        term.write("Doctor Who Songs")
    elseif menu_option == 3 then
        term.write("Other Songs")
    elseif menu_option == 4 then
        term.write("Exit")
    end
end

local function drawFrontend()
    printCentered(math.floor(h/2) - 3, "")
    printCentered(math.floor(h/2) - 2, "Song List" )
    printCentered(math.floor(h/2) - 1, "")
    printCentered(math.floor(h/2) + 0, ((menu_option == 1) and "[ Minecraft Songs  ]") or "Minecraft Songs ")
    printCentered(math.floor(h/2) + 1, ((menu_option == 2) and "[ Doctor Who Songs ]") or "Doctor Who Songs")
    printCentered(math.floor(h/2) + 2, ((menu_option == 3) and "[ Other Songs      ]") or "Other Songs     ")
    printCentered(math.floor(h/2) + 3, ((menu_option == 4) and "[ Exit             ]") or "Exit            ")
    printCentered(math.floor(h/2) + 4, "")
end

local function printSongCenteredOnDash(y, song)
    local title, artist = song:match("^(.-)%s%-%s(.+)$")

    if not title then
        printCentered(y, song)
        return
    end

    local centre_x = math.floor(w / 2)

    -- Print title so it ends just before the dash
    term.setCursorPos(centre_x - #title - 1, y)
    term.write(title)

    -- Print dash
    term.setCursorPos(centre_x, y)
    term.write("-")

    -- Print artist
    term.setCursorPos(centre_x + 2, y)
    term.write(artist)
end

local function drawMinecraftSongsList()
    drawMenu()
    printCentered(3, "Minecraft Songs")

    -- Display song names
    for i, song in ipairs(minecraft_songs) do
        printSongCenteredOnDash(3 + i, song)
    end

    -- Display exit button
    printCentered(h - 1, "[ Exit ]")
end

local function drawDoctorWhoSongsList()
    drawMenu()
    printCentered(3, "Doctor Who Songs")

    -- Display song names
    for i, song in ipairs(doctor_who_songs) do
        printSongCenteredOnDash(3 + i, song)
    end

    -- Display exit button
    printCentered(h - 1, "[ Exit ]")
end

local function drawOtherSongsList()
    drawMenu()
    printCentered(3, "Other Songs")

    -- Display song names
    for i, song in ipairs(other_songs) do
        printSongCenteredOnDash(3 + i, song)
    end

    -- Display exit button
    printCentered(h - 1, "[ Exit ]")
end

local function gatherSongData()
    local song_list = fs.find("songs/*/*.json")
    for _, song_path in ipairs(song_list) do
        -- Decode data
        local song_file = fs.open(song_path, "r")
        local song_contents = song_file.readAll()
        song_file.close()

        local song_data = textutils.unserializeJSON(song_contents)
        local song_name = song_data["display_name"] .. " - " .. song_data["artist"]

        -- Add to appropriate songs list
        if fs.getDir(song_path) == "songs/minecraft" then
            minecraft_songs[#minecraft_songs + 1] = song_name
        elseif fs.getDir(song_path) == "songs/doctor_who" then
            doctor_who_songs[#doctor_who_songs + 1] = song_name
        elseif fs.getDir(song_path) == "songs/other" then
            other_songs[#other_songs + 1] = song_name
        end
    end
end

local function displaySongsListArea()
    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
        drawMinecraftSongsList()
        while true do
            local e, p = os.pullEvent()
            if e == "key" then
                local key = p
                if key == keys.enter then
                    break
                end
            end
        end
        displaySongsListArea()
    elseif menu_option == 2 then
        drawDoctorWhoSongsList()
        while true do
            local e, p = os.pullEvent()
            if e == "key" then
                local key = p
                if key == keys.enter then
                    break
                end
            end
        end
        displaySongsListArea()
    elseif menu_option == 3 then
        drawOtherSongsList()
        while true do
            local e, p = os.pullEvent()
            if e == "key" then
                local key = p
                if key == keys.enter then
                    break
                end
            end
        end
        displaySongsListArea()
    elseif menu_option == 4 then
        shell.run("jukebox_frontend", JUKEBOX_ID, JUKEBOX_BACKEND_ID)
    end
end

function main()
    gatherSongData()
    displaySongsListArea()
end

main()