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 -- LemonOS: Pocket Shell for Lemonphone
 -- by ChatGPT (GPT-5)
 -- Features: Persistent settings, live clock, distance-based signal bars, auto-netchat install
 
 -- ===== CONFIG PATHS =====
 local CONFIG_PATH = "/lemonos.cfg"
 local NETCHAT_PATH = "/netchat"
 local STARTUP_PATH = "/startup.lua"
 
 -- ===== FIRMWARE INFO =====
 local firmware = {
     device = "Lemonphone",
     version = "LemonOS 2.0"
 }
 
 -- ===== SETTINGS =====
 local config = {
     username = "User",
     accentColor = colors.yellow,
     bgColor = colors.black,
     rednetSide = "back"
 }
 
 -- ===== CONFIG LOAD/SAVE =====
 local function saveConfig()
     local file = fs.open(CONFIG_PATH, "w")
     if file then
         file.write(textutils.serialize(config))
         file.close()
     end
 end
 
 local function loadConfig()
     if fs.exists(CONFIG_PATH) then
         local file = fs.open(CONFIG_PATH, "r")
         if file then
             local data = file.readAll()
             file.close()
             local ok, tbl = pcall(textutils.unserialize, data)
             if ok and type(tbl) == "table" then
                 for k, v in pairs(tbl) do config[k] = v end
             end
         end
     end
 end
 loadConfig()
 
 -- ===== AUTO-DOWNLOAD NETCHAT =====
 if not fs.exists(NETCHAT_PATH) then
     print("Downloading netchat...")
     if http then
         local ok, resp = pcall(http.get, "https://pastebin.com/raw/KeRK2UWE")
         if ok and resp then
             local content = resp.readAll()
             resp.close()
             local file = fs.open(NETCHAT_PATH, "w")
             file.write(content)
             file.close()
             print("netchat installed!")
         else
             print("Failed to download netchat.")
         end
     else
         print("HTTP API not enabled.")
     end
     -- set startup to run firm.lpsw
     local file = fs.open(STARTUP_PATH, "w")
     file.write('shell.run("firm.lpsw")')
     file.close()
 end
 
 -- ===== INITIALIZE REDNET =====
 if peripheral.find("modem") then
     rednet.open(config.rednetSide)
 else
     rednet.close(config.rednetSide)
 end
 
 -- ===== GLOBAL SIGNAL VARIABLE =====
 local signalStrength = 0 -- 1–3 bars
 
 -- ===== UTILITIES =====
 local function centerText(y, text, color)
     local w = term.getSize()
     local x = math.floor((w - #text) / 2)
     term.setCursorPos(x, y)
     if color then term.setTextColor(color) end
     term.write(text)
     term.setTextColor(colors.white)
 end
 
 -- Map distance to signal bars
 local function distanceToBars(distance)
     if distance <= 5 then
         return 3
     elseif distance <= 20 then
         return 2
     else
         return 1
     end
 end
 
 -- ===== ASYNC SIGNAL UPDATER =====
 local function updateSignal()
     while true do
         local strength = 0
         if rednet.isOpen(config.rednetSide) then
             local peers = {}
             local ids = rednet.lookup("lemonphone_ping") or {}
             for _, id in ipairs(ids) do
                 local ok = pcall(rednet.send, id, "ping", 0.1)
                 if ok then
                     local d = math.abs(os.getComputerID() - id) -- simple heuristic for distance
                     table.insert(peers, d)
                 end
             end
             if #peers > 0 then
                 table.sort(peers)
                 strength = distanceToBars(peers[1])
             end
         end
         signalStrength = strength
         sleep(5)
     end
 end
 
 -- Draw signal bars based on latest value
 local function drawSignalBars()
     local barChar = "|"
     local maxBars = 3
     for i = 1, maxBars do
         if i <= signalStrength then
             term.setTextColor(colors.lime)
         else
             term.setTextColor(colors.gray)
         end
         term.write(barChar)
     end
     term.setTextColor(colors.white)
 end
 
 -- ===== TOP BAR =====
 local function drawTopBar()
     local w = term.getSize()
     term.setCursorPos(1,1)
     term.setBackgroundColor(config.accentColor)
     term.clearLine()
 
     -- Left: signal
     term.setCursorPos(2,1)
     if rednet.isOpen(config.rednetSide) then
         drawSignalBars()
         term.write(" Net")
     else
         term.setTextColor(colors.red)
         term.write("X NoNet")
         term.setTextColor(colors.black)
     end
 
     -- Right: time/date
     local timeStr = textutils.formatTime(os.time(), true)
     local dateStr = os.date("%b %d")
     local clock = timeStr .. " | " .. dateStr
     term.setCursorPos(w - #clock - 1, 1)
     term.setTextColor(colors.black)
     term.write(clock)
 end
 
 -- ===== MENU =====
 local function drawMenu(selected)
     local apps = {
         {name="Messages", cmd="netchat"},
         {name="Worm", cmd="worm"},
         {name="Falling Blocks", cmd="falling"},
 		{name="Redirection", cmd="redirection"},
         {name="Settings", cmd="settings"},
         {name="About Lemonphone", cmd="about"},
         {name="Shutdown", cmd="shutdown"}
     }
 
     local startY = 4
     term.setTextColor(colors.white)
     for i, app in ipairs(apps) do
         term.setCursorPos(4, startY + i - 1)
         if i == selected then
             term.setBackgroundColor(colors.gray)
             term.setTextColor(colors.black)
         else
             term.setBackgroundColor(config.bgColor)
             term.setTextColor(colors.white)
         end
         term.clearLine()
         term.setCursorPos(4, startY + i - 1)
         term.write(app.name)
     end
 
     term.setBackgroundColor(config.bgColor)
     return apps
 end
 
 -- ===== SETTINGS MENU =====
 local function openSettings()
     while true do
         term.setBackgroundColor(config.bgColor)
         term.clear()
         centerText(3, "Settings", config.accentColor)
         term.setCursorPos(2,5)
         term.write("1. Change Username")
         term.setCursorPos(2,6)
         term.write("2. Change Accent Color")
         term.setCursorPos(2,7)
         term.write("3. Back")
 
         local _, key = os.pullEvent("key")
         if key == keys.one then
             term.setCursorPos(2,9)
             term.clearLine()
             term.write("Enter new username: ")
             config.username = read()
             saveConfig()
         elseif key == keys.two then
             term.setCursorPos(2,9)
             term.clearLine()
             term.write("Color name (e.g. yellow): ")
             local colorName = read()
             if colors[colorName] then
                 config.accentColor = colors[colorName]
                 saveConfig()
             else
                 term.setCursorPos(2,10)
                 term.write("Invalid color.")
                 sleep(1)
             end
         elseif key == keys.three then
             return
         end
     end
 end
 
 -- ===== ABOUT PAGE =====
 local function aboutLemonphone()
     term.setBackgroundColor(config.bgColor)
     term.clear()
     centerText(3,"About Lemonphone", config.accentColor)
     term.setCursorPos(2,5)
     term.write("Device: " .. firmware.device)
     term.setCursorPos(2,6)
     term.write("Firmware: " .. firmware.version)
     term.setCursorPos(2,8)
     term.write("Press any key to return...")
     os.pullEvent("key")
 end
 
 -- ===== MAIN LOOP =====
 local function mainLoop()
     local selected = 1
     local refreshRate = 1.0
     local timer = os.startTimer(refreshRate)
 
     while true do
         term.setBackgroundColor(config.bgColor)
         term.clear()
         drawTopBar()
         centerText(3, config.username .. "'s Lemonphone", config.accentColor)
         local apps = drawMenu(selected)
 
         local event, key = os.pullEvent()
         if event == "key" then
             if key == keys.up then selected = math.max(1, selected-1)
             elseif key == keys.down then selected = math.min(#apps, selected+1)
             elseif key == keys.enter then
                 local chosen = apps[selected]
                 if chosen.name == "Settings" then openSettings()
                 elseif chosen.name == "About Lemonphone" then aboutLemonphone()
                 else
                     term.setBackgroundColor(config.bgColor)
                     term.clear()
                     term.setCursorPos(1,1)
                     shell.run(chosen.cmd)
                 end
             end
         elseif event == "timer" then
             timer = os.startTimer(refreshRate)
             drawTopBar()
         end
     end
 end
 
 -- ===== START SIGNAL UPDATER IN PARALLEL WITH MAIN LOOP =====
 parallel.waitForAny(updateSignal, mainLoop)