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//! Zero balance assertion on balance sheet account close.
use crate::types::{DirectiveData, DirectiveWrapper, PluginInput, PluginOutput, sort_directives};
use super::super::NativePlugin;
use super::utils::increment_date;
/// Plugin that inserts zero balance assertions when balance sheet accounts are closed.
///
/// When a Close directive is encountered for an account (Assets, Liabilities, or Equity),
/// this plugin generates Balance directives with zero amounts for all currencies that
/// were used in that account. The assertions are dated one day after the close date.
pub struct CheckDrainedPlugin;
impl NativePlugin for CheckDrainedPlugin {
fn name(&self) -> &'static str {
"check_drained"
}
fn description(&self) -> &'static str {
"Zero balance assertion on balance sheet account close"
}
fn process(&self, input: PluginInput) -> PluginOutput {
use crate::types::{AmountData, BalanceData};
use std::collections::{HashMap, HashSet};
// Track currencies used per account
let mut account_currencies: HashMap<String, HashSet<String>> = HashMap::new();
// First pass: collect all currencies used per account
for wrapper in &input.directives {
match &wrapper.data {
DirectiveData::Transaction(txn) => {
for posting in &txn.postings {
if let Some(units) = &posting.units {
account_currencies
.entry(posting.account.clone())
.or_default()
.insert(units.currency.clone());
}
}
}
DirectiveData::Balance(data) => {
account_currencies
.entry(data.account.clone())
.or_default()
.insert(data.amount.currency.clone());
}
DirectiveData::Open(data) => {
// If Open has currencies, track them
for currency in &data.currencies {
account_currencies
.entry(data.account.clone())
.or_default()
.insert(currency.clone());
}
}
_ => {}
}
}
// Second pass: generate balance assertions for closed balance sheet accounts
let mut new_directives: Vec<DirectiveWrapper> = Vec::new();
for wrapper in &input.directives {
new_directives.push(wrapper.clone());
if let DirectiveData::Close(data) = &wrapper.data {
// Only generate for balance sheet accounts (Assets, Liabilities, Equity)
let is_balance_sheet = data.account.starts_with("Assets:")
|| data.account.starts_with("Liabilities:")
|| data.account.starts_with("Equity:")
|| data.account == "Assets"
|| data.account == "Liabilities"
|| data.account == "Equity";
if !is_balance_sheet {
continue;
}
// Get currencies for this account
if let Some(currencies) = account_currencies.get(&data.account) {
// Calculate the day after close
if let Some(next_date) = increment_date(&wrapper.date) {
// Generate zero balance assertion for each currency
let mut sorted_currencies: Vec<_> = currencies.iter().collect();
sorted_currencies.sort(); // Consistent ordering
for currency in sorted_currencies {
new_directives.push(DirectiveWrapper {
directive_type: "balance".to_string(),
date: next_date.clone(),
filename: None, // Plugin-generated
lineno: None,
data: DirectiveData::Balance(BalanceData {
account: data.account.clone(),
amount: AmountData {
number: "0".to_string(),
currency: currency.clone(),
},
tolerance: None,
metadata: vec![],
}),
});
}
}
}
}
}
// Sort using beancount's standard ordering
sort_directives(&mut new_directives);
PluginOutput {
directives: new_directives,
errors: Vec::new(),
}
}
}
#[cfg(test)]
mod check_drained_tests {
use super::*;
use crate::types::*;
#[test]
fn test_check_drained_adds_balance_assertion() {
let plugin = CheckDrainedPlugin;
let input = PluginInput {
directives: vec![
DirectiveWrapper {
directive_type: "open".to_string(),
date: "2024-01-01".to_string(),
filename: None,
lineno: None,
data: DirectiveData::Open(OpenData {
account: "Assets:Bank".to_string(),
currencies: vec!["USD".to_string()],
booking: None,
metadata: vec![],
}),
},
DirectiveWrapper {
directive_type: "transaction".to_string(),
date: "2024-06-15".to_string(),
filename: None,
lineno: None,
data: DirectiveData::Transaction(TransactionData {
flag: "*".to_string(),
payee: None,
narration: "Deposit".to_string(),
tags: vec![],
links: vec![],
metadata: vec![],
postings: vec![PostingData {
account: "Assets:Bank".to_string(),
units: Some(AmountData {
number: "100".to_string(),
currency: "USD".to_string(),
}),
cost: None,
price: None,
flag: None,
metadata: vec![],
}],
}),
},
DirectiveWrapper {
directive_type: "close".to_string(),
date: "2024-12-31".to_string(),
filename: None,
lineno: None,
data: DirectiveData::Close(CloseData {
account: "Assets:Bank".to_string(),
metadata: vec![],
}),
},
],
options: PluginOptions {
operating_currencies: vec!["USD".to_string()],
title: None,
},
config: None,
};
let output = plugin.process(input);
assert_eq!(output.errors.len(), 0);
// Should have 4 directives: open, transaction, close, balance
assert_eq!(output.directives.len(), 4);
// Find the balance directive
let balance = output
.directives
.iter()
.find(|d| d.directive_type == "balance")
.expect("Should have balance directive");
assert_eq!(balance.date, "2025-01-01"); // Day after close
if let DirectiveData::Balance(b) = &balance.data {
assert_eq!(b.account, "Assets:Bank");
assert_eq!(b.amount.number, "0");
assert_eq!(b.amount.currency, "USD");
} else {
panic!("Expected Balance directive");
}
}
#[test]
fn test_check_drained_ignores_income_expense() {
let plugin = CheckDrainedPlugin;
let input = PluginInput {
directives: vec![
DirectiveWrapper {
directive_type: "open".to_string(),
date: "2024-01-01".to_string(),
filename: None,
lineno: None,
data: DirectiveData::Open(OpenData {
account: "Income:Salary".to_string(),
currencies: vec!["USD".to_string()],
booking: None,
metadata: vec![],
}),
},
DirectiveWrapper {
directive_type: "close".to_string(),
date: "2024-12-31".to_string(),
filename: None,
lineno: None,
data: DirectiveData::Close(CloseData {
account: "Income:Salary".to_string(),
metadata: vec![],
}),
},
],
options: PluginOptions {
operating_currencies: vec!["USD".to_string()],
title: None,
},
config: None,
};
let output = plugin.process(input);
// Should not add balance assertions for income/expense accounts
assert_eq!(output.directives.len(), 2);
assert!(
!output
.directives
.iter()
.any(|d| d.directive_type == "balance")
);
}
#[test]
fn test_check_drained_multiple_currencies() {
let plugin = CheckDrainedPlugin;
let input = PluginInput {
directives: vec![
DirectiveWrapper {
directive_type: "open".to_string(),
date: "2024-01-01".to_string(),
filename: None,
lineno: None,
data: DirectiveData::Open(OpenData {
account: "Assets:Bank".to_string(),
currencies: vec![],
booking: None,
metadata: vec![],
}),
},
DirectiveWrapper {
directive_type: "transaction".to_string(),
date: "2024-06-15".to_string(),
filename: None,
lineno: None,
data: DirectiveData::Transaction(TransactionData {
flag: "*".to_string(),
payee: None,
narration: "USD Deposit".to_string(),
tags: vec![],
links: vec![],
metadata: vec![],
postings: vec![PostingData {
account: "Assets:Bank".to_string(),
units: Some(AmountData {
number: "100".to_string(),
currency: "USD".to_string(),
}),
cost: None,
price: None,
flag: None,
metadata: vec![],
}],
}),
},
DirectiveWrapper {
directive_type: "transaction".to_string(),
date: "2024-07-15".to_string(),
filename: None,
lineno: None,
data: DirectiveData::Transaction(TransactionData {
flag: "*".to_string(),
payee: None,
narration: "EUR Deposit".to_string(),
tags: vec![],
links: vec![],
metadata: vec![],
postings: vec![PostingData {
account: "Assets:Bank".to_string(),
units: Some(AmountData {
number: "50".to_string(),
currency: "EUR".to_string(),
}),
cost: None,
price: None,
flag: None,
metadata: vec![],
}],
}),
},
DirectiveWrapper {
directive_type: "close".to_string(),
date: "2024-12-31".to_string(),
filename: None,
lineno: None,
data: DirectiveData::Close(CloseData {
account: "Assets:Bank".to_string(),
metadata: vec![],
}),
},
],
options: PluginOptions {
operating_currencies: vec!["USD".to_string()],
title: None,
},
config: None,
};
let output = plugin.process(input);
// Should have 6 directives: open, 2 transactions, close, 2 balance assertions
assert_eq!(output.directives.len(), 6);
let balances: Vec<_> = output
.directives
.iter()
.filter(|d| d.directive_type == "balance")
.collect();
assert_eq!(balances.len(), 2);
// Both should be dated 2025-01-01
for b in &balances {
assert_eq!(b.date, "2025-01-01");
}
}
}