fix: kucoin refacto

Signed-off-by: rodesousa <[email protected]>

lib/pex/exchange.ex

@@ -8,35 +8,35 @@ defmodule Pex.Exchange do
   """
   @callback get_balance() :: float
 
-  @doc """
-  List of coins in our portfolio
-  """
-  @callback coins_list() :: [map]
+  # @doc """
+  # List of coins in our portfolio
+  # """
+  # @callback coins_list() :: [map]
 
-  @doc """
-  List of coins whitout exchange order
-  """
-  @callback coins_list_without_exchange_order() :: [String.t()]
+  # @doc """
+  # List of coins whitout exchange order
+  # """
+  # @callback coins_list_without_exchange_order() :: [String.t()]
 
-  @doc """
-  Gets coins list without local order
-  """
-  @callback coins_list_without_trade() :: [map]
+  # @doc """
+  # Gets coins list without local order
+  # """
+  # @callback coins_list_without_trade() :: [map]
 
-  @doc """
-   Creates a trade
-  """
-  @callback create_trade(map) :: {:ok, %Pex.Data.Trade{}} | {:error, %Ecto.Changeset{}}
+  # @doc """
+  # Creates a trade
+  # """
+  # @callback create_trade(map) :: {:ok, %Pex.Data.Trade{}} | {:error, %Ecto.Changeset{}}
 
-  @doc """
-   Creates a trade with shad strategy
-  """
-  @callback create_shad(map) :: {:ok, %Pex.Data.Trade{}} | {:error, %Ecto.Changeset{}}
+  # @doc """
+  # Creates a trade with shad strategy
+  # """
+  # @callback create_shad(map) :: {:ok, %Pex.Data.Trade{}} | {:error, %Ecto.Changeset{}}
 
-  @doc """
-  Places a order market buy
-  """
-  @callback market_buy(String.t(), float, float, float) :: [map]
+  # @doc """
+  # Places a order market buy
+  # """
+  # @callback market_buy(String.t(), float, float, float) :: [map]
 
   @doc """
   Loads exchange info from fixture/filename
@@ -55,4 +55,27 @@ defmodule Pex.Exchange do
     data = Jason.encode!(data)
     File.write!("fixture/#{filename}", data)
   end
+
+  @doc """
+  Return a truncated number with the same decimal number of &2
+
+  # Examples
+
+      iex> trunc(10.945, 0.01)
+      10.94
+  """
+  @spec trunc(float, String.t()) :: float
+  def trunc(price, filter) do
+    decimal = String.to_float(filter)
+    [_a, decimal] = String.split("#{decimal}", ".")
+
+    case decimal == "0" do
+      true ->
+        trunc(price) * 1.0
+
+      false ->
+        price
+        |> Float.floor(String.length(decimal))
+    end
+  end
 end

lib/pex/risk_management.ex

@@ -52,4 +52,7 @@ defmodule Pex.RiskManagement do
       position: position
     }
   end
+
+  @doc false
+  def decrease(number), do: number * (1 - @decrease_rate)
 end