From 00a100f6187c569d698a60a6e3de09ef71c9e3d3 Mon Sep 17 00:00:00 2001
From: Giulio De Pasquale <giulio@depasquale.eu>
Date: Mon, 21 Dec 2020 12:00:33 +0000
Subject: [PATCH] added method to calculate maximum order amount

---
 bfxbot/bfxwrapper.py | 33 ++++++++++++++++++++++++++++++---
 1 file changed, 30 insertions(+), 3 deletions(-)

diff --git a/bfxbot/bfxwrapper.py b/bfxbot/bfxwrapper.py
index 1f1d373..73ed159 100644
--- a/bfxbot/bfxwrapper.py
+++ b/bfxbot/bfxwrapper.py
@@ -1,13 +1,29 @@
+from enum import Enum
+
 from bfxapi.rest.bfx_rest import BfxRest
 from retrying_async import retry
 
 from bfxbot.currency import Symbol
 
 
+class Direction(Enum):
+    UP = 1,
+    DOWN = -1
+
+
+class OrderType(Enum):
+    EXCHANGE = "EXCHANGE",
+    MARGIN = "MARGIN"
+
+
 class BfxWrapper(BfxRest):
     def __init__(self, api_key: str, api_secret: str):
         super().__init__(API_KEY=api_key, API_SECRET=api_secret)
 
+    #######################################
+    # OVERRIDDEN METHODS TO IMPLEMENT RETRY
+    #######################################
+
     @retry()
     async def get_public_ticker(self, symbol):
         if isinstance(symbol, Symbol):
@@ -33,6 +49,14 @@ class BfxWrapper(BfxRest):
 
         return await super().get_trades(symbol, start, end)
 
+    @retry()
+    async def post(self, api_path: str, data: dict):
+        return await super.post(api_path, data)
+
+    ################################
+    # NEW METHODS
+    ################################
+
     async def get_current_prices(self, symbol) -> (float, float, float):
         if isinstance(symbol, Symbol):
             symbol = str(symbol)
@@ -59,7 +83,10 @@ class BfxWrapper(BfxRest):
 
         return balance
 
-    async def get_balance_delta(self, symbol: Symbol, start: float, end: float):
-        trades = await self.get_trades(symbol, start, end)
+    async def maximum_order_amount(self, symbol: Symbol, direction: Direction,
+                                   order_type: OrderType = OrderType.EXCHANGE,
+                                   rate: int = 1):
+        api_path = "auth/calc/order/avail"
 
-        return sum([t.amount for t in trades])
+        return await self.post(api_path,
+                               {'symbol': str(symbol), 'type': order_type.value, "dir": direction.value, "rate": rate})