initial commit

2021-01-07 22:12:05 +01:00
commit e385650802
51 changed files with 1048 additions and 0 deletions
@@ -0,0 +1,90 @@
+from django.db import connection
+from apps.transactions.models import Transaction
+from apps.rates.models import ExchangeRate
+from decimal import Decimal
+import datetime
+
+class Calc:
+  def ShowDiffRate(self, DayDiff, CurrentRate, Crypto, Fiat):
+    with connection.cursor() as cursor:
+        sql = """SELECT rate, datetime_valid FROM exchangerate WHERE crypto_currency = %s AND fiat_currency = %s
+           AND datetime_valid BETWEEN %s AND %s
+           ORDER BY datetime_valid DESC"""
+        startDate = datetime.datetime.now() - datetime.timedelta(days=int(DayDiff))
+        endDate = startDate + datetime.timedelta(days=1)
+        cursor.execute(sql, [Crypto, Fiat, startDate, endDate])
+        rateMinusXDay = cursor.fetchone()
+        if rateMinusXDay:
+            return {"dateRelative": "%s days ago" % (DayDiff,), "date" : rateMinusXDay[1], "rateEUR": rateMinusXDay[0],
+                "diffPercentage": (CurrentRate.rate-Decimal(rateMinusXDay[0]))/Decimal(rateMinusXDay[0])*100, "rateUSD": None}
+    return None
+
+  def GetCurrentValue(self, userid, crypto, total_investment, current_value, total_tax_free):
+    amount_kept = 0
+    out = {}
+    out["crypto"] = crypto
+
+    with connection.cursor() as cursor:
+        sql = """SELECT SUM(amount_after_fee) as after_fee, SUM(amount) as amount FROM `transaction` WHERE amount >= 0 and crypto_currency=%s and owner_id=%s"""
+        cursor.execute(sql, [crypto, userid])
+        bought = cursor.fetchone()
+        if bought[1]:
+          out["bought"] = bought[1]
+          total_investment += Decimal(bought[1])
+          amount_kept += Decimal(bought[0])
+        else:
+          out["bought"] = None
+    
+    with connection.cursor() as cursor:
+        sql = """SELECT SUM(amount_before_fee) as before_fee, SUM(amount) as amount FROM `transaction` WHERE amount < 0 and crypto_currency=%s and owner_id=%s"""
+        cursor.execute(sql, [crypto, userid])
+        sold = cursor.fetchone()
+        if sold[1]:
+          out["sold"] = sold[1]
+          total_investment += Decimal(sold[1])
+          amount_kept += Decimal(sold[0])
+        else:
+          out["sold"] = None
+
+    rateEUR = ExchangeRate.objects.filter(crypto_currency=crypto, fiat_currency='EUR').order_by('-datetime_valid').first()
+    rateUSD = ExchangeRate.objects.filter(crypto_currency=crypto, fiat_currency='USD').order_by('-datetime_valid').first()
+
+    if rateEUR:
+      cv =  Decimal(rateEUR.rate) * amount_kept
+      current_value += cv
+      out["current_value"] = cv
+      out["amount_kept"] = amount_kept
+      out["rateEUR"] = rateEUR.rate
+    else:
+      out["current_value"] = None
+      out["amount_kept"] = None
+      out["rateEUR"] = None
+
+    out["rates"] = []
+    if rateUSD and rateEUR:
+        out["rates"].append({"dateRelative": "Now", "date" : rateEUR.datetime_valid, "rateEUR": rateEUR.rate, "diffPercentage": None, "rateUSD": rateUSD.rate})
+
+    if rateEUR:
+      for daydiff in ["1", "3", "7", "14", "30"]:
+        diffrate = self.ShowDiffRate(daydiff, rateEUR, crypto, 'EUR')
+        if diffrate:
+          out["rates"].append(diffrate)
+
+    amount_within_past_year = 0
+    with connection.cursor() as cursor:
+        sql = """SELECT SUM(amount_after_fee) as amount FROM `transaction` WHERE amount > 0 and crypto_currency=%s and owner_id=%s and date_valid>%s"""
+        cursor.execute(sql, [crypto, userid, datetime.datetime.now() - datetime.timedelta(days=365)])
+        bought = cursor.fetchone()
+        out["bought_recently"] = None
+        if bought[0]:
+          out["bought_recently"] = bought[0]
+          amount_within_past_year = Decimal(bought[0])
+        amount_available_to_sell = amount_kept - amount_within_past_year
+        out["bought_tax_free"] = None
+        out["value_tax_free"] = None
+        if rateEUR:
+          out["bought_tax_free"] = amount_available_to_sell
+          out["value_tax_free"] = amount_available_to_sell * rateEUR.rate
+          total_tax_free += out["value_tax_free"]
+
+    return (total_investment, current_value, total_tax_free, rateEUR.rate, rateUSD.rate, out)