import { requireAuth } from '@/server/utils/auth';
import { getExpenseById } from '@/server/utils/nocodb';
import { processExpenseWithCurrency } from '@/server/utils/currency';

export default defineEventHandler(async (event) => {
  await requireAuth(event);
  
  const query = getQuery(event);
  const { id } = query;
  
  if (!id || typeof id !== 'string') {
    throw createError({
      statusCode: 400,
      statusMessage: 'Expense ID is required'
    });
  }
  
  console.log('[get-expense-by-id] Fetching expense ID:', id);
  
  try {
    const expense = await getExpenseById(id);
    
    // Process expense with currency conversion
    const processedExpense = await processExpenseWithCurrency(expense);
    
    // Transform the response to include additional computed data
    const transformedExpense = {
      ...processedExpense,
      // Format the date for easier frontend consumption
      FormattedDate: new Date(expense.Time).toLocaleDateString(),
      FormattedTime: new Date(expense.Time).toLocaleTimeString(),
      FormattedDateTime: new Date(expense.Time).toLocaleString()
    };
    
    console.log('[get-expense-by-id] Successfully fetched expense:', transformedExpense.Id);
    
    return transformedExpense;
  } catch (error: any) {
    console.error('[get-expense-by-id] Error fetching expense:', error);
    
    if (error.statusCode === 404 || error.status === 404) {
      throw createError({
        statusCode: 404,
        statusMessage: `Expense with ID ${id} not found`
      });
    }
    
    throw createError({
      statusCode: 500,
      statusMessage: 'Failed to fetch expense'
    });
  }
});