-- Wireless Keyboard Receiver (Host Side)

-- Find modem automatically
local modemSide = nil
for _, side in ipairs(redstone.getSides()) do
    if peripheral.isPresent(side) and peripheral.getType(side) == "modem" then
        modemSide = side
        break
    end
end

if not modemSide then
    print("Error: No modem found!")
    return
end

rednet.open(modemSide)
term.clear()
term.setCursorPos(1, 1)
print("=== Wireless Keyboard Receiver ===")
print("Ready. Waiting for input...")
print("---------------------------------")

local inputBuffer = ""
local currentLine = 4

local function refreshInput()
    term.setCursorPos(1, currentLine)
    term.clearLine()
    write("> " .. inputBuffer)
end

refreshInput()

while true do
    local senderID, msg = rednet.receive()
    
    if type(msg) == "string" then
        if msg == "\b" then
            -- Handle backspace
            if #inputBuffer > 0 then
                inputBuffer = inputBuffer:sub(1, -2)
            end
        elseif msg == "\n" then
            -- Handle enter: run command
            term.setCursorPos(1, currentLine + 1)
            shell.run(inputBuffer)
            inputBuffer = ""
            currentLine = select(2, term.getCursorPos()) + 1
            
            -- Auto scroll when reach bottom
            local _, screenH = term.getSize()
            if currentLine >= screenH then
                term.scroll(1)
                currentLine = screenH - 1
            end
        else
            -- Add normal character
            inputBuffer = inputBuffer .. msg
        end
        refreshInput()
    end
end