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|
mod types;
use std::collections::HashMap;
use std::sync::Arc;
use chrono::Utc;
use types::*;
#[tokio::main(flavor = "current_thread")]
async fn main() {
let account_repo = Arc::new(InMemoryAccountRepository::default());
// Seed a few accounts.
let cash = account_repo
.create(NewAccount {
account_type: AccountType::Asset,
name: "Cash".into(),
description: String::new(),
parent: None,
})
.await
.unwrap();
let revenue = account_repo
.create(NewAccount {
account_type: AccountType::Revenue,
name: "Sales Revenue".into(),
description: String::new(),
parent: None,
})
.await
.unwrap();
let rent = account_repo
.create(NewAccount {
account_type: AccountType::Expense,
name: "Rent Expense".into(),
description: String::new(),
parent: None,
})
.await
.unwrap();
// Post entries through the repository — it validates and checks accounts exist.
let journal_repo = InMemoryJournalEntryRepository::new(account_repo.clone());
let sale = journal_repo
.create(NewJournalEntry {
date: Utc::now(),
description: "Cash sale".into(),
postings: vec![
NewPosting {
posting_type: PostingType::Debit,
account_id: cash.id(),
amount: 500_000,
},
NewPosting {
posting_type: PostingType::Credit,
account_id: revenue.id(),
amount: 500_000,
},
],
})
.await
.unwrap();
let rent_payment = journal_repo
.create(NewJournalEntry {
date: Utc::now(),
description: "Pay office rent".into(),
postings: vec![
NewPosting {
posting_type: PostingType::Debit,
account_id: rent.id(),
amount: 200_000,
},
NewPosting {
posting_type: PostingType::Credit,
account_id: cash.id(),
amount: 200_000,
},
],
})
.await
.unwrap();
let entries = vec![sale, rent_payment];
let accounts = vec![cash, revenue, rent];
print_journal(&entries, &accounts);
println!();
print_ledger(&entries, &accounts);
}
fn account_type_name(t: &AccountType) -> &'static str {
match t {
AccountType::Asset => "Asset",
AccountType::Liability => "Liability",
AccountType::Equity => "Equity",
AccountType::Revenue => "Revenue",
AccountType::Expense => "Expense",
}
}
/// Format a whole-won amount with thousands separators.
fn group(n: u64) -> String {
let s = n.to_string();
let b = s.as_bytes();
let mut out = String::new();
for (i, c) in b.iter().enumerate() {
if i > 0 && (b.len() - i) % 3 == 0 {
out.push(',');
}
out.push(*c as char);
}
out
}
fn signed(balance: i128) -> String {
if balance < 0 {
format!("-{}", group((-balance) as u64))
} else {
group(balance as u64)
}
}
fn print_journal(entries: &[JournalEntry], accounts: &[Account]) {
let by_id: HashMap<AccountId, &Account> = accounts.iter().map(|a| (a.id(), a)).collect();
println!("JOURNAL");
println!("{}", "-".repeat(52));
for entry in entries {
println!("{} {}", entry.date.format("%Y-%m-%d"), entry.description);
for p in &entry.postings {
let name = by_id
.get(&p.account_id)
.map(|a| a.name.as_str())
.unwrap_or("<unknown>");
let (dr, cr) = match p.posting_type {
PostingType::Debit => (group(p.amount), String::new()),
PostingType::Credit => (String::new(), group(p.amount)),
};
println!(" {:<18} {:>12} {:>12}", name, dr, cr);
}
}
}
fn print_ledger(entries: &[JournalEntry], accounts: &[Account]) {
// Accumulate debit/credit totals per account.
let mut totals: HashMap<AccountId, (u64, u64)> = HashMap::new();
for entry in entries {
for p in &entry.postings {
let e = totals.entry(p.account_id).or_insert((0, 0));
match p.posting_type {
PostingType::Debit => e.0 += p.amount,
PostingType::Credit => e.1 += p.amount,
}
}
}
println!("LEDGER (KRW)");
println!("{}", "-".repeat(72));
println!(
"{:<18} {:<10} {:>12} {:>12} {:>14}",
"Account", "Type", "Debits", "Credits", "Balance"
);
println!("{}", "-".repeat(72));
let (mut total_dr, mut total_cr) = (0u64, 0u64);
for account in accounts {
let (dr, cr) = totals.get(&account.id()).copied().unwrap_or((0, 0));
total_dr += dr;
total_cr += cr;
// Balance shown on the account's normal side (debit-normal for Asset/Expense).
let balance: i128 = match &account.account_type {
AccountType::Asset | AccountType::Expense => dr as i128 - cr as i128,
_ => cr as i128 - dr as i128,
};
println!(
"{:<18} {:<10} {:>12} {:>12} {:>14}",
account.name,
account_type_name(&account.account_type),
group(dr),
group(cr),
signed(balance),
);
}
println!("{}", "-".repeat(72));
println!(
"{:<18} {:<10} {:>12} {:>12}",
"TOTAL",
"",
group(total_dr),
group(total_cr)
);
if total_dr == total_cr {
println!("\nBooks balance: debits == credits ({} KRW)", group(total_dr));
} else {
println!("\nWARNING: books do not balance");
}
}
|
