pp = require("cc.pretty")

local filename = "tobuild"
rednet.open("left")
function stringtovec(str)
    parts = {}
    for part in string.gmatch(str, "([^,]+)") do
        table.insert(parts,tonumber(part))
    end
    return vector.new(unpack(parts))
end

while true do
    id, message, protocol = rednet.receive()
    if protocol == "getnexttobuild" then
        if message then
            file = fs.open(
                filename,
                "r"
            )
            lines = {}
            vec = stringtovec(message)
            print(vector.new().tostring(vec))
            record = nil
            repeat
                line = file.readLine()
                wec = (line and stringtovec(line)) or nil
                adding = wec
                if 
                    (wec)
                and (
                        (not record) 
                    or 
                        (wec.y <= record.y)
                ) 
                then
                    if 
                        (not record) 
                    or 
                        (
                            (vec-wec):length() 
                            < 
                            (vec-record):length()
                        ) 
                    then
                        --pp.pretty_print(wec)
                        --write("is better than")
                        --pp.pretty_print(record)
                        adding = record
                        record = wec
                    end
                end
                if adding then
                    table.insert(lines,adding:tostring())
                end
            until not line
            rednet.send(id,record:tostring(),"nexttobuild")
            print(record)
            file.close()
            file = fs.open(filename,"w")
            for i,v in pairs(lines) do
                file.writeLine(v)
            end
            file.close()
            
        else
            file = fs.open(filename,"r")
            line = file.readLine()
            restof = file.readAll()
            file.close()
            file = fs.open(filename,"w")
            file.write(restof)
            file.close()
            print(line)
            rednet.send(id,line,"nexttobuild")
        end
    elseif protocol == "failedtobuild" then
        print(message.."failed")
        file = fs.open(filename,"r")
        restof = file.readAll()
        file.close()
        file = fs.open(filename,"w")
        file.writeLine(message)
        file.write(restof)
        file.close()
    end
    --file = fs.open(filename,"r")
    --print(file.readAll())
end