local appName = "SwitchFunctions"
local appVersion = "1.0"
local appAuthor = "Your Name"
local switchConfigs = {}
local MAX_ITEMS = 20
local currentForm = 1
local selectedSwitch = 1
local system = system
local json = json
local form = form
local io = io

local function saveConfigs()
    local file = io.open("/Apps/" .. appName .. "/config.json", "w")
    if file then
        io.write(file, json.encode(switchConfigs))
        io.close(file)
    end
end

local function loadConfigs()
    local file = io.open("/Apps/" .. appName .. "/config.json", "r")
    if file then
        switchConfigs = json.decode(io.read(file, "*a")) or {}
        io.close(file)
    end
end

local function addSwitchConfig()
    if #switchConfigs < MAX_ITEMS then
        table.insert(switchConfigs, {switchID = "", position = "", text = ""})
        saveConfigs()
        form.reinit()
    end
end

local function deleteSwitchConfig()
    if #switchConfigs > 0 then
        table.remove(switchConfigs, selectedSwitch)
        if selectedSwitch > #switchConfigs then
            selectedSwitch = #switchConfigs
        end
        saveConfigs()
        form.reinit()
    end
end

local function drawMainWindow()
    form.setTitle(appName)
    for i, config in ipairs(switchConfigs) do
        form.addLabel({label = config.switchID .. " " .. config.position .. " " .. config.text})
    end
end

local function drawConfigWindow()
    local config = switchConfigs[selectedSwitch]
    form.addRow(2)
    form.addLabel({label = "Switch ID", width = 220})
    form.addTextbox(config.switchID, 5, function(value) config.switchID = value end)
    
    form.addRow(2)
    form.addLabel({label = "Position", width = 220})
    form.addTextbox(config.position, 3, function(value) config.position = value end)
    
    form.addRow(2)
    form.addLabel({label = "Text", width = 220})
    form.addTextbox(config.text, 32, function(value) config.text = value end)
    saveConfigs()
end

local function checkButtons()
    if currentForm == 1 then
        form.setButton(3, ":add", #switchConfigs < MAX_ITEMS and ENABLED or DISABLED)
        form.setButton(4, ":delete", #switchConfigs > 0 and ENABLED or DISABLED)
        form.setButton(1, ":tools", ENABLED)
    else
        form.setButton(1, ":play", ENABLED)
    end
end

local function initForm(formID)
    currentForm = formID
    if formID == 1 then
        drawMainWindow()
    else
        drawConfigWindow()
    end
    checkButtons()
end

local function keyPressed(key)
    if key == KEY_5 then
        currentForm = 2
    elseif key == KEY_6 then
        deleteSwitchConfig()
    elseif key == KEY_3 then
        addSwitchConfig()
    elseif key == KEY_ESC then
        currentForm = 1
        form.reinit()
    end
							
end

local function init()
    system.registerForm(1, MENU_ADVANCED, appName, initForm, keyPressed, nil, keyPressed)
    loadConfigs()
end

return {init = init, author = appAuthor, version = appVersion, name = appName}