defmodule Util do
    @moduledoc false


    def uuid() do
        UUID.uuid4(:hex)
    end

    def random_string(length) do
        :crypto.strong_rand_bytes(length)
        |> Base.url_encode64()
        |> binary_part(0, length)
        |> String.upcase()
    end

    def random_num_string(length) do
        {a, _} = :crypto.rand_plugin_next(0)
        a
        |> :erlang.integer_to_binary
        |> binary_part(0, length)
    end

    def map_drop_key(map, keys) do
        Enum.reduce(
            keys,
            map,
            fn (h, acc) ->
                Map.delete(acc, h)
            end
        )
    end

    def iif(condition, true_result, false_result) do
        if condition do
            true_result
        else
            false_result
        end
    end

    def del_price(price) when is_binary(price)do
        case Integer.parse(price) do
            {p, _} ->
                p
            :error ->
                :error
        end
    end
    def del_price(price) do
        to_integer(price)
    end

    def to_atom(str) when is_binary(str) do
        String.to_existing_atom(str)
    end
    def to_atom(str) when is_atom(str) do
        str
    end
    def to_atom(_) do
        :error
    end

    def binary_to_list(str) when is_binary(str) do
        case Jason.decode(str) do
            {:ok, r} ->
                r
            _ ->
                :error
        end
    end
    def binary_to_list(str) do
        str
    end

    # array[integer/string,integer/string] -> string
    def list_to_binary(label)do
        {:ok, r} = Jason.encode(label)
        r
    end

    def list_ele_to_integer(str) when is_binary(str) do
        case Jason.decode(str) do
            {:ok, list} ->
                list_ele_to_integer(list)
            _ ->
                []
        end
    end
    def list_ele_to_integer(list) when is_list(list) do
        Enum.reduce(
            list,
            [],
            fn (h, acc) ->
                case Enum.member?(acc, h) do
                    true ->
                        acc
                    _ ->
                        [to_integer(h) | acc]
                end
            end
        )
    end



    def concat_cypher([h | []], acc) do
        "c.#{h} AS #{h}" <> acc
    end
    def concat_cypher([h | rest], acc) do
        concat_cypher(rest, ", c.#{h} AS #{h}" <> acc)
    end

    def to_integer(value) when is_integer(value) do
        value
    end
    def to_integer(value) when is_binary(value) do
        case Integer.parse(value) do
            {i, _} ->
                i
            err ->
                err
        end
    end
    def to_integer(value) when is_float(value) do
        to_integer(Float.to_string(value))
    end
    def to_integer(_) do
        -1
    end

    def to_string(str) when is_integer(str) do
        Integer.to_string(str)
    end
    def to_string(str) when is_float(str) do
        Float.to_string(str)
    end
    def to_string(str) do
        str
    end

    def to_float(i) when is_binary(i) do
        {f, _} = Float.parse(i)
        f
    end
    def to_float(int) do
        {f, _} = Float.parse(Util.to_string(int))
        f
    end

    def demand_time_out(1) do
        ConfigServer.key_value(:demand_time_out1)
    end
    def demand_time_out(2) do
        ConfigServer.key_value(:demand_time_out2)
    end
    def demand_time_out(3) do
        ConfigServer.key_value(:demand_time_out3)
    end
    def demand_time_out(_) do
        :error
    end

    def one_day_sec() do
        86400
    end

    def one_hour() do
        60 * 60
    end

end