Bug Report: Incorrect Currency Calculation in Subscription Total

[AbhiramVSA]

Bug: Changing Currency while creating a new subscription leads to it applying the same arithmetic regardless of exchange rates

Bug Description

When creating a new subscription with a different currency, the application performs simple arithmetic addition without considering exchange rates, leading to incorrect total calculations.

Steps to Reproduce

1. Create a subscription with USD 10.00
2. Create another subscription with INR 10.99
3. View the total subscriptions value
4. Expected: Total should be calculated using proper exchange rates
5. Actual: Total shows 20.99 (simple addition without currency conversion)

Current Behavior

• Application adds subscription amounts directly: 10.00 + 10.99 = 20.99
• No currency conversion applied
• Totals are mathematically incorrect when multiple currencies are involved

Expected Behavior

• Convert all currencies to a base currency (e.g., USD) before calculation
• Apply real-time or cached exchange rates
• Display accurate total in the selected base currency
• Example: USD 10.00 + INR 10.99 (≈ $0.13) = $10.13

Impact

• High Priority: Financial calculations are incorrect
• Affects user trust and decision-making
• Could lead to budget miscalculations
• Multi-currency users receive wrong financial insights

Suggested Solution

1. Add currency conversion service (e.g., ExchangeRate-API, Fixer.io)
2. Implement base currency selection in user preferences
3. Convert all amounts to base currency before calculations
4. Cache exchange rates to minimize API calls
5. Display original + converted amounts for transparency

Technical Implementation

// Proposed structure
const convertToBaseCurrency = async (amount, fromCurrency, toCurrency) => {
  const rate = await getExchangeRate(fromCurrency, toCurrency);
  return amount * rate;
};

// Usage in subscription calculations
const totalInBaseCurrency = subscriptions.reduce((total, sub) => {
  const convertedAmount = convertToBaseCurrency(sub.amount, sub.currency, userBaseCurrency);
  return total + convertedAmount;
}, 0);

[Jude-00-05]

Hey Abhiram....i'm down to help you out with this issue