print-host

print("Beta version of printer hosting made by 1lann")

local modemPresent = false

for k,v in pairs(rs.getSides()) do
    if peripheral.getType(v) == "modem" then
        modemPresent = true
        rednet.open(v)
        break
    end
end

if not modemPresent then print("No modem found") error() end

local printerPresent = false
local printerMount = nil

for k,v in pairs(rs.getSides()) do
    if peripheral.getType(v) == "printer" then
        printerPresent = true
        printerMount = v
        break
    end
end

if not printerPresent then print("No printer found") error() end

local functionsAvail = {"write","setCursorPos","getCursorPos","getPageSize","newPage","endPage","getInkLevel","setPageTitle","getPaperLevel"}

local function possibleFunction(func)
    for k,v in pairs(functionsAvail) do
        if v == func then return true
        end
    end
    return false
end

print("Network printer: Ready")
print("ID: " .. os.getComputerID())
while true do
    local id,msg = rednet.receive()
    if msg == "printerConnect" then
        print("ID: ".. id .. " connected to the printer")
        rednet.send(id, "printerConnectSuccess")
    else
        local processing = textutils.unserialize(msg)
        if processing then
            if processing[1] == "callFunction" and #processing > 1 then
                if processing[2] == "setCursorPos" then
                    local response = {peripheral.call(printerMount, "setCursorPos", processing[3], processing[4])}
                    rednet.send(id, textutils.serialize(response))
                    print("ID: " .. id .. " did " .. processing[2])
                else
                    if possibleFunction(processing[2]) then
                        local response = {peripheral.call(printerMount, processing[2], processing[3], processing[4], processing[5], processing[6], processing[7])}
                        if #response == 0 then
                            rednet.send(id, "nil")
                            print("ID: " .. id .. " did " .. processing[2])
                        else
                            rednet.send(id, textutils.serialize(response))
                            print("ID: " .. id .. " did " .. processing[2])
                        end
                    else
                        print("ID: " .. id .. " did an unvalid action")
                    end
                end
            end
        end
    end
end