local levenshtein = require("levenshtein")

local pd = peripheral.find("player_detector")

if not pd then
    print("no player detector :(")
    return
end

local tk = {}

tk.plrs = {}

function tk:refreshOne(unm)
    local p = pd.getPlayerPos(unm)
    self.plrs[unm] = p or {}
end

function tk:refresh()
    self.plrs = {}

    for _, x in next, pd.getOnlinePlayers() do
        self:refreshOne(x)
    end
end

function tk:scanRange(range)
    return pd.getPlayersInRange(range)
end

function tk:resTg(tgr)
    if not tgr then return nil end

    tgr = string.lower(tgr)

    local lst, lstv = math.huge, nil

    for x, _ in next, self.plrs do
        local xl = x:lower():sub(1, #tgr)
        if xl == tgr then
            return x
        end
        -- compare if first letter matches
        if xl:sub(1, 1) == tgr:sub(1, 1) then
            local dis = levenshtein(tgr, xl)
            if dis < lst then
                lst = dis
                lstv = x
            end
        end
    end

    if lst >= 2 then
        return nil --too far
    end

    return lstv
end

return tk