tktax-expense

This crate provides specialized abstractions for handling business expense logic in the tktax ecosystem. By leveraging several foundational crates (e.g., tktax_3p, tktax_account, tktax_line_item, etc.), tktax-expense defines robust data structures and traits for expense categorization, financial transactions, and minimal overhead integrations with existing ledger systems.

Features

1. BusinessExpense Struct

   • Carries a TransactionCategory and an immutable reference to the corresponding Transaction.
   • Implements fmt::Display for straightforward logging and reporting.
   • Conforms to the LineItem trait, ensuring consistent treatment as a billable or deductible line item.

2. GetBusinessExpenditures Trait

   • Exposes the business_expenditures method on any Account instance.
   • Produces a vector of BusinessExpense entities after verifying if a transaction belongs to recognized business-related categories.

3. Predictive Categorization

   • The internal workflow utilizes predict_category(...) to map textual transaction descriptions to the most probable category.
   • Only transactions deemed strictly business-oriented are wrapped as BusinessExpense instances.

Example Usage

Below is a minimal illustration of how to gather business expenses from an Account. For brevity, we assume you have already defined or included the necessary structures (Account, CategoryMap, etc.) in your codebase.

fn main() -> Result<(), Box<dyn std::error::Error>> {

    // Suppose `account` is loaded from your financial records.
    // and `category_map` maps textual descriptors to business categories.

    let account: Account = /* ... obtain an Account somehow ... */;
    let category_map: CategoryMap<SomeTransactionCategoryImpl> = /* ... initialized externally ... */;

    // Gather all recognized business expenses.
    let expenses = account.business_expenditures(&category_map);

    // Display each recognized expense.
    for e in expenses.iter() {
        println!("{}", e);
    }

    Ok(())
}

Crate Design Rationale

• Generics for Category Extensibility:
  The TransactionCategory trait is kept generic, facilitating custom category taxonomies in multifaceted scenarios (e.g., domestic vs. international expenditure, professional fees, office supplies, etc.).

• Integration with Existing Ledger Systems:
  GetBusinessExpenditures is implemented for Account, enabling direct synergy with ledger data. This design sidesteps the need to replicate logic for transaction iteration or specialized extraction in user-facing code.

• Optimized Data Orchestration:
  Internally, expenses are collated, sorted, and prepared for further analytics or reporting with minimal overhead.

Contributing

Contributions, bug reports, and feature requests are welcomed at the GitHub repository.
Please adhere to best practices and ensure robust error handling throughout your submission.

License

This project is licensed under the MIT License.