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use crate::models::{budget_update::BudgetUpdate, category::Category};
use super::{calculate_budgets_accrual, find_by_id_or};
pub fn calculate_category_balance(
category: &Category,
transaction_sums: &[(i32, Option<i64>)],
category_transfer_from_sums: &[(i32, Option<i64>)],
category_transfer_to_sums: &[(i32, Option<i64>)],
budget_updates: &[BudgetUpdate],
) -> i64 {
let transaction_sum = find_by_id_or(transaction_sums, category.id, 0);
let category_transfer_from_sum = find_by_id_or(category_transfer_from_sums, category.id, 0);
let category_transfer_to_sum = find_by_id_or(category_transfer_to_sums, category.id, 0);
let budget_accruals_sum = calculate_budgets_accrual(category, budget_updates);
transaction_sum + budget_accruals_sum + category_transfer_to_sum - category_transfer_from_sum
}
#[cfg(test)]
mod test {
use chrono::{Days, Utc};
use crate::{
models::{budget_update::BudgetUpdate, category::Category, date_time_utc::DateTimeUtc},
utils::calculate_category_balance,
};
#[test]
fn when_no_data_then_returns_zero() {
let category = Category {
id: 0,
name: String::new(),
};
let result = calculate_category_balance(&category, &[], &[], &[], &[]);
assert_eq!(result, 0_i64);
}
#[test]
fn when_data_only_for_another_category_then_returns_zero() {
let category = Category {
id: 0,
name: String::new(),
};
let transaction_sums = [(1, Some(100))];
let category_transfer_from_sums = [(1, Some(91))];
let category_transfer_to_sums = [(2, Some(79))];
let budget_updates = [BudgetUpdate {
id: 0,
category_id: 1,
date: DateTimeUtc::new(Utc::now().checked_sub_days(Days::new(120)).unwrap()),
new_budget: 77,
new_period: 1,
}];
let result = calculate_category_balance(
&category,
&transaction_sums,
&category_transfer_from_sums,
&category_transfer_to_sums,
&budget_updates,
);
assert_eq!(result, 0_i64);
}
#[test]
fn when_transaction_sum_is_none_then_returns_zero() {
let category = Category {
id: 0,
name: String::new(),
};
let transaction_sums = [(0, None)];
let category_transfer_from_sums = [];
let category_transfer_to_sums = [];
let budget_updates = [];
let result = calculate_category_balance(
&category,
&transaction_sums,
&category_transfer_from_sums,
&category_transfer_to_sums,
&budget_updates,
);
assert_eq!(result, 0_i64);
}
#[test]
fn when_category_transfers_are_none_then_returns_zero() {
let category = Category {
id: 0,
name: String::new(),
};
let transaction_sums = [];
let category_transfer_from_sums = [(0, None)];
let category_transfer_to_sums = [(0, None)];
let budget_updates = [];
let result = calculate_category_balance(
&category,
&transaction_sums,
&category_transfer_from_sums,
&category_transfer_to_sums,
&budget_updates,
);
assert_eq!(result, 0_i64);
}
#[test]
fn when_some_data_then_calculates_as_expected() {
let category = Category {
id: 0,
name: String::new(),
};
let transaction_sums = [(0, Some(100))];
let category_transfer_from_sums = [(0, Some(91))];
let category_transfer_to_sums = [(0, Some(79))];
let budget_updates = [BudgetUpdate {
id: 0,
category_id: 0,
date: DateTimeUtc::new(Utc::now().checked_sub_days(Days::new(120)).unwrap()),
new_budget: 77,
new_period: 1,
}];
let result = calculate_category_balance(
&category,
&transaction_sums,
&category_transfer_from_sums,
&category_transfer_to_sums,
&budget_updates,
);
let expected_result = 100 + (-91) + 79 + 77 * 120;
assert_eq!(result, expected_result);
}
}
|
