Upload st.py

st.py

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+import streamlit as st
+import pandas as pd
+from transformers import AutoTokenizer, AutoModelForTableQuestionAnswering
+
+class InterestCalculatorApp:
+    def __init__(self):
+        self.invoices_df = None
+        self.base_rates_df = None
+        self.late_payment_interest = st.sidebar.slider("Late Payment Interest Rate (%)", min_value=0.0, max_value=10.0, value=4.0)
+        self.compounding_method = st.sidebar.selectbox("Compounding Method", ["x% above Base Rate (daily)", 
+                                                                            "x% above Base Rate (annually)",
+                                                                             "Quarterly compounding (25 Mar, 24 Jun, 29 Sep, 25 Dec)",
+                                                                             "Quarterly compounding (1 Mar, 1 Jun, 1 Sep, 1 Dec)"])
+
+        # Load TAPAS model
+        self.tokenizer = AutoTokenizer.from_pretrained("google/tapas-large-finetuned-wtq")
+        self.model = AutoModelForTableQuestionAnswering.from_pretrained("google/tapas-large-finetuned-wtq")
+
+    def load_invoices(self, file_path):
+        try:
+            self.invoices_df = pd.read_excel(file_path, parse_dates=['Due Date'])
+            st.success("Invoices loaded successfully.")
+        except Exception as e:
+            st.error(f"Failed to load invoices: {e}")
+
+    def calculate_interest(self):
+        if self.invoices_df is not None and self.base_rates_df is not None:
+            st.write("Calculating interest...")
+            today = datetime.today()
+            interests = []
+            for index, invoice in self.invoices_df.iterrows():
+                due_date = invoice['Due Date']
+                amount = invoice['Amount']
+                base_rate = self.get_base_rate(due_date)
+                effective_rate = base_rate + self.late_payment_interest
+                if due_date > today:
+                    interests.append(0)
+                    continue
+                interest = self.calculate_compound_interest(due_date, amount, effective_rate, self.compounding_method, today)
+                interests.append(interest)
+                total_amount_owed = amount + interest
+                self.invoices_df.loc[index, 'Interest'] = interest
+                self.invoices_df.loc[index, 'Total Amount Owed'] = total_amount_owed
+            total_interest = sum(interests)
+            st.success(f"Total Interest Calculated: £{total_interest:.2f}")
+            st.write(self.invoices_df)
+        else:
+            st.error("Please load both invoices and base rates files.")
+
+    def get_base_rate(self, due_date):
+        self.base_rates_df['Date Changed'] = pd.to_datetime(self.base_rates_df['Date Changed'])
+        rate_rows = self.base_rates_df[self.base_rates_df['Date Changed'] <= due_date].sort_values(by='Date Changed', ascending=False)
+        return rate_rows.iloc[0]['Rate'] if not rate_rows.empty else 0
+
+    def calculate_compound_interest(self, due_date, amount, effective_rate, method, today):
+        days = (today - due_date).days
+        if 'daily' in method:
+            daily_rate = (effective_rate / 100) / 365
+            return amount * daily_rate * days
+        elif 'annually' in method:
+            annual_rate = effective_rate / 100
+            return amount * annual_rate * (days / 365)
+        elif 'Quarterly compounding' in method:
+            return self.calculate_quarterly_interest(due_date, amount, effective_rate, method, today)
+
+    def calculate_quarterly_interest(self, due_date, amount, effective_rate, method, today):
+        quarterly_dates = {
+            "Quarterly compounding (25 Mar, 24 Jun, 29 Sep, 25 Dec)": [(3, 25), (6, 24), (9, 29), (12, 25)],
+            "Quarterly compounding (1 Mar, 1 Jun, 1 Sep, 1 Dec)": [(3, 1), (6, 1), (9, 1), (12, 1)]
+        }[method]
+        interest = 0
+        compounded_amount = amount
+        for month, day in quarterly_dates:
+            compounding_date = datetime(today.year, month, day)
+            if compounding_date > today:
+                break
+            if compounding_date > due_date:
+                days_since_last_compounding = (today - compounding_date).days
+                period_rate = effective_rate / 4  # Quarterly rate
+                compounded_interest = compounded_amount * ((1 + period_rate) ** (days_since_last_compounding / 365.25) - 1)
+                compounded_amount += compounded_interest
+                interest += compounded_interest
+                due_date = compounding_date
+        return interest
+
+    def download_boe_rates(self):
+        try:
+            headers = {
+                'accept-language': 'en-US,en;q=0.9',
+                'User-Agent': 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/109.0.0.0 Safari/537.36'
+            }
+            url = 'https://www.bankofengland.co.uk/boeapps/database/Bank-Rate.asp'
+            response = requests.get(url, headers=headers)
+            if response.status_code == 200:
+                df = pd.read_html(response.text)[0]
+                df.to_csv('boe_rates.csv', index=False)
+                self.base_rates_df = df
+                self.base_rates_df['Date Changed'] = pd.to_datetime(self.base_rates_df['Date Changed'], format='%d %b %y')
+                st.success("Bank of England rates downloaded successfully.")
+            else:
+                st.error("Failed to retrieve data from the Bank of England website.")
+        except requests.RequestException as e:
+            st.error(f"Failed to download rates: {e}")
+
+    def ask_tapas(self, query, table):
+        inputs = self.tokenizer(table, query, return_tensors="pt", padding=True)
+        outputs = self.model(**inputs)
+        predicted_answer = self.tokenizer.decode(outputs.logits.argmax(dim=-1))
+        return predicted_answer
+
+def main():
+    st.title("Interest Calculation App")
+
+    app = InterestCalculatorApp()
+
+    file_path = st.file_uploader("Upload Invoices File", type=["xlsx"])
+
+    if file_path is not None:
+        app.load_invoices(file_path)
+
+    if st.button("Calculate Interest"):
+        app.calculate_interest()
+
+    app.download_boe_rates()
+
+if __name__ == "__main__":
+    main()