local configFile = fs.open("client.cfg", "r")
local config = textutils.unserialise(configFile.readAll())
configFile.close()

rednet.open(config.modemLocation)

local Orientation = {
    NORTH = 0,
    SOUTH = 1,
    WEST = 2,
    EAST = 3
}

local startingOrientation = config.orientation
local serverID = config.serverID
local map = {}

local function connectToServer()
    rednet.send(config.serverID, {
        type = "connect"
    })

    local id,msg = rednet.receive(5)
    if msg == nil or msg.type ~= "accepted" then
        printError("Connection refused.")
        return false
    else
        print("Connected to server (" .. id .. ")")
        serverID = id
        return true
    end
end

local function clientLoop(eventData)
    local e, p1, p2, p3, p4, p5 = unpack(eventData)
    if e == "rednet_message" then
        local id, tbl = p1, p2

        if id == serverID then
            if tbl.type == "keepalive" then
                rednet.send(id, { type = "keepalive" })
            elseif tbl.type == "disconnect" then
                print("Disconnected: " .. tbl.reason)
                return false
            elseif tbl.type == "map" then
                print("Received map from server")
                map = tbl.data
            end
        else
            print("Message from unknown sender " .. id)
            rednet.send(config.serverID, {
                type = "suspicious_computer",
                id = id
            })
        end
    elseif e == "terminate" then
        rednet.send(serverID, { type = "disconnect" })
        return false
    end

    return true
end

local ok = connectToServer(config.serverID)
if not ok then return end

rednet.send(config.serverID, { type = "map" })

while true do
    local eventData = { os.pullEventRaw() }
    if not clientLoop(eventData) then break end
end