-- Function to open the modem on the target computer
local function openModem()
    local modemSide
    for _, side in ipairs(rs.getSides()) do
        if peripheral.getType(side) == "modem" then
            modemSide = side
            break
        end
    end

    if modemSide and not rednet.isOpen(modemSide) then
        rednet.open(modemSide)
        print("Modem opened on side: " .. modemSide)
    end
end

-- Function to receive a file from the source computer
local function receiveFile(targetPath, contents)
    local file = fs.open(targetPath, "w")
    if file then
        file.write(contents)
        file.close()
        print("Received file: " .. targetPath)
    else
        print("Error: Unable to save file " .. targetPath)
    end
end

-- Main function to handle file transfer
local function main()
    openModem()

    -- Main loop to listen for incoming files
    while true do
        local senderID, message, protocol = rednet.receive("fileTransfer")
        -- Check if the message is a file transfer request
        if type(message) == "table" and #message == 2 then
            local targetPath = message[1]
            local contents = message[2]
            receiveFile(targetPath, contents)
        end
    end
end

-- Execute the main function
main()